Start simplifying TaskSpawner

beacon_node/http_api/src/task_spawner.rs

@@ -35,42 +35,6 @@ impl<E: EthSpec> TaskSpawner<E> {
         }
     }
 
-    pub async fn blocking_json_task<F, T>(
-        self,
-        priority: Priority,
-        func: F,
-    ) -> Result<Response, warp::Rejection>
-    where
-        F: FnOnce() -> Result<T, warp::Rejection> + Send + Sync + 'static,
-        T: Serialize + Send + 'static,
-    {
-        if let Some(beacon_processor_send) = &self.beacon_processor_send {
-            // Create a closure that will execute `func` and send the result to
-            // a channel held by this thread.
-            let (tx, rx) = oneshot::channel();
-            let process_fn = move || {
-                // Execute the function, collect the return value.
-                let func_result = func();
-                // Send the result down the channel. Ignore any failures; the
-                // send can only fail if the receiver is dropped.
-                let _ = tx.send(func_result);
-            };
-
-            // Send the function to the beacon processor for execution at some arbitrary time.
-            send_to_beacon_processor(
-                beacon_processor_send,
-                priority,
-                BlockingOrAsync::Blocking(Box::new(process_fn)),
-                rx,
-            )
-            .await
-        } else {
-            // There is no beacon processor so spawn a task directly on the
-            // tokio executor.
-            warp_utils::task::blocking_json_task(func).await
-        }
-    }
-
     pub async fn blocking_response_task<F, T>(
         self,
         priority: Priority,
@@ -91,34 +55,19 @@ impl<E: EthSpec> TaskSpawner<E> {
                 // send can only fail if the receiver is dropped.
                 let _ = tx.send(func_result);
             };
-            let process_fn = BlockingOrAsync::Blocking(Box::new(process_fn));
 
-            let error_message =
-                match beacon_processor_send.try_send(priority.work_event(process_fn)) {
-                    Ok(()) => {
-                        match rx.await {
-                // The beacon processor executed the task and sent a result.
-                Ok(func_result) => {
-                    return func_result.map(Reply::into_response)
-                }
-                // The beacon processor dropped the channel without sending a
-                // result. The beacon processor dropped this task because its
-                // queues are full or it's shutting down.
-                Err(_) => "The task did not execute. The server is overloaded or shutting down.",
-            }
-                    }
-                    Err(TrySendError::Full(_)) => "The task was dropped. The server is overloaded.",
-                    Err(TrySendError::Closed(_)) => {
-                        "The task was dropped. The server is shutting down."
-                    }
-                };
-
-            let error_response = warp::reply::with_status(
-                warp::reply::json(&error_message),
-                eth2::StatusCode::INTERNAL_SERVER_ERROR,
+            // Send the function to the beacon processor for execution at some arbitrary time.
+            match send_to_beacon_processor(
+                beacon_processor_send,
+                priority,
+                BlockingOrAsync::Blocking(Box::new(process_fn)),
+                rx,
             )
-            .into_response();
-            Ok(error_response)
+            .await
+            {
+                Ok(result) => result.map(Reply::into_response),
+                Err(error_response) => Ok(error_response),
+            }
         } else {
             // There is no beacon processor so spawn a task directly on the
             // tokio executor.
@@ -126,6 +75,19 @@ impl<E: EthSpec> TaskSpawner<E> {
         }
     }
 
+    pub async fn blocking_json_task<F, T>(
+        self,
+        priority: Priority,
+        func: F,
+    ) -> Result<Response, warp::Rejection>
+    where
+        F: FnOnce() -> Result<T, warp::Rejection> + Send + Sync + 'static,
+        T: Serialize + Send + 'static,
+    {
+        let func = || func().map(|t| warp::reply::json(&t).into_response());
+        self.blocking_response_task(priority, func).await
+    }
+
     pub async fn spawn_async_with_rejection(
         self,
         priority: Priority,
@@ -247,18 +209,13 @@ async fn send_to_beacon_processor<E: EthSpec, T>(
     beacon_processor_send: &BeaconProcessorSend<E>,
     priority: Priority,
     process_fn: BlockingOrAsync,
-    rx: oneshot::Receiver<Result<T, warp::Rejection>>,
-) -> Result<Response, warp::Rejection>
-where
-    T: Serialize + Send + 'static,
-{
+    rx: oneshot::Receiver<T>,
+) -> Result<T, Response> {
     let error_message = match beacon_processor_send.try_send(priority.work_event(process_fn)) {
         Ok(()) => {
             match rx.await {
                 // The beacon processor executed the task and sent a result.
-                Ok(func_result) => {
-                    return func_result.map(|r| warp::reply::json(&r).into_response())
-                }
+                Ok(func_result) => return Ok(func_result),
                 // The beacon processor dropped the channel without sending a
                 // result. The beacon processor dropped this task because its
                 // queues are full or it's shutting down.
@@ -274,5 +231,5 @@ where
         eth2::StatusCode::INTERNAL_SERVER_ERROR,
     )
     .into_response();
-    Ok(error_response)
+    Err(error_response)
 }