fix master branch build. change web::block output type. (#1957)

actix-http/CHANGES.md

@@ -16,6 +16,7 @@
 * `Extensions::insert` returns Option of replaced item. [#1904]
 * Remove `HttpResponseBuilder::json2()` and make `HttpResponseBuilder::json()` take a value by
   reference. [#1903]
+* Simplify `BlockingError` type to a struct. It's only triggered with blocking thread pool is dead. [#1957]  
 
 ### Removed
 * `ResponseBuilder::set`; use `ResponseBuilder::insert_header`. [#1869]
@@ -29,6 +30,7 @@
 [#1903]: https://github.com/actix/actix-web/pull/1903
 [#1904]: https://github.com/actix/actix-web/pull/1904
 [#1912]: https://github.com/actix/actix-web/pull/1912
+[#1957]: https://github.com/actix/actix-web/pull/1957
 
 
 ## 3.0.0-beta.1 - 2021-01-07

actix-http/Cargo.toml

@@ -43,7 +43,7 @@ actors = ["actix"]
 actix-service = "2.0.0-beta.3"
 actix-codec = "0.4.0-beta.1"
 actix-utils = "3.0.0-beta.1"
-actix-rt = "2.0.0-beta.2"
+actix-rt = "=2.0.0-beta.2"
 actix-tls = "3.0.0-beta.2"
 actix = { version = "0.11.0-beta.1", optional = true }
 

actix-http/src/encoding/decoder.rs

@@ -79,15 +79,8 @@ where
     ) -> Poll<Option<Self::Item>> {
         loop {
             if let Some(ref mut fut) = self.fut {
-                let (chunk, decoder) = match ready!(Pin::new(fut).poll(cx)) {
-                    Ok(Ok(item)) => item,
-                    Ok(Err(e)) => {
-                        return Poll::Ready(Some(Err(BlockingError::Error(e).into())))
-                    }
-                    Err(_) => {
-                        return Poll::Ready(Some(Err(BlockingError::Canceled.into())))
-                    }
-                };
+                let (chunk, decoder) =
+                    ready!(Pin::new(fut).poll(cx)).map_err(|_| BlockingError)??;
                 self.decoder = Some(decoder);
                 self.fut.take();
                 if let Some(chunk) = chunk {

actix-http/src/encoding/encoder.rs

@@ -136,17 +136,8 @@ impl<B: MessageBody> MessageBody for Encoder<B> {
             }
 
             if let Some(ref mut fut) = this.fut {
-                let mut encoder = match ready!(Pin::new(fut).poll(cx)) {
-                    Ok(Ok(item)) => item,
-                    Ok(Err(e)) => {
-                        return Poll::Ready(Some(Err(BlockingError::Error(e).into())))
-                    }
-                    Err(_) => {
-                        return Poll::Ready(Some(Err(
-                            BlockingError::<io::Error>::Canceled.into(),
-                        )))
-                    }
-                };
+                let mut encoder =
+                    ready!(Pin::new(fut).poll(cx)).map_err(|_| BlockingError)??;
                 let chunk = encoder.take();
                 *this.encoder = Some(encoder);
                 this.fut.take();

actix-http/src/error.rs

@@ -297,17 +297,13 @@ impl From<httparse::Error> for ParseError {
 
 /// A set of errors that can occur running blocking tasks in thread pool.
 #[derive(Debug, Display)]
-pub enum BlockingError<E: fmt::Debug> {
-    #[display(fmt = "{:?}", _0)]
-    Error(E),
-    #[display(fmt = "Thread pool is gone")]
-    Canceled,
-}
+#[display(fmt = "Blocking thread pool is gone")]
+pub struct BlockingError;
 
-impl<E: fmt::Debug> std::error::Error for BlockingError<E> {}
+impl std::error::Error for BlockingError {}
 
 /// `InternalServerError` for `BlockingError`
-impl<E: fmt::Debug> ResponseError for BlockingError<E> {}
+impl ResponseError for BlockingError {}
 
 #[derive(Display, Debug)]
 /// A set of errors that can occur during payload parsing
@@ -372,15 +368,12 @@ impl From<io::Error> for PayloadError {
     }
 }
 
-impl From<BlockingError<io::Error>> for PayloadError {
-    fn from(err: BlockingError<io::Error>) -> Self {
-        match err {
-            BlockingError::Error(e) => PayloadError::Io(e),
-            BlockingError::Canceled => PayloadError::Io(io::Error::new(
-                io::ErrorKind::Other,
-                "Operation is canceled",
-            )),
-        }
+impl From<BlockingError> for PayloadError {
+    fn from(_: BlockingError) -> Self {
+        PayloadError::Io(io::Error::new(
+            io::ErrorKind::Other,
+            "Operation is canceled",
+        ))
     }
 }