1 files changed, 99 insertions, 0 deletions
diff --git a/vendor/tower/src/util/map_result.rs b/vendor/tower/src/util/map_result.rs
new file mode 100644
index 00000000..5a96af2d
--- /dev/null
+++ b/vendor/tower/src/util/map_result.rs
@@ -0,0 +1,99 @@
+use futures_util::{future::Map, FutureExt};
+use std::fmt;
+use std::task::{Context, Poll};
+use tower_layer::Layer;
+use tower_service::Service;
+
+/// Service returned by the [`map_result`] combinator.
+///
+/// [`map_result`]: crate::util::ServiceExt::map_result
+#[derive(Clone)]
+pub struct MapResult<S, F> {
+    inner: S,
+    f: F,
+}
+
+impl<S, F> fmt::Debug for MapResult<S, F>
+where
+    S: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("MapResult")
+            .field("inner", &self.inner)
+            .field("f", &format_args!("{}", std::any::type_name::<F>()))
+            .finish()
+    }
+}
+
+/// A [`Layer`] that produces a [`MapResult`] service.
+///
+/// [`Layer`]: tower_layer::Layer
+#[derive(Debug, Clone)]
+pub struct MapResultLayer<F> {
+    f: F,
+}
+
+opaque_future! {
+    /// Response future from [`MapResult`] services.
+    ///
+    /// [`MapResult`]: crate::util::MapResult
+    pub type MapResultFuture<F, N> = Map<F, N>;
+}
+
+impl<S, F> MapResult<S, F> {
+    /// Creates a new [`MapResult`] service.
+    pub const fn new(inner: S, f: F) -> Self {
+        MapResult { f, inner }
+    }
+
+    /// Returns a new [`Layer`] that produces [`MapResult`] services.
+    ///
+    /// This is a convenience function that simply calls [`MapResultLayer::new`].
+    ///
+    /// [`Layer`]: tower_layer::Layer
+    pub fn layer(f: F) -> MapResultLayer<F> {
+        MapResultLayer { f }
+    }
+}
+
+impl<S, F, Request, Response, Error> Service<Request> for MapResult<S, F>
+where
+    S: Service<Request>,
+    Error: From<S::Error>,
+    F: FnOnce(Result<S::Response, S::Error>) -> Result<Response, Error> + Clone,
+{
+    type Response = Response;
+    type Error = Error;
+    type Future = MapResultFuture<S::Future, F>;
+
+    #[inline]
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.inner.poll_ready(cx).map_err(Into::into)
+    }
+
+    #[inline]
+    fn call(&mut self, request: Request) -> Self::Future {
+        MapResultFuture::new(self.inner.call(request).map(self.f.clone()))
+    }
+}
+
+impl<F> MapResultLayer<F> {
+    /// Creates a new [`MapResultLayer`] layer.
+    pub const fn new(f: F) -> Self {
+        MapResultLayer { f }
+    }
+}
+
+impl<S, F> Layer<S> for MapResultLayer<F>
+where
+    F: Clone,
+{
+    type Service = MapResult<S, F>;
+
+    fn layer(&self, inner: S) -> Self::Service {
+        MapResult {
+            f: self.f.clone(),
+            inner,
+        }
+    }
+}