store epoch transition proofs in DB

util/Cargo.toml

@@ -16,7 +16,7 @@ time = "0.1.34"
 rocksdb = { git = "https://github.com/paritytech/rust-rocksdb" }
 eth-secp256k1 = { git = "https://github.com/paritytech/rust-secp256k1" }
 rust-crypto = "0.2.34"
-elastic-array = { git = "https://github.com/paritytech/elastic-array" }
+elastic-array = "0.7.0"
 rlp = { path = "rlp" }
 heapsize = { version = "0.3", features = ["unstable"] }
 itertools = "0.5"

util/rlp/Cargo.toml

@@ -6,7 +6,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-elastic-array = { git = "https://github.com/paritytech/elastic-array" }
+elastic-array = "0.7.0"
 ethcore-bigint = { path = "../bigint" }
 lazy_static = "0.2"
 rustc-serialize = "0.3"

util/src/journaldb/mod.rs

@@ -125,8 +125,8 @@ pub fn new(backing: Arc<::kvdb::KeyValueDB>, algorithm: Algorithm, col: Option<u
 }
 
 // all keys must be at least 12 bytes
-const DB_PREFIX_LEN : usize = 12;
-const LATEST_ERA_KEY : [u8; DB_PREFIX_LEN] = [ b'l', b'a', b's', b't', 0, 0, 0, 0, 0, 0, 0, 0 ];
+const DB_PREFIX_LEN : usize = ::kvdb::PREFIX_LEN;
+const LATEST_ERA_KEY : [u8; ::kvdb::PREFIX_LEN] = [ b'l', b'a', b's', b't', 0, 0, 0, 0, 0, 0, 0, 0 ];
 
 #[cfg(test)]
 mod tests {

util/src/kvdb.rs

@@ -36,6 +36,9 @@ use std::fs::File;
 const DB_BACKGROUND_FLUSHES: i32 = 2;
 const DB_BACKGROUND_COMPACTIONS: i32 = 2;
 
+/// Required length of prefixes.
+pub const PREFIX_LEN: usize = 12;
+
 /// Write transaction. Batches a sequence of put/delete operations for efficiency.
 #[derive(Default, Clone, PartialEq)]
 pub struct DBTransaction {