Major sync <-> client interactions refactoring (#1572)

* chain notify trait

* replaced network service with io service

* fix ethcore crate warnings

* refactored network service without generic

* ethcore fix

* ethsync refactoring

* proper linking of notify

* manage network interface

* rpc crate rebinding

* full rewire

* sync internal io service

* fix deadlock

* fix warnings and removed async io

* sync imported message propagation

* fix rpc warnings

* binart warnings

* test fixes

* rpc mocks and tests

* fix util doctest

* fix message name and removed empty notifier

* pointers mess & dark mode fixed

* fixed sync doctest

* added few warnings

* fix review

* new convention match

* fix error unwraps

* doctest fix

ethcore/src/block_queue.rs

@@ -104,7 +104,7 @@ struct VerifyingBlock {
 struct QueueSignal {
 	deleting: Arc<AtomicBool>,
 	signalled: AtomicBool,
-	message_channel: IoChannel<NetSyncMessage>,
+	message_channel: IoChannel<ClientIoMessage>,
 }
 
 impl QueueSignal {
@@ -116,7 +116,7 @@ impl QueueSignal {
 		}
 
 		if self.signalled.compare_and_swap(false, true, AtomicOrdering::Relaxed) == false {
-			if let Err(e) = self.message_channel.send(UserMessage(SyncMessage::BlockVerified)) {
+			if let Err(e) = self.message_channel.send(ClientIoMessage::BlockVerified) {
 				debug!("Error sending BlockVerified message: {:?}", e);
 			}
 		}
@@ -137,7 +137,7 @@ struct Verification {
 
 impl BlockQueue {
 	/// Creates a new queue instance.
-	pub fn new(config: BlockQueueConfig, engine: Arc<Box<Engine>>, message_channel: IoChannel<NetSyncMessage>) -> BlockQueue {
+	pub fn new(config: BlockQueueConfig, engine: Arc<Box<Engine>>, message_channel: IoChannel<ClientIoMessage>) -> BlockQueue {
 		let verification = Arc::new(Verification {
 			unverified: Mutex::new(VecDeque::new()),
 			verified: Mutex::new(VecDeque::new()),

ethcore/src/client/chain_notify.rs

@@ -0,0 +1,40 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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 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.  If not, see <http://www.gnu.org/licenses/>.
+
+use util::numbers::*;
+
+/// Represents what has to be handled by actor listening to chain events
+pub trait ChainNotify : Send + Sync {
+	/// fires when chain has new blocks
+	fn new_blocks(&self,
+		_imported: Vec<H256>,
+		_invalid: Vec<H256>,
+		_enacted: Vec<H256>,
+		_retracted: Vec<H256>,
+		_sealed: Vec<H256>) {
+		// does nothing by default
+	}
+
+	/// fires when chain achieves active mode
+	fn start(&self) {
+		// does nothing by default
+	}
+
+	/// fires when chain achieves passive mode
+	fn stop(&self) {
+		// does nothing by default
+	}
+}

ethcore/src/client/client.rs

@@ -28,7 +28,6 @@ use std::time::Instant;
 // util
 use util::numbers::*;
 use util::panics::*;
-use util::network::*;
 use util::io::*;
 use util::rlp;
 use util::sha3::*;
@@ -47,7 +46,7 @@ use state::State;
 use spec::Spec;
 use engine::Engine;
 use views::HeaderView;
-use service::{NetSyncMessage, SyncMessage};
+use service::ClientIoMessage;
 use env_info::LastHashes;
 use verification;
 use verification::{PreverifiedBlock, Verifier};
@@ -60,7 +59,7 @@ use block_queue::{BlockQueue, BlockQueueInfo};
 use blockchain::{BlockChain, BlockProvider, TreeRoute, ImportRoute};
 use client::{BlockID, TransactionID, UncleID, TraceId, ClientConfig,
 	DatabaseCompactionProfile, BlockChainClient, MiningBlockChainClient,
-	TraceFilter, CallAnalytics, BlockImportError, Mode};
+	TraceFilter, CallAnalytics, BlockImportError, Mode, ChainNotify};
 use client::Error as ClientError;
 use env_info::EnvInfo;
 use executive::{Executive, Executed, TransactOptions, contract_address};
@@ -141,7 +140,8 @@ pub struct Client {
 	miner: Arc<Miner>,
 	sleep_state: Mutex<SleepState>,
 	liveness: AtomicBool,
-	io_channel: IoChannel<NetSyncMessage>,
+	io_channel: IoChannel<ClientIoMessage>,
+	notify: RwLock<Option<Weak<ChainNotify>>>,
 	queue_transactions: AtomicUsize,
 	previous_enode: Mutex<Option<String>>,
 }
@@ -178,7 +178,7 @@ impl Client {
 		spec: Spec,
 		path: &Path,
 		miner: Arc<Miner>,
-		message_channel: IoChannel<NetSyncMessage>
+		message_channel: IoChannel<ClientIoMessage>,
 	) -> Result<Arc<Client>, ClientError> {
 		let path = get_db_path(path, config.pruning, spec.genesis_header().hash());
 		let gb = spec.genesis_block();
@@ -228,12 +228,24 @@ impl Client {
 			trie_factory: TrieFactory::new(config.trie_spec),
 			miner: miner,
 			io_channel: message_channel,
+			notify: RwLock::new(None),
 			queue_transactions: AtomicUsize::new(0),
 			previous_enode: Mutex::new(None),
 		};
 		Ok(Arc::new(client))
 	}
 
+	/// Sets the actor to be notified on certain events
+	pub fn set_notify(&self, target: &Arc<ChainNotify>) {
+		let mut write_lock = self.notify.unwrapped_write();
+		*write_lock = Some(Arc::downgrade(target));
+	}
+
+	fn notify(&self) -> Option<Arc<ChainNotify>> {
+		let read_lock = self.notify.unwrapped_read();
+		read_lock.as_ref().and_then(|weak| weak.upgrade())
+	}
+
 	/// Flush the block import queue.
 	pub fn flush_queue(&self) {
 		self.block_queue.flush();
@@ -327,9 +339,9 @@ impl Client {
 	}
 
 	/// This is triggered by a message coming from a block queue when the block is ready for insertion
-	pub fn import_verified_blocks(&self, io: &IoChannel<NetSyncMessage>) -> usize {
+	pub fn import_verified_blocks(&self, io: &IoChannel<ClientIoMessage>) -> usize {
 		let max_blocks_to_import = 64;
-
+		let (imported_blocks, import_results, invalid_blocks, original_best, imported) = {
 			let mut imported_blocks = Vec::with_capacity(max_blocks_to_import);
 			let mut invalid_blocks = HashSet::new();
 			let mut import_results = Vec::with_capacity(max_blocks_to_import);
@@ -373,6 +385,8 @@ impl Client {
 					self.block_queue.mark_as_good(&imported_blocks);
 				}
 			}
+			(imported_blocks, import_results, invalid_blocks, original_best, imported)
+		};
 
 		{
 			if !imported_blocks.is_empty() && self.block_queue.queue_info().is_empty() {
@@ -382,13 +396,15 @@ impl Client {
 					self.miner.chain_new_blocks(self, &imported_blocks, &invalid_blocks, &enacted, &retracted);
 				}
 
-				io.send(NetworkIoMessage::User(SyncMessage::NewChainBlocks {
+				if let Some(notify) = self.notify() {
-					imported: imported_blocks,
+					notify.new_blocks(
-					invalid: invalid_blocks,
+						imported_blocks,
-					enacted: enacted,
+						invalid_blocks,
-					retracted: retracted,
+						enacted,
-					sealed: Vec::new(),
+						retracted,
-				})).unwrap_or_else(|e| warn!("Error sending IO notification: {:?}", e));
+						Vec::new(),
+					);
+				}
 			}
 		}
 
@@ -566,7 +582,9 @@ impl Client {
 	fn wake_up(&self) {
 		if !self.liveness.load(AtomicOrdering::Relaxed) {
 			self.liveness.store(true, AtomicOrdering::Relaxed);
-			self.io_channel.send(NetworkIoMessage::User(SyncMessage::StartNetwork)).unwrap();
+			if let Some(notify) = self.notify() {
+				notify.start();
+			}
 			trace!(target: "mode", "wake_up: Waking.");
 		}
 	}
@@ -576,7 +594,9 @@ impl Client {
 			// only sleep if the import queue is mostly empty.
 			if self.queue_info().total_queue_size() <= MAX_QUEUE_SIZE_TO_SLEEP_ON {
 				self.liveness.store(false, AtomicOrdering::Relaxed);
-				self.io_channel.send(NetworkIoMessage::User(SyncMessage::StopNetwork)).unwrap();
+				if let Some(notify) = self.notify() {
+					notify.stop();
+				}
 				trace!(target: "mode", "sleep: Sleeping.");
 			} else {
 				trace!(target: "mode", "sleep: Cannot sleep - syncing ongoing.");
@@ -901,7 +921,7 @@ impl BlockChainClient for Client {
 			debug!("Ignoring {} transactions: queue is full", transactions.len());
 		} else {
 			let len = transactions.len();
-			match self.io_channel.send(NetworkIoMessage::User(SyncMessage::NewTransactions(transactions))) {
+			match self.io_channel.send(ClientIoMessage::NewTransactions(transactions)) {
 				Ok(_) => {
 					self.queue_transactions.fetch_add(len, AtomicOrdering::SeqCst);
 				}
@@ -969,13 +989,15 @@ impl MiningBlockChainClient for Client {
 			let (enacted, retracted) = self.calculate_enacted_retracted(&[route]);
 			self.miner.chain_new_blocks(self, &[h.clone()], &[], &enacted, &retracted);
 
-			self.io_channel.send(NetworkIoMessage::User(SyncMessage::NewChainBlocks {
+			if let Some(notify) = self.notify() {
-				imported: vec![h.clone()],
+				notify.new_blocks(
-				invalid: vec![],
+					vec![h.clone()],
-				enacted: enacted,
+					vec![],
-				retracted: retracted,
+					enacted,
-				sealed: vec![h.clone()],
+					retracted,
-			})).unwrap_or_else(|e| warn!("Error sending IO notification: {:?}", e));
+					vec![h.clone()],
+				);
+			}
 		}
 
 		if self.chain_info().best_block_hash != original_best {

ethcore/src/client/mod.rs

@@ -20,6 +20,7 @@ mod config;
 mod error;
 mod test_client;
 mod trace;
+mod chain_notify;
 
 pub use self::client::*;
 pub use self::config::{Mode, ClientConfig, DatabaseCompactionProfile, BlockQueueConfig, BlockChainConfig, Switch, VMType};
@@ -29,6 +30,7 @@ pub use self::test_client::{TestBlockChainClient, EachBlockWith};
 pub use types::trace_filter::Filter as TraceFilter;
 pub use executive::{Executed, Executive, TransactOptions};
 pub use env_info::{LastHashes, EnvInfo};
+pub use self::chain_notify::ChainNotify;
 
 use util::bytes::Bytes;
 use util::hash::{Address, H256, H2048};

ethcore/src/service.rs

@@ -20,67 +20,50 @@ use util::*;
 use util::panics::*;
 use spec::Spec;
 use error::*;
-use client::{Client, ClientConfig};
+use client::{Client, ClientConfig, ChainNotify};
 use miner::Miner;
 
 /// Message type for external and internal events
 #[derive(Clone)]
-pub enum SyncMessage {
+pub enum ClientIoMessage {
-	/// New block has been imported into the blockchain
-	NewChainBlocks {
-		/// Hashes of blocks imported to blockchain
-		imported: Vec<H256>,
-		/// Hashes of blocks not imported to blockchain (because were invalid)
-		invalid: Vec<H256>,
-		/// Hashes of blocks that were removed from canonical chain
-		retracted: Vec<H256>,
-		/// Hashes of blocks that are now included in cannonical chain
-		enacted: Vec<H256>,
-		/// Hashes of blocks that are sealed by this node
-		sealed: Vec<H256>,
-	},
 	/// Best Block Hash in chain has been changed
 	NewChainHead,
 	/// A block is ready
 	BlockVerified,
 	/// New transaction RLPs are ready to be imported
 	NewTransactions(Vec<Bytes>),
-	/// Start network command.
-	StartNetwork,
-	/// Stop network command.
-	StopNetwork,
 }
 
-/// IO Message type used for Network service
-pub type NetSyncMessage = NetworkIoMessage<SyncMessage>;
-
 /// Client service setup. Creates and registers client and network services with the IO subsystem.
 pub struct ClientService {
-	net_service: Arc<NetworkService<SyncMessage>>,
+	io_service: Arc<IoService<ClientIoMessage>>,
 	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>, enable_network: bool) -> Result<ClientService, Error> {
+	pub fn start(
+		config: ClientConfig,
+		spec: Spec,
+		db_path: &Path,
+		miner: Arc<Miner>,
+		) -> Result<ClientService, Error>
+	{
 		let panic_handler = PanicHandler::new_in_arc();
-		let net_service = try!(NetworkService::new(net_config));
+		let io_service = try!(IoService::<ClientIoMessage>::start());
-		panic_handler.forward_from(&net_service);
+		panic_handler.forward_from(&io_service);
-		if enable_network {
-			try!(net_service.start());
-		}
 
 		info!("Configured for {} using {} engine", spec.name.clone().apply(Colour::White.bold()), spec.engine.name().apply(Colour::Yellow.bold()));
-		let client = try!(Client::new(config, spec, db_path, miner, net_service.io().channel()));
+		let client = try!(Client::new(config, spec, db_path, miner, io_service.channel()));
 		panic_handler.forward_from(client.deref());
 		let client_io = Arc::new(ClientIoHandler {
 			client: client.clone()
 		});
-		try!(net_service.io().register_handler(client_io));
+		try!(io_service.register_handler(client_io));
 
 		Ok(ClientService {
-			net_service: Arc::new(net_service),
+			io_service: Arc::new(io_service),
 			client: client,
 			panic_handler: panic_handler,
 		})
@@ -92,8 +75,8 @@ impl ClientService {
 	}
 
 	/// Get general IO interface
-	pub fn register_io_handler(&self, handler: Arc<IoHandler<NetSyncMessage> + Send>) -> Result<(), IoError> {
+	pub fn register_io_handler(&self, handler: Arc<IoHandler<ClientIoMessage> + Send>) -> Result<(), IoError> {
-		self.net_service.io().register_handler(handler)
+		self.io_service.register_handler(handler)
 	}
 
 	/// Get client interface
@@ -102,8 +85,13 @@ impl ClientService {
 	}
 
 	/// Get network service component
-	pub fn network(&mut self) -> Arc<NetworkService<SyncMessage>> {
+	pub fn io(&self) -> Arc<IoService<ClientIoMessage>> {
-		self.net_service.clone()
+		self.io_service.clone()
+	}
+
+	/// Set the actor to be notified on certain chain events
+	pub fn set_notify(&self, notify: &Arc<ChainNotify>) {
+		self.client.set_notify(notify);
 	}
 }
 
@@ -121,26 +109,22 @@ struct ClientIoHandler {
 const CLIENT_TICK_TIMER: TimerToken = 0;
 const CLIENT_TICK_MS: u64 = 5000;
 
-impl IoHandler<NetSyncMessage> for ClientIoHandler {
+impl IoHandler<ClientIoMessage> for ClientIoHandler {
-	fn initialize(&self, io: &IoContext<NetSyncMessage>) {
+	fn initialize(&self, io: &IoContext<ClientIoMessage>) {
 		io.register_timer(CLIENT_TICK_TIMER, CLIENT_TICK_MS).expect("Error registering client timer");
 	}
 
-	fn timeout(&self, _io: &IoContext<NetSyncMessage>, timer: TimerToken) {
+	fn timeout(&self, _io: &IoContext<ClientIoMessage>, timer: TimerToken) {
 		if timer == CLIENT_TICK_TIMER {
 			self.client.tick();
 		}
 	}
 
 	#[cfg_attr(feature="dev", allow(single_match))]
-	fn message(&self, io: &IoContext<NetSyncMessage>, net_message: &NetSyncMessage) {
+	fn message(&self, io: &IoContext<ClientIoMessage>, net_message: &ClientIoMessage) {
 		match *net_message {
-			UserMessage(ref message) => match *message {
+			ClientIoMessage::BlockVerified => { self.client.import_verified_blocks(&io.channel()); }
-				SyncMessage::BlockVerified => { self.client.import_verified_blocks(&io.channel()); }
+			ClientIoMessage::NewTransactions(ref transactions) => { self.client.import_queued_transactions(&transactions); }
-				SyncMessage::NewTransactions(ref transactions) => { self.client.import_queued_transactions(&transactions); }
-				_ => {} // ignore other messages
-			},
-			NetworkIoMessage::NetworkStarted(ref url) => { self.client.network_started(url); }
 			_ => {} // ignore other messages
 		}
 	}
@@ -150,7 +134,6 @@ impl IoHandler<NetSyncMessage> for ClientIoHandler {
 mod tests {
 	use super::*;
 	use tests::helpers::*;
-	use util::network::*;
 	use devtools::*;
 	use client::ClientConfig;
 	use std::sync::Arc;
@@ -162,10 +145,8 @@ mod tests {
 		let service = ClientService::start(
 			ClientConfig::default(),
 			get_test_spec(),
-			NetworkConfiguration::new_local(),
 			&temp_path.as_path(),
 			Arc::new(Miner::with_spec(get_test_spec())),
-			false
 		);
 		assert!(service.is_ok());
 	}

parity/informant.rs

@@ -21,8 +21,8 @@ use self::ansi_term::Style;
 use std::time::{Instant, Duration};
 use std::sync::RwLock;
 use std::ops::{Deref, DerefMut};
-use ethsync::{EthSync, SyncProvider};
+use ethsync::SyncStatus;
-use util::{Uint, RwLockable, NetworkService};
+use util::{Uint, RwLockable, NetworkConfiguration};
 use ethcore::client::*;
 use number_prefix::{binary_prefix, Standalone, Prefixed};
 
@@ -75,7 +75,8 @@ impl Informant {
 		}
 	}
 
-	pub fn tick<Message>(&self, client: &Client, maybe_sync: Option<(&EthSync, &NetworkService<Message>)>) where Message: Send + Sync + Clone + 'static {
+	#[cfg_attr(feature="dev", allow(match_bool))]
+	pub fn tick(&self, client: &Client, maybe_status: Option<(SyncStatus, NetworkConfiguration)>) {
 		let elapsed = self.last_tick.unwrapped_read().elapsed();
 		if elapsed < Duration::from_secs(5) {
 			return;
@@ -108,10 +109,8 @@ impl Informant {
 				paint(Yellow.bold(), format!("{:4}", ((report.transactions_applied - last_report.transactions_applied) * 1000) as u64 / elapsed.as_milliseconds())),
 				paint(Yellow.bold(), format!("{:3}", ((report.gas_processed - last_report.gas_processed) / From::from(elapsed.as_milliseconds() * 1000)).low_u64())),
 
-				match maybe_sync {
+				match maybe_status {
-					Some((sync, net)) => {
+					Some((ref sync_info, ref net_config)) => {
-						let sync_info = sync.status();
-						let net_config = net.config();
 						format!("{}/{}/{} peers   {} ",
 							paint(Green.bold(), format!("{:2}", sync_info.num_active_peers)),
 							paint(Green.bold(), format!("{:2}", sync_info.num_peers)),
@@ -128,13 +127,9 @@ impl Informant {
 				paint(Purple.bold(), format!("{:>8}", Informant::format_bytes(report.state_db_mem))),
 				paint(Purple.bold(), format!("{:>8}", Informant::format_bytes(cache_info.total()))),
 				paint(Purple.bold(), format!("{:>8}", Informant::format_bytes(queue_info.mem_used))),
-				match maybe_sync {
+				if let Some((ref sync_info, _)) = maybe_status {
-					Some((sync, _)) => {
-						let sync_info = sync.status();
 					format!(" {} sync", paint(Purple.bold(), format!("{:>8}", Informant::format_bytes(sync_info.mem_used))))
-					}
+				} else { String::new() },
-					None => String::new()
-				},
 			);
 		}
 

parity/io_handler.rs

@@ -14,12 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::sync::{Arc, Weak};
+use std::sync::Arc;
 use ethcore::client::Client;
-use ethcore::service::{NetSyncMessage, SyncMessage};
+use ethcore::service::ClientIoMessage;
-use ethsync::EthSync;
+use ethsync::{EthSync, SyncProvider, ManageNetwork};
 use ethcore::account_provider::AccountProvider;
-use util::{TimerToken, IoHandler, IoContext, NetworkService, NetworkIoMessage};
+use util::{TimerToken, IoHandler, IoContext};
 
 use informant::Informant;
 
@@ -30,38 +30,18 @@ pub struct ClientIoHandler {
 	pub sync: Arc<EthSync>,
 	pub accounts: Arc<AccountProvider>,
 	pub info: Informant,
-	pub network: Weak<NetworkService<SyncMessage>>,
 }
 
-impl IoHandler<NetSyncMessage> for ClientIoHandler {
+impl IoHandler<ClientIoMessage> for ClientIoHandler {
-	fn initialize(&self, io: &IoContext<NetSyncMessage>) {
+	fn initialize(&self, io: &IoContext<ClientIoMessage>) {
 		io.register_timer(INFO_TIMER, 5000).expect("Error registering timer");
 	}
 
-	fn timeout(&self, _io: &IoContext<NetSyncMessage>, timer: TimerToken) {
+	fn timeout(&self, _io: &IoContext<ClientIoMessage>, timer: TimerToken) {
 		if let INFO_TIMER = timer {
-			if let Some(net) = self.network.upgrade() {
+			let sync_status = self.sync.status();
-				self.info.tick(&self.client, Some((&self.sync, &net)));
+			let network_config = self.sync.network_config();
+			self.info.tick(&self.client, Some((sync_status, network_config)));
 		}
 	}
 }
-
-	fn message(&self, _io: &IoContext<NetSyncMessage>, message: &NetSyncMessage) {
-		match *message {
-			NetworkIoMessage::User(SyncMessage::StartNetwork) => {
-				if let Some(network) = self.network.upgrade() {
-					network.start().unwrap_or_else(|e| warn!("Error starting network: {:?}", e));
-					EthSync::register(&*network, self.sync.clone()).unwrap_or_else(|e| warn!("Error registering eth protocol handler: {}", e));
-				}
-			},
-			NetworkIoMessage::User(SyncMessage::StopNetwork) => {
-				if let Some(network) = self.network.upgrade() {
-					network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
-				}
-			},
-			_ => {/* Ignore other messages */},
-		}
-	}
-}
-
-

parity/main.rs

@@ -81,9 +81,10 @@ use std::thread::sleep;
 use std::time::Duration;
 use rustc_serialize::hex::FromHex;
 use ctrlc::CtrlC;
-use util::{Lockable, H256, ToPretty, NetworkConfiguration, PayloadInfo, Bytes, UtilError, Colour, Applyable, version, journaldb};
+use util::{Lockable, H256, ToPretty, PayloadInfo, Bytes, Colour, Applyable, version, journaldb};
 use util::panics::{MayPanic, ForwardPanic, PanicHandler};
-use ethcore::client::{Mode, BlockID, BlockChainClient, ClientConfig, get_db_path, BlockImportError};
+use ethcore::client::{BlockID, BlockChainClient, ClientConfig, get_db_path, BlockImportError,
+	ChainNotify, Mode};
 use ethcore::error::{ImportError};
 use ethcore::service::ClientService;
 use ethcore::spec::Spec;
@@ -231,13 +232,11 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 	miner.set_transactions_limit(conf.args.flag_tx_queue_size);
 
 	// Build client
-	let mut service = ClientService::start(
+	let  service = ClientService::start(
 		client_config,
 		spec,
-		net_settings,
 		Path::new(&conf.path()),
 		miner.clone(),
-		match conf.mode() { Mode::Dark(..) => false, _ => !conf.args.flag_no_network }
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);
@@ -247,8 +246,14 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 	let network_settings = Arc::new(conf.network_settings());
 
 	// Sync
-	let sync = EthSync::new(sync_config, client.clone());
+	let sync = EthSync::new(sync_config, client.clone(), net_settings)
-	EthSync::register(&*service.network(), sync.clone()).unwrap_or_else(|e| die_with_error("Error registering eth protocol handler", UtilError::from(e).into()));
+		.unwrap_or_else(|e| die_with_error("Sync", ethcore::error::Error::Util(e)));
+	service.set_notify(&(sync.clone() as Arc<ChainNotify>));
+
+	// if network is active by default
+	if match conf.mode() { Mode::Dark(..) => false, _ => !conf.args.flag_no_network } {
+		sync.start();
+	}
 
 	let deps_for_rpc_apis = Arc::new(rpc_apis::Dependencies {
 		signer_port: conf.signer_port(),
@@ -261,7 +266,7 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 		logger: logger.clone(),
 		settings: network_settings.clone(),
 		allow_pending_receipt_query: !conf.args.flag_geth,
-		net_service: service.network(),
+		net_service: sync.clone(),
 	});
 
 	let dependencies = rpc::Dependencies {
@@ -311,7 +316,6 @@ fn execute_client(conf: Configuration, spec: Spec, client_config: ClientConfig)
 		info: Informant::new(conf.have_color()),
 		sync: sync.clone(),
 		accounts: account_service.clone(),
-		network: Arc::downgrade(&service.network()),
 	});
 	service.register_io_handler(io_handler).expect("Error registering IO handler");
 
@@ -345,24 +349,11 @@ fn execute_export(conf: Configuration) {
 	unsafe { ::fdlimit::raise_fd_limit(); }
 
 	let spec = conf.spec();
-	let net_settings = NetworkConfiguration {
-		config_path: None,
-		listen_address: None,
-		public_address: None,
-		udp_port: None,
-		nat_enabled: false,
-		discovery_enabled: false,
-		boot_nodes: Vec::new(),
-		use_secret: None,
-		ideal_peers: 0,
-		reserved_nodes: Vec::new(),
-		non_reserved_mode: ::util::network::NonReservedPeerMode::Accept,
-	};
 	let client_config = conf.client_config(&spec);
 
 	// Build client
 	let service = ClientService::start(
-		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::with_spec(conf.spec())), false
+		client_config, spec, Path::new(&conf.path()), Arc::new(Miner::with_spec(conf.spec()))
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);
@@ -419,24 +410,11 @@ fn execute_import(conf: Configuration) {
 	unsafe { ::fdlimit::raise_fd_limit(); }
 
 	let spec = conf.spec();
-	let net_settings = NetworkConfiguration {
-		config_path: None,
-		listen_address: None,
-		public_address: None,
-		udp_port: None,
-		nat_enabled: false,
-		discovery_enabled: false,
-		boot_nodes: Vec::new(),
-		use_secret: None,
-		ideal_peers: 0,
-		reserved_nodes: Vec::new(),
-		non_reserved_mode: ::util::network::NonReservedPeerMode::Accept,
-	};
 	let client_config = conf.client_config(&spec);
 
 	// Build client
 	let service = ClientService::start(
-		client_config, spec, net_settings, Path::new(&conf.path()), Arc::new(Miner::with_spec(conf.spec())), false
+		client_config, spec, Path::new(&conf.path()), Arc::new(Miner::with_spec(conf.spec()))
 	).unwrap_or_else(|e| die_with_error("Client", e));
 
 	panic_handler.forward_from(&service);
@@ -485,7 +463,7 @@ fn execute_import(conf: Configuration) {
 			Err(BlockImportError::Import(ImportError::AlreadyInChain)) => { trace!("Skipping block already in chain."); }
 			Err(e) => die!("Cannot import block: {:?}", e)
 		}
-		informant.tick::<&'static ()>(client.deref(), None);
+		informant.tick(client.deref(), None);
 	};
 
 	match format {

parity/rpc_apis.rs

@@ -18,13 +18,12 @@ use std::collections::BTreeMap;
 use std::str::FromStr;
 use std::sync::Arc;
 
-use ethsync::EthSync;
+use ethsync::{EthSync, ManageNetwork};
 use ethcore::miner::{Miner, ExternalMiner};
 use ethcore::client::Client;
 use util::RotatingLogger;
 use ethcore::account_provider::AccountProvider;
 use util::network_settings::NetworkSettings;
-use util::network::NetworkService;
 
 #[cfg(feature="rpc")]
 pub use ethcore_rpc::ConfirmationsQueue;
@@ -89,7 +88,7 @@ pub struct Dependencies {
 	pub logger: Arc<RotatingLogger>,
 	pub settings: Arc<NetworkSettings>,
 	pub allow_pending_receipt_query: bool,
-	pub net_service: Arc<NetworkService<::ethcore::service::SyncMessage>>,
+	pub net_service: Arc<ManageNetwork>,
 }
 
 fn to_modules(apis: &[Api]) -> BTreeMap<String, String> {

rpc/src/v1/impls/ethcore_set.rs

@@ -19,26 +19,26 @@ use std::sync::{Arc, Weak};
 use jsonrpc_core::*;
 use ethcore::miner::MinerService;
 use ethcore::client::MiningBlockChainClient;
-use ethcore::service::SyncMessage;
+use ethsync::ManageNetwork;
-use util::network::{NetworkService, NonReservedPeerMode};
+use util::network::NonReservedPeerMode;
 use v1::traits::EthcoreSet;
 use v1::types::{Bytes, H160, U256};
 
 /// Ethcore-specific rpc interface for operations altering the settings.
 pub struct EthcoreSetClient<C, M> where
 	C: MiningBlockChainClient,
-	M: MinerService {
+	M: MinerService
-
+{
 	client: Weak<C>,
 	miner: Weak<M>,
-	net: Weak<NetworkService<SyncMessage>>,
+	net: Weak<ManageNetwork>,
 }
 
 impl<C, M> EthcoreSetClient<C, M> where
 	C: MiningBlockChainClient,
 	M: MinerService {
 	/// Creates new `EthcoreSetClient`.
-	pub fn new(client: &Arc<C>, miner: &Arc<M>, net: &Arc<NetworkService<SyncMessage>>) -> Self {
+	pub fn new(client: &Arc<C>, miner: &Arc<M>, net: &Arc<ManageNetwork>) -> Self {
 		EthcoreSetClient {
 			client: Arc::downgrade(client),
 			miner: Arc::downgrade(miner),
@@ -144,4 +144,14 @@ impl<C, M> EthcoreSet for EthcoreSetClient<C, M> where
 		take_weak!(self.net).set_non_reserved_mode(NonReservedPeerMode::Accept);
 		to_value(&true)
 	}
+
+	fn start_network(&self, _: Params) -> Result<Value, Error> {
+		take_weak!(self.net).start_network();
+		Ok(Value::Bool(true))
+	}
+
+	fn stop_network(&self, _: Params) -> Result<Value, Error> {
+		take_weak!(self.net).stop_network();
+		Ok(Value::Bool(true))
+	}
 }

rpc/src/v1/impls/net.rs

@@ -48,13 +48,4 @@ impl<S> Net for NetClient<S> where S: SyncProvider + 'static {
 		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

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

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

@@ -19,12 +19,12 @@ use std::str::FromStr;
 use jsonrpc_core::IoHandler;
 use v1::{EthcoreSet, EthcoreSetClient};
 use ethcore::miner::MinerService;
-use ethcore::service::SyncMessage;
 use ethcore::client::TestBlockChainClient;
 use v1::tests::helpers::TestMinerService;
 use util::numbers::*;
-use util::network::{NetworkConfiguration, NetworkService};
 use rustc_serialize::hex::FromHex;
+use super::manage_network::TestManageNetwork;
+use ethsync::ManageNetwork;
 
 fn miner_service() -> Arc<TestMinerService> {
 	Arc::new(TestMinerService::default())
@@ -34,12 +34,12 @@ fn client_service() -> Arc<TestBlockChainClient> {
 	Arc::new(TestBlockChainClient::default())
 }
 
-fn network_service() -> Arc<NetworkService<SyncMessage>> {
+fn network_service() -> Arc<TestManageNetwork> {
-	Arc::new(NetworkService::new(NetworkConfiguration::new()).unwrap())
+	Arc::new(TestManageNetwork)
 }
 
-fn ethcore_set_client(client: &Arc<TestBlockChainClient>, miner: &Arc<TestMinerService>, net: &Arc<NetworkService<SyncMessage>>) -> EthcoreSetClient<TestBlockChainClient, TestMinerService> {
+fn ethcore_set_client(client: &Arc<TestBlockChainClient>, miner: &Arc<TestMinerService>, net: &Arc<TestManageNetwork>) -> EthcoreSetClient<TestBlockChainClient, TestMinerService> {
-	EthcoreSetClient::new(client, miner, net)
+	EthcoreSetClient::new(client, miner, &(net.clone() as Arc<ManageNetwork>))
 }
 
 #[test]

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

@@ -0,0 +1,30 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity 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 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.  If not, see <http://www.gnu.org/licenses/>.
+
+use ethsync::ManageNetwork;
+use util::network::NetworkConfiguration;
+
+pub struct TestManageNetwork;
+
+// TODO: rob, gavin (originally introduced this functions) - proper tests and test state
+impl ManageNetwork for TestManageNetwork {
+	fn set_non_reserved_mode(&self, _mode: ::util::network::NonReservedPeerMode) {}
+	fn remove_reserved_peer(&self, _peer: &str) -> Result<(), String> { Ok(()) }
+	fn add_reserved_peer(&self, _peer: &str) -> Result<(), String> { Ok(()) }
+	fn start_network(&self) {}
+	fn stop_network(&self) {}
+	fn network_config(&self) -> NetworkConfiguration { NetworkConfiguration::new_local() }
+}

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

@@ -26,3 +26,4 @@ mod personal_signer;
 mod ethcore;
 mod ethcore_set;
 mod rpc;
+mod manage_network;

rpc/src/v1/traits/ethcore_set.rs

@@ -55,6 +55,12 @@ pub trait EthcoreSet: Sized + Send + Sync + 'static {
 	/// Accept non-reserved peers (default behavior)
 	fn accept_non_reserved_peers(&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/traits/net.rs

@@ -30,12 +30,6 @@ 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));

sync/src/io.rs

@@ -16,7 +16,6 @@
 
 use util::{NetworkContext, PeerId, PacketId,};
 use util::error::UtilError;
-use ethcore::service::SyncMessage;
 use ethcore::client::BlockChainClient;
 
 /// IO interface for the syning handler.
@@ -47,13 +46,13 @@ pub trait SyncIo {
 
 /// Wraps `NetworkContext` and the blockchain client
 pub struct NetSyncIo<'s, 'h> where 'h: 's {
-	network: &'s NetworkContext<'h, SyncMessage>,
+	network: &'s NetworkContext<'h>,
 	chain: &'s BlockChainClient
 }
 
 impl<'s, 'h> NetSyncIo<'s, 'h> {
 	/// Creates a new instance from the `NetworkContext` and the blockchain client reference.
-	pub fn new(network: &'s NetworkContext<'h, SyncMessage>, chain: &'s BlockChainClient) -> NetSyncIo<'s, 'h> {
+	pub fn new(network: &'s NetworkContext<'h>, chain: &'s BlockChainClient) -> NetSyncIo<'s, 'h> {
 		NetSyncIo {
 			network: network,
 			chain: chain,

sync/src/lib.rs

@@ -34,15 +34,14 @@
 //! extern crate ethsync;
 //! use std::env;
 //! use std::sync::Arc;
-//! use util::network::{NetworkService, NetworkConfiguration};
+//! use util::network::{NetworkConfiguration};
+//! use util::io::IoChannel;
 //! use ethcore::client::{Client, ClientConfig};
-//! use ethsync::{EthSync, SyncConfig};
+//! use ethsync::{EthSync, SyncConfig, ManageNetwork};
 //! use ethcore::ethereum;
 //! use ethcore::miner::{GasPricer, Miner};
 //!
 //! fn main() {
-//! 	let mut service = NetworkService::new(NetworkConfiguration::new()).unwrap();
-//! 	service.start().unwrap();
 //! 	let dir = env::temp_dir();
 //! 	let miner = Miner::new(
 //! 		Default::default(),
@@ -55,10 +54,10 @@
 //!			ethereum::new_frontier(),
 //!			&dir,
 //!			miner,
-//!			service.io().channel()
+//!			IoChannel::disconnected()
 //!		).unwrap();
-//! 	let sync = EthSync::new(SyncConfig::default(), client);
+//! 	let sync = EthSync::new(SyncConfig::default(), client, NetworkConfiguration::new()).unwrap();
-//! 	EthSync::register(&mut service, sync);
+//! 	sync.start_network();
 //! }
 //! ```
 
@@ -75,13 +74,10 @@ extern crate heapsize;
 
 use std::ops::*;
 use std::sync::*;
-use util::network::{NetworkProtocolHandler, NetworkService, NetworkContext, PeerId};
+use util::network::{NetworkProtocolHandler, NetworkService, NetworkContext, PeerId, NetworkConfiguration};
-use util::{TimerToken, U256, RwLockable};
+use util::{TimerToken, U256, H256, RwLockable, UtilError};
-use ethcore::client::Client;
+use ethcore::client::{Client, ChainNotify};
-use ethcore::service::{SyncMessage, NetSyncMessage};
 use io::NetSyncIo;
-use util::io::IoChannel;
-use util::{NetworkIoMessage, NetworkError};
 use chain::ChainSync;
 
 mod chain;
@@ -91,6 +87,9 @@ mod io;
 #[cfg(test)]
 mod tests;
 
+/// Ethereum sync protocol
+pub const ETH_PROTOCOL: &'static str = "eth";
+
 /// Sync configuration
 pub struct SyncConfig {
 	/// Max blocks to download ahead
@@ -112,99 +111,142 @@ 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
 pub struct EthSync {
-	/// Shared blockchain client. TODO: this should evetually become an IPC endpoint
+	/// Network service
-	chain: Arc<Client>,
+	network: NetworkService,
-	/// Sync strategy
+	/// Protocol handler
-	sync: RwLock<ChainSync>,
+	handler: Arc<SyncProtocolHandler>,
-	/// 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 new(config: SyncConfig, chain: Arc<Client>) -> Arc<EthSync> {
+	pub fn new(config: SyncConfig, chain: Arc<Client>, network_config: NetworkConfiguration) -> Result<Arc<EthSync>, UtilError> {
-		let sync = ChainSync::new(config, chain.deref());
+		let chain_sync = ChainSync::new(config, chain.deref());
-		Arc::new(EthSync {
+		let service = try!(NetworkService::new(network_config));
-			chain: chain,
+		let sync = Arc::new(EthSync{
-			sync: RwLock::new(sync),
+			network: service,
-			io_channel: RwLock::new(IoChannel::disconnected()),
+			handler: Arc::new(SyncProtocolHandler { sync: RwLock::new(chain_sync), chain: chain }),
-		})
+		});
-	}
 
-	/// Register protocol with the network service
+		Ok(sync)
-	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.unwrapped_write().abort(&mut NetSyncIo::new(io, self.chain.deref()));
-	}
-
-	/// Restart sync
-	pub fn restart(&mut self, io: &mut NetworkContext<SyncMessage>) {
-		self.sync.unwrapped_write().restart(&mut NetSyncIo::new(io, self.chain.deref()));
 	}
 }
 
 impl SyncProvider for EthSync {
 	/// Get sync status
 	fn status(&self) -> SyncStatus {
-		self.sync.unwrapped_read().status()
+		self.handler.sync.unwrapped_read().status()
-	}
-
-	fn start_network(&self) {
-		self.io_channel.unwrapped_read().send(NetworkIoMessage::User(SyncMessage::StartNetwork))
-			.unwrap_or_else(|e| warn!("Error sending IO notification: {:?}", e));
-	}
-
-	fn stop_network(&self) {
-		self.io_channel.unwrapped_read().send(NetworkIoMessage::User(SyncMessage::StopNetwork))
-			.unwrap_or_else(|e| warn!("Error sending IO notification: {:?}", e));
 	}
 }
 
-impl NetworkProtocolHandler<SyncMessage> for EthSync {
+struct SyncProtocolHandler {
-	fn initialize(&self, io: &NetworkContext<SyncMessage>) {
+	/// Shared blockchain client. TODO: this should evetually become an IPC endpoint
+	chain: Arc<Client>,
+	/// Sync strategy
+	sync: RwLock<ChainSync>,
+}
+
+impl NetworkProtocolHandler for SyncProtocolHandler {
+	fn initialize(&self, io: &NetworkContext) {
 		io.register_timer(0, 1000).expect("Error registering sync timer");
-		*self.io_channel.unwrapped_write() = io.io_channel();
 	}
 
-	fn read(&self, io: &NetworkContext<SyncMessage>, peer: &PeerId, packet_id: u8, data: &[u8]) {
+	fn read(&self, io: &NetworkContext, peer: &PeerId, packet_id: u8, data: &[u8]) {
 		ChainSync::dispatch_packet(&self.sync, &mut NetSyncIo::new(io, self.chain.deref()), *peer, packet_id, data);
 	}
 
-	fn connected(&self, io: &NetworkContext<SyncMessage>, peer: &PeerId) {
+	fn connected(&self, io: &NetworkContext, peer: &PeerId) {
 		self.sync.unwrapped_write().on_peer_connected(&mut NetSyncIo::new(io, self.chain.deref()), *peer);
 	}
 
-	fn disconnected(&self, io: &NetworkContext<SyncMessage>, peer: &PeerId) {
+	fn disconnected(&self, io: &NetworkContext, peer: &PeerId) {
 		self.sync.unwrapped_write().on_peer_aborting(&mut NetSyncIo::new(io, self.chain.deref()), *peer);
 	}
 
-	fn timeout(&self, io: &NetworkContext<SyncMessage>, _timer: TimerToken) {
+	fn timeout(&self, io: &NetworkContext, _timer: TimerToken) {
 		self.sync.unwrapped_write().maintain_peers(&mut NetSyncIo::new(io, self.chain.deref()));
 		self.sync.unwrapped_write().maintain_sync(&mut NetSyncIo::new(io, self.chain.deref()));
 	}
+}
 
-	#[cfg_attr(feature="dev", allow(single_match))]
+impl ChainNotify for EthSync {
-	fn message(&self, io: &NetworkContext<SyncMessage>, message: &SyncMessage) {
+	fn new_blocks(&self,
-		match *message {
+		imported: Vec<H256>,
-			SyncMessage::NewChainBlocks { ref imported, ref invalid, ref enacted, ref retracted, ref sealed } => {
+		invalid: Vec<H256>,
-				let mut sync_io = NetSyncIo::new(io, self.chain.deref());
+		enacted: Vec<H256>,
-				self.sync.unwrapped_write().chain_new_blocks(&mut sync_io, imported, invalid, enacted, retracted, sealed);
+		retracted: Vec<H256>,
-			},
+		sealed: Vec<H256>)
-			_ => {/* Ignore other messages */},
+	{
+		self.network.with_context(ETH_PROTOCOL, |context| {
+			let mut sync_io = NetSyncIo::new(context, self.handler.chain.deref());
+			self.handler.sync.unwrapped_write().chain_new_blocks(
+				&mut sync_io,
+				&imported,
+				&invalid,
+				&enacted,
+				&retracted,
+				&sealed);
+		});
+	}
+
+	fn start(&self) {
+		self.network.start().unwrap_or_else(|e| warn!("Error starting network: {:?}", e));
+		self.network.register_protocol(self.handler.clone(), ETH_PROTOCOL, &[62u8, 63u8])
+			.unwrap_or_else(|e| warn!("Error registering ethereum protocol: {:?}", e));
+	}
+
+	fn stop(&self) {
+		self.network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
 	}
 }
+
+/// Trait for managing network
+pub trait ManageNetwork : Send + Sync {
+	/// Set mode for reserved peers (allow/deny peers that are unreserved)
+	fn set_non_reserved_mode(&self, mode: ::util::network::NonReservedPeerMode);
+	/// Remove reservation for the peer
+	fn remove_reserved_peer(&self, peer: &str) -> Result<(), String>;
+	/// Add reserved peer
+	fn add_reserved_peer(&self, peer: &str) -> Result<(), String>;
+	/// Start network
+	fn start_network(&self);
+	/// Stop network
+	fn stop_network(&self);
+	/// Query the current configuration of the network
+	fn network_config(&self) -> NetworkConfiguration;
+}
+
+impl ManageNetwork for EthSync {
+	fn set_non_reserved_mode(&self, mode: ::util::network::NonReservedPeerMode) {
+		self.network.set_non_reserved_mode(mode);
+	}
+
+	fn remove_reserved_peer(&self, peer: &str) -> Result<(), String> {
+		self.network.remove_reserved_peer(peer).map_err(|e| format!("{:?}", e))
+	}
+
+	fn add_reserved_peer(&self, peer: &str) -> Result<(), String> {
+		self.network.add_reserved_peer(peer).map_err(|e| format!("{:?}", e))
+	}
+
+	fn start_network(&self) {
+		self.start();
+	}
+
+	fn stop_network(&self) {
+		self.network.with_context(ETH_PROTOCOL, |context| {
+			let mut sync_io = NetSyncIo::new(context, self.handler.chain.deref());
+			self.handler.sync.unwrapped_write().abort(&mut sync_io);
+		});
+		self.stop();
+	}
+
+	fn network_config(&self) -> NetworkConfiguration {
+		self.network.config().clone()
+	}
 }

util/src/network/host.rs

@@ -136,11 +136,11 @@ pub type ProtocolId = &'static str;
 
 /// Messages used to communitate with the event loop from other threads.
 #[derive(Clone)]
-pub enum NetworkIoMessage<Message> where Message: Send + Sync + Clone {
+pub enum NetworkIoMessage {
 	/// Register a new protocol handler.
 	AddHandler {
 		/// Handler shared instance.
-		handler: Arc<NetworkProtocolHandler<Message> + Sync>,
+		handler: Arc<NetworkProtocolHandler + Sync>,
 		/// Protocol Id.
 		protocol: ProtocolId,
 		/// Supported protocol versions.
@@ -163,8 +163,6 @@ pub enum NetworkIoMessage<Message> where Message: Send + Sync + Clone {
 	DisablePeer(PeerId),
 	/// Network has been started with the host as the given enode.
 	NetworkStarted(String),
-	/// User message
-	User(Message),
 }
 
 /// Local (temporary) peer session ID.
@@ -188,8 +186,8 @@ impl Encodable for CapabilityInfo {
 }
 
 /// IO access point. This is passed to all IO handlers and provides an interface to the IO subsystem.
-pub struct NetworkContext<'s, Message> where Message: Send + Sync + Clone + 'static, 's {
+pub struct NetworkContext<'s> {
-	io: &'s IoContext<NetworkIoMessage<Message>>,
+	io: &'s IoContext<NetworkIoMessage>,
 	protocol: ProtocolId,
 	sessions: Arc<RwLock<Slab<SharedSession>>>,
 	session: Option<SharedSession>,
@@ -197,12 +195,12 @@ pub struct NetworkContext<'s, Message> where Message: Send + Sync + Clone + 'sta
 	_reserved_peers: &'s HashSet<NodeId>,
 }
 
-impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone + 'static, {
+impl<'s> NetworkContext<'s> {
 	/// Create a new network IO access point. Takes references to all the data that can be updated within the IO handler.
-	fn new(io: &'s IoContext<NetworkIoMessage<Message>>,
+	fn new(io: &'s IoContext<NetworkIoMessage>,
 		protocol: ProtocolId,
 		session: Option<SharedSession>, sessions: Arc<RwLock<Slab<SharedSession>>>,
-		reserved_peers: &'s HashSet<NodeId>) -> NetworkContext<'s, Message> {
+		reserved_peers: &'s HashSet<NodeId>) -> NetworkContext<'s> {
 		let id = session.as_ref().map(|s| s.locked().token());
 		NetworkContext {
 			io: io,
@@ -238,13 +236,8 @@ impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone
 		self.send(self.session_id.unwrap(), packet_id, data)
 	}
 
-	/// Send an IO message
-	pub fn message(&self, msg: Message) -> Result<(), UtilError> {
-		self.io.message(NetworkIoMessage::User(msg))
-	}
-
 	/// Get an IoChannel.
-	pub fn io_channel(&self) -> IoChannel<NetworkIoMessage<Message>> {
+	pub fn io_channel(&self) -> IoChannel<NetworkIoMessage> {
 		self.io.channel()
 	}
 
@@ -333,13 +326,13 @@ struct ProtocolTimer {
 }
 
 /// Root IO handler. Manages protocol handlers, IO timers and network connections.
-pub struct Host<Message> where Message: Send + Sync + Clone {
+pub struct Host {
 	pub info: RwLock<HostInfo>,
 	tcp_listener: Mutex<TcpListener>,
 	sessions: Arc<RwLock<Slab<SharedSession>>>,
 	discovery: Mutex<Option<Discovery>>,
 	nodes: RwLock<NodeTable>,
-	handlers: RwLock<HashMap<ProtocolId, Arc<NetworkProtocolHandler<Message>>>>,
+	handlers: RwLock<HashMap<ProtocolId, Arc<NetworkProtocolHandler>>>,
 	timers: RwLock<HashMap<TimerToken, ProtocolTimer>>,
 	timer_counter: RwLock<usize>,
 	stats: Arc<NetworkStats>,
@@ -348,9 +341,9 @@ pub struct Host<Message> where Message: Send + Sync + Clone {
 	stopping: AtomicBool,
 }
 
-impl<Message> Host<Message> where Message: Send + Sync + Clone {
+impl Host {
 	/// Create a new instance
-	pub fn new(config: NetworkConfiguration, stats: Arc<NetworkStats>) -> Result<Host<Message>, UtilError> {
+	pub fn new(config: NetworkConfiguration, stats: Arc<NetworkStats>) -> Result<Host, UtilError> {
 		trace!(target: "host", "Creating new Host object");
 
 		let mut listen_address = match config.listen_address {
@@ -381,7 +374,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		let boot_nodes = config.boot_nodes.clone();
 		let reserved_nodes = config.reserved_nodes.clone();
 
-		let mut host = Host::<Message> {
+		let mut host = Host {
 			info: RwLock::new(HostInfo {
 				keys: keys,
 				config: config,
@@ -444,7 +437,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		Ok(())
 	}
 
-	pub fn set_non_reserved_mode(&self, mode: NonReservedPeerMode, io: &IoContext<NetworkIoMessage<Message>>) {
+	pub fn set_non_reserved_mode(&self, mode: NonReservedPeerMode, io: &IoContext<NetworkIoMessage>) {
 		let mut info = self.info.unwrapped_write();
 
 		if info.config.non_reserved_mode != mode {
@@ -495,7 +488,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		r
 	}
 
-	pub fn stop(&self, io: &IoContext<NetworkIoMessage<Message>>) -> Result<(), UtilError> {
+	pub fn stop(&self, io: &IoContext<NetworkIoMessage>) -> Result<(), UtilError> {
 		self.stopping.store(true, AtomicOrdering::Release);
 		let mut to_kill = Vec::new();
 		for e in self.sessions.unwrapped_write().iter_mut() {
@@ -511,7 +504,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		Ok(())
 	}
 
-	fn init_public_interface(&self, io: &IoContext<NetworkIoMessage<Message>>) -> Result<(), UtilError> {
+	fn init_public_interface(&self, io: &IoContext<NetworkIoMessage>) -> Result<(), UtilError> {
 		if self.info.unwrapped_read().public_endpoint.is_some() {
 			return Ok(());
 		}
@@ -567,7 +560,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		Ok(())
 	}
 
-	fn maintain_network(&self, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn maintain_network(&self, io: &IoContext<NetworkIoMessage>) {
 		self.keep_alive(io);
 		self.connect_peers(io);
 	}
@@ -588,7 +581,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		self.sessions.unwrapped_read().count() - self.session_count()
 	}
 
-	fn keep_alive(&self, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn keep_alive(&self, io: &IoContext<NetworkIoMessage>) {
 		let mut to_kill = Vec::new();
 		for e in self.sessions.unwrapped_write().iter_mut() {
 			let mut s = e.locked();
@@ -603,7 +596,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn connect_peers(&self, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn connect_peers(&self, io: &IoContext<NetworkIoMessage>) {
 		let (ideal_peers, mut pin) = {
 			let info = self.info.unwrapped_read();
 			if info.capabilities.is_empty() {
@@ -651,7 +644,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 	}
 
 	#[cfg_attr(feature="dev", allow(single_match))]
-	fn connect_peer(&self, id: &NodeId, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn connect_peer(&self, id: &NodeId, io: &IoContext<NetworkIoMessage>) {
 		if self.have_session(id)
 		{
 			trace!(target: "network", "Aborted connect. Node already connected.");
@@ -688,9 +681,10 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 	}
 
 	#[cfg_attr(feature="dev", allow(block_in_if_condition_stmt))]
-	fn create_connection(&self, socket: TcpStream, id: Option<&NodeId>, io: &IoContext<NetworkIoMessage<Message>>) -> Result<(), UtilError> {
+	fn create_connection(&self, socket: TcpStream, id: Option<&NodeId>, io: &IoContext<NetworkIoMessage>) -> Result<(), UtilError> {
 		let nonce = self.info.unwrapped_write().next_nonce();
 		let mut sessions = self.sessions.unwrapped_write();
+
 		let token = sessions.insert_with_opt(|token| {
 			match Session::new(io, socket, token, id, &nonce, self.stats.clone(), &self.info.unwrapped_read()) {
 				Ok(s) => Some(Arc::new(Mutex::new(s))),
@@ -710,7 +704,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn accept(&self, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn accept(&self, io: &IoContext<NetworkIoMessage>) {
 		trace!(target: "network", "Accepting incoming connection");
 		loop {
 			let socket = match self.tcp_listener.locked().accept() {
@@ -727,8 +721,9 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn session_writable(&self, token: StreamToken, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn session_writable(&self, token: StreamToken, io: &IoContext<NetworkIoMessage>) {
 		let session = { self.sessions.unwrapped_read().get(token).cloned() };
+
 		if let Some(session) = session {
 			let mut s = session.locked();
 			if let Err(e) = s.writable(io, &self.info.unwrapped_read()) {
@@ -740,13 +735,13 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn connection_closed(&self, token: TimerToken, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn connection_closed(&self, token: TimerToken, io: &IoContext<NetworkIoMessage>) {
 		trace!(target: "network", "Connection closed: {}", token);
 		self.kill_connection(token, io, true);
 	}
 
 	#[cfg_attr(feature="dev", allow(collapsible_if))]
-	fn session_readable(&self, token: StreamToken, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn session_readable(&self, token: StreamToken, io: &IoContext<NetworkIoMessage>) {
 		let mut ready_data: Vec<ProtocolId> = Vec::new();
 		let mut packet_data: Vec<(ProtocolId, PacketId, Vec<u8>)> = Vec::new();
 		let mut kill = false;
@@ -831,12 +826,12 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn connection_timeout(&self, token: StreamToken, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn connection_timeout(&self, token: StreamToken, io: &IoContext<NetworkIoMessage>) {
 		trace!(target: "network", "Connection timeout: {}", token);
 		self.kill_connection(token, io, true)
 	}
 
-	fn kill_connection(&self, token: StreamToken, io: &IoContext<NetworkIoMessage<Message>>, remote: bool) {
+	fn kill_connection(&self, token: StreamToken, io: &IoContext<NetworkIoMessage>, remote: bool) {
 		let mut to_disconnect: Vec<ProtocolId> = Vec::new();
 		let mut failure_id = None;
 		let mut deregister = false;
@@ -876,7 +871,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 	}
 
-	fn update_nodes(&self, io: &IoContext<NetworkIoMessage<Message>>, node_changes: TableUpdates) {
+	fn update_nodes(&self, io: &IoContext<NetworkIoMessage>, node_changes: TableUpdates) {
 		let mut to_remove: Vec<PeerId> = Vec::new();
 		{
 			let sessions = self.sessions.unwrapped_write();
@@ -895,17 +890,24 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		}
 		self.nodes.unwrapped_write().update(node_changes);
 	}
+
+	pub fn with_context<F>(&self, protocol: ProtocolId, io: &IoContext<NetworkIoMessage>, action: F) where F: Fn(&NetworkContext) {
+		let reserved = { self.reserved_nodes.unwrapped_read() };
+
+		let context = NetworkContext::new(io, protocol, None, self.sessions.clone(), &reserved);
+		action(&context);
+	}
 }
 
-impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Message: Send + Sync + Clone + 'static {
+impl IoHandler<NetworkIoMessage> for Host {
 	/// Initialize networking
-	fn initialize(&self, io: &IoContext<NetworkIoMessage<Message>>) {
+	fn initialize(&self, io: &IoContext<NetworkIoMessage>) {
 		io.register_timer(IDLE, MAINTENANCE_TIMEOUT).expect("Error registering Network idle timer");
 		io.message(NetworkIoMessage::InitPublicInterface).unwrap_or_else(|e| warn!("Error sending IO notification: {:?}", e));
 		self.maintain_network(io)
 	}
 
-	fn stream_hup(&self, io: &IoContext<NetworkIoMessage<Message>>, stream: StreamToken) {
+	fn stream_hup(&self, io: &IoContext<NetworkIoMessage>, stream: StreamToken) {
 		trace!(target: "network", "Hup: {}", stream);
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => self.connection_closed(stream, io),
@@ -913,7 +915,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		};
 	}
 
-	fn stream_readable(&self, io: &IoContext<NetworkIoMessage<Message>>, stream: StreamToken) {
+	fn stream_readable(&self, io: &IoContext<NetworkIoMessage>, stream: StreamToken) {
 		if self.stopping.load(AtomicOrdering::Acquire) {
 			return;
 		}
@@ -930,7 +932,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		}
 	}
 
-	fn stream_writable(&self, io: &IoContext<NetworkIoMessage<Message>>, stream: StreamToken) {
+	fn stream_writable(&self, io: &IoContext<NetworkIoMessage>, stream: StreamToken) {
 		if self.stopping.load(AtomicOrdering::Acquire) {
 			return;
 		}
@@ -943,7 +945,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		}
 	}
 
-	fn timeout(&self, io: &IoContext<NetworkIoMessage<Message>>, token: TimerToken) {
+	fn timeout(&self, io: &IoContext<NetworkIoMessage>, token: TimerToken) {
 		if self.stopping.load(AtomicOrdering::Acquire) {
 			return;
 		}
@@ -978,7 +980,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		}
 	}
 
-	fn message(&self, io: &IoContext<NetworkIoMessage<Message>>, message: &NetworkIoMessage<Message>) {
+	fn message(&self, io: &IoContext<NetworkIoMessage>, message: &NetworkIoMessage) {
 		if self.stopping.load(AtomicOrdering::Acquire) {
 			return;
 		}
@@ -1031,19 +1033,13 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 				trace!(target: "network", "Disabling peer {}", peer);
 				self.kill_connection(*peer, io, false);
 			},
-			NetworkIoMessage::User(ref message) => {
-				let reserved = self.reserved_nodes.unwrapped_read();
-				for (p, h) in self.handlers.unwrapped_read().iter() {
-					h.message(&NetworkContext::new(io, p, None, self.sessions.clone(), &reserved), &message);
-				}
-			},
 			NetworkIoMessage::InitPublicInterface =>
 				self.init_public_interface(io).unwrap_or_else(|e| warn!("Error initializing public interface: {:?}", e)),
 			_ => {}	// ignore others.
 		}
 	}
 
-	fn register_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop<IoManager<NetworkIoMessage<Message>>>) {
+	fn register_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop<IoManager<NetworkIoMessage>>) {
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => {
 				let session = { self.sessions.unwrapped_read().get(stream).cloned() };
@@ -1057,7 +1053,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		}
 	}
 
-	fn deregister_stream(&self, stream: StreamToken, event_loop: &mut EventLoop<IoManager<NetworkIoMessage<Message>>>) {
+	fn deregister_stream(&self, stream: StreamToken, event_loop: &mut EventLoop<IoManager<NetworkIoMessage>>) {
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => {
 				let mut connections = self.sessions.unwrapped_write();
@@ -1071,7 +1067,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 		}
 	}
 
-	fn update_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop<IoManager<NetworkIoMessage<Message>>>) {
+	fn update_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop<IoManager<NetworkIoMessage>>) {
 		match stream {
 			FIRST_SESSION ... LAST_SESSION => {
 				let connection = { self.sessions.unwrapped_read().get(stream).cloned() };
@@ -1152,6 +1148,6 @@ 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, Arc::new(NetworkStats::new())).unwrap();
+	let host: Host = Host::new(config, Arc::new(NetworkStats::new())).unwrap();
 	assert!(host.local_url().starts_with("enode://101b3ef5a4ea7a1c7928e24c4c75fd053c235d7b80c22ae5c03d145d0ac7396e2a4ffff9adee3133a7b05044a5cee08115fd65145e5165d646bde371010d803c@"));
 }

util/src/network/mod.rs

@@ -24,39 +24,30 @@
 //!
 //! struct MyHandler;
 //!
-//! #[derive(Clone)]
+//! impl NetworkProtocolHandler for MyHandler {
-//! struct MyMessage {
+//!		fn initialize(&self, io: &NetworkContext) {
-//! 	data: u32
-//! }
-//!
-//! impl NetworkProtocolHandler<MyMessage> for MyHandler {
-//!		fn initialize(&self, io: &NetworkContext<MyMessage>) {
 //!			io.register_timer(0, 1000);
 //!		}
 //!
-//!		fn read(&self, io: &NetworkContext<MyMessage>, peer: &PeerId, packet_id: u8, data: &[u8]) {
+//!		fn read(&self, io: &NetworkContext, peer: &PeerId, packet_id: u8, data: &[u8]) {
 //!			println!("Received {} ({} bytes) from {}", packet_id, data.len(), peer);
 //!		}
 //!
-//!		fn connected(&self, io: &NetworkContext<MyMessage>, peer: &PeerId) {
+//!		fn connected(&self, io: &NetworkContext, peer: &PeerId) {
 //!			println!("Connected {}", peer);
 //!		}
 //!
-//!		fn disconnected(&self, io: &NetworkContext<MyMessage>, peer: &PeerId) {
+//!		fn disconnected(&self, io: &NetworkContext, peer: &PeerId) {
 //!			println!("Disconnected {}", peer);
 //!		}
 //!
-//!		fn timeout(&self, io: &NetworkContext<MyMessage>, timer: TimerToken) {
+//!		fn timeout(&self, io: &NetworkContext, timer: TimerToken) {
 //!			println!("Timeout {}", timer);
 //!		}
-//!
-//!		fn message(&self, io: &NetworkContext<MyMessage>, message: &MyMessage) {
-//!			println!("Message {}", message.data);
-//!		}
 //! }
 //!
 //! fn main () {
-//! 	let mut service = NetworkService::<MyMessage>::new(NetworkConfiguration::new_local()).expect("Error creating network service");
+//! 	let mut service = NetworkService::new(NetworkConfiguration::new_local()).expect("Error creating network service");
 //! 	service.register_protocol(Arc::new(MyHandler), "myproto", &[1u8]);
 //! 	service.start().expect("Error starting service");
 //!
@@ -84,7 +75,6 @@ pub use network::host::PacketId;
 pub use network::host::NetworkContext;
 pub use network::service::NetworkService;
 pub use network::host::NetworkIoMessage;
-pub use network::host::NetworkIoMessage::User as UserMessage;
 pub use network::error::NetworkError;
 pub use network::host::NetworkConfiguration;
 pub use network::stats::NetworkStats;
@@ -97,19 +87,17 @@ const PROTOCOL_VERSION: u32 = 4;
 /// Network IO protocol handler. This needs to be implemented for each new subprotocol.
 /// All the handler function are called from within IO event loop.
 /// `Message` is the type for message data.
-pub trait NetworkProtocolHandler<Message>: Sync + Send where Message: Send + Sync + Clone {
+pub trait NetworkProtocolHandler: Sync + Send {
 	/// Initialize the handler
-	fn initialize(&self, _io: &NetworkContext<Message>) {}
+	fn initialize(&self, _io: &NetworkContext) {}
 	/// Called when new network packet received.
-	fn read(&self, io: &NetworkContext<Message>, peer: &PeerId, packet_id: u8, data: &[u8]);
+	fn read(&self, io: &NetworkContext, peer: &PeerId, packet_id: u8, data: &[u8]);
 	/// Called when new peer is connected. Only called when peer supports the same protocol.
-	fn connected(&self, io: &NetworkContext<Message>, peer: &PeerId);
+	fn connected(&self, io: &NetworkContext, peer: &PeerId);
 	/// Called when a previously connected peer disconnects.
-	fn disconnected(&self, io: &NetworkContext<Message>, peer: &PeerId);
+	fn disconnected(&self, io: &NetworkContext, peer: &PeerId);
 	/// Timer function called after a timeout created with `NetworkContext::timeout`.
-	fn timeout(&self, _io: &NetworkContext<Message>, _timer: TimerToken) {}
+	fn timeout(&self, _io: &NetworkContext, _timer: TimerToken) {}
-	/// Called when a broadcasted message is received. The message can only be sent from a different IO handler.
-	fn message(&self, _io: &NetworkContext<Message>, _message: &Message) {}
 }
 
 /// Non-reserved peer modes.

util/src/network/service.rs

@@ -20,30 +20,30 @@ use panics::*;
 use misc::RwLockable;
 use network::{NetworkProtocolHandler, NetworkConfiguration};
 use network::error::NetworkError;
-use network::host::{Host, NetworkIoMessage, ProtocolId};
+use network::host::{Host, NetworkContext, NetworkIoMessage, ProtocolId};
 use network::stats::NetworkStats;
 use io::*;
 
 /// IO Service with networking
 /// `Message` defines a notification data type.
-pub struct NetworkService<Message> where Message: Send + Sync + Clone + 'static {
+pub struct NetworkService {
-	io_service: IoService<NetworkIoMessage<Message>>,
+	io_service: IoService<NetworkIoMessage>,
 	host_info: String,
-	host: RwLock<Option<Arc<Host<Message>>>>,
+	host: RwLock<Option<Arc<Host>>>,
 	stats: Arc<NetworkStats>,
 	panic_handler: Arc<PanicHandler>,
 	config: NetworkConfiguration,
 }
 
-impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'static {
+impl NetworkService {
 	/// Starts IO event loop
-	pub fn new(config: NetworkConfiguration) -> Result<NetworkService<Message>, UtilError> {
+	pub fn new(config: NetworkConfiguration) -> Result<NetworkService, UtilError> {
 		let panic_handler = PanicHandler::new_in_arc();
-		let io_service = try!(IoService::<NetworkIoMessage<Message>>::start());
+		let io_service = try!(IoService::<NetworkIoMessage>::start());
 		panic_handler.forward_from(&io_service);
 
 		let stats = Arc::new(NetworkStats::new());
-		let host_info = Host::<Message>::client_version();
+		let host_info = Host::client_version();
 		Ok(NetworkService {
 			io_service: io_service,
 			host_info: host_info,
@@ -55,7 +55,7 @@ impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'stat
 	}
 
 	/// Regiter a new protocol handler with the event loop.
-	pub fn register_protocol(&self, handler: Arc<NetworkProtocolHandler<Message>+Send + Sync>, protocol: ProtocolId, versions: &[u8]) -> Result<(), NetworkError> {
+	pub fn register_protocol(&self, handler: Arc<NetworkProtocolHandler + Send + Sync>, protocol: ProtocolId, versions: &[u8]) -> Result<(), NetworkError> {
 		try!(self.io_service.send_message(NetworkIoMessage::AddHandler {
 			handler: handler,
 			protocol: protocol,
@@ -70,7 +70,7 @@ impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'stat
 	}
 
 	/// Returns underlying io service.
-	pub fn io(&self) -> &IoService<NetworkIoMessage<Message>> {
+	pub fn io(&self) -> &IoService<NetworkIoMessage> {
 		&self.io_service
 	}
 
@@ -146,9 +146,18 @@ impl<Message> NetworkService<Message> where Message: Send + Sync + Clone + 'stat
 			host.set_non_reserved_mode(mode, &io_ctxt);
 		}
 	}
+
+	/// Executes action in the network context
+	pub fn with_context<F>(&self, protocol: ProtocolId, action: F) where F: Fn(&NetworkContext) {
+		let io = IoContext::new(self.io_service.channel(), 0);
+		let host = self.host.unwrapped_read();
+		if let Some(ref host) = host.as_ref() {
+			host.with_context(protocol, &io, action);
+		};
+	}
 }
 
-impl<Message> MayPanic for NetworkService<Message> where Message: Send + Sync + Clone + 'static {
+impl MayPanic for NetworkService {
 	fn on_panic<F>(&self, closure: F) where F: OnPanicListener {
 		self.panic_handler.on_panic(closure);
 	}

util/src/network/tests.rs

@@ -30,11 +30,6 @@ pub struct TestProtocol {
 	pub got_disconnect: AtomicBool,
 }
 
-#[derive(Clone)]
-pub struct TestProtocolMessage {
-	payload: u32,
-}
-
 impl TestProtocol {
 	pub fn new(drop_session: bool) -> Self {
 		TestProtocol {
@@ -45,7 +40,7 @@ impl TestProtocol {
 		}
 	}
 	/// Creates and register protocol with the network service
-	pub fn register(service: &mut NetworkService<TestProtocolMessage>, drop_session: bool) -> Arc<TestProtocol> {
+	pub fn register(service: &mut NetworkService, drop_session: bool) -> Arc<TestProtocol> {
 		let handler = Arc::new(TestProtocol::new(drop_session));
 		service.register_protocol(handler.clone(), "test", &[42u8, 43u8]).expect("Error registering test protocol handler");
 		handler
@@ -64,17 +59,17 @@ impl TestProtocol {
 	}
 }
 
-impl NetworkProtocolHandler<TestProtocolMessage> for TestProtocol {
+impl NetworkProtocolHandler for TestProtocol {
-	fn initialize(&self, io: &NetworkContext<TestProtocolMessage>) {
+	fn initialize(&self, io: &NetworkContext) {
 		io.register_timer(0, 10).unwrap();
 	}
 
-	fn read(&self, _io: &NetworkContext<TestProtocolMessage>, _peer: &PeerId, packet_id: u8, data: &[u8]) {
+	fn read(&self, _io: &NetworkContext, _peer: &PeerId, packet_id: u8, data: &[u8]) {
 		assert_eq!(packet_id, 33);
 		self.packet.locked().extend(data);
 	}
 
-	fn connected(&self, io: &NetworkContext<TestProtocolMessage>, peer: &PeerId) {
+	fn connected(&self, io: &NetworkContext, peer: &PeerId) {
 		assert!(io.peer_info(*peer).contains("Parity"));
 		if self.drop_session {
 			io.disconnect_peer(*peer)
@@ -83,13 +78,12 @@ impl NetworkProtocolHandler<TestProtocolMessage> for TestProtocol {
 		}
 	}
 
-	fn disconnected(&self, _io: &NetworkContext<TestProtocolMessage>, _peer: &PeerId) {
+	fn disconnected(&self, _io: &NetworkContext, _peer: &PeerId) {
 		self.got_disconnect.store(true, AtomicOrdering::Relaxed);
 	}
 
 	/// Timer function called after a timeout created with `NetworkContext::timeout`.
-	fn timeout(&self, io: &NetworkContext<TestProtocolMessage>, timer: TimerToken) {
+	fn timeout(&self, _io: &NetworkContext, timer: TimerToken) {
-		io.message(TestProtocolMessage { payload: 22 }).unwrap();
 		assert_eq!(timer, 0);
 		self.got_timeout.store(true, AtomicOrdering::Relaxed);
 	}
@@ -98,7 +92,7 @@ impl NetworkProtocolHandler<TestProtocolMessage> for TestProtocol {
 
 #[test]
 fn net_service() {
-	let service = NetworkService::<TestProtocolMessage>::new(NetworkConfiguration::new_local()).expect("Error creating network service");
+	let service = NetworkService::new(NetworkConfiguration::new_local()).expect("Error creating network service");
 	service.start().unwrap();
 	service.register_protocol(Arc::new(TestProtocol::new(false)), "myproto", &[1u8]).unwrap();
 }
@@ -110,13 +104,13 @@ 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>::new(config1).unwrap();
+	let mut service1 = NetworkService::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().unwrap());
 	config2.boot_nodes = vec![ service1.local_url().unwrap() ];
-	let mut service2 = NetworkService::<TestProtocolMessage>::new(config2).unwrap();
+	let mut service2 = NetworkService::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) {
@@ -129,7 +123,7 @@ fn net_connect() {
 #[test]
 fn net_start_stop() {
 	let config = NetworkConfiguration::new_local();
-	let service = NetworkService::<TestProtocolMessage>::new(config).unwrap();
+	let service = NetworkService::new(config).unwrap();
 	service.start().unwrap();
 	service.stop().unwrap();
 	service.start().unwrap();
@@ -141,12 +135,12 @@ fn net_disconnect() {
 	let mut config1 = NetworkConfiguration::new_local();
 	config1.use_secret = Some(key1.secret().clone());
 	config1.boot_nodes = vec![ ];
-	let mut service1 = NetworkService::<TestProtocolMessage>::new(config1).unwrap();
+	let mut service1 = NetworkService::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().unwrap() ];
-	let mut service2 = NetworkService::<TestProtocolMessage>::new(config2).unwrap();
+	let mut service2 = NetworkService::new(config2).unwrap();
 	service2.start().unwrap();
 	let handler2 = TestProtocol::register(&mut service2, true);
 	while !(handler1.got_disconnect() && handler2.got_disconnect()) {
@@ -159,7 +153,7 @@ fn net_disconnect() {
 #[test]
 fn net_timeout() {
 	let config = NetworkConfiguration::new_local();
-	let mut service = NetworkService::<TestProtocolMessage>::new(config).unwrap();
+	let mut service = NetworkService::new(config).unwrap();
 	service.start().unwrap();
 	let handler = TestProtocol::register(&mut service, false);
 	while !handler.got_timeout() {