Private contract migration and offchain state sync

ethcore/db/src/db.rs

@@ -41,8 +41,10 @@ pub const COL_ACCOUNT_BLOOM: Option<u32> = Some(5);
 pub const COL_NODE_INFO: Option<u32> = Some(6);
 /// Column for the light client chain.
 pub const COL_LIGHT_CHAIN: Option<u32> = Some(7);
+/// Column for the private transactions state.
+pub const COL_PRIVATE_TRANSACTIONS_STATE: Option<u32> = Some(8);
 /// Number of columns in DB
-pub const NUM_COLUMNS: Option<u32> = Some(8);
+pub const NUM_COLUMNS: Option<u32> = Some(9);
 
 /// Modes for updating caches.
 #[derive(Clone, Copy)]

ethcore/private-tx/Cargo.toml

@@ -14,6 +14,7 @@ ethabi = "8.0"
 ethabi-contract = "8.0"
 ethabi-derive = "8.0"
 ethcore = { path = ".." }
+ethcore-db = { path = "../db" }
 ethcore-call-contract = { path = "../call-contract" }
 ethcore-io = { path = "../../util/io" }
 ethcore-miner = { path = "../../miner" }
@@ -23,9 +24,13 @@ ethkey = { path = "../../accounts/ethkey" }
 fetch = { path = "../../util/fetch" }
 futures = "0.1"
 parity-util-mem = "0.2.0"
+hash-db = "0.15.0"
 keccak-hash = "0.2.0"
+keccak-hasher = { path = "../../util/keccak-hasher" }
+kvdb = "0.1"
 log = "0.4"
 machine = { path = "../machine" }
+journaldb = { path = "../../util/journaldb" }
 parity-bytes = "0.1"
 parity-crypto = "0.4.0"
 parking_lot = "0.8"

ethcore/private-tx/src/error.rs

@@ -99,6 +99,12 @@ pub enum Error {
 	/// Account for signing requests to key server not set.
 	#[display(fmt = "Account for signing requests to key server not set.")]
 	KeyServerAccountNotSet,
+	/// Private state for the contract was not found in the local storage.
+	#[display(fmt = "Private state for the contract was not found in the local storage.")]
+	PrivateStateNotFound,
+	/// Cannot write state to the local database.
+	#[display(fmt = "Cannot write state to the local database.")]
+	DatabaseWriteError,
 	/// Encryption key is not found on key server.
 	#[display(fmt = "Encryption key is not found on key server for {}", _0)]
 	EncryptionKeyNotFound(Address),