Merge branch 'master' into renamefield

Cargo.lock

@@ -286,8 +286,6 @@ dependencies = [
  "mime_guess 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-dapps 0.3.0 (git+https://github.com/ethcore/parity-dapps-rs.git)",
  "parity-dapps-builtins 0.5.1 (git+https://github.com/ethcore/parity-dapps-builtins-rs.git)",
- "parity-dapps-dao 0.4.0 (git+https://github.com/ethcore/parity-dapps-dao-rs.git)",
- "parity-dapps-makerotc 0.3.0 (git+https://github.com/ethcore/parity-dapps-makerotc-rs.git)",
  "parity-dapps-status 0.5.0 (git+https://github.com/ethcore/parity-dapps-status-rs.git)",
  "parity-dapps-wallet 0.6.1 (git+https://github.com/ethcore/parity-dapps-wallet-rs.git)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -917,26 +915,10 @@ dependencies = [
  "parity-dapps 0.3.0 (git+https://github.com/ethcore/parity-dapps-rs.git)",
 ]
 
-[[package]]
-name = "parity-dapps-dao"
-version = "0.4.0"
-source = "git+https://github.com/ethcore/parity-dapps-dao-rs.git#dd6b9ca7c18fbfa714183a4f570bd75b8391c13d"
-dependencies = [
- "parity-dapps 0.3.0 (git+https://github.com/ethcore/parity-dapps-rs.git)",
-]
-
-[[package]]
-name = "parity-dapps-makerotc"
-version = "0.3.0"
-source = "git+https://github.com/ethcore/parity-dapps-makerotc-rs.git#33568ac7209aa765c498bb2322e848f552656303"
-dependencies = [
- "parity-dapps 0.3.0 (git+https://github.com/ethcore/parity-dapps-rs.git)",
-]
-
 [[package]]
 name = "parity-dapps-status"
 version = "0.5.0"
-source = "git+https://github.com/ethcore/parity-dapps-status-rs.git#53e159f52013be5d2e8ba7eca35f605ad6e3bfa9"
+source = "git+https://github.com/ethcore/parity-dapps-status-rs.git#0cdd3512004e403aff7da3b8c16ba0bf5d6c911c"
 dependencies = [
  "parity-dapps 0.3.0 (git+https://github.com/ethcore/parity-dapps-rs.git)",
 ]

dapps/Cargo.toml

@@ -36,6 +36,6 @@ syntex = "*"
 
 [features]
 default = ["serde_codegen", "extra-dapps"]
-extra-dapps = ["parity-dapps-wallet", "parity-dapps-dao", "parity-dapps-makerotc"]
+extra-dapps = ["parity-dapps-wallet"]
 nightly = ["serde_macros"]
 dev = ["clippy", "ethcore-rpc/dev", "ethcore-util/dev"]

ethcore/src/service.rs

@@ -41,6 +41,10 @@ pub enum SyncMessage {
 	NewChainHead,
 	/// A block is ready
 	BlockVerified,
+	/// Start network command.
+	StartNetwork,
+	/// Stop network command.
+	StopNetwork,
 }
 
 /// IO Message type used for Network service
@@ -48,17 +52,20 @@ pub type NetSyncMessage = NetworkIoMessage<SyncMessage>;
 
 /// Client service setup. Creates and registers client and network services with the IO subsystem.
 pub struct ClientService {
-	net_service: NetworkService<SyncMessage>,
+	net_service: Arc<NetworkService<SyncMessage>>,
 	client: Arc<Client>,
 	panic_handler: Arc<PanicHandler>
 }
 
 impl ClientService {
 	/// Start the service in a separate thread.
-	pub fn start(config: ClientConfig, spec: Spec, net_config: NetworkConfiguration, db_path: &Path, miner: Arc<Miner>) -> Result<ClientService, Error> {
+	pub fn start(config: ClientConfig, spec: Spec, net_config: NetworkConfiguration, db_path: &Path, miner: Arc<Miner>, enable_network: bool) -> Result<ClientService, Error> {
 		let panic_handler = PanicHandler::new_in_arc();
-		let mut net_service = try!(NetworkService::start(net_config));
+		let net_service = try!(NetworkService::new(net_config));
 		panic_handler.forward_from(&net_service);
+		if enable_network {
+			try!(net_service.start());
+		}
 
 		info!("Starting {}", net_service.host_info());
 		info!("Configured for {} using {:?} engine", spec.name, spec.engine.name());
@@ -70,7 +77,7 @@ impl ClientService {
 		try!(net_service.io().register_handler(client_io));
 
 		Ok(ClientService {
-			net_service: net_service,
+			net_service: Arc::new(net_service),
 			client: client,
 			panic_handler: panic_handler,
 		})
@@ -82,8 +89,8 @@ impl ClientService {
 	}
 
 	/// Get general IO interface
-	pub fn io(&mut self) -> &mut IoService<NetSyncMessage> {
+	pub fn register_io_handler(&self, handler: Arc<IoHandler<NetSyncMessage> + Send>) -> Result<(), IoError> {
-		self.net_service.io()
+		self.net_service.io().register_handler(handler)
 	}
 
 	/// Get client interface
@@ -92,8 +99,8 @@ impl ClientService {
 	}
 
 	/// Get network service component
-	pub fn network(&mut self) -> &mut NetworkService<SyncMessage> {
+	pub fn network(&mut self) -> Arc<NetworkService<SyncMessage>> {
-		&mut self.net_service
+		self.net_service.clone()
 	}
 }
 
@@ -149,7 +156,7 @@ mod tests {
 	fn it_can_be_started() {
 		let spec = get_test_spec();
 		let temp_path = RandomTempPath::new();
-		let service = ClientService::start(ClientConfig::default(), spec, NetworkConfiguration::new_local(), &temp_path.as_path(), Arc::new(Miner::default()));
+		let service = ClientService::start(ClientConfig::default(), spec, NetworkConfiguration::new_local(), &temp_path.as_path(), Arc::new(Miner::default()), false);
 		assert!(service.is_ok());
 	}
 }

parity/cli.rs

@@ -53,6 +53,7 @@ Account Options:
   --no-import-keys         Do not import keys from legacy clients.
 
 Networking Options:
+  --no-network             Disable p2p networking.
   --port PORT              Override the port on which the node should listen
                            [default: 30303].
   --peers NUM              Try to maintain that many peers [default: 25].
@@ -268,6 +269,7 @@ pub struct Args {
 	pub flag_format: Option<String>,
 	pub flag_jitvm: bool,
 	pub flag_no_color: bool,
+	pub flag_no_network: bool,
 	// legacy...
 	pub flag_geth: bool,
 	pub flag_nodekey: Option<String>,

parity/io_handler.rs

@@ -16,10 +16,10 @@
 
 use std::sync::Arc;
 use ethcore::client::Client;
-use ethcore::service::NetSyncMessage;
+use ethcore::service::{NetSyncMessage, SyncMessage};
 use ethsync::EthSync;
 use util::keys::store::AccountService;
-use util::{TimerToken, IoHandler, IoContext};
+use util::{TimerToken, IoHandler, IoContext, NetworkService, NetworkIoMessage};
 
 use informant::Informant;
 
@@ -33,6 +33,7 @@ pub struct ClientIoHandler {
 	pub sync: Arc<EthSync>,
 	pub accounts: Arc<AccountService>,
 	pub info: Informant,
+	pub network: Arc<NetworkService<SyncMessage>>,
 }
 
 impl IoHandler<NetSyncMessage> for ClientIoHandler {
@@ -48,6 +49,21 @@ impl IoHandler<NetSyncMessage> for ClientIoHandler {
 			_ => {}
 		}
 	}
+
+	fn message(&self, _io: &IoContext<NetSyncMessage>, message: &NetSyncMessage) {
+		match *message {
+			NetworkIoMessage::User(SyncMessage::StartNetwork) => {
+				info!("Starting network");
+				self.network.start().unwrap_or_else(|e| warn!("Error starting network: {:?}", e));
+				EthSync::register(&*self.network, self.sync.clone()).unwrap_or_else(|e| warn!("Error registering eth protocol handler: {}", e));
+			},
+			NetworkIoMessage::User(SyncMessage::StopNetwork) => {
+				info!("Stopping network");
+				self.network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
+			},
+			_ => {/* Ignore other messages */},
+		}
+	}
 }
 
 

parity/main.rs

@@ -80,7 +80,7 @@ use std::thread::sleep;
 use std::time::Duration;
 use rustc_serialize::hex::FromHex;
 use ctrlc::CtrlC;
-use util::{H256, ToPretty, NetworkConfiguration, PayloadInfo, Bytes};
+use util::{H256, ToPretty, NetworkConfiguration, PayloadInfo, Bytes, UtilError};
 use util::panics::{MayPanic, ForwardPanic, PanicHandler};
 use ethcore::client::{BlockID, BlockChainClient, ClientConfig, get_db_path};
 use ethcore::error::{Error, ImportError};
@@ -199,7 +199,7 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 
 	// Build client
 	let mut service = ClientService::start(
-		client_config, spec, net_settings, Path::new(&conf.path()), miner.clone()
+		client_config, spec, net_settings, Path::new(&conf.path()), miner.clone(), !conf.args.flag_no_network
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);
@@ -209,7 +209,8 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 	let network_settings = Arc::new(conf.network_settings());
 
 	// Sync
-	let sync = EthSync::register(service.network(), sync_config, client.clone());
+	let sync = EthSync::new(sync_config, client.clone());
+	EthSync::register(&*service.network(), sync.clone()).unwrap_or_else(|e| die_with_error("Error registering eth protocol handler", UtilError::from(e).into()));
 
 	let deps_for_rpc_apis = Arc::new(rpc_apis::Dependencies {
 		signer_port: conf.signer_port(),
@@ -270,8 +271,9 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 		info: Informant::new(conf.have_color()),
 		sync: sync.clone(),
 		accounts: account_service.clone(),
+		network: service.network(),
 	});
-	service.io().register_handler(io_handler).expect("Error registering IO handler");
+	service.register_io_handler(io_handler).expect("Error registering IO handler");
 
 	if conf.args.cmd_ui {
 		url::open("http://localhost:8080/")
@@ -314,7 +316,7 @@ fn execute_export(conf: Configuration) {
 
 	// Build client
 	let service = ClientService::start(
-		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::default()),
+		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::default()), false
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);
@@ -385,7 +387,7 @@ fn execute_import(conf: Configuration) {
 
 	// Build client
 	let service = ClientService::start(
-		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::default()),
+		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::default()), false
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);

parity/rpc_apis.rs

@@ -122,10 +122,10 @@ fn list_apis(apis: ApiSet) -> Vec<Api> {
 	match apis {
 		ApiSet::List(apis) => apis,
 		ApiSet::UnsafeContext => {
-			vec![Api::Web3, Api::Net, Api::Eth, Api::Personal, Api::Ethcore, Api::EthcoreSet, Api::Traces, Api::Rpc]
+			vec![Api::Web3, Api::Net, Api::Eth, Api::Personal, Api::Ethcore, Api::Traces, Api::Rpc]
 		},
 		_ => {
-			vec![Api::Web3, Api::Net, Api::Eth, Api::Personal, Api::Signer, Api::Ethcore, Api::EthcoreSet, Api::Traces, Api::Rpc]
+			vec![Api::Web3, Api::Net, Api::Eth, Api::Personal, Api::Signer, Api::Ethcore, Api::Traces, Api::Rpc]
 		},
 	}
 }
@@ -147,7 +147,7 @@ pub fn setup_rpc<T: Extendable>(server: T, deps: Arc<Dependencies>, apis: ApiSet
 				server.add_delegate(EthFilterClient::new(&deps.client, &deps.miner).to_delegate());
 
 				if deps.signer_port.is_some() {
-					server.add_delegate(EthSigningQueueClient::new(&deps.signer_queue).to_delegate());
+					server.add_delegate(EthSigningQueueClient::new(&deps.signer_queue, &deps.miner).to_delegate());
 				} else {
 					server.add_delegate(EthSigningUnsafeClient::new(&deps.client, &deps.secret_store, &deps.miner).to_delegate());
 				}

rpc/src/v1/impls/eth.rs

@@ -421,9 +421,15 @@ impl<C, S, A, M, EM> Eth for EthClient<C, S, A, M, EM> where
 	fn transaction_receipt(&self, params: Params) -> Result<Value, Error> {
 		from_params::<(H256,)>(params)
 			.and_then(|(hash,)| {
+				let miner = take_weak!(self.miner);
+				match miner.pending_receipts().get(&hash) {
+					Some(receipt) => to_value(&Receipt::from(receipt.clone())),
+					None => {
 						let client = take_weak!(self.client);
 						let receipt = client.transaction_receipt(TransactionID::Hash(hash));
 						to_value(&receipt.map(Receipt::from))
+					}
+				}
 			})
 	}
 

rpc/src/v1/impls/eth_signing.rs

@@ -24,25 +24,40 @@ use util::numbers::*;
 use util::keys::store::AccountProvider;
 use v1::helpers::{SigningQueue, ConfirmationsQueue};
 use v1::traits::EthSigning;
-use v1::types::TransactionRequest;
+use v1::types::{TransactionRequest, Bytes};
 use v1::impls::{sign_and_dispatch, error_codes};
 
 
 /// Implementation of functions that require signing when no trusted signer is used.
-pub struct EthSigningQueueClient {
+pub struct EthSigningQueueClient<M: MinerService> {
 	queue: Weak<ConfirmationsQueue>,
+	miner: Weak<M>,
 }
 
-impl EthSigningQueueClient {
+impl<M: MinerService> EthSigningQueueClient<M> {
 	/// Creates a new signing queue client given shared signing queue.
-	pub fn new(queue: &Arc<ConfirmationsQueue>) -> Self {
+	pub fn new(queue: &Arc<ConfirmationsQueue>, miner: &Arc<M>) -> Self {
 		EthSigningQueueClient {
 			queue: Arc::downgrade(queue),
-		}
+			miner: Arc::downgrade(miner),
 		}
 	}
 
-impl EthSigning for EthSigningQueueClient  {
+	fn fill_optional_fields(&self, miner: Arc<M>, mut request: TransactionRequest) -> TransactionRequest {
+		if let None = request.gas {
+			request.gas = Some(miner.sensible_gas_limit());
+		}
+		if let None = request.gas_price {
+			request.gas_price = Some(miner.sensible_gas_price());
+		}
+		if let None = request.data {
+			request.data = Some(Bytes::new(Vec::new()));
+		}
+		request
+	}
+}
+
+impl<M: MinerService + 'static> EthSigning for EthSigningQueueClient<M>  {
 
 	fn sign(&self, _params: Params) -> Result<Value, Error> {
 		warn!("Invoking eth_sign is not yet supported with signer enabled.");
@@ -54,6 +69,8 @@ impl EthSigning for EthSigningQueueClient  {
 		from_params::<(TransactionRequest, )>(params)
 			.and_then(|(request, )| {
 				let queue = take_weak!(self.queue);
+				let miner = take_weak!(self.miner);
+				let request = self.fill_optional_fields(miner, request);
 				let id = queue.add_request(request);
 				let result = id.wait_with_timeout();
 				result.unwrap_or_else(|| to_value(&H256::new()))

rpc/src/v1/impls/net.rs

@@ -47,4 +47,14 @@ impl<S> Net for NetClient<S> where S: SyncProvider + 'static {
 		// right now (11 march 2016), we are always listening for incoming connections
 		Ok(Value::Bool(true))
 	}
+
+	fn start_network(&self, _: Params) -> Result<Value, Error> {
+		take_weak!(self.sync).start_network();
+		Ok(Value::Bool(true))
+	}
+
+	fn stop_network(&self, _: Params) -> Result<Value, Error> {
+		take_weak!(self.sync).stop_network();
+		Ok(Value::Bool(true))
+	}
 }

rpc/src/v1/tests/helpers/sync_provider.rs

@@ -59,5 +59,11 @@ impl SyncProvider for TestSyncProvider {
 	fn status(&self) -> SyncStatus {
 		self.status.read().unwrap().clone()
 	}
+
+	fn start_network(&self) {
+	}
+
+	fn stop_network(&self) {
+	}
 }
 

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

@@ -19,21 +19,25 @@ use jsonrpc_core::IoHandler;
 use v1::impls::EthSigningQueueClient;
 use v1::traits::EthSigning;
 use v1::helpers::{ConfirmationsQueue, SigningQueue};
+use v1::tests::helpers::TestMinerService;
 use util::keys::TestAccount;
 
 struct EthSigningTester {
 	pub queue: Arc<ConfirmationsQueue>,
+	pub miner: Arc<TestMinerService>,
 	pub io: IoHandler,
 }
 
 impl Default for EthSigningTester {
 	fn default() -> Self {
 		let queue = Arc::new(ConfirmationsQueue::default());
+		let miner = Arc::new(TestMinerService::default());
 		let io = IoHandler::new();
-		io.add_delegate(EthSigningQueueClient::new(&queue).to_delegate());
+		io.add_delegate(EthSigningQueueClient::new(&queue, &miner).to_delegate());
 
 		EthSigningTester {
 			queue: queue,
+			miner: miner,
 			io: io,
 		}
 	}

rpc/src/v1/traits/net.rs

@@ -30,6 +30,12 @@ pub trait Net: Sized + Send + Sync + 'static {
 	/// Otherwise false.
 	fn is_listening(&self, _: Params) -> Result<Value, Error>;
 
+	/// Start the network.
+	fn start_network(&self, _: Params) -> Result<Value, Error>;
+
+	/// Stop the network.
+	fn stop_network(&self, _: Params) -> Result<Value, Error>;
+
 	/// Should be used to convert object to io delegate.
 	fn to_delegate(self) -> IoDelegate<Self> {
 		let mut delegate = IoDelegate::new(Arc::new(self));

rpc/src/v1/types/receipt.rs

@@ -17,23 +17,23 @@
 use util::numbers::U256;
 use util::hash::{Address, H256};
 use v1::types::Log;
-use ethcore::receipt::LocalizedReceipt;
+use ethcore::receipt::{Receipt as EthReceipt, LocalizedReceipt};
 
 /// Receipt
 #[derive(Debug, Serialize)]
 pub struct Receipt {
 	/// Transaction Hash
 	#[serde(rename="transactionHash")]
-	pub transaction_hash: H256,
+	pub transaction_hash: Option<H256>,
 	/// Transaction index
 	#[serde(rename="transactionIndex")]
-	pub transaction_index: U256,
+	pub transaction_index: Option<U256>,
 	/// Block hash
 	#[serde(rename="blockHash")]
-	pub block_hash: H256,
+	pub block_hash: Option<H256>,
 	/// Block number
 	#[serde(rename="blockNumber")]
-	pub block_number: U256,
+	pub block_number: Option<U256>,
 	/// Cumulative gas used
 	#[serde(rename="cumulativeGasUsed")]
 	pub cumulative_gas_used: U256,
@@ -50,10 +50,10 @@ pub struct Receipt {
 impl From<LocalizedReceipt> for Receipt {
 	fn from(r: LocalizedReceipt) -> Self {
 		Receipt {
-			transaction_hash: r.transaction_hash,
+			transaction_hash: Some(r.transaction_hash),
-			transaction_index: U256::from(r.transaction_index),
+			transaction_index: Some(U256::from(r.transaction_index)),
-			block_hash: r.block_hash,
+			block_hash: Some(r.block_hash),
-			block_number: U256::from(r.block_number),
+			block_number: Some(U256::from(r.block_number)),
 			cumulative_gas_used: r.cumulative_gas_used,
 			gas_used: r.gas_used,
 			contract_address: r.contract_address,
@@ -62,6 +62,21 @@ impl From<LocalizedReceipt> for Receipt {
 	}
 }
 
+impl From<EthReceipt> for Receipt {
+	fn from(r: EthReceipt) -> Self {
+		Receipt {
+			transaction_hash: None,
+			transaction_index: None,
+			block_hash: None,
+			block_number: None,
+			cumulative_gas_used: r.gas_used,
+			gas_used: r.gas_used,
+			contract_address: None,
+			logs: r.logs.into_iter().map(From::from).collect(),
+		}
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use serde_json;
@@ -74,10 +89,10 @@ mod tests {
 		let s = r#"{"transactionHash":"0x0000000000000000000000000000000000000000000000000000000000000000","transactionIndex":"0x00","blockHash":"0xed76641c68a1c641aee09a94b3b471f4dc0316efe5ac19cf488e2674cf8d05b5","blockNumber":"0x04510c","cumulativeGasUsed":"0x20","gasUsed":"0x10","contractAddress":null,"logs":[{"address":"0x33990122638b9132ca29c723bdf037f1a891a70c","topics":["0xa6697e974e6a320f454390be03f74955e8978f1a6971ea6730542e37b66179bc","0x4861736852656700000000000000000000000000000000000000000000000000"],"data":"0x","blockHash":"0xed76641c68a1c641aee09a94b3b471f4dc0316efe5ac19cf488e2674cf8d05b5","blockNumber":"0x04510c","transactionHash":"0x0000000000000000000000000000000000000000000000000000000000000000","transactionIndex":"0x00","logIndex":"0x01","type":"mined"}]}"#;
 
 		let receipt = Receipt {
-			transaction_hash: H256::zero(),
+			transaction_hash: Some(H256::zero()),
-			transaction_index: U256::zero(),
+			transaction_index: Some(U256::zero()),
-			block_hash: H256::from_str("ed76641c68a1c641aee09a94b3b471f4dc0316efe5ac19cf488e2674cf8d05b5").unwrap(),
+			block_hash: Some(H256::from_str("ed76641c68a1c641aee09a94b3b471f4dc0316efe5ac19cf488e2674cf8d05b5").unwrap()),
-			block_number: U256::from(0x4510c),
+			block_number: Some(U256::from(0x4510c)),
 			cumulative_gas_used: U256::from(0x20),
 			gas_used: U256::from(0x10),
 			contract_address: None,

sync/src/chain.rs

@@ -356,6 +356,10 @@ impl ChainSync {
 		};
 
 		trace!(target: "sync", "New peer {} (protocol: {}, network: {:?}, difficulty: {:?}, latest:{}, genesis:{})", peer_id, peer.protocol_version, peer.network_id, peer.difficulty, peer.latest_hash, peer.genesis);
+		if io.is_expired() {
+			trace!("Status packet from expired session {}:{}", peer_id, io.peer_info(peer_id));
+			return Ok(());
+		}
 
 		if self.peers.contains_key(&peer_id) {
 			warn!("Unexpected status packet from {}:{}", peer_id, io.peer_info(peer_id));
@@ -454,12 +458,21 @@ impl ChainSync {
 		// Disable the peer for this syncing round if it gives invalid chain
 		if !valid_response {
 			trace!(target: "sync", "{} Deactivated for invalid headers response", peer_id);
+<<<<<<< HEAD
 			self.deactivate_peer(io, peer_id); 
 		}
 		if headers.is_empty() && self.state == SyncState::ChainHead {
 			// Peer does not have any new subchain heads, deactivate it nd try with another
 			trace!(target: "sync", "{} Deactivated for no data", peer_id);
 			self.deactivate_peer(io, peer_id); 
+=======
+			self.deactivate_peer(io, peer_id);
+		}
+		if headers.is_empty() {
+			// Peer does not have any new subchain heads, deactivate it nd try with another
+			trace!(target: "sync", "{} Deactivated for no data", peer_id);
+			self.deactivate_peer(io, peer_id);
+>>>>>>> master
 		}
 		match self.state {
 			SyncState::ChainHead => {

sync/src/io.rs

@@ -41,6 +41,8 @@ pub trait SyncIo {
 	fn is_chain_queue_empty(&self) -> bool {
 		self.chain().queue_info().is_empty()
 	}
+	/// Check if the session is expired
+	fn is_expired(&self) -> bool;
 }
 
 /// Wraps `NetworkContext` and the blockchain client
@@ -83,6 +85,10 @@ impl<'s, 'h> SyncIo for NetSyncIo<'s, 'h> {
 	fn peer_info(&self, peer_id: PeerId) -> String {
 		self.network.peer_info(peer_id)
 	}
+
+	fn is_expired(&self) -> bool {
+		self.network.is_expired()
+	}
 }
 
 

sync/src/lib.rs

@@ -41,11 +41,13 @@
 //! use ethcore::miner::Miner;
 //!
 //! fn main() {
-//! 	let mut service = NetworkService::start(NetworkConfiguration::new()).unwrap();
+//! 	let mut service = NetworkService::new(NetworkConfiguration::new()).unwrap();
+//! 	service.start().unwrap();
 //! 	let dir = env::temp_dir();
 //! 	let client = Client::new(ClientConfig::default(), ethereum::new_frontier(), &dir, Arc::new(Miner::default()), service.io().channel()).unwrap();
 //! 	let miner = Miner::new(false, ethereum::new_frontier());
-//! 	EthSync::register(&mut service, SyncConfig::default(), client);
+//! 	let sync = EthSync::new(SyncConfig::default(), client);
+//! 	EthSync::register(&mut service, sync);
 //! }
 //! ```
 
@@ -66,8 +68,10 @@ use util::network::{NetworkProtocolHandler, NetworkService, NetworkContext, Peer
 use util::TimerToken;
 use util::{U256, ONE_U256};
 use ethcore::client::Client;
-use ethcore::service::SyncMessage;
+use ethcore::service::{SyncMessage, NetSyncMessage};
 use io::NetSyncIo;
+use util::io::IoChannel;
+use util::{NetworkIoMessage, NetworkError};
 use chain::ChainSync;
 
 mod chain;
@@ -98,6 +102,10 @@ impl Default for SyncConfig {
 pub trait SyncProvider: Send + Sync {
 	/// Get sync status
 	fn status(&self) -> SyncStatus;
+	/// Start the network
+	fn start_network(&self);
+	/// Stop the network
+	fn stop_network(&self);
 }
 
 /// Ethereum network protocol handler
@@ -105,23 +113,30 @@ pub struct EthSync {
 	/// Shared blockchain client. TODO: this should evetually become an IPC endpoint
 	chain: Arc<Client>,
 	/// Sync strategy
-	sync: RwLock<ChainSync>
+	sync: RwLock<ChainSync>,
+	/// IO communication chnnel.
+	io_channel: RwLock<IoChannel<NetSyncMessage>>,
 }
 
 pub use self::chain::{SyncStatus, SyncState};
 
 impl EthSync {
 	/// Creates and register protocol with the network service
-	pub fn register(service: &mut NetworkService<SyncMessage>, config: SyncConfig, chain: Arc<Client>) -> Arc<EthSync> {
+	pub fn new(config: SyncConfig, chain: Arc<Client>) -> Arc<EthSync> {
 		let sync = ChainSync::new(config, chain.deref());
 		let sync = Arc::new(EthSync {
 			chain: chain,
 			sync: RwLock::new(sync),
+			io_channel: RwLock::new(IoChannel::disconnected()),
 		});
-		service.register_protocol(sync.clone(), "eth", &[62u8, 63u8]).expect("Error registering eth protocol handler");
 		sync
 	}
 
+	/// Register protocol with the network service
+	pub fn register(service: &NetworkService<SyncMessage>, sync: Arc<EthSync>) -> Result<(), NetworkError> {
+		service.register_protocol(sync.clone(), "eth", &[62u8, 63u8])
+	}
+
 	/// Stop sync
 	pub fn stop(&mut self, io: &mut NetworkContext<SyncMessage>) {
 		self.sync.write().unwrap().abort(&mut NetSyncIo::new(io, self.chain.deref()));
@@ -138,11 +153,20 @@ impl SyncProvider for EthSync {
 	fn status(&self) -> SyncStatus {
 		self.sync.read().unwrap().status()
 	}
+
+	fn start_network(&self) {
+		self.io_channel.read().unwrap().send(NetworkIoMessage::User(SyncMessage::StartNetwork)).expect("Error sending IO notification");
+	}
+
+	fn stop_network(&self) {
+		self.io_channel.read().unwrap().send(NetworkIoMessage::User(SyncMessage::StopNetwork)).expect("Error sending IO notification");
+	}
 }
 
 impl NetworkProtocolHandler<SyncMessage> for EthSync {
 	fn initialize(&self, io: &NetworkContext<SyncMessage>) {
 		io.register_timer(0, 1000).expect("Error registering sync timer");
+		*self.io_channel.write().unwrap() = io.io_channel();
 	}
 
 	fn read(&self, io: &NetworkContext<SyncMessage>, peer: &PeerId, packet_id: u8, data: &[u8]) {

sync/src/tests/chain.rs

@@ -192,3 +192,13 @@ fn restart_on_broken_chain() {
 
 	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 5);
 }
+
+#[test]
+fn high_td_attach() {
+	let mut net = TestNet::new(2);
+	net.peer_mut(1).chain.add_blocks(10, EachBlockWith::Uncle);
+	net.peer_mut(1).chain.corrupt_block_parent(6);
+	net.sync_steps(20);
+
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 5);
+}

sync/src/tests/helpers.rs

@@ -43,6 +43,10 @@ impl<'p> SyncIo for TestIo<'p> {
 	fn disconnect_peer(&mut self, _peer_id: PeerId) {
 	}
 
+	fn is_expired(&self) -> bool {
+		false
+	}
+
 	fn respond(&mut self, packet_id: PacketId, data: Vec<u8>) -> Result<(), UtilError> {
 		self.queue.push_back(TestPacket {
 			data: data,

util/src/io/mod.rs

@@ -142,7 +142,7 @@ mod tests {
 
 	#[test]
 	fn test_service_register_handler () {
-		let mut service = IoService::<MyMessage>::start().expect("Error creating network service");
+		let service = IoService::<MyMessage>::start().expect("Error creating network service");
 		service.register_handler(Arc::new(MyHandler)).unwrap();
 	}
 

util/src/io/service.rs

@@ -18,9 +18,10 @@ use std::sync::*;
 use std::thread::{self, JoinHandle};
 use std::collections::HashMap;
 use mio::*;
+use crossbeam::sync::chase_lev;
+use slab::Slab;
 use error::*;
 use io::{IoError, IoHandler};
-use crossbeam::sync::chase_lev;
 use io::worker::{Worker, Work, WorkType};
 use panics::*;
 
@@ -33,6 +34,7 @@ pub type HandlerId = usize;
 
 /// Maximum number of tokens a handler can use
 pub const TOKENS_PER_HANDLER: usize = 16384;
+const MAX_HANDLERS: usize = 8;
 
 /// Messages used to communicate with the event loop from other threads.
 #[derive(Clone)]
@@ -43,6 +45,9 @@ pub enum IoMessage<Message> where Message: Send + Clone + Sized {
 	AddHandler {
 		handler: Arc<IoHandler<Message>+Send>,
 	},
+	RemoveHandler {
+		handler_id: HandlerId,
+	},
 	AddTimer {
 		handler_id: HandlerId,
 		token: TimerToken,
@@ -138,6 +143,15 @@ impl<Message> IoContext<Message> where Message: Send + Clone + 'static {
 	pub fn channel(&self) -> IoChannel<Message> {
 		self.channel.clone()
 	}
+
+	/// Unregister current IO handler.
+	pub fn unregister_handler(&self) -> Result<(), IoError> {
+		try!(self.channel.send_io(IoMessage::RemoveHandler {
+			handler_id: self.handler,
+		}));
+		Ok(())
+	}
+
 }
 
 #[derive(Clone)]
@@ -149,7 +163,7 @@ struct UserTimer {
 /// Root IO handler. Manages user handlers, messages and IO timers.
 pub struct IoManager<Message> where Message: Send + Sync {
 	timers: Arc<RwLock<HashMap<HandlerId, UserTimer>>>,
-	handlers: Vec<Arc<IoHandler<Message>>>,
+	handlers: Slab<Arc<IoHandler<Message>>, HandlerId>,
 	workers: Vec<Worker>,
 	worker_channel: chase_lev::Worker<Work<Message>>,
 	work_ready: Arc<Condvar>,
@@ -175,7 +189,7 @@ impl<Message> IoManager<Message> where Message: Send + Sync + Clone + 'static {
 
 		let mut io = IoManager {
 			timers: Arc::new(RwLock::new(HashMap::new())),
-			handlers: Vec::new(),
+			handlers: Slab::new(MAX_HANDLERS),
 			worker_channel: worker,
 			workers: workers,
 			work_ready: work_ready,
@@ -192,11 +206,7 @@ impl<Message> Handler for IoManager<Message> where Message: Send + Clone + Sync
 	fn ready(&mut self, _event_loop: &mut EventLoop<Self>, token: Token, events: EventSet) {
 		let handler_index  = token.as_usize() / TOKENS_PER_HANDLER;
 		let token_id  = token.as_usize() % TOKENS_PER_HANDLER;
-		if handler_index >= self.handlers.len() {
+		if let Some(handler) = self.handlers.get(handler_index) {
-			panic!("Unexpected stream token: {}", token.as_usize());
-		}
-		let handler = self.handlers[handler_index].clone();
-
 			if events.is_hup() {
 				self.worker_channel.push(Work { work_type: WorkType::Hup, token: token_id, handler: handler.clone(), handler_id: handler_index });
 			}
@@ -210,20 +220,19 @@ impl<Message> Handler for IoManager<Message> where Message: Send + Clone + Sync
 			}
 			self.work_ready.notify_all();
 		}
+	}
 
 	fn timeout(&mut self, event_loop: &mut EventLoop<Self>, token: Token) {
 		let handler_index  = token.as_usize()  / TOKENS_PER_HANDLER;
 		let token_id  = token.as_usize()  % TOKENS_PER_HANDLER;
-		if handler_index >= self.handlers.len() {
+		if let Some(handler) = self.handlers.get(handler_index) {
-			panic!("Unexpected timer token: {}", token.as_usize());
-		}
 			if let Some(timer) = self.timers.read().unwrap().get(&token.as_usize()) {
 				event_loop.timeout_ms(token, timer.delay).expect("Error re-registering user timer");
-			let handler = self.handlers[handler_index].clone();
+				self.worker_channel.push(Work { work_type: WorkType::Timeout, token: token_id, handler: handler.clone(), handler_id: handler_index });
-			self.worker_channel.push(Work { work_type: WorkType::Timeout, token: token_id, handler: handler, handler_id: handler_index });
 				self.work_ready.notify_all();
 			}
 		}
+	}
 
 	fn notify(&mut self, event_loop: &mut EventLoop<Self>, msg: Self::Message) {
 		match msg {
@@ -232,12 +241,13 @@ impl<Message> Handler for IoManager<Message> where Message: Send + Clone + Sync
 				event_loop.shutdown();
 			},
 			IoMessage::AddHandler { handler } => {
-				let handler_id = {
+				let handler_id = self.handlers.insert(handler.clone()).unwrap_or_else(|_| panic!("Too many handlers registered"));
-					self.handlers.push(handler.clone());
-					self.handlers.len() - 1
-				};
 				handler.initialize(&IoContext::new(IoChannel::new(event_loop.channel()), handler_id));
 			},
+			IoMessage::RemoveHandler { handler_id } => {
+				// TODO: flush event loop
+				self.handlers.remove(handler_id);
+			},
 			IoMessage::AddTimer { handler_id, token, delay } => {
 				let timer_id = token + handler_id * TOKENS_PER_HANDLER;
 				let timeout = event_loop.timeout_ms(Token(timer_id), delay).expect("Error registering user timer");
@@ -250,26 +260,32 @@ impl<Message> Handler for IoManager<Message> where Message: Send + Clone + Sync
 				}
 			},
 			IoMessage::RegisterStream { handler_id, token } => {
-				let handler = self.handlers.get(handler_id).expect("Unknown handler id").clone();
+				if let Some(handler) = self.handlers.get(handler_id) {
 					handler.register_stream(token, Token(token + handler_id * TOKENS_PER_HANDLER), event_loop);
+				}
 			},
 			IoMessage::DeregisterStream { handler_id, token } => {
-				let handler = self.handlers.get(handler_id).expect("Unknown handler id").clone();
+				if let Some(handler) = self.handlers.get(handler_id) {
 					handler.deregister_stream(token, event_loop);
 					// unregister a timer associated with the token (if any)
 					let timer_id = token + handler_id * TOKENS_PER_HANDLER;
 					if let Some(timer) = self.timers.write().unwrap().remove(&timer_id) {
 						event_loop.clear_timeout(timer.timeout);
 					}
+				}
 			},
 			IoMessage::UpdateStreamRegistration { handler_id, token } => {
-				let handler = self.handlers.get(handler_id).expect("Unknown handler id").clone();
+				if let Some(handler) = self.handlers.get(handler_id) {
 					handler.update_stream(token, Token(token + handler_id * TOKENS_PER_HANDLER), event_loop);
+				}
 			},
 			IoMessage::UserMessage(data) => {
-				for n in 0 .. self.handlers.len() {
+				//TODO: better way to iterate the slab
-					let handler = self.handlers[n].clone();
+				for id in 0 .. MAX_HANDLERS {
-					self.worker_channel.push(Work { work_type: WorkType::Message(data.clone()), token: 0, handler: handler, handler_id: n });
+					if let Some(h) = self.handlers.get(id) {
+						let handler = h.clone();
+						self.worker_channel.push(Work { work_type: WorkType::Message(data.clone()), token: 0, handler: handler, handler_id: id });
+					}
 				}
 				self.work_ready.notify_all();
 			}
@@ -351,8 +367,8 @@ impl<Message> IoService<Message> where Message: Send + Sync + Clone + 'static {
 		})
 	}
 
-	/// Regiter a IO hadnler with the event loop.
+	/// Regiter an IO handler with the event loop.
-	pub fn register_handler(&mut self, handler: Arc<IoHandler<Message>+Send>) -> Result<(), IoError> {
+	pub fn register_handler(&self, handler: Arc<IoHandler<Message>+Send>) -> Result<(), IoError> {
 		try!(self.host_channel.send(IoMessage::AddHandler {
 			handler: handler,
 		}));
@@ -360,13 +376,13 @@ impl<Message> IoService<Message> where Message: Send + Sync + Clone + 'static {
 	}
 
 	/// Send a message over the network. Normaly `HostIo::send` should be used. This can be used from non-io threads.
-	pub fn send_message(&mut self, message: Message) -> Result<(), IoError> {
+	pub fn send_message(&self, message: Message) -> Result<(), IoError> {
 		try!(self.host_channel.send(IoMessage::UserMessage(message)));
 		Ok(())
 	}
 
 	/// Create a new message channel
-	pub fn channel(&mut self) -> IoChannel<Message> {
+	pub fn channel(&self) -> IoChannel<Message> {
 		IoChannel { channel: Some(self.host_channel.clone()) }
 	}
 }

util/src/network/host.rs

@@ -18,7 +18,7 @@ use std::net::{SocketAddr};
 use std::collections::{HashMap};
 use std::str::{FromStr};
 use std::sync::*;
-use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
+use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering as AtomicOrdering};
 use std::ops::*;
 use std::cmp::min;
 use std::path::{Path, PathBuf};
@@ -50,7 +50,7 @@ const MAX_HANDSHAKES: usize = 80;
 const MAX_HANDSHAKES_PER_ROUND: usize = 32;
 const MAINTENANCE_TIMEOUT: u64 = 1000;
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 /// Network service configuration
 pub struct NetworkConfiguration {
 	/// Directory path to store network configuration. None means nothing will be saved
@@ -234,6 +234,11 @@ impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone
 		self.io.message(NetworkIoMessage::User(msg));
 	}
 
+	/// Send an IO message
+	pub fn io_channel(&self) -> IoChannel<NetworkIoMessage<Message>> {
+		self.io.channel()
+	}
+
 	/// Disable current protocol capability for given peer. If no capabilities left peer gets disconnected.
 	pub fn disable_peer(&self, peer: PeerId) {
 		//TODO: remove capability, disconnect if no capabilities left
@@ -245,6 +250,11 @@ impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone
 		self.io.message(NetworkIoMessage::Disconnect(peer));
 	}
 
+	/// Sheck if the session is till active.
+	pub fn is_expired(&self) -> bool {
+		self.session.as_ref().map(|s| s.lock().unwrap().expired()).unwrap_or(false)
+	}
+
 	/// Register a new IO timer. 'IoHandler::timeout' will be called with the token.
 	pub fn register_timer(&self, token: TimerToken, ms: u64) -> Result<(), UtilError> {
 		self.io.message(NetworkIoMessage::AddTimer {
@@ -324,11 +334,12 @@ pub struct Host<Message> where Message: Send + Sync + Clone {
 	stats: Arc<NetworkStats>,
 	pinned_nodes: Vec<NodeId>,
 	num_sessions: AtomicUsize,
+	stopping: AtomicBool,
 }
 
 impl<Message> Host<Message> where Message: Send + Sync + Clone {
 	/// Create a new instance
-	pub fn new(config: NetworkConfiguration) -> Result<Host<Message>, UtilError> {
+	pub fn new(config: NetworkConfiguration, stats: Arc<NetworkStats>) -> Result<Host<Message>, UtilError> {
 		let mut listen_address = match config.listen_address {
 			None => SocketAddr::from_str("0.0.0.0:30304").unwrap(),
 			Some(addr) => addr,
@@ -372,9 +383,10 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 			handlers: RwLock::new(HashMap::new()),
 			timers: RwLock::new(HashMap::new()),
 			timer_counter: RwLock::new(USER_TIMER),
-			stats: Arc::new(NetworkStats::default()),
+			stats: stats,
 			pinned_nodes: Vec::new(),
 			num_sessions: AtomicUsize::new(0),
+			stopping: AtomicBool::new(false),
 		};
 
 		let boot_nodes = host.info.read().unwrap().config.boot_nodes.clone();
@@ -384,10 +396,6 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		Ok(host)
 	}
 
-	pub fn stats(&self) -> Arc<NetworkStats> {
-		self.stats.clone()
-	}
-
 	pub fn add_node(&mut self, id: &str) {
 		match Node::from_str(id) {
 			Err(e) => { debug!(target: "network", "Could not add node {}: {:?}", id, e); },
@@ -402,8 +410,8 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	pub fn client_version(&self) -> String {
+	pub fn client_version() -> String {
-		self.info.read().unwrap().client_version.clone()
+		version()
 	}
 
 	pub fn external_url(&self) -> Option<String> {
@@ -416,6 +424,22 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		r
 	}
 
+	pub fn stop(&self, io: &IoContext<NetworkIoMessage<Message>>) -> Result<(), UtilError> {
+		self.stopping.store(true, AtomicOrdering::Release);
+		let mut to_kill = Vec::new();
+		for e in self.sessions.write().unwrap().iter_mut() {
+			let mut s = e.lock().unwrap();
+			s.disconnect(io, DisconnectReason::ClientQuit);
+			to_kill.push(s.token());
+		}
+		for p in to_kill {
+			trace!(target: "network", "Disconnecting on shutdown: {}", p);
+			self.kill_connection(p, io, true);
+		}
+		try!(io.unregister_handler());
+		Ok(())
+	}
+
 	fn init_public_interface(&self, io: &IoContext<NetworkIoMessage<Message>>) -> Result<(), UtilError> {
 		io.clear_timer(INIT_PUBLIC).unwrap();
 		if self.info.read().unwrap().public_endpoint.is_some() {
@@ -787,6 +811,9 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 	}
 
 	fn stream_readable(&self, io: &IoContext<NetworkIoMessage<Message>>, stream: StreamToken) {
+		if self.stopping.load(AtomicOrdering::Acquire) {
+			return;
+		}
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => self.session_readable(stream, io),
 			DISCOVERY => {
@@ -802,6 +829,9 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 	}
 
 	fn stream_writable(&self, io: &IoContext<NetworkIoMessage<Message>>, stream: StreamToken) {
+		if self.stopping.load(AtomicOrdering::Acquire) {
+			return;
+		}
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => self.session_writable(stream, io),
 			DISCOVERY => {
@@ -813,6 +843,9 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 	}
 
 	fn timeout(&self, io: &IoContext<NetworkIoMessage<Message>>, token: TimerToken) {
+		if self.stopping.load(AtomicOrdering::Acquire) {
+			return;
+		}
 		match token {
 			IDLE => self.maintain_network(io),
 			INIT_PUBLIC => self.init_public_interface(io).unwrap_or_else(|e|
@@ -844,6 +877,9 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 	}
 
 	fn message(&self, io: &IoContext<NetworkIoMessage<Message>>, message: &NetworkIoMessage<Message>) {
+		if self.stopping.load(AtomicOrdering::Acquire) {
+			return;
+		}
 		match *message {
 			NetworkIoMessage::AddHandler {
 				ref handler,
@@ -1009,6 +1045,6 @@ fn host_client_url() {
 	let mut config = NetworkConfiguration::new();
 	let key = h256_from_hex("6f7b0d801bc7b5ce7bbd930b84fd0369b3eb25d09be58d64ba811091046f3aa2");
 	config.use_secret = Some(key);
-	let host: Host<u32> = Host::new(config).unwrap();
+	let host: Host<u32> = Host::new(config, Arc::new(NetworkStats::new())).unwrap();
 	assert!(host.local_url().starts_with("enode://101b3ef5a4ea7a1c7928e24c4c75fd053c235d7b80c22ae5c03d145d0ac7396e2a4ffff9adee3133a7b05044a5cee08115fd65145e5165d646bde371010d803c@"));
 }

util/src/network/mod.rs

@@ -56,8 +56,9 @@
 //! }
 //!
 //! fn main () {
-//! 	let mut service = NetworkService::<MyMessage>::start(NetworkConfiguration::new_local()).expect("Error creating network service");
+//! 	let mut service = NetworkService::<MyMessage>::new(NetworkConfiguration::new_local()).expect("Error creating network service");
 //! 	service.register_protocol(Arc::new(MyHandler), "myproto", &[1u8]);
+//! 	service.start().expect("Error starting service");
 //!
 //! 	// Wait for quit condition
 //! 	// ...

util/src/network/service.rs

@@ -28,33 +28,33 @@ use io::*;
 pub struct NetworkService<Message> where Message: Send + Sync + Clone + 'static {
 	io_service: IoService<NetworkIoMessage<Message>>,
 	host_info: String,
-	host: Arc<Host<Message>>,
+	host: RwLock<Option<Arc<Host<Message>>>>,
 	stats: Arc<NetworkStats>,
-	panic_handler: Arc<PanicHandler>
+	panic_handler: Arc<PanicHandler>,
+	config: NetworkConfiguration,
 }
 
 impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'static {
 	/// Starts IO event loop
-	pub fn start(config: NetworkConfiguration) -> Result<NetworkService<Message>, UtilError> {
+	pub fn new(config: NetworkConfiguration) -> Result<NetworkService<Message>, UtilError> {
 		let panic_handler = PanicHandler::new_in_arc();
-		let mut io_service = try!(IoService::<NetworkIoMessage<Message>>::start());
+		let io_service = try!(IoService::<NetworkIoMessage<Message>>::start());
 		panic_handler.forward_from(&io_service);
 
-		let host = Arc::new(try!(Host::new(config)));
+		let stats = Arc::new(NetworkStats::new());
-		let stats = host.stats().clone();
+		let host_info = Host::<Message>::client_version();
-		let host_info = host.client_version();
-		try!(io_service.register_handler(host.clone()));
 		Ok(NetworkService {
 			io_service: io_service,
 			host_info: host_info,
 			stats: stats,
 			panic_handler: panic_handler,
-			host: host,
+			host: RwLock::new(None),
+			config: config,
 		})
 	}
 
 	/// Regiter a new protocol handler with the event loop.
-	pub fn register_protocol(&mut self, handler: Arc<NetworkProtocolHandler<Message>+Send + Sync>, protocol: ProtocolId, versions: &[u8]) -> Result<(), NetworkError> {
+	pub fn register_protocol(&self, handler: Arc<NetworkProtocolHandler<Message>+Send + Sync>, protocol: ProtocolId, versions: &[u8]) -> Result<(), NetworkError> {
 		try!(self.io_service.send_message(NetworkIoMessage::AddHandler {
 			handler: handler,
 			protocol: protocol,
@@ -69,8 +69,8 @@ impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'stat
 	}
 
 	/// Returns underlying io service.
-	pub fn io(&mut self) -> &mut IoService<NetworkIoMessage<Message>> {
+	pub fn io(&self) -> &IoService<NetworkIoMessage<Message>> {
-		&mut self.io_service
+		&self.io_service
 	}
 
 	/// Returns network statistics.
@@ -80,12 +80,36 @@ impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'stat
 
 	/// Returns external url if available.
 	pub fn external_url(&self) -> Option<String> {
-		self.host.external_url()
+		let host = self.host.read().unwrap();
+		host.as_ref().and_then(|h| h.external_url())
 	}
 
 	/// Returns external url if available.
-	pub fn local_url(&self) -> String {
+	pub fn local_url(&self) -> Option<String> {
-		self.host.local_url()
+		let host = self.host.read().unwrap();
+		host.as_ref().map(|h| h.local_url())
+	}
+
+	/// Start network IO
+	pub fn start(&self) -> Result<(), UtilError> {
+		let mut host = self.host.write().unwrap();
+		if host.is_none() {
+			let h = Arc::new(try!(Host::new(self.config.clone(), self.stats.clone())));
+			try!(self.io_service.register_handler(h.clone()));
+			*host = Some(h);
+		}
+		Ok(())
+	}
+
+	/// Stop network IO
+	pub fn stop(&self) -> Result<(), UtilError> {
+		let mut host = self.host.write().unwrap();
+		if let Some(ref host) = *host {
+			let io = IoContext::new(self.io_service.channel(), 0); //TODO: take token id from host
+			try!(host.stop(&io));
+		}
+		*host = None;
+		Ok(())
 	}
 }
 

util/src/network/stats.rs

@@ -65,7 +65,7 @@ impl NetworkStats {
 		self.sessions.load(Ordering::Relaxed)
 	}
 
-	#[cfg(test)]
+	/// Create a new empty instance.
 	pub fn new() -> NetworkStats {
 		NetworkStats {
 			recv: AtomicUsize::new(0),

util/src/network/tests.rs

@@ -97,7 +97,8 @@ impl NetworkProtocolHandler<TestProtocolMessage> for TestProtocol {
 
 #[test]
 fn net_service() {
-	let mut service = NetworkService::<TestProtocolMessage>::start(NetworkConfiguration::new_local()).expect("Error creating network service");
+	let service = NetworkService::<TestProtocolMessage>::new(NetworkConfiguration::new_local()).expect("Error creating network service");
+	service.start().unwrap();
 	service.register_protocol(Arc::new(TestProtocol::new(false)), "myproto", &[1u8]).unwrap();
 }
 
@@ -108,12 +109,14 @@ fn net_connect() {
 	let mut config1 = NetworkConfiguration::new_local();
 	config1.use_secret = Some(key1.secret().clone());
 	config1.boot_nodes = vec![ ];
-	let mut service1 = NetworkService::<TestProtocolMessage>::start(config1).unwrap();
+	let mut service1 = NetworkService::<TestProtocolMessage>::new(config1).unwrap();
+	service1.start().unwrap();
 	let handler1 = TestProtocol::register(&mut service1, false);
 	let mut config2 = NetworkConfiguration::new_local();
-	info!("net_connect: local URL: {}", service1.local_url());
+	info!("net_connect: local URL: {}", service1.local_url().unwrap());
-	config2.boot_nodes = vec![ service1.local_url() ];
+	config2.boot_nodes = vec![ service1.local_url().unwrap() ];
-	let mut service2 = NetworkService::<TestProtocolMessage>::start(config2).unwrap();
+	let mut service2 = NetworkService::<TestProtocolMessage>::new(config2).unwrap();
+	service2.start().unwrap();
 	let handler2 = TestProtocol::register(&mut service2, false);
 	while !handler1.got_packet() && !handler2.got_packet() && (service1.stats().sessions() == 0 || service2.stats().sessions() == 0) {
 		thread::sleep(Duration::from_millis(50));
@@ -122,17 +125,28 @@ fn net_connect() {
 	assert!(service2.stats().sessions() >= 1);
 }
 
+#[test]
+fn net_start_stop() {
+	let config = NetworkConfiguration::new_local();
+	let service = NetworkService::<TestProtocolMessage>::new(config).unwrap();
+	service.start().unwrap();
+	service.stop().unwrap();
+	service.start().unwrap();
+}
+
 #[test]
 fn net_disconnect() {
 	let key1 = KeyPair::create().unwrap();
 	let mut config1 = NetworkConfiguration::new_local();
 	config1.use_secret = Some(key1.secret().clone());
 	config1.boot_nodes = vec![ ];
-	let mut service1 = NetworkService::<TestProtocolMessage>::start(config1).unwrap();
+	let mut service1 = NetworkService::<TestProtocolMessage>::new(config1).unwrap();
+	service1.start().unwrap();
 	let handler1 = TestProtocol::register(&mut service1, false);
 	let mut config2 = NetworkConfiguration::new_local();
-	config2.boot_nodes = vec![ service1.local_url() ];
+	config2.boot_nodes = vec![ service1.local_url().unwrap() ];
-	let mut service2 = NetworkService::<TestProtocolMessage>::start(config2).unwrap();
+	let mut service2 = NetworkService::<TestProtocolMessage>::new(config2).unwrap();
+	service2.start().unwrap();
 	let handler2 = TestProtocol::register(&mut service2, true);
 	while !(handler1.got_disconnect() && handler2.got_disconnect()) {
 		thread::sleep(Duration::from_millis(50));
@@ -144,7 +158,8 @@ fn net_disconnect() {
 #[test]
 fn net_timeout() {
 	let config = NetworkConfiguration::new_local();
-	let mut service = NetworkService::<TestProtocolMessage>::start(config).unwrap();
+	let mut service = NetworkService::<TestProtocolMessage>::new(config).unwrap();
+	service.start().unwrap();
 	let handler = TestProtocol::register(&mut service, false);
 	while !handler.got_timeout() {
 		thread::sleep(Duration::from_millis(50));