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 </pre><pre class="rust"><code><span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::codec::compression::{CompressionEncoding, EnabledCompressionEncodings};
 <span class="kw">use crate</span>::{
     body::BoxBody,
     client::GrpcService,
     codec::{encode_client, Codec, Streaming},
     request::SanitizeHeaders,
     Code, Request, Response, Status,
 };
 <span class="kw">use </span>futures_core::Stream;
 <span class="kw">use </span>futures_util::{future, stream, TryStreamExt};
 <span class="kw">use </span>http::{
     header::{HeaderValue, CONTENT_TYPE, TE},
     uri::{Parts, PathAndQuery, Uri},
 };
 <span class="kw">use </span>http_body::Body;
 <span class="kw">use </span>std::fmt;

 <span class="doccomment">/// A gRPC client dispatcher.
 ///
 /// This will wrap some inner [`GrpcService`] and will encode/decode
 /// messages via the provided codec.
 ///
 /// Each request method takes a [`Request`], a [`PathAndQuery`], and a
 /// [`Codec`]. The request contains the message to send via the
 /// [`Codec::encoder`]. The path determines the fully qualified path
 /// that will be append to the outgoing uri. The path must follow
 /// the conventions explained in the [gRPC protocol definition] under `Path →`. An
 /// example of this path could look like `/greeter.Greeter/SayHello`.
 ///
 /// [gRPC protocol definition]: https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests
 </span><span class="kw">pub struct </span>Grpc&lt;T&gt; {
     inner: T,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
     </span><span class="doccomment">/// Which compression encodings does the client accept?
     </span>accept_compression_encodings: EnabledCompressionEncodings,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
     </span><span class="doccomment">/// The compression encoding that will be applied to requests.
     </span>send_compression_encodings: <span class="prelude-ty">Option</span>&lt;CompressionEncoding&gt;,
 }

 <span class="kw">impl</span>&lt;T&gt; Grpc&lt;T&gt; {
     <span class="doccomment">/// Creates a new gRPC client with the provided [`GrpcService`].
     </span><span class="kw">pub fn </span>new(inner: T) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             inner,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
             </span>send_compression_encodings: <span class="prelude-val">None</span>,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
             </span>accept_compression_encodings: EnabledCompressionEncodings::default(),
         }
     }

     <span class="doccomment">/// Compress requests with `gzip`.
     ///
     /// Requires the server to accept `gzip` otherwise it might return an error.
     ///
     /// # Example
     ///
     /// The most common way of using this is through a client generated by tonic-build:
     ///
     /// ```rust
     /// use tonic::transport::Channel;
     /// # struct TestClient&lt;T&gt;(T);
     /// # impl&lt;T&gt; TestClient&lt;T&gt; {
     /// #     fn new(channel: T) -&gt; Self { Self(channel) }
     /// #     fn send_gzip(self) -&gt; Self { self }
     /// # }
     ///
     /// # async {
     /// let channel = Channel::builder(&quot;127.0.0.1:3000&quot;.parse().unwrap())
     ///     .connect()
     ///     .await
     ///     .unwrap();
     ///
     /// let client = TestClient::new(channel).send_gzip();
     /// # };
     /// ```
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;compression&quot;</span>)))]
     </span><span class="kw">pub fn </span>send_gzip(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">self</span>.send_compression_encodings = <span class="prelude-val">Some</span>(CompressionEncoding::Gzip);
         <span class="self">self
     </span>}

     <span class="attribute">#[doc(hidden)]
     #[cfg(not(feature = <span class="string">&quot;compression&quot;</span>))]
     </span><span class="kw">pub fn </span>send_gzip(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="macro">panic!</span>(
             <span class="string">&quot;`send_gzip` called on a client but the `compression` feature is not enabled on tonic&quot;
         </span>);
     }

     <span class="doccomment">/// Enable accepting `gzip` compressed responses.
     ///
     /// Requires the server to also support sending compressed responses.
     ///
     /// # Example
     ///
     /// The most common way of using this is through a client generated by tonic-build:
     ///
     /// ```rust
     /// use tonic::transport::Channel;
     /// # struct TestClient&lt;T&gt;(T);
     /// # impl&lt;T&gt; TestClient&lt;T&gt; {
     /// #     fn new(channel: T) -&gt; Self { Self(channel) }
     /// #     fn accept_gzip(self) -&gt; Self { self }
     /// # }
     ///
     /// # async {
     /// let channel = Channel::builder(&quot;127.0.0.1:3000&quot;.parse().unwrap())
     ///     .connect()
     ///     .await
     ///     .unwrap();
     ///
     /// let client = TestClient::new(channel).accept_gzip();
     /// # };
     /// ```
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;compression&quot;</span>)))]
     </span><span class="kw">pub fn </span>accept_gzip(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; <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">&quot;compression&quot;</span>))]
     </span><span class="kw">pub fn </span>accept_gzip(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="macro">panic!</span>(<span class="string">&quot;`accept_gzip` called on a client but the `compression` feature is not enabled on tonic&quot;</span>);
     }

     <span class="doccomment">/// Check if the inner [`GrpcService`] is able to accept a  new request.
     ///
     /// This will call [`GrpcService::poll_ready`] until it returns ready or
     /// an error. If this returns ready the inner [`GrpcService`] is ready to
     /// accept one more request.
     </span><span class="kw">pub async fn </span>ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), T::Error&gt;
     <span class="kw">where
         </span>T: GrpcService&lt;BoxBody&gt;,
     {
         future::poll_fn(|cx| <span class="self">self</span>.inner.poll_ready(cx)).<span class="kw">await
     </span>}

     <span class="doccomment">/// Send a single unary gRPC request.
     </span><span class="kw">pub async fn </span>unary&lt;M1, M2, C&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;M1&gt;,
         path: PathAndQuery,
         codec: C,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Response&lt;M2&gt;, Status&gt;
     <span class="kw">where
         </span>T: GrpcService&lt;BoxBody&gt;,
         T::ResponseBody: Body + Send + <span class="lifetime">&#39;static</span>,
         &lt;T::ResponseBody <span class="kw">as </span>Body&gt;::Error: Into&lt;<span class="kw">crate</span>::Error&gt;,
         C: Codec&lt;Encode = M1, Decode = M2&gt;,
         M1: Send + Sync + <span class="lifetime">&#39;static</span>,
         M2: Send + Sync + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>request = request.map(|m| stream::once(future::ready(m)));
         <span class="self">self</span>.client_streaming(request, path, codec).<span class="kw">await
     </span>}

     <span class="doccomment">/// Send a client side streaming gRPC request.
     </span><span class="kw">pub async fn </span>client_streaming&lt;S, M1, M2, C&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;S&gt;,
         path: PathAndQuery,
         codec: C,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Response&lt;M2&gt;, Status&gt;
     <span class="kw">where
         </span>T: GrpcService&lt;BoxBody&gt;,
         T::ResponseBody: Body + Send + <span class="lifetime">&#39;static</span>,
         &lt;T::ResponseBody <span class="kw">as </span>Body&gt;::Error: Into&lt;<span class="kw">crate</span>::Error&gt;,
         S: Stream&lt;Item = M1&gt; + Send + <span class="lifetime">&#39;static</span>,
         C: Codec&lt;Encode = M1, Decode = M2&gt;,
         M1: Send + Sync + <span class="lifetime">&#39;static</span>,
         M2: Send + Sync + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>(<span class="kw-2">mut </span>parts, body, extensions) =
             <span class="self">self</span>.streaming(request, path, codec).<span class="kw">await</span><span class="question-mark">?</span>.into_parts();

         <span class="macro">futures_util::pin_mut!</span>(body);

         <span class="kw">let </span>message = body
             .try_next()
             .<span class="kw">await
             </span>.map_err(|<span class="kw-2">mut </span>status| {
                 status.metadata_mut().merge(parts.clone());
                 status
             })<span class="question-mark">?
             </span>.ok_or_else(|| Status::new(Code::Internal, <span class="string">&quot;Missing response message.&quot;</span>))<span class="question-mark">?</span>;

         <span class="kw">if let </span><span class="prelude-val">Some</span>(trailers) = body.trailers().<span class="kw">await</span><span class="question-mark">? </span>{
             parts.merge(trailers);
         }

         <span class="prelude-val">Ok</span>(Response::from_parts(parts, message, extensions))
     }

     <span class="doccomment">/// Send a server side streaming gRPC request.
     </span><span class="kw">pub async fn </span>server_streaming&lt;M1, M2, C&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;M1&gt;,
         path: PathAndQuery,
         codec: C,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Response&lt;Streaming&lt;M2&gt;&gt;, Status&gt;
     <span class="kw">where
         </span>T: GrpcService&lt;BoxBody&gt;,
         T::ResponseBody: Body + Send + <span class="lifetime">&#39;static</span>,
         &lt;T::ResponseBody <span class="kw">as </span>Body&gt;::Error: Into&lt;<span class="kw">crate</span>::Error&gt;,
         C: Codec&lt;Encode = M1, Decode = M2&gt;,
         M1: Send + Sync + <span class="lifetime">&#39;static</span>,
         M2: Send + Sync + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>request = request.map(|m| stream::once(future::ready(m)));
         <span class="self">self</span>.streaming(request, path, codec).<span class="kw">await
     </span>}

     <span class="doccomment">/// Send a bi-directional streaming gRPC request.
     </span><span class="kw">pub async fn </span>streaming&lt;S, M1, M2, C&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;S&gt;,
         path: PathAndQuery,
         <span class="kw-2">mut </span>codec: C,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Response&lt;Streaming&lt;M2&gt;&gt;, Status&gt;
     <span class="kw">where
         </span>T: GrpcService&lt;BoxBody&gt;,
         T::ResponseBody: Body + Send + <span class="lifetime">&#39;static</span>,
         &lt;T::ResponseBody <span class="kw">as </span>Body&gt;::Error: Into&lt;<span class="kw">crate</span>::Error&gt;,
         S: Stream&lt;Item = M1&gt; + Send + <span class="lifetime">&#39;static</span>,
         C: Codec&lt;Encode = M1, Decode = M2&gt;,
         M1: Send + Sync + <span class="lifetime">&#39;static</span>,
         M2: Send + Sync + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span><span class="kw-2">mut </span>parts = Parts::default();
         parts.path_and_query = <span class="prelude-val">Some</span>(path);

         <span class="kw">let </span>uri = Uri::from_parts(parts).expect(<span class="string">&quot;path_and_query only is valid Uri&quot;</span>);

         <span class="kw">let </span>request = request
             .map(|s| {
                 encode_client(
                     codec.encoder(),
                     s,
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
                     </span><span class="self">self</span>.send_compression_encodings,
                 )
             })
             .map(BoxBody::new);

         <span class="kw">let </span><span class="kw-2">mut </span>request = request.into_http(uri, SanitizeHeaders::Yes);

         <span class="comment">// Add the gRPC related HTTP headers
         </span>request
             .headers_mut()
             .insert(TE, HeaderValue::from_static(<span class="string">&quot;trailers&quot;</span>));

         <span class="comment">// Set the content type
         </span>request
             .headers_mut()
             .insert(CONTENT_TYPE, HeaderValue::from_static(<span class="string">&quot;application/grpc&quot;</span>));

         <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
         </span>{
             <span class="kw">if let </span><span class="prelude-val">Some</span>(encoding) = <span class="self">self</span>.send_compression_encodings {
                 request.headers_mut().insert(
                     <span class="kw">crate</span>::codec::compression::ENCODING_HEADER,
                     encoding.into_header_value(),
                 );
             }

             <span class="kw">if let </span><span class="prelude-val">Some</span>(header_value) = <span class="self">self
                 </span>.accept_compression_encodings
                 .into_accept_encoding_header_value()
             {
                 request.headers_mut().insert(
                     <span class="kw">crate</span>::codec::compression::ACCEPT_ENCODING_HEADER,
                     header_value,
                 );
             }
         }

         <span class="kw">let </span>response = <span class="self">self
             </span>.inner
             .call(request)
             .<span class="kw">await
             </span>.map_err(|err| Status::from_error(err.into()))<span class="question-mark">?</span>;

         <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
         </span><span class="kw">let </span>encoding = CompressionEncoding::from_encoding_header(
             response.headers(),
             <span class="self">self</span>.accept_compression_encodings,
         )<span class="question-mark">?</span>;

         <span class="kw">let </span>status_code = response.status();
         <span class="kw">let </span>trailers_only_status = Status::from_header_map(response.headers());

         <span class="comment">// We do not need to check for trailers if the `grpc-status` header is present
         // with a valid code.
         </span><span class="kw">let </span>expect_additional_trailers = <span class="kw">if let </span><span class="prelude-val">Some</span>(status) = trailers_only_status {
             <span class="kw">if </span>status.code() != Code::Ok {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(status);
             }

             <span class="bool-val">false
         </span>} <span class="kw">else </span>{
             <span class="bool-val">true
         </span>};

         <span class="kw">let </span>response = response.map(|body| {
             <span class="kw">if </span>expect_additional_trailers {
                 Streaming::new_response(
                     codec.decoder(),
                     body,
                     status_code,
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
                     </span>encoding,
                 )
             } <span class="kw">else </span>{
                 Streaming::new_empty(codec.decoder(), body)
             }
         });

         <span class="prelude-val">Ok</span>(Response::from_http(response))
     }
 }

 <span class="kw">impl</span>&lt;T: Clone&gt; Clone <span class="kw">for </span>Grpc&lt;T&gt; {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             inner: <span class="self">self</span>.inner.clone(),
             <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
             </span>send_compression_encodings: <span class="self">self</span>.send_compression_encodings,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
             </span>accept_compression_encodings: <span class="self">self</span>.accept_compression_encodings,
         }
     }
 }

 <span class="kw">impl</span>&lt;T: fmt::Debug&gt; fmt::Debug <span class="kw">for </span>Grpc&lt;T&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>f = f.debug_struct(<span class="string">&quot;Grpc&quot;</span>);

         f.field(<span class="string">&quot;inner&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.inner);

         <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
         </span>f.field(<span class="string">&quot;compression_encoding&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.send_compression_encodings);

         <span class="attribute">#[cfg(feature = <span class="string">&quot;compression&quot;</span>)]
         </span>f.field(
             <span class="string">&quot;accept_compression_encodings&quot;</span>,
             <span class="kw-2">&amp;</span><span class="self">self</span>.accept_compression_encodings,
         );

         f.finish()
     }
 }
 </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>