Asynchronous RPC support (#2017)

* Async RPC

* Limiting number of transactions in queue

* Fixing tests

* Bumping serde and jsonrpc-core

* serde updated to 0.8

* fixed failing tests

* Bumping ipc server

* Fixing API for endpoints

* Experimenting with tests without --release mode

dapps/src/apps/fetcher.rs

@@ -26,7 +26,7 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicBool};
 use rustc_serialize::hex::FromHex;
 
-use hyper::Control;
+use hyper;
 use hyper::status::StatusCode;
 
 use random_filename;
@@ -85,7 +85,7 @@ impl<R: URLHint> AppFetcher<R> {
 		}
 	}
 
-	pub fn to_handler(&self, path: EndpointPath, control: Control) -> Box<Handler> {
+	pub fn to_async_handler(&self, path: EndpointPath, control: hyper::Control) -> Box<Handler> {
 		let mut dapps = self.dapps.lock();
 		let app_id = path.app_id.clone();
 
@@ -94,7 +94,7 @@ impl<R: URLHint> AppFetcher<R> {
 			match status {
 				// Just server dapp
 				Some(&mut ContentStatus::Ready(ref endpoint)) => {
-					(None, endpoint.to_handler(path))
+					(None, endpoint.to_async_handler(path, control))
 				},
 				// App is already being fetched
 				Some(&mut ContentStatus::Fetching(_)) => {

dapps/src/endpoint.rs

@@ -16,7 +16,7 @@
 
 //! URL Endpoint traits
 
-use hyper::{server, net};
+use hyper::{self, server, net};
 use std::collections::BTreeMap;
 
 #[derive(Debug, PartialEq, Default, Clone)]
@@ -43,4 +43,8 @@ pub trait Endpoint : Send + Sync {
 	fn info(&self) -> Option<&EndpointInfo> { None }
 
 	fn to_handler(&self, path: EndpointPath) -> Box<Handler>;
+
+	fn to_async_handler(&self, path: EndpointPath, _control: hyper::Control) -> Box<Handler> {
+		self.to_handler(path)
+	}
 }

dapps/src/router/mod.rs

@@ -73,20 +73,20 @@ impl<A: Authorization + 'static> server::Handler<HttpStream> for Router<A> {
 		// Choose proper handler depending on path / domain
 		let url = extract_url(&req);
 		let endpoint = extract_endpoint(&url);
+		let control = self.control.take().expect("on_request is called only once; control is always defined at start; qed");
 
 		self.handler = match endpoint {
 			// First check special endpoints
 			(ref path, ref endpoint) if self.special.contains_key(endpoint) => {
-				self.special.get(endpoint).unwrap().to_handler(path.clone().unwrap_or_default())
+				self.special.get(endpoint).unwrap().to_async_handler(path.clone().unwrap_or_default(), control)
 			},
 			// Then delegate to dapp
 			(Some(ref path), _) if self.endpoints.contains_key(&path.app_id) => {
-				self.endpoints.get(&path.app_id).unwrap().to_handler(path.clone())
+				self.endpoints.get(&path.app_id).unwrap().to_async_handler(path.clone(), control)
 			},
 			// Try to resolve and fetch the dapp
 			(Some(ref path), _) if self.fetch.contains(&path.app_id) => {
-				let control = self.control.take().expect("on_request is called only once, thus control is always defined.");
-				self.fetch.to_handler(path.clone(), control)
+				self.fetch.to_async_handler(path.clone(), control)
 			},
 			// Redirection to main page (maybe 404 instead?)
 			(Some(ref path), _) if *req.method() == hyper::method::Method::Get => {
@@ -100,7 +100,7 @@ impl<A: Authorization + 'static> server::Handler<HttpStream> for Router<A> {
 			},
 			// RPC by default
 			_ => {
-				self.special.get(&SpecialEndpoint::Rpc).unwrap().to_handler(EndpointPath::default())
+				self.special.get(&SpecialEndpoint::Rpc).unwrap().to_async_handler(EndpointPath::default(), control)
 			}
 		};
 
@@ -135,7 +135,7 @@ impl<A: Authorization> Router<A> {
 		allowed_hosts: Option<Vec<String>>,
 		) -> Self {
 
-		let handler = special.get(&SpecialEndpoint::Rpc).unwrap().to_handler(EndpointPath::default());
+		let handler = special.get(&SpecialEndpoint::Api).unwrap().to_handler(EndpointPath::default());
 		Router {
 			control: Some(control),
 			main_page: main_page,

dapps/src/rpc.rs

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::sync::{Arc, Mutex};
+use hyper;
 use jsonrpc_core::IoHandler;
 use jsonrpc_http_server::{ServerHandler, PanicHandler, AccessControlAllowOrigin};
 use endpoint::{Endpoint, EndpointPath, Handler};
@@ -38,7 +39,17 @@ struct RpcEndpoint {
 
 impl Endpoint for RpcEndpoint {
 	fn to_handler(&self, _path: EndpointPath) -> Box<Handler> {
+		panic!("RPC Endpoint is asynchronous and requires Control object.");
+	}
+
+	fn to_async_handler(&self, _path: EndpointPath, control: hyper::Control) -> Box<Handler> {
 		let panic_handler = PanicHandler { handler: self.panic_handler.clone() };
-		Box::new(ServerHandler::new(self.handler.clone(), self.cors_domain.clone(), self.allowed_hosts.clone(), panic_handler))
+		Box::new(ServerHandler::new(
+				self.handler.clone(),
+				self.cors_domain.clone(),
+				self.allowed_hosts.clone(),
+				panic_handler,
+				control,
+		))
 	}
 }