split service mod

src/service/map_err.rs

@@ -0,0 +1,168 @@
+use std::marker;
+
+use futures::{Async, Future, Poll};
+use tower_service::{NewService, Service};
+
+/// `MapErr` service combinator
+pub struct MapErr<A, F, E> {
+    a: A,
+    f: F,
+    e: marker::PhantomData<E>,
+}
+
+impl<A, F, E> MapErr<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    /// Create new `MapErr` combinator
+    pub fn new(a: A, f: F) -> Self {
+        Self {
+            a,
+            f,
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> Service for MapErr<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+    F: Clone,
+{
+    type Request = A::Request;
+    type Response = A::Response;
+    type Error = E;
+    type Future = MapErrFuture<A, F, E>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        self.a.poll_ready().map_err(&self.f)
+    }
+
+    fn call(&mut self, req: Self::Request) -> Self::Future {
+        MapErrFuture::new(self.a.call(req), self.f.clone())
+    }
+}
+
+pub struct MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    f: F,
+    fut: A::Future,
+}
+
+impl<A, F, E> MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    fn new(fut: A::Future, f: F) -> Self {
+        MapErrFuture { f, fut }
+    }
+}
+
+impl<A, F, E> Future for MapErrFuture<A, F, E>
+where
+    A: Service,
+    F: Fn(A::Error) -> E,
+{
+    type Item = A::Response;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        self.fut.poll().map_err(&self.f)
+    }
+}
+
+/// `MapErrNewService` new service combinator
+pub struct MapErrNewService<A, F, E> {
+    a: A,
+    f: F,
+    e: marker::PhantomData<E>,
+}
+
+impl<A, F, E> MapErrNewService<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    /// Create new `MapErr` new service instance
+    pub fn new(a: A, f: F) -> Self {
+        Self {
+            a,
+            f,
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> Clone for MapErrNewService<A, F, E>
+where
+    A: NewService + Clone,
+    F: Fn(A::Error) -> E + Clone,
+{
+    fn clone(&self) -> Self {
+        Self {
+            a: self.a.clone(),
+            f: self.f.clone(),
+            e: marker::PhantomData,
+        }
+    }
+}
+
+impl<A, F, E> NewService for MapErrNewService<A, F, E>
+where
+    A: NewService + Clone,
+    F: Fn(A::Error) -> E + Clone,
+{
+    type Request = A::Request;
+    type Response = A::Response;
+    type Error = E;
+    type Service = MapErr<A::Service, F, E>;
+
+    type InitError = A::InitError;
+    type Future = MapErrNewServiceFuture<A, F, E>;
+
+    fn new_service(&self) -> Self::Future {
+        MapErrNewServiceFuture::new(self.a.new_service(), self.f.clone())
+    }
+}
+
+pub struct MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    fut: A::Future,
+    f: F,
+}
+
+impl<A, F, E> MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E,
+{
+    fn new(fut: A::Future, f: F) -> Self {
+        MapErrNewServiceFuture { f, fut }
+    }
+}
+
+impl<A, F, E> Future for MapErrNewServiceFuture<A, F, E>
+where
+    A: NewService,
+    F: Fn(A::Error) -> E + Clone,
+{
+    type Item = MapErr<A::Service, F, E>;
+    type Error = A::InitError;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        if let Async::Ready(service) = self.fut.poll()? {
+            Ok(Async::Ready(MapErr::new(service, self.f.clone())))
+        } else {
+            Ok(Async::NotReady)
+        }
+    }
+}