feat: Use http::Extensions directly (#1710)

tonic/src/extensions.rs

@@ -1,78 +1,3 @@
-use std::fmt;
-
-/// A type map of protocol extensions.
-///
-/// `Extensions` can be used by [`Interceptor`] and [`Request`] to store extra data derived from
-/// the underlying protocol.
-///
-/// [`Interceptor`]: crate::service::Interceptor
-/// [`Request`]: crate::Request
-#[derive(Default)]
-pub struct Extensions {
-    inner: http::Extensions,
-}
-
-impl Extensions {
-    pub(crate) fn new() -> Self {
-        Self {
-            inner: http::Extensions::new(),
-        }
-    }
-
-    /// Insert a type into this `Extensions`.
-    ///
-    /// If a extension of this type already existed, it will
-    /// be returned.
-    #[inline]
-    pub fn insert<T: Clone + Send + Sync + 'static>(&mut self, val: T) -> Option<T> {
-        self.inner.insert(val)
-    }
-
-    /// Get a reference to a type previously inserted on this `Extensions`.
-    #[inline]
-    pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T> {
-        self.inner.get()
-    }
-
-    /// Get a mutable reference to a type previously inserted on this `Extensions`.
-    #[inline]
-    pub fn get_mut<T: Send + Sync + 'static>(&mut self) -> Option<&mut T> {
-        self.inner.get_mut()
-    }
-
-    /// Remove a type from this `Extensions`.
-    ///
-    /// If a extension of this type existed, it will be returned.
-    #[inline]
-    pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T> {
-        self.inner.remove()
-    }
-
-    /// Clear the `Extensions` of all inserted extensions.
-    #[inline]
-    pub fn clear(&mut self) {
-        self.inner.clear()
-    }
-
-    #[inline]
-    /// Convert from `http::Extensions`
-    pub fn from_http(http: http::Extensions) -> Self {
-        Self { inner: http }
-    }
-
-    /// Convert to `http::Extensions` and consume self.
-    #[inline]
-    pub fn into_http(self) -> http::Extensions {
-        self.inner
-    }
-}
-
-impl fmt::Debug for Extensions {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Extensions").finish()
-    }
-}
-
 /// A gRPC Method info extension.
 #[derive(Debug, Clone)]
 pub struct GrpcMethod {

tonic/src/lib.rs

@@ -119,7 +119,8 @@ pub use async_trait::async_trait;
 
 #[doc(inline)]
 pub use codec::Streaming;
-pub use extensions::{Extensions, GrpcMethod};
+pub use extensions::GrpcMethod;
+pub use http::Extensions;
 pub use request::{IntoRequest, IntoStreamingRequest, Request};
 pub use response::Response;
 pub use status::{Code, Status};

tonic/src/request.rs

@@ -3,7 +3,7 @@ use crate::metadata::{MetadataMap, MetadataValue};
 use crate::transport::server::TcpConnectInfo;
 #[cfg(feature = "tls")]
 use crate::transport::server::TlsConnectInfo;
-use crate::Extensions;
+use http::Extensions;
 #[cfg(feature = "transport")]
 use std::net::SocketAddr;
 #[cfg(feature = "tls")]
@@ -161,7 +161,7 @@ impl<T> Request<T> {
         Request {
             metadata: MetadataMap::from_headers(parts.headers),
             message,
-            extensions: Extensions::from_http(parts.extensions),
+            extensions: parts.extensions,
         }
     }
 
@@ -187,7 +187,7 @@ impl<T> Request<T> {
             SanitizeHeaders::Yes => self.metadata.into_sanitized_headers(),
             SanitizeHeaders::No => self.metadata.into_headers(),
         };
-        *request.extensions_mut() = self.extensions.into_http();
+        *request.extensions_mut() = self.extensions;
 
         request
     }

tonic/src/response.rs

@@ -1,4 +1,6 @@
-use crate::{metadata::MetadataMap, Extensions};
+use http::Extensions;
+
+use crate::metadata::MetadataMap;
 
 /// A gRPC response and metadata from an RPC call.
 #[derive(Debug)]
@@ -73,7 +75,7 @@ impl<T> Response<T> {
         Response {
             metadata: MetadataMap::from_headers(head.headers),
             message,
-            extensions: Extensions::from_http(head.extensions),
+            extensions: head.extensions,
         }
     }
 
@@ -82,7 +84,7 @@ impl<T> Response<T> {
 
         *res.version_mut() = http::Version::HTTP_2;
         *res.headers_mut() = self.metadata.into_sanitized_headers();
-        *res.extensions_mut() = self.extensions.into_http();
+        *res.extensions_mut() = self.extensions;
 
         res
     }