Make endpoint handle function independent of other handlers (#29)

Author: h7kanna

src/endpoint/mod.rs

@@ -333,49 +333,70 @@ pub struct BidiStreamRunner {
 
 impl BidiStreamRunner {
     pub async fn handle(
-        mut self,
-        mut input_rx: InputReceiver,
+        self,
+        input_rx: InputReceiver,
         output_tx: OutputSender,
     ) -> Result<(), Error> {
-        Self::init_loop_vm(&mut self.vm, &mut input_rx).await?;
-
         // Retrieve the service from the Arc
         let svc = self
             .endpoint
             .svcs
             .get(&self.svc_name)
             .expect("service must exist at this point");
 
-        // Initialize handler context
-        let (handler_state_tx, handler_state_rx) = HandlerStateNotifier::new();
-        let ctx = ContextInternal::new(
+        handle(
+            input_rx,
+            output_tx,
             self.vm,
             self.svc_name,
             self.handler_name,
-            input_rx,
-            output_tx,
-            handler_state_tx,
-        );
-
-        // Start user code
-        let user_code_fut = InterceptErrorFuture::new(ctx.clone(), svc.handle(ctx.clone()));
-
-        // Wrap it in handler state aware future
-        HandlerStateAwareFuture::new(ctx.clone(), handler_state_rx, user_code_fut).await
+            svc,
+        )
+        .await
     }
+}
 
-    async fn init_loop_vm(vm: &mut CoreVM, input_rx: &mut InputReceiver) -> Result<(), ErrorInner> {
-        while !vm.is_ready_to_execute().map_err(ErrorInner::VM)? {
-            match input_rx.recv().await {
-                Some(Ok(b)) => vm.notify_input(b),
-                Some(Err(e)) => vm.notify_error(
-                    "Error when reading the body".into(),
-                    e.to_string().into(),
-                    None,
-                ),
-                None => vm.notify_input_closed(),
-            }
+#[doc(hidden)]
+pub async fn handle<S: Service<Future = BoxFuture<'static, Result<(), Error>>> + Send + Sync>(
+    mut input_rx: InputReceiver,
+    output_tx: OutputSender,
+    vm: CoreVM,
+    svc_name: String,
+    handler_name: String,
+    svc: &S,
+) -> Result<(), Error> {
+    let mut vm = vm;
+    init_loop_vm(&mut vm, &mut input_rx).await?;
+
+    // Initialize handler context
+    let (handler_state_tx, handler_state_rx) = HandlerStateNotifier::new();
+    let ctx = ContextInternal::new(
+        vm,
+        svc_name,
+        handler_name,
+        input_rx,
+        output_tx,
+        handler_state_tx,
+    );
+
+    // Start user code
+    let user_code_fut = InterceptErrorFuture::new(ctx.clone(), svc.handle(ctx.clone()));
+
+    // Wrap it in handler state aware future
+    HandlerStateAwareFuture::new(ctx.clone(), handler_state_rx, user_code_fut).await
+}
+
+async fn init_loop_vm(vm: &mut CoreVM, input_rx: &mut InputReceiver) -> Result<(), ErrorInner> {
+    while !vm.is_ready_to_execute().map_err(ErrorInner::VM)? {
+        match input_rx.recv().await {
+            Some(Ok(b)) => vm.notify_input(b),
+            Some(Err(e)) => vm.notify_error(
+                "Error when reading the body".into(),
+                e.to_string().into(),
+                None,
+            ),
+            None => vm.notify_input_closed(),
         }
-        Ok(())
     }
+    Ok(())
 }