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| </pre><pre class="rust"><code><span class="doccomment">//! gRPC interceptors which are a kind of middleware. |
| //! |
| //! See [`Interceptor`] for more details. |
| |
| </span><span class="kw">use crate</span>::{request::SanitizeHeaders, Status}; |
| <span class="kw">use </span>pin_project::pin_project; |
| <span class="kw">use </span>std::{ |
| fmt, |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower_layer::Layer; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="doccomment">/// A gRPC interceptor. |
| /// |
| /// gRPC interceptors are similar to middleware but have less flexibility. An interceptor allows |
| /// you to do two main things, one is to add/remove/check items in the `MetadataMap` of each |
| /// request. Two, cancel a request with a `Status`. |
| /// |
| /// Any function that satisfies the bound `FnMut(Request<()>) -> Result<Request<()>, Status>` can be |
| /// used as an `Interceptor`. |
| /// |
| /// An interceptor can be used on both the server and client side through the `tonic-build` crate's |
| /// generated structs. |
| /// |
| /// See the [interceptor example][example] for more details. |
| /// |
| /// If you need more powerful middleware, [tower] is the recommended approach. You can find |
| /// examples of how to use tower with tonic [here][tower-example]. |
| /// |
| /// Additionally, interceptors is not the recommended way to add logging to your service. For that |
| /// a [tower] middleware is more appropriate since it can also act on the response. For example |
| /// tower-http's [`Trace`](https://docs.rs/tower-http/latest/tower_http/trace/index.html) |
| /// middleware supports gRPC out of the box. |
| /// |
| /// [tower]: https://crates.io/crates/tower |
| /// [example]: https://github.com/hyperium/tonic/tree/master/examples/src/interceptor |
| /// [tower-example]: https://github.com/hyperium/tonic/tree/master/examples/src/tower |
| </span><span class="kw">pub trait </span>Interceptor { |
| <span class="doccomment">/// Intercept a request before it is sent, optionally cancelling it. |
| </span><span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, request: <span class="kw">crate</span>::Request<()>) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::Request<()>, Status>; |
| } |
| |
| <span class="kw">impl</span><F> Interceptor <span class="kw">for </span>F |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw">crate</span>::Request<()>) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::Request<()>, Status>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, request: <span class="kw">crate</span>::Request<()>) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::Request<()>, Status> { |
| <span class="self">self</span>(request) |
| } |
| } |
| |
| <span class="doccomment">/// Create a new interceptor layer. |
| /// |
| /// See [`Interceptor`] for more details. |
| </span><span class="kw">pub fn </span>interceptor<F>(f: F) -> InterceptorLayer<F> |
| <span class="kw">where |
| </span>F: Interceptor, |
| { |
| InterceptorLayer { f } |
| } |
| |
| <span class="attribute">#[deprecated( |
| since = <span class="string">"0.5.1"</span>, |
| note = <span class="string">"Please use the `interceptor` function instead" |
| </span>)] |
| </span><span class="doccomment">/// Create a new interceptor layer. |
| /// |
| /// See [`Interceptor`] for more details. |
| </span><span class="kw">pub fn </span>interceptor_fn<F>(f: F) -> InterceptorLayer<F> |
| <span class="kw">where |
| </span>F: Interceptor, |
| { |
| interceptor(f) |
| } |
| |
| <span class="doccomment">/// A gRPC interceptor that can be used as a [`Layer`], |
| /// created by calling [`interceptor`]. |
| /// |
| /// See [`Interceptor`] for more details. |
| </span><span class="attribute">#[derive(Debug, Clone, Copy)] |
| </span><span class="kw">pub struct </span>InterceptorLayer<F> { |
| f: F, |
| } |
| |
| <span class="kw">impl</span><S, F> Layer<S> <span class="kw">for </span>InterceptorLayer<F> |
| <span class="kw">where |
| </span>F: Interceptor + Clone, |
| { |
| <span class="kw">type </span>Service = InterceptedService<S, F>; |
| |
| <span class="kw">fn </span>layer(<span class="kw-2">&</span><span class="self">self</span>, service: S) -> <span class="self">Self</span>::Service { |
| InterceptedService::new(service, <span class="self">self</span>.f.clone()) |
| } |
| } |
| |
| <span class="attribute">#[deprecated( |
| since = <span class="string">"0.5.1"</span>, |
| note = <span class="string">"Please use the `InterceptorLayer` type instead" |
| </span>)] |
| </span><span class="doccomment">/// A gRPC interceptor that can be used as a [`Layer`], |
| /// created by calling [`interceptor`]. |
| /// |
| /// See [`Interceptor`] for more details. |
| </span><span class="kw">pub type </span>InterceptorFn<F> = InterceptorLayer<F>; |
| |
| <span class="doccomment">/// A service wrapped in an interceptor middleware. |
| /// |
| /// See [`Interceptor`] for more details. |
| </span><span class="attribute">#[derive(Clone, Copy)] |
| </span><span class="kw">pub struct </span>InterceptedService<S, F> { |
| inner: S, |
| f: F, |
| } |
| |
| <span class="kw">impl</span><S, F> InterceptedService<S, F> { |
| <span class="doccomment">/// Create a new `InterceptedService` that wraps `S` and intercepts each request with the |
| /// function `F`. |
| </span><span class="kw">pub fn </span>new(service: S, f: F) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>F: Interceptor, |
| { |
| <span class="self">Self </span>{ inner: service, f } |
| } |
| } |
| |
| <span class="kw">impl</span><S, F> fmt::Debug <span class="kw">for </span>InterceptedService<S, F> |
| <span class="kw">where |
| </span>S: fmt::Debug, |
| { |
| <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 { |
| f.debug_struct(<span class="string">"InterceptedService"</span>) |
| .field(<span class="string">"inner"</span>, <span class="kw-2">&</span><span class="self">self</span>.inner) |
| .field(<span class="string">"f"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, std::any::type_name::<F>())) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><S, F, ReqBody, ResBody> Service<http::Request<ReqBody>> <span class="kw">for </span>InterceptedService<S, F> |
| <span class="kw">where |
| </span>F: Interceptor, |
| S: Service<http::Request<ReqBody>, Response = http::Response<ResBody>>, |
| S::Error: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Response = http::Response<ResBody>; |
| <span class="kw">type </span>Error = <span class="kw">crate</span>::Error; |
| <span class="kw">type </span>Future = ResponseFuture<S::Future>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>poll_ready(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="self">self</span>.inner.poll_ready(cx).map_err(Into::into) |
| } |
| |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, req: http::Request<ReqBody>) -> <span class="self">Self</span>::Future { |
| <span class="kw">let </span>uri = req.uri().clone(); |
| <span class="kw">let </span>req = <span class="kw">crate</span>::Request::from_http(req); |
| <span class="kw">let </span>(metadata, extensions, msg) = req.into_parts(); |
| |
| <span class="kw">match </span><span class="self">self |
| </span>.f |
| .call(<span class="kw">crate</span>::Request::from_parts(metadata, extensions, ())) |
| { |
| <span class="prelude-val">Ok</span>(req) => { |
| <span class="kw">let </span>(metadata, extensions, <span class="kw">_</span>) = req.into_parts(); |
| <span class="kw">let </span>req = <span class="kw">crate</span>::Request::from_parts(metadata, extensions, msg); |
| <span class="kw">let </span>req = req.into_http(uri, SanitizeHeaders::No); |
| ResponseFuture::future(<span class="self">self</span>.inner.call(req)) |
| } |
| <span class="prelude-val">Err</span>(status) => ResponseFuture::error(status), |
| } |
| } |
| } |
| |
| <span class="comment">// required to use `InterceptedService` with `Router` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"transport"</span>)] |
| </span><span class="kw">impl</span><S, F> <span class="kw">crate</span>::transport::NamedService <span class="kw">for </span>InterceptedService<S, F> |
| <span class="kw">where |
| </span>S: <span class="kw">crate</span>::transport::NamedService, |
| { |
| <span class="kw">const </span>NAME: <span class="kw-2">&</span><span class="lifetime">'static </span>str = S::NAME; |
| } |
| |
| <span class="doccomment">/// Response future for [`InterceptedService`]. |
| </span><span class="attribute">#[pin_project] |
| #[derive(Debug)] |
| </span><span class="kw">pub struct </span>ResponseFuture<F> { |
| <span class="attribute">#[pin] |
| </span>kind: Kind<F>, |
| } |
| |
| <span class="kw">impl</span><F> ResponseFuture<F> { |
| <span class="kw">fn </span>future(future: F) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| kind: Kind::Future(future), |
| } |
| } |
| |
| <span class="kw">fn </span>error(status: Status) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| kind: Kind::Error(<span class="prelude-val">Some</span>(status)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[pin_project(project = KindProj)] |
| #[derive(Debug)] |
| </span><span class="kw">enum </span>Kind<F> { |
| Future(<span class="attribute">#[pin] </span>F), |
| Error(<span class="prelude-ty">Option</span><Status>), |
| } |
| |
| <span class="kw">impl</span><F, E, B> Future <span class="kw">for </span>ResponseFuture<F> |
| <span class="kw">where |
| </span>F: Future<Output = <span class="prelude-ty">Result</span><http::Response<B>, E>>, |
| E: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><http::Response<B>, <span class="kw">crate</span>::Error>; |
| |
| <span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> { |
| <span class="kw">match </span><span class="self">self</span>.project().kind.project() { |
| KindProj::Future(future) => future.poll(cx).map_err(Into::into), |
| KindProj::Error(status) => { |
| <span class="kw">let </span>error = status.take().unwrap().into(); |
| Poll::Ready(<span class="prelude-val">Err</span>(error)) |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="attribute">#[allow(unused_imports)] |
| </span><span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>tower::ServiceExt; |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>doesnt_remove_headers() { |
| <span class="kw">let </span>svc = tower::service_fn(|request: http::Request<hyper::Body>| <span class="kw">async move </span>{ |
| <span class="macro">assert_eq!</span>( |
| request |
| .headers() |
| .get(<span class="string">"user-agent"</span>) |
| .expect(<span class="string">"missing in leaf service"</span>), |
| <span class="string">"test-tonic" |
| </span>); |
| |
| <span class="prelude-val">Ok</span>::<<span class="kw">_</span>, hyper::Error>(hyper::Response::new(hyper::Body::empty())) |
| }); |
| |
| <span class="kw">let </span>svc = InterceptedService::new(svc, |request: <span class="kw">crate</span>::Request<()>| { |
| <span class="macro">assert_eq!</span>( |
| request |
| .metadata() |
| .get(<span class="string">"user-agent"</span>) |
| .expect(<span class="string">"missing in interceptor"</span>), |
| <span class="string">"test-tonic" |
| </span>); |
| <span class="prelude-val">Ok</span>(request) |
| }); |
| |
| <span class="kw">let </span>request = http::Request::builder() |
| .header(<span class="string">"user-agent"</span>, <span class="string">"test-tonic"</span>) |
| .body(hyper::Body::empty()) |
| .unwrap(); |
| |
| svc.oneshot(request).<span class="kw">await</span>.unwrap(); |
| } |
| } |
| </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> |
