add forward_ready macro

actix-service/src/apply.rs

@@ -94,9 +94,7 @@ where
     type Error = Err;
     type Future = Fut;
 
-    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
-        Poll::Ready(ready!(self.service.poll_ready(cx)))
-    }
+    crate::forward_ready!(service);
 
     fn call(&mut self, req: Req) -> Self::Future {
         (self.wrap_fn)(req, &mut self.service)

actix-service/src/lib.rs

@@ -371,3 +371,15 @@ macro_rules! always_ready {
         }
     };
 }
+
+#[macro_export]
+macro_rules! forward_ready {
+    ($field:ident) => {
+        fn poll_ready(
+            &mut self,
+            cx: &mut ::std::task::Context<'_>,
+        ) -> ::std::task::Poll<Result<(), Self::Error>> {
+            self.$field.poll_ready(cx)
+        }
+    };
+}

actix-service/src/map.rs

@@ -52,9 +52,7 @@ where
     type Error = A::Error;
     type Future = MapFuture<A, F, Req, Res>;
 
-    fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
-        self.service.poll_ready(ctx)
-    }
+    crate::forward_ready!(service);
 
     fn call(&mut self, req: Req) -> Self::Future {
         MapFuture::new(self.service.call(req), self.f.clone())

actix-tracing/src/lib.rs

@@ -5,7 +5,6 @@
 #![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
 
 use std::marker::PhantomData;
-use std::task::{Context, Poll};
 
 use actix_service::{
     apply, dev::ApplyTransform, IntoServiceFactory, Service, ServiceFactory, Transform,
@@ -36,9 +35,7 @@ where
     type Error = S::Error;
     type Future = Either<S::Future, Instrumented<S::Future>>;
 
-    fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
-        self.inner.poll_ready(ctx)
-    }
+    actix_service::forward_ready!(inner);
 
     fn call(&mut self, req: Req) -> Self::Future {
         let span = (self.make_span)(&req);