Auto-updater improvements (#8078)

* updater: refactor updater flow into state machine

* updater: delay update randomly within max range

* updater: configurable update delay

* updater: split polling and updater state machine step

* updater: drop state to avoid deadlocking

* updater: fix fetch backoff

* updater: fix overflow in update delay calculation

* updater: configurable update check frequency

* updater: fix update policy frequency comparison

* updater: use lazy_static for platform and platform_id_hash

* updater: refactor operations contract calls into OperationsClient

* updater: make updater generic over operations and fetch client

* updater: fix compilation

* updater: add testing infrastructure and minimal test

* updater: fix minor grumbles

* updater: add test for successful updater flow

* updater: add test for update delay

* updater: add test for update check frequency

* updater: mock time and rng for deterministic tests

* updater: test backoff on failure

* updater: add test for backoff short-circuit on new release

* updater: refactor to increase readability

* updater: cap maximum backoff to one month

* updater: add test for detecting already downloaded update

* updater: add test for updater disable on fatal errors

* updater: add test for pending outdated fetch

* updater: test auto install of updates

* updater: add test for capability updates

* updater: fix capability update

* updater: use ethabi to create event topic filter

* updater: decrease maximum backoff to 1 day

* updater: cap maximum update delay with upcoming fork block number

* updater: receive state mutex guard in updater_step

* updater: overload execute_upgrade to take state mutex guard

* updater: remove unnecessary clone of latest operations info

* updater: remove latest operations info clone when triggering fetch

updater/Cargo.toml

@@ -6,6 +6,8 @@ license = "GPL-3.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
+keccak-hash = { path = "../util/hash" }
+lazy_static = "1.0"
 log = "0.3"
 ethabi = "5.1"
 ethabi-derive = "5.0"
@@ -20,3 +22,8 @@ parking_lot = "0.5"
 parity-hash-fetch = { path = "../hash-fetch" }
 parity-version = { path = "../util/version" }
 path = { path = "../util/path" }
+rand = "0.4"
+
+[dev-dependencies]
+tempdir = "0.3"
+matches = "0.1"

updater/res/operations.json

@@ -556,5 +556,42 @@
 		],
 		"payable": false,
 		"type": "function"
+	},
+	{
+		"name": "ReleaseAdded",
+		"type": "event",
+		"anonymous": false,
+		"inputs": [
+			{
+				"indexed": true,
+				"name": "client",
+				"type": "bytes32"
+			},
+			{
+				"indexed": true,
+				"name": "forkBlock",
+				"type": "uint32"
+			},
+			{
+				"indexed": false,
+				"name": "release",
+				"type": "bytes32"
+			},
+			{
+				"indexed": false,
+				"name": "track",
+				"type": "uint8"
+			},
+			{
+				"indexed": false,
+				"name": "semver",
+				"type": "uint24"
+			},
+			{
+				"indexed": true,
+				"name": "critical",
+				"type": "bool"
+			}
+		]
 	}
 ]

updater/src/lib.rs

@@ -21,10 +21,12 @@ extern crate ethcore;
 extern crate ethcore_bytes as bytes;
 extern crate ethereum_types;
 extern crate ethsync;
+extern crate keccak_hash as hash;
 extern crate parity_hash_fetch as hash_fetch;
 extern crate parity_version as version;
 extern crate parking_lot;
 extern crate path;
+extern crate rand;
 extern crate semver;
 extern crate target_info;
 
@@ -33,8 +35,17 @@ extern crate ethabi_contract;
 #[macro_use]
 extern crate ethabi_derive;
 #[macro_use]
+extern crate lazy_static;
+#[macro_use]
 extern crate log;
 
+#[cfg(test)]
+extern crate tempdir;
+
+#[cfg(test)]
+#[macro_use]
+extern crate matches;
+
 mod updater;
 mod types;
 mod service;