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| </pre><pre class="rust"><code><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codec::compression::{ |
| CompressionEncoding, EnabledCompressionEncodings, SingleMessageCompressionOverride, |
| }; |
| <span class="kw">use crate</span>::{ |
| body::BoxBody, |
| codec::{encode_server, Codec, Streaming}, |
| server::{ClientStreamingService, ServerStreamingService, StreamingService, UnaryService}, |
| Code, Request, Status, |
| }; |
| <span class="kw">use </span>futures_core::TryStream; |
| <span class="kw">use </span>futures_util::{future, stream, TryStreamExt}; |
| <span class="kw">use </span>http_body::Body; |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="macro">macro_rules! </span>t { |
| (<span class="macro-nonterminal">$result</span>:expr) => { |
| <span class="kw">match </span><span class="macro-nonterminal">$result </span>{ |
| <span class="prelude-val">Ok</span>(value) => value, |
| <span class="prelude-val">Err</span>(status) => <span class="kw">return </span>status.to_http(), |
| } |
| }; |
| } |
| |
| <span class="doccomment">/// A gRPC Server handler. |
| /// |
| /// This will wrap some inner [`Codec`] and provide utilities to handle |
| /// inbound unary, client side streaming, server side streaming, and |
| /// bi-directional streaming. |
| /// |
| /// Each request handler method accepts some service that implements the |
| /// corresponding service trait and a http request that contains some body that |
| /// implements some [`Body`]. |
| </span><span class="kw">pub struct </span>Grpc<T> { |
| codec: T, |
| <span class="doccomment">/// Which compression encodings does the server accept for requests? |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_compression_encodings: EnabledCompressionEncodings, |
| <span class="doccomment">/// Which compression encodings might the server use for responses. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>send_compression_encodings: EnabledCompressionEncodings, |
| } |
| |
| <span class="kw">impl</span><T> Grpc<T> |
| <span class="kw">where |
| </span>T: Codec, |
| { |
| <span class="doccomment">/// Creates a new gRPC server with the provided [`Codec`]. |
| </span><span class="kw">pub fn </span>new(codec: T) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| codec, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_compression_encodings: EnabledCompressionEncodings::default(), |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>send_compression_encodings: EnabledCompressionEncodings::default(), |
| } |
| } |
| |
| <span class="doccomment">/// Enable accepting `gzip` compressed requests. |
| /// |
| /// If a request with an unsupported encoding is received the server will respond with |
| /// [`Code::UnUnimplemented`](crate::Code). |
| /// |
| /// # Example |
| /// |
| /// The most common way of using this is through a server generated by tonic-build: |
| /// |
| /// ```rust |
| /// # struct Svc; |
| /// # struct ExampleServer<T>(T); |
| /// # impl<T> ExampleServer<T> { |
| /// # fn new(svc: T) -> Self { Self(svc) } |
| /// # fn accept_gzip(self) -> Self { self } |
| /// # } |
| /// # #[tonic::async_trait] |
| /// # trait Example {} |
| /// |
| /// #[tonic::async_trait] |
| /// impl Example for Svc { |
| /// // ... |
| /// } |
| /// |
| /// let service = ExampleServer::new(Svc).accept_gzip(); |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"compression"</span>)))] |
| </span><span class="kw">pub fn </span>accept_gzip(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.accept_compression_encodings.enable_gzip(); |
| <span class="self">self |
| </span>} |
| |
| <span class="attribute">#[doc(hidden)] |
| #[cfg(not(feature = <span class="string">"compression"</span>))] |
| </span><span class="kw">pub fn </span>accept_gzip(<span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="macro">panic!</span>(<span class="string">"`accept_gzip` called on a server but the `compression` feature is not enabled on tonic"</span>); |
| } |
| |
| <span class="doccomment">/// Enable sending `gzip` compressed responses. |
| /// |
| /// Requires the client to also support receiving compressed responses. |
| /// |
| /// # Example |
| /// |
| /// The most common way of using this is through a server generated by tonic-build: |
| /// |
| /// ```rust |
| /// # struct Svc; |
| /// # struct ExampleServer<T>(T); |
| /// # impl<T> ExampleServer<T> { |
| /// # fn new(svc: T) -> Self { Self(svc) } |
| /// # fn send_gzip(self) -> Self { self } |
| /// # } |
| /// # #[tonic::async_trait] |
| /// # trait Example {} |
| /// |
| /// #[tonic::async_trait] |
| /// impl Example for Svc { |
| /// // ... |
| /// } |
| /// |
| /// let service = ExampleServer::new(Svc).send_gzip(); |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"compression"</span>)))] |
| </span><span class="kw">pub fn </span>send_gzip(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.send_compression_encodings.enable_gzip(); |
| <span class="self">self |
| </span>} |
| |
| <span class="attribute">#[doc(hidden)] |
| #[cfg(not(feature = <span class="string">"compression"</span>))] |
| </span><span class="kw">pub fn </span>send_gzip(<span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="macro">panic!</span>( |
| <span class="string">"`send_gzip` called on a server but the `compression` feature is not enabled on tonic" |
| </span>); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| #[doc(hidden)] |
| </span><span class="kw">pub fn </span>apply_compression_config( |
| <span class="self">self</span>, |
| accept_encodings: EnabledCompressionEncodings, |
| send_encodings: EnabledCompressionEncodings, |
| ) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>this = <span class="self">self</span>; |
| |
| <span class="kw">let </span>EnabledCompressionEncodings { gzip: accept_gzip } = accept_encodings; |
| <span class="kw">if </span>accept_gzip { |
| this = this.accept_gzip(); |
| } |
| |
| <span class="kw">let </span>EnabledCompressionEncodings { gzip: send_gzip } = send_encodings; |
| <span class="kw">if </span>send_gzip { |
| this = this.send_gzip(); |
| } |
| |
| this |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"compression"</span>))] |
| #[doc(hidden)] |
| #[allow(unused_variables)] |
| </span><span class="kw">pub fn </span>apply_compression_config(<span class="self">self</span>, accept_encodings: (), send_encodings: ()) -> <span class="self">Self </span>{ |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Handle a single unary gRPC request. |
| </span><span class="kw">pub async fn </span>unary<S, B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| <span class="kw-2">mut </span>service: S, |
| req: http::Request<B>, |
| ) -> http::Response<BoxBody> |
| <span class="kw">where |
| </span>S: UnaryService<T::Decode, Response = T::Encode>, |
| B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>accept_encoding = CompressionEncoding::from_accept_encoding_header( |
| req.headers(), |
| <span class="self">self</span>.send_compression_encodings, |
| ); |
| |
| <span class="kw">let </span>request = <span class="kw">match </span><span class="self">self</span>.map_request_unary(req).<span class="kw">await </span>{ |
| <span class="prelude-val">Ok</span>(r) => r, |
| <span class="prelude-val">Err</span>(status) => { |
| <span class="kw">return </span><span class="self">self |
| </span>.map_response::<stream::Once<future::Ready<<span class="prelude-ty">Result</span><T::Encode, Status>>>>( |
| <span class="prelude-val">Err</span>(status), |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>SingleMessageCompressionOverride::default(), |
| ); |
| } |
| }; |
| |
| <span class="kw">let </span>response = service |
| .call(request) |
| .<span class="kw">await |
| </span>.map(|r| r.map(|m| stream::once(future::ok(m)))); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>compression_override = compression_override_from_response(<span class="kw-2">&</span>response); |
| |
| <span class="self">self</span>.map_response( |
| response, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>compression_override, |
| ) |
| } |
| |
| <span class="doccomment">/// Handle a server side streaming request. |
| </span><span class="kw">pub async fn </span>server_streaming<S, B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| <span class="kw-2">mut </span>service: S, |
| req: http::Request<B>, |
| ) -> http::Response<BoxBody> |
| <span class="kw">where |
| </span>S: ServerStreamingService<T::Decode, Response = T::Encode>, |
| S::ResponseStream: Send + <span class="lifetime">'static</span>, |
| B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>accept_encoding = CompressionEncoding::from_accept_encoding_header( |
| req.headers(), |
| <span class="self">self</span>.send_compression_encodings, |
| ); |
| |
| <span class="kw">let </span>request = <span class="kw">match </span><span class="self">self</span>.map_request_unary(req).<span class="kw">await </span>{ |
| <span class="prelude-val">Ok</span>(r) => r, |
| <span class="prelude-val">Err</span>(status) => { |
| <span class="kw">return </span><span class="self">self</span>.map_response::<S::ResponseStream>( |
| <span class="prelude-val">Err</span>(status), |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>SingleMessageCompressionOverride::default(), |
| ); |
| } |
| }; |
| |
| <span class="kw">let </span>response = service.call(request).<span class="kw">await</span>; |
| |
| <span class="self">self</span>.map_response( |
| response, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="comment">// disabling compression of individual stream items must be done on |
| // the items themselves |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>SingleMessageCompressionOverride::default(), |
| ) |
| } |
| |
| <span class="doccomment">/// Handle a client side streaming gRPC request. |
| </span><span class="kw">pub async fn </span>client_streaming<S, B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| <span class="kw-2">mut </span>service: S, |
| req: http::Request<B>, |
| ) -> http::Response<BoxBody> |
| <span class="kw">where |
| </span>S: ClientStreamingService<T::Decode, Response = T::Encode>, |
| B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send + <span class="lifetime">'static</span>, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>accept_encoding = CompressionEncoding::from_accept_encoding_header( |
| req.headers(), |
| <span class="self">self</span>.send_compression_encodings, |
| ); |
| |
| <span class="kw">let </span>request = <span class="macro">t!</span>(<span class="self">self</span>.map_request_streaming(req)); |
| |
| <span class="kw">let </span>response = service |
| .call(request) |
| .<span class="kw">await |
| </span>.map(|r| r.map(|m| stream::once(future::ok(m)))); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>compression_override = compression_override_from_response(<span class="kw-2">&</span>response); |
| |
| <span class="self">self</span>.map_response( |
| response, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>compression_override, |
| ) |
| } |
| |
| <span class="doccomment">/// Handle a bi-directional streaming gRPC request. |
| </span><span class="kw">pub async fn </span>streaming<S, B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| <span class="kw-2">mut </span>service: S, |
| req: http::Request<B>, |
| ) -> http::Response<BoxBody> |
| <span class="kw">where |
| </span>S: StreamingService<T::Decode, Response = T::Encode> + Send, |
| S::ResponseStream: Send + <span class="lifetime">'static</span>, |
| B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>accept_encoding = CompressionEncoding::from_accept_encoding_header( |
| req.headers(), |
| <span class="self">self</span>.send_compression_encodings, |
| ); |
| |
| <span class="kw">let </span>request = <span class="macro">t!</span>(<span class="self">self</span>.map_request_streaming(req)); |
| |
| <span class="kw">let </span>response = service.call(request).<span class="kw">await</span>; |
| |
| <span class="self">self</span>.map_response( |
| response, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>SingleMessageCompressionOverride::default(), |
| ) |
| } |
| |
| <span class="kw">async fn </span>map_request_unary<B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| request: http::Request<B>, |
| ) -> <span class="prelude-ty">Result</span><Request<T::Decode>, Status> |
| <span class="kw">where |
| </span>B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>request_compression_encoding = <span class="self">self</span>.request_encoding_if_supported(<span class="kw-2">&</span>request)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>(parts, body) = request.into_parts(); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>stream = |
| Streaming::new_request(<span class="self">self</span>.codec.decoder(), body, request_compression_encoding); |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"compression"</span>))] |
| </span><span class="kw">let </span>stream = Streaming::new_request(<span class="self">self</span>.codec.decoder(), body); |
| |
| <span class="macro">futures_util::pin_mut!</span>(stream); |
| |
| <span class="kw">let </span>message = stream |
| .try_next() |
| .<span class="kw">await</span><span class="question-mark">? |
| </span>.ok_or_else(|| Status::new(Code::Internal, <span class="string">"Missing request message."</span>))<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>req = Request::from_http_parts(parts, message); |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(trailers) = stream.trailers().<span class="kw">await</span><span class="question-mark">? </span>{ |
| req.metadata_mut().merge(trailers); |
| } |
| |
| <span class="prelude-val">Ok</span>(req) |
| } |
| |
| <span class="kw">fn </span>map_request_streaming<B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| request: http::Request<B>, |
| ) -> <span class="prelude-ty">Result</span><Request<Streaming<T::Decode>>, Status> |
| <span class="kw">where |
| </span>B: Body + Send + <span class="lifetime">'static</span>, |
| B::Error: Into<<span class="kw">crate</span>::Error> + Send, |
| { |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>encoding = <span class="self">self</span>.request_encoding_if_supported(<span class="kw-2">&</span>request)<span class="question-mark">?</span>; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">let </span>request = |
| request.map(|body| Streaming::new_request(<span class="self">self</span>.codec.decoder(), body, encoding)); |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"compression"</span>))] |
| </span><span class="kw">let </span>request = request.map(|body| Streaming::new_request(<span class="self">self</span>.codec.decoder(), body)); |
| |
| <span class="prelude-val">Ok</span>(Request::from_http(request)) |
| } |
| |
| <span class="kw">fn </span>map_response<B>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| response: <span class="prelude-ty">Result</span><<span class="kw">crate</span>::Response<B>, Status>, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] </span>accept_encoding: <span class="prelude-ty">Option</span><CompressionEncoding>, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] </span>compression_override: SingleMessageCompressionOverride, |
| ) -> http::Response<BoxBody> |
| <span class="kw">where |
| </span>B: TryStream<<span class="prelude-val">Ok </span>= T::Encode, Error = Status> + Send + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">let </span>response = <span class="kw">match </span>response { |
| <span class="prelude-val">Ok</span>(r) => r, |
| <span class="prelude-val">Err</span>(status) => <span class="kw">return </span>status.to_http(), |
| }; |
| |
| <span class="kw">let </span>(<span class="kw-2">mut </span>parts, body) = response.into_http().into_parts(); |
| |
| <span class="comment">// Set the content type |
| </span>parts.headers.insert( |
| http::header::CONTENT_TYPE, |
| http::header::HeaderValue::from_static(<span class="string">"application/grpc"</span>), |
| ); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(encoding) = accept_encoding { |
| <span class="comment">// Set the content encoding |
| </span>parts.headers.insert( |
| <span class="kw">crate</span>::codec::compression::ENCODING_HEADER, |
| encoding.into_header_value(), |
| ); |
| } |
| |
| <span class="kw">let </span>body = encode_server( |
| <span class="self">self</span>.codec.encoder(), |
| body.into_stream(), |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>accept_encoding, |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>compression_override, |
| ); |
| |
| http::Response::from_parts(parts, BoxBody::new(body)) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">fn </span>request_encoding_if_supported<B>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| request: <span class="kw-2">&</span>http::Request<B>, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><CompressionEncoding>, Status> { |
| CompressionEncoding::from_encoding_header( |
| request.headers(), |
| <span class="self">self</span>.accept_compression_encodings, |
| ) |
| } |
| } |
| |
| <span class="kw">impl</span><T: fmt::Debug> fmt::Debug <span class="kw">for </span>Grpc<T> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>f = f.debug_struct(<span class="string">"Grpc"</span>); |
| |
| f.field(<span class="string">"codec"</span>, <span class="kw-2">&</span><span class="self">self</span>.codec); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>f.field( |
| <span class="string">"accept_compression_encodings"</span>, |
| <span class="kw-2">&</span><span class="self">self</span>.accept_compression_encodings, |
| ); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span>f.field( |
| <span class="string">"send_compression_encodings"</span>, |
| <span class="kw-2">&</span><span class="self">self</span>.send_compression_encodings, |
| ); |
| |
| f.finish() |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"compression"</span>)] |
| </span><span class="kw">fn </span>compression_override_from_response<B, E>( |
| res: <span class="kw-2">&</span><span class="prelude-ty">Result</span><<span class="kw">crate</span>::Response<B>, E>, |
| ) -> SingleMessageCompressionOverride { |
| res.as_ref() |
| .ok() |
| .and_then(|response| { |
| response |
| .extensions() |
| .get::<SingleMessageCompressionOverride>() |
| .copied() |
| }) |
| .unwrap_or_default() |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tonic" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
