Option to disable keep alive for JSON-RPC http transport (#9848)

* Keep alive jsonrpc CLI option.

* Update to latest json-rpc.

* Keep alive flag.

rpc/src/lib.rs

@@ -137,6 +137,7 @@ pub fn start_http<M, S, H, T>(
 	extractor: T,
 	threads: usize,
 	max_payload: usize,
+	keep_alive: bool,
 ) -> ::std::io::Result<HttpServer> where
 	M: jsonrpc_core::Metadata,
 	S: jsonrpc_core::Middleware<M>,
@@ -145,6 +146,7 @@ pub fn start_http<M, S, H, T>(
 {
 	let extractor = http_common::MetaExtractor::new(extractor);
 	Ok(http::ServerBuilder::with_meta_extractor(handler, extractor)
+		.keep_alive(keep_alive)
 		.threads(threads)
 		.cors(cors_domains.into())
 		.allowed_hosts(allowed_hosts.into())
@@ -163,6 +165,7 @@ pub fn start_http_with_middleware<M, S, H, T, R>(
 	middleware: R,
 	threads: usize,
 	max_payload: usize,
+	keep_alive: bool,
 ) -> ::std::io::Result<HttpServer> where
 	M: jsonrpc_core::Metadata,
 	S: jsonrpc_core::Middleware<M>,
@@ -172,6 +175,7 @@ pub fn start_http_with_middleware<M, S, H, T, R>(
 {
 	let extractor = http_common::MetaExtractor::new(extractor);
 	Ok(http::ServerBuilder::with_meta_extractor(handler, extractor)
+		.keep_alive(keep_alive)
 		.threads(threads)
 		.cors(cors_domains.into())
 		.allowed_hosts(allowed_hosts.into())

rpc/src/tests/rpc.rs

@@ -40,6 +40,7 @@ fn serve(handler: Option<MetaIoHandler<Metadata>>) -> Server<HttpServer> {
 		},
 		1,
 		5,
+		false,
 	).unwrap())
 }
 

rpc/src/v1/extractors.rs

@@ -218,9 +218,10 @@ impl<M: core::Middleware<Metadata>> WsDispatcher<M> {
 
 impl<M: core::Middleware<Metadata>> core::Middleware<Metadata> for WsDispatcher<M> {
 	type Future = Either<
-		core::FutureRpcResult<M::Future>,
+		core::FutureRpcResult<M::Future, M::CallFuture>,
 		core::FutureResponse,
 	>;
+	type CallFuture = core::middleware::NoopCallFuture;
 
 	fn on_request<F, X>(&self, request: core::Request, meta: Metadata, process: F)
 		-> Either<Self::Future, X>

rpc/src/v1/informant.rs

@@ -205,6 +205,7 @@ impl<T: ActivityNotifier> Middleware<T> {
 
 impl<M: core::Metadata, T: ActivityNotifier> core::Middleware<M> for Middleware<T> {
 	type Future = core::FutureResponse;
+	type CallFuture = core::middleware::NoopCallFuture;
 
 	fn on_request<F, X>(&self, request: core::Request, meta: M, process: F) -> Either<Self::Future, X> where
 		F: FnOnce(core::Request, M) -> X,