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| </pre><pre class="rust"><code><span class="doccomment">//! Futures compatibility for [`tracing`]. |
| //! |
| //! # Overview |
| //! |
| //! [`tracing`] is a framework for instrumenting Rust programs to collect |
| //! structured, event-based diagnostic information. This crate provides utilities |
| //! for using `tracing` to instrument asynchronous code written using futures and |
| //! async/await. |
| //! |
| //! The crate provides the following traits: |
| //! |
| //! * [`Instrument`] allows a `tracing` [span] to be attached to a future, sink, |
| //! stream, or executor. |
| //! |
| //! * [`WithSubscriber`] allows a `tracing` [`Subscriber`] to be attached to a |
| //! future, sink, stream, or executor. |
| //! |
| //! *Compiler support: [requires `rustc` 1.42+][msrv]* |
| //! |
| //! [msrv]: #supported-rust-versions |
| //! |
| //! # Feature flags |
| //! |
| //! This crate provides a number of feature flags that enable compatibility |
| //! features with other crates in the asynchronous ecosystem: |
| //! |
| //! - `tokio`: Enables compatibility with the `tokio` crate, including |
| //! [`Instrument`] and [`WithSubscriber`] implementations for |
| //! `tokio::executor::Executor`, `tokio::runtime::Runtime`, and |
| //! `tokio::runtime::current_thread`. Enabled by default. |
| //! - `tokio-executor`: Enables compatibility with the `tokio-executor` |
| //! crate, including [`Instrument`] and [`WithSubscriber`] |
| //! implementations for types implementing `tokio_executor::Executor`. |
| //! This is intended primarily for use in crates which depend on |
| //! `tokio-executor` rather than `tokio`; in general the `tokio` feature |
| //! should be used instead. |
| //! - `std-future`: Enables compatibility with `std::future::Future`. |
| //! - `futures-01`: Enables compatibility with version 0.1.x of the [`futures`] |
| //! crate. |
| //! - `futures-03`: Enables compatibility with version 0.3.x of the `futures` |
| //! crate's `Spawn` and `LocalSpawn` traits. |
| //! - `tokio-alpha`: Enables compatibility with `tokio` 0.2's alpha releases, |
| //! including the `tokio` 0.2 `Executor` and `TypedExecutor` traits. |
| //! - `std`: Depend on the Rust standard library. |
| //! |
| //! `no_std` users may disable this feature with `default-features = false`: |
| //! |
| //! ```toml |
| //! [dependencies] |
| //! tracing-futures = { version = "0.2.5", default-features = false } |
| //! ``` |
| //! |
| //! The `tokio`, `std-future` and `std` features are enabled by default. |
| //! |
| //! [`tracing`]: https://crates.io/crates/tracing |
| //! [span]: https://docs.rs/tracing/latest/tracing/span/index.html |
| //! [`Subscriber`]: https://docs.rs/tracing/latest/tracing/subscriber/index.html |
| //! [`Instrument`]: trait.Instrument.html |
| //! [`WithSubscriber`]: trait.WithSubscriber.html |
| //! [`futures`]: https://crates.io/crates/futures |
| //! |
| //! ## Supported Rust Versions |
| //! |
| //! Tracing is built against the latest stable release. The minimum supported |
| //! version is 1.42. The current Tracing version is not guaranteed to build on |
| //! Rust versions earlier than the minimum supported version. |
| //! |
| //! Tracing follows the same compiler support policies as the rest of the Tokio |
| //! project. The current stable Rust compiler and the three most recent minor |
| //! versions before it will always be supported. For example, if the current |
| //! stable compiler version is 1.45, the minimum supported version will not be |
| //! increased past 1.42, three minor versions prior. Increasing the minimum |
| //! supported compiler version is not considered a semver breaking change as |
| //! long as doing so complies with this policy. |
| //! |
| </span><span class="attribute">#![doc(html_root_url = <span class="string">"https://docs.rs/tracing-futures/0.2.5"</span>)] |
| #![doc( |
| html_logo_url = <span class="string">"https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"</span>, |
| issue_tracker_base_url = <span class="string">"https://github.com/tokio-rs/tracing/issues/" |
| </span>)] |
| #![warn( |
| missing_debug_implementations, |
| missing_docs, |
| rust_2018_idioms, |
| unreachable_pub, |
| bad_style, |
| const_err, |
| dead_code, |
| improper_ctypes, |
| non_shorthand_field_patterns, |
| no_mangle_generic_items, |
| overflowing_literals, |
| path_statements, |
| patterns_in_fns_without_body, |
| private_in_public, |
| unconditional_recursion, |
| unused, |
| unused_allocation, |
| unused_comparisons, |
| unused_parens, |
| while_true |
| )] |
| #![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] |
| #![cfg_attr(docsrs, feature(doc_cfg), deny(broken_intra_doc_links))] |
| #[cfg(feature = <span class="string">"std-future"</span>)] |
| </span><span class="kw">use </span>pin_project::pin_project; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>stdlib; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::stdlib::{pin::Pin, task::Context}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">use </span>tracing::{dispatcher, Dispatch}; |
| |
| <span class="kw">use </span>tracing::Span; |
| |
| <span class="doccomment">/// Implementations for `Instrument`ed future executors. |
| </span><span class="kw">pub mod </span>executor; |
| |
| <span class="doccomment">/// Extension trait allowing futures, streams, sinks, and executors to be |
| /// instrumented with a `tracing` [span]. |
| /// |
| /// [span]: https://docs.rs/tracing/latest/tracing/span/index.html |
| </span><span class="kw">pub trait </span>Instrument: Sized { |
| <span class="doccomment">/// Instruments this type with the provided `Span`, returning an |
| /// `Instrumented` wrapper. |
| /// |
| /// If the instrumented type is a future, stream, or sink, the attached `Span` |
| /// will be [entered] every time it is polled. If the instrumented type |
| /// is a future executor, every future spawned on that executor will be |
| /// instrumented by the attached `Span`. |
| /// |
| /// # Examples |
| /// |
| /// Instrumenting a future: |
| /// |
| </span><span class="comment">// TODO: ignored until async-await is stable... |
| </span><span class="doccomment">/// ```rust,ignore |
| /// use tracing_futures::Instrument; |
| /// |
| /// # async fn doc() { |
| /// let my_future = async { |
| /// // ... |
| /// }; |
| /// |
| /// my_future |
| /// .instrument(tracing::info_span!("my_future")) |
| /// .await |
| /// # } |
| /// ``` |
| /// |
| /// [entered]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html#method.enter |
| </span><span class="kw">fn </span>instrument(<span class="self">self</span>, span: Span) -> Instrumented<<span class="self">Self</span>> { |
| Instrumented { inner: <span class="self">self</span>, span } |
| } |
| |
| <span class="doccomment">/// Instruments this type with the [current] `Span`, returning an |
| /// `Instrumented` wrapper. |
| /// |
| /// If the instrumented type is a future, stream, or sink, the attached `Span` |
| /// will be [entered] every time it is polled. If the instrumented type |
| /// is a future executor, every future spawned on that executor will be |
| /// instrumented by the attached `Span`. |
| /// |
| /// This can be used to propagate the current span when spawning a new future. |
| /// |
| /// # Examples |
| /// |
| </span><span class="comment">// TODO: ignored until async-await is stable... |
| </span><span class="doccomment">/// ```rust,ignore |
| /// use tracing_futures::Instrument; |
| /// |
| /// # async fn doc() { |
| /// let span = tracing::info_span!("my_span"); |
| /// let _enter = span.enter(); |
| /// |
| /// // ... |
| /// |
| /// let future = async { |
| /// tracing::debug!("this event will occur inside `my_span`"); |
| /// // ... |
| /// }; |
| /// tokio::spawn(future.in_current_span()); |
| /// # } |
| /// ``` |
| /// |
| /// [current]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html#method.current |
| /// [entered]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html#method.enter |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>in_current_span(<span class="self">self</span>) -> Instrumented<<span class="self">Self</span>> { |
| <span class="self">self</span>.instrument(Span::current()) |
| } |
| } |
| |
| <span class="doccomment">/// Extension trait allowing futures, streams, and sinks to be instrumented with |
| /// a `tracing` [`Subscriber`]. |
| /// |
| /// [`Subscriber`]: https://docs.rs/tracing/latest/tracing/subscriber/trait.Subscriber.html |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">pub trait </span>WithSubscriber: Sized { |
| <span class="doccomment">/// Attaches the provided [`Subscriber`] to this type, returning a |
| /// `WithDispatch` wrapper. |
| /// |
| /// When the wrapped type is a future, stream, or sink, the attached |
| /// subscriber will be set as the [default] while it is being polled. |
| /// When the wrapped type is an executor, the subscriber will be set as the |
| /// default for any futures spawned on that executor. |
| /// |
| /// [`Subscriber`]: https://docs.rs/tracing/latest/tracing/subscriber/trait.Subscriber.html |
| /// [default]: https://docs.rs/tracing/latest/tracing/dispatcher/index.html#setting-the-default-subscriber |
| </span><span class="kw">fn </span>with_subscriber<S>(<span class="self">self</span>, subscriber: S) -> WithDispatch<<span class="self">Self</span>> |
| <span class="kw">where |
| </span>S: Into<Dispatch>, |
| { |
| WithDispatch { |
| inner: <span class="self">self</span>, |
| dispatch: subscriber.into(), |
| } |
| } |
| |
| <span class="doccomment">/// Attaches the current [default] [`Subscriber`] to this type, returning a |
| /// `WithDispatch` wrapper. |
| /// |
| /// When the wrapped type is a future, stream, or sink, the attached |
| /// subscriber will be set as the [default] while it is being polled. |
| /// When the wrapped type is an executor, the subscriber will be set as the |
| /// default for any futures spawned on that executor. |
| /// |
| /// This can be used to propagate the current dispatcher context when |
| /// spawning a new future. |
| /// |
| /// [`Subscriber`]: https://docs.rs/tracing/latest/tracing/subscriber/trait.Subscriber.html |
| /// [default]: https://docs.rs/tracing/latest/tracing/dispatcher/index.html#setting-the-default-subscriber |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>with_current_subscriber(<span class="self">self</span>) -> WithDispatch<<span class="self">Self</span>> { |
| WithDispatch { |
| inner: <span class="self">self</span>, |
| dispatch: dispatcher::get_default(|default| default.clone()), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A future, stream, sink, or executor that has been instrumented with a `tracing` span. |
| </span><span class="attribute">#[cfg_attr(feature = <span class="string">"std-future"</span>, pin_project)] |
| #[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>Instrumented<T> { |
| <span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[pin] |
| </span>inner: T, |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std-future"</span>))] |
| </span>inner: T, |
| span: Span, |
| } |
| |
| <span class="doccomment">/// A future, stream, sink, or executor that has been instrumented with a |
| /// `tracing` subscriber. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| #[cfg_attr(feature = <span class="string">"std-future"</span>, pin_project)] |
| #[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>WithDispatch<T> { |
| <span class="comment">// cfg_attr doesn't work inside structs, apparently... |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[pin] |
| </span>inner: T, |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std-future"</span>))] |
| </span>inner: T, |
| dispatch: Dispatch, |
| } |
| |
| <span class="kw">impl</span><T: Sized> Instrument <span class="kw">for </span>T {} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std-future"</span>)))] |
| </span><span class="kw">impl</span><T: <span class="kw">crate</span>::stdlib::future::Future> <span class="kw">crate</span>::stdlib::future::Future <span class="kw">for </span>Instrumented<T> { |
| <span class="kw">type </span>Output = T::Output; |
| |
| <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>>) -> <span class="kw">crate</span>::stdlib::task::Poll<<span class="self">Self</span>::Output> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| this.inner.poll(cx) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"futures-01"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"futures-01"</span>)))] |
| </span><span class="kw">impl</span><T: futures_01::Future> futures_01::Future <span class="kw">for </span>Instrumented<T> { |
| <span class="kw">type </span>Item = T::Item; |
| <span class="kw">type </span>Error = T::Error; |
| |
| <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>) -> futures_01::Poll<<span class="self">Self</span>::Item, <span class="self">Self</span>::Error> { |
| <span class="kw">let </span>_enter = <span class="self">self</span>.span.enter(); |
| <span class="self">self</span>.inner.poll() |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"futures-01"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"futures-01"</span>)))] |
| </span><span class="kw">impl</span><T: futures_01::Stream> futures_01::Stream <span class="kw">for </span>Instrumented<T> { |
| <span class="kw">type </span>Item = T::Item; |
| <span class="kw">type </span>Error = T::Error; |
| |
| <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>) -> futures_01::Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>, <span class="self">Self</span>::Error> { |
| <span class="kw">let </span>_enter = <span class="self">self</span>.span.enter(); |
| <span class="self">self</span>.inner.poll() |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"futures-01"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"futures-01"</span>)))] |
| </span><span class="kw">impl</span><T: futures_01::Sink> futures_01::Sink <span class="kw">for </span>Instrumented<T> { |
| <span class="kw">type </span>SinkItem = T::SinkItem; |
| <span class="kw">type </span>SinkError = T::SinkError; |
| |
| <span class="kw">fn </span>start_send( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| item: <span class="self">Self</span>::SinkItem, |
| ) -> futures_01::StartSend<<span class="self">Self</span>::SinkItem, <span class="self">Self</span>::SinkError> { |
| <span class="kw">let </span>_enter = <span class="self">self</span>.span.enter(); |
| <span class="self">self</span>.inner.start_send(item) |
| } |
| |
| <span class="kw">fn </span>poll_complete(<span class="kw-2">&mut </span><span class="self">self</span>) -> futures_01::Poll<(), <span class="self">Self</span>::SinkError> { |
| <span class="kw">let </span>_enter = <span class="self">self</span>.span.enter(); |
| <span class="self">self</span>.inner.poll_complete() |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"futures-03"</span>, feature = <span class="string">"std-future"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(feature = <span class="string">"futures-03"</span>, feature = <span class="string">"std-future"</span>))))] |
| </span><span class="kw">impl</span><T: futures::Stream> futures::Stream <span class="kw">for </span>Instrumented<T> { |
| <span class="kw">type </span>Item = T::Item; |
| |
| <span class="kw">fn </span>poll_next( |
| <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>>, |
| ) -> futures::task::Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| T::poll_next(this.inner, cx) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"futures-03"</span>, feature = <span class="string">"std-future"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(feature = <span class="string">"futures-03"</span>, feature = <span class="string">"std-future"</span>))))] |
| </span><span class="kw">impl</span><I, T: futures::Sink<I>> futures::Sink<I> <span class="kw">for </span>Instrumented<T> |
| <span class="kw">where |
| </span>T: futures::Sink<I>, |
| { |
| <span class="kw">type </span>Error = T::Error; |
| |
| <span class="kw">fn </span>poll_ready( |
| <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>>, |
| ) -> futures::task::Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| T::poll_ready(this.inner, cx) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: I) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| T::start_send(this.inner, item) |
| } |
| |
| <span class="kw">fn </span>poll_flush( |
| <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>>, |
| ) -> futures::task::Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| T::poll_flush(this.inner, cx) |
| } |
| |
| <span class="kw">fn </span>poll_close( |
| <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>>, |
| ) -> futures::task::Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>_enter = this.span.enter(); |
| T::poll_close(this.inner, cx) |
| } |
| } |
| |
| <span class="kw">impl</span><T> Instrumented<T> { |
| <span class="doccomment">/// Borrows the `Span` that this type is instrumented by. |
| </span><span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Span { |
| <span class="kw-2">&</span><span class="self">self</span>.span |
| } |
| |
| <span class="doccomment">/// Mutably borrows the `Span` that this type is instrumented by. |
| </span><span class="kw">pub fn </span>span_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Span { |
| <span class="kw-2">&mut </span><span class="self">self</span>.span |
| } |
| |
| <span class="doccomment">/// Borrows the wrapped type. |
| </span><span class="kw">pub fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Mutably borrows the wrapped type. |
| </span><span class="kw">pub fn </span>inner_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Get a pinned reference to the wrapped type. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std-future"</span>)))] |
| </span><span class="kw">pub fn </span>inner_pin_ref(<span class="self">self</span>: Pin<<span class="kw-2">&</span><span class="self">Self</span>>) -> Pin<<span class="kw-2">&</span>T> { |
| <span class="self">self</span>.project_ref().inner |
| } |
| |
| <span class="doccomment">/// Get a pinned mutable reference to the wrapped type. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std-future"</span>)))] |
| </span><span class="kw">pub fn </span>inner_pin_mut(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> Pin<<span class="kw-2">&mut </span>T> { |
| <span class="self">self</span>.project().inner |
| } |
| |
| <span class="doccomment">/// Consumes the `Instrumented`, returning the wrapped type. |
| /// |
| /// Note that this drops the span. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="self">self</span>.inner |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl</span><T: Sized> WithSubscriber <span class="kw">for </span>T {} |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"futures-01"</span>, feature = <span class="string">"std"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(feature = <span class="string">"futures-01"</span>, feature = <span class="string">"std"</span>))))] |
| </span><span class="kw">impl</span><T: futures_01::Future> futures_01::Future <span class="kw">for </span>WithDispatch<T> { |
| <span class="kw">type </span>Item = T::Item; |
| <span class="kw">type </span>Error = T::Error; |
| |
| <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>) -> futures_01::Poll<<span class="self">Self</span>::Item, <span class="self">Self</span>::Error> { |
| <span class="kw">let </span>inner = <span class="kw-2">&mut </span><span class="self">self</span>.inner; |
| dispatcher::with_default(<span class="kw-2">&</span><span class="self">self</span>.dispatch, || inner.poll()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"std-future"</span>, feature = <span class="string">"std"</span>))] |
| #[cfg_attr(docsrs, doc(cfg(all(feature = <span class="string">"std-future"</span>, feature = <span class="string">"std"</span>))))] |
| </span><span class="kw">impl</span><T: <span class="kw">crate</span>::stdlib::future::Future> <span class="kw">crate</span>::stdlib::future::Future <span class="kw">for </span>WithDispatch<T> { |
| <span class="kw">type </span>Output = T::Output; |
| |
| <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>>) -> <span class="kw">crate</span>::stdlib::task::Poll<<span class="self">Self</span>::Output> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>dispatch = this.dispatch; |
| <span class="kw">let </span>future = this.inner; |
| dispatcher::with_default(dispatch, || future.poll(cx)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl</span><T> WithDispatch<T> { |
| <span class="doccomment">/// Wrap a future, stream, sink or executor with the same subscriber as this WithDispatch. |
| </span><span class="kw">pub fn </span>with_dispatch<U>(<span class="kw-2">&</span><span class="self">self</span>, inner: U) -> WithDispatch<U> { |
| WithDispatch { |
| dispatch: <span class="self">self</span>.dispatch.clone(), |
| inner, |
| } |
| } |
| |
| <span class="doccomment">/// Borrows the `Dispatch` that this type is instrumented by. |
| </span><span class="kw">pub fn </span>dispatch(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Dispatch { |
| <span class="kw-2">&</span><span class="self">self</span>.dispatch |
| } |
| |
| <span class="doccomment">/// Get a pinned reference to the wrapped type. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std-future"</span>)))] |
| </span><span class="kw">pub fn </span>inner_pin_ref(<span class="self">self</span>: Pin<<span class="kw-2">&</span><span class="self">Self</span>>) -> Pin<<span class="kw-2">&</span>T> { |
| <span class="self">self</span>.project_ref().inner |
| } |
| |
| <span class="doccomment">/// Get a pinned mutable reference to the wrapped type. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std-future"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std-future"</span>)))] |
| </span><span class="kw">pub fn </span>inner_pin_mut(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> Pin<<span class="kw-2">&mut </span>T> { |
| <span class="self">self</span>.project().inner |
| } |
| |
| <span class="doccomment">/// Borrows the wrapped type. |
| </span><span class="kw">pub fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Mutably borrows the wrapped type. |
| </span><span class="kw">pub fn </span>inner_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Consumes the `WithDispatch`, returning the wrapped type. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="self">self</span>.inner |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span><span class="self">self</span>::support <span class="kw">as </span>test_support; |
| <span class="comment">// This has to have the same name as the module in `tracing`. |
| </span><span class="attribute">#[path = <span class="string">"../../tracing/tests/support/mod.rs"</span>] |
| #[cfg(test)] |
| #[allow(unreachable_pub)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>support; |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::{test_support::<span class="kw-2">*</span>, <span class="kw-2">*</span>}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"futures-01"</span>)] |
| </span><span class="kw">mod </span>futures_01_tests { |
| <span class="kw">use </span>futures_01::{future, stream, task, Async, Future, Stream}; |
| <span class="kw">use </span>tracing::subscriber::with_default; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">struct </span>PollN<T, E> { |
| and_return: <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><T, E>>, |
| finish_at: usize, |
| polls: usize, |
| } |
| |
| <span class="kw">impl </span>PollN<(), ()> { |
| <span class="kw">fn </span>new_ok(finish_at: usize) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| and_return: <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(())), |
| finish_at, |
| polls: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>new_err(finish_at: usize) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| and_return: <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(())), |
| finish_at, |
| polls: <span class="number">0</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, E> futures_01::Future <span class="kw">for </span>PollN<T, E> { |
| <span class="kw">type </span>Item = T; |
| <span class="kw">type </span>Error = E; |
| <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>) -> futures_01::Poll<<span class="self">Self</span>::Item, <span class="self">Self</span>::Error> { |
| <span class="self">self</span>.polls += <span class="number">1</span>; |
| <span class="kw">if </span><span class="self">self</span>.polls == <span class="self">self</span>.finish_at { |
| <span class="self">self</span>.and_return |
| .take() |
| .expect(<span class="string">"polled after ready"</span>) |
| .map(Async::Ready) |
| } <span class="kw">else </span>{ |
| task::current().notify(); |
| <span class="prelude-val">Ok</span>(Async::NotReady) |
| } |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>future_enter_exit_is_reasonable() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .drop_span(span::mock().named(<span class="string">"foo"</span>)) |
| .done() |
| .run_with_handle(); |
| with_default(subscriber, || { |
| PollN::new_ok(<span class="number">2</span>) |
| .instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">"foo"</span>)) |
| .wait() |
| .unwrap(); |
| }); |
| handle.assert_finished(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>future_error_ends_span() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .drop_span(span::mock().named(<span class="string">"foo"</span>)) |
| .done() |
| .run_with_handle(); |
| with_default(subscriber, || { |
| PollN::new_err(<span class="number">2</span>) |
| .instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">"foo"</span>)) |
| .wait() |
| .unwrap_err(); |
| }); |
| |
| handle.assert_finished(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>stream_enter_exit_is_reasonable() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .drop_span(span::mock().named(<span class="string">"foo"</span>)) |
| .run_with_handle(); |
| with_default(subscriber, || { |
| stream::iter_ok::<<span class="kw">_</span>, ()>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]) |
| .instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">"foo"</span>)) |
| .for_each(|<span class="kw">_</span>| future::ok(())) |
| .wait() |
| .unwrap(); |
| }); |
| handle.assert_finished(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>span_follows_future_onto_threadpool() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"a"</span>)) |
| .enter(span::mock().named(<span class="string">"b"</span>)) |
| .exit(span::mock().named(<span class="string">"b"</span>)) |
| .enter(span::mock().named(<span class="string">"b"</span>)) |
| .exit(span::mock().named(<span class="string">"b"</span>)) |
| .drop_span(span::mock().named(<span class="string">"b"</span>)) |
| .exit(span::mock().named(<span class="string">"a"</span>)) |
| .drop_span(span::mock().named(<span class="string">"a"</span>)) |
| .done() |
| .run_with_handle(); |
| <span class="kw">let </span><span class="kw-2">mut </span>runtime = tokio::runtime::Runtime::new().unwrap(); |
| with_default(subscriber, || { |
| <span class="macro">tracing::trace_span!</span>(<span class="string">"a"</span>).in_scope(|| { |
| <span class="kw">let </span>future = PollN::new_ok(<span class="number">2</span>) |
| .instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">"b"</span>)) |
| .map(|<span class="kw">_</span>| { |
| <span class="macro">tracing::trace_span!</span>(<span class="string">"c"</span>).in_scope(|| { |
| <span class="comment">// "c" happens _outside_ of the instrumented future's |
| // span, so we don't expect it. |
| </span>}) |
| }); |
| runtime.block_on(Box::new(future)).unwrap(); |
| }) |
| }); |
| handle.assert_finished(); |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"futures-03"</span>, feature = <span class="string">"std-future"</span>))] |
| </span><span class="kw">mod </span>futures_03_tests { |
| <span class="kw">use </span>futures::{future, sink, stream, FutureExt, SinkExt, StreamExt}; |
| <span class="kw">use </span>tracing::subscriber::with_default; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>stream_enter_exit_is_reasonable() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .drop_span(span::mock().named(<span class="string">"foo"</span>)) |
| .run_with_handle(); |
| with_default(subscriber, || { |
| Instrument::instrument(stream::iter(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]), <span class="macro">tracing::trace_span!</span>(<span class="string">"foo"</span>)) |
| .for_each(|<span class="kw">_</span>| future::ready(())) |
| .now_or_never() |
| .unwrap(); |
| }); |
| handle.assert_finished(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>sink_enter_exit_is_reasonable() { |
| <span class="kw">let </span>(subscriber, handle) = subscriber::mock() |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .enter(span::mock().named(<span class="string">"foo"</span>)) |
| .exit(span::mock().named(<span class="string">"foo"</span>)) |
| .drop_span(span::mock().named(<span class="string">"foo"</span>)) |
| .run_with_handle(); |
| with_default(subscriber, || { |
| Instrument::instrument(sink::drain(), <span class="macro">tracing::trace_span!</span>(<span class="string">"foo"</span>)) |
| .send(<span class="number">1u8</span>) |
| .now_or_never() |
| .unwrap() |
| .unwrap() |
| }); |
| handle.assert_finished(); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tracing_futures" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
