Merge `Notifier` and `TransactionsPoolNotifier` (#10591)

* Merge `Notifier` and `TransactionsPoolNotifier`

* fix tests

ethcore/light/src/transaction_queue.rs

@@ -129,15 +129,13 @@ pub enum ImportDestination {
 	Future,
 }
 
-type Listener = Box<Fn(&[H256]) + Send + Sync>;
-
 /// Light transaction queue. See module docs for more details.
 #[derive(Default)]
 pub struct TransactionQueue {
 	by_account: HashMap<Address, AccountTransactions>,
 	by_hash: H256FastMap<PendingTransaction>,
-	listeners: Vec<Listener>,
+	pending_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<H256>>>>,
-	tx_statuses_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>>,
+	full_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>>,
 }
 
 impl fmt::Debug for TransactionQueue {
@@ -145,7 +143,8 @@ impl fmt::Debug for TransactionQueue {
 		fmt.debug_struct("TransactionQueue")
 			.field("by_account", &self.by_account)
 			.field("by_hash", &self.by_hash)
-			.field("listeners", &self.listeners.len())
+			.field("pending_listeners", &self.pending_listeners.len())
+			.field("full_listeners", &self.pending_listeners.len())
 			.finish()
 	}
 }
@@ -360,30 +359,40 @@ impl TransactionQueue {
 	}
 
 	/// Add a transaction queue listener.
-	pub fn add_listener(&mut self, f: Listener) {
+	pub fn pending_transactions_receiver(&mut self) -> mpsc::UnboundedReceiver<Arc<Vec<H256>>> {
-		self.listeners.push(f);
+		let (sender, receiver) = mpsc::unbounded();
+		self.pending_listeners.push(sender);
+		receiver
 	}
 
 	/// Add a transaction queue listener.
-	pub fn tx_statuses_receiver(&mut self) -> mpsc::UnboundedReceiver<Arc<Vec<(H256, TxStatus)>>> {
+	pub fn full_transactions_receiver(&mut self) -> mpsc::UnboundedReceiver<Arc<Vec<(H256, TxStatus)>>> {
 		let (sender, receiver) = mpsc::unbounded();
-		self.tx_statuses_listeners.push(sender);
+		self.full_listeners.push(sender);
 		receiver
 	}
 
 	/// Notifies all listeners about new pending transaction.
 	fn notify(&mut self, hashes: &[H256], status: TxStatus) {
-		for listener in &self.listeners {
+		if status == TxStatus::Added {
-			listener(hashes)
+			let to_pending_send: Arc<Vec<H256>> = Arc::new(
+				hashes
+					.into_iter()
+					.map(|hash| hash.clone())
+					.collect()
+			);
+			self.pending_listeners.retain(|listener| listener.unbounded_send(to_pending_send.clone()).is_ok());
+
 		}
 
-		let to_send: Arc<Vec<(H256, TxStatus)>> = Arc::new(
+		let to_full_send: Arc<Vec<(H256, TxStatus)>> = Arc::new(
 			hashes
 				.into_iter()
-				.map(|hash| (hash.clone(), status)).collect()
+				.map(|hash| (hash.clone(), status))
+				.collect()
 		);
 
-		self.tx_statuses_listeners.retain(| listener| listener.unbounded_send(to_send.clone()).is_ok());
+		self.full_listeners.retain(|listener| listener.unbounded_send(to_full_send.clone()).is_ok());
 	}
 }
 

ethcore/src/miner/miner.rs

@@ -260,14 +260,16 @@ impl Miner {
 	}
 
 	/// Set a callback to be notified about imported transactions' hashes.
-	pub fn add_transactions_listener(&self, f: Box<Fn(&[H256]) + Send + Sync>) {
+	pub fn pending_transactions_receiver(&self) -> mpsc::UnboundedReceiver<Arc<Vec<H256>>> {
-		self.transaction_queue.add_listener(f);
+		let (sender, receiver) = mpsc::unbounded();
+		self.transaction_queue.add_pending_listener(sender);
+		receiver
 	}
 
-	/// Set a callback to be notified
+	/// Set a callback to be notified about imported transactions' hashes.
-	pub fn tx_pool_receiver(&self) -> mpsc::UnboundedReceiver<Arc<Vec<(H256, TxStatus)>>> {
+	pub fn full_transactions_receiver(&self) -> mpsc::UnboundedReceiver<Arc<Vec<(H256, TxStatus)>>> {
 		let (sender, receiver) = mpsc::unbounded();
-		self.transaction_queue.add_tx_pool_listener(sender);
+		self.transaction_queue.add_full_listener(sender);
 		receiver
 	}
 

miner/src/pool/listener.rs

@@ -26,50 +26,6 @@ use txpool::{self, VerifiedTransaction};
 use pool::VerifiedTransaction as Transaction;
 use pool::TxStatus;
 
-type Listener = Box<Fn(&[H256]) + Send + Sync>;
-
-/// Manages notifications to pending transaction listeners.
-#[derive(Default)]
-pub struct Notifier {
-	listeners: Vec<Listener>,
-	pending: Vec<H256>,
-}
-
-impl fmt::Debug for Notifier {
-	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-		fmt.debug_struct("Notifier")
-			.field("listeners", &self.listeners.len())
-			.field("pending", &self.pending)
-			.finish()
-	}
-}
-
-impl Notifier {
-	/// Add new listener to receive notifications.
-	pub fn add(&mut self, f: Listener) {
-		self.listeners.push(f)
-	}
-
-	/// Notify listeners about all currently pending transactions.
-	pub fn notify(&mut self) {
-		if self.pending.is_empty() {
-			return;
-		}
-
-		for l in &self.listeners {
-			(l)(&self.pending);
-		}
-
-		self.pending.clear();
-	}
-}
-
-impl txpool::Listener<Transaction> for Notifier {
-	fn added(&mut self, tx: &Arc<Transaction>, _old: Option<&Arc<Transaction>>) {
-		self.pending.push(*tx.hash());
-	}
-}
-
 /// Transaction pool logger.
 #[derive(Default, Debug)]
 pub struct Logger;
@@ -121,14 +77,20 @@ impl txpool::Listener<Transaction> for Logger {
 /// Transactions pool notifier
 #[derive(Default)]
 pub struct TransactionsPoolNotifier {
-	listeners: Vec<mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>>,
+	full_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>>,
+	pending_listeners: Vec<mpsc::UnboundedSender<Arc<Vec<H256>>>>,
 	tx_statuses: Vec<(H256, TxStatus)>,
 }
 
 impl TransactionsPoolNotifier {
-	/// Add new listener to receive notifications.
+	/// Add new full listener to receive notifications.
-	pub fn add(&mut self, f: mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>) {
+	pub fn add_full_listener(&mut self, f: mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>) {
-		self.listeners.push(f);
+		self.full_listeners.push(f);
+	}
+
+	/// Add new pending listener to receive notifications.
+	pub fn add_pending_listener(&mut self, f: mpsc::UnboundedSender<Arc<Vec<H256>>>) {
+		self.pending_listeners.push(f);
 	}
 
 	/// Notify listeners about all currently transactions.
@@ -137,16 +99,25 @@ impl TransactionsPoolNotifier {
 			return;
 		}
 
-		let to_send = Arc::new(std::mem::replace(&mut self.tx_statuses, Vec::new()));
+		let to_pending_send: Arc<Vec<H256>> = Arc::new(
-		self.listeners
+			self.tx_statuses.clone()
-			.retain(|listener| listener.unbounded_send(to_send.clone()).is_ok());
+				.into_iter()
+				.map(|(hash, _)| hash)
+				.collect()
+		);
+		self.pending_listeners.retain(|listener| listener.unbounded_send(to_pending_send.clone()).is_ok());
+
+		let to_full_send = Arc::new(std::mem::replace(&mut self.tx_statuses, Vec::new()));
+		self.full_listeners
+			.retain(|listener| listener.unbounded_send(to_full_send.clone()).is_ok());
 	}
 }
 
 impl fmt::Debug for TransactionsPoolNotifier {
 	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
 		fmt.debug_struct("TransactionsPoolNotifier")
-			.field("listeners", &self.listeners.len())
+			.field("full_listeners", &self.full_listeners.len())
+			.field("pending_listeners", &self.pending_listeners.len())
 			.finish()
 	}
 }
@@ -180,33 +151,36 @@ impl txpool::Listener<Transaction> for TransactionsPoolNotifier {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use parking_lot::Mutex;
 	use types::transaction;
 	use txpool::Listener;
+	use futures::{Stream, Future};
 	use ethereum_types::Address;
 
 	#[test]
 	fn should_notify_listeners() {
 		// given
-		let received = Arc::new(Mutex::new(vec![]));
+		let (full_sender, full_receiver) = mpsc::unbounded();
-		let r = received.clone();
+		let (pending_sender, pending_receiver) = mpsc::unbounded();
-		let listener = Box::new(move |hashes: &[H256]| {
-			*r.lock() = hashes.iter().map(|x| *x).collect();
-		});
 
-		let mut tx_listener = Notifier::default();
+		let mut tx_listener = TransactionsPoolNotifier::default();
-		tx_listener.add(listener);
+		tx_listener.add_full_listener(full_sender);
+		tx_listener.add_pending_listener(pending_sender);
 
 		// when
 		let tx = new_tx();
 		tx_listener.added(&tx, None);
-		assert_eq!(*received.lock(), vec![]);
 
 		// then
 		tx_listener.notify();
+		let (full_res , _full_receiver)= full_receiver.into_future().wait().unwrap();
+		let (pending_res , _pending_receiver)= pending_receiver.into_future().wait().unwrap();
 		assert_eq!(
-			*received.lock(),
+			full_res,
-			vec!["13aff4201ac1dc49daf6a7cf07b558ed956511acbaabf9502bdacc353953766d".parse().unwrap()]
+			Some(Arc::new(vec![(serde_json::from_str::<H256>("\"0x13aff4201ac1dc49daf6a7cf07b558ed956511acbaabf9502bdacc353953766d\"").unwrap(), TxStatus::Added)]))
+		);
+		assert_eq!(
+			pending_res,
+			Some(Arc::new(vec![serde_json::from_str::<H256>("\"0x13aff4201ac1dc49daf6a7cf07b558ed956511acbaabf9502bdacc353953766d\"").unwrap()]))
 		);
 	}
 

miner/src/pool/queue.rs

@@ -33,7 +33,7 @@ use pool::{
 };
 use pool::local_transactions::LocalTransactionsList;
 
-type Listener = (LocalTransactionsList, (listener::Notifier, (listener::Logger, listener::TransactionsPoolNotifier)));
+type Listener = (LocalTransactionsList, (listener::TransactionsPoolNotifier, listener::Logger));
 type Pool = txpool::Pool<pool::VerifiedTransaction, scoring::NonceAndGasPrice, Listener>;
 
 /// Max cache time in milliseconds for pending transactions.
@@ -305,8 +305,6 @@ impl TransactionQueue {
 		// Notify about imported transactions.
 		(self.pool.write().listener_mut().1).0.notify();
 
-		((self.pool.write().listener_mut().1).1).1.notify();
-
 		if results.iter().any(|r| r.is_ok()) {
 			self.cached_pending.write().clear();
 		}
@@ -499,7 +497,7 @@ impl TransactionQueue {
 	/// removes them from the pool.
 	/// That method should be used if invalid transactions are detected
 	/// or you want to cancel a transaction.
-	pub fn remove<'a, T: IntoIterator<Item = &'a H256>>(
+	pub fn remove<'a, T: IntoIterator<Item=&'a H256>>(
 		&self,
 		hashes: T,
 		is_invalid: bool,
@@ -571,16 +569,16 @@ impl TransactionQueue {
 		self.pool.read().listener().0.all_transactions().iter().map(|(a, b)| (*a, b.clone())).collect()
 	}
 
-	/// Add a callback to be notified about all transactions entering the pool.
+	/// Add a listener to be notified about all transactions the pool
-	pub fn add_listener(&self, f: Box<Fn(&[H256]) + Send + Sync>) {
+	pub fn add_pending_listener(&self, f: mpsc::UnboundedSender<Arc<Vec<H256>>>) {
 		let mut pool = self.pool.write();
-		(pool.listener_mut().1).0.add(f);
+		(pool.listener_mut().1).0.add_pending_listener(f);
 	}
 
 	/// Add a listener to be notified about all transactions the pool
-	pub fn add_tx_pool_listener(&self, f: mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>) {
+	pub fn add_full_listener(&self, f: mpsc::UnboundedSender<Arc<Vec<(H256, TxStatus)>>>) {
 		let mut pool = self.pool.write();
-		((pool.listener_mut().1).1).1.add(f);
+		(pool.listener_mut().1).0.add_full_listener(f);
 	}
 
 	/// Check if pending set is cached.

parity/rpc_apis.rs

@@ -329,8 +329,9 @@ impl FullDependencies {
 				}
 				Api::EthPubSub => {
 					if !for_generic_pubsub {
+						let pool_receiver = self.miner.pending_transactions_receiver();
 						let mut client =
-							EthPubSubClient::new(self.client.clone(), self.executor.clone());
+							EthPubSubClient::new(self.client.clone(), self.executor.clone(), pool_receiver);
 						let weak_client = Arc::downgrade(&self.client);
 
 						client.add_sync_notifier(self.sync.sync_notification(), move |state| {
@@ -345,14 +346,6 @@ impl FullDependencies {
 							})
 						});
 
-						let h = client.handler();
-						self.miner
-							.add_transactions_listener(Box::new(move |hashes| {
-								if let Some(h) = h.upgrade() {
-									h.notify_new_transactions(hashes);
-								}
-							}));
-
 						if let Some(h) = client.handler().upgrade() {
 							self.client.add_notify(h);
 						}
@@ -361,7 +354,7 @@ impl FullDependencies {
 				}
 				Api::ParityTransactionsPool => {
 					if !for_generic_pubsub {
-						let receiver = self.miner.tx_pool_receiver();
+						let receiver = self.miner.full_transactions_receiver();
 						let client = TransactionsPoolClient::new(self.executor.clone(), receiver);
 						handler.extend_with(TransactionsPoolClient::to_delegate(client));
 					}
@@ -583,6 +576,8 @@ impl<C: LightChainClient + 'static> LightDependencies<C> {
 					}
 				}
 				Api::EthPubSub => {
+					let receiver = self.transaction_queue.write().pending_transactions_receiver();
+
 					let mut client = EthPubSubClient::light(
 						self.client.clone(),
 						self.on_demand.clone(),
@@ -590,6 +585,7 @@ impl<C: LightChainClient + 'static> LightDependencies<C> {
 						self.cache.clone(),
 						self.executor.clone(),
 						self.gas_price_percentile,
+						receiver
 					);
 
 					let weak_client = Arc::downgrade(&self.client);
@@ -607,19 +603,11 @@ impl<C: LightChainClient + 'static> LightDependencies<C> {
 					});
 
 					self.client.add_listener(client.handler() as Weak<_>);
-					let h = client.handler();
-					self.transaction_queue
-						.write()
-						.add_listener(Box::new(move |transactions| {
-							if let Some(h) = h.upgrade() {
-								h.notify_new_transactions(transactions);
-							}
-						}));
 					handler.extend_with(EthPubSub::to_delegate(client));
 				}
 				Api::ParityTransactionsPool => {
 					if !for_generic_pubsub {
-						let receiver = self.transaction_queue.write().tx_statuses_receiver();
+						let receiver = self.transaction_queue.write().full_transactions_receiver();
 						let client = TransactionsPoolClient::new(self.executor.clone(), receiver);
 						handler.extend_with(TransactionsPoolClient::to_delegate(client));
 					}

parity/run.rs

@@ -30,7 +30,7 @@ use ethcore::verification::queue::VerifierSettings;
 use ethcore_logger::{Config as LogConfig, RotatingLogger};
 use ethcore_service::ClientService;
 use ethereum_types::Address;
-use futures::IntoFuture;
+use futures::{IntoFuture, Stream};
 use hash_fetch::{self, fetch};
 use informant::{Informant, LightNodeInformantData, FullNodeInformantData};
 use journaldb::Algorithm;
@@ -668,14 +668,19 @@ fn execute_impl<Cr, Rr>(cmd: RunCmd, logger: Arc<RotatingLogger>, on_client_rq:
 	// Propagate transactions as soon as they are imported.
 	let tx = ::parking_lot::Mutex::new(priority_tasks);
 	let is_ready = Arc::new(atomic::AtomicBool::new(true));
-	miner.add_transactions_listener(Box::new(move |_hashes| {
+	let executor = runtime.executor();
-		// we want to have only one PendingTransactions task in the queue.
+	let pool_receiver = miner.pending_transactions_receiver();
-		if is_ready.compare_and_swap(true, false, atomic::Ordering::SeqCst) {
+	executor.spawn(
-			let task = ::sync::PriorityTask::PropagateTransactions(Instant::now(), is_ready.clone());
+		pool_receiver.for_each(move |_hashes| {
-			// we ignore error cause it means that we are closing
+			// we want to have only one PendingTransactions task in the queue.
-			let _ = tx.lock().send(task);
+			if is_ready.compare_and_swap(true, false, atomic::Ordering::SeqCst) {
-		}
+				let task = ::sync::PriorityTask::PropagateTransactions(Instant::now(), is_ready.clone());
-	}));
+				// we ignore error cause it means that we are closing
+				let _ = tx.lock().send(task);
+			}
+			Ok(())
+		})
+	);
 
 	// provider not added to a notification center is effectively disabled
 	// TODO [debris] refactor it later on

rpc/src/v1/impls/eth_pubsub.rs

@@ -20,7 +20,7 @@ use std::sync::{Arc, Weak};
 use std::collections::BTreeMap;
 
 use jsonrpc_core::{BoxFuture, Result, Error};
-use jsonrpc_core::futures::{self, Future, IntoFuture, Stream};
+use jsonrpc_core::futures::{self, Future, IntoFuture, Stream, sync::mpsc};
 use jsonrpc_pubsub::typed::{Sink, Subscriber};
 use jsonrpc_pubsub::SubscriptionId;
 
@@ -80,23 +80,39 @@ impl<C> EthPubSubClient<C>
 	}
 }
 
-impl<C> EthPubSubClient<C> {
+impl<C> EthPubSubClient<C>
+	where
+		C: 'static + Send + Sync {
+
 	/// Creates new `EthPubSubClient`.
-	pub fn new(client: Arc<C>, executor: Executor) -> Self {
+	pub fn new(client: Arc<C>, executor: Executor, pool_receiver: mpsc::UnboundedReceiver<Arc<Vec<H256>>>) -> Self {
 		let heads_subscribers = Arc::new(RwLock::new(Subscribers::default()));
 		let logs_subscribers = Arc::new(RwLock::new(Subscribers::default()));
 		let transactions_subscribers = Arc::new(RwLock::new(Subscribers::default()));
 		let sync_subscribers = Arc::new(RwLock::new(Subscribers::default()));
 
+		let handler = Arc::new(ChainNotificationHandler {
+			client,
+			executor,
+			heads_subscribers: heads_subscribers.clone(),
+			logs_subscribers: logs_subscribers.clone(),
+			transactions_subscribers: transactions_subscribers.clone(),
+			sync_subscribers: sync_subscribers.clone(),
+		});
+		let handler2 = Arc::downgrade(&handler);
+
+		handler.executor.spawn(pool_receiver
+			.for_each(move |hashes| {
+				if let Some(handler2) = handler2.upgrade() {
+					handler2.notify_new_transactions(&hashes.to_vec());
+					return Ok(())
+				}
+				Err(())
+			})
+		);
+
 		EthPubSubClient {
-			handler: Arc::new(ChainNotificationHandler {
+			handler,
-				client,
-				executor,
-				heads_subscribers: heads_subscribers.clone(),
-				logs_subscribers: logs_subscribers.clone(),
-				transactions_subscribers: transactions_subscribers.clone(),
-				sync_subscribers: sync_subscribers.clone(),
-			}),
 			sync_subscribers,
 			heads_subscribers,
 			logs_subscribers,
@@ -123,6 +139,7 @@ where
 		cache: Arc<Mutex<Cache>>,
 		executor: Executor,
 		gas_price_percentile: usize,
+		pool_receiver: mpsc::UnboundedReceiver<Arc<Vec<H256>>>
 	) -> Self {
 		let fetch = LightFetch {
 			client,
@@ -131,7 +148,7 @@ where
 			cache,
 			gas_price_percentile,
 		};
-		EthPubSubClient::new(Arc::new(fetch), executor)
+		EthPubSubClient::new(Arc::new(fetch), executor, pool_receiver)
 	}
 }
 
@@ -205,7 +222,7 @@ impl<C> ChainNotificationHandler<C> {
 	}
 
 	/// Notify all subscribers about new transaction hashes.
-	pub fn notify_new_transactions(&self, hashes: &[H256]) {
+	fn notify_new_transactions(&self, hashes: &[H256]) {
 		for subscriber in self.transactions_subscribers.read().values() {
 			for hash in hashes {
 				Self::notify(&self.executor, subscriber, pubsub::Result::TransactionHash(*hash));

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

@@ -17,7 +17,7 @@
 use std::sync::Arc;
 
 use jsonrpc_core::MetaIoHandler;
-use jsonrpc_core::futures::{self, Stream, Future};
+use jsonrpc_core::futures::{self, Stream, Future, sync::mpsc};
 use jsonrpc_pubsub::Session;
 
 use std::time::Duration;
@@ -40,7 +40,9 @@ fn should_subscribe_to_new_heads() {
 	let h2 = client.block_hash_delta_minus(2);
 	let h1 = client.block_hash_delta_minus(3);
 
-	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor());
+	let (_, pool_receiver) = mpsc::unbounded();
+
+	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor(), pool_receiver);
 	let handler = pubsub.handler().upgrade().unwrap();
 	let pubsub = pubsub.to_delegate();
 
@@ -112,7 +114,9 @@ fn should_subscribe_to_logs() {
 		}
 	]);
 
-	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor());
+	let (_, pool_receiver) = mpsc::unbounded();
+
+	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor(), pool_receiver);
 	let handler = pubsub.handler().upgrade().unwrap();
 	let pubsub = pubsub.to_delegate();
 
@@ -159,8 +163,9 @@ fn should_subscribe_to_pending_transactions() {
 	let el = Runtime::with_thread_count(1);
 	let client = TestBlockChainClient::new();
 
-	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor());
+	let (pool_sender, pool_receiver) = mpsc::unbounded();
-	let handler = pubsub.handler().upgrade().unwrap();
+
+	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor(), pool_receiver);
 	let pubsub = pubsub.to_delegate();
 
 	let mut io = MetaIoHandler::default();
@@ -181,7 +186,7 @@ fn should_subscribe_to_pending_transactions() {
 	assert_eq!(io.handle_request_sync(request, metadata.clone()), Some(response.to_owned()));
 
 	// Send new transactions
-	handler.notify_new_transactions(&[H256::from_low_u64_be(5), H256::from_low_u64_be(7)]);
+	pool_sender.unbounded_send(Arc::new(vec![H256::from_low_u64_be(5), H256::from_low_u64_be(7)])).unwrap();
 
 	let (res, receiver) = receiver.into_future().wait().unwrap();
 	let response = r#"{"jsonrpc":"2.0","method":"eth_subscription","params":{"result":"0x0000000000000000000000000000000000000000000000000000000000000005","subscription":"0x43ca64edf03768e1"}}"#;
@@ -205,7 +210,8 @@ fn eth_subscribe_syncing() {
 	// given
 	let el = Runtime::with_thread_count(1);
 	let client = TestBlockChainClient::new();
-	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor());
+	let (_, pool_receiver) = mpsc::unbounded();
+	let pubsub = EthPubSubClient::new(Arc::new(client), el.executor(), pool_receiver);
 	let pubsub = pubsub.to_delegate();
 
 	let mut io = MetaIoHandler::default();