Encapsulate access to the client for secret store (#11232)

* Move all client usages into trusted_client

* Move confirmed hash method to trusted client

* Tree route and logs encapsuluted

* Remove not used method for keys sharing

* NodeKeyPair renamed and moved to trusted client

* Use public key error in trusted client

* Move contract address definition into trusted client

* Block id and number types from ethcore wrapped

* Trusted client renamed to more general Blockchain

* Trusted client implementation moved to parity code

* Move node key pair under secret store feature as well

* Registar crate removed from deps

* Accounts feature removed from secret store

* Fix after merge

* Blockchain renamed to SecretStoreChain

* Module documentations added

Cargo.lock

@@ -1477,16 +1477,10 @@ name = "ethcore-secretstore"
 version = "1.0.0"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "client-traits 0.1.0",
- "common-types 0.1.0",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi 9.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi-contract 9.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi-derive 9.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethcore 1.12.0",
- "ethcore-accounts 0.1.0",
- "ethcore-call-contract 0.1.0",
- "ethcore-sync 1.12.0",
  "ethereum-types 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.4.0",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1502,7 +1496,6 @@ dependencies = [
  "parity-runtime 0.1.0",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "registrar 0.0.1",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3085,9 +3078,11 @@ dependencies = [
  "dir 0.1.2",
  "docopt 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "engine 0.1.0",
+ "ethabi 9.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 1.12.0",
  "ethcore-accounts 0.1.0",
  "ethcore-blockchain 0.1.0",
+ "ethcore-call-contract 0.1.0",
  "ethcore-db 0.1.0",
  "ethcore-io 1.12.0",
  "ethcore-light 1.12.0",

Cargo.toml

@@ -18,9 +18,11 @@ ctrlc = { git = "https://github.com/paritytech/rust-ctrlc.git" }
 dir = { path = "util/dir" }
 docopt = "1.0"
 engine = { path = "ethcore/engine" }
+ethabi = { version = "9.0.1", optional = true }
 ethcore = { path = "ethcore", features = ["parity"] }
 ethcore-accounts = { path = "accounts", optional = true }
 ethcore-blockchain = { path = "ethcore/blockchain" }
+ethcore-call-contract = { path = "ethcore/call-contract", optional = true }
 ethcore-db = { path = "ethcore/db" }
 ethcore-io = { path = "util/io" }
 ethcore-light = { path = "ethcore/light" }
@@ -97,7 +99,7 @@ test-heavy = ["ethcore/test-heavy"]
 evm-debug = ["ethcore/evm-debug"]
 evm-debug-tests = ["ethcore/evm-debug-tests"]
 slow-blocks = ["ethcore/slow-blocks"]
-secretstore = ["ethcore-secretstore", "ethcore-secretstore/accounts"]
+secretstore = ["ethcore-secretstore", "accounts", "ethabi", "ethcore-call-contract"]
 final = ["parity-version/final"]
 deadlock_detection = ["parking_lot/deadlock_detection"]
 # to create a memory profile (requires nightly rust), use e.g.

parity/lib.rs

@@ -86,6 +86,12 @@ extern crate ethcore_accounts as accounts;
 #[cfg(feature = "secretstore")]
 extern crate ethcore_secretstore;
 
+#[cfg(feature = "secretstore")]
+extern crate ethabi;
+
+#[cfg(feature = "secretstore")]
+extern crate ethcore_call_contract as call_contract;
+
 #[cfg(test)]
 #[macro_use]
 extern crate pretty_assertions;

parity/secretstore/blockchain.rs

@@ -0,0 +1,246 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! SecretStoreChain implementation with information about blockchain, retrieved from the client
+
+use std::sync::{Arc, Weak};
+use ethereum_types::{H256, Address};
+use parking_lot::RwLock;
+use types::{
+	ids::BlockId as EthcoreBlockId,
+	transaction::{Transaction, SignedTransaction, Action},
+	chain_notify::NewBlocks,
+	tree_route::TreeRoute,
+	filter::Filter as BlockchainFilter,
+	log_entry::LocalizedLogEntry,
+};
+use ethcore::client::Client;
+use bytes::Bytes;
+use ethabi::RawLog;
+use client_traits::BlockChainClient;
+use call_contract::CallContract;
+use client_traits::{ChainInfo, Nonce, ChainNotify};
+use ethcore::miner::{Miner, MinerService};
+use parity_crypto::publickey::Error as EthKeyError;
+use sync::SyncProvider;
+use registrar::RegistrarClient;
+use ethcore_secretstore::{BlockId, BlockNumber, SecretStoreChain, NewBlocksNotify, SigningKeyPair, ContractAddress, Filter};
+
+// TODO: Instead of a constant, make this based on consensus finality.
+/// Number of confirmations required before request can be processed.
+const REQUEST_CONFIRMATIONS_REQUIRED: u64 = 3;
+
+fn into_ethcore_block_id(id: BlockId) -> EthcoreBlockId {
+	match id {
+		BlockId::Hash(hash) => EthcoreBlockId::Hash(hash),
+		BlockId::Number(number) => EthcoreBlockId::Number(number),
+		BlockId::Earliest => EthcoreBlockId::Earliest,
+		BlockId::Latest => EthcoreBlockId::Latest,
+	}
+}
+
+/// SecretStore blockchain implementation (client's wrapper)
+/// This implementation is trusted, when underlying client is synced and chain's security level is full
+/// This trust is guaranteed by return result in get_trusted method (if it's not trusted, None is returned)
+pub struct TrustedClient {
+	/// This key server node key pair.
+	self_key_pair: Arc<dyn SigningKeyPair>,
+	/// Blockchain client.
+	client: Weak<Client>,
+	/// Sync provider.
+	sync: Weak<dyn SyncProvider>,
+	/// Miner service.
+	miner: Weak<Miner>,
+	/// Chain new blocks listeners
+	listeners: RwLock<Vec<Weak<dyn NewBlocksNotify>>>,
+}
+
+impl TrustedClient {
+	/// Create new trusted client.
+	pub fn new(self_key_pair: Arc<dyn SigningKeyPair>, client: Arc<Client>, sync: Arc<dyn SyncProvider>, miner: Arc<Miner>) -> Arc<Self> {
+		let trusted_client = Arc::new(TrustedClient {
+			self_key_pair,
+			client: Arc::downgrade(&client),
+			sync: Arc::downgrade(&sync),
+			miner: Arc::downgrade(&miner),
+			listeners: RwLock::default(),
+		});
+		client.add_notify(trusted_client.clone());
+		trusted_client
+	}
+
+	fn notify_listeners(&self, new_enacted_len: usize) {
+		for listener_pointer in self.listeners.read().iter() {
+			if let Some(listener) = listener_pointer.upgrade() {
+				listener.new_blocks(new_enacted_len);
+			}
+		}
+	}
+
+	/// Get 'trusted' `Client` reference only if it is synchronized && trusted.
+	fn get_trusted(&self) -> Option<Arc<Client>> {
+		self.client.upgrade()
+			.and_then(|client| self.sync.upgrade().map(|sync| (client, sync)))
+			.and_then(|(client, sync)| {
+				let is_synced = !sync.is_major_syncing();
+				let is_trusted = client.chain_info().security_level().is_full();
+				match is_synced && is_trusted {
+					true => Some(client),
+					false => None,
+				}
+			})
+	}
+
+	fn tree_route(&self, from: &H256, to: &H256) -> Option<TreeRoute> {
+		if let Some(client) = self.get_trusted() {
+			client.tree_route(from, to)
+		} else {
+			None
+		}
+	}
+
+	fn logs(&self, filter: BlockchainFilter) -> Option<Vec<LocalizedLogEntry>> {
+		if let Some(client) = self.get_trusted() {
+			client.logs(filter).ok()
+		} else {
+			None
+		}
+	}
+
+}
+
+impl SecretStoreChain for TrustedClient {
+	fn add_listener(&self, target: Arc<dyn NewBlocksNotify>) {
+		self.listeners.write().push(Arc::downgrade(&target));
+	}
+
+	fn is_trusted(&self) -> bool {
+		self.get_trusted().is_some()
+	}
+
+	fn transact_contract(&self, contract: Address, tx_data: Bytes) -> Result<(), EthKeyError> {
+		let client = self.client.upgrade().ok_or_else(|| EthKeyError::Custom("cannot submit tx when client is offline".into()))?;
+		let miner = self.miner.upgrade().ok_or_else(|| EthKeyError::Custom("cannot submit tx when miner is offline".into()))?;
+		let engine = client.engine();
+		let transaction = Transaction {
+			nonce: client.latest_nonce(&self.self_key_pair.address()),
+			action: Action::Call(contract),
+			gas: miner.authoring_params().gas_range_target.0,
+			gas_price: miner.sensible_gas_price(),
+			value: Default::default(),
+			data: tx_data,
+		};
+		let chain_id = engine.signing_chain_id(&client.latest_env_info());
+		let signature = self.self_key_pair.sign(&transaction.hash(chain_id))?;
+		let signed = SignedTransaction::new(transaction.with_signature(signature, chain_id))?;
+		miner.import_own_transaction(&*client, signed.into())
+			.map_err(|e| EthKeyError::Custom(format!("failed to import tx: {}", e)))
+	}
+
+	fn read_contract_address(
+		&self,
+		registry_name: &str,
+		address: &ContractAddress
+	) -> Option<Address> {
+		match *address {
+			ContractAddress::Address(ref address) => Some(address.clone()),
+			ContractAddress::Registry => self.get_trusted().and_then(|client|
+				self.get_confirmed_block_hash()
+					.and_then(|block| {
+						client.get_address(registry_name, EthcoreBlockId::Hash(block))
+							.unwrap_or(None)
+					})
+			),
+		}
+	}
+
+	fn call_contract(&self, block_id: BlockId, contract_address: Address, data: Bytes) -> Result<Bytes, String> {
+		if let Some(client) = self.get_trusted() {
+			client.call_contract(into_ethcore_block_id(block_id), contract_address, data)
+		} else {
+			Err("Calling ACL contract without trusted blockchain client".into())
+		}
+	}
+
+	fn block_hash(&self, id: BlockId) -> Option<H256> {
+		if let Some(client) = self.get_trusted() {
+			client.block_hash(into_ethcore_block_id(id))
+		} else {
+			None
+		}
+	}
+
+	fn block_number(&self, id: BlockId) -> Option<BlockNumber> {
+		if let Some(client) = self.get_trusted() {
+			client.block_number(into_ethcore_block_id(id))
+		} else {
+			None
+		}
+	}
+
+	fn retrieve_last_logs(&self, filter: Filter) -> Option<Vec<RawLog>> {
+		let confirmed_block = match self.get_confirmed_block_hash() {
+			Some(confirmed_block) => confirmed_block,
+			None => return None, // no block with enough confirmations
+		};
+
+		let from_block = self.block_hash(filter.from_block).unwrap_or_else(|| confirmed_block);
+		let first_block = match self.tree_route(&from_block, &confirmed_block) {
+			// if we have a route from last_log_block to confirmed_block => search for logs on this route
+			//
+			// potentially this could lead us to reading same logs twice when reorganizing to the fork, which
+			// already has been canonical previosuly
+			// the worst thing that can happen in this case is spending some time reading unneeded data from SS db
+			Some(ref route) if route.index < route.blocks.len() => route.blocks[route.index],
+			// else we care only about confirmed block
+			_ => confirmed_block.clone(),
+		};
+
+		self.logs(BlockchainFilter {
+			from_block: EthcoreBlockId::Hash(first_block),
+			to_block: EthcoreBlockId::Hash(confirmed_block),
+			address: filter.address,
+			topics: filter.topics,
+			limit: None,
+		})
+		.map(|blockchain_logs| {
+			blockchain_logs
+				.into_iter()
+					.map(|log| {
+						let raw_log: RawLog = (log.entry.topics.into_iter().map(|t| t.0.into()).collect(), log.entry.data).into();
+						raw_log
+					})
+				.collect::<Vec<_>>()
+		})
+	}
+
+	fn get_confirmed_block_hash(&self) -> Option<H256> {
+		self.block_number(BlockId::Latest)
+			.map(|b| b.saturating_sub(REQUEST_CONFIRMATIONS_REQUIRED))
+			.and_then(|b| self.block_hash(BlockId::Number(b)))
+	}
+}
+
+impl ChainNotify for TrustedClient {
+	fn new_blocks(&self, new_blocks: NewBlocks) {
+		if new_blocks.has_more_blocks_to_import { return }
+		if !new_blocks.route.enacted().is_empty() || !new_blocks.route.retracted().is_empty() {
+			let enacted_len = new_blocks.route.enacted().len();
+			self.notify_listeners(enacted_len);
+		}
+	}
+}
+

parity/secretstore/mod.rs

@@ -14,18 +14,18 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-use ethcore::client::Client;
-use client_traits::BlockChainClient;
-use common_types::ids::BlockId;
-use ethereum_types::H256;
+//! Secret store related components.
 
-// TODO: Instead of a constant, make this based on consensus finality.
-/// Number of confirmations required before request can be processed.
-pub const REQUEST_CONFIRMATIONS_REQUIRED: u64 = 3;
+mod server;
 
-/// Get hash of the last block with at least n confirmations.
-pub fn get_confirmed_block_hash(client: &Client, confirmations: u64) -> Option<H256> {
-	client.block_number(BlockId::Latest)
-		.map(|b| b.saturating_sub(confirmations))
-		.and_then(|b| client.block_hash(BlockId::Number(b)))
-}
+#[cfg(feature = "secretstore")]
+mod blockchain;
+
+#[cfg(all(feature = "accounts", feature = "secretstore"))]
+mod nodekeypair;
+
+pub use self::server::{Configuration, NodeSecretKey, ContractAddress, Dependencies, start};
+#[cfg(feature = "secretstore")]
+use self::blockchain::TrustedClient;
+#[cfg(all(feature = "accounts", feature = "secretstore"))]
+use self::nodekeypair::KeyStoreNodeKeyPair;

parity/secretstore/nodekeypair.rs

@@ -0,0 +1,59 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Key pair with signing ability
+
+use std::sync::Arc;
+use accounts::AccountProvider;
+use ethkey::Password;
+use parity_crypto::publickey::public_to_address;
+use ethereum_types::{H256, Address, Public};
+use parity_crypto::publickey::{Signature, Error as EthKeyError};
+use ethcore_secretstore::SigningKeyPair;
+
+pub struct KeyStoreNodeKeyPair {
+	account_provider: Arc<AccountProvider>,
+	address: Address,
+	public: Public,
+	password: Password,
+}
+
+impl KeyStoreNodeKeyPair {
+	pub fn new(account_provider: Arc<AccountProvider>, address: Address, password: Password) -> Result<Self, EthKeyError> {
+		let public = account_provider.account_public(address.clone(), &password).map_err(|e| EthKeyError::Custom(format!("{}", e)))?;
+		Ok(KeyStoreNodeKeyPair {
+			account_provider,
+			address,
+			public,
+			password,
+		})
+	}
+}
+
+impl SigningKeyPair for KeyStoreNodeKeyPair {
+	fn public(&self) -> &Public {
+		&self.public
+	}
+
+	fn address(&self) -> Address {
+		public_to_address(&self.public)
+	}
+
+	fn sign(&self, data: &H256) -> Result<Signature, EthKeyError> {
+		self.account_provider.sign(self.address.clone(), Some(self.password.clone()), data.clone())
+			.map_err(|e| EthKeyError::Custom(format!("{}", e)))
+	}
+}

parity/secretstore/server.rs

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+//! Secret store server's launcher, contains required configuration parameters and launch method
+
 use std::collections::BTreeMap;
 use std::sync::Arc;
 use account_utils::AccountProvider;
@@ -125,6 +127,9 @@ mod server {
 	use parity_crypto::publickey::KeyPair;
 	use ansi_term::Colour::{Red, White};
 	use super::{Configuration, Dependencies, NodeSecretKey, ContractAddress, Executor};
+	use super::super::TrustedClient;
+	#[cfg(feature = "accounts")]
+	use super::super::KeyStoreNodeKeyPair;
 
 	fn into_service_contract_address(address: ContractAddress) -> ethcore_secretstore::ContractAddress {
 		match address {
@@ -141,7 +146,7 @@ mod server {
 	impl KeyServer {
 		/// Create new key server
 		pub fn new(mut conf: Configuration, deps: Dependencies, executor: Executor) -> Result<Self, String> {
-			let self_secret: Arc<dyn ethcore_secretstore::NodeKeyPair> = match conf.self_secret.take() {
+			let self_secret: Arc<dyn ethcore_secretstore::SigningKeyPair> = match conf.self_secret.take() {
 				Some(NodeSecretKey::Plain(secret)) => Arc::new(ethcore_secretstore::PlainNodeKeyPair::new(
 					KeyPair::from_secret(secret).map_err(|e| format!("invalid secret: {}", e))?)),
 				#[cfg(feature = "accounts")]
@@ -160,7 +165,7 @@ mod server {
 					let password = deps.accounts_passwords.iter()
 						.find(|p| deps.account_provider.sign(account.clone(), Some((*p).clone()), Default::default()).is_ok())
 						.ok_or_else(|| format!("No valid password for the secret store node account {}", account))?;
-					Arc::new(ethcore_secretstore::KeyStoreNodeKeyPair::new(deps.account_provider, account, password.clone())
+					Arc::new(KeyStoreNodeKeyPair::new(deps.account_provider, account, password.clone())
 						.map_err(|e| format!("{}", e))?)
 				},
 				None => return Err("self secret is required when using secretstore".into()),
@@ -203,7 +208,8 @@ mod server {
 			cconf.cluster_config.nodes.insert(self_secret.public().clone(), cconf.cluster_config.listener_address.clone());
 
 			let db = ethcore_secretstore::open_secretstore_db(&conf.data_path)?;
-			let key_server = ethcore_secretstore::start(deps.client, deps.sync, deps.miner, self_secret, cconf, db, executor)
+			let trusted_client = TrustedClient::new(self_secret.clone(), deps.client, deps.sync, deps.miner);
+			let key_server = ethcore_secretstore::start(trusted_client, self_secret, cconf, db, executor)
 				.map_err(|e| format!("Error starting KeyServer {}: {}", key_server_name, e))?;
 
 			Ok(KeyServer {

secret-store/Cargo.toml

@@ -7,15 +7,9 @@ authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
 byteorder = "1.0"
-client-traits = { path = "../ethcore/client-traits" }
-common-types = { path = "../ethcore/types" }
 ethabi = "9.0.1"
 ethabi-contract = "9.0.0"
 ethabi-derive = "9.0.1"
-ethcore = { path = "../ethcore" }
-ethcore-accounts = { path = "../accounts", optional = true}
-ethcore-call-contract = { path = "../ethcore/call-contract" }
-ethcore-sync = { path = "../ethcore/sync" }
 ethereum-types = "0.8.0"
 ethkey = { path = "../accounts/ethkey", optional = true }
 futures = "0.1"
@@ -30,7 +24,6 @@ parity-crypto = { version = "0.4.2", features = ["publickey"] }
 parity-runtime = { path = "../util/runtime" }
 parking_lot = "0.9"
 percent-encoding = "2.1.0"
-registrar = { path = "../util/registrar" }
 rustc-hex = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
@@ -44,10 +37,5 @@ jsonrpc-server-utils = "14.0.3"
 
 [dev-dependencies]
 env_logger = "0.5"
-ethkey = { path = "../accounts/ethkey" }
-ethcore = { path = "../ethcore", features = ["test-helpers"] }
 tempdir = "0.3"
 kvdb-rocksdb = "0.3.0"
-
-[features]
-accounts = ["ethcore-accounts", "ethkey"]

secret-store/src/acl_storage.rs

@@ -16,17 +16,11 @@
 
 use std::sync::Arc;
 use std::collections::{HashMap, HashSet};
-use common_types::{
-	chain_notify::NewBlocks,
-	ids::BlockId
-};
 use parking_lot::{Mutex, RwLock};
-use call_contract::CallContract;
-use client_traits::ChainNotify;
 use ethereum_types::Address;
 use ethabi::FunctionOutputDecoder;
-use trusted_client::TrustedClient;
-use types::{Error, ServerKeyId, ContractAddress};
+use blockchain::{SecretStoreChain, NewBlocksNotify, ContractAddress, BlockId};
+use types::{Error, ServerKeyId};
 
 use_contract!(acl_storage, "res/acl_storage.json");
 
@@ -47,7 +41,7 @@ pub struct OnChainAclStorage {
 /// Cached on-chain ACL storage contract.
 struct CachedContract {
 	/// Blockchain client.
-	client: TrustedClient,
+	client: Arc<dyn SecretStoreChain>,
 	/// Contract address source.
 	address_source: ContractAddress,
 	/// Current contract address.
@@ -61,14 +55,11 @@ pub struct DummyAclStorage {
 }
 
 impl OnChainAclStorage {
-	pub fn new(trusted_client: TrustedClient, address_source: ContractAddress) -> Result<Arc<Self>, Error> {
-		let client = trusted_client.get_untrusted();
+	pub fn new(trusted_client: Arc<dyn SecretStoreChain>, address_source: ContractAddress) -> Result<Arc<Self>, Error> {
 		let acl_storage = Arc::new(OnChainAclStorage {
-			contract: Mutex::new(CachedContract::new(trusted_client, address_source)),
+			contract: Mutex::new(CachedContract::new(trusted_client.clone(), address_source)),
 		});
-		client
-			.ok_or_else(|| Error::Internal("Constructing OnChainAclStorage without active Client".into()))?
-			.add_notify(acl_storage.clone());
+		trusted_client.add_listener(acl_storage.clone());
 		Ok(acl_storage)
 	}
 }
@@ -79,17 +70,14 @@ impl AclStorage for OnChainAclStorage {
 	}
 }
 
-impl ChainNotify for OnChainAclStorage {
-	fn new_blocks(&self, new_blocks: NewBlocks) {
-		if new_blocks.has_more_blocks_to_import { return }
-		if !new_blocks.route.enacted().is_empty() || !new_blocks.route.retracted().is_empty() {
-			self.contract.lock().update_contract_address()
-		}
+impl NewBlocksNotify for OnChainAclStorage {
+	fn new_blocks(&self, _new_enacted_len: usize) {
+		self.contract.lock().update_contract_address()
 	}
 }
 
 impl CachedContract {
-	pub fn new(client: TrustedClient, address_source: ContractAddress) -> Self {
+	pub fn new(client: Arc<dyn SecretStoreChain>, address_source: ContractAddress) -> Self {
 		let mut contract = CachedContract {
 			client,
 			address_source,
@@ -113,12 +101,12 @@ impl CachedContract {
 	}
 
 	pub fn check(&mut self, requester: Address, document: &ServerKeyId) -> Result<bool, Error> {
-		if let Some(client) = self.client.get() {
+		if self.client.is_trusted() {
 			// call contract to check accesss
 			match self.contract_address {
 				Some(contract_address) => {
 					let (encoded, decoder) = acl_storage::functions::check_permissions::call(requester, document.clone());
-					let d = client.call_contract(BlockId::Latest, contract_address, encoded)
+					let d = self.client.call_contract(BlockId::Latest, contract_address, encoded)
 						.map_err(|e| Error::Internal(format!("ACL checker call error: {}", e.to_string())))?;
 					decoder.decode(&d)
 						.map_err(|e| Error::Internal(format!("ACL checker call error: {}", e.to_string())))

secret-store/src/blockchain.rs

@@ -0,0 +1,119 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+use std::sync::Arc;
+use bytes::Bytes;
+use ethereum_types::{H256, Address, Public};
+use ethabi::RawLog;
+use crypto::publickey::{Signature, Error as EthKeyError};
+
+/// Type for block number.
+/// Duplicated from ethcore types
+pub type BlockNumber = u64;
+
+/// Uniquely identifies block.
+/// Duplicated from ethcore types
+#[derive(Debug, PartialEq, Copy, Clone, Hash, Eq)]
+pub enum BlockId {
+	/// Block's sha3.
+	/// Querying by hash is always faster.
+	Hash(H256),
+	/// Block number within canon blockchain.
+	Number(BlockNumber),
+	/// Earliest block (genesis).
+	Earliest,
+	/// Latest mined block.
+	Latest,
+}
+
+/// Contract address.
+#[derive(Debug, Clone)]
+pub enum ContractAddress {
+	/// Address is read from registry.
+	Registry,
+	/// Address is specified.
+	Address(ethereum_types::Address),
+}
+
+/// Key pair with signing ability.
+pub trait SigningKeyPair: Send + Sync {
+	/// Public portion of key.
+	fn public(&self) -> &Public;
+	/// Address of key owner.
+	fn address(&self) -> Address;
+	/// Sign data with the key.
+	fn sign(&self, data: &H256) -> Result<Signature, EthKeyError>;
+}
+
+/// Wrapps client ChainNotify in order to send signal about new blocks
+pub trait NewBlocksNotify: Send + Sync {
+	/// Fires when chain has new blocks.
+	/// Sends this signal only, if contracts' update required
+	fn new_blocks(&self, _new_enacted_len: usize) {
+		// does nothing by default
+	}
+}
+
+/// Blockchain logs Filter.
+#[derive(Debug, PartialEq)]
+pub struct Filter {
+	/// Blockchain will be searched from this block.
+	pub from_block: BlockId,
+
+	/// Search addresses.
+	///
+	/// If None, match all.
+	/// If specified, log must be produced by one of these addresses.
+	pub address: Option<Vec<Address>>,
+
+	/// Search topics.
+	///
+	/// If None, match all.
+	/// If specified, log must contain one of these topics.
+	pub topics: Vec<Option<Vec<H256>>>,
+}
+
+/// Blockchain representation for Secret Store
+pub trait SecretStoreChain: Send + Sync + 'static {
+	/// Adds listener for chain's NewBlocks event
+	fn add_listener(&self, target: Arc<dyn NewBlocksNotify>);
+
+	/// Check if the underlying chain is in the trusted state
+	fn is_trusted(&self) -> bool;
+
+	/// Transact contract.
+	fn transact_contract(&self, contract: Address, tx_data: Bytes) -> Result<(), EthKeyError>;
+
+	/// Read contract address. If address source is registry, address only returned if current client state is
+	/// trusted. Address from registry is read from registry from block latest block with
+	/// REQUEST_CONFIRMATIONS_REQUIRED confirmations.
+	fn read_contract_address(&self, registry_name: &str, address: &ContractAddress) -> Option<Address>;
+
+	/// Call contract in the blockchain
+	fn call_contract(&self, block_id: BlockId, contract_address: Address, data: Bytes) -> Result<Bytes, String>;
+
+	/// Returns blockhash for block id
+	fn block_hash(&self, id: BlockId) -> Option<H256>;
+
+	/// Returns block number for block id
+	fn block_number(&self, id: BlockId) -> Option<BlockNumber>;
+
+	/// Retrieve last blockchain logs for the filter
+	fn retrieve_last_logs(&self, filter: Filter) -> Option<Vec<RawLog>>;
+
+	/// Get hash of the last block with predefined number of confirmations (depends on the chain).
+	fn get_confirmed_block_hash(&self) -> Option<H256>;
+}

secret-store/src/key_server.rs

@@ -24,8 +24,9 @@ use parity_runtime::Executor;
 use super::acl_storage::AclStorage;
 use super::key_storage::KeyStorage;
 use super::key_server_set::KeyServerSet;
+use blockchain::SigningKeyPair;
 use key_server_cluster::{math, new_network_cluster, ClusterSession, WaitableSession};
-use traits::{AdminSessionsServer, ServerKeyGenerator, DocumentKeyServer, MessageSigner, KeyServer, NodeKeyPair};
+use traits::{AdminSessionsServer, ServerKeyGenerator, DocumentKeyServer, MessageSigner, KeyServer};
 use types::{Error, Public, RequestSignature, Requester, ServerKeyId, EncryptedDocumentKey, EncryptedDocumentKeyShadow,
 	ClusterConfiguration, MessageHash, EncryptedMessageSignature, NodeId};
 use key_server_cluster::{ClusterClient, ClusterConfiguration as NetClusterConfiguration, NetConnectionsManagerConfig};
@@ -42,7 +43,7 @@ pub struct KeyServerCore {
 
 impl KeyServerImpl {
 	/// Create new key server instance
-	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>,
+	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn SigningKeyPair>,
 		acl_storage: Arc<dyn AclStorage>, key_storage: Arc<dyn KeyStorage>, executor: Executor) -> Result<Self, Error>
 	{
 		Ok(KeyServerImpl {
@@ -269,7 +270,7 @@ impl MessageSigner for KeyServerImpl {
 }
 
 impl KeyServerCore {
-	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>,
+	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn SigningKeyPair>,
 		acl_storage: Arc<dyn AclStorage>, key_storage: Arc<dyn KeyStorage>, executor: Executor) -> Result<Self, Error>
 	{
 		let cconfig = NetClusterConfiguration {

secret-store/src/key_server_cluster/admin_sessions/servers_set_change_session.rs

@@ -1051,7 +1051,8 @@ pub mod tests {
 	use std::collections::{VecDeque, BTreeMap, BTreeSet};
 	use ethereum_types::H256;
 	use crypto::publickey::{Random, Generator, Public, Signature, KeyPair, sign};
-	use key_server_cluster::{NodeId, SessionId, Error, KeyStorage, NodeKeyPair, PlainNodeKeyPair};
+	use blockchain::SigningKeyPair;
+	use key_server_cluster::{NodeId, SessionId, Error, KeyStorage, PlainNodeKeyPair};
 	use key_server_cluster::cluster_sessions::ClusterSession;
 	use key_server_cluster::cluster::tests::MessageLoop as ClusterMessageLoop;
 	use key_server_cluster::generation_session::tests::{MessageLoop as GenerationMessageLoop};

secret-store/src/key_server_cluster/admin_sessions/share_add_session.rs

@@ -889,7 +889,8 @@ impl SessionTransport for IsolatedSessionTransport {
 pub mod tests {
 	use std::collections::BTreeSet;
 	use crypto::publickey::{Random, Generator, Public};
-	use key_server_cluster::{NodeId, Error, KeyStorage, NodeKeyPair};
+	use blockchain::SigningKeyPair;
+	use key_server_cluster::{NodeId, Error, KeyStorage};
 	use key_server_cluster::cluster::tests::MessageLoop as ClusterMessageLoop;
 	use key_server_cluster::servers_set_change_session::tests::{MessageLoop, AdminSessionAdapter, generate_key};
 	use key_server_cluster::admin_sessions::ShareChangeSessionMeta;

secret-store/src/key_server_cluster/cluster.rs

@@ -20,7 +20,8 @@ use parking_lot::RwLock;
 use crypto::publickey::{Public, Signature, Random, Generator};
 use ethereum_types::{Address, H256};
 use parity_runtime::Executor;
-use key_server_cluster::{Error, NodeId, SessionId, Requester, AclStorage, KeyStorage, KeyServerSet, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{Error, NodeId, SessionId, Requester, AclStorage, KeyStorage, KeyServerSet};
 use key_server_cluster::cluster_sessions::{WaitableSession, ClusterSession, AdminSession, ClusterSessions,
 	SessionIdWithSubSession, ClusterSessionsContainer, SERVERS_SET_CHANGE_SESSION_ID, create_cluster_view,
 	AdminSessionCreationData, ClusterSessionsListener};
@@ -143,7 +144,7 @@ pub trait Cluster: Send + Sync {
 #[derive(Clone)]
 pub struct ClusterConfiguration {
 	/// KeyPair this node holds.
-	pub self_key_pair: Arc<dyn NodeKeyPair>,
+	pub self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Cluster nodes set.
 	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// Reference to key storage
@@ -173,7 +174,7 @@ pub struct ClusterView {
 	configured_nodes_count: usize,
 	connected_nodes: BTreeSet<NodeId>,
 	connections: Arc<dyn ConnectionProvider>,
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 }
 
 /// Cross-thread shareable cluster data.
@@ -181,7 +182,7 @@ pub struct ClusterData<C: ConnectionManager> {
 	/// Cluster configuration.
 	pub config: ClusterConfiguration,
 	/// KeyPair this node holds.
-	pub self_key_pair: Arc<dyn NodeKeyPair>,
+	pub self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Connections data.
 	pub connections: C,
 	/// Active sessions data.
@@ -311,7 +312,7 @@ impl<C: ConnectionManager> ClusterCore<C> {
 
 impl ClusterView {
 	pub fn new(
-		self_key_pair: Arc<dyn NodeKeyPair>,
+		self_key_pair: Arc<dyn SigningKeyPair>,
 		connections: Arc<dyn ConnectionProvider>,
 		nodes: BTreeSet<NodeId>,
 		configured_nodes_count: usize
@@ -597,7 +598,7 @@ pub struct ServersSetChangeParams {
 }
 
 pub fn new_servers_set_change_session(
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	sessions: &ClusterSessions,
 	connections: Arc<dyn ConnectionProvider>,
 	servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
@@ -656,8 +657,9 @@ pub mod tests {
 	use parking_lot::{Mutex, RwLock};
 	use ethereum_types::{Address, H256};
 	use crypto::publickey::{Random, Generator, Public, Signature, sign};
+	use blockchain::SigningKeyPair;
 	use key_server_cluster::{NodeId, SessionId, Requester, Error, DummyAclStorage, DummyKeyStorage,
-		MapKeyServerSet, PlainNodeKeyPair, NodeKeyPair};
+		MapKeyServerSet, PlainNodeKeyPair};
 	use key_server_cluster::message::Message;
 	use key_server_cluster::cluster::{new_test_cluster, Cluster, ClusterCore, ClusterConfiguration, ClusterClient};
 	use key_server_cluster::cluster_connections::ConnectionManager;

secret-store/src/key_server_cluster/cluster_connections_net.rs

@@ -27,7 +27,8 @@ use tokio::timer::{Interval, timeout::Error as TimeoutError};
 use tokio_io::IoFuture;
 use crypto::publickey::KeyPair;
 use parity_runtime::Executor;
-use key_server_cluster::{Error, NodeId, ClusterConfiguration, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{Error, NodeId, ClusterConfiguration};
 use key_server_cluster::cluster_connections::{ConnectionProvider, Connection, ConnectionManager};
 use key_server_cluster::connection_trigger::{Maintain, ConnectionTrigger};
 use key_server_cluster::cluster_message_processor::MessageProcessor;
@@ -79,7 +80,7 @@ struct NetConnectionsData {
 	/// Reference to tokio task executor.
 	executor: Executor,
 	/// Key pair of this node.
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Network messages processor.
 	message_processor: Arc<dyn MessageProcessor>,
 	/// Connections trigger.

secret-store/src/key_server_cluster/cluster_message_processor.rs

@@ -15,7 +15,8 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::sync::Arc;
-use key_server_cluster::{Error, NodeId, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{Error, NodeId};
 use key_server_cluster::cluster::{ServersSetChangeParams, new_servers_set_change_session};
 use key_server_cluster::cluster_sessions::{AdminSession};
 use key_server_cluster::cluster_connections::{ConnectionProvider, Connection};
@@ -49,7 +50,7 @@ pub trait MessageProcessor: Send + Sync {
 
 /// Bridge between ConnectionManager and ClusterSessions.
 pub struct SessionsMessageProcessor {
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 	sessions: Arc<ClusterSessions>,
 	connections: Arc<dyn ConnectionProvider>,
@@ -58,7 +59,7 @@ pub struct SessionsMessageProcessor {
 impl SessionsMessageProcessor {
 	/// Create new instance of SessionsMessageProcessor.
 	pub fn new(
-		self_key_pair: Arc<dyn NodeKeyPair>,
+		self_key_pair: Arc<dyn SigningKeyPair>,
 		servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 		sessions: Arc<ClusterSessions>,
 		connections: Arc<dyn ConnectionProvider>,

secret-store/src/key_server_cluster/cluster_sessions.rs

@@ -22,7 +22,8 @@ use futures::{oneshot, Oneshot, Complete, Future};
 use parking_lot::{Mutex, RwLock, Condvar};
 use ethereum_types::H256;
 use crypto::publickey::Secret;
-use key_server_cluster::{Error, NodeId, SessionId, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{Error, NodeId, SessionId};
 use key_server_cluster::cluster::{Cluster, ClusterConfiguration, ClusterView};
 use key_server_cluster::cluster_connections::ConnectionProvider;
 use key_server_cluster::connection_trigger::ServersSetChangeSessionCreatorConnector;
@@ -647,7 +648,7 @@ impl<T> CompletionSignal<T> {
 	}
 }
 
-pub fn create_cluster_view(self_key_pair: Arc<dyn NodeKeyPair>, connections: Arc<dyn ConnectionProvider>, requires_all_connections: bool) -> Result<Arc<dyn Cluster>, Error> {
+pub fn create_cluster_view(self_key_pair: Arc<dyn SigningKeyPair>, connections: Arc<dyn ConnectionProvider>, requires_all_connections: bool) -> Result<Arc<dyn Cluster>, Error> {
 	let mut connected_nodes = connections.connected_nodes()?;
 	let disconnected_nodes = connections.disconnected_nodes();
 

secret-store/src/key_server_cluster/connection_trigger.rs

@@ -26,7 +26,7 @@ use key_server_cluster::cluster_sessions::AdminSession;
 use key_server_cluster::cluster_connections::{Connection};
 use key_server_cluster::cluster_connections_net::{NetConnectionsContainer};
 use types::{Error, NodeId};
-use NodeKeyPair;
+use blockchain::SigningKeyPair;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
 /// Describes which maintain() call is required.
@@ -93,7 +93,7 @@ pub enum ConnectionsAction {
 /// Trigger connections.
 pub struct TriggerConnections {
 	/// This node key pair.
-	pub self_key_pair: Arc<dyn NodeKeyPair>,
+	pub self_key_pair: Arc<dyn SigningKeyPair>,
 }
 
 impl SimpleConnectionTrigger {
@@ -103,7 +103,7 @@ impl SimpleConnectionTrigger {
 	}
 
 	/// Create new simple connection trigger.
-	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>, admin_public: Option<Public>) -> Self {
+	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn SigningKeyPair>, admin_public: Option<Public>) -> Self {
 		SimpleConnectionTrigger {
 			key_server_set: key_server_set,
 			connections: TriggerConnections {

secret-store/src/key_server_cluster/connection_trigger_with_migration.rs

@@ -28,12 +28,12 @@ use key_server_cluster::jobs::servers_set_change_access_job::ordered_nodes_hash;
 use key_server_cluster::connection_trigger::{Maintain, ConnectionsAction, ConnectionTrigger,
 	ServersSetChangeSessionCreatorConnector, TriggerConnections};
 use types::{Error, NodeId};
-use {NodeKeyPair};
+use blockchain::SigningKeyPair;
 
 /// Key servers set change trigger with automated migration procedure.
 pub struct ConnectionTriggerWithMigration {
 	/// This node key pair.
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Key server set.
 	key_server_set: Arc<dyn KeyServerSet>,
 	/// Last server set state.
@@ -105,7 +105,7 @@ struct TriggerSession {
 	/// Servers set change session creator connector.
 	connector: Arc<ServersSetChangeSessionCreatorConnectorWithMigration>,
 	/// This node key pair.
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Key server set.
 	key_server_set: Arc<dyn KeyServerSet>,
 }
@@ -117,7 +117,7 @@ impl ConnectionTriggerWithMigration {
 	}
 
 	/// Create new trigge with migration.
-	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>) -> Self {
+	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn SigningKeyPair>) -> Self {
 		let snapshot = key_server_set.snapshot();
 		let migration = snapshot.migration.clone();
 

secret-store/src/key_server_cluster/io/handshake.rs

@@ -40,20 +40,21 @@ use tokio_io::{AsyncRead, AsyncWrite};
 use crypto::publickey::ecdh::agree;
 use crypto::publickey::{Random, Generator, KeyPair, Public, Signature, verify_public, sign, recover};
 use ethereum_types::H256;
-use key_server_cluster::{NodeId, Error, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{NodeId, Error};
 use key_server_cluster::message::{Message, ClusterMessage, NodePublicKey, NodePrivateKeySignature};
 use key_server_cluster::io::{write_message, write_encrypted_message, WriteMessage, ReadMessage,
 	read_message, read_encrypted_message, fix_shared_key};
 
 /// Start handshake procedure with another node from the cluster.
-pub fn handshake<A>(a: A, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn handshake<A>(a: A, self_key_pair: Arc<dyn SigningKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let init_data = Random.generate().map(|kp| *kp.secret().clone()).map_err(Into::into)
 		.and_then(|cp| Random.generate().map(|kp| (cp, kp)).map_err(Into::into));
 	handshake_with_init_data(a, init_data, self_key_pair, trusted_nodes)
 }
 
 /// Start handshake procedure with another node from the cluster and given plain confirmation + session key pair.
-pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Error>, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Error>, self_key_pair: Arc<dyn SigningKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let handshake_input_data = init_data
 		.and_then(|(cp, kp)| sign(kp.secret(), &cp).map(|sp| (cp, kp, sp)).map_err(Into::into))
 		.and_then(|(cp, kp, sp)| Handshake::<A>::make_public_key_message(self_key_pair.public().clone(), cp.clone(), sp).map(|msg| (cp, kp, msg)));
@@ -79,7 +80,7 @@ pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Erro
 }
 
 /// Wait for handshake procedure to be started by another node from the cluster.
-pub fn accept_handshake<A>(a: A, self_key_pair: Arc<dyn NodeKeyPair>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn accept_handshake<A>(a: A, self_key_pair: Arc<dyn SigningKeyPair>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let self_confirmation_plain = Random.generate().map(|kp| *kp.secret().clone()).map_err(Into::into);
 	let handshake_input_data = self_confirmation_plain
 		.and_then(|cp| Random.generate().map(|kp| (cp, kp)).map_err(Into::into));
@@ -118,7 +119,7 @@ pub struct Handshake<A> {
 	is_active: bool,
 	error: Option<(A, Result<HandshakeResult, Error>)>,
 	state: HandshakeState<A>,
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	self_session_key_pair: Option<KeyPair>,
 	self_confirmation_plain: H256,
 	trusted_nodes: Option<BTreeSet<NodeId>>,
@@ -156,7 +157,7 @@ impl<A> Handshake<A> where A: AsyncRead + AsyncWrite {
 		})))
 	}
 
-	fn make_private_key_signature_message(self_key_pair: &dyn NodeKeyPair, confirmation_plain: &H256) -> Result<Message, Error> {
+	fn make_private_key_signature_message(self_key_pair: &dyn SigningKeyPair, confirmation_plain: &H256) -> Result<Message, Error> {
 		Ok(Message::Cluster(ClusterMessage::NodePrivateKeySignature(NodePrivateKeySignature {
 			confirmation_signed: self_key_pair.sign(confirmation_plain)?.into(),
 		})))

secret-store/src/key_server_cluster/mod.rs

@@ -16,7 +16,7 @@
 
 use super::types::ServerKeyId;
 
-pub use super::traits::NodeKeyPair;
+pub use super::blockchain::SigningKeyPair;
 pub use super::types::{Error, NodeId, Requester, EncryptedDocumentKeyShadow};
 pub use super::acl_storage::AclStorage;
 pub use super::key_storage::{KeyStorage, DocumentKeyShare, DocumentKeyShareVersion};

secret-store/src/key_server_cluster/net/accept_connection.rs

@@ -20,12 +20,13 @@ use std::net::SocketAddr;
 use std::time::Duration;
 use futures::{Future, Poll};
 use tokio::net::TcpStream;
-use key_server_cluster::{Error, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::Error;
 use key_server_cluster::io::{accept_handshake, Handshake, Deadline, deadline};
 use key_server_cluster::net::Connection;
 
 /// Create future for accepting incoming connection.
-pub fn accept_connection(stream: TcpStream, self_key_pair: Arc<dyn NodeKeyPair>) -> Deadline<AcceptConnection> {
+pub fn accept_connection(stream: TcpStream, self_key_pair: Arc<dyn SigningKeyPair>) -> Deadline<AcceptConnection> {
 	// TODO: This could fail so it would be better either to accept the
 	// address as a separate argument or return a result.
 	let address = stream.peer_addr().expect("Unable to determine tcp peer address");

secret-store/src/key_server_cluster/net/connect.rs

@@ -21,12 +21,13 @@ use std::time::Duration;
 use std::net::SocketAddr;
 use futures::{Future, Poll, Async};
 use tokio::net::{TcpStream, tcp::ConnectFuture};
-use key_server_cluster::{Error, NodeId, NodeKeyPair};
+use blockchain::SigningKeyPair;
+use key_server_cluster::{Error, NodeId};
 use key_server_cluster::io::{handshake, Handshake, Deadline, deadline};
 use key_server_cluster::net::Connection;
 
 /// Create future for connecting to other node.
-pub fn connect(address: &SocketAddr, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Deadline<Connect> {
+pub fn connect(address: &SocketAddr, self_key_pair: Arc<dyn SigningKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Deadline<Connect> {
 	let connect = Connect {
 		state: ConnectState::TcpConnect(TcpStream::connect(address)),
 		address: address.clone(),
@@ -47,7 +48,7 @@ enum ConnectState {
 pub struct Connect {
 	state: ConnectState,
 	address: SocketAddr,
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	trusted_nodes: BTreeSet<NodeId>,
 }
 

secret-store/src/key_server_set.rs

@@ -18,20 +18,12 @@ use std::sync::Arc;
 use std::net::SocketAddr;
 use std::collections::{BTreeMap, HashSet};
 use parking_lot::Mutex;
-use call_contract::CallContract;
 use ethabi::FunctionOutputDecoder;
-use ethcore::client::Client;
-use client_traits::{BlockChainClient, ChainNotify};
-use common_types::{
-	chain_notify::NewBlocks,
-	ids::BlockId,
-};
 use ethereum_types::{H256, Address};
 use crypto::publickey::public_to_address;
 use bytes::Bytes;
 use types::{Error, Public, NodeAddress, NodeId};
-use trusted_client::TrustedClient;
-use {NodeKeyPair, ContractAddress};
+use blockchain::{SecretStoreChain, NewBlocksNotify, SigningKeyPair, ContractAddress, BlockId};
 
 use_contract!(key_server, "res/key_server_set.json");
 
@@ -105,7 +97,7 @@ struct PreviousMigrationTransaction {
 /// Cached on-chain Key Server set contract.
 struct CachedContract {
 	/// Blockchain client.
-	client: TrustedClient,
+	client: Arc<dyn SecretStoreChain>,
 	/// Contract address source.
 	contract_address_source: Option<ContractAddress>,
 	/// Current contract address.
@@ -121,18 +113,15 @@ struct CachedContract {
 	/// Previous confirm migration transaction.
 	confirm_migration_tx: Option<PreviousMigrationTransaction>,
 	/// This node key pair.
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 }
 
 impl OnChainKeyServerSet {
-	pub fn new(trusted_client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Arc<Self>, Error> {
-		let client = trusted_client.get_untrusted();
+	pub fn new(trusted_client: Arc<dyn SecretStoreChain>, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn SigningKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Arc<Self>, Error> {
 		let key_server_set = Arc::new(OnChainKeyServerSet {
-			contract: Mutex::new(CachedContract::new(trusted_client, contract_address_source, self_key_pair, auto_migrate_enabled, key_servers)?),
+			contract: Mutex::new(CachedContract::new(trusted_client.clone(), contract_address_source, self_key_pair, auto_migrate_enabled, key_servers)?),
 		});
-		client
-			.ok_or_else(|| Error::Internal("Constructing OnChainKeyServerSet without active Client".into()))?
-			.add_notify(key_server_set.clone());
+		trusted_client.add_listener(key_server_set.clone());
 		Ok(key_server_set)
 	}
 }
@@ -155,14 +144,9 @@ impl KeyServerSet for OnChainKeyServerSet {
 	}
 }
 
-impl ChainNotify for OnChainKeyServerSet {
-	fn new_blocks(&self, new_blocks: NewBlocks) {
-		if new_blocks.has_more_blocks_to_import { return }
-		let (enacted, retracted) = new_blocks.route.into_enacted_retracted();
-
-		if !enacted.is_empty() || !retracted.is_empty() {
-			self.contract.lock().update(enacted, retracted)
-		}
+impl NewBlocksNotify for OnChainKeyServerSet {
+	fn new_blocks(&self, _new_enacted_len: usize) {
+		self.contract.lock().update()
 	}
 }
 
@@ -232,7 +216,7 @@ impl <F: Fn(Vec<u8>) -> Result<Vec<u8>, String>> KeyServerSubset<F> for NewKeySe
 }
 
 impl CachedContract {
-	pub fn new(client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Self, Error> {
+	pub fn new(client: Arc<dyn SecretStoreChain>, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn SigningKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Self, Error> {
 		let server_set = match contract_address_source.is_none() {
 			true => key_servers.into_iter()
 				.map(|(p, addr)| {
@@ -279,21 +263,19 @@ impl CachedContract {
 		}
 	}
 
-	pub fn update(&mut self, enacted: Vec<H256>, retracted: Vec<H256>) {
+	pub fn update(&mut self) {
 		// no need to update when servers set is hardcoded
 		if self.contract_address_source.is_none() {
 			return;
 		}
 
-		if let Some(client) = self.client.get() {
-			// read new snapshot from reqistry (if something has chnaged)
-			if !enacted.is_empty() || !retracted.is_empty() {
-				self.update_contract_address();
-				self.read_from_registry(&*client);
-			}
+		if self.client.is_trusted() {
+			// read new snapshot from reqistry
+			self.update_contract_address();
+			self.read_from_registry();
 
 			// update number of confirmations (if there's future new set)
-			self.update_number_of_confirmations_if_required(&*client);
+			self.update_number_of_confirmations_if_required();
 		}
 	}
 
@@ -307,9 +289,9 @@ impl CachedContract {
 
 	fn start_migration(&mut self, migration_id: H256) {
 		// trust is not needed here, because it is the reaction to the read of the trusted client
-		if let (Some(client), Some(contract_address)) = (self.client.get_untrusted(), self.contract_address.as_ref()) {
+		if let Some(contract_address) = self.contract_address.as_ref() {
 			// check if we need to send start migration transaction
-			if !update_last_transaction_block(&*client, &migration_id, &mut self.start_migration_tx) {
+			if !update_last_transaction_block(&*self.client, &migration_id, &mut self.start_migration_tx) {
 				return;
 			}
 
@@ -328,9 +310,9 @@ impl CachedContract {
 
 	fn confirm_migration(&mut self, migration_id: H256) {
 		// trust is not needed here, because we have already completed the action
-		if let (Some(client), Some(contract_address)) = (self.client.get(), self.contract_address) {
+		if let (true, Some(contract_address)) = (self.client.is_trusted(), self.contract_address) {
 			// check if we need to send start migration transaction
-			if !update_last_transaction_block(&*client, &migration_id, &mut self.confirm_migration_tx) {
+			if !update_last_transaction_block(&*self.client, &migration_id, &mut self.confirm_migration_tx) {
 				return;
 			}
 
@@ -347,7 +329,7 @@ impl CachedContract {
 		}
 	}
 
-	fn read_from_registry(&mut self, client: &Client) {
+	fn read_from_registry(&mut self) {
 		let contract_address = match self.contract_address {
 			Some(contract_address) => contract_address,
 			None => {
@@ -361,7 +343,7 @@ impl CachedContract {
 			},
 		};
 
-		let do_call = |data| client.call_contract(BlockId::Latest, contract_address, data);
+		let do_call = |data| self.client.call_contract(BlockId::Latest, contract_address, data);
 
 		let current_set = Self::read_key_server_set(CurrentKeyServerSubset, &do_call);
 
@@ -434,7 +416,7 @@ impl CachedContract {
 
 		// we might want to adjust new_set if auto migration is enabled
 		if self.auto_migrate_enabled {
-			let block = client.block_hash(BlockId::Latest).unwrap_or_default();
+			let block = self.client.block_hash(BlockId::Latest).unwrap_or_default();
 			update_future_set(&mut self.future_new_set, &mut new_snapshot, block);
 		}
 
@@ -474,14 +456,14 @@ impl CachedContract {
 		key_servers
 	}
 
-	fn update_number_of_confirmations_if_required(&mut self, client: &dyn BlockChainClient) {
+	fn update_number_of_confirmations_if_required(&mut self) {
 		if !self.auto_migrate_enabled {
 			return;
 		}
-
+		let client = &*self.client;
 		update_number_of_confirmations(
-			&|| latest_block_hash(&*client),
-			&|block| block_confirmations(&*client, block),
+			&|| latest_block_hash(client),
+			&|block| block_confirmations(client, block),
 			&mut self.future_new_set, &mut self.snapshot);
 	}
 }
@@ -549,7 +531,7 @@ fn update_number_of_confirmations<F1: Fn() -> H256, F2: Fn(H256) -> Option<u64>>
 	snapshot.new_set = future_new_set.new_set;
 }
 
-fn update_last_transaction_block(client: &Client, migration_id: &H256, previous_transaction: &mut Option<PreviousMigrationTransaction>) -> bool {
+fn update_last_transaction_block(client: &dyn SecretStoreChain, migration_id: &H256, previous_transaction: &mut Option<PreviousMigrationTransaction>) -> bool {
 	let last_block = client.block_number(BlockId::Latest).unwrap_or_default();
 	match previous_transaction.as_ref() {
 		// no previous transaction => send immediately
@@ -577,11 +559,11 @@ fn update_last_transaction_block(client: &Client, migration_id: &H256, previous_
 	true
 }
 
-fn latest_block_hash(client: &dyn BlockChainClient) -> H256 {
+fn latest_block_hash(client: &dyn SecretStoreChain) -> H256 {
 	client.block_hash(BlockId::Latest).unwrap_or_default()
 }
 
-fn block_confirmations(client: &dyn BlockChainClient, block: H256) -> Option<u64> {
+fn block_confirmations(client: &dyn SecretStoreChain, block: H256) -> Option<u64> {
 	client.block_number(BlockId::Hash(block))
 		.and_then(|block| client.block_number(BlockId::Latest).map(|last_block| (block, last_block)))
 		.map(|(block, last_block)| last_block - block)

secret-store/src/lib.rs

@@ -15,12 +15,7 @@
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
 extern crate byteorder;
-extern crate client_traits;
-extern crate common_types;
 extern crate ethabi;
-extern crate ethcore;
-extern crate ethcore_call_contract as call_contract;
-extern crate ethcore_sync as sync;
 extern crate ethereum_types;
 extern crate hyper;
 extern crate keccak_hash as hash;
@@ -31,7 +26,6 @@ extern crate parity_crypto as crypto;
 extern crate parity_runtime;
 extern crate parking_lot;
 extern crate percent_encoding;
-extern crate registrar;
 extern crate rustc_hex;
 extern crate serde;
 extern crate serde_json;
@@ -54,19 +48,13 @@ extern crate lazy_static;
 #[macro_use]
 extern crate log;
 
-#[cfg(any(test, feature = "accounts"))]
-extern crate ethkey;
 #[cfg(test)]
 extern crate env_logger;
 #[cfg(test)]
 extern crate tempdir;
 
-#[cfg(feature = "accounts")]
-extern crate ethcore_accounts as accounts;
-
 mod key_server_cluster;
 mod types;
-mod helpers;
 
 mod traits;
 mod acl_storage;
@@ -76,23 +64,19 @@ mod serialization;
 mod key_server_set;
 mod node_key_pair;
 mod listener;
-mod trusted_client;
+mod blockchain;
 mod migration;
 
 use std::sync::Arc;
 use kvdb::KeyValueDB;
 use kvdb_rocksdb::{Database, DatabaseConfig};
-use ethcore::client::Client;
-use ethcore::miner::Miner;
-use sync::SyncProvider;
 use parity_runtime::Executor;
 
 pub use types::{ServerKeyId, EncryptedDocumentKey, RequestSignature, Public,
-	Error, NodeAddress, ContractAddress, ServiceConfiguration, ClusterConfiguration};
-pub use traits::{NodeKeyPair, KeyServer};
+	Error, NodeAddress, ServiceConfiguration, ClusterConfiguration};
+pub use traits::KeyServer;
+pub use blockchain::{SecretStoreChain, SigningKeyPair, ContractAddress, BlockId, BlockNumber, NewBlocksNotify, Filter};
 pub use self::node_key_pair::PlainNodeKeyPair;
-#[cfg(feature = "accounts")]
-pub use self::node_key_pair::KeyStoreNodeKeyPair;
 
 /// Open a secret store DB using the given secret store data path. The DB path is one level beneath the data path.
 pub fn open_secretstore_db(data_path: &str) -> Result<Arc<dyn KeyValueDB>, String> {
@@ -109,10 +93,9 @@ pub fn open_secretstore_db(data_path: &str) -> Result<Arc<dyn KeyValueDB>, Strin
 }
 
 /// Start new key server instance
-pub fn start(client: Arc<Client>, sync: Arc<dyn SyncProvider>, miner: Arc<Miner>, self_key_pair: Arc<dyn NodeKeyPair>, mut config: ServiceConfiguration,
+pub fn start(trusted_client: Arc<dyn SecretStoreChain>, self_key_pair: Arc<dyn SigningKeyPair>, mut config: ServiceConfiguration,
 	db: Arc<dyn KeyValueDB>, executor: Executor) -> Result<Box<dyn KeyServer>, Error>
 {
-	let trusted_client = trusted_client::TrustedClient::new(self_key_pair.clone(), client.clone(), sync, miner);
 	let acl_storage: Arc<dyn acl_storage::AclStorage> = match config.acl_check_contract_address.take() {
 		Some(acl_check_contract_address) => acl_storage::OnChainAclStorage::new(trusted_client.clone(), acl_check_contract_address)?,
 		None => Arc::new(acl_storage::DummyAclStorage::default()),
@@ -186,7 +169,7 @@ pub fn start(client: Arc<Client>, sync: Arc<dyn SyncProvider>, miner: Arc<Miner>
 					key_storage: key_storage,
 				}
 			)?;
-			client.add_notify(listener.clone());
+			trusted_client.add_listener(listener.clone());
 			listener
 		}),
 		None => None,

secret-store/src/listener/service_contract.rs

@@ -16,22 +16,16 @@
 
 use std::sync::Arc;
 use parking_lot::RwLock;
-use common_types::filter::Filter;
 use ethabi::RawLog;
 use ethabi::FunctionOutputDecoder;
-use call_contract::CallContract;
-use ethcore::client::Client;
-use client_traits::BlockChainClient;
-use common_types::ids::BlockId;
 use crypto::publickey::{Public, public_to_address};
 use hash::keccak;
 use bytes::Bytes;
 use ethereum_types::{H256, U256, Address, H512};
 use listener::ApiMask;
 use listener::service_contract_listener::ServiceTask;
-use trusted_client::TrustedClient;
-use helpers::{get_confirmed_block_hash, REQUEST_CONFIRMATIONS_REQUIRED};
-use {ServerKeyId, NodeKeyPair, ContractAddress};
+use blockchain::{SecretStoreChain, Filter, SigningKeyPair, ContractAddress, BlockId};
+use ServerKeyId;
 
 use_contract!(service, "res/service.json");
 
@@ -98,9 +92,9 @@ pub struct OnChainServiceContract {
 	/// Requests mask.
 	mask: ApiMask,
 	/// Blockchain client.
-	client: TrustedClient,
+	client: Arc<dyn SecretStoreChain>,
 	/// This node key pair.
-	self_key_pair: Arc<dyn NodeKeyPair>,
+	self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Contract registry name (if any).
 	name: String,
 	/// Contract address source.
@@ -138,7 +132,7 @@ struct DocumentKeyShadowRetrievalService;
 
 impl OnChainServiceContract {
 	/// Create new on-chain service contract.
-	pub fn new(mask: ApiMask, client: TrustedClient, name: String, address_source: ContractAddress, self_key_pair: Arc<dyn NodeKeyPair>) -> Self {
+	pub fn new(mask: ApiMask, client: Arc<dyn SecretStoreChain>, name: String, address_source: ContractAddress, self_key_pair: Arc<dyn SigningKeyPair>) -> Self {
 		let contract = OnChainServiceContract {
 			mask: mask,
 			client: client,
@@ -157,24 +151,23 @@ impl OnChainServiceContract {
 
 	/// Send transaction to the service contract.
 	fn send_contract_transaction<C, P>(&self, tx_name: &str, origin: &Address, server_key_id: &ServerKeyId, is_response_required: C, prepare_tx: P) -> Result<(), String>
-		where C: FnOnce(&Client, &Address, &ServerKeyId, &Address) -> bool,
-			P: FnOnce(&Client, &Address) -> Result<Bytes, String> {
+		where C: FnOnce(&dyn SecretStoreChain, &Address, &ServerKeyId, &Address) -> bool,
+			P: FnOnce(&dyn SecretStoreChain, &Address) -> Result<Bytes, String> {
 		// only publish if contract address is set && client is online
-		let client = match self.client.get() {
-			Some(client) => client,
-			None => return Err("trusted client is required to publish key".into()),
-		};
+		if !self.client.is_trusted() {
+			return Err("trusted client is required to publish key".into())
+		}
 
 		// only publish key if contract waits for publication
 		// failing is ok here - it could be that enough confirmations have been recevied
 		// or key has been requested using HTTP API
 		let self_address = public_to_address(self.self_key_pair.public());
-		if !is_response_required(&*client, origin, server_key_id, &self_address) {
+		if !is_response_required(&*self.client, origin, server_key_id, &self_address) {
 			return Ok(());
 		}
 
 		// prepare transaction data
-		let transaction_data = prepare_tx(&*client, origin)?;
+		let transaction_data = prepare_tx(&*self.client, origin)?;
 
 		// send transaction
 		self.client.transact_contract(
@@ -190,9 +183,9 @@ impl OnChainServiceContract {
 
 	/// Create task-specific pending requests iterator.
 	fn create_pending_requests_iterator<
-		C: 'static + Fn(&Client, &Address, &BlockId) -> Result<U256, String>,
-		R: 'static + Fn(&dyn NodeKeyPair, &Client, &Address, &BlockId, U256) -> Result<(bool, ServiceTask), String>
-	>(&self, client: Arc<Client>, contract_address: &Address, block: &BlockId, get_count: C, read_item: R) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
+		C: 'static + Fn(&dyn SecretStoreChain, &Address, &BlockId) -> Result<U256, String>,
+		R: 'static + Fn(&dyn SigningKeyPair, &dyn SecretStoreChain, &Address, &BlockId, U256) -> Result<(bool, ServiceTask), String>
+	>(&self, client: Arc<dyn SecretStoreChain>, contract_address: &Address, block: &BlockId, get_count: C, read_item: R) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
 		get_count(&*client, contract_address, block)
 			.map(|count| {
 				let client = client.clone();
@@ -237,67 +230,46 @@ impl OnChainServiceContract {
 
 impl ServiceContract for OnChainServiceContract {
 	fn update(&self) -> bool {
-		self.update_contract_address() && self.client.get().is_some()
+		self.update_contract_address() && self.client.is_trusted()
 	}
 
 	fn read_logs(&self) -> Box<dyn Iterator<Item=ServiceTask>> {
-		let client = match self.client.get() {
-			Some(client) => client,
-			None => {
-				warn!(target: "secretstore", "{}: client is offline during read_logs call",
-					self.self_key_pair.public());
-				return Box::new(::std::iter::empty());
-			},
+		if !self.client.is_trusted() {
+			warn!(target: "secretstore", "{}: client is offline during read_logs call",
+				self.self_key_pair.public());
+			return Box::new(::std::iter::empty());
+		}
+
+		let address = match self.data.read().contract_address {
+			Some(address) => address,
+			None => return Box::new(::std::iter::empty()), // no contract installed
+		};
+		let confirmed_block = match self.client.get_confirmed_block_hash() {
+			Some(confirmed_block) => confirmed_block,
+			None => return Box::new(::std::iter::empty()), // no block with enough confirmations
 		};
 
-		// prepare range of blocks to read logs from
-		let (address, first_block, last_block) = {
-			let mut data = self.data.write();
-			let address = match data.contract_address {
-				Some(address) => address,
-				None => return Box::new(::std::iter::empty()), // no contract installed
-			};
-			let confirmed_block = match get_confirmed_block_hash(&*client, REQUEST_CONFIRMATIONS_REQUIRED) {
-				Some(confirmed_block) => confirmed_block,
-				None => return Box::new(::std::iter::empty()), // no block with enough confirmations
-			};
-			let first_block = match data.last_log_block.take().and_then(|b| client.tree_route(&b, &confirmed_block)) {
-				// if we have a route from last_log_block to confirmed_block => search for logs on this route
-				//
-				// potentially this could lead us to reading same logs twice when reorganizing to the fork, which
-				// already has been canonical previosuly
-				// the worst thing that can happen in this case is spending some time reading unneeded data from SS db
-				Some(ref route) if route.index < route.blocks.len() => route.blocks[route.index],
-				// else we care only about confirmed block
-				_ => confirmed_block.clone(),
-			};
-
-			data.last_log_block = Some(confirmed_block.clone());
-			(address, first_block, confirmed_block)
-		};
-
-		// read server key generation requests
-		let request_logs = client.logs(Filter {
-			from_block: BlockId::Hash(first_block),
-			to_block: BlockId::Hash(last_block),
+		let request_logs = self.client.retrieve_last_logs(Filter {
+			from_block: BlockId::Hash(self.data.read().last_log_block.unwrap_or_else(|| confirmed_block)),
 			address: Some(vec![address]),
 			topics: vec![Some(mask_topics(&self.mask))],
-			limit: None,
 		}).unwrap_or_default();
 
+		let mut data = self.data.write();
+		data.last_log_block = Some(confirmed_block.clone());
+
 		Box::new(request_logs.into_iter()
 			.filter_map(|log| {
-				let raw_log: RawLog = (log.entry.topics.into_iter().map(|t| t.0.into()).collect(), log.entry.data).into();
-				if raw_log.topics[0] == *SERVER_KEY_GENERATION_REQUESTED_EVENT_NAME_HASH {
-					ServerKeyGenerationService::parse_log(&address, raw_log)
-				} else if raw_log.topics[0] == *SERVER_KEY_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
-					ServerKeyRetrievalService::parse_log(&address, raw_log)
-				} else if raw_log.topics[0] == *DOCUMENT_KEY_STORE_REQUESTED_EVENT_NAME_HASH {
-					DocumentKeyStoreService::parse_log(&address, raw_log)
-				} else if raw_log.topics[0] == *DOCUMENT_KEY_COMMON_PART_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
-					DocumentKeyShadowRetrievalService::parse_common_request_log(&address, raw_log)
-				} else if raw_log.topics[0] == *DOCUMENT_KEY_PERSONAL_PART_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
-					DocumentKeyShadowRetrievalService::parse_personal_request_log(&address, raw_log)
+				if log.topics[0] == *SERVER_KEY_GENERATION_REQUESTED_EVENT_NAME_HASH {
+					ServerKeyGenerationService::parse_log(&address, log)
+				} else if log.topics[0] == *SERVER_KEY_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
+					ServerKeyRetrievalService::parse_log(&address, log)
+				} else if log.topics[0] == *DOCUMENT_KEY_STORE_REQUESTED_EVENT_NAME_HASH {
+					DocumentKeyStoreService::parse_log(&address, log)
+				} else if log.topics[0] == *DOCUMENT_KEY_COMMON_PART_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
+					DocumentKeyShadowRetrievalService::parse_common_request_log(&address, log)
+				} else if log.topics[0] == *DOCUMENT_KEY_PERSONAL_PART_RETRIEVAL_REQUESTED_EVENT_NAME_HASH {
+					DocumentKeyShadowRetrievalService::parse_personal_request_log(&address, log)
 				} else {
 					Err("unknown type of log entry".into())
 				}
@@ -311,39 +283,37 @@ impl ServiceContract for OnChainServiceContract {
 	}
 
 	fn read_pending_requests(&self) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
-		let client = match self.client.get() {
-			Some(client) => client,
-			None => return Box::new(::std::iter::empty()),
-		};
+		if !self.client.is_trusted() {
+			return Box::new(::std::iter::empty())
+		}
 
-		// we only need requests that are here for more than REQUEST_CONFIRMATIONS_REQUIRED blocks
-		// => we're reading from Latest - (REQUEST_CONFIRMATIONS_REQUIRED + 1) block
+		// we only need requests that are here from the last confirm block
 		let data = self.data.read();
 		match data.contract_address {
 			None => Box::new(::std::iter::empty()),
-			Some(contract_address) => get_confirmed_block_hash(&*client, REQUEST_CONFIRMATIONS_REQUIRED + 1)
+			Some(contract_address) => self.client.get_confirmed_block_hash()
 				.map(|b| {
 					let block = BlockId::Hash(b);
 					let iter = match self.mask.server_key_generation_requests {
-						true => Box::new(self.create_pending_requests_iterator(client.clone(), &contract_address, &block,
+						true => Box::new(self.create_pending_requests_iterator(self.client.clone(), &contract_address, &block,
 							&ServerKeyGenerationService::read_pending_requests_count,
 							&ServerKeyGenerationService::read_pending_request)) as Box<dyn Iterator<Item=(bool, ServiceTask)>>,
 						false => Box::new(::std::iter::empty()),
 					};
 					let iter = match self.mask.server_key_retrieval_requests {
-						true => Box::new(iter.chain(self.create_pending_requests_iterator(client.clone(), &contract_address, &block,
+						true => Box::new(iter.chain(self.create_pending_requests_iterator(self.client.clone(), &contract_address, &block,
 							&ServerKeyRetrievalService::read_pending_requests_count,
 							&ServerKeyRetrievalService::read_pending_request))),
 						false => iter,
 					};
 					let iter = match self.mask.document_key_store_requests {
-						true => Box::new(iter.chain(self.create_pending_requests_iterator(client.clone(), &contract_address, &block,
+						true => Box::new(iter.chain(self.create_pending_requests_iterator(self.client.clone(), &contract_address, &block,
 							&DocumentKeyStoreService::read_pending_requests_count,
 							&DocumentKeyStoreService::read_pending_request))),
 						false => iter,
 					};
 					let iter = match self.mask.document_key_shadow_retrieval_requests {
-						true => Box::new(iter.chain(self.create_pending_requests_iterator(client, &contract_address, &block,
+						true => Box::new(iter.chain(self.create_pending_requests_iterator(self.client.clone(), &contract_address, &block,
 							&DocumentKeyShadowRetrievalService::read_pending_requests_count,
 							&DocumentKeyShadowRetrievalService::read_pending_request))),
 						false => iter
@@ -457,7 +427,7 @@ impl ServerKeyGenerationService {
 	}
 
 	/// Check if response from key server is required.
-	pub fn is_response_required(client: &Client, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
+	pub fn is_response_required(client: &dyn SecretStoreChain, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
 		// we're checking confirmation in Latest block, because we're interested in latest contract state here
 		let (encoded, decoder) = service::functions::is_server_key_generation_response_required::call(*server_key_id, *key_server);
 		match client.call_contract(BlockId::Latest, *contract_address, encoded) {
@@ -477,14 +447,14 @@ impl ServerKeyGenerationService {
 	}
 
 	/// Read pending requests count.
-	fn read_pending_requests_count(client: &Client, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
+	fn read_pending_requests_count(client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
 		let (encoded, decoder) = service::functions::server_key_generation_requests_count::call();
 		decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
 			.map_err(|e| e.to_string())
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn SigningKeyPair, client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_server_key_generation_request::call(index);
@@ -517,7 +487,7 @@ impl ServerKeyRetrievalService {
 	}
 
 	/// Check if response from key server is required.
-	pub fn is_response_required(client: &Client, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
+	pub fn is_response_required(client: &dyn SecretStoreChain, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
 		// we're checking confirmation in Latest block, because we're interested in latest contract state here
 		let (encoded, decoder) = service::functions::is_server_key_retrieval_response_required::call(*server_key_id, *key_server);
 		match client.call_contract(BlockId::Latest, *contract_address, encoded) {
@@ -537,14 +507,14 @@ impl ServerKeyRetrievalService {
 	}
 
 	/// Read pending requests count.
-	fn read_pending_requests_count(client: &Client, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
+	fn read_pending_requests_count(client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
 		let (encoded, decoder) = service::functions::server_key_retrieval_requests_count::call();
 		decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
 			.map_err(|e| e.to_string())
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn SigningKeyPair, client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_server_key_retrieval_request::call(index);
@@ -580,7 +550,7 @@ impl DocumentKeyStoreService {
 	}
 
 	/// Check if response from key server is required.
-	pub fn is_response_required(client: &Client, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
+	pub fn is_response_required(client: &dyn SecretStoreChain, contract_address: &Address, server_key_id: &ServerKeyId, key_server: &Address) -> bool {
 		// we're checking confirmation in Latest block, because we're interested in latest contract state here
 		let (encoded, decoder) = service::functions::is_document_key_store_response_required::call(*server_key_id, *key_server);
 		match client.call_contract(BlockId::Latest, *contract_address, encoded) {
@@ -600,14 +570,14 @@ impl DocumentKeyStoreService {
 	}
 
 	/// Read pending requests count.
-	fn read_pending_requests_count(client: &Client, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
+	fn read_pending_requests_count(client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
 		let (encoded, decoder) = service::functions::document_key_store_requests_count::call();
 		decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
 			.map_err(|e| e.to_string())
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn SigningKeyPair, client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 		let (encoded, decoder) = service::functions::get_document_key_store_request::call(index);
 		let (server_key_id, author, common_point, encrypted_point) = decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
@@ -647,7 +617,7 @@ impl DocumentKeyShadowRetrievalService {
 	}
 
 	/// Check if response from key server is required.
-	pub fn is_response_required(client: &Client, contract_address: &Address, server_key_id: &ServerKeyId, requester: &Address, key_server: &Address) -> bool {
+	pub fn is_response_required(client: &dyn SecretStoreChain, contract_address: &Address, server_key_id: &ServerKeyId, requester: &Address, key_server: &Address) -> bool {
 		// we're checking confirmation in Latest block, because we're interested in latest contract state here
 		let (encoded, decoder) = service::functions::is_document_key_shadow_retrieval_response_required::call(*server_key_id, *requester, *key_server);
 		match client.call_contract(BlockId::Latest, *contract_address, encoded) {
@@ -662,7 +632,7 @@ impl DocumentKeyShadowRetrievalService {
 	}
 
 	/// Prepare publish personal key transaction data.
-	pub fn prepare_pubish_personal_tx_data(client: &Client, contract_address: &Address, server_key_id: &ServerKeyId, requester: &Address, participants: &[Address], decrypted_secret: Public, shadow: Bytes) -> Result<Bytes, String> {
+	pub fn prepare_pubish_personal_tx_data(client: &dyn SecretStoreChain, contract_address: &Address, server_key_id: &ServerKeyId, requester: &Address, participants: &[Address], decrypted_secret: Public, shadow: Bytes) -> Result<Bytes, String> {
 		let mut participants_mask = U256::default();
 		for participant in participants {
 			let participant_index = Self::map_key_server_address(client, contract_address, participant.clone())
@@ -680,14 +650,14 @@ impl DocumentKeyShadowRetrievalService {
 	}
 
 	/// Read pending requests count.
-	fn read_pending_requests_count(client: &Client, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
+	fn read_pending_requests_count(client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId) -> Result<U256, String> {
 		let (encoded, decoder) = service::functions::document_key_shadow_retrieval_requests_count::call();
 		decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
 			.map_err(|e| e.to_string())
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn SigningKeyPair, client: &dyn SecretStoreChain, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_document_key_shadow_retrieval_request::call(index);
@@ -717,7 +687,7 @@ impl DocumentKeyShadowRetrievalService {
 	}
 
 	/// Map from key server address to key server index.
-	fn map_key_server_address(client: &Client, contract_address: &Address, key_server: Address) -> Result<u8, String> {
+	fn map_key_server_address(client: &dyn SecretStoreChain, contract_address: &Address, key_server: Address) -> Result<u8, String> {
 		// we're checking confirmation in Latest block, because tx ,ust be appended to the latest state
 		let (encoded, decoder) = service::functions::require_key_server::call(key_server);
 		let index = decoder.decode(&client.call_contract(BlockId::Latest, *contract_address, encoded)?)

secret-store/src/listener/service_contract_listener.rs

@@ -18,8 +18,6 @@ use std::collections::HashSet;
 use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::thread;
-use client_traits::ChainNotify;
-use common_types::chain_notify::NewBlocks;
 use bytes::Bytes;
 use crypto::publickey::{Public, public_to_address};
 use ethereum_types::{H256, U256, Address, BigEndianHash as _};
@@ -36,7 +34,8 @@ use parking_lot::Mutex;
 use acl_storage::AclStorage;
 use listener::service_contract::ServiceContract;
 use listener::tasks_queue::TasksQueue;
-use {ServerKeyId, NodeKeyPair, Error};
+use {ServerKeyId, Error};
+use blockchain::{NewBlocksNotify, SigningKeyPair};
 
 /// Retry interval (in blocks). Every RETRY_INTERVAL_BLOCKS blocks each KeyServer reads pending requests from
 /// service contract && tries to re-execute. The reason to have this mechanism is primarily because keys
@@ -64,7 +63,7 @@ pub struct ServiceContractListenerParams {
 	/// Service contract.
 	pub contract: Arc<dyn ServiceContract>,
 	/// This node key pair.
-	pub self_key_pair: Arc<dyn NodeKeyPair>,
+	pub self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Key servers set.
 	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// ACL storage reference.
@@ -90,7 +89,7 @@ struct ServiceContractListenerData {
 	/// Cluster client reference.
 	pub cluster: Arc<dyn ClusterClient>,
 	/// This node key pair.
-	pub self_key_pair: Arc<dyn NodeKeyPair>,
+	pub self_key_pair: Arc<dyn SigningKeyPair>,
 	/// Key servers set.
 	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// Key storage reference.
@@ -434,14 +433,8 @@ impl Drop for ServiceContractListener {
 	}
 }
 
-impl ChainNotify for ServiceContractListener {
-	fn new_blocks(&self, new_blocks: NewBlocks) {
-		if new_blocks.has_more_blocks_to_import { return }
-		let enacted_len = new_blocks.route.enacted().len();
-		if enacted_len == 0 && new_blocks.route.retracted().is_empty() {
-			return;
-		}
-
+impl NewBlocksNotify for ServiceContractListener {
+	fn new_blocks(&self, new_enacted_len: usize) {
 		if !self.data.contract.update() {
 			return;
 		}
@@ -450,7 +443,7 @@ impl ChainNotify for ServiceContractListener {
 
 		// schedule retry if received enough blocks since last retry
 		// it maybe inaccurate when switching syncing/synced states, but that's ok
-		if self.data.last_retry.fetch_add(enacted_len, Ordering::Relaxed) >= RETRY_INTERVAL_BLOCKS {
+		if self.data.last_retry.fetch_add(new_enacted_len, Ordering::Relaxed) >= RETRY_INTERVAL_BLOCKS {
 			// shortcut: do not retry if we're isolated from the cluster
 			if !self.data.key_server_set.is_isolated() {
 				self.data.tasks_queue.push(ServiceTask::Retry);
@@ -596,7 +589,8 @@ mod tests {
 	use key_storage::tests::DummyKeyStorage;
 	use key_server_set::KeyServerSet;
 	use key_server_set::tests::MapKeyServerSet;
-	use {NodeKeyPair, PlainNodeKeyPair, ServerKeyId};
+	use blockchain::SigningKeyPair;
+	use {PlainNodeKeyPair, ServerKeyId};
 	use super::{ServiceTask, ServiceContractListener, ServiceContractListenerParams, is_processed_by_this_key_server};
 	use ethereum_types::Address;
 

secret-store/src/node_key_pair.rs

@@ -14,10 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-use crypto::publickey::ecdh::agree;
 use crypto::publickey::{KeyPair, Public, Signature, Error as EthKeyError, sign, public_to_address};
 use ethereum_types::{H256, Address};
-use traits::NodeKeyPair;
+use blockchain::SigningKeyPair;
 
 pub struct PlainNodeKeyPair {
 	key_pair: KeyPair,
@@ -36,7 +35,7 @@ impl PlainNodeKeyPair {
 	}
 }
 
-impl NodeKeyPair for PlainNodeKeyPair {
+impl SigningKeyPair for PlainNodeKeyPair {
 	fn public(&self) -> &Public {
 		self.key_pair.public()
 	}
@@ -48,60 +47,4 @@ impl NodeKeyPair for PlainNodeKeyPair {
 	fn sign(&self, data: &H256) -> Result<Signature, EthKeyError> {
 		sign(self.key_pair.secret(), data)
 	}
-
-	fn compute_shared_key(&self, peer_public: &Public) -> Result<KeyPair, EthKeyError> {
-		agree(self.key_pair.secret(), peer_public)
-			.map_err(|e| EthKeyError::Custom(e.to_string()))
-			.and_then(KeyPair::from_secret)
-	}
 }
-
-#[cfg(feature = "accounts")]
-mod accounts {
-	use super::*;
-	use std::sync::Arc;
-	use ethkey::Password;
-	use accounts::AccountProvider;
-
-	pub struct KeyStoreNodeKeyPair {
-		account_provider: Arc<AccountProvider>,
-		address: Address,
-		public: Public,
-		password: Password,
-	}
-
-	impl KeyStoreNodeKeyPair {
-		pub fn new(account_provider: Arc<AccountProvider>, address: Address, password: Password) -> Result<Self, EthKeyError> {
-			let public = account_provider.account_public(address.clone(), &password).map_err(|e| EthKeyError::Custom(format!("{}", e)))?;
-			Ok(KeyStoreNodeKeyPair {
-				account_provider,
-				address,
-				public,
-				password,
-			})
-		}
-	}
-
-	impl NodeKeyPair for KeyStoreNodeKeyPair {
-		fn public(&self) -> &Public {
-			&self.public
-		}
-
-		fn address(&self) -> Address {
-			public_to_address(&self.public)
-		}
-
-		fn sign(&self, data: &H256) -> Result<Signature, EthKeyError> {
-			self.account_provider.sign(self.address.clone(), Some(self.password.clone()), data.clone())
-				.map_err(|e| EthKeyError::Custom(format!("{}", e)))
-		}
-
-		fn compute_shared_key(&self, peer_public: &Public) -> Result<KeyPair, EthKeyError> {
-			KeyPair::from_secret(self.account_provider.agree(self.address.clone(), Some(self.password.clone()), peer_public)
-				.map_err(|e| EthKeyError::Custom(format!("{}", e)))?)
-		}
-	}
-}
-
-#[cfg(feature = "accounts")]
-pub use self::accounts::KeyStoreNodeKeyPair;

secret-store/src/traits.rs

@@ -16,23 +16,9 @@
 
 use std::collections::BTreeSet;
 use futures::Future;
-use crypto::publickey::{KeyPair, Signature, Error as EthKeyError};
-use ethereum_types::{H256, Address};
 use types::{Error, Public, ServerKeyId, MessageHash, EncryptedMessageSignature, RequestSignature, Requester,
 	EncryptedDocumentKey, EncryptedDocumentKeyShadow, NodeId};
 
-/// Node key pair.
-pub trait NodeKeyPair: Send + Sync {
-	/// Public portion of key.
-	fn public(&self) -> &Public;
-	/// Address of key owner.
-	fn address(&self) -> Address;
-	/// Sign data with node key.
-	fn sign(&self, data: &H256) -> Result<Signature, EthKeyError>;
-	/// Compute shared key to encrypt channel between two nodes.
-	fn compute_shared_key(&self, peer_public: &Public) -> Result<KeyPair, EthKeyError>;
-}
-
 /// Server key (SK) generator.
 pub trait ServerKeyGenerator {
 	/// Generate new SK.

secret-store/src/trusted_client.rs

@@ -1,114 +0,0 @@
-// Copyright 2015-2019 Parity Technologies (UK) Ltd.
-// This file is part of Parity Ethereum.
-
-// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.
-
-use std::sync::{Arc, Weak};
-use bytes::Bytes;
-use common_types::{
-	ids::BlockId,
-	transaction::{Transaction, SignedTransaction, Action},
-};
-use ethereum_types::Address;
-use ethcore::client::Client;
-use client_traits::{ChainInfo, Nonce};
-use ethcore::miner::{Miner, MinerService};
-use sync::SyncProvider;
-use helpers::{get_confirmed_block_hash, REQUEST_CONFIRMATIONS_REQUIRED};
-use {Error, NodeKeyPair, ContractAddress};
-use registrar::RegistrarClient;
-
-#[derive(Clone)]
-/// 'Trusted' client weak reference.
-pub struct TrustedClient {
-	/// This key server node key pair.
-	self_key_pair: Arc<dyn NodeKeyPair>,
-	/// Blockchain client.
-	client: Weak<Client>,
-	/// Sync provider.
-	sync: Weak<dyn SyncProvider>,
-	/// Miner service.
-	miner: Weak<Miner>,
-}
-
-impl TrustedClient {
-	/// Create new trusted client.
-	pub fn new(self_key_pair: Arc<dyn NodeKeyPair>, client: Arc<Client>, sync: Arc<dyn SyncProvider>, miner: Arc<Miner>) -> Self {
-		TrustedClient {
-			self_key_pair,
-			client: Arc::downgrade(&client),
-			sync: Arc::downgrade(&sync),
-			miner: Arc::downgrade(&miner),
-		}
-	}
-
-	/// Get 'trusted' `Client` reference only if it is synchronized && trusted.
-	pub fn get(&self) -> Option<Arc<Client>> {
-		self.client.upgrade()
-			.and_then(|client| self.sync.upgrade().map(|sync| (client, sync)))
-			.and_then(|(client, sync)| {
-				let is_synced = !sync.is_major_syncing();
-				let is_trusted = client.chain_info().security_level().is_full();
-				match is_synced && is_trusted {
-					true => Some(client),
-					false => None,
-				}
-			})
-	}
-
-	/// Get untrusted `Client` reference.
-	pub fn get_untrusted(&self) -> Option<Arc<Client>> {
-		self.client.upgrade()
-	}
-
-	/// Transact contract.
-	pub fn transact_contract(&self, contract: Address, tx_data: Bytes) -> Result<(), Error> {
-		let client = self.client.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when client is offline".into()))?;
-		let miner = self.miner.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when miner is offline".into()))?;
-		let engine = client.engine();
-		let transaction = Transaction {
-			nonce: client.latest_nonce(&self.self_key_pair.address()),
-			action: Action::Call(contract),
-			gas: miner.authoring_params().gas_range_target.0,
-			gas_price: miner.sensible_gas_price(),
-			value: Default::default(),
-			data: tx_data,
-		};
-		let chain_id = engine.signing_chain_id(&client.latest_env_info());
-		let signature = self.self_key_pair.sign(&transaction.hash(chain_id))?;
-		let signed = SignedTransaction::new(transaction.with_signature(signature, chain_id))?;
-		miner.import_own_transaction(&*client, signed.into())
-			.map_err(|e| Error::Internal(format!("failed to import tx: {}", e)))
-	}
-
-	/// Read contract address. If address source is registry, address only returned if current client state is
-	/// trusted. Address from registry is read from registry from block latest block with
-	/// REQUEST_CONFIRMATIONS_REQUIRED confirmations.
-	pub fn read_contract_address(
-		&self,
-		registry_name: &str,
-		address: &ContractAddress
-	) -> Option<Address> {
-		match *address {
-			ContractAddress::Address(ref address) => Some(address.clone()),
-			ContractAddress::Registry => self.get().and_then(|client|
-				get_confirmed_block_hash(&*client, REQUEST_CONFIRMATIONS_REQUIRED)
-					.and_then(|block| {
-						client.get_address(registry_name, BlockId::Hash(block))
-							.unwrap_or(None)
-					})
-			),
-		}
-	}
-}

secret-store/src/types/all.rs

@@ -16,6 +16,7 @@
 
 use std::collections::BTreeMap;
 
+use blockchain::ContractAddress;
 use {bytes, ethereum_types};
 
 /// Node id.
@@ -42,15 +43,6 @@ pub struct NodeAddress {
 	pub port: u16,
 }
 
-/// Contract address.
-#[derive(Debug, Clone)]
-pub enum ContractAddress {
-	/// Address is read from registry.
-	Registry,
-	/// Address is specified.
-	Address(crypto::publickey::Address),
-}
-
 /// Secret store configuration
 #[derive(Debug)]
 pub struct ServiceConfiguration {