Merge branch 'master' into cli-rpc

.gitlab-ci.yml

@@ -231,10 +231,10 @@ linux-armv6:
   stage: build
   image: ethcore/rust-armv6:latest
   only:
-#    - beta
+    - beta
 #    - tags
 #    - stable
-    - triggers
+#    - triggers
   script:
     - export CC=arm-linux-gnueabi-gcc
     - export CXX=arm-linux-gnueabi-g++
@@ -312,8 +312,8 @@ darwin:
     - stable
     - triggers
   script:
-    - cargo build -j 8 --release -p ethstore #$CARGOFLAGS
     - cargo build -j 8 --release #$CARGOFLAGS
+    - cargo build -j 8 --release -p ethstore #$CARGOFLAGS
     - rm -rf parity.md5
     - md5sum target/release/parity > parity.md5
     - packagesbuild -v mac/Parity.pkgproj
@@ -350,7 +350,7 @@ windows:
     - set RUST_BACKTRACE=1
     - set RUSTFLAGS=%RUSTFLAGS%
     - rustup default stable-x86_64-pc-windows-msvc
-    - cargo build -j 8 --release #%CARGOFLAGS%
+    - cargo build --release #%CARGOFLAGS%
     - curl -sL --url "https://github.com/ethcore/win-build/raw/master/SimpleFC.dll" -o nsis\SimpleFC.dll
     - curl -sL --url "https://github.com/ethcore/win-build/raw/master/vc_redist.x64.exe" -o nsis\vc_redist.x64.exe
     - signtool sign /f %keyfile% /p %certpass% target\release\parity.exe
@@ -408,7 +408,7 @@ test-darwin:
 test-windows:
   stage: test
   only:
-    - triggers
+#    - triggers
   before_script:
     - git submodule update --init --recursive
   script:

Cargo.lock

@@ -3,6 +3,7 @@ name = "parity"
 version = "1.5.0"
 dependencies = [
  "ansi_term 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_dirs 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "clippy 0.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
  "ctrlc 1.1.1 (git+https://github.com/ethcore/rust-ctrlc.git)",
  "daemonize 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -44,7 +45,7 @@ dependencies = [
  "serde_json 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -60,6 +61,17 @@ name = "ansi_term"
 version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "app_dirs"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ole32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shell32-sys 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "xdg 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.3.16"
@@ -198,7 +210,7 @@ source = "git+https://github.com/ethcore/rust-ctrlc.git#f4927770f89eca80ec250911
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -279,7 +291,7 @@ name = "ethash"
 version = "1.5.0"
 dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha3 0.1.0",
 ]
@@ -397,7 +409,7 @@ dependencies = [
  "crossbeam 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.1 (git+https://github.com/ethcore/mio)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -502,7 +514,7 @@ dependencies = [
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.1 (git+https://github.com/ethcore/mio)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -599,7 +611,7 @@ dependencies = [
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru-cache 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.1.68 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
@@ -661,7 +673,7 @@ dependencies = [
  "itertools 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -690,7 +702,7 @@ dependencies = [
  "ethkey 0.2.0",
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
  "semver 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -855,7 +867,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -886,7 +898,7 @@ version = "4.0.0"
 source = "git+https://github.com/ethcore/jsonrpc.git#33262d626a294a00c20435dec331058ba65e224a"
 dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_codegen 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -947,7 +959,7 @@ name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1048,7 +1060,7 @@ dependencies = [
  "nix 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1064,7 +1076,7 @@ dependencies = [
  "nix 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1079,7 +1091,7 @@ dependencies = [
  "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.2.0 (git+https://github.com/carllerche/slab?rev=5476efcafb)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1095,7 +1107,7 @@ dependencies = [
  "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1105,7 +1117,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1116,7 +1128,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1145,7 +1157,7 @@ dependencies = [
  "cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1284,6 +1296,15 @@ name = "odds"
 version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "ole32-sys"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "owning_ref"
 version = "0.2.2"
@@ -1342,25 +1363,14 @@ dependencies = [
 [[package]]
 name = "parity-ui-precompiled"
 version = "1.4.0"
-source = "git+https://github.com/ethcore/js-precompiled.git#175003ae159b126302fd1a90dd875dc86d7adba0"
+source = "git+https://github.com/ethcore/js-precompiled.git#a80a0c512cf569985ec1fffc5ea5ae70eb6c1e1f"
 dependencies = [
  "parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parking_lot"
-version = "0.2.8"
+version = "0.3.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "parking_lot"
-version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "owning_ref 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1376,7 +1386,7 @@ dependencies = [
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1599,7 +1609,7 @@ dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "termios 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1726,6 +1736,15 @@ dependencies = [
  "gcc 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "shell32-sys"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "siphasher"
 version = "0.1.1"
@@ -1869,7 +1888,7 @@ version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1878,7 +1897,7 @@ version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1913,7 +1932,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2009,7 +2028,7 @@ name = "vecio"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2040,7 +2059,7 @@ dependencies = [
 
 [[package]]
 name = "winapi"
-version = "0.2.6"
+version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -2068,10 +2087,15 @@ name = "ws2_32-sys"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "xdg"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "xml-rs"
 version = "0.3.4"
@@ -2102,6 +2126,7 @@ dependencies = [
 [metadata]
 "checksum aho-corasick 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "67077478f0a03952bed2e6786338d400d40c25e9836e08ad50af96607317fd03"
 "checksum ansi_term 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1f46cd5b1d660c938e3f92dfe7a73d832b3281479363dd0cd9c1c2fbf60f7962"
+"checksum app_dirs 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b7d1c0d48a81bbb13043847f957971f4d87c81542d80ece5e84ba3cba4058fd4"
 "checksum arrayvec 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)" = "16e3bdb2f54b3ace0285975d59a97cf8ed3855294b2b6bc651fcf22a9c352975"
 "checksum aster 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07d344974f0a155f091948aa389fb1b912d3a58414fbdb9c8d446d193ee3496a"
 "checksum aster 0.25.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4df293303e8a52e1df7984ac1415e195f5fcbf51e4bb7bda54557861a3954a08"
@@ -2190,11 +2215,11 @@ dependencies = [
 "checksum num_cpus 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "51fedae97a05f7353612fe017ab705a37e6db8f4d67c5c6fe739a9e70d6eed09"
 "checksum number_prefix 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "084d05f4bf60621a9ac9bde941a410df548f4de9545f06e5ee9d3aef4b97cd77"
 "checksum odds 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)" = "b28c06e81b0f789122d415d6394b5fe849bde8067469f4c2980d3cdc10c78ec1"
+"checksum ole32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5d2c49021782e5233cd243168edfa8037574afed4eba4bbaf538b3d8d1789d8c"
 "checksum owning_ref 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8d91377085359426407a287ab16884a0111ba473aa6844ff01d4ec20ce3d75e7"
 "checksum parity-dapps-glue 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "98378dec0a185da2b7180308752f0bad73aaa949c3e0a3b0528d0e067945f7ab"
 "checksum parity-ui-precompiled 1.4.0 (git+https://github.com/ethcore/js-precompiled.git)" = "<none>"
-"checksum parking_lot 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "968f685642555d2f7e202c48b8b11de80569e9bfea817f7f12d7c61aac62d4e6"
+"checksum parking_lot 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "e1435e7a2a00dfebededd6c6bdbd54008001e94b4a2aadd6aef0dc4c56317621"
-"checksum parking_lot 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "dbc5847584161f273e69edc63c1a86254a22f570a0b5dd87aa6f9773f6f7d125"
 "checksum parking_lot_core 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fb1b97670a2ffadce7c397fb80a3d687c4f3060140b885621ef1653d0e5d5068"
 "checksum phf 0.7.14 (registry+https://github.com/rust-lang/crates.io-index)" = "447d9d45f2e0b4a9b532e808365abf18fc211be6ca217202fcd45236ef12f026"
 "checksum phf_codegen 0.7.14 (registry+https://github.com/rust-lang/crates.io-index)" = "8af7ae7c3f75a502292b491e5cc0a1f69e3407744abe6e57e2a3b712bb82f01d"
@@ -2233,6 +2258,7 @@ dependencies = [
 "checksum serde_codegen_internals 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f877e2781ed0a323295d1c9f0e26556117b5a11489fc47b1848dfb98b3173d21"
 "checksum serde_json 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0e10f8a9d94b06cf5d3bef66475f04c8ff90950f1be7004c357ff9472ccbaebc"
 "checksum sha1 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cc30b1e1e8c40c121ca33b86c23308a090d19974ef001b4bf6e61fd1a0fb095c"
+"checksum shell32-sys 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "72f20b8f3c060374edb8046591ba28f62448c369ccbdc7b02075103fb3a9e38d"
 "checksum siphasher 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c44e42fa187b5a8782489cf7740cc27c3125806be2bf33563cf5e02e9533fcd"
 "checksum slab 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d807fd58c4181bbabed77cb3b891ba9748241a552bcc5be698faaebefc54f46e"
 "checksum slab 0.2.0 (git+https://github.com/carllerche/slab?rev=5476efcafb)" = "<none>"
@@ -2274,10 +2300,11 @@ dependencies = [
 "checksum vergen 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "56b639f935488eb40f06d17c3e3bcc3054f6f75d264e187b1107c8d1cba8d31c"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum webpki 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "813503a5985585e0812d430cd1328ee322f47f66629c8ed4ecab939cf9e92f91"
-"checksum winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "4dfaaa8fbdaa618fa6914b59b2769d690dd7521920a18d84b42d254678dd5fd4"
+"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum ws 0.5.3 (git+https://github.com/ethcore/ws-rs.git?branch=mio-upstream-stable)" = "<none>"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+"checksum xdg 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "77b831a5ba77110f438f0ac5583aafeb087f70432998ba6b7dcb1d32185db453"
 "checksum xml-rs 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "65e74b96bd3179209dc70a980da6df843dff09e46eee103a0376c0949257e3ef"
 "checksum xmltree 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "472a9d37c7c53ab2391161df5b89b1f3bf76dab6ab150d7941ecbdd832282082"
 "checksum zip 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "3ceb33a75b3d0608942302eed325b59d2c3ed777cc6c01627ae14e5697c6a31c"

Cargo.toml

@@ -28,6 +28,7 @@ isatty = "0.1"
 toml = "0.2"
 serde = "0.8.0"
 serde_json = "0.8.0"
+app_dirs = "1.1.1"
 hyper = { version = "0.9", default-features = false }
 ctrlc = { git = "https://github.com/ethcore/rust-ctrlc.git" }
 fdlimit = "0.1"

ethcore/res/authority_round.json

@@ -21,8 +21,9 @@
 	},
 	"genesis": {
 		"seal": {
-			"generic": {
+			"authority_round": {
-				"rlp": "0xc28080"
+				"step": "0x0",
+				"signature": "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
 			}
 		},
 		"difficulty": "0x20000",

ethcore/res/basic_authority.json

@@ -17,10 +17,7 @@
 	},
 	"genesis": {
 		"seal": {
-			"generic": {
+			"generic": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
-				"fields": 1,
-				"rlp": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
-			}
 		},
 		"difficulty": "0x20000",
 		"author": "0x0000000000000000000000000000000000000000",

ethcore/res/ethereum/classic.json

@@ -1,6 +1,6 @@
 {
 	"name": "Ethereum Classic",
-	"forkName": "classic",
+	"dataDir": "classic",
 	"engine": {
 		"Ethash": {
 			"params": {

ethcore/res/ethereum/expanse.json

@@ -1,6 +1,6 @@
 {
 	"name": "Expanse",
-	"forkName": "expanse",
+	"dataDir": "expanse",
 	"engine": {
 		"Ethash": {
 			"params": {

ethcore/res/ethereum/frontier.json

@@ -1,5 +1,6 @@
 {
 	"name": "Frontier/Homestead",
+	"dataDir": "ethereum",
 	"engine": {
 		"Ethash": {
 			"params": {

ethcore/res/ethereum/morden.json

@@ -1,5 +1,6 @@
 {
 	"name": "Morden",
+	"dataDir": "test",
 	"engine": {
 		"Ethash": {
 			"params": {

ethcore/res/ethereum/ropsten.json

@@ -1,5 +1,6 @@
 {
 	"name": "Ropsten",
+	"dataDir": "test",
 	"engine": {
 		"Ethash": {
 			"params": {

ethcore/res/instant_seal.json

@@ -4,29 +4,27 @@
 		"InstantSeal": null
 	},
 	"params": {
-		"accountStartNonce": "0x0100000",
+		"accountStartNonce": "0x0",
 		"maximumExtraDataSize": "0x20",
 		"minGasLimit": "0x1388",
-		"networkID" : "0x2"
+		"networkID" : "0x11"
 	},
 	"genesis": {
 		"seal": {
-			"generic": {
+			"generic": "0x0"
-				"rlp": "0x0"
-			}
 		},
 		"difficulty": "0x20000",
 		"author": "0x0000000000000000000000000000000000000000",
 		"timestamp": "0x00",
 		"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
 		"extraData": "0x",
-		"gasLimit": "0x2fefd8"
+		"gasLimit": "0x5B8D80"
 	},
 	"accounts": {
-		"0000000000000000000000000000000000000001": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
+		"0000000000000000000000000000000000000001": { "balance": "1", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
-		"0000000000000000000000000000000000000002": { "balance": "1", "nonce": "1048576", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
+		"0000000000000000000000000000000000000002": { "balance": "1", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
-		"0000000000000000000000000000000000000003": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
+		"0000000000000000000000000000000000000003": { "balance": "1", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
-		"0000000000000000000000000000000000000004": { "balance": "1", "nonce": "1048576", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
+		"0000000000000000000000000000000000000004": { "balance": "1", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
-		"0x00a329c0648769a73afac7f9381e08fb43dbea72": { "balance": "1606938044258990275541962092341162602522202993782792835301376", "nonce": "1048576" }
+		"0x00a329c0648769a73afac7f9381e08fb43dbea72": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
 	}
 }

ethcore/res/tendermint.json

@@ -0,0 +1,44 @@
+{
+	"name": "TestBFT",
+	"engine": {
+		"Tendermint": {
+			"params": {
+				"gasLimitBoundDivisor": "0x0400",
+				"authorities" : [
+					"0x82a978b3f5962a5b0957d9ee9eef472ee55b42f1",
+					"0x7d577a597b2742b498cb5cf0c26cdcd726d39e6e"
+				]
+			}
+		}
+	},
+	"params": {
+		"accountStartNonce": "0x0",
+		"maximumExtraDataSize": "0x20",
+		"minGasLimit": "0x1388",
+		"networkID" : "0x2323"
+	},
+	"genesis": {
+		"seal": {
+			"tendermint": {
+				"round": "0x0",
+				"proposal": "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+				"precommits": [
+					"0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+				]
+			}
+		},
+		"difficulty": "0x20000",
+		"author": "0x0000000000000000000000000000000000000000",
+		"timestamp": "0x00",
+		"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+		"extraData": "0x",
+		"gasLimit": "0x2fefd8"
+	},
+	"accounts": {
+		"0000000000000000000000000000000000000001": { "balance": "1", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
+		"0000000000000000000000000000000000000002": { "balance": "1", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
+		"0000000000000000000000000000000000000003": { "balance": "1", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
+		"0000000000000000000000000000000000000004": { "balance": "1", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
+		"9cce34f7ab185c7aba1b7c8140d620b4bda941d6": { "balance": "1606938044258990275541962092341162602522202993782792835301376" }
+	}
+}

ethcore/src/account_provider/mod.rs

@@ -23,9 +23,9 @@ use self::stores::{AddressBook, DappsSettingsStore};
 use std::fmt;
 use std::collections::HashMap;
 use std::time::{Instant, Duration};
-use util::{Mutex, RwLock};
+use util::RwLock;
-use ethstore::{SecretStore, Error as SSError, SafeAccount, EthStore};
+use ethstore::{SimpleSecretStore, SecretStore, Error as SSError, EthStore, EthMultiStore, random_string};
-use ethstore::dir::{KeyDirectory};
+use ethstore::dir::MemoryDirectory;
 use ethstore::ethkey::{Address, Message, Public, Secret, Random, Generator};
 use ethjson::misc::AccountMeta;
 pub use ethstore::ethkey::Signature;
@@ -73,58 +73,47 @@ impl From<SSError> for Error {
 	}
 }
 
-#[derive(Default)]
-struct NullDir {
-	accounts: RwLock<HashMap<Address, SafeAccount>>,
-}
-
-impl KeyDirectory for NullDir {
-	fn load(&self) -> Result<Vec<SafeAccount>, SSError> {
-		Ok(self.accounts.read().values().cloned().collect())
-	}
-
-	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, SSError> {
-		self.accounts.write().insert(account.address.clone(), account.clone());
-		Ok(account)
-	}
-
-	fn remove(&self, address: &Address) -> Result<(), SSError> {
-		self.accounts.write().remove(address);
-		Ok(())
-	}
-}
-
 /// Dapp identifier
 pub type DappId = String;
 
+fn transient_sstore() -> EthMultiStore {
+	EthMultiStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory load always succeeds; qed")
+}
+
+type AccountToken = String;
+
 /// Account management.
 /// Responsible for unlocking accounts.
 pub struct AccountProvider {
-	unlocked: Mutex<HashMap<Address, AccountData>>,
+	unlocked: RwLock<HashMap<Address, AccountData>>,
-	sstore: Box<SecretStore>,
 	address_book: RwLock<AddressBook>,
 	dapps_settings: RwLock<DappsSettingsStore>,
+	/// Accounts on disk
+	sstore: Box<SecretStore>,
+	/// Accounts unlocked with rolling tokens
+	transient_sstore: EthMultiStore,
 }
 
 impl AccountProvider {
 	/// Creates new account provider.
 	pub fn new(sstore: Box<SecretStore>) -> Self {
 		AccountProvider {
-			unlocked: Mutex::new(HashMap::new()),
+			unlocked: RwLock::new(HashMap::new()),
 			address_book: RwLock::new(AddressBook::new(sstore.local_path().into())),
 			dapps_settings: RwLock::new(DappsSettingsStore::new(sstore.local_path().into())),
 			sstore: sstore,
+			transient_sstore: transient_sstore(),
 		}
 	}
 
 	/// Creates not disk backed provider.
 	pub fn transient_provider() -> Self {
 		AccountProvider {
-			unlocked: Mutex::new(HashMap::new()),
+			unlocked: RwLock::new(HashMap::new()),
 			address_book: RwLock::new(AddressBook::transient()),
 			dapps_settings: RwLock::new(DappsSettingsStore::transient()),
-			sstore: Box::new(EthStore::open(Box::new(NullDir::default()))
+			sstore: Box::new(EthStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory load always succeeds; qed")),
-				.expect("NullDir load always succeeds; qed"))
+			transient_sstore: transient_sstore(),
 		}
 	}
 
@@ -231,11 +220,8 @@ impl AccountProvider {
 
 	/// Returns `true` if the password for `account` is `password`. `false` if not.
 	pub fn test_password(&self, account: &Address, password: &str) -> Result<bool, Error> {
-		match self.sstore.sign(account, password, &Default::default()) {
+		self.sstore.test_password(account, password)
-			Ok(_) => Ok(true),
+			.map_err(Into::into)
-			Err(SSError::InvalidPassword) => Ok(false),
-			Err(e) => Err(Error::SStore(e)),
-		}
 	}
 
 	/// Permanently removes an account.
@@ -256,7 +242,7 @@ impl AccountProvider {
 		let _ = try!(self.sstore.sign(&account, &password, &Default::default()));
 
 		// check if account is already unlocked pernamently, if it is, do nothing
-		let mut unlocked = self.unlocked.lock();
+		let mut unlocked = self.unlocked.write();
 		if let Some(data) = unlocked.get(&account) {
 			if let Unlock::Perm = data.unlock {
 				return Ok(())
@@ -273,7 +259,7 @@ impl AccountProvider {
 	}
 
 	fn password(&self, account: &Address) -> Result<String, Error> {
-		let mut unlocked = self.unlocked.lock();
+		let mut unlocked = self.unlocked.write();
 		let data = try!(unlocked.get(account).ok_or(Error::NotUnlocked)).clone();
 		if let Unlock::Temp = data.unlock {
 			unlocked.remove(account).expect("data exists: so key must exist: qed");
@@ -304,7 +290,7 @@ impl AccountProvider {
 
 	/// Checks if given account is unlocked
 	pub fn is_unlocked(&self, account: Address) -> bool {
-		let unlocked = self.unlocked.lock();
+		let unlocked = self.unlocked.read();
 		unlocked.get(&account).is_some()
 	}
 
@@ -314,6 +300,48 @@ impl AccountProvider {
 		Ok(try!(self.sstore.sign(&account, &password, &message)))
 	}
 
+	/// Signs given message with supplied token. Returns a token to use in next signing within this session.
+	pub fn sign_with_token(&self, account: Address, token: AccountToken, message: Message) -> Result<(Signature, AccountToken), Error> {
+		let is_std_password = try!(self.sstore.test_password(&account, &token));
+
+		let new_token = random_string(16);
+		let signature = if is_std_password {
+			// Insert to transient store
+			try!(self.sstore.copy_account(&self.transient_sstore, &account, &token, &new_token));
+			// sign
+			try!(self.sstore.sign(&account, &token, &message))
+		} else {
+			// check transient store
+			try!(self.transient_sstore.change_password(&account, &token, &new_token));
+			// and sign
+			try!(self.transient_sstore.sign(&account, &new_token, &message))
+		};
+
+		Ok((signature, new_token))
+	}
+
+	/// Decrypts a message with given token. Returns a token to use in next operation for this account.
+	pub fn decrypt_with_token(&self, account: Address, token: AccountToken, shared_mac: &[u8], message: &[u8])
+		-> Result<(Vec<u8>, AccountToken), Error>
+	{
+		let is_std_password = try!(self.sstore.test_password(&account, &token));
+
+		let new_token = random_string(16);
+		let message = if is_std_password {
+			// Insert to transient store
+			try!(self.sstore.copy_account(&self.transient_sstore, &account, &token, &new_token));
+			// decrypt
+			try!(self.sstore.decrypt(&account, &token, shared_mac, message))
+		} else {
+			// check transient store
+			try!(self.transient_sstore.change_password(&account, &token, &new_token));
+			// and decrypt
+			try!(self.transient_sstore.decrypt(&account, &token, shared_mac, message))
+		};
+
+		Ok((message, new_token))
+	}
+
 	/// Decrypts a message. If password is not provided the account must be unlocked.
 	pub fn decrypt(&self, account: Address, password: Option<String>, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
 		let password = try!(password.map(Ok).unwrap_or_else(|| self.password(&account)));
@@ -370,10 +398,26 @@ mod tests {
 		assert!(ap.unlock_account_timed(kp.address(), "test1".into(), 60000).is_err());
 		assert!(ap.unlock_account_timed(kp.address(), "test".into(), 60000).is_ok());
 		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
-		ap.unlocked.lock().get_mut(&kp.address()).unwrap().unlock = Unlock::Timed(Instant::now());
+		ap.unlocked.write().get_mut(&kp.address()).unwrap().unlock = Unlock::Timed(Instant::now());
 		assert!(ap.sign(kp.address(), None, Default::default()).is_err());
 	}
 
+	#[test]
+	fn should_sign_and_return_token() {
+		// given
+		let kp = Random.generate().unwrap();
+		let ap = AccountProvider::transient_provider();
+		assert!(ap.insert_account(kp.secret().clone(), "test").is_ok());
+
+		// when
+		let (_signature, token) = ap.sign_with_token(kp.address(), "test".into(), Default::default()).unwrap();
+
+		// then
+		ap.sign_with_token(kp.address(), token.clone(), Default::default())
+			.expect("First usage of token should be correct.");
+		assert!(ap.sign_with_token(kp.address(), token, Default::default()).is_err(), "Second usage of the same token should fail.");
+	}
+
 	#[test]
 	fn should_set_dapps_addresses() {
 		// given

ethcore/src/client/chain_notify.rs

@@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use ipc::IpcConfig;
-use util::H256;
+use util::{H256, Bytes};
 
 /// Represents what has to be handled by actor listening to chain events
 #[ipc]
@@ -27,6 +27,8 @@ pub trait ChainNotify : Send + Sync {
 		_enacted: Vec<H256>,
 		_retracted: Vec<H256>,
 		_sealed: Vec<H256>,
+		// Block bytes.
+		_proposed: Vec<Bytes>,
 		_duration: u64) {
 		// does nothing by default
 	}
@@ -41,6 +43,9 @@ pub trait ChainNotify : Send + Sync {
 		// does nothing by default
 	}
 
+	/// fires when chain broadcasts a message
+	fn broadcast(&self, _data: Vec<u8>) {}
+
 	/// fires when new transactions are received from a peer
 	fn transactions_received(&self,
 		_hashes: Vec<H256>,

ethcore/src/client/client.rs

@@ -24,8 +24,8 @@ use time::precise_time_ns;
 // util
 use util::{Bytes, PerfTimer, Itertools, Mutex, RwLock, Hashable};
 use util::{journaldb, TrieFactory, Trie};
-use util::trie::TrieSpec;
 use util::{U256, H256, Address, H2048, Uint, FixedHash};
+use util::trie::TrieSpec;
 use util::kvdb::*;
 
 // other
@@ -396,9 +396,10 @@ impl Client {
 	/// This is triggered by a message coming from a block queue when the block is ready for insertion
 	pub fn import_verified_blocks(&self) -> usize {
 		let max_blocks_to_import = 4;
-		let (imported_blocks, import_results, invalid_blocks, imported, duration, is_empty) = {
+		let (imported_blocks, import_results, invalid_blocks, imported, proposed_blocks, duration, is_empty) = {
 			let mut imported_blocks = Vec::with_capacity(max_blocks_to_import);
 			let mut invalid_blocks = HashSet::new();
+			let mut proposed_blocks = Vec::with_capacity(max_blocks_to_import);
 			let mut import_results = Vec::with_capacity(max_blocks_to_import);
 
 			let _import_lock = self.import_lock.lock();
@@ -417,12 +418,17 @@ impl Client {
 					continue;
 				}
 				if let Ok(closed_block) = self.check_and_close_block(&block) {
-					imported_blocks.push(header.hash());
+					if self.engine.is_proposal(&block.header) {
+						self.block_queue.mark_as_good(&[header.hash()]);
+						proposed_blocks.push(block.bytes);
+					} else {
+						imported_blocks.push(header.hash());
 
-					let route = self.commit_block(closed_block, &header.hash(), &block.bytes);
+						let route = self.commit_block(closed_block, &header.hash(), &block.bytes);
-					import_results.push(route);
+						import_results.push(route);
 
-					self.report.write().accrue_block(&block);
+						self.report.write().accrue_block(&block);
+					}
 				} else {
 					invalid_blocks.insert(header.hash());
 				}
@@ -436,7 +442,7 @@ impl Client {
 			}
 			let is_empty = self.block_queue.mark_as_good(&imported_blocks);
 			let duration_ns = precise_time_ns() - start;
-			(imported_blocks, import_results, invalid_blocks, imported, duration_ns, is_empty)
+			(imported_blocks, import_results, invalid_blocks, imported, proposed_blocks, duration_ns, is_empty)
 		};
 
 		{
@@ -454,6 +460,7 @@ impl Client {
 						enacted.clone(),
 						retracted.clone(),
 						Vec::new(),
+						proposed_blocks.clone(),
 						duration,
 					);
 				});
@@ -577,9 +584,10 @@ impl Client {
 		self.miner.clone()
 	}
 
-	/// Used by PoA to try sealing on period change.
+
-	pub fn update_sealing(&self) {
+	/// Replace io channel. Useful for testing.
-		self.miner.update_sealing(self)
+	pub fn set_io_channel(&self, io_channel: IoChannel<ClientIoMessage>) {
+		*self.io_channel.lock() = io_channel;
 	}
 
 	/// Attempt to get a copy of a specific block's final state.
@@ -1290,6 +1298,18 @@ impl BlockChainClient for Client {
 		self.miner.pending_transactions(self.chain.read().best_block_number())
 	}
 
+	fn queue_consensus_message(&self, message: Bytes) {
+		let channel = self.io_channel.lock().clone();
+		if let Err(e) = channel.send(ClientIoMessage::NewMessage(message)) {
+			debug!("Ignoring the message, error queueing: {}", e);
+		}
+	}
+
+	fn broadcast_consensus_message(&self, message: Bytes) {
+		self.notify(|notify| notify.broadcast(message.clone()));
+	}
+
+
 	fn signing_network_id(&self) -> Option<u64> {
 		self.engine.signing_network_id(&self.latest_env_info())
 	}
@@ -1314,7 +1334,6 @@ impl BlockChainClient for Client {
 }
 
 impl MiningBlockChainClient for Client {
-
 	fn latest_schedule(&self) -> Schedule {
 		self.engine.schedule(&self.latest_env_info())
 	}
@@ -1357,6 +1376,30 @@ impl MiningBlockChainClient for Client {
 		&self.factories.vm
 	}
 
+	fn update_sealing(&self) {
+		self.miner.update_sealing(self)
+	}
+
+	fn submit_seal(&self, block_hash: H256, seal: Vec<Bytes>) {
+		if self.miner.submit_seal(self, block_hash, seal).is_err() {
+			warn!(target: "poa", "Wrong internal seal submission!")
+		}
+	}
+
+	fn broadcast_proposal_block(&self, block: SealedBlock) {
+		self.notify(|notify| {
+			notify.new_blocks(
+				vec![],
+				vec![],
+				vec![],
+				vec![],
+				vec![],
+				vec![block.rlp_bytes()],
+				0,
+			);
+		});
+	}
+
 	fn import_sealed_block(&self, block: SealedBlock) -> ImportResult {
 		let h = block.header().hash();
 		let start = precise_time_ns();
@@ -1381,6 +1424,7 @@ impl MiningBlockChainClient for Client {
 				enacted.clone(),
 				retracted.clone(),
 				vec![h.clone()],
+				vec![],
 				precise_time_ns() - start,
 			);
 		});
@@ -1416,6 +1460,12 @@ impl ::client::ProvingBlockChainClient for Client {
 	}
 }
 
+impl Drop for Client {
+	fn drop(&mut self) {
+		self.engine.stop();
+	}
+}
+
 #[cfg(test)]
 mod tests {
 

ethcore/src/client/test_client.rs

@@ -360,6 +360,18 @@ impl MiningBlockChainClient for TestBlockChainClient {
 	fn import_sealed_block(&self, _block: SealedBlock) -> ImportResult {
 		Ok(H256::default())
 	}
+
+	fn broadcast_proposal_block(&self, _block: SealedBlock) {}
+
+	fn update_sealing(&self) {
+		self.miner.update_sealing(self)
+	}
+
+	fn submit_seal(&self, block_hash: H256, seal: Vec<Bytes>) {
+		if self.miner.submit_seal(self, block_hash, seal).is_err() {
+			warn!(target: "poa", "Wrong internal seal submission!")
+		}
+	}
 }
 
 impl BlockChainClient for TestBlockChainClient {
@@ -663,6 +675,12 @@ impl BlockChainClient for TestBlockChainClient {
 		self.miner.import_external_transactions(self, txs);
 	}
 
+	fn queue_consensus_message(&self, message: Bytes) {
+		self.spec.engine.handle_message(&message).unwrap();
+	}
+
+	fn broadcast_consensus_message(&self, _message: Bytes) {}
+
 	fn pending_transactions(&self) -> Vec<SignedTransaction> {
 		self.miner.pending_transactions(self.chain_info().best_block_number)
 	}

ethcore/src/client/traits.rs

@@ -202,6 +202,12 @@ pub trait BlockChainClient : Sync + Send {
 	/// Queue transactions for importing.
 	fn queue_transactions(&self, transactions: Vec<Bytes>, peer_id: usize);
 
+	/// Queue conensus engine message.
+	fn queue_consensus_message(&self, message: Bytes);
+
+	/// Used by PoA to communicate with peers.
+	fn broadcast_consensus_message(&self, message: Bytes);
+
 	/// list all transactions
 	fn pending_transactions(&self) -> Vec<SignedTransaction>;
 
@@ -273,6 +279,15 @@ pub trait MiningBlockChainClient: BlockChainClient {
 	/// Returns EvmFactory.
 	fn vm_factory(&self) -> &EvmFactory;
 
+	/// Used by PoA to try sealing on period change.
+	fn update_sealing(&self);
+
+	/// Used by PoA to submit gathered signatures.
+	fn submit_seal(&self, block_hash: H256, seal: Vec<Bytes>);
+
+	/// Broadcast a block proposal.
+	fn broadcast_proposal_block(&self, block: SealedBlock);
+
 	/// Import sealed block. Skips all verifications.
 	fn import_sealed_block(&self, block: SealedBlock) -> ImportResult;
 

ethcore/src/engines/authority_round.rs

@@ -25,7 +25,7 @@ use rlp::{UntrustedRlp, Rlp, View, encode};
 use account_provider::AccountProvider;
 use block::*;
 use spec::CommonParams;
-use engines::Engine;
+use engines::{Engine, Seal, EngineError};
 use header::Header;
 use error::{Error, BlockError};
 use blockchain::extras::BlockDetails;
@@ -225,8 +225,8 @@ impl Engine for AuthorityRound {
 	///
 	/// This operation is synchronous and may (quite reasonably) not be available, in which `false` will
 	/// be returned.
-	fn generate_seal(&self, block: &ExecutedBlock) -> Option<Vec<Bytes>> {
+	fn generate_seal(&self, block: &ExecutedBlock) -> Seal {
-		if self.proposed.load(AtomicOrdering::SeqCst) { return None; }
+		if self.proposed.load(AtomicOrdering::SeqCst) { return Seal::None; }
 		let header = block.header();
 		let step = self.step();
 		if self.is_step_proposer(step, header.author()) {
@@ -235,7 +235,8 @@ impl Engine for AuthorityRound {
 				if let Ok(signature) = ap.sign(*header.author(), self.password.read().clone(), header.bare_hash()) {
 					trace!(target: "poa", "generate_seal: Issuing a block for step {}.", step);
 					self.proposed.store(true, AtomicOrdering::SeqCst);
-					return Some(vec![encode(&step).to_vec(), encode(&(&*signature as &[u8])).to_vec()]);
+					let rlps = vec![encode(&step).to_vec(), encode(&(&*signature as &[u8])).to_vec()];
+					return Seal::Regular(rlps);
 				} else {
 					warn!(target: "poa", "generate_seal: FAIL: Accounts secret key unavailable.");
 				}
@@ -245,7 +246,7 @@ impl Engine for AuthorityRound {
 		} else {
 			trace!(target: "poa", "generate_seal: Not a proposer for step {}.", step);
 		}
-		None
+		Seal::None
 	}
 
 	/// Check the number of seal fields.
@@ -288,7 +289,7 @@ impl Engine for AuthorityRound {
 		// Check if parent is from a previous step.
 		if step == try!(header_step(parent)) {
 			trace!(target: "poa", "Multiple blocks proposed for step {}.", step);
-			try!(Err(BlockError::DoubleVote(header.author().clone())));
+			try!(Err(EngineError::DoubleVote(header.author().clone())));
 		}
 
 		let gas_limit_divisor = self.our_params.gas_limit_bound_divisor;
@@ -347,6 +348,7 @@ mod tests {
 	use tests::helpers::*;
 	use account_provider::AccountProvider;
 	use spec::Spec;
+	use engines::Seal;
 
 	#[test]
 	fn has_valid_metadata() {
@@ -416,17 +418,17 @@ mod tests {
 		let b2 = b2.close_and_lock();
 
 		engine.set_signer(addr1, "1".into());
-		if let Some(seal) = engine.generate_seal(b1.block()) {
+		if let Seal::Regular(seal) = engine.generate_seal(b1.block()) {
 			assert!(b1.clone().try_seal(engine, seal).is_ok());
 			// Second proposal is forbidden.
-			assert!(engine.generate_seal(b1.block()).is_none());
+			assert!(engine.generate_seal(b1.block()) == Seal::None);
 		}
 
 		engine.set_signer(addr2, "2".into());
-		if let Some(seal) = engine.generate_seal(b2.block()) {
+		if let Seal::Regular(seal) = engine.generate_seal(b2.block()) {
 			assert!(b2.clone().try_seal(engine, seal).is_ok());
 			// Second proposal is forbidden.
-			assert!(engine.generate_seal(b2.block()).is_none());
+			assert!(engine.generate_seal(b2.block()) == Seal::None);
 		}
 	}
 

ethcore/src/engines/basic_authority.rs

@@ -21,7 +21,7 @@ use account_provider::AccountProvider;
 use block::*;
 use builtin::Builtin;
 use spec::CommonParams;
-use engines::Engine;
+use engines::{Engine, Seal};
 use env_info::EnvInfo;
 use error::{BlockError, Error};
 use evm::Schedule;
@@ -112,20 +112,20 @@ impl Engine for BasicAuthority {
 	///
 	/// This operation is synchronous and may (quite reasonably) not be available, in which `false` will
 	/// be returned.
-	fn generate_seal(&self, block: &ExecutedBlock) -> Option<Vec<Bytes>> {
+	fn generate_seal(&self, block: &ExecutedBlock) -> Seal {
 		if let Some(ref ap) = *self.account_provider.lock() {
 			let header = block.header();
 			let message = header.bare_hash();
 			// account should be pernamently unlocked, otherwise sealing will fail
 			if let Ok(signature) = ap.sign(*block.header().author(), self.password.read().clone(), message) {
-				return Some(vec![::rlp::encode(&(&*signature as &[u8])).to_vec()]);
+				return Seal::Regular(vec![::rlp::encode(&(&*signature as &[u8])).to_vec()]);
 			} else {
 				trace!(target: "basicauthority", "generate_seal: FAIL: accounts secret key unavailable");
 			}
 		} else {
 			trace!(target: "basicauthority", "generate_seal: FAIL: accounts not provided");
 		}
-		None
+		Seal::None
 	}
 
 	fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
@@ -199,6 +199,7 @@ mod tests {
 	use account_provider::AccountProvider;
 	use header::Header;
 	use spec::Spec;
+	use engines::Seal;
 
 	/// Create a new test chain spec with `BasicAuthority` consensus engine.
 	fn new_test_authority() -> Spec {
@@ -269,8 +270,9 @@ mod tests {
 		let last_hashes = Arc::new(vec![genesis_header.hash()]);
 		let b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, addr, (3141562.into(), 31415620.into()), vec![]).unwrap();
 		let b = b.close_and_lock();
-		let seal = engine.generate_seal(b.block()).unwrap();
+		if let Seal::Regular(seal) = engine.generate_seal(b.block()) {
-		assert!(b.try_seal(engine, seal).is_ok());
+			assert!(b.try_seal(engine, seal).is_ok());
+		}
 	}
 
 	#[test]

ethcore/src/engines/instant_seal.rs

@@ -17,12 +17,11 @@
 use std::collections::BTreeMap;
 use util::Address;
 use builtin::Builtin;
-use engines::Engine;
+use engines::{Engine, Seal};
 use env_info::EnvInfo;
 use spec::CommonParams;
 use evm::Schedule;
 use block::ExecutedBlock;
-use util::Bytes;
 
 /// An engine which does not provide any consensus mechanism, just seals blocks internally.
 pub struct InstantSeal {
@@ -54,13 +53,13 @@ impl Engine for InstantSeal {
 	}
 
 	fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
-		Schedule::new_post_eip150(usize::max_value(), false, false, false)
+		Schedule::new_post_eip150(usize::max_value(), true, true, true)
 	}
 
 	fn is_sealer(&self, _author: &Address) -> Option<bool> { Some(true) }
 
-	fn generate_seal(&self, _block: &ExecutedBlock) -> Option<Vec<Bytes>> {
+	fn generate_seal(&self, _block: &ExecutedBlock) -> Seal {
-		Some(Vec::new())
+		Seal::Regular(Vec::new())
 	}
 }
 
@@ -72,6 +71,7 @@ mod tests {
 	use spec::Spec;
 	use header::Header;
 	use block::*;
+	use engines::Seal;
 
 	#[test]
 	fn instant_can_seal() {
@@ -84,8 +84,9 @@ mod tests {
 		let last_hashes = Arc::new(vec![genesis_header.hash()]);
 		let b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, Address::default(), (3141562.into(), 31415620.into()), vec![]).unwrap();
 		let b = b.close_and_lock();
-		let seal = engine.generate_seal(b.block()).unwrap();
+		if let Seal::Regular(seal) = engine.generate_seal(b.block()) {
-		assert!(b.try_seal(engine, seal).is_ok());
+			assert!(b.try_seal(engine, seal).is_ok());
+		}
 	}
 
 	#[test]

ethcore/src/engines/mod.rs

@@ -20,11 +20,13 @@ mod null_engine;
 mod instant_seal;
 mod basic_authority;
 mod authority_round;
+mod tendermint;
 
 pub use self::null_engine::NullEngine;
 pub use self::instant_seal::InstantSeal;
 pub use self::basic_authority::BasicAuthority;
 pub use self::authority_round::AuthorityRound;
+pub use self::tendermint::Tendermint;
 
 use util::*;
 use account_provider::AccountProvider;
@@ -42,6 +44,47 @@ use ethereum::ethash;
 use blockchain::extras::BlockDetails;
 use views::HeaderView;
 
+/// Voting errors.
+#[derive(Debug)]
+pub enum EngineError {
+	/// Signature does not belong to an authority.
+	NotAuthorized(Address),
+	/// The same author issued different votes at the same step.
+	DoubleVote(Address),
+	/// The received block is from an incorrect proposer.
+	NotProposer(Mismatch<Address>),
+	/// Message was not expected.
+	UnexpectedMessage,
+	/// Seal field has an unexpected size.
+	BadSealFieldSize(OutOfBounds<usize>),
+}
+
+impl fmt::Display for EngineError {
+	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+		use self::EngineError::*;
+		let msg = match *self {
+			DoubleVote(ref address) => format!("Author {} issued too many blocks.", address),
+			NotProposer(ref mis) => format!("Author is not a current proposer: {}", mis),
+			NotAuthorized(ref address) => format!("Signer {} is not authorized.", address),
+			UnexpectedMessage => "This Engine should not be fed messages.".into(),
+			BadSealFieldSize(ref oob) => format!("Seal field has an unexpected length: {}", oob),
+		};
+
+		f.write_fmt(format_args!("Engine error ({})", msg))
+	}
+}
+
+/// Seal type.
+#[derive(Debug, PartialEq, Eq)]
+pub enum Seal {
+	/// Proposal seal; should be broadcasted, but not inserted into blockchain.
+	Proposal(Vec<Bytes>),
+	/// Regular block seal; should be part of the blockchain.
+	Regular(Vec<Bytes>),
+	/// Engine does generate seal for this block right now.
+	None,
+}
+
 /// A consensus mechanism for the chain. Generally either proof-of-work or proof-of-stake-based.
 /// Provides hooks into each of the major parts of block import.
 pub trait Engine : Sync + Send {
@@ -94,7 +137,7 @@ pub trait Engine : Sync + Send {
 	///
 	/// This operation is synchronous and may (quite reasonably) not be available, in which None will
 	/// be returned.
-	fn generate_seal(&self, _block: &ExecutedBlock) -> Option<Vec<Bytes>> { None }
+	fn generate_seal(&self, _block: &ExecutedBlock) -> Seal { Seal::None }
 
 	/// Phase 1 quick block verification. Only does checks that are cheap. `block` (the header's full block)
 	/// may be provided for additional checks. Returns either a null `Ok` or a general error detailing the problem with import.
@@ -133,6 +176,10 @@ pub trait Engine : Sync + Send {
 		header.set_gas_limit(parent.gas_limit().clone());
 	}
 
+	/// Handle any potential consensus messages;
+	/// updating consensus state and potentially issuing a new one.
+	fn handle_message(&self, _message: &[u8]) -> Result<(), Error> { Err(EngineError::UnexpectedMessage.into()) }
+
 	// TODO: builtin contract routing - to do this properly, it will require removing the built-in configuration-reading logic
 	// from Spec into here and removing the Spec::builtins field.
 	/// Determine whether a particular address is a builtin contract.
@@ -153,9 +200,16 @@ pub trait Engine : Sync + Send {
 		ethash::is_new_best_block(best_total_difficulty, parent_details, new_header)
 	}
 
+	/// Find out if the block is a proposal block and should not be inserted into the DB.
+	/// Takes a header of a fully verified block.
+	fn is_proposal(&self, _verified_header: &Header) -> bool { false }
+
 	/// Register an account which signs consensus messages.
 	fn set_signer(&self, _address: Address, _password: String) {}
 
+	/// Stops any services that the may hold the Engine and makes it safe to drop.
+	fn stop(&self) {}
+
 	/// Add a channel for communication with Client which can be used for sealing.
 	fn register_message_channel(&self, _message_channel: IoChannel<ClientIoMessage>) {}
 

ethcore/src/engines/tendermint/message.rs

@@ -0,0 +1,279 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tendermint message handling.
+
+use util::*;
+use super::{Height, Round, BlockHash, Step};
+use error::Error;
+use header::Header;
+use rlp::*;
+use ethkey::{recover, public_to_address};
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub struct ConsensusMessage {
+	pub signature: H520,
+	pub height: Height,
+	pub round: Round,
+	pub step: Step,
+	pub block_hash: Option<BlockHash>,
+}
+
+
+fn consensus_round(header: &Header) -> Result<Round, ::rlp::DecoderError> {
+	let round_rlp = header.seal().get(0).expect("seal passed basic verification; seal has 3 fields; qed");
+	UntrustedRlp::new(round_rlp.as_slice()).as_val()
+}
+
+impl ConsensusMessage {
+	pub fn new(signature: H520, height: Height, round: Round, step: Step, block_hash: Option<BlockHash>) -> Self {
+		ConsensusMessage {
+			signature: signature,
+			height: height,
+			round: round,
+			step: step,
+			block_hash: block_hash,
+		}
+	}
+
+	pub fn new_proposal(header: &Header) -> Result<Self, ::rlp::DecoderError> {
+		Ok(ConsensusMessage {
+			signature: try!(UntrustedRlp::new(header.seal().get(1).expect("seal passed basic verification; seal has 3 fields; qed").as_slice()).as_val()),
+			height: header.number() as Height,
+			round: try!(consensus_round(header)),
+			step: Step::Propose,
+			block_hash: Some(header.bare_hash()),
+		})
+	}
+
+	pub fn new_commit(proposal: &ConsensusMessage, signature: H520) -> Self {
+		ConsensusMessage {
+			signature: signature,
+			height: proposal.height,
+			round: proposal.round,
+			step: Step::Precommit,
+			block_hash: proposal.block_hash,
+		}
+	}
+
+	pub fn is_height(&self, height: Height) -> bool {
+		self.height == height
+	}
+
+	pub fn is_round(&self, height: Height, round: Round) -> bool {
+		self.height == height && self.round == round
+	}
+
+	pub fn is_step(&self, height: Height, round: Round, step: Step) -> bool {
+		self.height == height && self.round == round && self.step == step
+	}
+
+	pub fn is_block_hash(&self, h: Height, r: Round, s: Step, block_hash: Option<BlockHash>) -> bool {
+		self.height == h && self.round == r && self.step == s && self.block_hash == block_hash
+	}
+
+	pub fn is_aligned(&self, m: &ConsensusMessage) -> bool {
+		self.is_block_hash(m.height, m.round, m.step, m.block_hash)
+	}
+
+	pub fn verify(&self) -> Result<Address, Error> {
+		let full_rlp = ::rlp::encode(self);
+		let block_info = Rlp::new(&full_rlp).at(1);
+		let public_key = try!(recover(&self.signature.into(), &block_info.as_raw().sha3()));
+		Ok(public_to_address(&public_key))
+	}
+
+	pub fn precommit_hash(&self) -> H256 {
+		message_info_rlp(self.height, self.round, Step::Precommit, self.block_hash).sha3()
+	}
+}
+
+impl PartialOrd for ConsensusMessage {
+	fn partial_cmp(&self, m: &ConsensusMessage) -> Option<Ordering> {
+		Some(self.cmp(m))
+	}
+}
+
+impl Step {
+	fn number(&self) -> u8 {
+		match *self {
+			Step::Propose => 0,
+			Step::Prevote => 1,
+			Step::Precommit => 2,
+			Step::Commit => 3,
+		}
+	}
+}
+
+impl Ord for ConsensusMessage {
+	fn cmp(&self, m: &ConsensusMessage) -> Ordering {
+		if self.height != m.height {
+			self.height.cmp(&m.height)
+		} else if self.round != m.round {
+			self.round.cmp(&m.round)
+		} else if self.step != m.step {
+			self.step.number().cmp(&m.step.number())
+		} else {
+			self.signature.cmp(&m.signature)
+		}
+	}
+}
+
+impl Decodable for Step {
+	fn decode<D>(decoder: &D) -> Result<Self, DecoderError> where D: Decoder {
+		match try!(decoder.as_rlp().as_val()) {
+			0u8 => Ok(Step::Propose),
+			1 => Ok(Step::Prevote),
+			2 => Ok(Step::Precommit),
+			_ => Err(DecoderError::Custom("Invalid step.")),
+		}
+	}
+}
+
+impl Encodable for Step {
+	fn rlp_append(&self, s: &mut RlpStream) {
+		s.append(&self.number());
+	}
+}
+
+/// (signature, height, round, step, block_hash)
+impl Decodable for ConsensusMessage {
+	fn decode<D>(decoder: &D) -> Result<Self, DecoderError> where D: Decoder {
+		let rlp = decoder.as_rlp();
+		let m = try!(rlp.at(1));
+		let block_message: H256 = try!(m.val_at(3));
+		Ok(ConsensusMessage {
+			signature: try!(rlp.val_at(0)),
+			height: try!(m.val_at(0)),
+			round: try!(m.val_at(1)),
+			step: try!(m.val_at(2)),
+			block_hash: match block_message.is_zero() {
+				true => None,
+				false => Some(block_message),
+			}
+		})
+  }
+} 
+
+impl Encodable for ConsensusMessage {
+	fn rlp_append(&self, s: &mut RlpStream) {
+		let info = message_info_rlp(self.height, self.round, self.step, self.block_hash);
+		s.begin_list(2)
+			.append(&self.signature)
+			.append_raw(&info, 1);
+	}
+}
+
+pub fn message_info_rlp(height: Height, round: Round, step: Step, block_hash: Option<BlockHash>) -> Bytes {
+	// TODO: figure out whats wrong with nested list encoding
+	let mut s = RlpStream::new_list(5);
+	s.append(&height).append(&round).append(&step).append(&block_hash.unwrap_or_else(H256::zero));
+	s.out()
+}
+
+
+pub fn message_full_rlp(signature: &H520, vote_info: &Bytes) -> Bytes {
+	let mut s = RlpStream::new_list(2);
+	s.append(signature).append_raw(vote_info, 1);
+	s.out()
+}
+
+#[cfg(test)]
+mod tests {
+	use util::*;
+	use rlp::*;
+	use super::super::Step;
+	use super::*;
+	use account_provider::AccountProvider;
+	use header::Header;
+
+	#[test]
+	fn encode_decode() {
+		let message = ConsensusMessage {
+			signature: H520::default(),	
+			height: 10,
+			round: 123,
+			step: Step::Precommit,
+			block_hash: Some("1".sha3())
+		};
+		let raw_rlp = ::rlp::encode(&message).to_vec();
+		let rlp = Rlp::new(&raw_rlp);
+		assert_eq!(message, rlp.as_val());
+
+		let message = ConsensusMessage {
+			signature: H520::default(),	
+			height: 1314,
+			round: 0,
+			step: Step::Prevote,
+			block_hash: None
+		};
+		let raw_rlp = ::rlp::encode(&message);
+		let rlp = Rlp::new(&raw_rlp);
+		assert_eq!(message, rlp.as_val());
+	}
+
+	#[test]
+	fn generate_and_verify() {
+		let tap = Arc::new(AccountProvider::transient_provider());
+		let addr = tap.insert_account("0".sha3(), "0").unwrap();
+		tap.unlock_account_permanently(addr, "0".into()).unwrap();
+
+		let mi = message_info_rlp(123, 2, Step::Precommit, Some(H256::default()));
+
+		let raw_rlp = message_full_rlp(&tap.sign(addr, None, mi.sha3()).unwrap().into(), &mi);
+
+		let rlp = UntrustedRlp::new(&raw_rlp);
+		let message: ConsensusMessage = rlp.as_val().unwrap();
+		match message.verify() { Ok(a) if a == addr => {}, _ => panic!(), };
+	}
+
+	#[test]
+	fn proposal_message() {
+		let mut header = Header::default();
+		let seal = vec![
+			::rlp::encode(&0u8).to_vec(),
+			::rlp::encode(&H520::default()).to_vec(),
+			Vec::new()
+		];
+		header.set_seal(seal);
+		let message = ConsensusMessage::new_proposal(&header).unwrap();
+		assert_eq!(
+			message,
+			ConsensusMessage {
+				signature: Default::default(),
+				height: 0,
+				round: 0,
+				step: Step::Propose,
+				block_hash: Some(header.bare_hash())
+			}
+		);
+	}
+
+	#[test]
+	fn message_info_from_header() {
+		let header = Header::default();
+		let pro = ConsensusMessage {
+			signature: Default::default(),
+			height: 0,
+			round: 0,
+			step: Step::Propose,
+			block_hash: Some(header.bare_hash())
+		};
+		let pre = message_info_rlp(0, 0, Step::Precommit, Some(header.bare_hash()));
+
+		assert_eq!(pro.precommit_hash(), pre.sha3());
+	}
+}

ethcore/src/engines/tendermint/mod.rs

@@ -0,0 +1,966 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+/// Tendermint BFT consensus engine with round robin proof-of-authority.
+/// At each blockchain `Height` there can be multiple `Round`s of voting.
+/// Signatures always sign `Height`, `Round`, `Step` and `BlockHash` which is a block hash without seal.
+/// First a block with `Seal::Proposal` is issued by the designated proposer.
+/// Next the `Round` proceeds through `Prevote` and `Precommit` `Step`s.
+/// Block is issued when there is enough `Precommit` votes collected on a particular block at the end of a `Round`.
+/// Once enough votes have been gathered the proposer issues that block in the `Commit` step.
+
+mod message;
+mod transition;
+mod params;
+mod vote_collector;
+
+use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
+use util::*;
+use error::{Error, BlockError};
+use header::Header;
+use builtin::Builtin;
+use env_info::EnvInfo;
+use transaction::SignedTransaction;
+use rlp::{UntrustedRlp, View};
+use ethkey::{recover, public_to_address};
+use account_provider::AccountProvider;
+use block::*;
+use spec::CommonParams;
+use engines::{Engine, Seal, EngineError};
+use blockchain::extras::BlockDetails;
+use views::HeaderView;
+use evm::Schedule;
+use io::{IoService, IoChannel};
+use service::ClientIoMessage;
+use self::message::*;
+use self::transition::TransitionHandler;
+use self::params::TendermintParams;
+use self::vote_collector::VoteCollector;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Step {
+	Propose,
+	Prevote,
+	Precommit,
+	Commit
+}
+
+impl Step {
+	pub fn is_pre(self) -> bool {
+		match self {
+			Step::Prevote | Step::Precommit => true,
+			_ => false,
+		}
+	}
+}
+
+pub type Height = usize;
+pub type Round = usize;
+pub type BlockHash = H256;
+
+/// Engine using `Tendermint` consensus algorithm, suitable for EVM chain.
+pub struct Tendermint {
+	params: CommonParams,
+	our_params: TendermintParams,
+	builtins: BTreeMap<Address, Builtin>,
+	step_service: IoService<Step>,
+	/// Address to be used as authority.
+	authority: RwLock<Address>,
+	/// Password used for signing messages.
+	password: RwLock<Option<String>>,
+	/// Blockchain height.
+	height: AtomicUsize,
+	/// Consensus round.
+	round: AtomicUsize,
+	/// Consensus step.
+	step: RwLock<Step>,
+	/// Vote accumulator.
+	votes: VoteCollector,
+	/// Channel for updating the sealing.
+	message_channel: Mutex<Option<IoChannel<ClientIoMessage>>>,
+	/// Used to sign messages and proposals.
+	account_provider: Mutex<Option<Arc<AccountProvider>>>,
+	/// Message for the last PoLC.
+	lock_change: RwLock<Option<ConsensusMessage>>,
+	/// Last lock round.
+	last_lock: AtomicUsize,
+	/// Bare hash of the proposed block, used for seal submission.
+	proposal: RwLock<Option<H256>>,
+}
+
+impl Tendermint {
+	/// Create a new instance of Tendermint engine
+	pub fn new(params: CommonParams, our_params: TendermintParams, builtins: BTreeMap<Address, Builtin>) -> Result<Arc<Self>, Error> {
+		let engine = Arc::new(
+			Tendermint {
+				params: params,
+				our_params: our_params,
+				builtins: builtins,
+				step_service: try!(IoService::<Step>::start()),
+				authority: RwLock::new(Address::default()),
+				password: RwLock::new(None),
+				height: AtomicUsize::new(1),
+				round: AtomicUsize::new(0),
+				step: RwLock::new(Step::Propose),
+				votes: VoteCollector::new(),
+				message_channel: Mutex::new(None),
+				account_provider: Mutex::new(None),
+				lock_change: RwLock::new(None),
+				last_lock: AtomicUsize::new(0),
+				proposal: RwLock::new(None),
+			});
+		let handler = TransitionHandler { engine: Arc::downgrade(&engine) };
+		try!(engine.step_service.register_handler(Arc::new(handler)));
+		Ok(engine)
+	}
+
+	fn update_sealing(&self) {
+		if let Some(ref channel) = *self.message_channel.lock() {
+			match channel.send(ClientIoMessage::UpdateSealing) {
+				Ok(_) => trace!(target: "poa", "UpdateSealing message sent."),
+				Err(err) => warn!(target: "poa", "Could not send a sealing message {}.", err),
+			}
+		}
+	}
+
+	fn submit_seal(&self, block_hash: H256, seal: Vec<Bytes>) {
+		if let Some(ref channel) = *self.message_channel.lock() {
+			match channel.send(ClientIoMessage::SubmitSeal(block_hash, seal)) {
+				Ok(_) => trace!(target: "poa", "SubmitSeal message sent."),
+				Err(err) => warn!(target: "poa", "Could not send a sealing message {}.", err),
+			}
+		}
+	}
+
+	fn broadcast_message(&self, message: Bytes) {
+		let channel = self.message_channel.lock().clone();
+		if let Some(ref channel) = channel {
+			match channel.send(ClientIoMessage::BroadcastMessage(message)) {
+				Ok(_) => trace!(target: "poa", "BroadcastMessage message sent."),
+				Err(err) => warn!(target: "poa", "broadcast_message: Could not send a sealing message {}.", err),
+			}
+		} else {
+			warn!(target: "poa", "broadcast_message: No IoChannel available.");
+		}
+	}
+
+	fn generate_message(&self, block_hash: Option<BlockHash>) -> Option<Bytes> {
+		if let Some(ref ap) = *self.account_provider.lock() {
+			let h = self.height.load(AtomicOrdering::SeqCst);
+			let r = self.round.load(AtomicOrdering::SeqCst);
+			let s = self.step.read();
+			let vote_info = message_info_rlp(h, r, *s, block_hash);
+			let authority = self.authority.read();
+			match ap.sign(*authority, self.password.read().clone(), vote_info.sha3()).map(Into::into) {
+				Ok(signature) => {
+					let message_rlp = message_full_rlp(&signature, &vote_info);
+					let message = ConsensusMessage::new(signature, h, r, *s, block_hash);
+					self.votes.vote(message.clone(), *authority);
+					debug!(target: "poa", "Generated {:?} as {}.", message, *authority);
+					self.handle_valid_message(&message);
+
+					Some(message_rlp)
+				},
+				Err(e) => {
+					trace!(target: "poa", "Could not sign the message {}", e);
+					None
+				},
+			}
+		} else {
+			warn!(target: "poa", "No AccountProvider available.");
+			None
+		}
+	}
+
+	fn generate_and_broadcast_message(&self, block_hash: Option<BlockHash>) {
+		if let Some(message) = self.generate_message(block_hash) {
+			self.broadcast_message(message);
+		}
+	}
+
+	/// Broadcast all messages since last issued block to get the peers up to speed.
+	fn broadcast_old_messages(&self) {
+		for m in self.votes.get_up_to(self.height.load(AtomicOrdering::SeqCst)).into_iter() {
+			self.broadcast_message(m);
+		}
+	}
+
+	fn to_next_height(&self, height: Height) {
+		let new_height = height + 1;
+		debug!(target: "poa", "Received a Commit, transitioning to height {}.", new_height);
+		self.last_lock.store(0, AtomicOrdering::SeqCst);
+		self.height.store(new_height, AtomicOrdering::SeqCst);
+		self.round.store(0, AtomicOrdering::SeqCst);
+		*self.lock_change.write() = None;
+	}
+
+	/// Use via step_service to transition steps.
+	fn to_step(&self, step: Step) {
+		if let Err(io_err) = self.step_service.send_message(step) {
+			warn!(target: "poa", "Could not proceed to step {}.", io_err)
+		}
+		*self.step.write() = step;
+		match step {
+			Step::Propose => {
+				*self.proposal.write() = None;
+				self.update_sealing()
+			},
+			Step::Prevote => {
+				let block_hash = match *self.lock_change.read() {
+					Some(ref m) if !self.should_unlock(m.round) => m.block_hash,
+					_ => self.proposal.read().clone(),
+				};
+				self.generate_and_broadcast_message(block_hash);
+			},
+			Step::Precommit => {
+				trace!(target: "poa", "to_step: Precommit.");
+				let block_hash = match *self.lock_change.read() {
+					Some(ref m) if self.is_round(m) && m.block_hash.is_some() => {
+						trace!(target: "poa", "Setting last lock: {}", m.round);
+						self.last_lock.store(m.round, AtomicOrdering::SeqCst);
+						m.block_hash
+					},
+					_ => None,
+				};
+				self.generate_and_broadcast_message(block_hash);
+			},
+			Step::Commit => {
+				trace!(target: "poa", "to_step: Commit.");
+				// Commit the block using a complete signature set.
+				let round = self.round.load(AtomicOrdering::SeqCst);
+				let height = self.height.load(AtomicOrdering::SeqCst);
+				if let Some(block_hash) = *self.proposal.read() {
+					// Generate seal and remove old votes.
+					if self.is_proposer(&*self.authority.read()).is_ok() {
+						if let Some(seal) = self.votes.seal_signatures(height, round, block_hash) {
+							trace!(target: "poa", "Collected seal: {:?}", seal);
+							let seal = vec![
+								::rlp::encode(&round).to_vec(),
+								::rlp::encode(&seal.proposal).to_vec(),
+								::rlp::encode(&seal.votes).to_vec()
+							];
+							self.submit_seal(block_hash, seal);
+							self.to_next_height(height);
+						} else {
+							warn!(target: "poa", "Not enough votes found!");
+						}
+					}
+				}
+			},
+		}
+	}
+
+	fn is_authority(&self, address: &Address) -> bool {
+		self.our_params.authorities.contains(address)
+	}
+
+	fn is_above_threshold(&self, n: usize) -> bool {
+		n > self.our_params.authority_n * 2/3
+	}
+
+	/// Check if address is a proposer for given round.
+	fn is_round_proposer(&self, height: Height, round: Round, address: &Address) -> Result<(), EngineError> {
+		let ref p = self.our_params;
+		let proposer_nonce = height + round;
+		trace!(target: "poa", "is_proposer: Proposer nonce: {}", proposer_nonce);
+		let proposer = p.authorities.get(proposer_nonce % p.authority_n).expect("There are authority_n authorities; taking number modulo authority_n gives number in authority_n range; qed");
+		if proposer == address {
+			Ok(())
+		} else {
+			Err(EngineError::NotProposer(Mismatch { expected: proposer.clone(), found: address.clone() }))
+		}
+	}
+
+	/// Check if address is the current proposer.
+	fn is_proposer(&self, address: &Address) -> Result<(), EngineError> {
+		self.is_round_proposer(self.height.load(AtomicOrdering::SeqCst), self.round.load(AtomicOrdering::SeqCst), address)
+	}
+
+	fn is_height(&self, message: &ConsensusMessage) -> bool {
+		message.is_height(self.height.load(AtomicOrdering::SeqCst)) 
+	}
+
+	fn is_round(&self, message: &ConsensusMessage) -> bool {
+		message.is_round(self.height.load(AtomicOrdering::SeqCst), self.round.load(AtomicOrdering::SeqCst)) 
+	}
+
+	fn increment_round(&self, n: Round) {
+		trace!(target: "poa", "increment_round: New round.");
+		self.round.fetch_add(n, AtomicOrdering::SeqCst);
+	}
+
+	fn should_unlock(&self, lock_change_round: Round) -> bool { 
+		self.last_lock.load(AtomicOrdering::SeqCst) < lock_change_round
+			&& lock_change_round < self.round.load(AtomicOrdering::SeqCst)
+	}
+
+
+	fn has_enough_any_votes(&self) -> bool {
+		let step_votes = self.votes.count_step_votes(self.height.load(AtomicOrdering::SeqCst), self.round.load(AtomicOrdering::SeqCst), *self.step.read());
+		self.is_above_threshold(step_votes)
+	}
+
+	fn has_enough_future_step_votes(&self, message: &ConsensusMessage) -> bool {
+		if message.round > self.round.load(AtomicOrdering::SeqCst) {
+			let step_votes = self.votes.count_step_votes(message.height, message.round, message.step);
+			self.is_above_threshold(step_votes)	
+		} else {
+			false
+		}
+	}
+
+	fn has_enough_aligned_votes(&self, message: &ConsensusMessage) -> bool {
+		let aligned_count = self.votes.count_aligned_votes(&message);
+		self.is_above_threshold(aligned_count)
+	}
+
+	fn handle_valid_message(&self, message: &ConsensusMessage) {
+		let is_newer_than_lock = match *self.lock_change.read() {
+			Some(ref lock) => message > lock,
+			None => true,
+		};
+		let lock_change = is_newer_than_lock
+			&& message.step == Step::Prevote
+			&& message.block_hash.is_some()
+			&& self.has_enough_aligned_votes(message);
+		if lock_change {
+			trace!(target: "poa", "handle_valid_message: Lock change.");
+			*self.lock_change.write()	= Some(message.clone());
+		}
+		// Check if it can affect the step transition.
+		if self.is_height(message) {
+			let next_step = match *self.step.read() {
+				Step::Precommit if self.has_enough_aligned_votes(message) => {
+					if message.block_hash.is_none() {
+						self.increment_round(1);
+						Some(Step::Propose)
+					} else {
+						Some(Step::Commit)
+					}
+				},
+				Step::Precommit if self.has_enough_future_step_votes(message) => {
+					self.increment_round(message.round - self.round.load(AtomicOrdering::SeqCst));
+					Some(Step::Precommit)
+				},
+				// Avoid counting twice.
+				Step::Prevote if lock_change => Some(Step::Precommit),
+				Step::Prevote if self.has_enough_aligned_votes(message) => Some(Step::Precommit),
+				Step::Prevote if self.has_enough_future_step_votes(message) => {
+					self.increment_round(message.round - self.round.load(AtomicOrdering::SeqCst));
+					Some(Step::Prevote)
+				},
+				_ => None,
+			};
+
+			if let Some(step) = next_step {
+				trace!(target: "poa", "Transition to {:?} triggered.", step);
+				self.to_step(step);
+			}
+		}
+	}
+}
+
+impl Engine for Tendermint {
+	fn name(&self) -> &str { "Tendermint" }
+	fn version(&self) -> SemanticVersion { SemanticVersion::new(1, 0, 0) }
+	/// (consensus round, proposal signature, authority signatures)
+	fn seal_fields(&self) -> usize { 3 }
+
+	fn params(&self) -> &CommonParams { &self.params }
+	fn builtins(&self) -> &BTreeMap<Address, Builtin> { &self.builtins }
+
+	fn maximum_uncle_count(&self) -> usize { 0 }
+	fn maximum_uncle_age(&self) -> usize { 0 }
+
+	/// Additional engine-specific information for the user/developer concerning `header`.
+	fn extra_info(&self, header: &Header) -> BTreeMap<String, String> {
+		let message = ConsensusMessage::new_proposal(header).expect("Invalid header.");
+		map![
+			"signature".into() => message.signature.to_string(),
+			"height".into() => message.height.to_string(),
+			"round".into() => message.round.to_string(),
+			"block_hash".into() => message.block_hash.as_ref().map(ToString::to_string).unwrap_or("".into())
+		]
+	}
+
+	fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
+		Schedule::new_post_eip150(usize::max_value(), true, true, true)
+	}
+
+	fn populate_from_parent(&self, header: &mut Header, parent: &Header, gas_floor_target: U256, _gas_ceil_target: U256) {
+		header.set_difficulty(parent.difficulty().clone());
+		header.set_gas_limit({
+			let gas_limit = parent.gas_limit().clone();
+			let bound_divisor = self.our_params.gas_limit_bound_divisor;
+			if gas_limit < gas_floor_target {
+				min(gas_floor_target, gas_limit + gas_limit / bound_divisor - 1.into())
+			} else {
+				max(gas_floor_target, gas_limit - gas_limit / bound_divisor + 1.into())
+			}
+		});
+	}
+
+	/// Should this node participate.
+	fn is_sealer(&self, address: &Address) -> Option<bool> {
+		Some(self.is_authority(address))
+	}
+
+	/// Attempt to seal generate a proposal seal.
+	fn generate_seal(&self, block: &ExecutedBlock) -> Seal {
+		if let Some(ref ap) = *self.account_provider.lock() {
+			let header = block.header();
+			let author = header.author();
+			// Only proposer can generate seal if None was generated.
+			if self.is_proposer(author).is_err() || self.proposal.read().is_some() {
+				return Seal::None;
+			}
+
+			let height = header.number() as Height;
+			let round = self.round.load(AtomicOrdering::SeqCst);
+			let bh = Some(header.bare_hash());
+			let vote_info = message_info_rlp(height, round, Step::Propose, bh.clone());
+			if let Ok(signature) = ap.sign(*author, self.password.read().clone(), vote_info.sha3()).map(H520::from) {
+				// Insert Propose vote.
+				debug!(target: "poa", "Submitting proposal {} at height {} round {}.", header.bare_hash(), height, round);
+				self.votes.vote(ConsensusMessage::new(signature, height, round, Step::Propose, bh), *author);
+				// Remember proposal for later seal submission.
+				*self.proposal.write() = bh;
+				Seal::Proposal(vec![
+					::rlp::encode(&round).to_vec(),
+					::rlp::encode(&signature).to_vec(),
+					::rlp::EMPTY_LIST_RLP.to_vec()
+				])
+			} else {
+				warn!(target: "poa", "generate_seal: FAIL: accounts secret key unavailable");
+				Seal::None
+			}
+		} else {
+			warn!(target: "poa", "generate_seal: FAIL: accounts not provided");
+			Seal::None
+		}
+	}
+
+	fn handle_message(&self, rlp: &[u8]) -> Result<(), Error> {
+		let rlp = UntrustedRlp::new(rlp);
+		let message: ConsensusMessage = try!(rlp.as_val());
+		if !self.votes.is_old_or_known(&message) {
+			let sender = public_to_address(&try!(recover(&message.signature.into(), &try!(rlp.at(1)).as_raw().sha3())));
+			if !self.is_authority(&sender) {
+				try!(Err(EngineError::NotAuthorized(sender)));
+			}
+			self.broadcast_message(rlp.as_raw().to_vec());
+			trace!(target: "poa", "Handling a valid {:?} from {}.", message, sender);
+			self.votes.vote(message.clone(), sender);
+			self.handle_valid_message(&message);
+		}
+		Ok(())
+	}
+
+	fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
+		let seal_length = header.seal().len();
+		if seal_length == self.seal_fields() {
+			let signatures_len = header.seal()[2].len();
+			if signatures_len >= 1 {
+				Ok(())
+			} else {
+				Err(From::from(EngineError::BadSealFieldSize(OutOfBounds {
+					min: Some(1),
+					max: None,
+					found: signatures_len
+				})))
+			}
+		} else {
+			Err(From::from(BlockError::InvalidSealArity(
+				Mismatch { expected: self.seal_fields(), found: seal_length }
+			)))
+		}
+
+	}
+
+	fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
+		let proposal = try!(ConsensusMessage::new_proposal(header));	
+		let proposer = try!(proposal.verify());
+		if !self.is_authority(&proposer) {
+			try!(Err(EngineError::NotAuthorized(proposer)))
+		}
+
+		let precommit_hash = proposal.precommit_hash();
+		let ref signatures_field = header.seal()[2];
+		let mut signature_count = 0;
+		let mut origins = HashSet::new();
+		for rlp in UntrustedRlp::new(signatures_field).iter() {
+			let precommit: ConsensusMessage = ConsensusMessage::new_commit(&proposal, try!(rlp.as_val()));
+			let address = match self.votes.get(&precommit) {
+				Some(a) => a,
+				None => public_to_address(&try!(recover(&precommit.signature.into(), &precommit_hash))),
+			};
+			if !self.our_params.authorities.contains(&address) {
+				try!(Err(EngineError::NotAuthorized(address.to_owned())))
+			}
+
+			if origins.insert(address) {
+				signature_count += 1;
+			} else {
+				warn!(target: "poa", "verify_block_unordered: Duplicate signature from {} on the seal.", address);
+				try!(Err(BlockError::InvalidSeal));
+			}
+		}
+
+		// Check if its a proposal if there is not enough precommits.
+		if !self.is_above_threshold(signature_count) {
+			let signatures_len = signatures_field.len();
+			// Proposal has to have an empty signature list.
+			if signatures_len != 1 {
+				try!(Err(EngineError::BadSealFieldSize(OutOfBounds {
+					min: Some(1),
+					max: Some(1),
+					found: signatures_len
+				})));
+			}
+			try!(self.is_round_proposer(proposal.height, proposal.round, &proposer));
+		}
+		Ok(())
+	}
+
+	fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
+		if header.number() == 0 {
+			try!(Err(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() })));
+		}
+
+		let gas_limit_divisor = self.our_params.gas_limit_bound_divisor;
+		let min_gas = parent.gas_limit().clone() - parent.gas_limit().clone() / gas_limit_divisor;
+		let max_gas = parent.gas_limit().clone() + parent.gas_limit().clone() / gas_limit_divisor;
+		if header.gas_limit() <= &min_gas || header.gas_limit() >= &max_gas {
+			try!(Err(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() })));
+		}
+
+		Ok(())
+	}
+
+	fn verify_transaction_basic(&self, t: &SignedTransaction, _header: &Header) -> Result<(), Error> {
+		try!(t.check_low_s());
+		Ok(())
+	}
+
+	fn verify_transaction(&self, t: &SignedTransaction, _header: &Header) -> Result<(), Error> {
+		t.sender().map(|_|()) // Perform EC recovery and cache sender
+	}
+
+	fn set_signer(&self, address: Address, password: String) {
+		*self.authority.write()	= address;
+		*self.password.write() = Some(password);
+		self.to_step(Step::Propose);
+	}
+
+	fn stop(&self) {
+		self.step_service.stop()
+	}
+
+	fn is_new_best_block(&self, _best_total_difficulty: U256, best_header: HeaderView, _parent_details: &BlockDetails, new_header: &HeaderView) -> bool {
+		let new_number = new_header.number();
+		let best_number = best_header.number();
+		trace!(target: "poa", "new_header: {}, best_header: {}", new_number, best_number);
+		if new_number != best_number {
+			new_number > best_number
+		} else {
+			let new_seal = new_header.seal();
+			let best_seal = best_header.seal();
+			let new_signatures = new_seal.get(2).expect("Tendermint seal should have three elements.").len();
+			let best_signatures = best_seal.get(2).expect("Tendermint seal should have three elements.").len();
+			if new_signatures > best_signatures {
+				true
+			} else {
+				let new_round: Round = ::rlp::Rlp::new(&new_seal.get(0).expect("Tendermint seal should have three elements.")).as_val();
+				let best_round: Round = ::rlp::Rlp::new(&best_seal.get(0).expect("Tendermint seal should have three elements.")).as_val();
+				new_round > best_round
+			}
+		}
+	}
+
+	fn is_proposal(&self, header: &Header) -> bool {
+		let signatures_len = header.seal()[2].len();
+		// Signatures have to be an empty list rlp.
+		let proposal = ConsensusMessage::new_proposal(header).expect("block went through full verification; this Engine verifies new_proposal creation; qed");
+		if signatures_len != 1 {
+			// New Commit received, skip to next height.
+			trace!(target: "poa", "Received a commit for height {}, round {}.", proposal.height, proposal.round);
+			self.to_next_height(proposal.height);
+			return false;
+		}
+		let proposer = proposal.verify().expect("block went through full verification; this Engine tries verify; qed");
+		debug!(target: "poa", "Received a new proposal for height {}, round {} from {}.", proposal.height, proposal.round, proposer);
+		if self.is_round(&proposal) {
+			*self.proposal.write() = proposal.block_hash.clone();
+		}
+		self.votes.vote(proposal, proposer);
+		true
+	}
+
+	/// Equivalent to a timeout: to be used for tests.
+	fn step(&self) {
+		let next_step = match *self.step.read() {
+			Step::Propose => {
+				trace!(target: "poa", "Propose timeout.");
+				Step::Prevote
+			},
+			Step::Prevote if self.has_enough_any_votes() => {
+				trace!(target: "poa", "Prevote timeout.");
+				Step::Precommit
+			},
+			Step::Prevote => {
+				trace!(target: "poa", "Prevote timeout without enough votes.");
+				self.broadcast_old_messages();
+				Step::Prevote
+			},
+			Step::Precommit if self.has_enough_any_votes() => {
+				trace!(target: "poa", "Precommit timeout.");
+				self.increment_round(1);
+				Step::Propose
+			},
+			Step::Precommit => {
+				trace!(target: "poa", "Precommit timeout without enough votes.");
+				self.broadcast_old_messages();
+				Step::Precommit
+			},
+			Step::Commit => {
+				trace!(target: "poa", "Commit timeout.");
+				Step::Propose
+			},
+		};
+		self.to_step(next_step);
+	}
+
+	fn register_message_channel(&self, message_channel: IoChannel<ClientIoMessage>) {
+		trace!(target: "poa", "Register the IoChannel.");
+		*self.message_channel.lock() = Some(message_channel);
+	}
+
+	fn register_account_provider(&self, account_provider: Arc<AccountProvider>) {
+		*self.account_provider.lock() = Some(account_provider);
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use util::*;
+	use util::trie::TrieSpec;
+	use io::{IoContext, IoHandler};
+	use block::*;
+	use error::{Error, BlockError};
+	use header::Header;
+	use env_info::EnvInfo;
+	use tests::helpers::*;
+	use account_provider::AccountProvider;
+	use io::IoService;
+	use service::ClientIoMessage;
+	use spec::Spec;
+	use engines::{Engine, EngineError, Seal};
+	use super::*;
+	use super::message::*;
+
+	/// Accounts inserted with "0" and "1" are authorities. First proposer is "0".
+	fn setup() -> (Spec, Arc<AccountProvider>) {
+		let tap = Arc::new(AccountProvider::transient_provider());
+		let spec = Spec::new_test_tendermint();
+		spec.engine.register_account_provider(tap.clone());
+		(spec, tap)
+	}
+
+	fn propose_default(spec: &Spec, proposer: Address) -> (LockedBlock, Vec<Bytes>) {
+		let mut db_result = get_temp_state_db();
+		let mut db = db_result.take();
+		spec.ensure_db_good(&mut db, &TrieFactory::new(TrieSpec::Secure)).unwrap();
+		let genesis_header = spec.genesis_header();
+		let last_hashes = Arc::new(vec![genesis_header.hash()]);
+		let b = OpenBlock::new(spec.engine.as_ref(), Default::default(), false, db.boxed_clone(), &genesis_header, last_hashes, proposer, (3141562.into(), 31415620.into()), vec![]).unwrap();
+		let b = b.close_and_lock();
+		if let Seal::Proposal(seal) = spec.engine.generate_seal(b.block()) {
+			(b, seal)
+		} else {
+			panic!()
+		}
+	}
+
+	fn vote<F>(engine: &Arc<Engine>, signer: F, height: usize, round: usize, step: Step, block_hash: Option<H256>) -> Bytes where F: FnOnce(H256) -> Result<H520, ::account_provider::Error> {
+		let mi = message_info_rlp(height, round, step, block_hash);
+		let m = message_full_rlp(&signer(mi.sha3()).unwrap().into(), &mi);
+		engine.handle_message(&m).unwrap();
+		m
+	}
+
+	fn proposal_seal(tap: &Arc<AccountProvider>, header: &Header, round: Round) -> Vec<Bytes> {
+		let author = header.author();
+		let vote_info = message_info_rlp(header.number() as Height, round, Step::Propose, Some(header.bare_hash()));
+		let signature = tap.sign(*author, None, vote_info.sha3()).unwrap();
+		vec![
+			::rlp::encode(&round).to_vec(),
+			::rlp::encode(&H520::from(signature)).to_vec(),
+			::rlp::EMPTY_LIST_RLP.to_vec()
+		]
+	}
+
+	fn precommit_signatures(tap: &Arc<AccountProvider>, height: Height, round: Round, bare_hash: Option<H256>, v1: H160, v2: H160) -> Bytes {
+		let vote_info = message_info_rlp(height, round, Step::Precommit, bare_hash);
+		::rlp::encode(&vec![
+			H520::from(tap.sign(v1, None, vote_info.sha3()).unwrap()),
+			H520::from(tap.sign(v2, None, vote_info.sha3()).unwrap())
+		]).to_vec()
+	}
+
+	fn insert_and_unlock(tap: &Arc<AccountProvider>, acc: &str) -> Address {
+		let addr = tap.insert_account(acc.sha3(), acc).unwrap();
+		tap.unlock_account_permanently(addr, acc.into()).unwrap();
+		addr
+	}
+
+	fn insert_and_register(tap: &Arc<AccountProvider>, engine: &Arc<Engine>, acc: &str) -> Address {
+		let addr = insert_and_unlock(tap, acc);
+		engine.set_signer(addr.clone(), acc.into());
+		addr
+	}
+
+	struct TestIo {
+		received: RwLock<Vec<ClientIoMessage>>
+	}
+
+	impl TestIo {
+		fn new() -> Arc<Self> { Arc::new(TestIo { received: RwLock::new(Vec::new()) }) }
+	}
+
+	impl IoHandler<ClientIoMessage> for TestIo {
+		fn message(&self, _io: &IoContext<ClientIoMessage>, net_message: &ClientIoMessage) {
+			self.received.write().push(net_message.clone());
+		}
+	}
+
+	#[test]
+	fn has_valid_metadata() {
+		let engine = Spec::new_test_tendermint().engine;
+		assert!(!engine.name().is_empty());
+		assert!(engine.version().major >= 1);
+	}
+
+	#[test]
+	fn can_return_schedule() {
+		let engine = Spec::new_test_tendermint().engine;
+		let schedule = engine.schedule(&EnvInfo {
+			number: 10000000,
+			author: 0.into(),
+			timestamp: 0,
+			difficulty: 0.into(),
+			last_hashes: Arc::new(vec![]),
+			gas_used: 0.into(),
+			gas_limit: 0.into(),
+		});
+
+		assert!(schedule.stack_limit > 0);
+	}
+
+	#[test]
+	fn verification_fails_on_short_seal() {
+		let engine = Spec::new_test_tendermint().engine;
+		let header = Header::default();
+
+		let verify_result = engine.verify_block_basic(&header, None);
+
+		match verify_result {
+			Err(Error::Block(BlockError::InvalidSealArity(_))) => {},
+			Err(_) => { panic!("should be block seal-arity mismatch error (got {:?})", verify_result); },
+			_ => { panic!("Should be error, got Ok"); },
+		}
+	}
+
+	#[test]
+	fn allows_correct_proposer() {
+		let (spec, tap) = setup();
+		let engine = spec.engine;
+
+		let mut header = Header::default();
+		let validator = insert_and_unlock(&tap, "0");
+		header.set_author(validator);
+		let seal = proposal_seal(&tap, &header, 0);
+		header.set_seal(seal);
+		// Good proposer.
+		assert!(engine.verify_block_unordered(&header.clone(), None).is_ok());
+
+		let validator = insert_and_unlock(&tap, "1");
+		header.set_author(validator);
+		let seal = proposal_seal(&tap, &header, 0);
+		header.set_seal(seal);
+		// Bad proposer.
+		match engine.verify_block_unordered(&header, None) {
+			Err(Error::Engine(EngineError::NotProposer(_))) => {},
+			_ => panic!(),
+		}
+
+		let random = insert_and_unlock(&tap, "101");
+		header.set_author(random);
+		let seal = proposal_seal(&tap, &header, 0);
+		header.set_seal(seal);
+		// Not authority.
+		match engine.verify_block_unordered(&header, None) {
+			Err(Error::Engine(EngineError::NotAuthorized(_))) => {},
+			_ => panic!(),
+		};
+		engine.stop();
+	}
+
+	#[test]
+	fn seal_signatures_checking() {
+		let (spec, tap) = setup();
+		let engine = spec.engine;
+
+		let mut header = Header::default();
+		let proposer = insert_and_unlock(&tap, "1");
+		header.set_author(proposer);
+		let mut seal = proposal_seal(&tap, &header, 0);
+
+		let vote_info = message_info_rlp(0, 0, Step::Precommit, Some(header.bare_hash()));
+		let signature1 = tap.sign(proposer, None, vote_info.sha3()).unwrap();
+
+		seal[2] = ::rlp::encode(&vec![H520::from(signature1.clone())]).to_vec();
+		header.set_seal(seal.clone());
+
+		// One good signature is not enough.
+		match engine.verify_block_unordered(&header, None) {
+			Err(Error::Engine(EngineError::BadSealFieldSize(_))) => {},
+			_ => panic!(),
+		}
+
+		let voter = insert_and_unlock(&tap, "0");
+		let signature0 = tap.sign(voter, None, vote_info.sha3()).unwrap();
+
+		seal[2] = ::rlp::encode(&vec![H520::from(signature1.clone()), H520::from(signature0.clone())]).to_vec();
+		header.set_seal(seal.clone());
+
+		assert!(engine.verify_block_unordered(&header, None).is_ok());
+
+		let bad_voter = insert_and_unlock(&tap, "101");
+		let bad_signature = tap.sign(bad_voter, None, vote_info.sha3()).unwrap();
+
+		seal[2] = ::rlp::encode(&vec![H520::from(signature1), H520::from(bad_signature)]).to_vec();
+		header.set_seal(seal);
+
+		// One good and one bad signature.
+		match engine.verify_block_unordered(&header, None) {
+			Err(Error::Engine(EngineError::NotAuthorized(_))) => {},
+			_ => panic!(),
+		};
+		engine.stop();
+	}
+
+	#[test]
+	fn can_generate_seal() {
+		let (spec, tap) = setup();
+
+		let proposer = insert_and_register(&tap, &spec.engine, "1");
+
+		let (b, seal) = propose_default(&spec, proposer);
+		assert!(b.try_seal(spec.engine.as_ref(), seal).is_ok());
+		spec.engine.stop();
+	}
+
+	#[test]
+	fn can_recognize_proposal() {
+		let (spec, tap) = setup();
+
+		let proposer = insert_and_register(&tap, &spec.engine, "1");
+
+		let (b, seal) = propose_default(&spec, proposer);
+		let sealed = b.seal(spec.engine.as_ref(), seal).unwrap();
+		assert!(spec.engine.is_proposal(sealed.header()));
+		spec.engine.stop();
+	}
+
+	#[test]
+	fn relays_messages() {
+		let (spec, tap) = setup();
+		let engine = spec.engine.clone();
+		let mut db_result = get_temp_state_db();
+		let mut db = db_result.take();
+		spec.ensure_db_good(&mut db, &TrieFactory::new(TrieSpec::Secure)).unwrap();
+		
+		let v0 = insert_and_register(&tap, &engine, "0");
+		let v1 = insert_and_register(&tap, &engine, "1");
+
+		let h = 0;
+		let r = 0;
+
+		// Propose
+		let (b, _) = propose_default(&spec, v1.clone());
+		let proposal = Some(b.header().bare_hash());
+
+		// Register IoHandler remembers messages.
+		let io_service = IoService::<ClientIoMessage>::start().unwrap();
+		let test_io = TestIo::new();
+		io_service.register_handler(test_io.clone()).unwrap();
+		engine.register_message_channel(io_service.channel());
+
+		let prevote_current = vote(&engine, |mh| tap.sign(v0, None, mh).map(H520::from), h, r, Step::Prevote, proposal);
+
+		let precommit_current = vote(&engine, |mh| tap.sign(v0, None, mh).map(H520::from), h, r, Step::Precommit, proposal);
+
+		let prevote_future = vote(&engine, |mh| tap.sign(v0, None, mh).map(H520::from), h + 1, r, Step::Prevote, proposal);
+		
+		// Wait a bit for async stuff.
+		::std::thread::sleep(::std::time::Duration::from_millis(500));
+
+		// Relays all valid present and future messages.
+		assert!(test_io.received.read().contains(&ClientIoMessage::BroadcastMessage(prevote_current)));
+		assert!(test_io.received.read().contains(&ClientIoMessage::BroadcastMessage(precommit_current)));
+		assert!(test_io.received.read().contains(&ClientIoMessage::BroadcastMessage(prevote_future)));
+		engine.stop();
+	}
+
+	#[test]
+	fn seal_submission() {
+		let (spec, tap) = setup();
+		let engine = spec.engine.clone();
+		let mut db_result = get_temp_state_db();
+		let mut db = db_result.take();
+		spec.ensure_db_good(&mut db, &TrieFactory::new(TrieSpec::Secure)).unwrap();
+		
+		let v0 = insert_and_register(&tap, &engine, "0");
+		let v1 = insert_and_register(&tap, &engine, "1");
+
+		let h = 1;
+		let r = 0;
+
+		// Register IoHandler remembers messages.
+		let test_io = TestIo::new();
+		let io_service = IoService::<ClientIoMessage>::start().unwrap();
+		io_service.register_handler(test_io.clone()).unwrap();
+		engine.register_message_channel(io_service.channel());
+
+		// Propose
+		let (b, mut seal) = propose_default(&spec, v1.clone());
+		let proposal = Some(b.header().bare_hash());
+		engine.step();
+
+		// Prevote.
+		vote(&engine, |mh| tap.sign(v1, None, mh).map(H520::from), h, r, Step::Prevote, proposal);
+		vote(&engine, |mh| tap.sign(v0, None, mh).map(H520::from), h, r, Step::Prevote, proposal);
+		vote(&engine, |mh| tap.sign(v1, None, mh).map(H520::from), h, r, Step::Precommit, proposal);
+		vote(&engine, |mh| tap.sign(v0, None, mh).map(H520::from), h, r, Step::Precommit, proposal);
+
+		// Wait a bit for async stuff.
+		::std::thread::sleep(::std::time::Duration::from_millis(500));
+
+		seal[2] = precommit_signatures(&tap, h, r, Some(b.header().bare_hash()), v1, v0);
+		assert!(test_io.received.read().contains(&ClientIoMessage::SubmitSeal(proposal.unwrap(), seal)));
+		engine.stop();
+	}
+}

ethcore/src/engines/tendermint/params.rs

@@ -0,0 +1,72 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tendermint specific parameters.
+
+use ethjson;
+use super::transition::TendermintTimeouts;
+use util::{Address, U256};
+use time::Duration;
+
+/// `Tendermint` params.
+#[derive(Debug, Clone)]
+pub struct TendermintParams {
+	/// Gas limit divisor.
+	pub gas_limit_bound_divisor: U256,
+	/// List of authorities.
+	pub authorities: Vec<Address>,
+	/// Number of authorities.
+	pub authority_n: usize,
+	/// Timeout durations for different steps.
+	pub timeouts: TendermintTimeouts,
+}
+
+impl Default for TendermintParams {
+	fn default() -> Self {
+		let authorities = vec!["0x7d577a597b2742b498cb5cf0c26cdcd726d39e6e".into(), "0x82a978b3f5962a5b0957d9ee9eef472ee55b42f1".into()];
+		let val_n = authorities.len();
+		TendermintParams {
+			gas_limit_bound_divisor: 0x0400.into(),
+			authorities: authorities,
+			authority_n: val_n,
+			timeouts: TendermintTimeouts::default(),
+		}
+	}
+}
+
+fn to_duration(ms: ethjson::uint::Uint) -> Duration {
+	let ms: usize = ms.into();
+	Duration::milliseconds(ms as i64)
+}
+
+impl From<ethjson::spec::TendermintParams> for TendermintParams {
+	fn from(p: ethjson::spec::TendermintParams) -> Self {
+		let val: Vec<_> = p.authorities.into_iter().map(Into::into).collect();
+		let val_n = val.len();
+		let dt = TendermintTimeouts::default();
+		TendermintParams {
+			gas_limit_bound_divisor: p.gas_limit_bound_divisor.into(),
+			authorities: val,
+			authority_n: val_n,
+			timeouts: TendermintTimeouts {
+				propose: p.timeout_propose.map_or(dt.propose, to_duration),
+				prevote: p.timeout_prevote.map_or(dt.prevote, to_duration),
+				precommit: p.timeout_precommit.map_or(dt.precommit, to_duration),
+				commit: p.timeout_commit.map_or(dt.commit, to_duration),
+			},
+		}
+	}
+}

ethcore/src/engines/tendermint/transition.rs

@@ -0,0 +1,96 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tendermint timeout handling.
+
+use std::sync::Weak;
+use time::Duration;
+use io::{IoContext, IoHandler, TimerToken};
+use super::{Tendermint, Step};
+use engines::Engine;
+
+pub struct TransitionHandler {
+	pub engine: Weak<Tendermint>,
+}
+
+/// Base timeout of each step in ms.
+#[derive(Debug, Clone)]
+pub struct TendermintTimeouts {
+	pub propose: Duration,
+	pub prevote: Duration,
+	pub precommit: Duration,
+	pub commit: Duration,
+}
+
+impl TendermintTimeouts {
+	pub fn for_step(&self, step: Step) -> Duration {
+		match step {
+			Step::Propose => self.propose,
+			Step::Prevote => self.prevote,
+			Step::Precommit => self.precommit,
+			Step::Commit => self.commit,
+		}
+	}
+}
+
+impl Default for TendermintTimeouts {
+	fn default() -> Self {
+		TendermintTimeouts {
+			propose: Duration::milliseconds(10000),
+			prevote: Duration::milliseconds(10000),
+			precommit: Duration::milliseconds(10000),
+			commit: Duration::milliseconds(10000),
+		}
+	}
+}
+
+/// Timer token representing the consensus step timeouts.
+pub const ENGINE_TIMEOUT_TOKEN: TimerToken = 23;
+
+fn set_timeout(io: &IoContext<Step>, timeout: Duration) {
+	io.register_timer_once(ENGINE_TIMEOUT_TOKEN, timeout.num_milliseconds() as u64)
+		.unwrap_or_else(|e| warn!(target: "poa", "Failed to set consensus step timeout: {}.", e))
+}
+
+impl IoHandler<Step> for TransitionHandler {
+	fn initialize(&self, io: &IoContext<Step>) {
+		if let Some(engine) = self.engine.upgrade() {
+			set_timeout(io, engine.our_params.timeouts.propose)
+		}
+	}
+
+	fn timeout(&self, _io: &IoContext<Step>, timer: TimerToken) {
+		if timer == ENGINE_TIMEOUT_TOKEN {
+			if let Some(engine) = self.engine.upgrade() {
+				engine.step();
+			}
+		}
+	}
+
+	fn message(&self, io: &IoContext<Step>, next_step: &Step) {
+		if let Some(engine) = self.engine.upgrade() {
+			if let Err(io_err) = io.clear_timer(ENGINE_TIMEOUT_TOKEN) {
+				warn!(target: "poa", "Could not remove consensus timer {}.", io_err)
+			}
+			match *next_step {
+				Step::Propose => set_timeout(io, engine.our_params.timeouts.propose),
+				Step::Prevote => set_timeout(io, engine.our_params.timeouts.prevote),
+				Step::Precommit => set_timeout(io, engine.our_params.timeouts.precommit),
+				Step::Commit => set_timeout(io, engine.our_params.timeouts.commit),
+			};
+		}
+	}
+}

ethcore/src/engines/tendermint/vote_collector.rs

@@ -0,0 +1,272 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Collects votes on hashes at each height and round.
+
+use util::*;
+use super::message::ConsensusMessage;
+use super::{Height, Round, Step};
+
+#[derive(Debug)]
+pub struct VoteCollector {
+	/// Storing all Proposals, Prevotes and Precommits.
+	votes: RwLock<BTreeMap<ConsensusMessage, Address>>,
+}
+
+#[derive(Debug)]
+pub struct SealSignatures {
+	pub proposal: H520,
+	pub votes: Vec<H520>,
+}
+
+impl PartialEq for SealSignatures {
+	fn eq(&self, other: &SealSignatures) -> bool {
+		self.proposal == other.proposal
+			&& self.votes.iter().collect::<HashSet<_>>() == other.votes.iter().collect::<HashSet<_>>()
+	}
+}
+
+impl Eq for SealSignatures {}
+
+impl VoteCollector {
+	pub fn new() -> VoteCollector {
+		let mut collector = BTreeMap::new();
+		// Insert dummy message to fulfill invariant: "only messages newer than the oldest are inserted".
+		collector.insert(ConsensusMessage {
+			signature: H520::default(),
+			height: 0,
+			round: 0,
+			step: Step::Propose,
+			block_hash: None
+		},
+		Address::default());
+		VoteCollector { votes: RwLock::new(collector) }
+	}
+
+	/// Insert vote if it is newer than the oldest one.
+	pub fn vote(&self, message: ConsensusMessage, voter: Address) -> Option<Address> {
+		self.votes.write().insert(message, voter)
+	}
+
+	pub fn is_old_or_known(&self, message: &ConsensusMessage) -> bool {
+		self.votes.read().get(message).map_or(false, |a| {
+			trace!(target: "poa", "Known message from {}: {:?}.", a, message);
+			true
+		}) || {
+			let guard = self.votes.read();
+			let is_old = guard.keys().next().map_or(true, |oldest| message <= oldest);
+			if is_old { trace!(target: "poa", "Old message {:?}.", message); }
+			is_old
+		}
+	}
+
+	/// Throws out messages older than message, leaves message as marker for the oldest.
+	pub fn throw_out_old(&self, message: &ConsensusMessage) {
+		let mut guard = self.votes.write();
+		let new_collector = guard.split_off(message);
+		*guard = new_collector;
+	}
+
+	pub fn seal_signatures(&self, height: Height, round: Round, block_hash: H256) -> Option<SealSignatures> {
+		let bh = Some(block_hash);
+		let (proposal, votes) = {
+			let guard = self.votes.read();
+			let mut current_signatures = guard.keys().skip_while(|m| !m.is_block_hash(height, round, Step::Propose, bh));
+			let proposal = current_signatures.next().cloned();
+			let votes = current_signatures
+					.skip_while(|m| !m.is_block_hash(height, round, Step::Precommit, bh))
+					.filter(|m| m.is_block_hash(height, round, Step::Precommit, bh))
+					.cloned()
+					.collect::<Vec<_>>();
+			(proposal, votes)
+		};
+		if votes.is_empty() {
+			return None;
+		}
+		// Remove messages that are no longer relevant.
+		votes.last().map(|m| self.throw_out_old(m));
+		let mut votes_vec: Vec<_> = votes.into_iter().map(|m| m.signature).collect();
+		votes_vec.sort();
+		proposal.map(|p| SealSignatures {
+			proposal: p.signature,
+			votes: votes_vec,
+		})
+	}
+
+	pub fn count_aligned_votes(&self, message: &ConsensusMessage) -> usize {
+		let guard = self.votes.read();
+		guard.keys()
+			.skip_while(|m| !m.is_aligned(message))
+			// sorted by signature so might not be continuous
+			.filter(|m| m.is_aligned(message))
+			.count()
+	}
+
+	pub fn count_step_votes(&self, height: Height, round: Round, step: Step) -> usize {
+		let guard = self.votes.read();
+		let current = guard.iter().skip_while(|&(m, _)| !m.is_step(height, round, step));
+		let mut origins = HashSet::new();
+		let mut n = 0;
+		for (message, origin) in current {
+			if message.is_step(height, round, step) {
+				if origins.insert(origin) {
+					n += 1;
+				} else {
+					warn!("count_step_votes: Authority {} has cast multiple step votes, this indicates malicious behaviour.", origin)
+				}
+			}
+		}
+		n
+	}
+
+	pub fn get_up_to(&self, height: Height) -> Vec<Bytes> {
+		let guard = self.votes.read();
+		guard
+			.keys()
+			.filter(|m| m.step.is_pre())
+			.take_while(|m| m.height <= height)
+			.map(|m| ::rlp::encode(m).to_vec())
+			.collect()
+	}
+
+	pub fn get(&self, message: &ConsensusMessage) -> Option<Address> {
+		let guard = self.votes.read();
+		guard.get(message).cloned()
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use util::*;
+	use super::*;
+	use super::super::{Height, Round, BlockHash, Step};
+	use super::super::message::ConsensusMessage;
+
+	fn random_vote(collector: &VoteCollector, signature: H520, h: Height, r: Round, step: Step, block_hash: Option<BlockHash>) -> Option<H160> {
+		full_vote(collector, signature, h, r, step, block_hash, H160::random())
+	}
+
+	fn full_vote(collector: &VoteCollector, signature: H520, h: Height, r: Round, step: Step, block_hash: Option<BlockHash>, address: Address) -> Option<H160> {
+		collector.vote(ConsensusMessage { signature: signature, height: h, round: r, step: step, block_hash: block_hash }, address)
+	}
+
+	#[test]
+	fn seal_retrieval() {
+		let collector = VoteCollector::new();	
+		let bh = Some("1".sha3());
+		let h = 1;
+		let r = 2;
+		let mut signatures = Vec::new();
+		for _ in 0..5 {
+			signatures.push(H520::random());
+		}
+		// Wrong height proposal.
+		random_vote(&collector, signatures[4].clone(), h - 1, r, Step::Propose, bh.clone());
+		// Good proposal
+		random_vote(&collector, signatures[0].clone(), h, r, Step::Propose, bh.clone());
+		// Wrong block proposal.
+		random_vote(&collector, signatures[0].clone(), h, r, Step::Propose, Some("0".sha3()));
+		// Wrong block precommit.
+		random_vote(&collector, signatures[3].clone(), h, r, Step::Precommit, Some("0".sha3()));
+		// Wrong round proposal.
+		random_vote(&collector, signatures[0].clone(), h, r - 1, Step::Propose, bh.clone());
+		// Prevote.
+		random_vote(&collector, signatures[0].clone(), h, r, Step::Prevote, bh.clone());
+		// Relevant precommit.
+		random_vote(&collector, signatures[2].clone(), h, r, Step::Precommit, bh.clone());
+		// Replcated vote.
+		random_vote(&collector, signatures[2].clone(), h, r, Step::Precommit, bh.clone());
+		// Wrong round precommit.
+		random_vote(&collector, signatures[4].clone(), h, r + 1, Step::Precommit, bh.clone());
+		// Wrong height precommit.
+		random_vote(&collector, signatures[3].clone(), h + 1, r, Step::Precommit, bh.clone());
+		// Relevant precommit.
+		random_vote(&collector, signatures[1].clone(), h, r, Step::Precommit, bh.clone());
+		// Wrong round precommit, same signature.
+		random_vote(&collector, signatures[1].clone(), h, r + 1, Step::Precommit, bh.clone());
+		// Wrong round precommit.
+		random_vote(&collector, signatures[4].clone(), h, r - 1, Step::Precommit, bh.clone());
+		let seal = SealSignatures {
+			proposal: signatures[0],
+			votes: signatures[1..3].to_vec()
+		};
+		assert_eq!(seal, collector.seal_signatures(h, r, bh.unwrap()).unwrap());
+	}
+
+	#[test]
+	fn count_votes() {
+		let collector = VoteCollector::new();	
+		// good prevote
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 3, 1, Step::Prevote, Some("0".sha3()));
+		// good precommit
+		random_vote(&collector, H520::random(), 3, 2, Step::Precommit, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 3, 3, Step::Precommit, Some("0".sha3()));
+		// good prevote
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("1".sha3()));
+		// good prevote
+		let same_sig = H520::random();
+		random_vote(&collector, same_sig.clone(), 3, 2, Step::Prevote, Some("1".sha3()));
+		random_vote(&collector, same_sig, 3, 2, Step::Prevote, Some("1".sha3()));
+		// good precommit
+		random_vote(&collector, H520::random(), 3, 2, Step::Precommit, Some("1".sha3()));
+		// good prevote
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 2, 2, Step::Precommit, Some("2".sha3()));
+
+		assert_eq!(collector.count_step_votes(3, 2, Step::Prevote), 4);
+		assert_eq!(collector.count_step_votes(3, 2, Step::Precommit), 2);
+
+		let message = ConsensusMessage {
+			signature: H520::default(),
+			height: 3,
+			round: 2,
+			step: Step::Prevote,
+			block_hash: Some("1".sha3())
+		};
+		assert_eq!(collector.count_aligned_votes(&message), 2);
+	}
+
+	#[test]
+	fn remove_old() {
+		let collector = VoteCollector::new();	
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 3, 1, Step::Prevote, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 3, 3, Step::Precommit, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("1".sha3()));
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("1".sha3()));
+		random_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("0".sha3()));
+		random_vote(&collector, H520::random(), 2, 2, Step::Precommit, Some("2".sha3()));
+
+		let message = ConsensusMessage {
+			signature: H520::default(),
+			height: 3,
+			round: 2,
+			step: Step::Precommit,
+			block_hash: Some("1".sha3())
+		};
+		collector.throw_out_old(&message);
+		assert_eq!(collector.votes.read().len(), 1);
+	}
+
+	#[test]
+	fn malicious_authority() {
+		let collector = VoteCollector::new();	
+		full_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("0".sha3()), Address::default());
+		full_vote(&collector, H520::random(), 3, 2, Step::Prevote, Some("1".sha3()), Address::default());
+		assert_eq!(collector.count_step_votes(3, 2, Step::Prevote), 1);
+	}
+}

ethcore/src/error.rs

@@ -24,6 +24,7 @@ use client::Error as ClientError;
 use ipc::binary::{BinaryConvertError, BinaryConvertable};
 use types::block_import_error::BlockImportError;
 use snapshot::Error as SnapshotError;
+use engines::EngineError;
 use ethkey::Error as EthkeyError;
 
 pub use types::executed::{ExecutionError, CallError};
@@ -167,8 +168,6 @@ pub enum BlockError {
 	UnknownParent(H256),
 	/// Uncle parent given is unknown.
 	UnknownUncleParent(H256),
-	/// The same author issued different votes at the same step.
-	DoubleVote(H160),
 }
 
 impl fmt::Display for BlockError {
@@ -202,7 +201,6 @@ impl fmt::Display for BlockError {
 			RidiculousNumber(ref oob) => format!("Implausible block number. {}", oob),
 			UnknownParent(ref hash) => format!("Unknown parent: {}", hash),
 			UnknownUncleParent(ref hash) => format!("Unknown uncle parent: {}", hash),
-			DoubleVote(ref address) => format!("Author {} issued too many blocks.", address),
 		};
 
 		f.write_fmt(format_args!("Block error ({})", msg))
@@ -263,6 +261,8 @@ pub enum Error {
 	Snappy(::util::snappy::InvalidInput),
 	/// Snapshot error.
 	Snapshot(SnapshotError),
+	/// Consensus vote error.
+	Engine(EngineError),
 	/// Ethkey error.
 	Ethkey(EthkeyError),
 }
@@ -285,6 +285,7 @@ impl fmt::Display for Error {
 			Error::StdIo(ref err) => err.fmt(f),
 			Error::Snappy(ref err) => err.fmt(f),
 			Error::Snapshot(ref err) => err.fmt(f),
+			Error::Engine(ref err) => err.fmt(f),
 			Error::Ethkey(ref err) => err.fmt(f),
 		}
 	}
@@ -383,6 +384,12 @@ impl From<SnapshotError> for Error {
 	}
 }
 
+impl From<EngineError> for Error {
+	fn from(err: EngineError) -> Error {
+		Error::Engine(err)
+	}
+}
+
 impl From<EthkeyError> for Error {
 	fn from(err: EthkeyError) -> Error {
 		Error::Ethkey(err)

ethcore/src/miner/miner.rs

@@ -26,12 +26,12 @@ use state::{State, CleanupMode};
 use client::{MiningBlockChainClient, Executive, Executed, EnvInfo, TransactOptions, BlockId, CallAnalytics, TransactionId};
 use client::TransactionImportResult;
 use executive::contract_address;
-use block::{ClosedBlock, SealedBlock, IsBlock, Block};
+use block::{ClosedBlock, IsBlock, Block};
 use error::*;
 use transaction::{Action, SignedTransaction};
 use receipt::{Receipt, RichReceipt};
 use spec::Spec;
-use engines::Engine;
+use engines::{Engine, Seal};
 use miner::{MinerService, MinerStatus, TransactionQueue, PrioritizationStrategy, AccountDetails, TransactionOrigin};
 use miner::banning_queue::{BanningTransactionQueue, Threshold};
 use miner::work_notify::WorkPoster;
@@ -466,34 +466,43 @@ impl Miner {
 		}
 	}
 
-	/// Attempts to perform internal sealing (one that does not require work) to return Ok(sealed),
+	/// Attempts to perform internal sealing (one that does not require work) and handles the result depending on the type of Seal.
-	/// Err(Some(block)) returns for unsuccesful sealing while Err(None) indicates misspecified engine.
-	fn seal_block_internally(&self, block: ClosedBlock) -> Result<SealedBlock, Option<ClosedBlock>> {
-		trace!(target: "miner", "seal_block_internally: attempting internal seal.");
-		let s = self.engine.generate_seal(block.block());
-		if let Some(seal) = s {
-			trace!(target: "miner", "seal_block_internally: managed internal seal. importing...");
-			block.lock().try_seal(&*self.engine, seal).or_else(|(e, _)| {
-				warn!("prepare_sealing: ERROR: try_seal failed when given internally generated seal: {}", e);
-				Err(None)
-			})
-		} else {
-			trace!(target: "miner", "seal_block_internally: unable to generate seal internally");
-			Err(Some(block))
-		}
-	}
-
-	/// Uses Engine to seal the block internally and then imports it to chain.
 	fn seal_and_import_block_internally(&self, chain: &MiningBlockChainClient, block: ClosedBlock) -> bool {
 		if !block.transactions().is_empty() || self.forced_sealing() {
-			if let Ok(sealed) = self.seal_block_internally(block) {
+			trace!(target: "miner", "seal_block_internally: attempting internal seal.");
-				if chain.import_sealed_block(sealed).is_ok() {
+			match self.engine.generate_seal(block.block()) {
-					trace!(target: "miner", "import_block_internally: imported internally sealed block");
+				// Save proposal for later seal submission and broadcast it.
-					return true
+				Seal::Proposal(seal) => {
-				}
+					trace!(target: "miner", "Received a Proposal seal.");
+					{
+						let mut sealing_work = self.sealing_work.lock();
+						sealing_work.queue.push(block.clone());
+						sealing_work.queue.use_last_ref();
+					}
+					block
+						.lock()
+						.seal(&*self.engine, seal)
+						.map(|sealed| { chain.broadcast_proposal_block(sealed); true })
+						.unwrap_or_else(|e| {
+							warn!("ERROR: seal failed when given internally generated seal: {}", e);
+							false
+						})
+				},
+				// Directly import a regular sealed block.
+				Seal::Regular(seal) =>
+					block
+						.lock()
+						.seal(&*self.engine, seal)
+						.map(|sealed| chain.import_sealed_block(sealed).is_ok())
+						.unwrap_or_else(|e| {
+							warn!("ERROR: seal failed when given internally generated seal: {}", e);
+							false
+						}),
+				Seal::None => false,
 			}
+		} else {
+			false
 		}
-		false
 	}
 
 	/// Prepares work which has to be done to seal.
@@ -1024,7 +1033,6 @@ impl MinerService for Miner {
 		self.transaction_queue.lock().last_nonce(address)
 	}
 
-
 	/// Update sealing if required.
 	/// Prepare the block and work if the Engine does not seal internally.
 	fn update_sealing(&self, chain: &MiningBlockChainClient) {
@@ -1039,7 +1047,9 @@ impl MinerService for Miner {
 			let (block, original_work_hash) = self.prepare_block(chain);
 			if self.seals_internally {
 				trace!(target: "miner", "update_sealing: engine indicates internal sealing");
-				self.seal_and_import_block_internally(chain, block);
+				if self.seal_and_import_block_internally(chain, block) {
+					trace!(target: "miner", "update_sealing: imported internally sealed block");
+				}
 			} else {
 				trace!(target: "miner", "update_sealing: engine does not seal internally, preparing work");
 				self.prepare_work(block, original_work_hash);

ethcore/src/service.rs

@@ -20,7 +20,7 @@ use util::*;
 use io::*;
 use spec::Spec;
 use error::*;
-use client::{Client, ClientConfig, ChainNotify};
+use client::{Client, BlockChainClient, MiningBlockChainClient, ClientConfig, ChainNotify};
 use miner::Miner;
 use snapshot::ManifestData;
 use snapshot::service::{Service as SnapshotService, ServiceParams as SnapServiceParams};
@@ -28,11 +28,9 @@ use std::sync::atomic::AtomicBool;
 
 #[cfg(feature="ipc")]
 use nanoipc;
-#[cfg(feature="ipc")]
-use client::BlockChainClient;
 
 /// Message type for external and internal events
-#[derive(Clone)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum ClientIoMessage {
 	/// Best Block Hash in chain has been changed
 	NewChainHead,
@@ -50,6 +48,12 @@ pub enum ClientIoMessage {
 	TakeSnapshot(u64),
 	/// Trigger sealing update (useful for internal sealing).
 	UpdateSealing,
+	/// Submit seal (useful for internal sealing).
+	SubmitSeal(H256, Vec<Bytes>),
+	/// Broadcast a message to the network.
+	BroadcastMessage(Bytes),
+	/// New consensus message received.
+	NewMessage(Bytes)
 }
 
 /// Client service setup. Creates and registers client and network services with the IO subsystem.
@@ -77,9 +81,6 @@ impl ClientService {
 		panic_handler.forward_from(&io_service);
 
 		info!("Configured for {} using {} engine", Colour::White.bold().paint(spec.name.clone()), Colour::Yellow.bold().paint(spec.engine.name()));
-		if spec.fork_name.is_some() {
-			warn!("Your chain is an alternative fork. {}", Colour::Red.bold().paint("TRANSACTIONS MAY BE REPLAYED ON THE MAINNET!"));
-		}
 
 		let mut db_config = DatabaseConfig::with_columns(::db::NUM_COLUMNS);
 
@@ -220,9 +221,11 @@ impl IoHandler<ClientIoMessage> for ClientIoHandler {
 					debug!(target: "snapshot", "Failed to initialize periodic snapshot thread: {:?}", e);
 				}
 			},
-			ClientIoMessage::UpdateSealing => {
+			ClientIoMessage::UpdateSealing => self.client.update_sealing(),
-				trace!(target: "authorityround", "message: UpdateSealing");
+			ClientIoMessage::SubmitSeal(ref hash, ref seal) => self.client.submit_seal(*hash, seal.clone()),
-				self.client.update_sealing()
+			ClientIoMessage::BroadcastMessage(ref message) => self.client.broadcast_consensus_message(message.clone()),
+			ClientIoMessage::NewMessage(ref message) => if let Err(e) = self.client.engine().handle_message(message) {
+				trace!(target: "poa", "Invalid message received: {}", e);
 			},
 			_ => {} // ignore other messages
 		}

ethcore/src/snapshot/watcher.rs

@@ -23,7 +23,7 @@ use service::ClientIoMessage;
 use views::HeaderView;
 
 use io::IoChannel;
-use util::hash::H256;
+use util::{H256, Bytes};
 
 use std::sync::Arc;
 
@@ -107,6 +107,7 @@ impl ChainNotify for Watcher {
 		_: Vec<H256>,
 		_: Vec<H256>,
 		_: Vec<H256>,
+		_: Vec<Bytes>,
 		_duration: u64)
 	{
 		if self.oracle.is_major_importing() { return }
@@ -174,6 +175,7 @@ mod tests {
 			vec![],
 			vec![],
 			vec![],
+			vec![],
 			0,
 		);
 	}

ethcore/src/spec/seal.rs

@@ -17,7 +17,7 @@
 //! Spec seal.
 
 use rlp::*;
-use util::hash::{H64, H256};
+use util::hash::{H64, H256, H520};
 use ethjson;
 
 /// Classic ethereum seal.
@@ -32,23 +32,55 @@ impl Into<Generic> for Ethereum {
 	fn into(self) -> Generic {
 		let mut s = RlpStream::new_list(2);
 		s.append(&self.mix_hash).append(&self.nonce);
-		Generic {
+		Generic(s.out())
-			rlp: s.out()
-		}
 	}
 }
 
-/// Generic seal.
+/// AuthorityRound seal.
-pub struct Generic {
+pub struct AuthorityRound {
-	/// Seal rlp.
+	/// Seal step.
-	pub rlp: Vec<u8>,
+	pub step: usize,
+	/// Seal signature.
+	pub signature: H520,
 }
 
+/// Tendermint seal.
+pub struct Tendermint {
+	/// Seal round.
+	pub round: usize,
+	/// Proposal seal signature.
+	pub proposal: H520,
+	/// Precommit seal signatures.
+	pub precommits: Vec<H520>,
+}
+
+impl Into<Generic> for AuthorityRound {
+	fn into(self) -> Generic {
+		let mut s = RlpStream::new_list(2);
+		s.append(&self.step).append(&self.signature);
+		Generic(s.out())
+	}
+}
+
+impl Into<Generic> for Tendermint {
+	fn into(self) -> Generic {
+		let mut s = RlpStream::new_list(3);
+		s.append(&self.round).append(&self.proposal).append(&self.precommits);
+		Generic(s.out())
+	}
+}
+
+pub struct Generic(pub Vec<u8>);
+
 /// Genesis seal type.
 pub enum Seal {
 	/// Classic ethereum seal.
 	Ethereum(Ethereum),
-	/// Generic seal.
+	/// AuthorityRound seal.
+	AuthorityRound(AuthorityRound),
+	/// Tendermint seal.
+	Tendermint(Tendermint),
+	/// Generic RLP seal.
 	Generic(Generic),
 }
 
@@ -59,9 +91,16 @@ impl From<ethjson::spec::Seal> for Seal {
 				nonce: eth.nonce.into(),
 				mix_hash: eth.mix_hash.into()
 			}),
-			ethjson::spec::Seal::Generic(g) => Seal::Generic(Generic {
+			ethjson::spec::Seal::AuthorityRound(ar) => Seal::AuthorityRound(AuthorityRound {
-				rlp: g.rlp.into()
+				step: ar.step.into(),
-			})
+				signature: ar.signature.into()
+			}),
+			ethjson::spec::Seal::Tendermint(tender) => Seal::Tendermint(Tendermint {
+				round: tender.round.into(),
+				proposal: tender.proposal.into(),
+				precommits: tender.precommits.into_iter().map(Into::into).collect()
+			}),
+			ethjson::spec::Seal::Generic(g) => Seal::Generic(Generic(g.into())),
 		}
 	}
 }
@@ -70,7 +109,9 @@ impl Into<Generic> for Seal {
 	fn into(self) -> Generic {
 		match self {
 			Seal::Generic(generic) => generic,
-			Seal::Ethereum(eth) => eth.into()
+			Seal::Ethereum(eth) => eth.into(),
+			Seal::AuthorityRound(ar) => ar.into(),
+			Seal::Tendermint(tender) => tender.into(),
 		}
 	}
 }

ethcore/src/spec/spec.rs

@@ -18,7 +18,7 @@
 
 use util::*;
 use builtin::Builtin;
-use engines::{Engine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound};
+use engines::{Engine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound, Tendermint};
 use pod_state::*;
 use account_db::*;
 use header::{BlockNumber, Header};
@@ -66,8 +66,8 @@ pub struct Spec {
 	pub name: String,
 	/// What engine are we using for this?
 	pub engine: Arc<Engine>,
-	/// The fork identifier for this chain. Only needed to distinguish two chains sharing the same genesis.
+	/// Name of the subdir inside the main data dir to use for chain data and settings.
-	pub fork_name: Option<String>,
+	pub data_dir: String,
 
 	/// Known nodes on the network in enode format.
 	pub nodes: Vec<String>,
@@ -107,13 +107,13 @@ impl From<ethjson::spec::Spec> for Spec {
 	fn from(s: ethjson::spec::Spec) -> Self {
 		let builtins = s.accounts.builtins().into_iter().map(|p| (p.0.into(), From::from(p.1))).collect();
 		let g = Genesis::from(s.genesis);
-		let seal: GenericSeal = g.seal.into();
+		let GenericSeal(seal_rlp) = g.seal.into();
 		let params = CommonParams::from(s.params);
 		Spec {
-			name: s.name.into(),
+			name: s.name.clone().into(),
 			params: params.clone(),
 			engine: Spec::engine(s.engine, params, builtins),
-			fork_name: s.fork_name.map(Into::into),
+			data_dir: s.data_dir.unwrap_or(s.name).into(),
 			nodes: s.nodes.unwrap_or_else(Vec::new),
 			parent_hash: g.parent_hash,
 			transactions_root: g.transactions_root,
@@ -124,7 +124,7 @@ impl From<ethjson::spec::Spec> for Spec {
 			gas_used: g.gas_used,
 			timestamp: g.timestamp,
 			extra_data: g.extra_data,
-			seal_rlp: seal.rlp,
+			seal_rlp: seal_rlp,
 			state_root_memo: RwLock::new(g.state_root),
 			genesis_state: From::from(s.accounts),
 		}
@@ -146,7 +146,8 @@ impl Spec {
 			ethjson::spec::Engine::InstantSeal => Arc::new(InstantSeal::new(params, builtins)),
 			ethjson::spec::Engine::Ethash(ethash) => Arc::new(ethereum::Ethash::new(params, From::from(ethash.params), builtins)),
 			ethjson::spec::Engine::BasicAuthority(basic_authority) => Arc::new(BasicAuthority::new(params, From::from(basic_authority.params), builtins)),
-			ethjson::spec::Engine::AuthorityRound(authority_round) => AuthorityRound::new(params, From::from(authority_round.params), builtins).expect("Consensus engine could not be started."),
+			ethjson::spec::Engine::AuthorityRound(authority_round) => AuthorityRound::new(params, From::from(authority_round.params), builtins).expect("Failed to start AuthorityRound consensus engine."),
+			ethjson::spec::Engine::Tendermint(tendermint) => Tendermint::new(params, From::from(tendermint.params), builtins).expect("Failed to start the Tendermint consensus engine."),
 		}
 	}
 
@@ -208,7 +209,7 @@ impl Spec {
 
 	/// Overwrite the genesis components.
 	pub fn overwrite_genesis_params(&mut self, g: Genesis) {
-		let seal: GenericSeal = g.seal.into();
+		let GenericSeal(seal_rlp) = g.seal.into();
 		self.parent_hash = g.parent_hash;
 		self.transactions_root = g.transactions_root;
 		self.receipts_root = g.receipts_root;
@@ -218,7 +219,7 @@ impl Spec {
 		self.gas_used = g.gas_used;
 		self.timestamp = g.timestamp;
 		self.extra_data = g.extra_data;
-		self.seal_rlp = seal.rlp;
+		self.seal_rlp = seal_rlp;
 		self.state_root_memo = RwLock::new(g.state_root);
 	}
 
@@ -275,6 +276,10 @@ impl Spec {
 	/// Create a new Spec with AuthorityRound consensus which does internal sealing (not requiring work).
 	/// Accounts with secrets "0".sha3() and "1".sha3() are the authorities.
 	pub fn new_test_round() -> Self { load_bundled!("authority_round") }
+
+	/// Create a new Spec with Tendermint consensus which does internal sealing (not requiring work).
+	/// Account "0".sha3() and "1".sha3() are a authorities.
+	pub fn new_test_tendermint() -> Self { load_bundled!("tendermint") }
 }
 
 #[cfg(test)]

ethcore/src/state_db.rs

@@ -457,7 +457,6 @@ impl StateDB {
 
 #[cfg(test)]
 mod tests {
-
 	use util::{U256, H256, FixedHash, Address, DBTransaction};
 	use tests::helpers::*;
 	use state::Account;
@@ -531,4 +530,3 @@ mod tests {
 		assert!(s.get_cached_account(&address).is_none());
 	}
 }
-

ethkey/src/signature.rs

@@ -18,6 +18,7 @@ use std::ops::{Deref, DerefMut};
 use std::cmp::PartialEq;
 use std::{mem, fmt};
 use std::str::FromStr;
+use std::hash::{Hash, Hasher};
 use secp256k1::{Message as SecpMessage, RecoverableSignature, RecoveryId, Error as SecpError};
 use secp256k1::key::{SecretKey, PublicKey};
 use rustc_serialize::hex::{ToHex, FromHex};
@@ -116,6 +117,18 @@ impl Default for Signature {
 	}
 }
 
+impl Hash for Signature {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+    	H520::from(self.0).hash(state);
+    }
+}
+
+impl Clone for Signature {
+    fn clone(&self) -> Self {
+		Signature(self.0)
+    }
+}
+
 impl From<[u8; 65]> for Signature {
 	fn from(s: [u8; 65]) -> Self {
 		Signature(s)

ethstore/src/dir/disk.rs

@@ -18,7 +18,6 @@ use std::{fs, io};
 use std::path::{PathBuf, Path};
 use std::collections::HashMap;
 use time;
-use ethkey::Address;
 use {json, SafeAccount, Error};
 use json::Uuid;
 use super::KeyDirectory;
@@ -106,6 +105,11 @@ impl KeyDirectory for DiskDirectory {
 		Ok(accounts)
 	}
 
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
+		// Disk store handles updates correctly iff filename is the same
+		self.insert(account)
+	}
+
 	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
 		// transform account into key file
 		let keyfile: json::KeyFile = account.clone().into();
@@ -138,12 +142,12 @@ impl KeyDirectory for DiskDirectory {
 		Ok(account)
 	}
 
-	fn remove(&self, address: &Address) -> Result<(), Error> {
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
 		// enumerate all entries in keystore
 		// and find entry with given address
 		let to_remove = try!(self.files())
 			.into_iter()
-			.find(|&(_, ref account)| &account.address == address);
+			.find(|&(_, ref acc)| acc == account);
 
 		// remove it
 		match to_remove {

ethstore/src/dir/geth.rs

@@ -16,7 +16,6 @@
 
 use std::env;
 use std::path::PathBuf;
-use ethkey::Address;
 use {SafeAccount, Error};
 use super::{KeyDirectory, DiskDirectory, DirectoryType};
 
@@ -89,7 +88,11 @@ impl KeyDirectory for GethDirectory {
 		self.dir.insert(account)
 	}
 
-	fn remove(&self, address: &Address) -> Result<(), Error> {
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
-		self.dir.remove(address)
+		self.dir.update(account)
+	}
+
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
+		self.dir.remove(account)
 	}
 }

ethstore/src/dir/memory.rs

@@ -0,0 +1,67 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use std::collections::HashMap;
+use parking_lot::RwLock;
+use itertools::Itertools;
+use ethkey::Address;
+
+use {SafeAccount, Error};
+use super::KeyDirectory;
+
+#[derive(Default)]
+pub struct MemoryDirectory {
+	accounts: RwLock<HashMap<Address, Vec<SafeAccount>>>,
+}
+
+impl KeyDirectory for MemoryDirectory {
+	fn load(&self) -> Result<Vec<SafeAccount>, Error> {
+		Ok(self.accounts.read().values().cloned().flatten().collect())
+	}
+
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
+		let mut lock = self.accounts.write();
+		let mut accounts = lock.entry(account.address.clone()).or_insert_with(Vec::new);
+		// If the filename is the same we just need to replace the entry
+		accounts.retain(|acc| acc.filename != account.filename);
+		accounts.push(account.clone());
+		Ok(account)
+	}
+
+	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
+		let mut lock = self.accounts.write();
+		let mut accounts = lock.entry(account.address.clone()).or_insert_with(Vec::new);
+		accounts.push(account.clone());
+		Ok(account)
+	}
+
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
+		let mut accounts = self.accounts.write();
+		let is_empty = if let Some(mut accounts) = accounts.get_mut(&account.address) {
+			if let Some(position) = accounts.iter().position(|acc| acc == account) {
+				accounts.remove(position);
+			}
+			accounts.is_empty()
+		} else {
+			false
+		};
+		if is_empty {
+			accounts.remove(&account.address);
+		}
+		Ok(())
+	}
+}
+

ethstore/src/dir/mod.rs

@@ -14,12 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-use ethkey::Address;
 use std::path::{PathBuf};
 use {SafeAccount, Error};
 
 mod disk;
 mod geth;
+mod memory;
 mod parity;
 
 pub enum DirectoryType {
@@ -30,10 +30,12 @@ pub enum DirectoryType {
 pub trait KeyDirectory: Send + Sync {
 	fn load(&self) -> Result<Vec<SafeAccount>, Error>;
 	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, Error>;
-	fn remove(&self, address: &Address) -> Result<(), Error>;
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error>;
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error>;
 	fn path(&self) -> Option<&PathBuf> { None }
 }
 
 pub use self::disk::DiskDirectory;
 pub use self::geth::GethDirectory;
+pub use self::memory::MemoryDirectory;
 pub use self::parity::ParityDirectory;

ethstore/src/dir/parity.rs

@@ -16,7 +16,6 @@
 
 use std::env;
 use std::path::PathBuf;
-use ethkey::Address;
 use {SafeAccount, Error};
 use super::{KeyDirectory, DiskDirectory, DirectoryType};
 
@@ -68,7 +67,11 @@ impl KeyDirectory for ParityDirectory {
 		self.dir.insert(account)
 	}
 
-	fn remove(&self, address: &Address) -> Result<(), Error> {
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
-		self.dir.remove(address)
+		self.dir.update(account)
+	}
+
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
+		self.dir.remove(account)
 	}
 }

ethstore/src/ethstore.rs

@@ -16,23 +16,19 @@
 
 use std::collections::BTreeMap;
 use std::mem;
-use ethkey::KeyPair;
+use parking_lot::RwLock;
+
 use crypto::KEY_ITERATIONS;
 use random::Random;
-use ethkey::{Signature, Address, Message, Secret, Public};
+use ethkey::{Signature, Address, Message, Secret, Public, KeyPair};
 use dir::KeyDirectory;
 use account::SafeAccount;
-use {Error, SecretStore};
-use json;
-use json::Uuid;
-use parking_lot::RwLock;
 use presale::PresaleWallet;
-use import;
+use json::{self, Uuid};
+use {import, Error, SimpleSecretStore, SecretStore};
 
 pub struct EthStore {
-	dir: Box<KeyDirectory>,
+	store: EthMultiStore,
-	iterations: u32,
-	cache: RwLock<BTreeMap<Address, SafeAccount>>,
 }
 
 impl EthStore {
@@ -41,57 +37,46 @@ impl EthStore {
 	}
 
 	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: u32) -> Result<Self, Error> {
-		let accounts = try!(directory.load());
+		Ok(EthStore {
-		let cache = accounts.into_iter().map(|account| (account.address.clone(), account)).collect();
+			store: try!(EthMultiStore::open_with_iterations(directory, iterations)),
-		let store = EthStore {
+		})
-			dir: directory,
-			iterations: iterations,
-			cache: RwLock::new(cache),
-		};
-		Ok(store)
-	}
-
-	fn save(&self, account: SafeAccount) -> Result<(), Error> {
-		// save to file
-		let account = try!(self.dir.insert(account.clone()));
-
-		// update cache
-		let mut cache = self.cache.write();
-		cache.insert(account.address.clone(), account);
-		Ok(())
-	}
-
-	fn reload_accounts(&self) -> Result<(), Error> {
-		let mut cache = self.cache.write();
-		let accounts = try!(self.dir.load());
-		let new_accounts: BTreeMap<_, _> = accounts.into_iter().map(|account| (account.address.clone(), account)).collect();
-		mem::replace(&mut *cache, new_accounts);
-		Ok(())
 	}
 
 	fn get(&self, address: &Address) -> Result<SafeAccount, Error> {
-		{
+		let mut accounts = try!(self.store.get(address)).into_iter();
-			let cache = self.cache.read();
+		accounts.next().ok_or(Error::InvalidAccount)
-			if let Some(account) = cache.get(address) {
+	}
-				return Ok(account.clone())
+}
-			}
+
-		}
+impl SimpleSecretStore for EthStore {
-		try!(self.reload_accounts());
+	fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error> {
-		let cache = self.cache.read();
+		self.store.insert_account(secret, password)
-		cache.get(address).cloned().ok_or(Error::InvalidAccount)
+	}
+
+	fn accounts(&self) -> Result<Vec<Address>, Error> {
+		self.store.accounts()
+	}
+
+	fn change_password(&self, address: &Address, old_password: &str, new_password: &str) -> Result<(), Error> {
+		self.store.change_password(address, old_password, new_password)
+	}
+
+	fn remove_account(&self, address: &Address, password: &str) -> Result<(), Error> {
+		self.store.remove_account(address, password)
+	}
+
+	fn sign(&self, address: &Address, password: &str, message: &Message) -> Result<Signature, Error> {
+		let account = try!(self.get(address));
+		account.sign(password, message)
+	}
+
+	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
+		let account = try!(self.get(account));
+		account.decrypt(password, shared_mac, message)
 	}
 }
 
 impl SecretStore for EthStore {
-	fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error> {
-		let keypair = try!(KeyPair::from_secret(secret).map_err(|_| Error::CreationFailed));
-		let id: [u8; 16] = Random::random();
-		let account = SafeAccount::create(&keypair, id, password, self.iterations, "".to_owned(), "{}".to_owned());
-		let address = account.address.clone();
-		try!(self.save(account));
-		Ok(address)
-	}
-
 	fn import_presale(&self, json: &[u8], password: &str) -> Result<Address, Error> {
 		let json_wallet = try!(json::PresaleWallet::load(json).map_err(|_| Error::InvalidKeyFile("Invalid JSON format".to_owned())));
 		let wallet = PresaleWallet::from(json_wallet);
@@ -105,48 +90,20 @@ impl SecretStore for EthStore {
 		let secret = try!(safe_account.crypto.secret(password).map_err(|_| Error::InvalidPassword));
 		safe_account.address = try!(KeyPair::from_secret(secret)).address();
 		let address = safe_account.address.clone();
-		try!(self.save(safe_account));
+		try!(self.store.import(safe_account));
 		Ok(address)
 	}
 
-	fn accounts(&self) -> Result<Vec<Address>, Error> {
+	fn test_password(&self, address: &Address, password: &str) -> Result<bool, Error> {
-		try!(self.reload_accounts());
-		Ok(self.cache.read().keys().cloned().collect())
-	}
-
-	fn change_password(&self, address: &Address, old_password: &str, new_password: &str) -> Result<(), Error> {
-		// change password
 		let account = try!(self.get(address));
-		let account = try!(account.change_password(old_password, new_password, self.iterations));
+		Ok(account.check_password(password))
-
-		// save to file
-		self.save(account)
 	}
 
-	fn remove_account(&self, address: &Address, password: &str) -> Result<(), Error> {
+	fn copy_account(&self, new_store: &SimpleSecretStore, address: &Address, password: &str, new_password: &str) -> Result<(), Error> {
-		let can_remove = {
-			let account = try!(self.get(address));
-			account.check_password(password)
-		};
-
-		if can_remove {
-			try!(self.dir.remove(address));
-			let mut cache = self.cache.write();
-			cache.remove(address);
-			Ok(())
-		} else {
-			Err(Error::InvalidPassword)
-		}
-	}
-
-	fn sign(&self, address: &Address, password: &str, message: &Message) -> Result<Signature, Error> {
 		let account = try!(self.get(address));
-		account.sign(password, message)
+		let secret = try!(account.crypto.secret(password));
-	}
+		try!(new_store.insert_account(secret, new_password));
-
+		Ok(())
-	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
-		let account = try!(self.get(account));
-		account.decrypt(password, shared_mac, message)
 	}
 
 	fn public(&self, account: &Address, password: &str) -> Result<Public, Error> {
@@ -170,23 +127,25 @@ impl SecretStore for EthStore {
 	}
 
 	fn set_name(&self, address: &Address, name: String) -> Result<(), Error> {
-		let mut account = try!(self.get(address));
+		let old = try!(self.get(address));
+		let mut account = old.clone();
 		account.name = name;
 
 		// save to file
-		self.save(account)
+		self.store.update(old, account)
 	}
 
 	fn set_meta(&self, address: &Address, meta: String) -> Result<(), Error> {
-		let mut account = try!(self.get(address));
+		let old = try!(self.get(address));
+		let mut account = old.clone();
 		account.meta = meta;
 
 		// save to file
-		self.save(account)
+		self.store.update(old, account)
 	}
 
 	fn local_path(&self) -> String {
-		self.dir.path().map(|p| p.to_string_lossy().into_owned()).unwrap_or_else(|| String::new())
+		self.store.dir.path().map(|p| p.to_string_lossy().into_owned()).unwrap_or_else(|| String::new())
 	}
 
 	fn list_geth_accounts(&self, testnet: bool) -> Vec<Address> {
@@ -194,6 +153,288 @@ impl SecretStore for EthStore {
 	}
 
 	fn import_geth_accounts(&self, desired: Vec<Address>, testnet: bool) -> Result<Vec<Address>, Error> {
-		import::import_geth_accounts(&*self.dir, desired.into_iter().collect(), testnet)
+		import::import_geth_accounts(&*self.store.dir, desired.into_iter().collect(), testnet)
 	}
 }
+
+/// Similar to `EthStore` but may store many accounts (with different passwords) for the same `Address`
+pub struct EthMultiStore {
+	dir: Box<KeyDirectory>,
+	iterations: u32,
+	cache: RwLock<BTreeMap<Address, Vec<SafeAccount>>>,
+}
+
+impl EthMultiStore {
+
+	pub fn open(directory: Box<KeyDirectory>) -> Result<Self, Error> {
+		Self::open_with_iterations(directory, KEY_ITERATIONS as u32)
+	}
+
+	pub fn open_with_iterations(directory: Box<KeyDirectory>, iterations: u32) -> Result<Self, Error> {
+		let store = EthMultiStore {
+			dir: directory,
+			iterations: iterations,
+			cache: Default::default(),
+		};
+		try!(store.reload_accounts());
+		Ok(store)
+	}
+
+	fn reload_accounts(&self) -> Result<(), Error> {
+		let mut cache = self.cache.write();
+		let accounts = try!(self.dir.load());
+
+		let mut new_accounts = BTreeMap::new();
+		for account in accounts {
+			let mut entry = new_accounts.entry(account.address.clone()).or_insert_with(Vec::new);
+			entry.push(account);
+		}
+		mem::replace(&mut *cache, new_accounts);
+		Ok(())
+	}
+
+	fn get(&self, address: &Address) -> Result<Vec<SafeAccount>, Error> {
+		{
+			let cache = self.cache.read();
+			if let Some(accounts) = cache.get(address) {
+				if !accounts.is_empty() {
+					return Ok(accounts.clone())
+				}
+			}
+		}
+
+		try!(self.reload_accounts());
+		let cache = self.cache.read();
+		let accounts = try!(cache.get(address).cloned().ok_or(Error::InvalidAccount));
+		if accounts.is_empty() {
+			Err(Error::InvalidAccount)
+		} else {
+			Ok(accounts)
+		}
+	}
+
+	fn import(&self, account: SafeAccount) -> Result<(), Error> {
+		// save to file
+		let account = try!(self.dir.insert(account));
+
+		// update cache
+		let mut cache = self.cache.write();
+		let mut accounts = cache.entry(account.address.clone()).or_insert_with(Vec::new);
+		accounts.push(account);
+		Ok(())
+	}
+
+	fn update(&self, old: SafeAccount, new: SafeAccount) -> Result<(), Error> {
+		// save to file
+		let account = try!(self.dir.update(new));
+
+		// update cache
+		let mut cache = self.cache.write();
+		let mut accounts = cache.entry(account.address.clone()).or_insert_with(Vec::new);
+		// Remove old account
+		accounts.retain(|acc| acc != &old);
+		// And push updated to the end
+		accounts.push(account);
+		Ok(())
+
+	}
+
+}
+
+impl SimpleSecretStore for EthMultiStore {
+	fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error> {
+		let keypair = try!(KeyPair::from_secret(secret).map_err(|_| Error::CreationFailed));
+		let id: [u8; 16] = Random::random();
+		let account = SafeAccount::create(&keypair, id, password, self.iterations, "".to_owned(), "{}".to_owned());
+		let address = account.address.clone();
+		try!(self.import(account));
+		Ok(address)
+	}
+
+	fn accounts(&self) -> Result<Vec<Address>, Error> {
+		try!(self.reload_accounts());
+		Ok(self.cache.read().keys().cloned().collect())
+	}
+
+	fn remove_account(&self, address: &Address, password: &str) -> Result<(), Error> {
+		let accounts = try!(self.get(address));
+
+		for account in accounts {
+			// Skip if password is invalid
+			if !account.check_password(password) {
+				continue;
+			}
+
+			// Remove from dir
+			try!(self.dir.remove(&account));
+
+			// Remove from cache
+			let mut cache = self.cache.write();
+			let is_empty = {
+				let mut accounts = cache.get_mut(address).expect("Entry exists, because it was returned by `get`; qed");
+				if let Some(position) = accounts.iter().position(|acc| acc == &account) {
+					accounts.remove(position);
+				}
+				accounts.is_empty()
+			};
+
+			if is_empty {
+				cache.remove(address);
+			}
+
+			return Ok(());
+		}
+		Err(Error::InvalidPassword)
+	}
+
+	fn change_password(&self, address: &Address, old_password: &str, new_password: &str) -> Result<(), Error> {
+		let accounts = try!(self.get(address));
+		for account in accounts {
+			// Change password
+			let new_account = try!(account.change_password(old_password, new_password, self.iterations));
+			try!(self.update(account, new_account));
+		}
+		Ok(())
+	}
+
+	fn sign(&self, address: &Address, password: &str, message: &Message) -> Result<Signature, Error> {
+		let accounts = try!(self.get(address));
+		for account in accounts {
+			if account.check_password(password) {
+				return account.sign(password, message);
+			}
+		}
+
+		Err(Error::InvalidPassword)
+	}
+
+	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
+		let accounts = try!(self.get(account));
+		for account in accounts {
+			if account.check_password(password) {
+				return account.decrypt(password, shared_mac, message);
+			}
+		}
+		Err(Error::InvalidPassword)
+	}
+}
+
+#[cfg(test)]
+mod tests {
+
+	use dir::MemoryDirectory;
+	use ethkey::{Random, Generator, KeyPair};
+	use secret_store::{SimpleSecretStore, SecretStore};
+	use super::{EthStore, EthMultiStore};
+
+	fn keypair() -> KeyPair {
+		Random.generate().unwrap()
+	}
+
+	fn store() -> EthStore {
+		EthStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory always load successfuly; qed")
+	}
+
+	fn multi_store() -> EthMultiStore {
+		EthMultiStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory always load successfuly; qed")
+	}
+
+	#[test]
+	fn should_insert_account_successfully() {
+		// given
+		let store = store();
+		let keypair = keypair();
+
+		// when
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+
+		// then
+		assert_eq!(address, keypair.address());
+		assert!(store.get(&address).is_ok(), "Should contain account.");
+		assert_eq!(store.accounts().unwrap().len(), 1, "Should have one account.");
+	}
+
+	#[test]
+	fn should_update_meta_and_name() {
+		// given
+		let store = store();
+		let keypair = keypair();
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+		assert_eq!(&store.meta(&address).unwrap(), "{}");
+		assert_eq!(&store.name(&address).unwrap(), "");
+
+		// when
+		store.set_meta(&address, "meta".into()).unwrap();
+		store.set_name(&address, "name".into()).unwrap();
+
+		// then
+		assert_eq!(&store.meta(&address).unwrap(), "meta");
+		assert_eq!(&store.name(&address).unwrap(), "name");
+		assert_eq!(store.accounts().unwrap().len(), 1);
+	}
+
+	#[test]
+	fn should_remove_account() {
+		// given
+		let store = store();
+		let keypair = keypair();
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+
+		// when
+		store.remove_account(&address, "test").unwrap();
+
+		// then
+		assert_eq!(store.accounts().unwrap().len(), 0, "Should remove account.");
+	}
+
+	#[test]
+	fn should_return_true_if_password_is_correct() {
+		// given
+		let store = store();
+		let keypair = keypair();
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+
+		// when
+		let res1 = store.test_password(&address, "x").unwrap();
+		let res2 = store.test_password(&address, "test").unwrap();
+
+		assert!(!res1, "First password should be invalid.");
+		assert!(res2, "Second password should be correct.");
+	}
+
+	#[test]
+	fn multistore_should_be_able_to_have_the_same_account_twice() {
+		// given
+		let store = multi_store();
+		let keypair = keypair();
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+		let address2 = store.insert_account(keypair.secret().clone(), "xyz").unwrap();
+		assert_eq!(address, address2);
+
+		// when
+		assert!(store.remove_account(&address, "test").is_ok(), "First password should work.");
+		assert_eq!(store.accounts().unwrap().len(), 1);
+
+		assert!(store.remove_account(&address, "xyz").is_ok(), "Second password should work too.");
+		assert_eq!(store.accounts().unwrap().len(), 0);
+	}
+
+	#[test]
+	fn should_copy_account() {
+		// given
+		let store = store();
+		let multi_store = multi_store();
+		let keypair = keypair();
+		let address = store.insert_account(keypair.secret().clone(), "test").unwrap();
+		assert_eq!(multi_store.accounts().unwrap().len(), 0);
+
+		// when
+		store.copy_account(&multi_store, &address, "test", "xyz").unwrap();
+
+		// then
+		assert!(store.test_password(&address, "test").unwrap(), "First password should work for store.");
+		assert!(multi_store.sign(&address, "xyz", &Default::default()).is_ok(), "Second password should work for second store.");
+		assert_eq!(multi_store.accounts().unwrap().len(), 1);
+	}
+
+}

ethstore/src/lib.rs

@@ -50,8 +50,8 @@ mod secret_store;
 
 pub use self::account::SafeAccount;
 pub use self::error::Error;
-pub use self::ethstore::EthStore;
+pub use self::ethstore::{EthStore, EthMultiStore};
 pub use self::import::{import_accounts, read_geth_accounts};
 pub use self::presale::PresaleWallet;
-pub use self::secret_store::SecretStore;
+pub use self::secret_store::{SimpleSecretStore, SecretStore};
-pub use self::random::random_phrase;
+pub use self::random::{random_phrase, random_string};

ethstore/src/random.rs

@@ -51,10 +51,16 @@ pub fn random_phrase(words: usize) -> String {
 			.map(|s| s.to_owned())
 			.collect();
 	}
-	let mut rng = OsRng::new().unwrap();
+	let mut rng = OsRng::new().expect("Not able to operate without random source.");
 	(0..words).map(|_| rng.choose(&WORDS).unwrap()).join(" ")
 }
 
+/// Generate a random string of given length.
+pub fn random_string(length: usize) -> String {
+	let mut rng = OsRng::new().expect("Not able to operate without random source.");
+	rng.gen_ascii_chars().take(length).collect()
+}
+
 #[cfg(test)]
 mod tests {
 	use super::random_phrase;

ethstore/src/secret_store.rs

@@ -18,18 +18,25 @@ use ethkey::{Address, Message, Signature, Secret, Public};
 use Error;
 use json::Uuid;
 
-pub trait SecretStore: Send + Sync {
+pub trait SimpleSecretStore: Send + Sync {
 	fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error>;
-	fn import_presale(&self, json: &[u8], password: &str) -> Result<Address, Error>;
-	fn import_wallet(&self, json: &[u8], password: &str) -> Result<Address, Error>;
 	fn change_password(&self, account: &Address, old_password: &str, new_password: &str) -> Result<(), Error>;
 	fn remove_account(&self, account: &Address, password: &str) -> Result<(), Error>;
 
 	fn sign(&self, account: &Address, password: &str, message: &Message) -> Result<Signature, Error>;
 	fn decrypt(&self, account: &Address, password: &str, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, Error>;
-	fn public(&self, account: &Address, password: &str) -> Result<Public, Error>;
 
 	fn accounts(&self) -> Result<Vec<Address>, Error>;
+}
+
+pub trait SecretStore: SimpleSecretStore {
+	fn import_presale(&self, json: &[u8], password: &str) -> Result<Address, Error>;
+	fn import_wallet(&self, json: &[u8], password: &str) -> Result<Address, Error>;
+	fn copy_account(&self, new_store: &SimpleSecretStore, account: &Address, password: &str, new_password: &str) -> Result<(), Error>;
+	fn test_password(&self, account: &Address, password: &str) -> Result<bool, Error>;
+
+	fn public(&self, account: &Address, password: &str) -> Result<Public, Error>;
+
 	fn uuid(&self, account: &Address) -> Result<Uuid, Error>;
 	fn name(&self, account: &Address) -> Result<String, Error>;
 	fn meta(&self, account: &Address) -> Result<String, Error>;

ethstore/tests/api.rs

@@ -19,7 +19,7 @@ extern crate ethstore;
 
 mod util;
 
-use ethstore::{SecretStore, EthStore};
+use ethstore::{EthStore, SimpleSecretStore};
 use ethstore::ethkey::{Random, Generator, Secret, KeyPair, verify_address};
 use ethstore::dir::DiskDirectory;
 use util::TransientDir;

ethstore/tests/util/transient_dir.rs

@@ -18,7 +18,6 @@ use std::path::PathBuf;
 use std::{env, fs};
 use rand::{Rng, OsRng};
 use ethstore::dir::{KeyDirectory, DiskDirectory};
-use ethstore::ethkey::Address;
 use ethstore::{Error, SafeAccount};
 
 pub fn random_dir() -> PathBuf {
@@ -64,11 +63,15 @@ impl KeyDirectory for TransientDir {
 		self.dir.load()
 	}
 
+	fn update(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
+		self.dir.update(account)
+	}
+
 	fn insert(&self, account: SafeAccount) -> Result<SafeAccount, Error> {
 		self.dir.insert(account)
 	}
 
-	fn remove(&self, address: &Address) -> Result<(), Error> {
+	fn remove(&self, account: &SafeAccount) -> Result<(), Error> {
-		self.dir.remove(address)
+		self.dir.remove(account)
 	}
 }

js/.stylelintrc.json

@@ -0,0 +1,8 @@
+{
+  "extends": "stylelint-config-standard",
+  "rules": {
+    "selector-pseudo-class-no-unknown": [
+      true, { "ignorePseudoClasses": ["global"] }
+    ]
+  }
+}

js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "parity.js",
-  "version": "0.2.122",
+  "version": "0.2.123",
   "main": "release/index.js",
   "jsnext:main": "src/index.js",
   "author": "Parity Team <admin@parity.io>",
@@ -38,8 +38,11 @@
     "start:app": "node webpack/dev.server",
     "clean": "rm -rf ./build ./coverage",
     "coveralls": "npm run testCoverage && coveralls < coverage/lcov.info",
-    "lint": "eslint --ignore-path .gitignore ./src/",
+    "lint": "npm run lint:css && npm run lint:js",
-    "lint:cached": "eslint --cache --ignore-path .gitignore ./src/",
+    "lint:cached": "npm run lint:css && npm run lint:js:cached",
+    "lint:css": "stylelint ./src/**/*.css",
+    "lint:js": "eslint --ignore-path .gitignore ./src/",
+    "lint:js:cached": "eslint --cache --ignore-path .gitignore ./src/",
     "test": "NODE_ENV=test mocha 'src/**/*.spec.js'",
     "test:coverage": "NODE_ENV=test istanbul cover _mocha -- 'src/**/*.spec.js'",
     "test:e2e": "NODE_ENV=test mocha 'src/**/*.e2e.js'",
@@ -118,6 +121,8 @@
     "sinon-as-promised": "4.0.2",
     "sinon-chai": "2.8.0",
     "style-loader": "0.13.1",
+    "stylelint": "7.6.0",
+    "stylelint-config-standard": "15.0.0",
     "url-loader": "0.5.7",
     "webpack": "2.1.0-beta.27",
     "webpack-dev-middleware": "1.8.4",

js/src/contracts/badgereg.js

@@ -18,7 +18,8 @@ import { bytesToHex, hex2Ascii } from '~/api/util/format';
 
 import ABI from './abi/certifier.json';
 
-const ZERO = '0x0000000000000000000000000000000000000000000000000000000000000000';
+const ZERO20 = '0x0000000000000000000000000000000000000000';
+const ZERO32 = '0x0000000000000000000000000000000000000000000000000000000000000000';
 
 export default class BadgeReg {
   constructor (api, registry) {
@@ -26,32 +27,57 @@ export default class BadgeReg {
     this._registry = registry;
 
     registry.getContract('badgereg');
-    this.certifiers = {}; // by name
+    this.certifiers = []; // by id
     this.contracts = {}; // by name
   }
 
-  fetchCertifier (name) {
+  certifierCount () {
-    if (this.certifiers[name]) {
+    return this._registry.getContract('badgereg')
-      return Promise.resolve(this.certifiers[name]);
+      .then((badgeReg) => {
+        return badgeReg.instance.badgeCount.call({}, [])
+          .then((count) => count.valueOf());
+      });
+  }
+
+  fetchCertifier (id) {
+    if (this.certifiers[id]) {
+      return Promise.resolve(this.certifiers[id]);
     }
     return this._registry.getContract('badgereg')
       .then((badgeReg) => {
-        return badgeReg.instance.fromName.call({}, [name])
+        return badgeReg.instance.badge.call({}, [ id ]);
-        .then(([ id, address ]) => {
+      })
-          return Promise.all([
+      .then(([ address, name ]) => {
-            badgeReg.instance.meta.call({}, [id, 'TITLE']),
+        if (address === ZERO20) {
-            badgeReg.instance.meta.call({}, [id, 'IMG'])
+          throw new Error(`Certifier ${id} does not exist.`);
-          ])
+        }
-            .then(([ title, img ]) => {
-              title = bytesToHex(title);
-              title = title === ZERO ? null : hex2Ascii(title);
-              if (bytesToHex(img) === ZERO) img = null;
 
-              const data = { address, name, title, icon: img };
+        name = bytesToHex(name);
-              this.certifiers[name] = data;
+        name = name === ZERO32
-              return data;
+          ? null
-            });
+          : hex2Ascii(name);
-        });
+        return this.fetchMeta(id)
+          .then(({ title, icon }) => {
+            const data = { address, id, name, title, icon };
+            this.certifiers[id] = data;
+            return data;
+          });
+      });
+  }
+
+  fetchMeta (id) {
+    return this._registry.getContract('badgereg')
+      .then((badgeReg) => {
+        return Promise.all([
+          badgeReg.instance.meta.call({}, [id, 'TITLE']),
+          badgeReg.instance.meta.call({}, [id, 'IMG'])
+        ]);
+      })
+      .then(([ title, icon ]) => {
+        title = bytesToHex(title);
+        title = title === ZERO32 ? null : hex2Ascii(title);
+        if (bytesToHex(icon) === ZERO32) icon = null;
+        return { title, icon };
       });
   }
 

js/src/inject.js

@@ -0,0 +1,18 @@
+// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+import './parity';
+import './web3';

js/src/modals/FirstRun/firstRun.js

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import React, { Component, PropTypes } from 'react';
+import { connect } from 'react-redux';
 import ActionDone from 'material-ui/svg-icons/action/done';
 import ActionDoneAll from 'material-ui/svg-icons/action/done-all';
 import NavigationArrowForward from 'material-ui/svg-icons/navigation/arrow-forward';
@@ -35,14 +36,15 @@ import ParityLogo from '../../../assets/images/parity-logo-black-no-text.svg';
 
 const STAGE_NAMES = ['welcome', 'terms', 'new account', 'recovery', 'completed'];
 
-export default class FirstRun extends Component {
+class FirstRun extends Component {
   static contextTypes = {
     api: PropTypes.object.isRequired,
     store: PropTypes.object.isRequired
   }
 
   static propTypes = {
-    visible: PropTypes.bool,
+    hasAccounts: PropTypes.bool.isRequired,
+    visible: PropTypes.bool.isRequired,
     onClose: PropTypes.func.isRequired
   }
 
@@ -109,6 +111,7 @@ export default class FirstRun extends Component {
   }
 
   renderDialogActions () {
+    const { hasAccounts } = this.props;
     const { canCreate, stage, hasAcceptedTnc } = this.state;
 
     switch (stage) {
@@ -130,13 +133,26 @@ export default class FirstRun extends Component {
         );
 
       case 2:
-        return (
+        const buttons = [
           <Button
             icon={ <ActionDone /> }
             label='Create'
+            key='create'
             disabled={ !canCreate }
-            onClick={ this.onCreate } />
+            onClick={ this.onCreate }
-        );
+          />
+        ];
+        if (hasAccounts) {
+          buttons.unshift(
+            <Button
+              icon={ <NavigationArrowForward /> }
+              label='Skip'
+              key='skip'
+              onClick={ this.skipAccountCreation }
+            />
+          );
+        }
+        return buttons;
 
       case 3:
         return [
@@ -219,6 +235,10 @@ export default class FirstRun extends Component {
       });
   }
 
+  skipAccountCreation = () => {
+    this.setState({ stage: this.state.stage + 2 });
+  }
+
   newError = (error) => {
     const { store } = this.context;
 
@@ -232,3 +252,9 @@ export default class FirstRun extends Component {
     print(recoveryPage({ phrase, name, identity, address, logo: ParityLogo }));
   }
 }
+
+function mapStateToProps (state) {
+  return { hasAccounts: state.personal.hasAccounts };
+}
+
+export default connect(mapStateToProps, null)(FirstRun);

js/src/redux/providers/certifications/actions.js

@@ -14,10 +14,18 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+export const fetchCertifiers = () => ({
+  type: 'fetchCertifiers'
+});
+
 export const fetchCertifications = (address) => ({
   type: 'fetchCertifications', address
 });
 
-export const addCertification = (address, name, title, icon) => ({
+export const addCertification = (address, id, name, title, icon) => ({
-  type: 'addCertification', address, name, title, icon
+  type: 'addCertification', address, id, name, title, icon
+});
+
+export const removeCertification = (address, id) => ({
+  type: 'removeCertification', address, id
 });

js/src/redux/providers/certifications/middleware.js

@@ -14,38 +14,90 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-import Contracts from '~/contracts';
+import { uniq } from 'lodash';
-import { addCertification } from './actions';
 
-const knownCertifiers = [ 'smsverification' ];
+import ABI from '~/contracts/abi/certifier.json';
+import Contract from '~/api/contract';
+import Contracts from '~/contracts';
+import { addCertification, removeCertification } from './actions';
 
 export default class CertificationsMiddleware {
   toMiddleware () {
-    return (store) => (next) => (action) => {
+    const api = Contracts.get()._api;
-      if (action.type !== 'fetchCertifications') {
+    const badgeReg = Contracts.get().badgeReg;
-        return next(action);
+    const contract = new Contract(api, ABI);
-      }
+    const Confirmed = contract.events.find((e) => e.name === 'Confirmed');
+    const Revoked = contract.events.find((e) => e.name === 'Revoked');
 
-      const { address } = action;
+    let certifiers = [];
-      const badgeReg = Contracts.get().badgeReg;
+    let accounts = []; // these are addresses
 
-      knownCertifiers.forEach((name) => {
+    const fetchConfirmedEvents = (dispatch) => {
-        badgeReg.fetchCertifier(name)
+      if (certifiers.length === 0 || accounts.length === 0) return;
-          .then((cert) => {
+      api.eth.getLogs({
-            return badgeReg.checkIfCertified(cert.address, address)
+        fromBlock: 0,
-              .then((isCertified) => {
+        toBlock: 'latest',
-                if (isCertified) {
+        address: certifiers.map((c) => c.address),
-                  const { name, title, icon } = cert;
+        topics: [ [ Confirmed.signature, Revoked.signature ], accounts ]
-                  store.dispatch(addCertification(address, name, title, icon));
+      })
-                }
+        .then((logs) => contract.parseEventLogs(logs))
-              });
+        .then((logs) => {
-          })
+          logs.forEach((log) => {
-          .catch((err) => {
+            const certifier = certifiers.find((c) => c.address === log.address);
-            if (err) {
+            if (!certifier) {
-              console.error(`Failed to check if ${address} certified by ${name}:`, err);
+              throw new Error(`Could not find certifier at ${log.address}.`);
+            }
+            const { id, name, title, icon } = certifier;
+
+            if (log.event === 'Revoked') {
+              dispatch(removeCertification(log.params.who.value, id));
+            } else {
+              dispatch(addCertification(log.params.who.value, id, name, title, icon));
             }
           });
-      });
+        })
+        .catch((err) => {
+          console.error('Failed to fetch Confirmed events:', err);
+        });
+    };
+
+    return (store) => (next) => (action) => {
+      switch (action.type) {
+        case 'fetchCertifiers':
+          badgeReg.certifierCount().then((count) => {
+            new Array(+count).fill(null).forEach((_, id) => {
+              badgeReg.fetchCertifier(id)
+                .then((cert) => {
+                  if (!certifiers.some((c) => c.id === cert.id)) {
+                    certifiers = certifiers.concat(cert);
+                    fetchConfirmedEvents(store.dispatch);
+                  }
+                })
+                .catch((err) => {
+                  console.warn(`Could not fetch certifier ${id}:`, err);
+                });
+            });
+          });
+
+          break;
+        case 'fetchCertifications':
+          const { address } = action;
+
+          if (!accounts.includes(address)) {
+            accounts = accounts.concat(address);
+            fetchConfirmedEvents(store.dispatch);
+          }
+
+          break;
+        case 'setVisibleAccounts':
+          const { addresses } = action;
+          accounts = uniq(accounts.concat(addresses));
+          fetchConfirmedEvents(store.dispatch);
+
+          break;
+        default:
+          next(action);
+      }
     };
   }
 }

js/src/redux/providers/certifications/reducer.js

@@ -17,17 +17,27 @@
 const initialState = {};
 
 export default (state = initialState, action) => {
-  if (action.type !== 'addCertification') {
+  if (action.type === 'addCertification') {
-    return state;
+    const { address, id, name, icon, title } = action;
+    const certifications = state[address] || [];
+
+    if (certifications.some((c) => c.id === id)) {
+      return state;
+    }
+
+    const newCertifications = certifications.concat({
+      id, name, icon, title
+    });
+    return { ...state, [address]: newCertifications };
   }
 
-  const { address, name, icon, title } = action;
+  if (action.type === 'removeCertification') {
-  const certifications = state[address] || [];
+    const { address, id } = action;
+    const certifications = state[address] || [];
 
-  if (certifications.some((c) => c.name === name)) {
+    const newCertifications = certifications.filter((c) => c.id !== id);
-    return state;
+    return { ...state, [address]: newCertifications };
   }
-  const newCertifications = certifications.concat({ name, icon, title });
 
-  return { ...state, [address]: newCertifications };
+  return state;
 };

js/src/ui/Certifications/certifications.js

@@ -16,10 +16,8 @@
 
 import React, { Component, PropTypes } from 'react';
 import { connect } from 'react-redux';
-import { bindActionCreators } from 'redux';
 
 import { hashToImageUrl } from '~/redux/providers/imagesReducer';
-import { fetchCertifications } from '~/redux/providers/certifications/actions';
 
 import defaultIcon from '../../../assets/images/certifications/unknown.svg';
 
@@ -29,14 +27,7 @@ class Certifications extends Component {
   static propTypes = {
     account: PropTypes.string.isRequired,
     certifications: PropTypes.array.isRequired,
-    dappsUrl: PropTypes.string.isRequired,
+    dappsUrl: PropTypes.string.isRequired
-
-    fetchCertifications: PropTypes.func.isRequired
-  }
-
-  componentWillMount () {
-    const { account, fetchCertifications } = this.props;
-    fetchCertifications(account);
   }
 
   render () {
@@ -73,15 +64,13 @@ function mapStateToProps (_, initProps) {
 
   return (state) => {
     const certifications = state.certifications[account] || [];
-    return { certifications };
+    const dappsUrl = state.api.dappsUrl;
-  };
-}
 
-function mapDispatchToProps (dispatch) {
+    return { certifications, dappsUrl };
-  return bindActionCreators({ fetchCertifications }, dispatch);
+  };
 }
 
 export default connect(
   mapStateToProps,
-  mapDispatchToProps
+  null
 )(Certifications);

js/src/views/Account/Header/header.js

@@ -23,10 +23,6 @@ import Certifications from '~/ui/Certifications';
 import styles from './header.css';
 
 export default class Header extends Component {
-  static contextTypes = {
-    api: PropTypes.object
-  };
-
   static propTypes = {
     account: PropTypes.object,
     balance: PropTypes.object,
@@ -44,7 +40,6 @@ export default class Header extends Component {
   };
 
   render () {
-    const { api } = this.context;
     const { account, balance, className, children, hideName } = this.props;
     const { address, meta, uuid } = account;
 
@@ -85,7 +80,6 @@ export default class Header extends Component {
               balance={ balance } />
             <Certifications
               account={ account.address }
-              dappsUrl={ api.dappsUrl }
             />
           </div>
           { children }

js/src/views/Account/account.js

@@ -31,6 +31,7 @@ import shapeshiftBtn from '~/../assets/images/shapeshift-btn.png';
 import Header from './Header';
 import Transactions from './Transactions';
 import { setVisibleAccounts } from '~/redux/providers/personalActions';
+import { fetchCertifiers, fetchCertifications } from '~/redux/providers/certifications/actions';
 
 import SMSVerificationStore from '~/modals/Verification/sms-store';
 import EmailVerificationStore from '~/modals/Verification/email-store';
@@ -44,6 +45,8 @@ class Account extends Component {
 
   static propTypes = {
     setVisibleAccounts: PropTypes.func.isRequired,
+    fetchCertifiers: PropTypes.func.isRequired,
+    fetchCertifications: PropTypes.func.isRequired,
     images: PropTypes.object.isRequired,
 
     params: PropTypes.object,
@@ -63,6 +66,7 @@ class Account extends Component {
   }
 
   componentDidMount () {
+    this.props.fetchCertifiers();
     this.setVisibleAccounts();
   }
 
@@ -80,9 +84,10 @@ class Account extends Component {
   }
 
   setVisibleAccounts (props = this.props) {
-    const { params, setVisibleAccounts } = props;
+    const { params, setVisibleAccounts, fetchCertifications } = props;
     const addresses = [ params.address ];
     setVisibleAccounts(addresses);
+    fetchCertifications(params.address);
   }
 
   render () {
@@ -353,7 +358,9 @@ function mapStateToProps (state) {
 
 function mapDispatchToProps (dispatch) {
   return bindActionCreators({
-    setVisibleAccounts
+    setVisibleAccounts,
+    fetchCertifiers,
+    fetchCertifications
   }, dispatch);
 }
 

js/src/views/Accounts/List/list.js

@@ -15,22 +15,29 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 import React, { Component, PropTypes } from 'react';
+import { connect } from 'react-redux';
+import { bindActionCreators } from 'redux';
 
 import { Container } from '~/ui';
+import { fetchCertifiers, fetchCertifications } from '~/redux/providers/certifications/actions';
 
 import Summary from '../Summary';
 import styles from './list.css';
 
-export default class List extends Component {
+class List extends Component {
   static propTypes = {
     accounts: PropTypes.object,
-    walletsOwners: PropTypes.object,
     balances: PropTypes.object,
-    link: PropTypes.string,
+    certifications: PropTypes.object.isRequired,
-    search: PropTypes.array,
     empty: PropTypes.bool,
+    link: PropTypes.string,
     order: PropTypes.string,
     orderFallback: PropTypes.string,
+    search: PropTypes.array,
+    walletsOwners: PropTypes.object,
+
+    fetchCertifiers: PropTypes.func.isRequired,
+    fetchCertifications: PropTypes.func.isRequired,
     handleAddSearchToken: PropTypes.func
   };
 
@@ -42,8 +49,16 @@ export default class List extends Component {
     );
   }
 
+  componentWillMount () {
+    const { accounts, fetchCertifiers, fetchCertifications } = this.props;
+    fetchCertifiers();
+    for (let address in accounts) {
+      fetchCertifications(address);
+    }
+  }
+
   renderAccounts () {
-    const { accounts, balances, link, empty, handleAddSearchToken, walletsOwners } = this.props;
+    const { accounts, balances, empty, link, walletsOwners, handleAddSearchToken } = this.props;
 
     if (empty) {
       return (
@@ -72,7 +87,9 @@ export default class List extends Component {
             account={ account }
             balance={ balance }
             owners={ owners }
-            handleAddSearchToken={ handleAddSearchToken } />
+            handleAddSearchToken={ handleAddSearchToken }
+            showCertifications
+          />
         </div>
       );
     });
@@ -207,3 +224,20 @@ export default class List extends Component {
       });
   }
 }
+
+function mapStateToProps (state) {
+  const { certifications } = state;
+  return { certifications };
+}
+
+function mapDispatchToProps (dispatch) {
+  return bindActionCreators({
+    fetchCertifiers,
+    fetchCertifications
+  }, dispatch);
+}
+
+export default connect(
+  mapStateToProps,
+  mapDispatchToProps
+)(List);

js/src/views/Accounts/Summary/summary.js

@@ -21,6 +21,7 @@ import { isEqual } from 'lodash';
 import ReactTooltip from 'react-tooltip';
 
 import { Balance, Container, ContainerTitle, IdentityIcon, IdentityName, Tags, Input } from '~/ui';
+import Certifications from '~/ui/Certifications';
 import { nullableProptype } from '~/util/proptypes';
 
 import styles from '../accounts.css';
@@ -36,12 +37,14 @@ export default class Summary extends Component {
     link: PropTypes.string,
     name: PropTypes.string,
     noLink: PropTypes.bool,
+    showCertifications: PropTypes.bool,
     handleAddSearchToken: PropTypes.func,
     owners: nullableProptype(PropTypes.array)
   };
 
   static defaultProps = {
-    noLink: false
+    noLink: false,
+    showCertifications: false
   };
 
   shouldComponentUpdate (nextProps) {
@@ -115,6 +118,7 @@ export default class Summary extends Component {
 
         { this.renderOwners() }
         { this.renderBalance() }
+        { this.renderCertifications() }
       </Container>
     );
   }
@@ -181,4 +185,15 @@ export default class Summary extends Component {
       <Balance balance={ balance } />
     );
   }
+
+  renderCertifications () {
+    const { showCertifications, account } = this.props;
+    if (!showCertifications) {
+      return null;
+    }
+
+    return (
+      <Certifications account={ account.address } />
+    );
+  }
 }

js/src/views/Application/store.js

@@ -16,14 +16,17 @@
 
 import { action, observable } from 'mobx';
 
-const showFirstRun = window.localStorage.getItem('showFirstRun') !== '0';
-
 export default class Store {
-  @observable firstrunVisible = showFirstRun;
+  @observable firstrunVisible = false;
 
   constructor (api) {
     this._api = api;
 
+    const value = window.localStorage.getItem('showFirstRun');
+    if (value) {
+      this.firstrunVisible = JSON.parse(value);
+    }
+
     this._checkAccounts();
   }
 
@@ -33,7 +36,7 @@ export default class Store {
 
   @action toggleFirstrun = (visible = false) => {
     this.firstrunVisible = visible;
-    window.localStorage.setItem('showFirstRun', visible ? '1' : '0');
+    window.localStorage.setItem('showFirstRun', JSON.stringify(!!visible));
   }
 
   _checkAccounts () {

js/webpack/dev.server.js

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 const webpack = require('webpack');
+const WebpackStats = require('webpack/lib/Stats');
 const webpackDevMiddleware = require('webpack-dev-middleware');
 const webpackHotMiddleware = require('webpack-hot-middleware');
 
@@ -59,12 +60,24 @@ app.use(webpackHotMiddleware(compiler, {
 }));
 
 app.use(webpackDevMiddleware(compiler, {
-  noInfo: false,
+  noInfo: true,
-  quiet: true,
+  quiet: false,
   progress: true,
   publicPath: webpackConfig.output.publicPath,
   stats: {
     colors: true
+  },
+  reporter: function (data) {
+    // @see https://github.com/webpack/webpack/blob/324d309107f00cfc38ec727521563d309339b2ec/lib/Stats.js#L790
+    // Accepted values: none, errors-only, minimal, normal, verbose
+    const options = WebpackStats.presetToOptions('minimal');
+    options.timings = true;
+
+    const output = data.stats.toString(options);
+
+    process.stdout.write('\n');
+    process.stdout.write(output);
+    process.stdout.write('\n\n');
   }
 }));
 

js/webpack/libraries.js

@@ -28,7 +28,7 @@ module.exports = {
   context: path.join(__dirname, '../src'),
   entry: {
     // library
-    'inject': ['./web3.js'],
+    'inject': ['./inject.js'],
     'web3': ['./web3.js'],
     'parity': ['./parity.js']
   },

json/src/hash.rs

@@ -20,7 +20,7 @@ use std::str::FromStr;
 use serde::{Deserialize, Deserializer, Serialize, Serializer, Error};
 use serde::de::Visitor;
 use rustc_serialize::hex::ToHex;
-use util::hash::{H64 as Hash64, H160 as Hash160, H256 as Hash256, H2048 as Hash2048};
+use util::hash::{H64 as Hash64, H160 as Hash160, H256 as Hash256, H520 as Hash520, H2048 as Hash2048};
 
 
 macro_rules! impl_hash {
@@ -87,6 +87,7 @@ macro_rules! impl_hash {
 impl_hash!(H64, Hash64);
 impl_hash!(Address, Hash160);
 impl_hash!(H256, Hash256);
+impl_hash!(H520, Hash520);
 impl_hash!(Bloom, Hash2048);
 
 #[cfg(test)]

json/src/spec/engine.rs

@@ -19,6 +19,7 @@
 use spec::Ethash;
 use spec::BasicAuthority;
 use spec::AuthorityRound;
+use spec::Tendermint;
 
 /// Engine deserialization.
 #[derive(Debug, PartialEq, Deserialize)]
@@ -33,6 +34,8 @@ pub enum Engine {
 	BasicAuthority(BasicAuthority),
 	/// AuthorityRound engine.
 	AuthorityRound(AuthorityRound),
+	/// Tendermint engine.
+	Tendermint(Tendermint)
 }
 
 #[cfg(test)]

json/src/spec/mod.rs

@@ -27,15 +27,17 @@ pub mod state;
 pub mod ethash;
 pub mod basic_authority;
 pub mod authority_round;
+pub mod tendermint;
 
 pub use self::account::Account;
 pub use self::builtin::{Builtin, Pricing, Linear};
 pub use self::genesis::Genesis;
 pub use self::params::Params;
 pub use self::spec::Spec;
-pub use self::seal::{Seal, Ethereum, Generic};
+pub use self::seal::{Seal, Ethereum, AuthorityRoundSeal, TendermintSeal};
 pub use self::engine::Engine;
 pub use self::state::State;
 pub use self::ethash::{Ethash, EthashParams};
 pub use self::basic_authority::{BasicAuthority, BasicAuthorityParams};
 pub use self::authority_round::{AuthorityRound, AuthorityRoundParams};
+pub use self::tendermint::{Tendermint, TendermintParams};

json/src/spec/seal.rs

@@ -16,7 +16,8 @@
 
 //! Spec seal deserialization.
 
-use hash::{H64, H256};
+use hash::*;
+use uint::Uint;
 use bytes::Bytes;
 
 /// Ethereum seal.
@@ -29,11 +30,24 @@ pub struct Ethereum {
 	pub mix_hash: H256,
 }
 
-/// Generic seal.
+/// AuthorityRound seal.
 #[derive(Debug, PartialEq, Deserialize)]
-pub struct Generic {
+pub struct AuthorityRoundSeal {
-	/// Seal rlp.
+	/// Seal step.
-	pub rlp: Bytes,
+	pub step: Uint,
+	/// Seal signature.
+	pub signature: H520,
+}
+
+/// Tendermint seal.
+#[derive(Debug, PartialEq, Deserialize)]
+pub struct TendermintSeal {
+	/// Seal round.
+	pub round: Uint,
+	/// Proposal seal signature.
+	pub proposal: H520,
+	/// Proposal seal signature.
+	pub precommits: Vec<H520>,
 }
 
 /// Seal variants.
@@ -42,9 +56,15 @@ pub enum Seal {
 	/// Ethereum seal.
 	#[serde(rename="ethereum")]
 	Ethereum(Ethereum),
+	/// AuthorityRound seal.
+	#[serde(rename="authority_round")]
+	AuthorityRound(AuthorityRoundSeal),
+	/// Tendermint seal.
+	#[serde(rename="tendermint")]
+	Tendermint(TendermintSeal),
 	/// Generic seal.
 	#[serde(rename="generic")]
-	Generic(Generic),
+	Generic(Bytes),
 }
 
 #[cfg(test)]
@@ -53,15 +73,26 @@ mod tests {
 	use spec::Seal;
 
 	#[test]
-	fn builtin_deserialization() {
+	fn seal_deserialization() {
 		let s = r#"[{
 			"ethereum": {
 				"nonce": "0x0000000000000042",
 				"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
 			}
 		},{
-			"generic": {
+			"generic": "0xe011bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
-				"rlp": "0xe011bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"
+		},{
+			"authority_round": {
+				"step": "0x0",
+				"signature": "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+			}
+		},{
+			"tendermint": {
+				"round": "0x0",
+				"proposal": "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+				"precommits": [
+					"0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+				]
 			}
 		}]"#;
 		let _deserialized: Vec<Seal> = serde_json::from_str(s).unwrap();

json/src/spec/spec.rs

@@ -27,8 +27,8 @@ pub struct Spec {
 	/// Spec name.
 	pub name: String,
 	/// Special fork name.
-	#[serde(rename="forkName")]
+	#[serde(rename="dataDir")]
-	pub fork_name: Option<String>,
+	pub data_dir: Option<String>,
 	/// Engine.
 	pub engine: Engine,
 	/// Spec params.
@@ -57,6 +57,7 @@ mod tests {
 	fn spec_deserialization() {
 		let s = r#"{
 	"name": "Morden",
+	"dataDir": "morden",
 	"engine": {
 		"Ethash": {
 			"params": {

json/src/spec/tendermint.rs

@@ -0,0 +1,67 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Tendermint params deserialization.
+
+use uint::Uint;
+use hash::Address;
+
+/// Tendermint params deserialization.
+#[derive(Debug, PartialEq, Deserialize)]
+pub struct TendermintParams {
+	/// Gas limit divisor.
+	#[serde(rename="gasLimitBoundDivisor")]
+	pub gas_limit_bound_divisor: Uint,
+	/// Valid authorities
+	pub authorities: Vec<Address>,
+	/// Propose step timeout in milliseconds.
+	#[serde(rename="timeoutPropose")]
+	pub timeout_propose: Option<Uint>,
+	/// Prevote step timeout in milliseconds.
+	#[serde(rename="timeoutPrevote")]
+	pub timeout_prevote: Option<Uint>,
+	/// Precommit step timeout in milliseconds.
+	#[serde(rename="timeoutPrecommit")]
+	pub timeout_precommit: Option<Uint>,
+	/// Commit step timeout in milliseconds.
+	#[serde(rename="timeoutCommit")]
+	pub timeout_commit: Option<Uint>,
+}
+
+/// Tendermint engine deserialization.
+#[derive(Debug, PartialEq, Deserialize)]
+pub struct Tendermint {
+	/// Ethash params.
+	pub params: TendermintParams,
+}
+
+#[cfg(test)]
+mod tests {
+	use serde_json;
+	use spec::tendermint::Tendermint;
+
+	#[test]
+	fn basic_authority_deserialization() {
+		let s = r#"{
+			"params": {
+				"gasLimitBoundDivisor": "0x0400",
+				"authorities" : ["0xc6d9d2cd449a754c494264e1809c50e34d64562b"]
+			}
+		}"#;
+
+		let _deserialized: Tendermint = serde_json::from_str(s).unwrap();
+	}
+}

parity/account.rs

@@ -14,23 +14,32 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::path::PathBuf;
 use ethcore::ethstore::{EthStore, SecretStore, import_accounts, read_geth_accounts};
 use ethcore::ethstore::dir::DiskDirectory;
 use ethcore::account_provider::AccountProvider;
 use helpers::{password_prompt, password_from_file};
+use params::SpecType;
 
 #[derive(Debug, PartialEq)]
 pub enum AccountCmd {
 	New(NewAccount),
-	List(String),
+	List(ListAccounts),
 	Import(ImportAccounts),
 	ImportFromGeth(ImportFromGethAccounts)
 }
 
+#[derive(Debug, PartialEq)]
+pub struct ListAccounts {
+	pub path: String,
+	pub spec: SpecType,
+}
+
 #[derive(Debug, PartialEq)]
 pub struct NewAccount {
 	pub iterations: u32,
 	pub path: String,
+	pub spec: SpecType,
 	pub password_file: Option<String>,
 }
 
@@ -38,6 +47,7 @@ pub struct NewAccount {
 pub struct ImportAccounts {
 	pub from: Vec<String>,
 	pub to: String,
+	pub spec: SpecType,
 }
 
 /// Parameters for geth accounts' import 
@@ -47,18 +57,22 @@ pub struct ImportFromGethAccounts {
 	pub testnet: bool,
 	/// directory to import accounts to
 	pub to: String,
+	pub spec: SpecType,
 }
 
 pub fn execute(cmd: AccountCmd) -> Result<String, String> {
 	match cmd {
 		AccountCmd::New(new_cmd) => new(new_cmd),
-		AccountCmd::List(path) => list(path),
+		AccountCmd::List(list_cmd) => list(list_cmd),
 		AccountCmd::Import(import_cmd) => import(import_cmd),
 		AccountCmd::ImportFromGeth(import_geth_cmd) => import_geth(import_geth_cmd)
 	}
 }
 
-fn keys_dir(path: String) -> Result<DiskDirectory, String> {
+fn keys_dir(path: String, spec: SpecType) -> Result<DiskDirectory, String> {
+	let spec = try!(spec.spec());
+	let mut path = PathBuf::from(&path);
+	path.push(spec.data_dir);
 	DiskDirectory::create(path).map_err(|e| format!("Could not open keys directory: {}", e))
 }
 
@@ -75,15 +89,15 @@ fn new(n: NewAccount) -> Result<String, String> {
 		None => try!(password_prompt()),
 	};
 
-	let dir = Box::new(try!(keys_dir(n.path)));
+	let dir = Box::new(try!(keys_dir(n.path, n.spec)));
 	let secret_store = Box::new(try!(secret_store(dir, Some(n.iterations))));
 	let acc_provider = AccountProvider::new(secret_store);
 	let new_account = try!(acc_provider.new_account(&password).map_err(|e| format!("Could not create new account: {}", e)));
 	Ok(format!("{:?}", new_account))
 }
 
-fn list(path: String) -> Result<String, String> {
+fn list(list_cmd: ListAccounts) -> Result<String, String> {
-	let dir = Box::new(try!(keys_dir(path)));
+	let dir = Box::new(try!(keys_dir(list_cmd.path, list_cmd.spec)));
 	let secret_store = Box::new(try!(secret_store(dir, None)));
 	let acc_provider = AccountProvider::new(secret_store);
 	let accounts = acc_provider.accounts();
@@ -96,7 +110,7 @@ fn list(path: String) -> Result<String, String> {
 }
 
 fn import(i: ImportAccounts) -> Result<String, String> {
-	let to = try!(keys_dir(i.to));
+	let to = try!(keys_dir(i.to, i.spec));
 	let mut imported = 0;
 	for path in &i.from {
 		let from = DiskDirectory::at(path);
@@ -109,7 +123,7 @@ fn import_geth(i: ImportFromGethAccounts) -> Result<String, String> {
 	use std::io::ErrorKind;
 	use ethcore::ethstore::Error;
 
-	let dir = Box::new(try!(keys_dir(i.to)));
+	let dir = Box::new(try!(keys_dir(i.to, i.spec)));
 	let secret_store = Box::new(try!(secret_store(dir, None)));
 	let geth_accounts = read_geth_accounts(i.testnet);
 	match secret_store.import_geth_accounts(geth_accounts, i.testnet) {

parity/blockchain.rs

@@ -64,11 +64,19 @@ impl FromStr for DataFormat {
 
 #[derive(Debug, PartialEq)]
 pub enum BlockchainCmd {
+	Kill(KillBlockchain),
 	Import(ImportBlockchain),
 	Export(ExportBlockchain),
 	ExportState(ExportState),
 }
 
+#[derive(Debug, PartialEq)]
+pub struct KillBlockchain {
+	pub spec: SpecType,
+	pub dirs: Directories,
+	pub pruning: Pruning,
+}
+
 #[derive(Debug, PartialEq)]
 pub struct ImportBlockchain {
 	pub spec: SpecType,
@@ -128,6 +136,7 @@ pub struct ExportState {
 
 pub fn execute(cmd: BlockchainCmd) -> Result<String, String> {
 	match cmd {
+		BlockchainCmd::Kill(kill_cmd) => kill_db(kill_cmd),
 		BlockchainCmd::Import(import_cmd) => execute_import(import_cmd),
 		BlockchainCmd::Export(export_cmd) => execute_export(export_cmd),
 		BlockchainCmd::ExportState(export_cmd) => execute_export_state(export_cmd),
@@ -140,9 +149,6 @@ fn execute_import(cmd: ImportBlockchain) -> Result<String, String> {
 	// Setup panic handler
 	let panic_handler = PanicHandler::new_in_arc();
 
-	// create dirs used by parity
-	try!(cmd.dirs.create_dirs(false, false));
-
 	// load spec file
 	let spec = try!(cmd.spec.spec());
 
@@ -150,7 +156,7 @@ fn execute_import(cmd: ImportBlockchain) -> Result<String, String> {
 	let genesis_hash = spec.genesis_header().hash();
 
 	// database paths
-	let db_dirs = cmd.dirs.database(genesis_hash, spec.fork_name.clone());
+	let db_dirs = cmd.dirs.database(genesis_hash, None, spec.data_dir.clone());
 
 	// user defaults path
 	let user_defaults_path = db_dirs.user_defaults_path();
@@ -174,7 +180,10 @@ fn execute_import(cmd: ImportBlockchain) -> Result<String, String> {
 	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile(db_dirs.fork_path().as_path())));
+	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile(db_dirs.db_root_path().as_path())));
+
+	// create dirs used by parity
+	try!(cmd.dirs.create_dirs(false, false));
 
 	// prepare client config
 	let mut client_config = to_client_config(
@@ -311,9 +320,6 @@ fn start_client(
 	wal: bool,
 	cache_config: CacheConfig) -> Result<ClientService, String> {
 
-	// create dirs used by parity
-	try!(dirs.create_dirs(false, false));
-
 	// load spec file
 	let spec = try!(spec.spec());
 
@@ -321,7 +327,7 @@ fn start_client(
 	let genesis_hash = spec.genesis_header().hash();
 
 	// database paths
-	let db_dirs = dirs.database(genesis_hash, spec.fork_name.clone());
+	let db_dirs = dirs.database(genesis_hash, None, spec.data_dir.clone());
 
 	// user defaults path
 	let user_defaults_path = db_dirs.user_defaults_path();
@@ -345,7 +351,10 @@ fn start_client(
 	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&db_dirs, algorithm, compaction.compaction_profile(db_dirs.fork_path().as_path())));
+	try!(execute_upgrades(&db_dirs, algorithm, compaction.compaction_profile(db_dirs.db_root_path().as_path())));
+
+	// create dirs used by parity
+	try!(dirs.create_dirs(false, false));
 
 	// prepare client config
 	let client_config = to_client_config(&cache_config, Mode::Active, tracing, fat_db, compaction, wal, VMType::default(), "".into(), algorithm, pruning_history, true);
@@ -473,6 +482,18 @@ fn execute_export_state(cmd: ExportState) -> Result<String, String> {
 	Ok("Export completed.".into())
 }
 
+pub fn kill_db(cmd: KillBlockchain) -> Result<String, String> {
+	let spec = try!(cmd.spec.spec());
+	let genesis_hash = spec.genesis_header().hash();
+	let db_dirs = cmd.dirs.database(genesis_hash, None, spec.data_dir);
+	let user_defaults_path = db_dirs.user_defaults_path();
+	let user_defaults = try!(UserDefaults::load(&user_defaults_path));
+	let algorithm = cmd.pruning.to_algorithm(&user_defaults);
+	let dir = db_dirs.db_path(algorithm);
+	try!(fs::remove_dir_all(&dir).map_err(|e| format!("Error removing database: {:?}", e)));
+	Ok("Database deleted.".to_owned())
+}
+
 #[cfg(test)]
 mod test {
 	use super::DataFormat;

parity/cli/mod.rs

@@ -16,6 +16,7 @@
 
 #[macro_use]
 mod usage;
+use dir::default_data_path;
 
 usage! {
 	{
@@ -38,6 +39,8 @@ usage! {
 		cmd_ui: bool,
 		cmd_tools: bool,
 		cmd_hash: bool,
+		cmd_kill: bool,
+		cmd_db: bool,
 
 		// Arguments
 		arg_pid_file: String,
@@ -83,8 +86,8 @@ usage! {
 		flag_mode_timeout: u64 = 300u64, or |c: &Config| otry!(c.parity).mode_timeout.clone(),
 		flag_mode_alarm: u64 = 3600u64, or |c: &Config| otry!(c.parity).mode_alarm.clone(),
 		flag_chain: String = "homestead", or |c: &Config| otry!(c.parity).chain.clone(),
-		flag_db_path: String = "$HOME/.parity", or |c: &Config| otry!(c.parity).db_path.clone(),
+		flag_db_path: String = default_data_path(), or |c: &Config| otry!(c.parity).db_path.clone(),
-		flag_keys_path: String = "$HOME/.parity/keys", or |c: &Config| otry!(c.parity).keys_path.clone(),
+		flag_keys_path: String = "$DATA/keys", or |c: &Config| otry!(c.parity).keys_path.clone(),
 		flag_identity: String = "", or |c: &Config| otry!(c.parity).identity.clone(),
 
 		// -- Account Options
@@ -103,7 +106,7 @@ usage! {
 			or |c: &Config| otry!(c.ui).port.clone(),
 		flag_ui_interface: String = "local",
 			or |c: &Config| otry!(c.ui).interface.clone(),
-		flag_ui_path: String = "$HOME/.parity/signer",
+		flag_ui_path: String = "$DATA/signer",
 			or |c: &Config| otry!(c.ui).path.clone(),
 		// NOTE [todr] For security reasons don't put this to config files
 		flag_ui_no_validation: bool = false, or |_| None,
@@ -159,7 +162,7 @@ usage! {
 		// IPC
 		flag_no_ipc: bool = false,
 			or |c: &Config| otry!(c.ipc).disable.clone(),
-		flag_ipc_path: String = "$HOME/.parity/jsonrpc.ipc",
+		flag_ipc_path: String = "$DATA/jsonrpc.ipc",
 			or |c: &Config| otry!(c.ipc).path.clone(),
 		flag_ipc_apis: String = "web3,eth,net,parity,parity_accounts,traces,rpc",
 			or |c: &Config| otry!(c.ipc).apis.clone().map(|vec| vec.join(",")),
@@ -173,7 +176,7 @@ usage! {
 			or |c: &Config| otry!(c.dapps).interface.clone(),
 		flag_dapps_hosts: String = "none",
 			or |c: &Config| otry!(c.dapps).hosts.clone().map(|vec| vec.join(",")),
-		flag_dapps_path: String = "$HOME/.parity/dapps",
+		flag_dapps_path: String = "$DATA/dapps",
 			or |c: &Config| otry!(c.dapps).path.clone(),
 		flag_dapps_user: Option<String> = None,
 			or |c: &Config| otry!(c.dapps).user.clone().map(Some),
@@ -274,7 +277,7 @@ usage! {
 			or |c: &Config| otry!(c.vm).jit.clone(),
 
 		// -- Miscellaneous Options
-		flag_config: String = "$HOME/.parity/config.toml", or |_| None,
+		flag_config: String = "$DATA/config.toml", or |_| None,
 		flag_logging: Option<String> = None,
 			or |c: &Config| otry!(c.misc).logging.clone().map(Some),
 		flag_log_file: Option<String> = None,
@@ -517,6 +520,8 @@ mod tests {
 			cmd_ui: false,
 			cmd_tools: false,
 			cmd_hash: false,
+			cmd_db: false,
+			cmd_kill: false,
 
 			// Arguments
 			arg_pid_file: "".into(),
@@ -671,7 +676,7 @@ mod tests {
 
 			// -- Miscellaneous Options
 			flag_version: false,
-			flag_config: "$HOME/.parity/config.toml".into(),
+			flag_config: "$DATA/config.toml".into(),
 			flag_logging: Some("own_tx=trace".into()),
 			flag_log_file: Some("/var/log/parity.log".into()),
 			flag_no_color: false,

parity/cli/usage.rs

@@ -145,7 +145,7 @@ macro_rules! usage {
 				}
 
 				let config_file = raw_args.flag_config.clone().unwrap_or_else(|| raw_args.clone().into_args(Config::default()).flag_config);
-				let config_file = replace_home(&config_file);
+				let config_file = replace_home("", &config_file);
 				let config = match (fs::File::open(&config_file), raw_args.flag_config.is_some()) {
 					// Load config file
 					(Ok(mut file), _) => {

parity/cli/usage.txt

@@ -18,6 +18,7 @@ Usage:
   parity snapshot <file> [options]
   parity restore [ <file> ] [options]
   parity tools hash <file>
+  parity db kill [options]
 
 Operating Options:
   --mode MODE              Set the operating mode. MODE can be one of:
@@ -285,10 +286,8 @@ Import/Export Options:
                            (default: {flag_format:?} = Import: auto, Export: binary)
   --no-seal-check          Skip block seal check. (default: {flag_no_seal_check})
   --at BLOCK               Export state at the given block, which may be an
-                           index, hash, or 'latest'. Note that taking snapshots at
+                           index, hash, or 'latest'. (default: {flag_at})
-                           non-recent blocks will only work with --pruning archive
+  --no-storage             Don't export account storage. (default: {flag_no_storage})
-                           (default: {flag_at})
-  --no-storage             Don't export account storge. (default: {flag_no_storage})
   --no-code                Don't export account code. (default: {flag_no_code})
   --min-balance WEI        Don't export accounts with balance less than specified.
                            (default: {flag_min_balance:?})

parity/configuration.rs

@@ -38,9 +38,9 @@ use dir::Directories;
 use dapps::Configuration as DappsConfiguration;
 use signer::{Configuration as SignerConfiguration};
 use run::RunCmd;
-use blockchain::{BlockchainCmd, ImportBlockchain, ExportBlockchain, ExportState, DataFormat};
+use blockchain::{BlockchainCmd, ImportBlockchain, ExportBlockchain, KillBlockchain, ExportState, DataFormat};
 use presale::ImportWallet;
-use account::{AccountCmd, NewAccount, ImportAccounts, ImportFromGethAccounts};
+use account::{AccountCmd, NewAccount, ListAccounts, ImportAccounts, ImportFromGethAccounts};
 use snapshot::{self, SnapshotCommand};
 
 const AUTHCODE_FILENAME: &'static str = "authcodes";
@@ -152,20 +152,32 @@ impl Configuration {
 			}
 		} else if self.args.cmd_tools && self.args.cmd_hash {
 			Cmd::Hash(self.args.arg_file)
+		} else if self.args.cmd_db && self.args.cmd_kill {
+			Cmd::Blockchain(BlockchainCmd::Kill(KillBlockchain {
+				spec: spec,
+				dirs: dirs,
+				pruning: pruning,
+			}))
 		} else if self.args.cmd_account {
 			let account_cmd = if self.args.cmd_new {
 				let new_acc = NewAccount {
 					iterations: self.args.flag_keys_iterations,
 					path: dirs.keys,
+					spec: spec,
 					password_file: self.args.flag_password.first().cloned(),
 				};
 				AccountCmd::New(new_acc)
 			} else if self.args.cmd_list {
-				AccountCmd::List(dirs.keys)
+				let list_acc = ListAccounts {
+					path: dirs.keys,
+					spec: spec,
+				};
+				AccountCmd::List(list_acc)
 			} else if self.args.cmd_import {
 				let import_acc = ImportAccounts {
 					from: self.args.arg_path.clone(),
 					to: dirs.keys,
+					spec: spec,
 				};
 				AccountCmd::Import(import_acc)
 			} else {
@@ -175,6 +187,7 @@ impl Configuration {
 		} else if self.args.flag_import_geth_keys {
         	let account_cmd = AccountCmd::ImportFromGeth(
 				ImportFromGethAccounts {
+					spec: spec,
 					to: dirs.keys,
 					testnet: self.args.flag_testnet
 				}
@@ -184,6 +197,7 @@ impl Configuration {
 			let presale_cmd = ImportWallet {
 				iterations: self.args.flag_keys_iterations,
 				path: dirs.keys,
+				spec: spec,
 				wallet_path: self.args.arg_path.first().unwrap().clone(),
 				password_file: self.args.flag_password.first().cloned(),
 			};
@@ -575,7 +589,7 @@ impl Configuration {
 		ret.snapshot_peers = self.snapshot_peers();
 		ret.allow_ips = try!(self.allow_ips());
 		ret.max_pending_peers = self.max_pending_peers();
-		let mut net_path = PathBuf::from(self.directories().db);
+		let mut net_path = PathBuf::from(self.directories().data);
 		net_path.push("network");
 		ret.config_path = Some(net_path.to_str().unwrap().to_owned());
 		ret.reserved_nodes = try!(self.init_reserved_nodes());
@@ -669,18 +683,11 @@ impl Configuration {
 	fn directories(&self) -> Directories {
 		use util::path;
 
-		let db_path = replace_home(self.args.flag_datadir.as_ref().unwrap_or(&self.args.flag_db_path));
+		let data_path = replace_home("", self.args.flag_datadir.as_ref().unwrap_or(&self.args.flag_db_path));
 
-		let keys_path = replace_home(
+		let keys_path = replace_home(&data_path, &self.args.flag_keys_path);
-			if self.args.flag_testnet {
+		let dapps_path = replace_home(&data_path, &self.args.flag_dapps_path);
-				"$HOME/.parity/testnet_keys"
+		let ui_path = replace_home(&data_path, &self.args.flag_ui_path);
-			} else {
-				&self.args.flag_keys_path
-			}
-		);
-
-		let dapps_path = replace_home(&self.args.flag_dapps_path);
-		let ui_path = replace_home(&self.args.flag_ui_path);
 
 		if self.args.flag_geth  && !cfg!(windows) {
 			let geth_root  = if self.args.flag_testnet { path::ethereum::test() } else {  path::ethereum::default() };
@@ -689,7 +696,7 @@ impl Configuration {
 		}
 
 		if cfg!(feature = "ipc") && !cfg!(feature = "windows") {
-			let mut path_buf = PathBuf::from(db_path.clone());
+			let mut path_buf = PathBuf::from(data_path.clone());
 			path_buf.push("ipc");
 			let ipc_path = path_buf.to_str().unwrap();
 			::std::fs::create_dir_all(ipc_path).unwrap_or_else(
@@ -699,7 +706,7 @@ impl Configuration {
 
 		Directories {
 			keys: keys_path,
-			db: db_path,
+			data: data_path,
 			dapps: dapps_path,
 			signer: ui_path,
 		}
@@ -709,7 +716,7 @@ impl Configuration {
 		if self.args.flag_geth {
 			geth_ipc_path(self.args.flag_testnet)
 		} else {
-			parity_ipc_path(&self.args.flag_ipcpath.clone().unwrap_or(self.args.flag_ipc_path.clone()))
+			parity_ipc_path(&self.directories().data, &self.args.flag_ipcpath.clone().unwrap_or(self.args.flag_ipc_path.clone()))
 		}
 	}
 
@@ -777,12 +784,14 @@ mod tests {
 	use ethcore_rpc::NetworkSettings;
 	use ethcore::client::{VMType, BlockId};
 	use ethcore::miner::{MinerOptions, PrioritizationStrategy};
-	use helpers::{replace_home, default_network_config};
+	use helpers::{default_network_config};
 	use run::RunCmd;
+	use dir::Directories;
 	use signer::{Configuration as SignerConfiguration};
 	use blockchain::{BlockchainCmd, ImportBlockchain, ExportBlockchain, DataFormat, ExportState};
 	use presale::ImportWallet;
-	use account::{AccountCmd, NewAccount, ImportAccounts};
+	use params::SpecType;
+	use account::{AccountCmd, NewAccount, ImportAccounts, ListAccounts};
 	use devtools::{RandomTempPath};
 	use std::io::Write;
 	use std::fs::{File, create_dir};
@@ -809,8 +818,9 @@ mod tests {
 		let conf = parse(&args);
 		assert_eq!(conf.into_command().unwrap().cmd, Cmd::Account(AccountCmd::New(NewAccount {
 			iterations: 10240,
-			path: replace_home("$HOME/.parity/keys"),
+			path: Directories::default().keys,
 			password_file: None,
+			spec: SpecType::default(),
 		})));
 	}
 
@@ -819,7 +829,10 @@ mod tests {
 		let args = vec!["parity", "account", "list"];
 		let conf = parse(&args);
 		assert_eq!(conf.into_command().unwrap().cmd, Cmd::Account(
-			AccountCmd::List(replace_home("$HOME/.parity/keys")),
+			AccountCmd::List(ListAccounts {
+				path: Directories::default().keys,
+				spec: SpecType::default(),
+			})
 		));
 	}
 
@@ -829,7 +842,8 @@ mod tests {
 		let conf = parse(&args);
 		assert_eq!(conf.into_command().unwrap().cmd, Cmd::Account(AccountCmd::Import(ImportAccounts {
 			from: vec!["my_dir".into(), "another_dir".into()],
-			to: replace_home("$HOME/.parity/keys"),
+			to: Directories::default().keys,
+			spec: SpecType::default(),
 		})));
 	}
 
@@ -839,9 +853,10 @@ mod tests {
 		let conf = parse(&args);
 		assert_eq!(conf.into_command().unwrap().cmd, Cmd::ImportPresaleWallet(ImportWallet {
 			iterations: 10240,
-			path: replace_home("$HOME/.parity/keys"),
+			path: Directories::default().keys,
 			wallet_path: "my_wallet.json".into(),
 			password_file: Some("pwd".into()),
+			spec: SpecType::default(),
 		}));
 	}
 
@@ -940,7 +955,7 @@ mod tests {
 	fn test_command_signer_new_token() {
 		let args = vec!["parity", "signer", "new-token"];
 		let conf = parse(&args);
-		let expected = replace_home("$HOME/.parity/signer");
+		let expected = Directories::default().signer;
 		assert_eq!(conf.into_command().unwrap().cmd, Cmd::SignerToken(SignerConfiguration {
 			enabled: true,
 			signer_path: expected,

parity/dapps.rs

@@ -20,6 +20,7 @@ use rpc_apis;
 use ethcore::client::Client;
 use ethsync::SyncProvider;
 use helpers::replace_home;
+use dir::default_data_path;
 
 #[derive(Debug, PartialEq, Clone)]
 pub struct Configuration {
@@ -34,6 +35,7 @@ pub struct Configuration {
 
 impl Default for Configuration {
 	fn default() -> Self {
+		let data_dir = default_data_path();
 		Configuration {
 			enabled: true,
 			interface: "127.0.0.1".into(),
@@ -41,7 +43,7 @@ impl Default for Configuration {
 			hosts: Some(Vec::new()),
 			user: None,
 			pass: None,
-			dapps_path: replace_home("$HOME/.parity/dapps"),
+			dapps_path: replace_home(&data_dir, "$DATA/dapps"),
 		}
 	}
 }

parity/dir.rs

@@ -19,6 +19,7 @@ use std::path::{PathBuf, Path};
 use util::{H64, H256};
 use util::journaldb::Algorithm;
 use helpers::replace_home;
+use app_dirs::{AppInfo, get_app_root, AppDataType};
 
 // this const is irrelevent cause we do have migrations now,
 // but we still use it for backwards compatibility
@@ -26,7 +27,7 @@ const LEGACY_CLIENT_DB_VER_STR: &'static str = "5.3";
 
 #[derive(Debug, PartialEq)]
 pub struct Directories {
-	pub db: String,
+	pub data: String,
 	pub keys: String,
 	pub signer: String,
 	pub dapps: String,
@@ -34,18 +35,19 @@ pub struct Directories {
 
 impl Default for Directories {
 	fn default() -> Self {
+		let data_dir = default_data_path();
 		Directories {
-			db: replace_home("$HOME/.parity"),
+			data: replace_home(&data_dir, "$DATA"),
-			keys: replace_home("$HOME/.parity/keys"),
+			keys: replace_home(&data_dir, "$DATA/keys"),
-			signer: replace_home("$HOME/.parity/signer"),
+			signer: replace_home(&data_dir, "$DATA/signer"),
-			dapps: replace_home("$HOME/.parity/dapps"),
+			dapps: replace_home(&data_dir, "$DATA/dapps"),
 		}
 	}
 }
 
 impl Directories {
 	pub fn create_dirs(&self, dapps_enabled: bool, signer_enabled: bool) -> Result<(), String> {
-		try!(fs::create_dir_all(&self.db).map_err(|e| e.to_string()));
+		try!(fs::create_dir_all(&self.data).map_err(|e| e.to_string()));
 		try!(fs::create_dir_all(&self.keys).map_err(|e| e.to_string()));
 		if signer_enabled {
 			try!(fs::create_dir_all(&self.signer).map_err(|e| e.to_string()));
@@ -57,20 +59,38 @@ impl Directories {
 	}
 
 	/// Database paths.
-	pub fn database(&self, genesis_hash: H256, fork_name: Option<String>) -> DatabaseDirectories {
+	pub fn database(&self, genesis_hash: H256, fork_name: Option<String>, spec_name: String) -> DatabaseDirectories {
 		DatabaseDirectories {
-			path: self.db.clone(),
+			path: self.data.clone(),
 			genesis_hash: genesis_hash,
 			fork_name: fork_name,
+			spec_name: spec_name,
 		}
 	}
 
 	/// Get the ipc sockets path
 	pub fn ipc_path(&self) -> PathBuf {
-		let mut dir = Path::new(&self.db).to_path_buf();
+		let mut dir = Path::new(&self.data).to_path_buf();
 		dir.push("ipc");
 		dir
 	}
+
+	// TODO: remove in 1.7
+	pub fn legacy_keys_path(&self, testnet: bool) -> PathBuf {
+		let mut dir = Path::new(&self.data).to_path_buf();
+		if testnet {
+			dir.push("testnet_keys");
+		} else {
+			dir.push("keys");
+		}
+		dir
+	}
+
+	pub fn keys_path(&self, spec_name: &str) -> PathBuf {
+		let mut dir = PathBuf::from(&self.keys);
+		dir.push(spec_name);
+		dir
+	}
 }
 
 #[derive(Debug, PartialEq)]
@@ -78,52 +98,103 @@ pub struct DatabaseDirectories {
 	pub path: String,
 	pub genesis_hash: H256,
 	pub fork_name: Option<String>,
+	pub spec_name: String,
 }
 
 impl DatabaseDirectories {
 	/// Base DB directory for the given fork.
-	pub fn fork_path(&self) -> PathBuf {
+	// TODO: remove in 1.7
+	pub fn legacy_fork_path(&self) -> PathBuf {
 		let mut dir = Path::new(&self.path).to_path_buf();
 		dir.push(format!("{:?}{}", H64::from(self.genesis_hash), self.fork_name.as_ref().map(|f| format!("-{}", f)).unwrap_or_default()));
 		dir
 	}
 
-	/// Get the root path for database
+	pub fn spec_root_path(&self) -> PathBuf {
-	pub fn version_path(&self, pruning: Algorithm) -> PathBuf {
+		let mut dir = Path::new(&self.path).to_path_buf();
-		let mut dir = self.fork_path();
+		dir.push("chains");
-		dir.push(format!("v{}-sec-{}", LEGACY_CLIENT_DB_VER_STR, pruning.as_internal_name_str()));
+		dir.push(&self.spec_name);
 		dir
 	}
 
-	/// Get the path for the databases given the genesis_hash and information on the databases.
 	pub fn client_path(&self, pruning: Algorithm) -> PathBuf {
-		let mut dir = self.version_path(pruning);
+		let mut dir = self.db_root_path();
+		dir.push(pruning.as_internal_name_str());
 		dir.push("db");
 		dir
 	}
 
+	pub fn db_root_path(&self) -> PathBuf {
+		let mut dir = self.spec_root_path();
+		dir.push("db");
+		dir.push(H64::from(self.genesis_hash).hex());
+		dir
+	}
+
+	pub fn db_path(&self, pruning: Algorithm) -> PathBuf {
+		let mut dir = self.db_root_path();
+		dir.push(pruning.as_internal_name_str());
+		dir
+	}
+
+	/// Get the root path for database
+	// TODO: remove in 1.7
+	pub fn legacy_version_path(&self, pruning: Algorithm) -> PathBuf {
+		let mut dir = self.legacy_fork_path();
+		dir.push(format!("v{}-sec-{}", LEGACY_CLIENT_DB_VER_STR, pruning.as_internal_name_str()));
+		dir
+	}
+
 	/// Get user defaults path
+	// TODO: remove in 1.7
+	pub fn legacy_user_defaults_path(&self) -> PathBuf {
+		let mut dir = self.legacy_fork_path();
+		dir.push("user_defaults");
+		dir
+	}
+
+	/// Get user defaults path
+	// TODO: remove in 1.7
+	pub fn legacy_snapshot_path(&self) -> PathBuf {
+		let mut dir = self.legacy_fork_path();
+		dir.push("snapshot");
+		dir
+	}
+
+	/// Get user defaults path
+	// TODO: remove in 1.7
+	pub fn legacy_network_path(&self) -> PathBuf {
+		let mut dir = self.legacy_fork_path();
+		dir.push("network");
+		dir
+	}
+
 	pub fn user_defaults_path(&self) -> PathBuf {
-		let mut dir = self.fork_path();
+		let mut dir = self.spec_root_path();
 		dir.push("user_defaults");
 		dir
 	}
 
 	/// Get the path for the snapshot directory given the genesis hash and fork name.
 	pub fn snapshot_path(&self) -> PathBuf {
-		let mut dir = self.fork_path();
+		let mut dir = self.db_root_path();
 		dir.push("snapshot");
 		dir
 	}
 
 	/// Get the path for the network directory.
 	pub fn network_path(&self) -> PathBuf {
-		let mut dir = self.fork_path();
+		let mut dir = self.spec_root_path();
 		dir.push("network");
 		dir
 	}
 }
 
+pub fn default_data_path() -> String {
+	let app_info = AppInfo { name: "parity", author: "parity" };
+	get_app_root(AppDataType::UserData, &app_info).map(|p| p.to_string_lossy().into_owned()).unwrap_or_else(|_| "$HOME/.parity".to_owned())
+}
+
 #[cfg(test)]
 mod tests {
 	use super::Directories;
@@ -131,11 +202,12 @@ mod tests {
 
 	#[test]
 	fn test_default_directories() {
+		let data_dir = super::default_data_path();
 		let expected = Directories {
-			db: replace_home("$HOME/.parity"),
+			data: replace_home(&data_dir, "$DATA"),
-			keys: replace_home("$HOME/.parity/keys"),
+			keys: replace_home(&data_dir, "$DATA/keys"),
-			signer: replace_home("$HOME/.parity/signer"),
+			signer: replace_home(&data_dir, "$DATA/signer"),
-			dapps: replace_home("$HOME/.parity/dapps"),
+			dapps: replace_home(&data_dir, "$DATA/dapps"),
 		};
 		assert_eq!(expected, Directories::default());
 	}

parity/helpers.rs

@@ -24,7 +24,7 @@ use ethcore::client::{Mode, BlockId, VMType, DatabaseCompactionProfile, ClientCo
 use ethcore::miner::{PendingSet, GasLimit, PrioritizationStrategy};
 use cache::CacheConfig;
 use dir::DatabaseDirectories;
-use upgrade::upgrade;
+use upgrade::{upgrade, upgrade_data_paths};
 use migration::migrate;
 use ethsync::is_valid_node_url;
 
@@ -132,9 +132,10 @@ pub fn to_price(s: &str) -> Result<f32, String> {
 }
 
 /// Replaces `$HOME` str with home directory path.
-pub fn replace_home(arg: &str) -> String {
+pub fn replace_home(base: &str, arg: &str) -> String {
 	// the $HOME directory on mac os should be `~/Library` or `~/Library/Application Support`
 	let r = arg.replace("$HOME", env::home_dir().unwrap().to_str().unwrap());
+	let r = r.replace("$DATA", base	);
 	r.replace("/", &::std::path::MAIN_SEPARATOR.to_string()	)
 }
 
@@ -159,13 +160,13 @@ pub fn geth_ipc_path(testnet: bool) -> String {
 }
 
 /// Formats and returns parity ipc path.
-pub fn parity_ipc_path(s: &str) -> String {
+pub fn parity_ipc_path(base: &str, s: &str) -> String {
 	// Windows path should not be hardcoded here.
 	if cfg!(windows) {
 		return r"\\.\pipe\parity.jsonrpc".to_owned();
 	}
 
-	replace_home(s)
+	replace_home(base, s)
 }
 
 /// Validates and formats bootnodes option.
@@ -187,7 +188,7 @@ pub fn to_bootnodes(bootnodes: &Option<String>) -> Result<Vec<String>, String> {
 pub fn default_network_config() -> ::ethsync::NetworkConfiguration {
 	use ethsync::{NetworkConfiguration, AllowIP};
 	NetworkConfiguration {
-		config_path: Some(replace_home("$HOME/.parity/network")),
+		config_path: Some(replace_home(&::dir::default_data_path(), "$DATA/network")),
 		net_config_path: None,
 		listen_address: Some("0.0.0.0:30303".into()),
 		public_address: None,
@@ -261,6 +262,8 @@ pub fn execute_upgrades(
 	compaction_profile: CompactionProfile
 ) -> Result<(), String> {
 
+	upgrade_data_paths(dirs, pruning);
+
 	match upgrade(Some(&dirs.path)) {
 		Ok(upgrades_applied) if upgrades_applied > 0 => {
 			debug!("Executed {} upgrade scripts - ok", upgrades_applied);
@@ -271,7 +274,7 @@ pub fn execute_upgrades(
 		_ => {},
 	}
 
-	let client_path = dirs.version_path(pruning);
+	let client_path = dirs.db_path(pruning);
 	migrate(&client_path, pruning, compaction_profile).map_err(|e| format!("{}", e))
 }
 

parity/informant.rs

@@ -23,7 +23,7 @@ use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
 use std::time::{Instant, Duration};
 use isatty::{stdout_isatty};
 use ethsync::{SyncProvider, ManageNetwork};
-use util::{Uint, RwLock, Mutex, H256, Colour};
+use util::{Uint, RwLock, Mutex, H256, Colour, Bytes};
 use ethcore::client::*;
 use ethcore::views::BlockView;
 use ethcore::snapshot::service::Service as SnapshotService;
@@ -176,14 +176,13 @@ impl Informant {
 }
 
 impl ChainNotify for Informant {
-	fn new_blocks(&self, imported: Vec<H256>, _invalid: Vec<H256>, _enacted: Vec<H256>, _retracted: Vec<H256>, _sealed: Vec<H256>, duration: u64) {
+	fn new_blocks(&self, imported: Vec<H256>, _invalid: Vec<H256>, _enacted: Vec<H256>, _retracted: Vec<H256>, _sealed: Vec<H256>, _proposed: Vec<Bytes>, duration: u64) {
 		let mut last_import = self.last_import.lock();
 		let sync_state = self.sync.as_ref().map(|s| s.status().state);
 		let importing = is_major_importing(sync_state, self.client.queue_info());
-
 		let ripe = Instant::now() > *last_import + Duration::from_secs(1) && !importing;
 		let txs_imported = imported.iter()
-			.take(imported.len() - if ripe {1} else {0})
+			.take(imported.len().saturating_sub(if ripe { 1 } else { 0 }))
 			.filter_map(|h| self.client.block(BlockId::Hash(*h)))
 			.map(|b| BlockView::new(&b).transactions_count())
 			.sum();

parity/main.rs

@@ -54,6 +54,7 @@ extern crate ansi_term;
 extern crate regex;
 extern crate isatty;
 extern crate toml;
+extern crate app_dirs;
 
 #[macro_use]
 extern crate ethcore_util as util;

parity/params.rs

@@ -76,6 +76,14 @@ impl SpecType {
 			}
 		}
 	}
+
+	pub fn legacy_fork_name(&self) -> Option<String> {
+		match *self {
+			SpecType::Classic => Some("classic".to_owned()),
+			SpecType::Expanse => Some("expanse".to_owned()),
+			_ => None,
+		}
+	}
 }
 
 #[derive(Debug, PartialEq)]

parity/presale.rs

@@ -18,11 +18,13 @@ use ethcore::ethstore::{PresaleWallet, EthStore};
 use ethcore::ethstore::dir::DiskDirectory;
 use ethcore::account_provider::AccountProvider;
 use helpers::{password_prompt, password_from_file};
+use params::SpecType;
 
 #[derive(Debug, PartialEq)]
 pub struct ImportWallet {
 	pub iterations: u32,
 	pub path: String,
+	pub spec: SpecType,
 	pub wallet_path: String,
 	pub password_file: Option<String>,
 }

parity/rpc.rs

@@ -23,6 +23,7 @@ use ethcore_rpc::{RpcServerError, RpcServer as Server, IpcServerError};
 use rpc_apis;
 use rpc_apis::ApiSet;
 use helpers::parity_ipc_path;
+use dir::default_data_path;
 
 pub use ethcore_rpc::{IpcServer, Server as HttpServer};
 
@@ -58,9 +59,10 @@ pub struct IpcConfiguration {
 
 impl Default for IpcConfiguration {
 	fn default() -> Self {
+		let data_dir = default_data_path();
 		IpcConfiguration {
 			enabled: true,
-			socket_addr: parity_ipc_path("$HOME/.parity/jsonrpc.ipc"),
+			socket_addr: parity_ipc_path(&data_dir, "$DATA/jsonrpc.ipc"),
 			apis: ApiSet::IpcContext,
 		}
 	}

parity/run.rs

@@ -41,6 +41,7 @@ use params::{
 	tracing_switch_to_bool, fatdb_switch_to_bool, mode_switch_to_bool
 };
 use helpers::{to_client_config, execute_upgrades, passwords_from_files};
+use upgrade::upgrade_key_location;
 use dir::Directories;
 use cache::CacheConfig;
 use user_defaults::UserDefaults;
@@ -129,9 +130,6 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<(), String> {
 	// increase max number of open files
 	raise_fd_limit();
 
-	// create dirs used by parity
-	try!(cmd.dirs.create_dirs(cmd.dapps_conf.enabled, cmd.signer_conf.enabled));
-
 	// load spec
 	let spec = try!(cmd.spec.spec());
 
@@ -139,7 +137,7 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<(), String> {
 	let genesis_hash = spec.genesis_header().hash();
 
 	// database paths
-	let db_dirs = cmd.dirs.database(genesis_hash, spec.fork_name.clone());
+	let db_dirs = cmd.dirs.database(genesis_hash, cmd.spec.legacy_fork_name(), spec.data_dir.clone());
 
 	// user defaults path
 	let user_defaults_path = db_dirs.user_defaults_path();
@@ -166,7 +164,10 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<(), String> {
 	let snapshot_path = db_dirs.snapshot_path();
 
 	// execute upgrades
-	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile(db_dirs.fork_path().as_path())));
+	try!(execute_upgrades(&db_dirs, algorithm, cmd.compaction.compaction_profile(db_dirs.db_root_path().as_path())));
+
+	// create dirs used by parity
+	try!(cmd.dirs.create_dirs(cmd.dapps_conf.enabled, cmd.signer_conf.enabled));
 
 	// run in daemon mode
 	if let Some(pid_file) = cmd.daemon {
@@ -175,7 +176,7 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<(), String> {
 
 	// display info about used pruning algorithm
 	info!("Starting {}", Colour::White.bold().paint(version()));
-	info!("State DB configuation: {}{}{}",
+	info!("State DB configuration: {}{}{}",
 		Colour::White.bold().paint(algorithm.as_str()),
 		match fat_db {
 			true => Colour::White.bold().paint(" +Fat").to_string(),
@@ -217,7 +218,7 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<(), String> {
 	let passwords = try!(passwords_from_files(&cmd.acc_conf.password_files));
 
 	// prepare account provider
-	let account_provider = Arc::new(try!(prepare_account_provider(&cmd.dirs, cmd.acc_conf, &passwords)));
+	let account_provider = Arc::new(try!(prepare_account_provider(&cmd.dirs, &spec.data_dir, cmd.acc_conf, &passwords)));
 
 	// let the Engine access the accounts
 	spec.engine.register_account_provider(account_provider.clone());
@@ -449,11 +450,13 @@ fn daemonize(_pid_file: String) -> Result<(), String> {
 	Err("daemon is no supported on windows".into())
 }
 
-fn prepare_account_provider(dirs: &Directories, cfg: AccountsConfig, passwords: &[String]) -> Result<AccountProvider, String> {
+fn prepare_account_provider(dirs: &Directories, data_dir: &str, cfg: AccountsConfig, passwords: &[String]) -> Result<AccountProvider, String> {
 	use ethcore::ethstore::EthStore;
 	use ethcore::ethstore::dir::DiskDirectory;
 
-	let dir = Box::new(try!(DiskDirectory::create(dirs.keys.clone()).map_err(|e| format!("Could not open keys directory: {}", e))));
+	let path = dirs.keys_path(data_dir);
+	upgrade_key_location(&dirs.legacy_keys_path(cfg.testnet), &path);
+	let dir = Box::new(try!(DiskDirectory::create(&path).map_err(|e| format!("Could not open keys directory: {}", e))));
 	let account_service = AccountProvider::new(Box::new(
 		try!(EthStore::open_with_iterations(dir, cfg.iterations).map_err(|e| format!("Could not open keys directory: {}", e)))
 	));

parity/signer.rs

@@ -23,6 +23,7 @@ use util::path::restrict_permissions_owner;
 use rpc_apis;
 use ethcore_signer as signer;
 use helpers::replace_home;
+use dir::default_data_path;
 pub use ethcore_signer::Server as SignerServer;
 
 const CODES_FILENAME: &'static str = "authcodes";
@@ -38,11 +39,12 @@ pub struct Configuration {
 
 impl Default for Configuration {
 	fn default() -> Self {
+		let data_dir = default_data_path();
 		Configuration {
 			enabled: true,
 			port: 8180,
 			interface: "127.0.0.1".into(),
-			signer_path: replace_home("$HOME/.parity/signer"),
+			signer_path: replace_home(&data_dir, "$DATA/signer"),
 			skip_origin_validation: false,
 		}
 	}

parity/snapshot.rs

@@ -143,7 +143,7 @@ impl SnapshotCommand {
 		let genesis_hash = spec.genesis_header().hash();
 
 		// database paths
-		let db_dirs = self.dirs.database(genesis_hash, spec.fork_name.clone());
+		let db_dirs = self.dirs.database(genesis_hash, None, spec.data_dir.clone());
 
 		// user defaults path
 		let user_defaults_path = db_dirs.user_defaults_path();
@@ -167,7 +167,7 @@ impl SnapshotCommand {
 		let snapshot_path = db_dirs.snapshot_path();
 
 		// execute upgrades
-		try!(execute_upgrades(&db_dirs, algorithm, self.compaction.compaction_profile(db_dirs.fork_path().as_path())));
+		try!(execute_upgrades(&db_dirs, algorithm, self.compaction.compaction_profile(db_dirs.db_root_path().as_path())));
 
 		// prepare client config
 		let client_config = to_client_config(&self.cache_config, Mode::Active, tracing, fat_db, self.compaction, self.wal, VMType::default(), "".into(), algorithm, self.pruning_history, true);

parity/upgrade.rs

@@ -18,10 +18,14 @@
 
 use semver::Version;
 use std::collections::*;
-use std::fs::{File, create_dir_all};
+use std::fs::{self, File, create_dir_all};
 use std::env;
+use std::io;
 use std::io::{Read, Write};
-use std::path::PathBuf;
+use std::path::{PathBuf, Path};
+use dir::{DatabaseDirectories, default_data_path};
+use helpers::replace_home;
+use util::journaldb::Algorithm;
 
 #[cfg_attr(feature="dev", allow(enum_variant_names))]
 #[derive(Debug)]
@@ -126,3 +130,84 @@ pub fn upgrade(db_path: Option<&str>) -> Result<usize, Error> {
 		upgrade_from_version(ver)
 	})
 }
+
+fn file_exists(path: &Path) -> bool {
+	match fs::metadata(&path) {
+		Err(ref e) if e.kind() == io::ErrorKind::NotFound => false,
+		_ => true,
+	}
+}
+
+pub fn upgrade_key_location(from: &PathBuf, to: &PathBuf) {
+	let mut parent = to.clone();
+	parent.pop();
+	match fs::create_dir_all(&parent).and_then(|()| fs::read_dir(from)) {
+		Ok(entries) => {
+			let files: Vec<_> = entries.filter_map(|f| f.ok().and_then(|f| if f.file_type().ok().map_or(false, |f| f.is_file()) { f.file_name().to_str().map(|s| s.to_owned()) } else { None })).collect();
+			let mut num: usize = 0;
+			for name in files {
+				let mut from = from.clone();
+				from.push(&name);
+				let mut to = to.clone();
+				to.push(&name);
+				if !file_exists(&to) {
+					if let Err(e) = fs::rename(&from, &to) {
+						debug!("Error upgrading key {:?}: {:?}", from, e);
+					} else {
+						num += 1;
+					}
+				} else {
+					debug!("Skipped upgrading key {:?}", from);
+				}
+			}
+			if num > 0 {
+				info!("Moved {} keys from {} to {}", num, from.to_string_lossy(), to.to_string_lossy());
+			}
+		},
+		Err(e) => {
+			warn!("Error moving keys from {:?} to {:?}: {:?}", from, to, e);
+		}
+	}
+}
+
+fn upgrade_dir_location(source: &PathBuf, dest: &PathBuf) {
+	if file_exists(&source) {
+		if !file_exists(&dest) {
+			let mut parent = dest.clone();
+			parent.pop();
+			if let Err(e) = fs::create_dir_all(&parent).and_then(|()| fs::rename(&source, &dest)) {
+				debug!("Skipped path {:?} -> {:?} :{:?}", source, dest, e);
+			} else {
+				info!("Moved {} to {}", source.to_string_lossy(), dest.to_string_lossy());
+			}
+		} else {
+			debug!("Skipped upgrading directory {:?}, Destination already exists at {:?}", source, dest);
+		}
+	}
+}
+
+fn upgrade_user_defaults(dirs: &DatabaseDirectories) {
+	let source = dirs.legacy_user_defaults_path();
+	let dest = dirs.user_defaults_path();
+	if file_exists(&source) {
+		if !file_exists(&dest) {
+			if let Err(e) = fs::rename(&source, &dest) {
+				debug!("Skipped upgrading user defaults {:?}:{:?}", dest, e);
+			}
+		} else {
+			debug!("Skipped upgrading user defaults {:?}, File exists at {:?}", source, dest);
+		}
+	}
+}
+
+pub fn upgrade_data_paths(dirs: &DatabaseDirectories, pruning: Algorithm) {
+	let legacy_root_path = replace_home("", "$HOME/.parity");
+	let default_path = default_data_path();
+	if legacy_root_path != dirs.path && dirs.path == default_path {
+		upgrade_dir_location(&PathBuf::from(legacy_root_path), &PathBuf::from(&dirs.path));
+	}
+	upgrade_dir_location(&dirs.legacy_version_path(pruning), &dirs.db_path(pruning));
+	upgrade_dir_location(&dirs.legacy_snapshot_path(), &dirs.snapshot_path());
+	upgrade_dir_location(&dirs.legacy_network_path(), &dirs.network_path());
+	upgrade_user_defaults(&dirs);
+}

rpc/src/v1/helpers/dispatch.rs

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::fmt::Debug;
+use std::ops::Deref;
 use rlp;
 use util::{Address, H256, U256, Uint, Bytes};
 use util::bytes::ToPretty;
@@ -37,46 +39,112 @@ use v1::types::{
 
 pub const DEFAULT_MAC: [u8; 2] = [0, 0];
 
-pub fn execute<C, M>(client: &C, miner: &M, accounts: &AccountProvider, payload: ConfirmationPayload, pass: Option<String>) -> Result<ConfirmationResponse, Error>
+type AccountToken = String;
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum SignWith {
+	Nothing,
+	Password(String),
+	Token(AccountToken),
+}
+
+#[derive(Debug)]
+pub enum WithToken<T: Debug> {
+	No(T),
+	Yes(T, AccountToken),
+}
+
+impl<T: Debug> Deref for WithToken<T> {
+	type Target = T;
+
+	fn deref(&self) -> &Self::Target {
+		match *self {
+			WithToken::No(ref v) => v,
+			WithToken::Yes(ref v, _) => v,
+		}
+	}
+}
+
+impl<T: Debug> WithToken<T> {
+	pub fn map<S, F>(self, f: F) -> WithToken<S> where
+		S: Debug,
+		F: FnOnce(T) -> S,
+	{
+		match self {
+			WithToken::No(v) => WithToken::No(f(v)),
+			WithToken::Yes(v, token) => WithToken::Yes(f(v), token),
+		}
+	}
+
+	pub fn into_value(self) -> T {
+		match self {
+			WithToken::No(v) => v,
+			WithToken::Yes(v, _) => v,
+		}
+	}
+}
+
+impl<T: Debug> From<(T, AccountToken)> for WithToken<T> {
+	fn from(tuple: (T, AccountToken)) -> Self {
+		WithToken::Yes(tuple.0, tuple.1)
+	}
+}
+
+pub fn execute<C, M>(client: &C, miner: &M, accounts: &AccountProvider, payload: ConfirmationPayload, pass: SignWith) -> Result<WithToken<ConfirmationResponse>, Error>
 	where C: MiningBlockChainClient, M: MinerService
 {
 	match payload {
 		ConfirmationPayload::SendTransaction(request) => {
 			sign_and_dispatch(client, miner, accounts, request, pass)
-				.map(RpcH256::from)
+				.map(|result| result
-				.map(ConfirmationResponse::SendTransaction)
+					.map(RpcH256::from)
+					.map(ConfirmationResponse::SendTransaction)
+				)
 		},
 		ConfirmationPayload::SignTransaction(request) => {
 			sign_no_dispatch(client, miner, accounts, request, pass)
-				.map(RpcRichRawTransaction::from)
+				.map(|result| result
-				.map(ConfirmationResponse::SignTransaction)
+					.map(RpcRichRawTransaction::from)
+					.map(ConfirmationResponse::SignTransaction)
+				)
 		},
 		ConfirmationPayload::Signature(address, hash) => {
 			signature(accounts, address, hash, pass)
-				.map(RpcH520::from)
+				.map(|result| result
-				.map(ConfirmationResponse::Signature)
+					.map(RpcH520::from)
+					.map(ConfirmationResponse::Signature)
+				)
 		},
 		ConfirmationPayload::Decrypt(address, data) => {
 			decrypt(accounts, address, data, pass)
-				.map(RpcBytes)
+				.map(|result| result
-				.map(ConfirmationResponse::Decrypt)
+					.map(RpcBytes)
+					.map(ConfirmationResponse::Decrypt)
+				)
 		},
 	}
 }
 
-fn signature(accounts: &AccountProvider, address: Address, hash: H256, password: Option<String>) -> Result<Signature, Error> {
+fn signature(accounts: &AccountProvider, address: Address, hash: H256, password: SignWith) -> Result<WithToken<Signature>, Error> {
-	accounts.sign(address, password.clone(), hash).map_err(|e| match password {
+	match password.clone() {
-		Some(_) => errors::from_password_error(e),
+		SignWith::Nothing => accounts.sign(address, None, hash).map(WithToken::No),
-		None => errors::from_signing_error(e),
+		SignWith::Password(pass) => accounts.sign(address, Some(pass), hash).map(WithToken::No),
+		SignWith::Token(token) => accounts.sign_with_token(address, token, hash).map(Into::into),
+	}.map_err(|e| match password {
+		SignWith::Nothing => errors::from_signing_error(e),
+		_ => errors::from_password_error(e),
 	})
 }
 
-fn decrypt(accounts: &AccountProvider, address: Address, msg: Bytes, password: Option<String>) -> Result<Bytes, Error> {
+fn decrypt(accounts: &AccountProvider, address: Address, msg: Bytes, password: SignWith) -> Result<WithToken<Bytes>, Error> {
-	accounts.decrypt(address, password.clone(), &DEFAULT_MAC, &msg)
+	match password.clone() {
-		.map_err(|e| match password {
+		SignWith::Nothing => accounts.decrypt(address, None, &DEFAULT_MAC, &msg).map(WithToken::No),
-			Some(_) => errors::from_password_error(e),
+		SignWith::Password(pass) => accounts.decrypt(address, Some(pass), &DEFAULT_MAC, &msg).map(WithToken::No),
-			None => errors::from_signing_error(e),
+		SignWith::Token(token) => accounts.decrypt_with_token(address, token, &DEFAULT_MAC, &msg).map(Into::into),
-		})
+	}.map_err(|e| match password {
+		SignWith::Nothing => errors::from_signing_error(e),
+		_ => errors::from_password_error(e),
+	})
 }
 
 pub fn dispatch_transaction<C, M>(client: &C, miner: &M, signed_transaction: SignedTransaction) -> Result<H256, Error>
@@ -88,7 +156,7 @@ pub fn dispatch_transaction<C, M>(client: &C, miner: &M, signed_transaction: Sig
 		.map(|_| hash)
 }
 
-pub fn sign_no_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: Option<String>) -> Result<SignedTransaction, Error>
+pub fn sign_no_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: SignWith) -> Result<WithToken<SignedTransaction>, Error>
 	where C: MiningBlockChainClient, M: MinerService {
 
 	let network_id = client.signing_network_id();
@@ -110,20 +178,32 @@ pub fn sign_no_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider,
 
 		let hash = t.hash(network_id);
 		let signature = try!(signature(accounts, address, hash, password));
-		t.with_signature(signature, network_id)
+		signature.map(|sig| {
+			t.with_signature(sig, network_id)
+		})
 	};
 	Ok(signed_transaction)
 }
 
-pub fn sign_and_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: Option<String>) -> Result<H256, Error>
+pub fn sign_and_dispatch<C, M>(client: &C, miner: &M, accounts: &AccountProvider, filled: FilledTransactionRequest, password: SignWith) -> Result<WithToken<H256>, Error>
 	where C: MiningBlockChainClient, M: MinerService
 {
 
 	let network_id = client.signing_network_id();
 	let signed_transaction = try!(sign_no_dispatch(client, miner, accounts, filled, password));
 
+	let (signed_transaction, token) = match signed_transaction {
+		WithToken::No(signed_transaction) => (signed_transaction, None),
+		WithToken::Yes(signed_transaction, token) => (signed_transaction, Some(token)),
+	};
+
 	trace!(target: "miner", "send_transaction: dispatching tx: {} for network ID {:?}", rlp::encode(&signed_transaction).to_vec().pretty(), network_id);
-	dispatch_transaction(&*client, &*miner, signed_transaction)
+	dispatch_transaction(&*client, &*miner, signed_transaction).map(|hash| {
+		match token {
+			Some(ref token) => WithToken::Yes(hash, token.clone()),
+			None => WithToken::No(hash),
+		}
+	})
 }
 
 pub fn fill_optional_fields<C, M>(request: TransactionRequest, client: &C, miner: &M) -> FilledTransactionRequest

rpc/src/v1/impls/personal.rs

@@ -114,7 +114,7 @@ impl<C: 'static, M: 'static> Personal for PersonalClient<C, M> where C: MiningBl
 			&*miner,
 			&*accounts,
 			request,
-			Some(password)
+			dispatch::SignWith::Password(password)
-		).map(Into::into)
+		).map(|v| v.into_value().into())
 	}
 }

rpc/src/v1/impls/signer.rs

@@ -26,9 +26,9 @@ use ethcore::miner::MinerService;
 
 use jsonrpc_core::Error;
 use v1::traits::Signer;
-use v1::types::{TransactionModification, ConfirmationRequest, ConfirmationResponse, U256, Bytes};
+use v1::types::{TransactionModification, ConfirmationRequest, ConfirmationResponse, ConfirmationResponseWithToken, U256, Bytes};
 use v1::helpers::{errors, SignerService, SigningQueue, ConfirmationPayload};
-use v1::helpers::dispatch::{self, dispatch_transaction};
+use v1::helpers::dispatch::{self, dispatch_transaction, WithToken};
 
 /// Transactions confirmation (personal) rpc implementation.
 pub struct SignerClient<C, M> where C: MiningBlockChainClient, M: MinerService {
@@ -60,24 +60,10 @@ impl<C: 'static, M: 'static> SignerClient<C, M> where C: MiningBlockChainClient,
 		take_weak!(self.client).keep_alive();
 		Ok(())
 	}
-}
 
-impl<C: 'static, M: 'static> Signer for SignerClient<C, M> where C: MiningBlockChainClient, M: MinerService {
+	fn confirm_internal<F>(&self, id: U256, modification: TransactionModification, f: F) -> Result<WithToken<ConfirmationResponse>, Error> where
-
+		F: FnOnce(&C, &M, &AccountProvider, ConfirmationPayload) -> Result<WithToken<ConfirmationResponse>, Error>,
-	fn requests_to_confirm(&self) -> Result<Vec<ConfirmationRequest>, Error> {
+	{
-		try!(self.active());
-		let signer = take_weak!(self.signer);
-
-		Ok(signer.requests()
-			.into_iter()
-			.map(Into::into)
-			.collect()
-		)
-	}
-
-	// TODO [ToDr] TransactionModification is redundant for some calls
-	// might be better to replace it in future
-	fn confirm_request(&self, id: U256, modification: TransactionModification, pass: String) -> Result<ConfirmationResponse, Error> {
 		try!(self.active());
 
 		let id = id.into();
@@ -97,14 +83,48 @@ impl<C: 'static, M: 'static> Signer for SignerClient<C, M> where C: MiningBlockC
 					request.gas = gas.into();
 				}
 			}
+			let result = f(&*client, &*miner, &*accounts, payload);
 			// Execute
-			let result = dispatch::execute(&*client, &*miner, &*accounts, payload, Some(pass));
 			if let Ok(ref response) = result {
-				signer.request_confirmed(id, Ok(response.clone()));
+				signer.request_confirmed(id, Ok((*response).clone()));
 			}
 			result
 		}).unwrap_or_else(|| Err(errors::invalid_params("Unknown RequestID", id)))
 	}
+}
+
+impl<C: 'static, M: 'static> Signer for SignerClient<C, M> where C: MiningBlockChainClient, M: MinerService {
+
+	fn requests_to_confirm(&self) -> Result<Vec<ConfirmationRequest>, Error> {
+		try!(self.active());
+		let signer = take_weak!(self.signer);
+
+		Ok(signer.requests()
+			.into_iter()
+			.map(Into::into)
+			.collect()
+		)
+	}
+
+	// TODO [ToDr] TransactionModification is redundant for some calls
+	// might be better to replace it in future
+	fn confirm_request(&self, id: U256, modification: TransactionModification, pass: String) -> Result<ConfirmationResponse, Error> {
+		self.confirm_internal(id, modification, move |client, miner, accounts, payload| {
+			dispatch::execute(client, miner, accounts, payload, dispatch::SignWith::Password(pass))
+		}).map(|v| v.into_value())
+	}
+
+	fn confirm_request_with_token(&self, id: U256, modification: TransactionModification, token: String) -> Result<ConfirmationResponseWithToken, Error> {
+		self.confirm_internal(id, modification, move |client, miner, accounts, payload| {
+			dispatch::execute(client, miner, accounts, payload, dispatch::SignWith::Token(token))
+		}).and_then(|v| match v {
+			WithToken::No(_) => Err(errors::internal("Unexpected response without token.", "")),
+			WithToken::Yes(response, token) => Ok(ConfirmationResponseWithToken {
+				result: response,
+				token: token,
+			}),
+		})
+	}
 
 	fn confirm_request_raw(&self, id: U256, bytes: Bytes) -> Result<ConfirmationResponse, Error> {
 		try!(self.active());

rpc/src/v1/impls/signing.rs

@@ -99,7 +99,9 @@ impl<C, M> SigningQueueClient<C, M> where
 
 		let sender = payload.sender();
 		if accounts.is_unlocked(sender) {
-			return dispatch::execute(&*client, &*miner, &*accounts, payload, None).map(DispatchResult::Value);
+			return dispatch::execute(&*client, &*miner, &*accounts, payload, dispatch::SignWith::Nothing)
+				.map(|v| v.into_value())
+				.map(DispatchResult::Value);
 		}
 
 		take_weak!(self.signer).add_request(payload)

rpc/src/v1/impls/signing_unsafe.rs

@@ -76,7 +76,8 @@ impl<C, M> SigningUnsafeClient<C, M> where
 		let accounts = take_weak!(self.accounts);
 
 		let payload = dispatch::from_rpc(payload, &*client, &*miner);
-		dispatch::execute(&*client, &*miner, &*accounts, payload, None)
+		dispatch::execute(&*client, &*miner, &*accounts, payload, dispatch::SignWith::Nothing)
+			.map(|v| v.into_value())
 	}
 }
 

rpc/src/v1/tests/mocked/signer.rs

@@ -209,6 +209,53 @@ fn should_confirm_transaction_and_dispatch() {
 	assert_eq!(tester.miner.imported_transactions.lock().len(), 1);
 }
 
+#[test]
+fn should_confirm_transaction_with_token() {
+	// given
+	let tester = signer_tester();
+	let address = tester.accounts.new_account("test").unwrap();
+	let recipient = Address::from_str("d46e8dd67c5d32be8058bb8eb970870f07244567").unwrap();
+	tester.signer.add_request(ConfirmationPayload::SendTransaction(FilledTransactionRequest {
+		from: address,
+		to: Some(recipient),
+		gas_price: U256::from(10_000),
+		gas: U256::from(10_000_000),
+		value: U256::from(1),
+		data: vec![],
+		nonce: None,
+	})).unwrap();
+
+	let t = Transaction {
+		nonce: U256::zero(),
+		gas_price: U256::from(0x1000),
+		gas: U256::from(10_000_000),
+		action: Action::Call(recipient),
+		value: U256::from(0x1),
+		data: vec![]
+	};
+	let (signature, token) = tester.accounts.sign_with_token(address, "test".into(), t.hash(None)).unwrap();
+	let t = t.with_signature(signature, None);
+
+	assert_eq!(tester.signer.requests().len(), 1);
+
+	// when
+	let request = r#"{
+		"jsonrpc":"2.0",
+		"method":"signer_confirmRequestWithToken",
+		"params":["0x1", {"gasPrice":"0x1000"}, ""#.to_owned() + &token + r#""],
+		"id":1
+	}"#;
+	let response = r#"{"jsonrpc":"2.0","result":{"result":""#.to_owned() +
+		format!("0x{:?}", t.hash()).as_ref() +
+		r#"","token":""#;
+
+	// then
+	let result = tester.io.handle_request_sync(&request).unwrap();
+	assert!(result.starts_with(&response), "Should return correct result. Expected: {:?}, Got: {:?}", response, result);
+	assert_eq!(tester.signer.requests().len(), 0);
+	assert_eq!(tester.miner.imported_transactions.lock().len(), 1);
+}
+
 #[test]
 fn should_confirm_transaction_with_rlp() {
 	// given

rpc/src/v1/traits/signer.rs

@@ -17,7 +17,7 @@
 //! Parity Signer-related rpc interface.
 use jsonrpc_core::Error;
 
-use v1::types::{U256, Bytes, TransactionModification, ConfirmationRequest, ConfirmationResponse};
+use v1::types::{U256, Bytes, TransactionModification, ConfirmationRequest, ConfirmationResponse, ConfirmationResponseWithToken};
 
 build_rpc_trait! {
 	/// Signer extension for confirmations rpc interface.
@@ -31,6 +31,10 @@ build_rpc_trait! {
 		#[rpc(name = "signer_confirmRequest")]
 		fn confirm_request(&self, U256, TransactionModification, String) -> Result<ConfirmationResponse, Error>;
 
+		/// Confirm specific request with token.
+		#[rpc(name = "signer_confirmRequestWithToken")]
+		fn confirm_request_with_token(&self, U256, TransactionModification, String) -> Result<ConfirmationResponseWithToken, Error>;
+
 		/// Confirm specific request with already signed data.
 		#[rpc(name = "signer_confirmRequestRaw")]
 		fn confirm_request_raw(&self, U256, Bytes) -> Result<ConfirmationResponse, Error>;

rpc/src/v1/types/confirmations.rs

@@ -141,6 +141,15 @@ impl Serialize for ConfirmationResponse {
 	}
 }
 
+/// Confirmation response with additional token for further requests
+#[derive(Debug, Clone, PartialEq, Serialize)]
+pub struct ConfirmationResponseWithToken {
+	/// Actual response
+	pub result: ConfirmationResponse,
+	/// New token
+	pub token: String,
+}
+
 /// Confirmation payload, i.e. the thing to be confirmed
 #[derive(Debug, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
 pub enum ConfirmationPayload {
@@ -225,7 +234,7 @@ impl<A, B> Serialize for Either<A, B>  where
 mod tests {
 	use std::str::FromStr;
 	use serde_json;
-	use v1::types::U256;
+	use v1::types::{U256, H256};
 	use v1::helpers;
 	use super::*;
 
@@ -339,4 +348,20 @@ mod tests {
 			gas: None,
 		});
 	}
+
+	#[test]
+	fn should_serialize_confirmation_response_with_token() {
+		// given
+		let response = ConfirmationResponseWithToken {
+			result: ConfirmationResponse::SendTransaction(H256::default()),
+			token: "test-token".into(),
+		};
+
+		// when
+		let res = serde_json::to_string(&response);
+		let expected = r#"{"result":"0x0000000000000000000000000000000000000000000000000000000000000000","token":"test-token"}"#;
+
+		// then
+		assert_eq!(res.unwrap(), expected.to_owned());
+	}
 }

rpc/src/v1/types/mod.rs.in

@@ -39,7 +39,10 @@ pub use self::bytes::Bytes;
 pub use self::block::{RichBlock, Block, BlockTransactions};
 pub use self::block_number::BlockNumber;
 pub use self::call_request::CallRequest;
-pub use self::confirmations::{ConfirmationPayload, ConfirmationRequest, ConfirmationResponse, TransactionModification, SignRequest, DecryptRequest, Either};
+pub use self::confirmations::{
+	ConfirmationPayload, ConfirmationRequest, ConfirmationResponse, ConfirmationResponseWithToken,
+	TransactionModification, SignRequest, DecryptRequest, Either
+};
 pub use self::dapp_id::DappId;
 pub use self::filter::{Filter, FilterChanges};
 pub use self::hash::{H64, H160, H256, H512, H520, H2048};

sync/src/api.rs

@@ -35,7 +35,12 @@ use parking_lot::RwLock;
 use chain::{ETH_PACKET_COUNT, SNAPSHOT_SYNC_PACKET_COUNT};
 use light::net::{LightProtocol, Params as LightParams, Capabilities, Handler as LightHandler, EventContext};
 
+/// Parity sync protocol
 pub const WARP_SYNC_PROTOCOL_ID: ProtocolId = *b"par";
+/// Ethereum sync protocol
+pub const ETH_PROTOCOL: ProtocolId = *b"eth";
+/// Ethereum light protocol
+pub const LES_PROTOCOL: ProtocolId = *b"les";
 
 /// Sync configuration
 #[derive(Debug, Clone, Copy)]
@@ -64,8 +69,8 @@ impl Default for SyncConfig {
 			max_download_ahead_blocks: 20000,
 			download_old_blocks: true,
 			network_id: 1,
-			subprotocol_name: *b"eth",
+			subprotocol_name: ETH_PROTOCOL,
-			light_subprotocol_name: *b"les",
+			light_subprotocol_name: LES_PROTOCOL,
 			fork_block: None,
 			warp_sync: false,
 			serve_light: false,
@@ -143,7 +148,7 @@ pub struct EthSync {
 	/// Network service
 	network: NetworkService,
 	/// Main (eth/par) protocol handler
-	sync_handler: Arc<SyncProtocolHandler>,
+	eth_handler: Arc<SyncProtocolHandler>,
 	/// Light (les) protocol handler
 	light_proto: Option<Arc<LightProtocol>>,
 	/// The main subprotocol name
@@ -182,7 +187,7 @@ impl EthSync {
 
 		let sync = Arc::new(EthSync {
 			network: service,
-			sync_handler: Arc::new(SyncProtocolHandler {
+			eth_handler: Arc::new(SyncProtocolHandler {
 				sync: RwLock::new(chain_sync),
 				chain: params.chain,
 				snapshot_service: params.snapshot_service,
@@ -201,15 +206,15 @@ impl EthSync {
 impl SyncProvider for EthSync {
 	/// Get sync status
 	fn status(&self) -> SyncStatus {
-		self.sync_handler.sync.write().status()
+		self.eth_handler.sync.write().status()
 	}
 
 	/// Get sync peers
 	fn peers(&self) -> Vec<PeerInfo> {
 		// TODO: [rob] LES peers/peer info
 		self.network.with_context_eval(self.subprotocol_name, |context| {
-			let sync_io = NetSyncIo::new(context, &*self.sync_handler.chain, &*self.sync_handler.snapshot_service, &self.sync_handler.overlay);
+			let sync_io = NetSyncIo::new(context, &*self.eth_handler.chain, &*self.eth_handler.snapshot_service, &self.eth_handler.overlay);
-			self.sync_handler.sync.write().peers(&sync_io)
+			self.eth_handler.sync.write().peers(&sync_io)
 		}).unwrap_or(Vec::new())
 	}
 
@@ -218,7 +223,7 @@ impl SyncProvider for EthSync {
 	}
 
 	fn transactions_stats(&self) -> BTreeMap<H256, TransactionStats> {
-		let sync = self.sync_handler.sync.read();
+		let sync = self.eth_handler.sync.read();
 		sync.transactions_stats()
 			.iter()
 			.map(|(hash, stats)| (*hash, stats.into()))
@@ -277,19 +282,21 @@ impl ChainNotify for EthSync {
 		enacted: Vec<H256>,
 		retracted: Vec<H256>,
 		sealed: Vec<H256>,
+		proposed: Vec<Bytes>,
 		_duration: u64)
 	{
 		use light::net::Announcement;
 
 		self.network.with_context(self.subprotocol_name, |context| {
-			let mut sync_io = NetSyncIo::new(context, &*self.sync_handler.chain, &*self.sync_handler.snapshot_service, &self.sync_handler.overlay);
+			let mut sync_io = NetSyncIo::new(context, &*self.eth_handler.chain, &*self.eth_handler.snapshot_service, &self.eth_handler.overlay);
-			self.sync_handler.sync.write().chain_new_blocks(
+			self.eth_handler.sync.write().chain_new_blocks(
 				&mut sync_io,
 				&imported,
 				&invalid,
 				&enacted,
 				&retracted,
-				&sealed);
+				&sealed,
+				&proposed);
 		});
 
 		self.network.with_context(self.light_subprotocol_name, |context| {
@@ -297,8 +304,8 @@ impl ChainNotify for EthSync {
 				Some(lp) => lp,
 				None => return,
 			};
-
+			
-			let chain_info = self.sync_handler.chain.chain_info();
+			let chain_info = self.eth_handler.chain.chain_info();
 			light_proto.make_announcement(context, Announcement {
 				head_hash: chain_info.best_block_hash,
 				head_num: chain_info.best_block_number,
@@ -318,10 +325,10 @@ impl ChainNotify for EthSync {
 			Err(err) => warn!("Error starting network: {}", err),
 			_ => {},
 		}
-		self.network.register_protocol(self.sync_handler.clone(), self.subprotocol_name, ETH_PACKET_COUNT, &[62u8, 63u8])
+		self.network.register_protocol(self.eth_handler.clone(), self.subprotocol_name, ETH_PACKET_COUNT, &[62u8, 63u8])
 			.unwrap_or_else(|e| warn!("Error registering ethereum protocol: {:?}", e));
 		// register the warp sync subprotocol
-		self.network.register_protocol(self.sync_handler.clone(), WARP_SYNC_PROTOCOL_ID, SNAPSHOT_SYNC_PACKET_COUNT, &[1u8])
+		self.network.register_protocol(self.eth_handler.clone(), WARP_SYNC_PROTOCOL_ID, SNAPSHOT_SYNC_PACKET_COUNT, &[1u8, 2u8])
 			.unwrap_or_else(|e| warn!("Error registering snapshot sync protocol: {:?}", e));
 
 		// register the light protocol.
@@ -332,12 +339,19 @@ impl ChainNotify for EthSync {
 	}
 
 	fn stop(&self) {
-		self.sync_handler.snapshot_service.abort_restore();
+		self.eth_handler.snapshot_service.abort_restore();
 		self.network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
 	}
 
+	fn broadcast(&self, message: Vec<u8>) {
+		self.network.with_context(WARP_SYNC_PROTOCOL_ID, |context| {
+			let mut sync_io = NetSyncIo::new(context, &*self.eth_handler.chain, &*self.eth_handler.snapshot_service, &self.eth_handler.overlay);
+			self.eth_handler.sync.write().propagate_consensus_packet(&mut sync_io, message.clone());
+		});
+	}
+
 	fn transactions_received(&self, hashes: Vec<H256>, peer_id: PeerId) {
-		let mut sync = self.sync_handler.sync.write();
+		let mut sync = self.eth_handler.sync.write();
 		sync.transactions_received(hashes, peer_id);
 	}
 }
@@ -399,8 +413,8 @@ impl ManageNetwork for EthSync {
 
 	fn stop_network(&self) {
 		self.network.with_context(self.subprotocol_name, |context| {
-			let mut sync_io = NetSyncIo::new(context, &*self.sync_handler.chain, &*self.sync_handler.snapshot_service, &self.sync_handler.overlay);
+			let mut sync_io = NetSyncIo::new(context, &*self.eth_handler.chain, &*self.eth_handler.snapshot_service, &self.eth_handler.overlay);
-			self.sync_handler.sync.write().abort(&mut sync_io);
+			self.eth_handler.sync.write().abort(&mut sync_io);
 		});
 
 		if let Some(light_proto) = self.light_proto.as_ref() {

sync/src/chain.rs

@@ -113,6 +113,7 @@ type PacketDecodeError = DecoderError;
 const PROTOCOL_VERSION_63: u8 = 63;
 const PROTOCOL_VERSION_62: u8 = 62;
 const PROTOCOL_VERSION_1: u8 = 1;
+const PROTOCOL_VERSION_2: u8 = 2;
 const MAX_BODIES_TO_SEND: usize = 256;
 const MAX_HEADERS_TO_SEND: usize = 512;
 const MAX_NODE_DATA_TO_SEND: usize = 1024;
@@ -149,8 +150,9 @@ const GET_SNAPSHOT_MANIFEST_PACKET: u8 = 0x11;
 const SNAPSHOT_MANIFEST_PACKET: u8 = 0x12;
 const GET_SNAPSHOT_DATA_PACKET: u8 = 0x13;
 const SNAPSHOT_DATA_PACKET: u8 = 0x14;
+const CONSENSUS_DATA_PACKET: u8 = 0x15;
 
-pub const SNAPSHOT_SYNC_PACKET_COUNT: u8 = 0x15;
+pub const SNAPSHOT_SYNC_PACKET_COUNT: u8 = 0x16;
 
 const MAX_SNAPSHOT_CHUNKS_DOWNLOAD_AHEAD: usize = 3;
 
@@ -615,13 +617,15 @@ impl ChainSync {
 			trace!(target: "sync", "Peer {} network id mismatch (ours: {}, theirs: {})", peer_id, self.network_id, peer.network_id);
 			return Ok(());
 		}
-		if (warp_protocol && peer.protocol_version != PROTOCOL_VERSION_1) || (!warp_protocol && peer.protocol_version != PROTOCOL_VERSION_63 && peer.protocol_version != PROTOCOL_VERSION_62) {
+		if (warp_protocol && peer.protocol_version != PROTOCOL_VERSION_1 && peer.protocol_version != PROTOCOL_VERSION_2) || (!warp_protocol && peer.protocol_version != PROTOCOL_VERSION_63 && peer.protocol_version != PROTOCOL_VERSION_62) {
 			io.disable_peer(peer_id);
 			trace!(target: "sync", "Peer {} unsupported eth protocol ({})", peer_id, peer.protocol_version);
 			return Ok(());
 		}
 
 		self.peers.insert(peer_id.clone(), peer);
+		// Don't activate peer immediatelly when searching for common block.
+		// Let the current sync round complete first.
 		self.active_peers.insert(peer_id.clone());
 		debug!(target: "sync", "Connected {}:{}", peer_id, io.peer_info(peer_id));
 		if let Some((fork_block, _)) = self.fork_block {
@@ -1422,8 +1426,9 @@ impl ChainSync {
 
 	/// Send Status message
 	fn send_status(&mut self, io: &mut SyncIo, peer: PeerId) -> Result<(), NetworkError> {
-		let warp_protocol = io.protocol_version(&WARP_SYNC_PROTOCOL_ID, peer) != 0;
+		let warp_protocol_version = io.protocol_version(&WARP_SYNC_PROTOCOL_ID, peer);
-		let protocol = if warp_protocol { PROTOCOL_VERSION_1 } else { io.eth_protocol_version(peer) };
+		let warp_protocol = warp_protocol_version != 0;
+		let protocol = if warp_protocol { warp_protocol_version } else { PROTOCOL_VERSION_63 };
 		trace!(target: "sync", "Sending status to {}, protocol version {}", peer, protocol);
 		let mut packet = RlpStream::new_list(if warp_protocol { 7 } else { 5 });
 		let chain = io.chain().chain_info();
@@ -1672,7 +1677,7 @@ impl ChainSync {
 			GET_SNAPSHOT_DATA_PACKET => ChainSync::return_rlp(io, &rlp, peer,
 				ChainSync::return_snapshot_data,
 				|e| format!("Error sending snapshot data: {:?}", e)),
-
+			CONSENSUS_DATA_PACKET => ChainSync::on_consensus_packet(io, peer, &rlp),
 			_ => {
 				sync.write().on_packet(io, peer, packet_id, data);
 				Ok(())
@@ -1799,44 +1804,51 @@ impl ChainSync {
 		}
 	}
 
+	/// creates rlp from block bytes and total difficulty
+	fn create_block_rlp(bytes: &Bytes, total_difficulty: U256) -> Bytes {
+		let mut rlp_stream = RlpStream::new_list(2);
+		rlp_stream.append_raw(bytes, 1);
+		rlp_stream.append(&total_difficulty);
+		rlp_stream.out()
+	}
+
 	/// creates latest block rlp for the given client
 	fn create_latest_block_rlp(chain: &BlockChainClient) -> Bytes {
-		let mut rlp_stream = RlpStream::new_list(2);
+		ChainSync::create_block_rlp(
-		rlp_stream.append_raw(&chain.block(BlockId::Hash(chain.chain_info().best_block_hash)).expect("Best block always exists"), 1);
+			&chain.block(BlockId::Hash(chain.chain_info().best_block_hash)).expect("Best block always exists"),
-		rlp_stream.append(&chain.chain_info().total_difficulty);
+			chain.chain_info().total_difficulty
-		rlp_stream.out()
+		)
 	}
 
-	/// creates latest block rlp for the given client
+	/// creates given hash block rlp for the given client
 	fn create_new_block_rlp(chain: &BlockChainClient, hash: &H256) -> Bytes {
-		let mut rlp_stream = RlpStream::new_list(2);
+		ChainSync::create_block_rlp(
-		rlp_stream.append_raw(&chain.block(BlockId::Hash(hash.clone())).expect("Block has just been sealed; qed"), 1);
+			&chain.block(BlockId::Hash(hash.clone())).expect("Block has just been sealed; qed"),
-		rlp_stream.append(&chain.block_total_difficulty(BlockId::Hash(hash.clone())).expect("Block has just been sealed; qed."));
+			chain.block_total_difficulty(BlockId::Hash(hash.clone())).expect("Block has just been sealed; qed.")
-		rlp_stream.out()
+		)
 	}
 
-	/// returns peer ids that have less blocks than our chain
+	/// returns peer ids that have different blocks than our chain
-	fn get_lagging_peers(&mut self, chain_info: &BlockChainInfo, io: &SyncIo) -> Vec<PeerId> {
+	fn get_lagging_peers(&mut self, chain_info: &BlockChainInfo) -> Vec<PeerId> {
 		let latest_hash = chain_info.best_block_hash;
-		self.peers.iter_mut().filter_map(|(&id, ref mut peer_info)|
+		self
-			match io.chain().block_status(BlockId::Hash(peer_info.latest_hash.clone())) {
+			.peers
-				BlockStatus::InChain => {
+			.iter_mut()
-					if peer_info.latest_hash != latest_hash {
+			.filter_map(|(&id, ref mut peer_info)| {
-						Some(id)
+				trace!(target: "sync", "Checking peer our best {} their best {}", latest_hash, peer_info.latest_hash);
-					} else {
+				if peer_info.latest_hash != latest_hash {
-						None
+					Some(id)
-					}
+				} else {
-				},
+					None
-				_ => None
+				}
 			})
 			.collect::<Vec<_>>()
 	}
 
-	fn select_random_lagging_peers(&mut self, peers: &[PeerId]) -> Vec<PeerId> {
+	fn select_random_peers(peers: &[PeerId]) -> Vec<PeerId> {
-		use rand::Rng;
 		// take sqrt(x) peers
 		let mut peers = peers.to_vec();
-		let mut count = (self.peers.len() as f64).powf(0.5).round() as usize;
+		let mut count = (peers.len() as f64).powf(0.5).round() as usize;
 		count = min(count, MAX_PEERS_PROPAGATION);
 		count = max(count, MIN_PEERS_PROPAGATION);
 		::rand::thread_rng().shuffle(&mut peers);
@@ -1844,16 +1856,20 @@ impl ChainSync {
 		peers
 	}
 
-	/// propagates latest block to lagging peers
+	fn get_consensus_peers(&self) -> Vec<PeerId> {
-	fn propagate_blocks(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo, sealed: &[H256], peers: &[PeerId]) -> usize {
+		self.peers.iter().filter_map(|(id, p)| if p.protocol_version == PROTOCOL_VERSION_2 { Some(*id) } else { None }).collect()
+	}
+
+	/// propagates latest block to a set of peers
+	fn propagate_blocks(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo, blocks: &[H256], peers: &[PeerId]) -> usize {
 		trace!(target: "sync", "Sending NewBlocks to {:?}", peers);
 		let mut sent = 0;
 		for peer_id in peers {
-			if sealed.is_empty() {
+			if blocks.is_empty() {
 				let rlp =  ChainSync::create_latest_block_rlp(io.chain());
 				self.send_packet(io, *peer_id, NEW_BLOCK_PACKET, rlp);
 			} else {
-				for h in sealed {
+				for h in blocks {
 					let rlp =  ChainSync::create_new_block_rlp(io.chain(), h);
 					self.send_packet(io, *peer_id, NEW_BLOCK_PACKET, rlp);
 				}
@@ -1971,10 +1987,10 @@ impl ChainSync {
 	fn propagate_latest_blocks(&mut self, io: &mut SyncIo, sealed: &[H256]) {
 		let chain_info = io.chain().chain_info();
 		if (((chain_info.best_block_number as i64) - (self.last_sent_block_number as i64)).abs() as BlockNumber) < MAX_PEER_LAG_PROPAGATION {
-			let mut peers = self.get_lagging_peers(&chain_info, io);
+			let mut peers = self.get_lagging_peers(&chain_info);
 			if sealed.is_empty() {
 				let hashes = self.propagate_new_hashes(&chain_info, io, &peers);
-				peers = self.select_random_lagging_peers(&peers);
+				peers = ChainSync::select_random_peers(&peers);
 				let blocks = self.propagate_blocks(&chain_info, io, sealed, &peers);
 				if blocks != 0 || hashes != 0 {
 					trace!(target: "sync", "Sent latest {} blocks and {} hashes to peers.", blocks, hashes);
@@ -1989,6 +2005,21 @@ impl ChainSync {
 		self.last_sent_block_number = chain_info.best_block_number;
 	}
 
+	/// Distribute valid proposed blocks to subset of current peers.
+	fn propagate_proposed_blocks(&mut self, io: &mut SyncIo, proposed: &[Bytes]) {
+		let peers = self.get_consensus_peers();
+		trace!(target: "sync", "Sending proposed blocks to {:?}", peers);
+		for block in proposed {
+			let rlp = ChainSync::create_block_rlp(
+				block,
+				io.chain().chain_info().total_difficulty
+			);
+			for peer_id in &peers {
+				self.send_packet(io, *peer_id, NEW_BLOCK_PACKET, rlp.clone());
+			}
+		}
+	}
+
 	/// Maintain other peers. Send out any new blocks and transactions
 	pub fn maintain_sync(&mut self, io: &mut SyncIo) {
 		self.maybe_start_snapshot_sync(io);
@@ -1996,15 +2027,32 @@ impl ChainSync {
 	}
 
 	/// called when block is imported to chain - propagates the blocks and updates transactions sent to peers
-	pub fn chain_new_blocks(&mut self, io: &mut SyncIo, _imported: &[H256], invalid: &[H256], _enacted: &[H256], _retracted: &[H256], sealed: &[H256]) {
+	pub fn chain_new_blocks(&mut self, io: &mut SyncIo, _imported: &[H256], invalid: &[H256], _enacted: &[H256], _retracted: &[H256], sealed: &[H256], proposed: &[Bytes]) {
 		if io.is_chain_queue_empty() {
 			self.propagate_latest_blocks(io, sealed);
+			self.propagate_proposed_blocks(io, proposed);
 		}
 		if !invalid.is_empty() {
 			trace!(target: "sync", "Bad blocks in the queue, restarting");
 			self.restart(io);
 		}
 	}
+
+	/// Called when peer sends us new consensus packet
+	fn on_consensus_packet(io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
+		trace!(target: "sync", "Received consensus packet from {:?}", peer_id);
+		io.chain().queue_consensus_message(r.as_raw().to_vec());
+		Ok(())
+	}
+
+	/// Broadcast consensus message to peers.
+	pub fn propagate_consensus_packet(&mut self, io: &mut SyncIo, packet: Bytes) {
+		let lucky_peers = ChainSync::select_random_peers(&self.get_consensus_peers());
+		trace!(target: "sync", "Sending consensus packet to {:?}", lucky_peers);
+		for peer_id in lucky_peers {
+			self.send_packet(io, peer_id, CONSENSUS_DATA_PACKET, packet.clone());
+		}
+	}
 }
 
 #[cfg(test)]
@@ -2067,9 +2115,9 @@ mod tests {
 	#[test]
 	fn return_receipts_empty() {
 		let mut client = TestBlockChainClient::new();
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let result = ChainSync::return_receipts(&io, &UntrustedRlp::new(&[0xc0]), 0);
 
@@ -2079,10 +2127,10 @@ mod tests {
 	#[test]
 	fn return_receipts() {
 		let mut client = TestBlockChainClient::new();
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let sync = dummy_sync_with_peer(H256::new(), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let mut receipt_list = RlpStream::new_list(4);
 		receipt_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
@@ -2103,7 +2151,7 @@ mod tests {
 
 		io.sender = Some(2usize);
 		ChainSync::dispatch_packet(&RwLock::new(sync), &mut io, 0usize, super::GET_RECEIPTS_PACKET, &receipts_request);
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 	}
 
 	#[test]
@@ -2136,9 +2184,9 @@ mod tests {
 		let headers: Vec<_> = blocks.iter().map(|b| Rlp::new(b).at(0).as_raw().to_vec()).collect();
 		let hashes: Vec<_> = headers.iter().map(|h| HeaderView::new(h).sha3()).collect();
 
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let unknown: H256 = H256::new();
 		let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&unknown, 1, 0, false)), 0);
@@ -2174,10 +2222,10 @@ mod tests {
 	#[test]
 	fn return_nodes() {
 		let mut client = TestBlockChainClient::new();
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let sync = dummy_sync_with_peer(H256::new(), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let mut node_list = RlpStream::new_list(3);
 		node_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
@@ -2200,7 +2248,7 @@ mod tests {
 		io.sender = Some(2usize);
 
 		ChainSync::dispatch_packet(&RwLock::new(sync), &mut io, 0usize, super::GET_NODE_DATA_PACKET, &node_request);
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 	}
 
 	fn dummy_sync_with_peer(peer_latest_hash: H256, client: &BlockChainClient) -> ChainSync {
@@ -2231,15 +2279,12 @@ mod tests {
 	fn finds_lagging_peers() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(10), &client);
 		let chain_info = client.chain_info();
-		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &ss, &mut queue, None);
 
-		let lagging_peers = sync.get_lagging_peers(&chain_info, &io);
+		let lagging_peers = sync.get_lagging_peers(&chain_info);
 
-		assert_eq!(1, lagging_peers.len())
+		assert_eq!(1, lagging_peers.len());
 	}
 
 	#[test]
@@ -2263,62 +2308,99 @@ mod tests {
 	fn sends_new_hashes_to_lagging_peer() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
-		let peers = sync.get_lagging_peers(&chain_info, &io);
+		let peers = sync.get_lagging_peers(&chain_info);
 		let peer_count = sync.propagate_new_hashes(&chain_info, &mut io, &peers);
 
 		// 1 message should be send
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 		// 1 peer should be updated
 		assert_eq!(1, peer_count);
 		// NEW_BLOCK_HASHES_PACKET
-		assert_eq!(0x01, io.queue[0].packet_id);
+		assert_eq!(0x01, io.packets[0].packet_id);
 	}
 
 	#[test]
 	fn sends_latest_block_to_lagging_peer() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
-		let peers = sync.get_lagging_peers(&chain_info, &io);
+		let peers = sync.get_lagging_peers(&chain_info);
 		let peer_count = sync.propagate_blocks(&chain_info, &mut io, &[], &peers);
 
 		// 1 message should be send
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 		// 1 peer should be updated
 		assert_eq!(1, peer_count);
 		// NEW_BLOCK_PACKET
-		assert_eq!(0x07, io.queue[0].packet_id);
+		assert_eq!(0x07, io.packets[0].packet_id);
 	}
 
 	#[test]
 	fn sends_sealed_block() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let hash = client.block_hash(BlockId::Number(99)).unwrap();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
-		let peers = sync.get_lagging_peers(&chain_info, &io);
+		let peers = sync.get_lagging_peers(&chain_info);
 		let peer_count = sync.propagate_blocks(&chain_info, &mut io, &[hash.clone()], &peers);
 
 		// 1 message should be send
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 		// 1 peer should be updated
 		assert_eq!(1, peer_count);
 		// NEW_BLOCK_PACKET
-		assert_eq!(0x07, io.queue[0].packet_id);
+		assert_eq!(0x07, io.packets[0].packet_id);
+	}
+
+	#[test]
+	fn sends_proposed_block() {
+		let mut client = TestBlockChainClient::new();
+		client.add_blocks(2, EachBlockWith::Uncle);
+		let queue = RwLock::new(VecDeque::new());
+		let block = client.block(BlockId::Latest).unwrap();
+		let mut sync = ChainSync::new(SyncConfig::default(), &client);
+		sync.peers.insert(0,
+			PeerInfo {
+				// Messaging protocol
+				protocol_version: 2,
+				genesis: H256::zero(),
+				network_id: 0,
+				latest_hash: client.block_hash_delta_minus(1),
+				difficulty: None,
+				asking: PeerAsking::Nothing,
+				asking_blocks: Vec::new(),
+				asking_hash: None,
+				ask_time: 0,
+				last_sent_transactions: HashSet::new(),
+				expired: false,
+				confirmation: super::ForkConfirmation::Confirmed,
+				snapshot_number: None,
+				snapshot_hash: None,
+				asking_snapshot_data: None,
+				block_set: None,
+			});
+		let ss = TestSnapshotService::new();
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
+		sync.propagate_proposed_blocks(&mut io, &[block]);
+
+		// 1 message should be sent
+		assert_eq!(1, io.packets.len());
+		// NEW_BLOCK_PACKET
+		assert_eq!(0x07, io.packets[0].packet_id);
 	}
 
 	#[test]
@@ -2327,25 +2409,25 @@ mod tests {
 		client.add_blocks(100, EachBlockWith::Uncle);
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 		let peer_count = sync.propagate_new_transactions(&mut io);
 		// Try to propagate same transactions for the second time
 		let peer_count2 = sync.propagate_new_transactions(&mut io);
 		// Even after new block transactions should not be propagated twice
-		sync.chain_new_blocks(&mut io, &[], &[], &[], &[], &[]);
+		sync.chain_new_blocks(&mut io, &[], &[], &[], &[], &[], &[]);
 		// Try to propagate same transactions for the third time
 		let peer_count3 = sync.propagate_new_transactions(&mut io);
 
 		// 1 message should be send
-		assert_eq!(1, io.queue.len());
+		assert_eq!(1, io.packets.len());
 		// 1 peer should be updated but only once
 		assert_eq!(1, peer_count);
 		assert_eq!(0, peer_count2);
 		assert_eq!(0, peer_count3);
 		// TRANSACTIONS_PACKET
-		assert_eq!(0x02, io.queue[0].packet_id);
+		assert_eq!(0x02, io.packets[0].packet_id);
 	}
 
 	#[test]
@@ -2354,21 +2436,21 @@ mod tests {
 		client.add_blocks(100, EachBlockWith::Uncle);
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 		let peer_count = sync.propagate_new_transactions(&mut io);
 		io.chain.insert_transaction_to_queue();
 		// New block import should trigger propagation.
-		sync.chain_new_blocks(&mut io, &[], &[], &[], &[], &[]);
+		sync.chain_new_blocks(&mut io, &[], &[], &[], &[], &[], &[]);
 
 		// 2 message should be send
-		assert_eq!(2, io.queue.len());
+		assert_eq!(2, io.packets.len());
 		// 1 peer should receive the message
 		assert_eq!(1, peer_count);
 		// TRANSACTIONS_PACKET
-		assert_eq!(0x02, io.queue[0].packet_id);
+		assert_eq!(0x02, io.packets[0].packet_id);
-		assert_eq!(0x02, io.queue[1].packet_id);
+		assert_eq!(0x02, io.packets[1].packet_id);
 	}
 
 	#[test]
@@ -2377,31 +2459,34 @@ mod tests {
 		client.add_blocks(100, EachBlockWith::Uncle);
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
 		// should sent some
 		{
-			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+			let mut io = TestIo::new(&mut client, &ss, &queue, None);
 			let peer_count = sync.propagate_new_transactions(&mut io);
-			assert_eq!(1, io.queue.len());
+			assert_eq!(1, io.packets.len());
 			assert_eq!(1, peer_count);
 		}
 		// Insert some more
 		client.insert_transaction_to_queue();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let (peer_count2, peer_count3) = {
-		// Propagate new transactions
+			let mut io = TestIo::new(&mut client, &ss, &queue, None);
-		let peer_count2 = sync.propagate_new_transactions(&mut io);
+			// Propagate new transactions
-		// And now the peer should have all transactions
+			let peer_count2 = sync.propagate_new_transactions(&mut io);
-		let peer_count3 = sync.propagate_new_transactions(&mut io);
+			// And now the peer should have all transactions
+			let peer_count3 = sync.propagate_new_transactions(&mut io);
+			(peer_count2, peer_count3)
+		};
 
 		// 2 message should be send (in total)
-		assert_eq!(2, io.queue.len());
+		assert_eq!(2, queue.read().len());
 		// 1 peer should be updated but only once after inserting new transaction
 		assert_eq!(1, peer_count2);
 		assert_eq!(0, peer_count3);
 		// TRANSACTIONS_PACKET
-		assert_eq!(0x02, io.queue[0].packet_id);
+		assert_eq!(0x02, queue.read()[0].packet_id);
-		assert_eq!(0x02, io.queue[1].packet_id);
+		assert_eq!(0x02, queue.read()[1].packet_id);
 	}
 
 	#[test]
@@ -2410,9 +2495,9 @@ mod tests {
 		client.add_blocks(100, EachBlockWith::Uncle);
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 		sync.propagate_new_transactions(&mut io);
 
 		let stats = sync.transactions_stats();
@@ -2426,11 +2511,11 @@ mod tests {
 
 		let block_data = get_dummy_block(11, client.chain_info().best_block_hash);
 
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		//sync.have_common_block = true;
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let block = UntrustedRlp::new(&block_data);
 
@@ -2446,10 +2531,10 @@ mod tests {
 
 		let block_data = get_dummy_blocks(11, client.chain_info().best_block_hash);
 
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let block = UntrustedRlp::new(&block_data);
 
@@ -2462,10 +2547,10 @@ mod tests {
 	fn handles_peer_new_block_empty() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(10, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let empty_data = vec![];
 		let block = UntrustedRlp::new(&empty_data);
@@ -2479,10 +2564,10 @@ mod tests {
 	fn handles_peer_new_hashes() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(10, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let hashes_data = get_dummy_hashes();
 		let hashes_rlp = UntrustedRlp::new(&hashes_data);
@@ -2496,10 +2581,10 @@ mod tests {
 	fn handles_peer_new_hashes_empty() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(10, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		let empty_hashes_data = vec![];
 		let hashes_rlp = UntrustedRlp::new(&empty_hashes_data);
@@ -2515,16 +2600,16 @@ mod tests {
 	fn hashes_rlp_mutually_acceptable() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
-		let peers = sync.get_lagging_peers(&chain_info, &io);
+		let peers = sync.get_lagging_peers(&chain_info);
 		sync.propagate_new_hashes(&chain_info, &mut io, &peers);
 
-		let data = &io.queue[0].data.clone();
+		let data = &io.packets[0].data.clone();
 		let result = sync.on_peer_new_hashes(&mut io, 0, &UntrustedRlp::new(data));
 		assert!(result.is_ok());
 	}
@@ -2535,16 +2620,16 @@ mod tests {
 	fn block_rlp_mutually_acceptable() {
 		let mut client = TestBlockChainClient::new();
 		client.add_blocks(100, EachBlockWith::Uncle);
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
-		let peers = sync.get_lagging_peers(&chain_info, &io);
+		let peers = sync.get_lagging_peers(&chain_info);
 		sync.propagate_blocks(&chain_info, &mut io, &[], &peers);
 
-		let data = &io.queue[0].data.clone();
+		let data = &io.packets[0].data.clone();
 		let result = sync.on_peer_new_block(&mut io, 0, &UntrustedRlp::new(data));
 		assert!(result.is_ok());
 	}
@@ -2572,11 +2657,11 @@ mod tests {
 
 		// when
 		{
-			let mut queue = VecDeque::new();
+			let queue = RwLock::new(VecDeque::new());
 			let ss = TestSnapshotService::new();
-			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+			let mut io = TestIo::new(&mut client, &ss, &queue, None);
 			io.chain.miner.chain_new_blocks(io.chain, &[], &[], &[], &good_blocks);
-			sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[]);
+			sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[], &[]);
 			assert_eq!(io.chain.miner.status().transactions_in_future_queue, 0);
 			assert_eq!(io.chain.miner.status().transactions_in_pending_queue, 1);
 		}
@@ -2587,11 +2672,11 @@ mod tests {
 			client.set_nonce(view.transactions()[0].sender().unwrap(), U256::from(1));
 		}
 		{
-			let mut queue = VecDeque::new();
+			let queue = RwLock::new(VecDeque::new());
 			let ss = TestSnapshotService::new();
-			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+			let mut io = TestIo::new(&client, &ss, &queue, None);
 			io.chain.miner.chain_new_blocks(io.chain, &[], &[], &good_blocks, &retracted_blocks);
-			sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks, &[]);
+			sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks, &[], &[]);
 		}
 
 		// then
@@ -2612,15 +2697,15 @@ mod tests {
 		let good_blocks = vec![client.block_hash_delta_minus(2)];
 		let retracted_blocks = vec![client.block_hash_delta_minus(1)];
 
-		let mut queue = VecDeque::new();
+		let queue = RwLock::new(VecDeque::new());
 		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &queue, None);
 
 		// when
-		sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[]);
+		sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[], &[]);
 		assert_eq!(io.chain.miner.status().transactions_in_future_queue, 0);
 		assert_eq!(io.chain.miner.status().transactions_in_pending_queue, 0);
-		sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks, &[]);
+		sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks, &[], &[]);
 
 		// then
 		let status = io.chain.miner.status();

sync/src/tests/chain.rs

@@ -101,7 +101,7 @@ fn forked_with_misbehaving_peer() {
 	::env_logger::init().ok();
 	let mut net = TestNet::new(3);
 	// peer 0 is on a totally different chain with higher total difficulty
-	net.peer_mut(0).chain = TestBlockChainClient::new_with_extra_data(b"fork".to_vec());
+	net.peer_mut(0).chain = Arc::new(TestBlockChainClient::new_with_extra_data(b"fork".to_vec()));
 	net.peer(0).chain.add_blocks(50, EachBlockWith::Nothing);
 	net.peer(1).chain.add_blocks(10, EachBlockWith::Nothing);
 	net.peer(2).chain.add_blocks(10, EachBlockWith::Nothing);

sync/src/tests/consensus.rs

@@ -15,7 +15,9 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use util::*;
-use ethcore::client::BlockChainClient;
+use io::{IoHandler, IoContext, IoChannel};
+use ethcore::client::{BlockChainClient, Client, MiningBlockChainClient};
+use ethcore::service::ClientIoMessage;
 use ethcore::spec::Spec;
 use ethcore::miner::MinerService;
 use ethcore::transaction::*;
@@ -24,55 +26,171 @@ use ethkey::KeyPair;
 use super::helpers::*;
 use SyncConfig;
 
-#[test]
+struct TestIoHandler {
-fn test_authority_round() {
+	client: Arc<Client>,
-	::env_logger::init().ok();
+}
 
-	let s1 = KeyPair::from_secret("1".sha3()).unwrap();
+impl IoHandler<ClientIoMessage> for TestIoHandler {
-	let s2 = KeyPair::from_secret("0".sha3()).unwrap();
+	fn message(&self, _io: &IoContext<ClientIoMessage>, net_message: &ClientIoMessage) {
-	let spec_factory = || {
+		match *net_message {
-		let spec = Spec::new_test_round();
+			ClientIoMessage::UpdateSealing => self.client.update_sealing(),
-		let account_provider = AccountProvider::transient_provider();
+			ClientIoMessage::SubmitSeal(ref hash, ref seal) => self.client.submit_seal(*hash, seal.clone()),
-		account_provider.insert_account(s1.secret().clone(), "").unwrap();
+			ClientIoMessage::BroadcastMessage(ref message) => self.client.broadcast_consensus_message(message.clone()),
-		account_provider.insert_account(s2.secret().clone(), "").unwrap();
+			ClientIoMessage::NewMessage(ref message) => if let Err(e) = self.client.engine().handle_message(message) {
-		spec.engine.register_account_provider(Arc::new(account_provider));
+				panic!("Invalid message received: {}", e);
-		spec
+			},
-	};
+			_ => {} // ignore other messages
-	let mut net = TestNet::new_with_spec(2, SyncConfig::default(), spec_factory);
+		}
-	let mut net = &mut *net;
+	}
-	// Push transaction to both clients. Only one of them gets lucky to mine a block.
+}
-	net.peer(0).chain.miner().set_author(s1.address());
+
-	net.peer(0).chain.engine().set_signer(s1.address(), "".to_owned());
+fn new_tx(secret: &H256, nonce: U256) -> SignedTransaction {
-	net.peer(1).chain.miner().set_author(s2.address());
+	Transaction {
-	net.peer(1).chain.engine().set_signer(s2.address(), "".to_owned());
+		nonce: nonce.into(),
-	let tx1 = Transaction {
-		nonce: 0.into(),
 		gas_price: 0.into(),
 		gas: 21000.into(),
 		action: Action::Call(Address::default()),
 		value: 0.into(),
 		data: Vec::new(),
-	}.sign(s1.secret(), None);
+	}.sign(secret, None)
-	// exhange statuses
+}
-	net.sync_steps(5);
+
-	net.peer(0).chain.miner().import_own_transaction(&net.peer(0).chain, tx1).unwrap();
+#[test]
+fn authority_round() {
+	let s0 = KeyPair::from_secret("1".sha3()).unwrap();
+	let s1 = KeyPair::from_secret("0".sha3()).unwrap();
+	let spec_factory = || {
+		let spec = Spec::new_test_round();
+		let account_provider = AccountProvider::transient_provider();
+		account_provider.insert_account(s0.secret().clone(), "").unwrap();
+		account_provider.insert_account(s1.secret().clone(), "").unwrap();
+		spec.engine.register_account_provider(Arc::new(account_provider));
+		spec
+	};
+	let mut net = TestNet::with_spec(2, SyncConfig::default(), spec_factory);
+	let mut net = &mut *net;
+	let io_handler0: Arc<IoHandler<ClientIoMessage>> = Arc::new(TestIoHandler { client: net.peer(0).chain.clone() });
+	let io_handler1: Arc<IoHandler<ClientIoMessage>> = Arc::new(TestIoHandler { client: net.peer(1).chain.clone() });
+	// Push transaction to both clients. Only one of them gets lucky to produce a block.
+	net.peer(0).chain.miner().set_engine_signer(s0.address(), "".to_owned()).unwrap();
+	net.peer(1).chain.miner().set_engine_signer(s1.address(), "".to_owned()).unwrap();
+	net.peer(0).chain.engine().register_message_channel(IoChannel::to_handler(Arc::downgrade(&io_handler0)));
+	net.peer(1).chain.engine().register_message_channel(IoChannel::to_handler(Arc::downgrade(&io_handler1)));
+	net.peer(0).chain.set_io_channel(IoChannel::to_handler(Arc::downgrade(&io_handler1)));
+	net.peer(1).chain.set_io_channel(IoChannel::to_handler(Arc::downgrade(&io_handler0)));
+	// exchange statuses
+	net.sync();
+	// Trigger block proposal
+	net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 0.into())).unwrap();
+	// Sync a block
 	net.sync();
 	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 1);
 	assert_eq!(net.peer(1).chain.chain_info().best_block_number, 1);
 
-	let tx2 = Transaction {
+	net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 0.into())).unwrap();
-		nonce: 0.into(),
+	// Move to next proposer step
-		gas_price: 0.into(),
+	net.peer(0).chain.engine().step();
-		gas: 21000.into(),
-		action: Action::Call(Address::default()),
-		value: 0.into(),
-		data: Vec::new(),
-	}.sign(s2.secret(), None);
-	net.peer(1).chain.miner().import_own_transaction(&net.peer(1).chain, tx2).unwrap();
 	net.peer(1).chain.engine().step();
-	net.peer(1).chain.miner().update_sealing(&net.peer(1).chain);
 	net.sync();
 	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 2);
 	assert_eq!(net.peer(1).chain.chain_info().best_block_number, 2);
+
+	// Fork the network
+	net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 1.into())).unwrap();
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 3);
+	net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 1.into())).unwrap();
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	assert_eq!(net.peer(1).chain.chain_info().best_block_number, 3);
+	// Reorg to the correct one.
+	net.sync();
+	let ci0 = net.peer(0).chain.chain_info();
+	let ci1 = net.peer(1).chain.chain_info();
+	assert_eq!(ci0.best_block_number, 3);
+	assert_eq!(ci1.best_block_number, 3);
+	assert_eq!(ci0.best_block_hash, ci1.best_block_hash);
 }
 
+#[test]
+fn tendermint() {
+	let s0 = KeyPair::from_secret("1".sha3()).unwrap();
+	let s1 = KeyPair::from_secret("0".sha3()).unwrap();
+	let spec_factory = || {
+		let spec = Spec::new_test_tendermint();
+		let account_provider = AccountProvider::transient_provider();
+		account_provider.insert_account(s0.secret().clone(), "").unwrap();
+		account_provider.insert_account(s1.secret().clone(), "").unwrap();
+		spec.engine.register_account_provider(Arc::new(account_provider));
+		spec
+	};
+	let mut net = TestNet::with_spec(2, SyncConfig::default(), spec_factory);
+	let mut net = &mut *net;
+	let io_handler0: Arc<IoHandler<ClientIoMessage>> = Arc::new(TestIoHandler { client: net.peer(0).chain.clone() });
+	let io_handler1: Arc<IoHandler<ClientIoMessage>> = Arc::new(TestIoHandler { client: net.peer(1).chain.clone() });
+	// Push transaction to both clients. Only one of them issues a proposal.
+	net.peer(0).chain.miner().set_engine_signer(s0.address(), "".to_owned()).unwrap();
+	trace!(target: "poa", "Peer 0 is {}.", s0.address());
+	net.peer(1).chain.miner().set_engine_signer(s1.address(), "".to_owned()).unwrap();
+	trace!(target: "poa", "Peer 1 is {}.", s1.address());
+	net.peer(0).chain.engine().register_message_channel(IoChannel::to_handler(Arc::downgrade(&io_handler0)));
+	net.peer(1).chain.engine().register_message_channel(IoChannel::to_handler(Arc::downgrade(&io_handler1)));
+	net.peer(0).chain.set_io_channel(IoChannel::to_handler(Arc::downgrade(&io_handler0)));
+	net.peer(1).chain.set_io_channel(IoChannel::to_handler(Arc::downgrade(&io_handler1)));
+	// Exhange statuses
+	net.sync();
+	// Propose
+	net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 0.into())).unwrap();
+	net.sync();
+	// Propose timeout, synchronous for now
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	// Prevote, precommit and commit
+	net.sync();
+
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 1);
+	assert_eq!(net.peer(1).chain.chain_info().best_block_number, 1);
+
+	net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 0.into())).unwrap();
+	// Commit timeout
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	// Propose
+	net.sync();
+	// Propose timeout
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	// Prevote, precommit and commit
+	net.sync();
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 2);
+	assert_eq!(net.peer(1).chain.chain_info().best_block_number, 2);
+
+	net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 1.into())).unwrap();
+	net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 1.into())).unwrap();
+	// Peers get disconnected.
+	// Commit
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	// Propose
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+net.peer(0).chain.miner().import_own_transaction(&*net.peer(0).chain, new_tx(s0.secret(), 2.into())).unwrap();
+		net.peer(1).chain.miner().import_own_transaction(&*net.peer(1).chain, new_tx(s1.secret(), 2.into())).unwrap();
+	// Send different prevotes
+	net.sync();
+	// Prevote timeout
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	// Precommit and commit
+	net.sync();
+	// Propose timeout
+	net.peer(0).chain.engine().step();
+	net.peer(1).chain.engine().step();
+	net.sync();
+	let ci0 = net.peer(0).chain.chain_info();
+	let ci1 = net.peer(1).chain.chain_info();
+	assert_eq!(ci0.best_block_number, 3);
+	assert_eq!(ci1.best_block_number, 3);
+	assert_eq!(ci0.best_block_hash, ci1.best_block_hash);
+}

sync/src/tests/helpers.rs

@@ -45,14 +45,15 @@ impl FlushingBlockChainClient for TestBlockChainClient {}
 pub struct TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 	pub chain: &'p C,
 	pub snapshot_service: &'p TestSnapshotService,
-	pub queue: &'p mut VecDeque<TestPacket>,
+	pub queue: &'p RwLock<VecDeque<TestPacket>>,
 	pub sender: Option<PeerId>,
 	pub to_disconnect: HashSet<PeerId>,
+	pub packets: Vec<TestPacket>,
 	overlay: RwLock<HashMap<BlockNumber, Bytes>>,
 }
 
 impl<'p, C> TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
-	pub fn new(chain: &'p C, ss: &'p TestSnapshotService, queue: &'p mut VecDeque<TestPacket>, sender: Option<PeerId>) -> TestIo<'p, C> {
+	pub fn new(chain: &'p C, ss: &'p TestSnapshotService, queue: &'p RwLock<VecDeque<TestPacket>>, sender: Option<PeerId>) -> TestIo<'p, C> {
 		TestIo {
 			chain: chain,
 			snapshot_service: ss,
@@ -60,10 +61,17 @@ impl<'p, C> TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 			sender: sender,
 			to_disconnect: HashSet::new(),
 			overlay: RwLock::new(HashMap::new()),
+			packets: Vec::new(),
 		}
 	}
 }
 
+impl<'p, C> Drop for TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
+	fn drop(&mut self) {
+		self.queue.write().extend(self.packets.drain(..));
+	}
+}
+
 impl<'p, C> SyncIo for TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 	fn disable_peer(&mut self, peer_id: PeerId) {
 		self.disconnect_peer(peer_id);
@@ -78,7 +86,7 @@ impl<'p, C> SyncIo for TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 	}
 
 	fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError> {
-		self.queue.push_back(TestPacket {
+		self.packets.push(TestPacket {
 			data: data,
 			packet_id: packet_id,
 			recipient: self.sender.unwrap()
@@ -87,7 +95,7 @@ impl<'p, C> SyncIo for TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 	}
 
 	fn send(&mut self, peer_id: PeerId, packet_id: PacketId, data: Vec<u8>) -> Result<(), NetworkError> {
-		self.queue.push_back(TestPacket {
+		self.packets.push(TestPacket {
 			data: data,
 			packet_id: packet_id,
 			recipient: peer_id,
@@ -100,7 +108,7 @@ impl<'p, C> SyncIo for TestIo<'p, C> where C: FlushingBlockChainClient, C: 'p {
 	}
 
 	fn chain(&self) -> &BlockChainClient {
-		self.chain
+		&*self.chain
 	}
 
 	fn snapshot_service(&self) -> &SnapshotService {
@@ -131,7 +139,7 @@ pub struct TestPacket {
 }
 
 pub struct TestPeer<C> where C: FlushingBlockChainClient {
-	pub chain: C,
+	pub chain: Arc<C>,
 	pub snapshot_service: Arc<TestSnapshotService>,
 	pub sync: RwLock<ChainSync>,
 	pub queue: RwLock<VecDeque<TestPacket>>,
@@ -167,7 +175,7 @@ impl TestNet<TestBlockChainClient> {
 			net.peers.push(Arc::new(TestPeer {
 				sync: RwLock::new(sync),
 				snapshot_service: ss,
-				chain: chain,
+				chain: Arc::new(chain),
 				queue: RwLock::new(VecDeque::new()),
 			}));
 		}
@@ -176,7 +184,7 @@ impl TestNet<TestBlockChainClient> {
 }
 
 impl TestNet<EthcoreClient> {
-	pub fn new_with_spec<F>(n: usize, config: SyncConfig, spec_factory: F) -> GuardedTempResult<TestNet<EthcoreClient>>
+	pub fn with_spec<F>(n: usize, config: SyncConfig, spec_factory: F) -> GuardedTempResult<TestNet<EthcoreClient>>
 		where F: Fn() -> Spec
 	{
 		let mut net = TestNet {
@@ -192,17 +200,17 @@ impl TestNet<EthcoreClient> {
 			let db_config = DatabaseConfig::with_columns(NUM_COLUMNS);
 
 			let spec = spec_factory();
-			let client = Arc::try_unwrap(EthcoreClient::new(
+			let client = EthcoreClient::new(
 				ClientConfig::default(),
 				&spec,
 				client_dir.as_path(),
 				Arc::new(Miner::with_spec(&spec)),
 				IoChannel::disconnected(),
 				&db_config
-			).unwrap()).ok().unwrap();
+			).unwrap();
 
 			let ss = Arc::new(TestSnapshotService::new());
-			let sync = ChainSync::new(config.clone(), &client);
+			let sync = ChainSync::new(config.clone(), &*client);
 			let peer = Arc::new(TestPeer {
 				sync: RwLock::new(sync),
 				snapshot_service: ss,
@@ -229,33 +237,38 @@ impl<C> TestNet<C> where C: FlushingBlockChainClient {
 	}
 
 	pub fn start(&mut self) {
+		if self.started {
+			return;
+		}
 		for peer in 0..self.peers.len() {
 			for client in 0..self.peers.len() {
 				if peer != client {
 					let p = &self.peers[peer];
-					p.sync.write().update_targets(&p.chain);
+					p.sync.write().update_targets(&*p.chain);
-					p.sync.write().on_peer_connected(&mut TestIo::new(&p.chain, &p.snapshot_service, &mut p.queue.write(), Some(client as PeerId)), client as PeerId);
+					p.sync.write().on_peer_connected(&mut TestIo::new(&*p.chain, &p.snapshot_service, &p.queue, Some(client as PeerId)), client as PeerId);
 				}
 			}
 		}
+		self.started = true;
 	}
 
 	pub fn sync_step(&mut self) {
 		for peer in 0..self.peers.len() {
+			self.peers[peer].chain.flush();
 			let packet = self.peers[peer].queue.write().pop_front();
 			if let Some(packet) = packet {
 				let disconnecting = {
 					let p = &self.peers[packet.recipient];
-					let mut queue = p.queue.write();
 					trace!("--- {} -> {} ---", peer, packet.recipient);
 					let to_disconnect = {
-						let mut io = TestIo::new(&p.chain, &p.snapshot_service, &mut queue, Some(peer as PeerId));
+						let mut io = TestIo::new(&*p.chain, &p.snapshot_service, &p.queue, Some(peer as PeerId));
 						ChainSync::dispatch_packet(&p.sync, &mut io, peer as PeerId, packet.packet_id, &packet.data);
-						io.to_disconnect
+						p.chain.flush();
+						io.to_disconnect.clone()
 					};
 					for d in &to_disconnect {
 						// notify this that disconnecting peers are disconnecting
-						let mut io = TestIo::new(&p.chain, &p.snapshot_service, &mut queue, Some(*d));
+						let mut io = TestIo::new(&*p.chain, &p.snapshot_service, &p.queue, Some(*d));
 						p.sync.write().on_peer_aborting(&mut io, *d);
 						self.disconnect_events.push((peer, *d));
 					}
@@ -264,8 +277,7 @@ impl<C> TestNet<C> where C: FlushingBlockChainClient {
 				for d in &disconnecting {
 					// notify other peers that this peer is disconnecting
 					let p = &self.peers[*d];
-					let mut queue = p.queue.write();
+					let mut io = TestIo::new(&*p.chain, &p.snapshot_service, &p.queue, Some(peer as PeerId));
-					let mut io = TestIo::new(&p.chain, &p.snapshot_service, &mut queue, Some(peer as PeerId));
 					p.sync.write().on_peer_aborting(&mut io, peer as PeerId);
 				}
 			}
@@ -277,15 +289,14 @@ impl<C> TestNet<C> where C: FlushingBlockChainClient {
 	pub fn sync_step_peer(&mut self, peer_num: usize) {
 		let peer = self.peer(peer_num);
 		peer.chain.flush();
-		let mut queue = peer.queue.write();
+		peer.sync.write().maintain_peers(&mut TestIo::new(&*peer.chain, &peer.snapshot_service, &peer.queue, None));
-		peer.sync.write().maintain_peers(&mut TestIo::new(&peer.chain, &peer.snapshot_service, &mut queue, None));
+		peer.sync.write().maintain_sync(&mut TestIo::new(&*peer.chain, &peer.snapshot_service, &peer.queue, None));
-		peer.sync.write().maintain_sync(&mut TestIo::new(&peer.chain, &peer.snapshot_service, &mut queue, None));
+		peer.sync.write().propagate_new_transactions(&mut TestIo::new(&*peer.chain, &peer.snapshot_service, &peer.queue, None));
-		peer.sync.write().propagate_new_transactions(&mut TestIo::new(&peer.chain, &peer.snapshot_service, &mut queue, None));
 	}
 
 	pub fn restart_peer(&mut self, i: usize) {
 		let peer = self.peer(i);
-		peer.sync.write().restart(&mut TestIo::new(&peer.chain, &peer.snapshot_service, &mut peer.queue.write(), None));
+		peer.sync.write().restart(&mut TestIo::new(&*peer.chain, &peer.snapshot_service, &peer.queue, None));
 	}
 
 	pub fn sync(&mut self) -> u32 {
@@ -299,10 +310,7 @@ impl<C> TestNet<C> where C: FlushingBlockChainClient {
 	}
 
 	pub fn sync_steps(&mut self, count: usize) {
-		if !self.started {
+		self.start();
-			self.start();
-			self.started = true;
-		}
 		for _ in 0..count {
 			self.sync_step();
 		}
@@ -314,8 +322,7 @@ impl<C> TestNet<C> where C: FlushingBlockChainClient {
 
 	pub fn trigger_chain_new_blocks(&mut self, peer_id: usize) {
 		let peer = self.peer(peer_id);
-		let mut queue = peer.queue.write();
+		peer.sync.write().chain_new_blocks(&mut TestIo::new(&*peer.chain, &peer.snapshot_service, &peer.queue, None), &[], &[], &[], &[], &[], &[]);
-		peer.sync.write().chain_new_blocks(&mut TestIo::new(&peer.chain, &peer.snapshot_service, &mut queue, None), &[], &[], &[], &[], &[]);
 	}
 }
 
@@ -326,21 +333,26 @@ impl ChainNotify for TestPeer<EthcoreClient> {
 		enacted: Vec<H256>,
 		retracted: Vec<H256>,
 		sealed: Vec<H256>,
+		proposed: Vec<Bytes>,
 		_duration: u64)
 	{
-		let mut queue = self.queue.write();
+		let mut io = TestIo::new(&*self.chain, &self.snapshot_service, &self.queue, None);
-		let mut io = TestIo::new(&self.chain, &self.snapshot_service, &mut queue, None);
 		self.sync.write().chain_new_blocks(
 			&mut io,
 			&imported,
 			&invalid,
 			&enacted,
 			&retracted,
-			&sealed);
+			&sealed,
+			&proposed);
 	}
 
 	fn start(&self) {}
 
 	fn stop(&self) {}
-}
 
+	fn broadcast(&self, message: Vec<u8>) {
+		let mut io = TestIo::new(&*self.chain, &self.snapshot_service, &self.queue, None);
+		self.sync.write().propagate_consensus_packet(&mut io, message.clone());
+	}
+}

util/io/src/service.rs

@@ -329,11 +329,18 @@ impl<Message> Handler for IoManager<Message> where Message: Send + Clone + Sync
 	}
 }
 
+#[derive(Clone)]
+enum Handlers<Message> where Message: Send + Clone {
+	SharedCollection(Weak<RwLock<Slab<Arc<IoHandler<Message>>, HandlerId>>>),
+	Single(Weak<IoHandler<Message>>),
+}
+
 /// Allows sending messages into the event loop. All the IO handlers will get the message
 /// in the `message` callback.
 pub struct IoChannel<Message> where Message: Send + Clone{
 	channel: Option<Sender<IoMessage<Message>>>,
-	handlers: Weak<RwLock<Slab<Arc<IoHandler<Message>>, HandlerId>>>,
+	handlers: Handlers<Message>,
+
 }
 
 impl<Message> Clone for IoChannel<Message> where Message: Send + Clone + Sync + 'static {
@@ -348,19 +355,29 @@ impl<Message> Clone for IoChannel<Message> where Message: Send + Clone + Sync +
 impl<Message> IoChannel<Message> where Message: Send + Clone + Sync + 'static {
 	/// Send a message through the channel
 	pub fn send(&self, message: Message) -> Result<(), IoError> {
-		if let Some(ref channel) = self.channel {
+		match self.channel {
-			try!(channel.send(IoMessage::UserMessage(message)));
+			Some(ref channel) => try!(channel.send(IoMessage::UserMessage(message))),
+			None => try!(self.send_sync(message))
 		}
 		Ok(())
 	}
 
 	/// Send a message through the channel and handle it synchronously
 	pub fn send_sync(&self, message: Message) -> Result<(), IoError> {
-		if let Some(handlers) = self.handlers.upgrade() {
+		match self.handlers {
-			for id in 0 .. MAX_HANDLERS {
+			Handlers::SharedCollection(ref handlers) => {
-				if let Some(h) = handlers.read().get(id) {
+				if let Some(handlers) = handlers.upgrade() {
-					let handler = h.clone();
+					for id in 0 .. MAX_HANDLERS {
-					handler.message(&IoContext::new(self.clone(), id), &message);
+						if let Some(h) = handlers.read().get(id) {
+							let handler = h.clone();
+							handler.message(&IoContext::new(self.clone(), id), &message);
+						}
+					}
+				}
+			},
+			Handlers::Single(ref handler) => {
+				if let Some(handler) = handler.upgrade() {
+					handler.message(&IoContext::new(self.clone(), 0), &message);
 				}
 			}
 		}
@@ -378,14 +395,21 @@ impl<Message> IoChannel<Message> where Message: Send + Clone + Sync + 'static {
 	pub fn disconnected() -> IoChannel<Message> {
 		IoChannel {
 			channel: None,
-			handlers: Weak::default(),
+			handlers: Handlers::SharedCollection(Weak::default()),
 		}
 	}
 
+	/// Create a new synchronous channel to a given handler.
+	pub fn to_handler(handler: Weak<IoHandler<Message>>) -> IoChannel<Message> {
+		IoChannel {
+			channel: None,
+			handlers: Handlers::Single(handler),
+		}
+	}
 	fn new(channel: Sender<IoMessage<Message>>, handlers: Weak<RwLock<Slab<Arc<IoHandler<Message>>, HandlerId>>>) -> IoChannel<Message> {
 		IoChannel {
 			channel: Some(channel),
-			handlers: handlers,
+			handlers: Handlers::SharedCollection(handlers),
 		}
 	}
 }