further tweaking of ipc entities lifecycle

ipc/hypervisor/src/lib.rs

@@ -240,7 +240,7 @@ mod tests {
 		::std::thread::spawn(move || {
 			while !hypervisor_ready.load(Ordering::Relaxed) { }
 
-			let client = nanoipc::init_client::<HypervisorServiceClient<_>>(url).unwrap();
+			let client = nanoipc::fast_client::<HypervisorServiceClient<_>>(url).unwrap();
 			client.handshake().unwrap();
 			client.module_ready(test_module_id);
 		});

ipc/hypervisor/src/service.rs.in

@@ -110,7 +110,7 @@ impl HypervisorService {
 		let modules = self.modules.read().unwrap();
 		modules.get(&module_id).map(|module| {
 			trace!(target: "hypervisor", "Sending shutdown to {}({})", module_id, &module.control_url);
-			let client = nanoipc::init_client::<ControlServiceClient<_>>(&module.control_url).unwrap();
+			let client = nanoipc::fast_client::<ControlServiceClient<_>>(&module.control_url).unwrap();
 			client.shutdown();
 			trace!(target: "hypervisor", "Sent shutdown to {}", module_id);
 		});

ipc/nano/Cargo.toml

@@ -10,4 +10,4 @@ license = "GPL-3.0"
 ethcore-ipc = { path = "../rpc" }
 nanomsg = { git = "https://github.com/ethcore/nanomsg.rs.git" }
 log = "0.3"
-
+lazy_static = "0.2"

ipc/nano/src/lib.rs

@@ -19,6 +19,7 @@
 extern crate ethcore_ipc as ipc;
 extern crate nanomsg;
 #[macro_use] extern crate log;
+#[macro_use] extern crate lazy_static;
 
 pub use ipc::{WithSocket, IpcInterface, IpcConfig};
 pub use nanomsg::Socket as NanoSocket;
@@ -28,7 +29,8 @@ use nanomsg::{Socket, Protocol, Error, Endpoint, PollRequest, PollFd, PollInOut}
 use std::ops::Deref;
 
 const POLL_TIMEOUT: isize = 200;
-const CLIENT_CONNECTION_TIMEOUT: isize = 120000;
+const DEFAULT_CONNECTION_TIMEOUT: isize = 30000;
+const DEBUG_CONNECTION_TIMEOUT: isize = 5000;
 
 /// Generic worker to handle service (binded) sockets
 pub struct Worker<S: ?Sized> where S: IpcInterface {
@@ -68,7 +70,7 @@ pub fn init_duplex_client<S>(socket_addr: &str) -> Result<GuardedSocket<S>, Sock
 		SocketError::DuplexLink
 	}));
 
-	socket.set_receive_timeout(CLIENT_CONNECTION_TIMEOUT).unwrap();
+	socket.set_receive_timeout(DEFAULT_CONNECTION_TIMEOUT).unwrap();
 
 	let endpoint = try!(socket.connect(socket_addr).map_err(|e| {
 		warn!(target: "ipc", "Failed to bind socket to address '{}': {:?}", socket_addr, e);
@@ -84,26 +86,58 @@ pub fn init_duplex_client<S>(socket_addr: &str) -> Result<GuardedSocket<S>, Sock
 /// Spawns client <`S`> over specified address
 /// creates socket and connects endpoint to it
 /// for request-reply connections to the service
-pub fn init_client<S>(socket_addr: &str) -> Result<GuardedSocket<S>, SocketError> where S: WithSocket<Socket> {
+pub fn client<S>(socket_addr: &str, receive_timeout: Option<isize>) -> Result<GuardedSocket<S>, SocketError> where S: WithSocket<Socket> {
 	let mut socket = try!(Socket::new(Protocol::Req).map_err(|e| {
 		warn!(target: "ipc", "Failed to create ipc socket: {:?}", e);
 		SocketError::RequestLink
 	}));
 
-	socket.set_receive_timeout(CLIENT_CONNECTION_TIMEOUT).unwrap();
+	if let Some(timeout) = receive_timeout {
+		socket.set_receive_timeout(timeout).unwrap();
+	}
 
 	let endpoint = try!(socket.connect(socket_addr).map_err(|e| {
 		warn!(target: "ipc", "Failed to bind socket to address '{}': {:?}", socket_addr, e);
 		SocketError::RequestLink
 	}));
 
-	trace!(target: "ipc", "Created cleint for {}", socket_addr);
+	trace!(target: "ipc", "Created client for {}", socket_addr);
 	Ok(GuardedSocket {
 		client: Arc::new(S::init(socket)),
 		_endpoint: endpoint,
 	})
 }
 
+lazy_static! {
+	/// Set PARITY_IPC_DEBUG=1 for fail-fast connectivity problems diagnostic
+	pub static ref DEBUG_FLAG: bool = {
+		use std::env;
+
+		if let Ok(debug) = env::var("PARITY_IPC_DEBUG") {
+			debug == "1" || debug.to_uppercase() == "TRUE"
+		}
+		else { false }
+	};
+}
+
+/// Client with no default timeout on operations
+pub fn generic_client<S>(socket_addr: &str) -> Result<GuardedSocket<S>, SocketError> where S: WithSocket<Socket> {
+	if *DEBUG_FLAG {
+		client(socket_addr, Some(DEBUG_CONNECTION_TIMEOUT))
+	} else {
+		client(socket_addr, None)
+	}
+}
+
+/// Client over interface that is supposed to give quick almost non-blocking responses
+pub fn fast_client<S>(socket_addr: &str) -> Result<GuardedSocket<S>, SocketError> where S: WithSocket<Socket> {
+	if *DEBUG_FLAG {
+		client(socket_addr, Some(DEBUG_CONNECTION_TIMEOUT))
+	} else {
+		client(socket_addr, Some(DEFAULT_CONNECTION_TIMEOUT))
+	}
+}
+
 /// Error occurred while establising socket or endpoint
 #[derive(Debug)]
 pub enum SocketError {