Cleanup stratum a bit (#11161)

* Cleanup stratum a bit

Salvage some code from https://github.com/paritytech/parity-ethereum/pull/10884 + some cleanup and typos.

* HashSet::new does not allocate before first insert

* Remove unused method push_work()

ethcore/src/miner/stratum.rs

@@ -225,8 +225,6 @@ impl NotifyWork for Stratum {
 
 		self.service.push_work_all(
 			self.dispatcher.payload(pow_hash, difficulty, number)
-		).unwrap_or_else(
-			|e| warn!(target: "stratum", "Error while pushing work: {:?}", e)
 		);
 	}
 }
@@ -239,16 +237,13 @@ impl Stratum {
 
 		let dispatcher = Arc::new(StratumJobDispatcher::new(miner, client));
 
-		let stratum_svc = StratumService::start(
+		let service = StratumService::start(
 			&SocketAddr::new(options.listen_addr.parse::<IpAddr>()?, options.port),
 			dispatcher.clone(),
 			options.secret.clone(),
 		)?;
 
-		Ok(Stratum {
-			dispatcher: dispatcher,
-			service: stratum_svc,
-		})
+		Ok(Stratum { dispatcher, service })
 	}
 
 	/// Start STRATUM job dispatcher and register it in the miner

miner/stratum/src/lib.rs

@@ -76,7 +76,7 @@ impl Stratum {
 
 		let implementation = Arc::new(StratumImpl {
 			subscribers: RwLock::default(),
-			job_que: RwLock::default(),
+			job_queue: RwLock::default(),
 			dispatcher,
 			workers: Arc::new(RwLock::default()),
 			secret,
@@ -106,13 +106,9 @@ impl Stratum {
 }
 
 impl PushWorkHandler for Stratum {
-	fn push_work_all(&self, payload: String) -> Result<(), Error> {
+	fn push_work_all(&self, payload: String) {
 		self.implementation.push_work_all(payload, &self.tcp_dispatcher)
 	}
-
-	fn push_work(&self, payloads: Vec<String>) -> Result<(), Error> {
-		self.implementation.push_work(payloads, &self.tcp_dispatcher)
-	}
 }
 
 impl Drop for Stratum {
@@ -126,14 +122,14 @@ struct StratumImpl {
 	/// Subscribed clients
 	subscribers: RwLock<Vec<SocketAddr>>,
 	/// List of workers supposed to receive job update
-	job_que: RwLock<HashSet<SocketAddr>>,
+	job_queue: RwLock<HashSet<SocketAddr>>,
 	/// Payload manager
 	dispatcher: Arc<dyn JobDispatcher>,
 	/// Authorized workers (socket - worker_id)
 	workers: Arc<RwLock<HashMap<SocketAddr, String>>>,
 	/// Secret if any
 	secret: Option<H256>,
-	/// Dispatch notify couinter
+	/// Dispatch notify counter
 	notify_counter: RwLock<u32>,
 }
 
@@ -143,7 +139,7 @@ impl StratumImpl {
 		use std::str::FromStr;
 
 		self.subscribers.write().push(meta.addr().clone());
-		self.job_que.write().insert(meta.addr().clone());
+		self.job_queue.write().insert(meta.addr().clone());
 		trace!(target: "stratum", "Subscription request from {:?}", meta.addr());
 
 		Ok(match self.dispatcher.initial() {
@@ -160,7 +156,7 @@ impl StratumImpl {
 
 	/// rpc method `mining.authorize`
 	fn authorize(&self, params: Params, meta: SocketMetadata) -> RpcResult {
-		params.parse::<(String, String)>().map(|(worker_id, secret)|{
+		params.parse::<(String, String)>().map(|(worker_id, secret)| {
 			if let Some(valid_secret) = self.secret {
 				let hash = keccak(secret);
 				if hash != valid_secret {
@@ -204,36 +200,37 @@ impl StratumImpl {
 	/// Helper method
 	fn update_peers(&self, tcp_dispatcher: &Dispatcher) {
 		if let Some(job) = self.dispatcher.job() {
-			if let Err(e) = self.push_work_all(job, tcp_dispatcher) {
-				warn!("Failed to update some of the peers: {:?}", e);
-			}
+			self.push_work_all(job, tcp_dispatcher)
 		}
 	}
 
-	fn push_work_all(&self, payload: String, tcp_dispatcher: &Dispatcher) -> Result<(), Error> {
+	fn push_work_all(&self, payload: String, tcp_dispatcher: &Dispatcher) {
 		let hup_peers = {
 			let workers = self.workers.read();
 			let next_request_id = {
 				let mut counter = self.notify_counter.write();
-				if *counter == ::std::u32::MAX { *counter = NOTIFY_COUNTER_INITIAL; }
-				else { *counter = *counter + 1 }
+				if *counter == ::std::u32::MAX {
+					*counter = NOTIFY_COUNTER_INITIAL;
+				} else {
+					*counter = *counter + 1
+				}
 				*counter
 			};
 
-			let mut hup_peers = HashSet::with_capacity(0); // most of the cases won't be needed, hence avoid allocation
+			let mut hup_peers = HashSet::new();
 			let workers_msg = format!("{{ \"id\": {}, \"method\": \"mining.notify\", \"params\": {} }}", next_request_id, payload);
 			trace!(target: "stratum", "pushing work for {} workers (payload: '{}')", workers.len(), &workers_msg);
-			for (ref addr, _) in workers.iter() {
+			for (addr, _) in workers.iter() {
 				trace!(target: "stratum", "pusing work to {}", addr);
 				match tcp_dispatcher.push_message(addr, workers_msg.clone()) {
 					Err(PushMessageError::NoSuchPeer) => {
-						trace!(target: "stratum", "Worker no longer connected: {}", &addr);
-						hup_peers.insert(*addr.clone());
+						trace!(target: "stratum", "Worker no longer connected: {}", addr);
+						hup_peers.insert(addr.clone());
 					},
 					Err(e) => {
 						warn!(target: "stratum", "Unexpected transport error: {:?}", e);
 					},
-					Ok(_) => { },
+					Ok(_) => {},
 				}
 			}
 			hup_peers
@@ -241,33 +238,10 @@ impl StratumImpl {
 
 		if !hup_peers.is_empty() {
 			let mut workers = self.workers.write();
-			for hup_peer in hup_peers { workers.remove(&hup_peer); }
+			for hup_peer in hup_peers {
+				workers.remove(&hup_peer);
 			}
-
-		Ok(())
 		}
-
-	fn push_work(&self, payloads: Vec<String>, tcp_dispatcher: &Dispatcher) -> Result<(), Error> {
-		if !payloads.len() > 0 {
-			return Err(Error::NoWork);
-		}
-		let workers = self.workers.read();
-		let addrs = workers.keys().collect::<Vec<&SocketAddr>>();
-		if !workers.len() > 0 {
-			return Err(Error::NoWorkers);
-		}
-		let mut que = payloads;
-		let mut addr_index = 0;
-		while que.len() > 0 {
-			let next_worker = addrs[addr_index];
-			let mut next_payload = que.drain(0..1);
-			tcp_dispatcher.push_message(
-				next_worker,
-				next_payload.nth(0).expect("drained successfully of 0..1, so 0-th element should exist")
-			)?;
-			addr_index = addr_index + 1;
-		}
-		Ok(())
 	}
 }
 
@@ -475,8 +449,7 @@ mod tests {
 			.map_err(|err: timeout::Error<()>| panic!("Timeout: {:?}", err))
 			.and_then(move |stream| {
 				trace!(target: "stratum", "Pusing work to peers");
-				stratum.push_work_all(r#"{ "00040008", "100500" }"#.to_owned())
-					.expect("Pushing work should produce no errors");
+				stratum.push_work_all(r#"{ "00040008", "100500" }"#.to_owned());
 				Timeout::new(future::ok(stream), ::std::time::Duration::from_millis(100))
 			})
 			.map_err(|err: timeout::Error<()>| panic!("Timeout: {:?}", err))

miner/stratum/src/traits.rs

@@ -55,10 +55,7 @@ pub trait JobDispatcher: Send + Sync {
 /// Interface that can handle requests to push job for workers
 pub trait PushWorkHandler: Send + Sync {
 	/// push the same work package for all workers (`payload`: json of pow-specific set of work specification)
-	fn push_work_all(&self, payload: String) -> Result<(), Error>;
-
-	/// push the work packages worker-wise (`payload`: json of pow-specific set of work specification)
-	fn push_work(&self, payloads: Vec<String>) -> Result<(), Error>;
+	fn push_work_all(&self, payload: String);
 }
 
 pub struct ServiceConfiguration {