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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::metadata::GRPC_TIMEOUT_HEADER; |
| <span class="kw">use </span><span class="kw">crate</span>::util::{OptionPin, OptionPinProj}; |
| <span class="kw">use </span>http::{HeaderMap, HeaderValue, Request}; |
| <span class="kw">use </span>pin_project::pin_project; |
| <span class="kw">use </span>std::{ |
| fmt, |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| time::Duration, |
| }; |
| <span class="kw">use </span>tokio::time::Sleep; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>GrpcTimeout<S> { |
| inner: S, |
| server_timeout: <span class="prelude-ty">Option</span><Duration>, |
| } |
| |
| <span class="kw">impl</span><S> GrpcTimeout<S> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(inner: S, server_timeout: <span class="prelude-ty">Option</span><Duration>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner, |
| server_timeout, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, ReqBody> Service<Request<ReqBody>> <span class="kw">for </span>GrpcTimeout<S> |
| <span class="kw">where |
| </span>S: Service<Request<ReqBody>>, |
| S::Error: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Response = S::Response; |
| <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: Request<ReqBody>) -> <span class="self">Self</span>::Future { |
| <span class="kw">let </span>client_timeout = try_parse_grpc_timeout(req.headers()).unwrap_or_else(|e| { |
| <span class="macro">tracing::trace!</span>(<span class="string">"Error parsing `grpc-timeout` header {:?}"</span>, e); |
| <span class="prelude-val">None |
| </span>}); |
| |
| <span class="comment">// Use the shorter of the two durations, if either are set |
| </span><span class="kw">let </span>timeout_duration = <span class="kw">match </span>(client_timeout, <span class="self">self</span>.server_timeout) { |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => <span class="prelude-val">None</span>, |
| (<span class="prelude-val">Some</span>(dur), <span class="prelude-val">None</span>) => <span class="prelude-val">Some</span>(dur), |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(dur)) => <span class="prelude-val">Some</span>(dur), |
| (<span class="prelude-val">Some</span>(header), <span class="prelude-val">Some</span>(server)) => { |
| <span class="kw">let </span>shorter_duration = std::cmp::min(header, server); |
| <span class="prelude-val">Some</span>(shorter_duration) |
| } |
| }; |
| |
| ResponseFuture { |
| inner: <span class="self">self</span>.inner.call(req), |
| sleep: timeout_duration |
| .map(tokio::time::sleep) |
| .map(OptionPin::Some) |
| .unwrap_or(OptionPin::None), |
| } |
| } |
| } |
| |
| <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="attribute">#[pin] |
| </span>sleep: OptionPin<Sleep>, |
| } |
| |
| <span class="kw">impl</span><F, Res, E> Future <span class="kw">for </span>ResponseFuture<F> |
| <span class="kw">where |
| </span>F: Future<Output = <span class="prelude-ty">Result</span><Res, E>>, |
| E: Into<<span class="kw">crate</span>::Error>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><Res, <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>this = <span class="self">self</span>.project(); |
| |
| <span class="kw">if let </span>Poll::Ready(result) = this.inner.poll(cx) { |
| <span class="kw">return </span>Poll::Ready(result.map_err(Into::into)); |
| } |
| |
| <span class="kw">if let </span>OptionPinProj::Some(sleep) = this.sleep.project() { |
| <span class="macro">futures_util::ready!</span>(sleep.poll(cx)); |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(TimeoutExpired(()).into())); |
| } |
| |
| Poll::Pending |
| } |
| } |
| |
| <span class="kw">const </span>SECONDS_IN_HOUR: u64 = <span class="number">60 </span>* <span class="number">60</span>; |
| <span class="kw">const </span>SECONDS_IN_MINUTE: u64 = <span class="number">60</span>; |
| |
| <span class="doccomment">/// Tries to parse the `grpc-timeout` header if it is present. If we fail to parse, returns |
| /// the value we attempted to parse. |
| /// |
| /// Follows the [gRPC over HTTP2 spec](https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md). |
| </span><span class="kw">fn </span>try_parse_grpc_timeout( |
| headers: <span class="kw-2">&</span>HeaderMap<HeaderValue>, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Duration>, <span class="kw-2">&</span>HeaderValue> { |
| <span class="kw">match </span>headers.get(GRPC_TIMEOUT_HEADER) { |
| <span class="prelude-val">Some</span>(val) => { |
| <span class="kw">let </span>(timeout_value, timeout_unit) = val |
| .to_str() |
| .map_err(|<span class="kw">_</span>| val) |
| .and_then(|s| <span class="kw">if </span>s.is_empty() { <span class="prelude-val">Err</span>(val) } <span class="kw">else </span>{ <span class="prelude-val">Ok</span>(s) })<span class="question-mark">? |
| </span><span class="comment">// `HeaderValue::to_str` only returns `Ok` if the header contains ASCII so this |
| // `split_at` will never panic from trying to split in the middle of a character. |
| // See https://docs.rs/http/0.2.4/http/header/struct.HeaderValue.html#method.to_str |
| // |
| // `len - 1` also wont panic since we just checked `s.is_empty`. |
| </span>.split_at(val.len() - <span class="number">1</span>); |
| |
| <span class="comment">// gRPC spec specifies `TimeoutValue` will be at most 8 digits |
| // Caping this at 8 digits also prevents integer overflow from ever occurring |
| </span><span class="kw">if </span>timeout_value.len() > <span class="number">8 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(val); |
| } |
| |
| <span class="kw">let </span>timeout_value: u64 = timeout_value.parse().map_err(|<span class="kw">_</span>| val)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>duration = <span class="kw">match </span>timeout_unit { |
| <span class="comment">// Hours |
| </span><span class="string">"H" </span>=> Duration::from_secs(timeout_value * SECONDS_IN_HOUR), |
| <span class="comment">// Minutes |
| </span><span class="string">"M" </span>=> Duration::from_secs(timeout_value * SECONDS_IN_MINUTE), |
| <span class="comment">// Seconds |
| </span><span class="string">"S" </span>=> Duration::from_secs(timeout_value), |
| <span class="comment">// Milliseconds |
| </span><span class="string">"m" </span>=> Duration::from_millis(timeout_value), |
| <span class="comment">// Microseconds |
| </span><span class="string">"u" </span>=> Duration::from_micros(timeout_value), |
| <span class="comment">// Nanoseconds |
| </span><span class="string">"n" </span>=> Duration::from_nanos(timeout_value), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(val), |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(duration)) |
| } |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Error returned if a request didn't complete within the configured timeout. |
| /// |
| /// Timeouts can be configured either with [`Endpoint::timeout`], [`Server::timeout`], or by |
| /// setting the [`grpc-timeout` metadata value][spec]. |
| /// |
| /// [`Endpoint::timeout`]: crate::transport::server::Server::timeout |
| /// [`Server::timeout`]: crate::transport::channel::Endpoint::timeout |
| /// [spec]: https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>TimeoutExpired(()); |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>TimeoutExpired { |
| <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="macro">write!</span>(f, <span class="string">"Timeout expired"</span>) |
| } |
| } |
| |
| <span class="comment">// std::error::Error only requires a type to impl Debug and Display |
| </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>TimeoutExpired {} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>quickcheck::{Arbitrary, Gen}; |
| <span class="kw">use </span>quickcheck_macros::quickcheck; |
| |
| <span class="comment">// Helper function to reduce the boiler plate of our test cases |
| </span><span class="kw">fn </span>setup_map_try_parse(val: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Duration>, HeaderValue> { |
| <span class="kw">let </span><span class="kw-2">mut </span>hm = HeaderMap::new(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = val { |
| <span class="kw">let </span>hv = HeaderValue::from_str(v).unwrap(); |
| hm.insert(GRPC_TIMEOUT_HEADER, hv); |
| }; |
| |
| try_parse_grpc_timeout(<span class="kw-2">&</span>hm).map_err(|e| e.clone()) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_hours() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"3H"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_secs(<span class="number">3 </span>* <span class="number">60 </span>* <span class="number">60</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_minutes() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"1M"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_secs(<span class="number">60</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_seconds() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"42S"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_secs(<span class="number">42</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_milliseconds() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"13m"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_millis(<span class="number">13</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_microseconds() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"2u"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_micros(<span class="number">2</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_nanoseconds() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"82n"</span>)).unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(Duration::from_nanos(<span class="number">82</span>), parsed_duration); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_header_not_present() { |
| <span class="kw">let </span>parsed_duration = setup_map_try_parse(<span class="prelude-val">None</span>).unwrap(); |
| <span class="macro">assert!</span>(parsed_duration.is_none()); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"82f"</span>)] |
| </span><span class="kw">fn </span>test_invalid_unit() { |
| <span class="comment">// "f" is not a valid TimeoutUnit |
| </span>setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"82f"</span>)).unwrap().unwrap(); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"123456789H"</span>)] |
| </span><span class="kw">fn </span>test_too_many_digits() { |
| <span class="comment">// gRPC spec states TimeoutValue will be at most 8 digits |
| </span>setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"123456789H"</span>)).unwrap().unwrap(); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic(expected = <span class="string">"oneH"</span>)] |
| </span><span class="kw">fn </span>test_invalid_digits() { |
| <span class="comment">// gRPC spec states TimeoutValue will be at most 8 digits |
| </span>setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="string">"oneH"</span>)).unwrap().unwrap(); |
| } |
| |
| <span class="attribute">#[quickcheck] |
| </span><span class="kw">fn </span>fuzz(header_value: HeaderValueGen) -> bool { |
| <span class="kw">let </span>header_value = header_value.<span class="number">0</span>; |
| |
| <span class="comment">// this just shouldn't panic |
| </span><span class="kw">let _ </span>= setup_map_try_parse(<span class="prelude-val">Some</span>(<span class="kw-2">&</span>header_value)); |
| |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="doccomment">/// Newtype to implement `Arbitrary` for generating `String`s that are valid `HeaderValue`s. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">struct </span>HeaderValueGen(String); |
| |
| <span class="kw">impl </span>Arbitrary <span class="kw">for </span>HeaderValueGen { |
| <span class="kw">fn </span>arbitrary(g: <span class="kw-2">&mut </span>Gen) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>max = g.choose(<span class="kw-2">&</span>(<span class="number">1</span>..<span class="number">70</span>).collect::<Vec<<span class="kw">_</span>>>()).copied().unwrap(); |
| <span class="self">Self</span>(gen_string(g, <span class="number">0</span>, max)) |
| } |
| } |
| |
| <span class="comment">// copied from https://github.com/hyperium/http/blob/master/tests/header_map_fuzz.rs |
| </span><span class="kw">fn </span>gen_string(g: <span class="kw-2">&mut </span>Gen, min: usize, max: usize) -> String { |
| <span class="kw">let </span>bytes: Vec<<span class="kw">_</span>> = (min..max) |
| .map(|<span class="kw">_</span>| { |
| <span class="comment">// Chars to pick from |
| </span>g.choose(<span class="string">b"ABCDEFGHIJKLMNOPQRSTUVabcdefghilpqrstuvwxyz----"</span>) |
| .copied() |
| .unwrap() |
| }) |
| .collect(); |
| |
| String::from_utf8(bytes).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> |