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| </pre><pre class="rust"><code><span class="kw">use crate</span>::{ |
| util::{OptionPin, OptionPinProj}, |
| Status, |
| }; |
| <span class="kw">use </span>futures_util::ready; |
| <span class="kw">use </span>http::Response; |
| <span class="kw">use </span>pin_project::pin_project; |
| <span class="kw">use </span>std::{ |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower::Service; |
| |
| <span class="doccomment">/// Middleware that attempts to recover from service errors by turning them into a response built |
| /// from the `Status`. |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>RecoverError<S> { |
| inner: S, |
| } |
| |
| <span class="kw">impl</span><S> RecoverError<S> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(inner: S) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ inner } |
| } |
| } |
| |
| <span class="kw">impl</span><S, R, ResBody> Service<R> <span class="kw">for </span>RecoverError<S> |
| <span class="kw">where |
| </span>S: Service<R, Response = Response<ResBody>>, |
| S::Error: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Response = Response<MaybeEmptyBody<ResBody>>; |
| <span class="kw">type </span>Error = <span class="kw">crate</span>::Error; |
| <span class="kw">type </span>Future = ResponseFuture<S::Future>; |
| |
| <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: R) -> <span class="self">Self</span>::Future { |
| ResponseFuture { |
| inner: <span class="self">self</span>.inner.call(req), |
| } |
| } |
| } |
| |
| <span class="attribute">#[pin_project] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>ResponseFuture<F> { |
| <span class="attribute">#[pin] |
| </span>inner: F, |
| } |
| |
| <span class="kw">impl</span><F, E, ResBody> Future <span class="kw">for </span>ResponseFuture<F> |
| <span class="kw">where |
| </span>F: Future<Output = <span class="prelude-ty">Result</span><Response<ResBody>, E>>, |
| E: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><Response<MaybeEmptyBody<ResBody>>, <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">let </span>result: <span class="prelude-ty">Result</span><Response<<span class="kw">_</span>>, <span class="kw">crate</span>::Error> = |
| <span class="macro">ready!</span>(<span class="self">self</span>.project().inner.poll(cx)).map_err(Into::into); |
| |
| <span class="kw">match </span>result { |
| <span class="prelude-val">Ok</span>(response) => { |
| <span class="kw">let </span>response = response.map(MaybeEmptyBody::full); |
| Poll::Ready(<span class="prelude-val">Ok</span>(response)) |
| } |
| <span class="prelude-val">Err</span>(err) => <span class="kw">match </span>Status::try_from_error(err) { |
| <span class="prelude-val">Ok</span>(status) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Response::new(MaybeEmptyBody::empty()); |
| status.add_header(res.headers_mut()).unwrap(); |
| Poll::Ready(<span class="prelude-val">Ok</span>(res)) |
| } |
| <span class="prelude-val">Err</span>(err) => Poll::Ready(<span class="prelude-val">Err</span>(err)), |
| }, |
| } |
| } |
| } |
| |
| <span class="attribute">#[pin_project] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>MaybeEmptyBody<B> { |
| <span class="attribute">#[pin] |
| </span>inner: OptionPin<B>, |
| } |
| |
| <span class="kw">impl</span><B> MaybeEmptyBody<B> { |
| <span class="kw">fn </span>full(inner: B) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner: OptionPin::Some(inner), |
| } |
| } |
| |
| <span class="kw">fn </span>empty() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner: OptionPin::None, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><B> http_body::Body <span class="kw">for </span>MaybeEmptyBody<B> |
| <span class="kw">where |
| </span>B: http_body::Body + Send, |
| { |
| <span class="kw">type </span>Data = B::Data; |
| <span class="kw">type </span>Error = B::Error; |
| |
| <span class="kw">fn </span>poll_data( |
| <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="prelude-ty">Option</span><<span class="prelude-ty">Result</span><<span class="self">Self</span>::Data, <span class="self">Self</span>::Error>>> { |
| <span class="kw">match </span><span class="self">self</span>.project().inner.project() { |
| OptionPinProj::Some(b) => b.poll_data(cx), |
| OptionPinProj::None => Poll::Ready(<span class="prelude-val">None</span>), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_trailers( |
| <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="prelude-ty">Result</span><<span class="prelude-ty">Option</span><http::HeaderMap>, <span class="self">Self</span>::Error>> { |
| <span class="kw">match </span><span class="self">self</span>.project().inner.project() { |
| OptionPinProj::Some(b) => b.poll_trailers(cx), |
| OptionPinProj::None => Poll::Ready(<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)), |
| } |
| } |
| |
| <span class="kw">fn </span>is_end_stream(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.inner { |
| OptionPin::Some(b) => b.is_end_stream(), |
| OptionPin::None => <span class="bool-val">true</span>, |
| } |
| } |
| } |
| </code></pre></div> |
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