fix timing issue of streaming

the stream request and data is handle asynchronously, if the data is
handled when stream is not created yet, the data will be discarded and
an error occur.

Signed-off-by: Abel <fshb1988@gmail.com>

Author: abel-von

src/asynchronous/server.rs

@@ -381,12 +381,14 @@ impl ReaderDelegate for ServerReader {
     async fn handle_msg(&self, msg: GenMessage) {
         let handler_shutdown_waiter = self.handler_shutdown.subscribe();
         let context = self.context();
+        let (wait_tx, wait_rx) = tokio::sync::oneshot::channel::<()>();
         spawn(async move {
             select! {
-                _ = context.handle_msg(msg) => {}
+                _ = context.handle_msg(msg, wait_tx) => {}
                 _ = handler_shutdown_waiter.wait_shutdown() => {}
             }
         });
+        wait_rx.await.unwrap_or_default();
     }
 
     async fn handle_err(&self, header: MessageHeader, e: Error) {
@@ -424,7 +426,7 @@ impl HandlerContext {
             })
             .ok();
     }
-    async fn handle_msg(&self, msg: GenMessage) {
+    async fn handle_msg(&self, msg: GenMessage, wait_tx: tokio::sync::oneshot::Sender<()>) {
         let stream_id = msg.header.stream_id;
 
         if (stream_id % 2) != 1 {
@@ -438,7 +440,7 @@ impl HandlerContext {
         }
 
         match msg.header.type_ {
-            MESSAGE_TYPE_REQUEST => match self.handle_request(msg).await {
+            MESSAGE_TYPE_REQUEST => match self.handle_request(msg, wait_tx).await {
                 Ok(opt_msg) => match opt_msg {
                     Some(mut resp) => {
                         // Server: check size before sending to client
@@ -471,6 +473,8 @@ impl HandlerContext {
                 Err(status) => Self::respond_with_status(self.tx.clone(), stream_id, status).await,
             },
             MESSAGE_TYPE_DATA => {
+                // no need to wait data message handling
+                drop(wait_tx);
                 // TODO(wllenyj): Compatible with golang behavior.
                 if (msg.header.flags & FLAG_REMOTE_CLOSED) == FLAG_REMOTE_CLOSED
                     && !msg.payload.is_empty()
@@ -518,7 +522,11 @@ impl HandlerContext {
         }
     }
 
-    async fn handle_request(&self, msg: GenMessage) -> StdResult<Option<Response>, Status> {
+    async fn handle_request(
+        &self,
+        msg: GenMessage,
+        wait_tx: tokio::sync::oneshot::Sender<()>,
+    ) -> StdResult<Option<Response>, Status> {
         //TODO:
         //if header.stream_id <= self.last_stream_id {
         //    return Err;
@@ -539,10 +547,11 @@ impl HandlerContext {
         })?;
 
         if let Some(method) = srv.get_method(&req.method) {
+            drop(wait_tx);
             return self.handle_method(method, req_msg).await;
         }
         if let Some(stream) = srv.get_stream(&req.method) {
-            return self.handle_stream(stream, req_msg).await;
+            return self.handle_stream(stream, req_msg, wait_tx).await;
         }
         Err(get_status(
             Code::UNIMPLEMENTED,
@@ -598,6 +607,7 @@ impl HandlerContext {
         &self,
         stream: Arc<dyn StreamHandler + Send + Sync>,
         req_msg: Message<Request>,
+        wait_tx: tokio::sync::oneshot::Sender<()>,
     ) -> StdResult<Option<Response>, Status> {
         let stream_id = req_msg.header.stream_id;
         let req = req_msg.payload;
@@ -609,6 +619,8 @@ impl HandlerContext {
 
         let no_data = (req_msg.header.flags & FLAG_NO_DATA) == FLAG_NO_DATA;
 
+        drop(wait_tx);
+
         let si = StreamInner::new(
             stream_id,
             self.tx.clone(),