Merge pull request #893 from ethcore/closing

Additional logging and friendlier error messages

Cargo.lock

@@ -246,7 +246,7 @@ dependencies = [
  "ethminer 1.1.0",
  "ethsync 1.1.0",
  "jsonrpc-core 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "jsonrpc-http-server 3.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jsonrpc-http-server 4.0.0 (git+https://github.com/tomusdrw/jsonrpc-http-server.git)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -453,8 +453,8 @@ dependencies = [
 
 [[package]]
 name = "jsonrpc-http-server"
-version = "3.0.1"
+version = "4.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/tomusdrw/jsonrpc-http-server.git#46bd4e7cf8352e0efc940cf76d3dff99f1a3da15"
 dependencies = [
  "hyper 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",

ethcore/src/block_queue.rs

@@ -442,12 +442,14 @@ impl MayPanic for BlockQueue {
 
 impl Drop for BlockQueue {
 	fn drop(&mut self) {
+		trace!(target: "shutdown", "[BlockQueue] Closing...");
 		self.clear();
 		self.deleting.store(true, AtomicOrdering::Release);
 		self.more_to_verify.notify_all();
 		for t in self.verifiers.drain(..) {
 			t.join().unwrap();
 		}
+		trace!(target: "shutdown", "[BlockQueue] Closed.");
 	}
 }
 

parity/main.rs

@@ -270,10 +270,8 @@ fn setup_rpc_server(
 	sync: Arc<EthSync>,
 	secret_store: Arc<AccountService>,
 	miner: Arc<Miner>,
-	url: &str,
-	cors_domain: &str,
 	apis: Vec<&str>
-) -> Option<Arc<PanicHandler>> {
+) -> Option<rpc::RpcServer> {
 	use rpc::v1::*;
 
 	let server = rpc::RpcServer::new();
@@ -291,7 +289,7 @@ fn setup_rpc_server(
 			}
 		}
 	}
-	Some(server.start_http(url, cors_domain, ::num_cpus::get()))
+	Some(server)
 }
 
 #[cfg(not(feature = "rpc"))]
@@ -300,8 +298,6 @@ fn setup_rpc_server(
 	_sync: Arc<EthSync>,
 	_secret_store: Arc<AccountService>,
 	_miner: Arc<Miner>,
-	_url: &str,
-	_cors_domain: &str,
 	_apis: Vec<&str>
 ) -> Option<Arc<PanicHandler>> {
 	None
@@ -567,7 +563,10 @@ impl Configuration {
 		let account_service = Arc::new(self.account_service());
 
 		// Build client
-		let mut service = ClientService::start(self.client_config(), spec, net_settings, &Path::new(&self.path())).unwrap();
+		let mut service = ClientService::start(
+			self.client_config(), spec, net_settings, &Path::new(&self.path())
+		).unwrap_or_else(|e| die_with_error(e));
+
 		panic_handler.forward_from(&service);
 		let client = service.client();
 
@@ -582,7 +581,21 @@ impl Configuration {
 		let sync = EthSync::register(service.network(), sync_config, client.clone(), miner.clone());
 
 		// Setup rpc
-		if self.args.flag_jsonrpc || self.args.flag_rpc {
+		let rpc_server = if self.args.flag_jsonrpc || self.args.flag_rpc {
+			// TODO: use this as the API list.
+			let apis = self.args.flag_rpcapi.as_ref().unwrap_or(&self.args.flag_jsonrpc_apis);
+			setup_rpc_server(
+				service.client(),
+				sync.clone(),
+				account_service.clone(),
+				miner.clone(),
+				apis.split(',').collect()
+			)
+		} else {
+			None
+		};
+
+		let rpc_handle = rpc_server.map(|server| {
 			let url = format!("{}:{}",
 				match self.args.flag_rpcaddr.as_ref().unwrap_or(&self.args.flag_jsonrpc_interface).as_str() {
 					"all" => "0.0.0.0",
@@ -592,22 +605,14 @@ impl Configuration {
 				self.args.flag_rpcport.unwrap_or(self.args.flag_jsonrpc_port)
 			);
 			SocketAddr::from_str(&url).unwrap_or_else(|_| die!("{}: Invalid JSONRPC listen host/port given.", url));
-			let cors = self.args.flag_rpccorsdomain.as_ref().unwrap_or(&self.args.flag_jsonrpc_cors);
+			let cors_domain = self.args.flag_rpccorsdomain.as_ref().unwrap_or(&self.args.flag_jsonrpc_cors);
-			// TODO: use this as the API list.
+			let start_result = server.start_http(&url, cors_domain, ::num_cpus::get());
-			let apis = self.args.flag_rpcapi.as_ref().unwrap_or(&self.args.flag_jsonrpc_apis);
+			match start_result {
-			let server_handler = setup_rpc_server(
+				Ok(handle) => handle,
-				service.client(),
+				Err(rpc::RpcServerError::IoError(err)) => die_with_io_error(err),
-				sync.clone(),
+				Err(e) => die!("{:?}", e),
-				account_service.clone(),
-				miner.clone(),
-				&url,
-				cors,
-				apis.split(',').collect()
-			);
-			if let Some(handler) = server_handler {
-				panic_handler.forward_from(handler.deref());
 			}
-		}
+		});
 
 		// Register IO handler
 		let io_handler  = Arc::new(ClientIoHandler {
@@ -619,11 +624,11 @@ impl Configuration {
 		service.io().register_handler(io_handler).expect("Error registering IO handler");
 
 		// Handle exit
-		wait_for_exit(panic_handler);
+		wait_for_exit(panic_handler, rpc_handle);
 	}
 }
 
-fn wait_for_exit(panic_handler: Arc<PanicHandler>) {
+fn wait_for_exit(panic_handler: Arc<PanicHandler>, _rpc_handle: Option<rpc::Listening>) {
 	let exit = Arc::new(Condvar::new());
 
 	// Handle possible exits
@@ -637,6 +642,30 @@ fn wait_for_exit(panic_handler: Arc<PanicHandler>) {
 	// Wait for signal
 	let mutex = Mutex::new(());
 	let _ = exit.wait(mutex.lock().unwrap()).unwrap();
+	info!("Finishing work, please wait...");
+}
+
+fn die_with_error(e: ethcore::error::Error) -> ! {
+	use ethcore::error::Error;
+
+	match e {
+		Error::Util(UtilError::StdIo(e)) => die_with_io_error(e),
+		_ => die!("{:?}", e),
+	}
+}
+fn die_with_io_error(e: std::io::Error) -> ! {
+	match e.kind() {
+		std::io::ErrorKind::PermissionDenied => {
+			die!("No permissions to bind to specified port.")
+		},
+		std::io::ErrorKind::AddrInUse => {
+			die!("Specified address is already in use. Please make sure that nothing is listening on the same port or try using a different one.")
+		},
+		std::io::ErrorKind::AddrNotAvailable => {
+			die!("Could not use specified interface or given address is invalid.")
+		},
+		_ => die!("{:?}", e),
+	}
 }
 
 fn main() {

rpc/Cargo.toml

@@ -13,7 +13,7 @@ log = "0.3"
 serde = "0.7.0"
 serde_json = "0.7.0"
 jsonrpc-core = "2.0"
-jsonrpc-http-server = "3.0"
+jsonrpc-http-server = { git = "https://github.com/tomusdrw/jsonrpc-http-server.git" }
 ethcore-util = { path = "../util" }
 ethcore = { path = "../ethcore" }
 ethash = { path = "../ethash" }

rpc/src/lib.rs

@@ -33,10 +33,9 @@ extern crate ethminer;
 extern crate transient_hashmap;
 
 use std::sync::Arc;
-use std::thread;
-use util::panics::PanicHandler;
 use self::jsonrpc_core::{IoHandler, IoDelegate};
 
+pub use jsonrpc_http_server::{Listening, RpcServerError};
 pub mod v1;
 
 /// Http server.
@@ -45,7 +44,7 @@ pub struct RpcServer {
 }
 
 impl RpcServer {
-	/// Construct new http server object with given number of threads.
+	/// Construct new http server object.
 	pub fn new() -> RpcServer {
 		RpcServer {
 			handler: Arc::new(IoHandler::new()),
@@ -57,18 +56,12 @@ impl RpcServer {
 		self.handler.add_delegate(delegate);
 	}
 
-	/// Start server asynchronously in new thread and returns panic handler.
+	/// Start server asynchronously and returns result with `Listening` handle on success or an error.
-	pub fn start_http(&self, addr: &str, cors_domain: &str, threads: usize) -> Arc<PanicHandler> {
+	pub fn start_http(&self, addr: &str, cors_domain: &str, threads: usize) -> Result<Listening, RpcServerError> {
 		let addr = addr.to_owned();
 		let cors_domain = cors_domain.to_owned();
-		let panic_handler = PanicHandler::new_in_arc();
-		let ph = panic_handler.clone();
 		let server = jsonrpc_http_server::Server::new(self.handler.clone());
-		thread::Builder::new().name("jsonrpc_http".to_string()).spawn(move || {
+
-			ph.catch_panic(move || {
+		server.start(addr.as_ref(), jsonrpc_http_server::AccessControlAllowOrigin::Value(cors_domain), threads)
-				server.start(addr.as_ref(), jsonrpc_http_server::AccessControlAllowOrigin::Value(cors_domain), threads);
-			}).unwrap()
-		}).expect("Error while creating jsonrpc http thread");
-		panic_handler
 	}
 }

util/src/io/service.rs

@@ -376,8 +376,10 @@ impl<Message> IoService<Message> where Message: Send + Sync + Clone + 'static {
 
 impl<Message> Drop for IoService<Message> where Message: Send + Sync + Clone {
 	fn drop(&mut self) {
+		trace!(target: "shutdown", "[IoService] Closing...");
 		self.host_channel.send(IoMessage::Shutdown).unwrap();
 		self.thread.take().unwrap().join().ok();
+		trace!(target: "shutdown", "[IoService] Closed.");
 	}
 }
 

util/src/io/worker.rs

@@ -120,10 +120,12 @@ impl Worker {
 
 impl Drop for Worker {
 	fn drop(&mut self) {
+		trace!(target: "shutdown", "[IoWorker] Closing...");
 		let _ = self.wait_mutex.lock();
 		self.deleting.store(true, AtomicOrdering::Release);
 		self.wait.notify_all();
 		let thread = mem::replace(&mut self.thread, None).unwrap();
 		thread.join().ok();
+		trace!(target: "shutdown", "[IoWorker] Closed");
 	}
 }