> { D A // this creates an event at the DEBUG level with two fields: I F // - `excitement`, with the key "excitement" and the value "yay!" \ Y // - `message`, with the key "message" and the value "hello! I'm gonna shave a yak." Tӊ // ފ_ \ // unlike other fields, `message`'s shorthand initialization is just the string itself. E B debug!(excitement = "yay!", "hello! I'm gonna shave a yak."); if yak == 3 { + ( warn!("could not locate yak!"); ƌ\ Y // note that this is intended to demonstrate `tracing`'s features, not idiomatic Y V // error handling! in a library or application, you should consider returning X U // a dedicated `YakError`. libraries like snafu or thiserror make this easy. ֎[ X return Err(io::Error::new(io::ErrorKind::Other, "shaving yak failed!").into());
} else { Ï. + debug!("yak shaved successfully"); L } t Ok(()) , , ) pub fn shave_all(yaks: usize) -> usize { I F // Constructs a new span named "shaving_yaks" at the TRACE level, J G // and a field whose key is "yaks". This is equivalent to writing: Tב G D // let span = span!(Level::TRACE, "shaving_yaks", yaks = yaks); T ? < // local variables (`yaks`) can be used as field values A > // without an assignment, similar to struct initializers. H E let _span = span!(Level::TRACE, "shaving_yaks", yaks).entered(); info!("shaving yaks"); let mut yaks_shaved = 0; Ȕ for yak in 1..=yaks { ! let res = shave(yak); . + debug!(yak, shaved = res.is_ok()); ) & if let Err(ref error) = res { V S // Like spans, events can also use the field initialization shorthand. I F // In this instance, `yak` is the field being initalized. L I error!(yak, error = error.as_ref(), "failed to shave yak!"); ӗ } else { ! yaks_shaved += 1; l
} debug!(yaks_shaved); L Ø ǘ yaks_shaved ,ۘ <Н ## In libraries K H Libraries should link only to the `tracing` crate, and use the provided љF C macros to record whatever information will be useful to downstream t consumers. ## In executables ŚK H In order to record trace events, executables have to use a `Subscriber` I F implementation compatible with `tracing`. A `Subscriber` implements a ۛK H way of collecting trace data, such as by logging it to standard output. M J This library does not contain any `Subscriber` implementations; these are 0 - provided by [other crates](#related-crates). N K The simplest way to use a subscriber is to call the [`set_global_default`] l
function: <Н ̗ extern crate tracing; # pub struct FooSubscriber; ў> ; # use tracing::{span::{Id, Attributes, Record}, Metadata}; 2 / # impl tracing::Subscriber for FooSubscriber { ßD A # fn new_span(&self, _: &Attributes) -> Id { Id::from_u64(0) } / , # fn record(&self, _: &Id, _: &Record) {} . + # fn event(&self, _: &tracing::Event) {} 8 5 # fn record_follows_from(&self, _: &Id, _: &Id) {} 9 6 # fn enabled(&self, _: &Metadata) -> bool { false } ڡ" # fn enter(&self, _: &Id) {} ! # fn exit(&self, _: &Id) {} < ԧ # impl FooSubscriber { ¢* ' # fn new() -> Self { FooSubscriber } < - * let my_subscriber = FooSubscriber::new(); : 7 tracing::subscriber::set_global_default(my_subscriber) 2 / .expect("setting tracing default failed"); < <Н G D P M Warning: In general, libraries should not call ԥM J set_global_default()! Doing so will cause conflicts when L I executables that depend on the library try to set the default later. T
F C This subscriber will be used as the default in all threads for the ŧK H remainder of the duration of the program, similar to setting the logger in the `log` crate. D A In addition, the default subscriber can be set through using the H E [`with_default`] function. This follows the `tokio` pattern of using O L closures to represent executing code in a context that is exited at the end of the closure. For example: \ ܪ> 2 ΫD / ì. 8 9 " ! < Բ ͮ* < - į # #[cfg(feature = "std")] 9 6 tracing::subscriber::with_default(my_subscriber, || { N K // Any trace events generated in this closure or by functions it calls 0 - // will be collected by `my_subscriber`. 4 }) < <Н K H This approach allows trace data to be collected by multiple subscribers X U within different contexts in the program. Note that the override only applies to the ܲX U currently executing thread; other threads will not see the change from with_default. Y V Any trace events generated outside the context of a subscriber will not be collected. N K Once a subscriber has been set, instrumentation points may be added to the 2 / executable using the `tracing` crate's macros. ԝ ## `log` Compatibility M J The [`log`] crate provides a simple, lightweight logging facade for Rust. I F While `tracing` builds upon `log`'s foundation with richer structured ԶO L diagnostic data, `log`'s simplicity and ubiquity make it the "lowest common K H denominator" for text-based logging in Rust — a vast majority of Rust O L libraries and applications either emit or consume `log` records. Therefore, O L `tracing` provides multiple forms of interoperability with `log`: `tracing` M J instrumentation can emit `log` records, and a compatibility layer enables O L `tracing` [`Subscriber`]s to consume `log` records as `tracing` [`Event`]s. ### Emitting `log` Records Ѻ պM J This crate provides two feature flags, "log" and "log-always", which will O L cause [spans] and [events] to emit `log` records. When the "log" feature is O L enabled, if no `tracing` `Subscriber` is active, invoking an event macro or üJ G creating a span with fields will emit a `log` record. This is intended M J primarily for use in libraries which wish to emit diagnostics that can be ܽK H consumed by applications using `tracing` *or* `log`, without paying the O L additional overhead of emitting both forms of diagnostics when `tracing` is \ in use. L I Enabling the "log-always" feature will cause `log` records to be emitted տM J even if a `tracing` `Subscriber` _is_ set. This is intended to be used in N K applications where a `log` `Logger` is being used to record a textual log, L I and `tracing` is used only to record other forms of diagnostics (such as O L metrics, profiling, or distributed tracing data). Unlike the "log" feature, P M libraries generally should **not** enable the "log-always" feature, as doing Q N so will prevent applications from being able to opt out of the `log` records. E B See [here][flags] for more details on this crate's feature flags. P M The generated `log` records' messages will be a string representation of the L I span or event's fields, and all additional information recorded by `log` N K (target, verbosity level, module path, file, and line number) will also be L I populated. Additionally, `log` records are also generated when spans are P M entered, exited, and closed. Since these additional span lifecycle logs have O L the potential to be very verbose, and don't include additional fields, they K H will always be emitted at the `Trace` level, rather than inheriting the L I level of the span that generated them. Furthermore, they are categorized G D under a separate `log` target, "tracing::span" (and its sub-target, P M "tracing::span::active", for the logs on entering and exiting a span), which M J may be enabled or disabled separately from other `log` records emitted by t `tracing`. ### Consuming `log` Records B ? The [`tracing-log`] crate provides a compatibility layer which M J allows a `tracing` [`Subscriber`] to consume `log` records as though they O L were `tracing` [events]. This allows applications using `tracing` to record P M the logs emitted by dependencies using `log` as events within the context of N K the application's trace tree. See [that crate's documentation][log-tracer]
for details. g d [log-tracer]: https://docs.rs/tracing-log/latest/tracing_log/#convert-log-records-to-tracing-events ## Related Crates T Q In addition to `tracing` and `tracing-core`, the [`tokio-rs/tracing`] repository X U contains several additional crates designed to be used with the `tracing` ecosystem. R O This includes a collection of `Subscriber` implementations, as well as utility K H and adapter crates to assist in writing `Subscriber`s and instrumenting applications. E B In particular, the following crates are likely to be of interest: L I - [`tracing-futures`] provides a compatibility layer with the `futures` U R crate, allowing spans to be attached to `Future`s, `Stream`s, and `Executor`s. G D - [`tracing-subscriber`] provides `Subscriber` implementations and R O utilities for working with `Subscriber`s. This includes a [`FmtSubscriber`] O L `FmtSubscriber` for logging formatted trace data to stdout, with similar < 9 filtering and formatting to the [`env_logger`] crate. M J - [`tracing-log`] provides a compatibility layer with the [`log`] crate, L I allowing log messages to be recorded as `tracing` `Event`s within the E B trace tree. This is useful when a project using `tracing` have > ; dependencies which use `log`. Note that if you're using J G `tracing-subscriber`'s `FmtSubscriber`, you don't need to depend on `tracing-log` directly. K H - [`tracing-appender`] provides utilities for outputting tracing data, 9 6 including a file appender and non blocking writer. I F Additionally, there are also several third-party crates which are not 5 2 maintained by the `tokio` project. These include: T Q - [`tracing-timing`] implements inter-event timing metrics on top of `tracing`. N K It provides a subscriber that records the time elapsed between pairs of 1 . `tracing` events and generates histograms. M J - [`tracing-opentelemetry`] provides a subscriber for emitting traces to > ; [OpenTelemetry]-compatible distributed tracing systems. - [`tracing-honeycomb`] Provides a layer that reports traces spanning multiple machines to [honeycomb.io]. Backed by [`tracing-distributed`]. - [`tracing-distributed`] Provides a generic implementation of a layer that reports traces spanning multiple machines to some backend. ^ [ - [`tracing-actix-web`] provides `tracing` integration for the `actix-web` web framework. M J - [`tracing-actix`] provides `tracing` integration for the `actix` actor framework. u r - [`axum-insights`] provides `tracing` integration and Application insights export for the `axum` web framework. O L - [`tracing-gelf`] implements a subscriber for exporting traces in Greylog GELF format. J G - [`tracing-coz`] provides integration with the [coz] causal profiler (Linux-only). a ^ - [`tracing-bunyan-formatter`] provides a layer implementation that reports events and spans < 9 in [bunyan] format, enriched with timing information. S P - [`tracing-wasm`] provides a `Subscriber`/`Layer` implementation that reports _ \ events and spans via browser `console.log` and [User Timing API (`window.performance`)]. W T - [`tracing-web`] provides a layer implementation of level-aware logging of events d a to web browsers' `console.*` and span events to the [User Timing API (`window.performance`)]. b _ - [`tide-tracing`] provides a [tide] middleware to trace all incoming requests and responses. L I - [`test-log`] takes care of initializing `tracing` for tests, based on D A environment variables with an `env_logger` compatible syntax. O L - [`tracing-unwrap`] provides convenience methods to report failed unwraps 7 4 on `Result` or `Option` types to a `Subscriber`. T Q - [`diesel-tracing`] provides integration with [`diesel`] database connections. S P - [`tracing-tracy`] provides a way to collect [Tracy] profiles in instrumented applications. V S - [`tracing-elastic-apm`] provides a layer for reporting traces to [Elastic APM]. J G - [`tracing-etw`] provides a layer for emitting Windows [ETW] events. O L - [`tracing-fluent-assertions`] provides a fluent assertions-style testing @ = framework for validating the behavior of `tracing` spans. W T - [`sentry-tracing`] provides a layer for reporting events and traces to [Sentry]. V S - [`tracing-forest`] provides a subscriber that preserves contextual coherence by A > grouping together logs from the same spans during writing. M J - [`tracing-loki`] provides a layer for shipping logs to [Grafana Loki]. ` ] - [`tracing-logfmt`] provides a layer that formats events and spans into the logfmt format. T Q - [`reqwest-tracing`] provides a middleware to trace [`reqwest`] HTTP requests. X U - [`tracing-cloudwatch`] provides a layer that sends events to AWS CloudWatch Logs. ] Z - [`clippy-tracing`] provides a tool to add, remove and check for `tracing::instrument`. - [`json-subscriber`] provides a subscriber for emitting JSON logs. The output can be customized much more than with [`tracing-subscriber`]'s JSON output. M J If you're the maintainer of a `tracing` ecosystem crate not listed above, B ? please let us know! We'd love to add your project to the list! M J [`tracing-opentelemetry`]: https://crates.io/crates/tracing-opentelemetry . + [OpenTelemetry]: https://opentelemetry.io/ E B [`tracing-honeycomb`]: https://crates.io/crates/tracing-honeycomb I F [`tracing-distributed`]: https://crates.io/crates/tracing-distributed - * [honeycomb.io]: https://www.honeycomb.io/ E B [`tracing-actix-web`]: https://crates.io/crates/tracing-actix-web = : [`tracing-actix`]: https://crates.io/crates/tracing-actix = : [`axum-insights`]: https://crates.io/crates/axum-insights ; 8 [`tracing-gelf`]: https://crates.io/crates/tracing-gelf 9 6 [`tracing-coz`]: https://crates.io/crates/tracing-coz . + [coz]: https://github.com/plasma-umass/coz S P [`tracing-bunyan-formatter`]: https://crates.io/crates/tracing-bunyan-formatter 3 0 [bunyan]: https://github.com/trentm/node-bunyan 2 / [`tracing-wasm`]: https://docs.rs/tracing-wasm 0 - [`tracing-web`]: https://docs.rs/tracing-web n k [User Timing API (`window.performance`)]: https://developer.mozilla.org/en-US/docs/Web/API/User_Timing_API ; 8 [`tide-tracing`]: https://crates.io/crates/tide-tracing ) & [tide]: https://crates.io/crates/tide 3 0 [`test-log`]: https://crates.io/crates/test-log 6 3 [`tracing-unwrap`]: https://docs.rs/tracing-unwrap / , [`diesel`]: https://crates.io/crates/diesel ? < [`diesel-tracing`]: https://crates.io/crates/diesel-tracing ځ= : [`tracing-tracy`]: https://crates.io/crates/tracing-tracy - * [Tracy]: https://github.com/wolfpld/tracy ƂI F [`tracing-elastic-apm`]: https://crates.io/crates/tracing-elastic-apm - * [Elastic APM]: https://www.elastic.co/apm X U [`tracing-etw`]: https://github.com/microsoft/rust_win_etw/tree/main/win_etw_tracing Q N [ETW]: https://docs.microsoft.com/en-us/windows/win32/etw/about-event-tracing U R [`tracing-fluent-assertions`]: https://crates.io/crates/tracing-fluent-assertions ? < [`sentry-tracing`]: https://crates.io/crates/sentry-tracing ( % [Sentry]: https://sentry.io/welcome/ ? < [`tracing-forest`]: https://crates.io/crates/tracing-forest ; 8 [`tracing-loki`]: https://crates.io/crates/tracing-loki 1 . [Grafana Loki]: https://grafana.com/oss/loki/ և? < [`tracing-logfmt`]: https://crates.io/crates/tracing-logfmt A > [`reqwest-tracing`]: https://crates.io/crates/reqwest-tracing ؈1 . [`reqwest`]: https://crates.io/crates/reqwest G D [`tracing-cloudwatch`]: https://crates.io/crates/tracing-cloudwatch ҉? < [`clippy-tracing`]: https://crates.io/crates/clippy-tracing A > [`json-subscriber`]: https://crates.io/crates/json-subscriber Ԋ ؊A > K H Note: Some of these ecosystem crates are currently S P unreleased and/or in earlier stages of development. They may be less stable @ = than tracing and tracing-core. T Ԋ ## Crate Feature Flags 6 3 The following crate [feature flags] are available: A > * A set of features controlling the [static verbosity level]. P M * `log`: causes trace instrumentation points to emit [`log`] records as well O L as trace events, if a default `tracing` subscriber has not been set. This ǏP M is intended for use in libraries whose users may be using either `tracing` | or `log`. P M * `log-always`: Emit `log` records from all `tracing` spans and events, even H E if a `tracing` subscriber has been set. This should be set only by L I applications which intend to collect traces and logs separately; if an O L adapter is used to convert `log` records into `tracing` events, this will ߒ& # cause duplicate events to occur. G D * `attributes`: Includes support for the `#[instrument]` attribute. ΓO L This is on by default, but does bring in the `syn` crate as a dependency, M J which may add to the compile time of crates that do not already use it. F C * `std`: Depend on the Rust standard library (enabled by default). N K `no_std` users may disable this feature with `default-features = false`: l
```toml [dependencies] @ = tracing = { version = "0.1.38", default-features = false } L ``` Aλ Q N Note: tracing's no_std support ' $ requires liballoc. T Ø ǘ ### Unstable Features W T These feature flags enable **unstable** features. The public API may break in 0.1.x V S releases. To enable these features, the `--cfg tracing_unstable` must be passed to ܔ `rustc` when compiling. A > The following unstable feature flags are currently available: H E * `valuable`: Enables support for recording [field values] using the Û [`valuable`] crate. ݛ # #### Enabling Unstable Features O L The easiest way to set the `tracing_unstable` cfg is to use the `RUSTFLAGS` ٜ/ , env variable when running `cargo` commands: d ```shell 2 / RUSTFLAGS="--cfg tracing_unstable" cargo build <͝Н ՝N K Alternatively, the following can be added to the `.cargo/config` file in a B ? project to automatically enable the cfg flag for that project: \ \ [build] - * rustflags = ["--cfg", "tracing_unstable"] <Н a ^ [feature flags]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section [field values]: crate::field 3 0 [`valuable`]: https://crates.io/crates/valuable ## Supported Rust Versions M J Tracing is built against the latest stable release. The minimum supported N K version is 1.65. The current Tracing version is not guaranteed to build on = : Rust versions earlier than the minimum supported version. O L Tracing follows the same compiler support policies as the rest of the Tokio ʣM J project. The current stable Rust compiler and the three most recent minor L I versions before it will always be supported. For example, if the current N K stable compiler version is 1.69, the minimum supported version will not be K H increased past 1.66, three minor versions prior. Increasing the minimum L I supported compiler version is not considered a semver breaking change as ͦ/ , long as doing so complies with this policy. + ( [`log`]: https://docs.rs/log/0.4.6/log/ [span]: mod@span § [spans]: mod@span ا [`Span`]: span::Span & # [`in_scope`]: span::Span::in_scope [event]: Event [events]: Event * ' [`Subscriber`]: subscriber::Subscriber 6 3 [Subscriber::event]: subscriber::Subscriber::event , ) [`enter`]: subscriber::Subscriber::enter Ω* ' [`exit`]: subscriber::Subscriber::exit 0 - [`enabled`]: subscriber::Subscriber::enabled Ī [metadata]: Metadata ê& # [`field::display`]: field::display " [`field::debug`]: field::debug : 7 [`set_global_default`]: subscriber::set_global_default ȫ. + [`with_default`]: subscriber::with_default = : [`tokio-rs/tracing`]: https://github.com/tokio-rs/tracing A > [`tracing-futures`]: https://crates.io/crates/tracing-futures G D [`tracing-subscriber`]: https://crates.io/crates/tracing-subscriber 9 6 [`tracing-log`]: https://crates.io/crates/tracing-log ? < [`tracing-timing`]: https://crates.io/crates/tracing-timing C @ [`tracing-appender`]: https://crates.io/crates/tracing-appender 7 4 [`env_logger`]: https://crates.io/crates/env_logger n k [`FmtSubscriber`]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/fmt/struct.Subscriber.html @ = [static verbosity level]: level_filters#compile-time-filters c ` [instrument]: https://docs.rs/tracing-attributes/latest/tracing_attributes/attr.instrument.html ɱ! [flags]: #crate-feature-flags Ȳ ˲ 8 lѲ ߲ 7 Lhttps://raw.githubusercontent.com/tokio-rs/tracing/main/assets/logo-type.png N $ 8 Ƴ 7 Jhttps://raw.githubusercontent.com/tokio-rs/tracing/main/assets/favicon.ico ȳL $ 8 7 +https://github.com/tokio-rs/tracing/issues/ - Ų J1<
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\ $ , 8 $ , , 8 % ܊ P M Tests whether an event with the specified level and target would be enabled. X U This is similar to [`enabled!`], but queries the current subscriber specifically for ÅB ? an event, whereas [`enabled!`] queries for an event _or_ span. P M See the documentation for [`enabled!]` for more details on using this macro. ۆ See also [`span_enabled!`]. t \ * ' # use tracing::{event_enabled, Level}; ɇ9 6 if event_enabled!(target: "my_crate", Level::DEBUG) { ! // some expensive work... , t // simpler % " if event_enabled!(Level::DEBUG) { !
, // with fields 0 - if event_enabled!(Level::DEBUG, foo_field) { ̉!
, < Н [`enabled!`]: crate::enabled * ' [`span_enabled!`]: crate::span_enabled &|̊ ߋ , , 8 rest $ & 8
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̰ Q N Checks whether a span or event is [enabled] based on the provided [metadata]. ) & [enabled]: crate::Subscriber::enabled [metadata]: crate::Metadata ǔ ˔E B This macro is a specialized tool: it is intended to be used prior C @ to an expensive computation required *just* for that event, but ՕB ? *cannot* be done as part of an argument to that event, such as G D when multiple events are emitted (e.g., iterating over a collection ) & and emitting an event for each item). \ ˸ O L [Subscribers] can make filtering decisions based all the data included in a O L span or event's [`Metadata`]. This means that it is possible for `enabled!` L I to return a _false positive_ (indicating that something would be enabled I F when it actually would not be) or a _false negative_ (indicating that ՙC @ something would be disabled when it would actually be enabled). 0 - [Subscribers]: crate::subscriber::Subscriber Κ+ ( [`Metadata`]: crate::metadata::Metadata L I This occurs when a subscriber is using a _more specific_ filter than the ˛N K metadata provided to the `enabled!` macro. Some situations that can result 2 / in false positives or false negatives include: ͜ ќN K - If a subscriber is using a filter which may enable a span or event based L I on field names, but `enabled!` is invoked without listing field names, K H `enabled!` may return a false negative if a specific field name would P M cause the subscriber to enable something that would otherwise be disabled. T Q - If a subscriber is using a filter which enables or disables specific events by ߟL I file path and line number, a particular event may be enabled/disabled N K even if an `enabled!` invocation with the same level, target, and fields indicated otherwise. X U - The subscriber can choose to enable _only_ spans or _only_ events, which `enabled` will not reflect. Q N `enabled!()` requires a [level](crate::Level) argument, an optional `target:` ݢQ N argument, and an optional set of field names. If the fields are not provided, G D they are considered to be unknown. `enabled!` attempts to match the I F syntax of `event!()` as closely as possible, which can be seen in the examples below. դ t٤ P M If the current subscriber is interested in recording `DEBUG`-level spans and K H events in the current file and module path, this will evaluate to true: \ " use tracing::{enabled, Level}; if enabled!(Level::DEBUG) { ܦ!
, < Н I F If the current subscriber is interested in recording spans and events ڧO L in the current file and module path, with the target "my_crate", and at the / , level `DEBUG`, this will evaluate to true: \ڨ $ ! # use tracing::{enabled, Level}; 3 0 if enabled!(target: "my_crate", Level::DEBUG) { !
, < Н I G D in the current file and module path, with the target "my_crate", at I F the level `DEBUG`, and with a field named "hello", this will evaluate dϫ to true: ܫ \ $ : 7 if enabled!(target: "my_crate", Level::DEBUG, hello) { ̬!
, < Н # Alternatives : 7 `enabled!` queries subscribers with [`Metadata`] where ҭD A [`is_event`] and [`is_span`] both return `false`. Alternatively, F C use [`event_enabled!`] or [`span_enabled!`] to ensure one of these ޮ returns true. ! [`Metadata`]: crate::Metadata + ( [`is_event`]: crate::Metadata::is_event Ư) & [`is_span`]: crate::Metadata::is_span
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% + ( Constructs an event at the trace level. H E This functions similarly to the [`event!`] macro. See [the top-level = : documentation][lib] for details on the syntax accepted by | [`event!`]: crate::event! ! t \ use tracing::trace; F C # #[derive(Debug, Copy, Clone)] struct Position { x: f32, y: f32 } # impl Position { 3 0 # const ORIGIN: Self = Self { x: 0.0, y: 0.0 }; . + # fn dist(&self, other: Position) -> f32 { N K # let x = (other.x - self.x).exp2(); let y = (self.y - other.y).exp2(); # (x + y).sqrt() < < / , let pos = Position { x: 3.234, y: -1.223 }; 1 . let origin_dist = pos.dist(Position::ORIGIN); * ' trace!(position = ?pos, ?origin_dist); \ trace!( position = ?pos, "x is {} and y is {}", ; 8 if pos.x >= 0.0 { "positive" } else { "negative" }, : 7 if pos.y >= 0.0 { "positive" } else { "negative" } 4 / , trace!(name: "completed", position = ?pos); < < Н &| 8
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% - , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ - , , 8 % , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 % , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 % , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 % * ' Constructs an event at the info level. H = | ! t \ use tracing::info; ; 8 # // this is so the test will still work in no-std mode ԝ # pub struct Ipv4Addr; O L # impl Ipv4Addr { fn new(o1: u8, o2: u8, o3: u8, o4: u8) -> Self { Self } } 1 . # struct Connection { port: u32, speed: f32 } use tracing::field; + ( let addr = Ipv4Addr::new(127, 0, 0, 1); 4 1 let conn = Connection { port: 40, speed: 3.20 }; 0 - info!(conn.port, "connected to {:?}", addr); T info!( $ ! target: "connection_events", ip = ?addr, conn.port, ?conn.speed, 4 C @ info!(name: "completed", "completed connection to {:?}", addr); < < Н &| 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , À 8 4Ā & ʀ , ̀ 8 4̀ $ Ӏ 8 4Հ & ۀ , ݀ 8 4ހ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & ā 8 $Ł $ Ɂ - ˁ , ́ ́ ց , 8 ρ & Ё 8 ,с ׁ , ځ ہ , ܁ 8 ,݁ & 8
* ڂ , 8 , ' 8 , Ԃ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ ӂ - , Ă , 8 Â ł Ƃ , Ȃ ɂ Ђ , ʂ 8 ,˂
т % ۂ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , ǃ ȃ 8 4Ƀ & σ , у 8 4҃ $ 8 4ڃ & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% ݄ 8 4 & , 8 4 & 8 $ $ 8 4 & , Ä 8 4Ą & ʄ 8 $˄ $ τ , ф ҄ ڄ , ӄ 8 Ԅ & ׄ 8 ۄ *߄ ą , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % Ņ 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , Ɔ dž 8
$Ȇ & ̆ , Ά 8
$φ $ ӆ 8 4Ն & ۆ , ݆ 8 4ކ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $Ç $ LJ , ɇ ʇ Ӈ , ˇ 8 ̇ & ͇ 8 ,· ԇ Շ , ׇ ؇ , ه 8 ,ڇ & ߇ 8
* ҈ , 8 , ' 8 , ̈ 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ ˈ , , 8 , Ȉ , 8 ,È
Ɉ % ӈ و 8
$ڈ & ވ , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , É 8
$ĉ $ ȉ 8 4ʉ & Љ , ҉ 8 4Ӊ $ ى , ۉ 8 ,܉ ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% ڊ 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , Ȋ , 8 & 8 ,Ê Ɋ ʊ , ̊ ͊ , Ί 8 ,ϊ & Ԋ 8 Պ
؊ *܊ ߊ ȋ , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% ɋ ϋ 8
$Ћ & ԋ , 8
$ & ۋ 8 $܋ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , 'ƌ 8Ƈ ,Ȍ '͌ 8 $ό $ ӌ Ռ $ , ٌ ڌ ߌ , ی 8 ܌ % 8
$ & , 8
$ & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , 'Í 8 ,ō ʍ ˍ 8
$̍ & Ѝ , ҍ 8
$Ӎ $ , ٍ 8 ,ڍ 'ߍ 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ , , 8 & 8 , , , 8 , & 8
*Ď ǎ , ю 8 ,Ҏ ' 8 ,َ ގ ߎ
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% Տ 8
$ & , 8
$ & 8 $ $ - , Ï , 8 & 8 , ď ŏ , Ǐ ȏ ҏ , ɏ 8 ,ʏ & Ϗ 8 Џ
ӏ * ڏ , 8 , ' 8 ,
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & Ő 8 $Ɛ $ ʐ ̐ , ͐ ΐ א , ϐ 8 А & ѐ 8 ,Ґ ؐ ِ , ې ܐ , ݐ 8 ,ސ & 8
* Ƒ , 8 , ' 8 ,
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% Ǒ ͑
8
$Α & ґ , ԑ 8
$Ց & ّ 8 $ڑ $ ޑ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % Ւ 8 4֒ & ܒ , ޒ 8 4ߒ & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ , 8 , ' 8Ƈ , 'Ǔ 8 $ɓ $ ͓ ϓ ܓ , ѓ ғ ٓ , ӓ 8 ,ԓ
ړ $ ݓ , ߓ , 8
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , Ô Ĕ
8 4Ŕ & ˔ , ͔ 8 4Δ $ Ԕ , ֔ 8 ,ה 'ܔ 8Ƈ ,ޔ ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
*ĕ Ǖ , ѕ 8 ,ҕ 'ו 8 ,ٕ ޕ ߕ
8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% ޖ 8 4 & , 8 4 & 8 $ $ , Ö ̖ , Ė 8 Ŗ & Ɩ 8 ,ǖ ͖ Ζ , Ж і ۖ , Җ 8 ,Ӗ & ؖ 8 ٖ
ܖ * , 8 , ' 8 ,
8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% Ɨ
8 4Ǘ & ͗ , ϗ 8 4З & ֗ 8 $ח $ ۗ , ݗ ޗ , ߗ 8 & 8 * , 8 , ' 8 , 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % ֘ 8 4ט & ݘ , ߘ 8 4 & 8 $ $ , , 8 , & 8 $ , , 8 & 8 * ̚ , 8 , ' 8 , ƚ 8 4 & 8
\ ʙ ˙ ̙ $ ͙ 8 4ۙ & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , $ , , 8 % ͚ Ӛ 8 4Ԛ & ښ , ܚ 8 4ݚ & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ ś ƛ Ǜ $ ț 8 4֛ & ܛ , ޛ 8 4ߛ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & Ȝ , ʜ 8 4˜ & ќ 8 $Ҝ $ ֜ - , ٜ ڜ , ۜ 8 ܜ & ݜ 8 ,ޜ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4ŝ & ˝ , ͝ 8 4Ν $ ԝ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ ƞ Ȟ , ɞ ʞ Ӟ , ˞ 8 ̞ & ͞ 8 ,Ξ Ԟ ՞ מ , ٞ ڞ , ۞ 8 ,ܞ & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ ğ , ҟ 8 ,ӟ '؟ 8Ƈ ,ڟ 'ߟ 8 $ $ , , 8 , , 8 ,
% Ԡ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , à Ġ $ Š , Ǡ Ƞ Ҡ , ɠ 8 ,ʠ & Ϡ 8 Р
Ӡ *֠ ٠ , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , 'ơ 8Ƈ ,ȡ '͡ 8 $ϡ $ ӡ , , 8 $ , , 8 ,
% 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , $ , , 8 , & 8
*â Ƣ , Т 8 ,Ѣ '֢ 8 ,آ ݢ ޢ 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ Σ - У , ѣ ң գ , ӣ 8 ԣ ֣ ף $ أ , ڣ ۣ , ܣ 8 ,ݣ
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , $ , , 8 , & 8
* , 8 , 'Ĥ 8 ,Ƥ ˤ ̤ ܥ 8 4ڤ & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ ҥ , å , 8 ¥ ĥ ť $ ƥ , ȥ ɥ Х , ʥ 8 ,˥
ѥ %
8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ ɦ ʦ ˦ $ ̦ 8 4ڦ & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % ҧ ӧ , է ֧ , ק 8 ,ا & ݧ 8 ާ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ , 8 ,¨ 'Ǩ 8Ƈ ,ɨ 'Ψ 8 $Ш $ Ԩ , , 8 , $ , , 8 % , , 8 & 8 , , , 8 , & 8
* Ъ , ɩ 8 ,ʩ 'ϩ 8 ,ѩ ֩ ש ʪ 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% Ѫ ת - ت , ٪ ڪ , ۪ 8 ܪ & ݪ 8 ,ު , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ , ū 8 ,ƫ '˫ 8Ƈ ,ͫ 'ҫ 8 $ԫ $ ث - , , 8 , , 8 ,
% , , 8 & 8 , , , 8 , & 8
* ʭ , ¬ 8 ,ì 'Ȭ 8 ,ʬ Ϭ Ь ĭ 8 4ެ & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% ˭ ѭ , ҭ ӭ ܭ , ԭ 8 խ & ֭ 8 , ݭ ޭ $ ߭ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ , 8 , 'î 8Ƈ ,Ů 'ʮ 8 $̮ $ Ю ޮ , , 8 $ , , 8 ,
% - , , 8 & 8 , $ , , 8 , & 8
* , 8 , ' 8 , į ů 8 4ӯ & ٯ 8
\ۯ $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 $ , , 8 ,
% Ű ư , ǰ Ȱ Ѱ , ɰ 8 ʰ & ˰ 8 ,̰ Ұ Ӱ $ , ְ װ , ذ 8 ,ٰ & ް 8 ߰
* , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ ű ӱ ձ , ֱ ױ ڱ , ر 8 ٱ ۱ ܱ $ ݱ , ߱ , 8 ,
% - , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
\² Ͳ β ϲ $ в , 8 ,߲ ' 8Ƈ , ' 8 $ $ - , , 8 % , , 8 & 8 , * , 8 , 'ų 8 ,dz ̳ ͳ 8 4۳ & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 % ´ д , ô Ĵ ʹ , Ŵ 8 ƴ & Ǵ 8 ,ȴ δ ϴ *Ҵ մ ڵ , ߴ 8 , ' 8 , Ե 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ ʵ , µ õ Ƶ , ĵ 8 ŵ ǵ ȵ % ۵ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , '¶ 8Ƈ ,Ķ 'ɶ 8 $˶ $ ϶ , ݶ , ߶ 8 % * ' Constructs an event at the warn level. H = | ĸ ! t \ use tracing::warn; й Թ+ ( let warn_description = "Invalid Input"; let input = &[0x27, 0x45]; . + warn!(?input, warning = warn_description); TҺ warn!( ݺ target: "input_events", # warning = warn_description, 2 / "Received warning for input: {:?}", input, 4Ի ۻ# warn!(name: "invalid", ?input); < < Н &| ּ 8
$ & ۼ , ݼ 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , ý 8 ,Ľ 'ɽ 8 ,˽ н ѽ 8
$ҽ & ֽ , ؽ 8
$ٽ $ ݽ 8 4߽ & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , ¾ 8
$þ & Ǿ 8 $Ⱦ $ ̾ 8 4ξ & Ծ , ־ 8 4 & ݾ 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & ǿ , ɿ 8 4ʿ $ п 8 4ҿ & ؿ , ڿ 8 4ۿ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8
$ & , 8
$ & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8
$ & , 8
$ & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8
$ & , 8
$ & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
%
8
$ & , 8
$ & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8
$ & , 8
$ $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8 4 & , 8 4 & 8 $ $ , , 8 , & 8
$ , , 8 & 8
* , 8 , ' 8 , 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 ,
$ , , 8
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 ,
8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
%
8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % 8 4 & , 8 4 & 8 $ $ , , 8 , & 8 $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , $ , , 8 % 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 , , 8 ,
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , $ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 $ , , 8 ,
% 8 4 & , 8 4 & 8 $ $ - , , 8 & 8 , $ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ - , , 8 $ , , 8 ,
% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , $ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 $ , , 8 ,
%
8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 $ $ $ , , 8 % , , 8 , & 8 $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
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% - , , 8 & 8 , , , 8 , & 8
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% , , 8 & 8 , , , 8 , & 8
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% , , 8 & 8 , $ , , 8 , & 8
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% - , , 8 & 8 , $ , , 8 , & 8
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% , , 8 & 8 , $ , , 8 , & 8
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\ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 $ , , 8 ,
% Ā ʀ ـ - ˀ , ̀ ̀ ր , 8 π & Ѐ 8 ,р ׀ *ۀ ހ , 8 , ' 8 , ށ 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ Ɂ ԁ - ˁ , ́ ́ Ё , 8 ρ с ҁ % , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
\ $ , ɂ 8 ,ʂ 'ς 8Ƈ ,т 'ւ 8 $ $ ܂ , , 8 % , , 8 & 8 , * , 8 , ' 8 , 8 4Ń & ˃ 8
\̓ ك ڃ $ ۃ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 % , , 8 & 8 * , Ƅ 8 ,DŽ '̄ 8 ,΄ ӄ Ԅ 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 $ $ , , 8 % ֊ ą+ ( Constructs an event at the error level. H = | 쏇 ! χ tӇ \ use tracing::error; 1 . let (err_info, port) = ("No connection", 22); ҈ ֈ$ ! error!(port, error = %err_info); < 9 error!(target: "app_events", "App Error: {}", err_info); ; 8 error!({ info = err_info }, "error on port: {}", port); A > error!(name: "invalid_input", "Invalid input: {}", err_info); < < Н &|Ɗ 8
$ & , 8
$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & Ƌ 8 $Nj $ ˋ ͋ , ϋ Ћ ڋ , ы 8 ,ҋ & 8 ؋
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$ & , 8
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% ύ 8
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$ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , ̍ , Í 8 ,č & ɍ 8 ʍ
͍ *э ԍ Ύ , ލ 8 ,ߍ ' 8 , Ȏ 8
$ & , 8
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Ŏ % ώ Վ 8
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% 8
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% 8
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$ & , 8
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% 8
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$ݗ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ - , , 8 , , 8 ,
% 8
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ڙ % 8
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$ & , Ú 8
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М $ Ӝ , ՜ ֜ ۜ , ל 8
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* , 8 , ' 8 , 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , 'ß 8 ,ş $ ʟ ̟ - Ο , ϟ П ӟ , џ 8 ҟ ԟ ՟ , ן ؟ ߟ , ٟ 8 ,ڟ
% 8 4 & , 8 4 & 8 $ $ 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
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% 8 4 & , 8 4 & ġ 8 $š $ ɡ 8 4ˡ & ѡ , ӡ 8 4ԡ & ڡ 8 $ۡ $ ߡ , , 8 & 8 * բ , 8 , ' 8 , Ϣ 8 4 & , 8 4 $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ â Ģ $ Ţ , Ǣ Ȣ ͢ , ɢ 8 ʢ % ֢ 8
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$ , , 8
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$ & , 8
$ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 ,¥ $ ǥ ɥ ޥ , ˥ ̥ ϥ , ͥ 8 Υ Х ѥ , ӥ ԥ ۥ , ե 8 ,֥
ܥ % 8
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% 8
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8
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% 8
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8
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8
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$ , , 8 & 8
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$ , , 8
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8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 , , 8 ,
% ߲ 8 4 & , 8 4 & 8 $ $ - ² , ò IJ Ͳ , Ų 8 Ʋ & Dz 8 ,Ȳ β ϲ , Ѳ Ҳ ܲ , Ӳ 8 ,Բ & ٲ 8 ڲ
ݲ * , 8 , ' 8 ,
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8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ ״ ô , Ĵ Ŵ ȴ , ƴ 8 Ǵ ɴ ʴ , ̴ ʹ Դ , δ 8 ,ϴ
մ % ߴ
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\߶ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ Ƿ , ķ , 8 , ŷ $ ȷ , ַ ܷ , ط 8 ٷ ݷ % 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
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\˺ ֺ غ $ ٺ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ - , , 8 , , 8 ,
% λ Ի 8 4ջ & ۻ , ݻ 8 4 & 8 $ $ , , 8 & 8 , , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
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% Ž 8 4ƽ & ̽ , ν 8 4Ͻ & ս 8 $ֽ $ ڽ , ܽ ݽ , 8 ߽ & 8 , $ , , 8 , & 8
* , 8 , ' 8 , 8 4 & 8
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% 8 4 & , 8 4 & ¿ 8 $ÿ $ ǿ - ɿ , ʿ ˿ Կ , ̿ 8 Ϳ & ο 8 ,Ͽ տ ֿ $ , ٿ ڿ , ۿ 8 ,ܿ & 8
* , 8 , ' 8 , 8 4 & 8
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% 8 4 & , 8 4 & 8 $ $ , , 8 & 8 , $ , , 8 , & 8
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%
8 4 & , 8 4 & 8 $ $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ 8 4 & , 8 4 $ , 8 , ' 8Ƈ , ' 8 , $ $ , , 8 % , , 8 , & 8 $ , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 , $ , , 8 % , , 8 & 8 , , , 8 , & 8
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% - , , 8 & 8 , , , 8 , & 8
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% , , 8 & 8 , , , 8 , & 8
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% , , 8 & 8 , $ , , 8 , & 8
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% - , , 8 & 8 , $ , , 8 , & 8
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% , , 8 & 8 , $ , , 8 , & 8
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% - , , 8 & 8 , * , 8 , ' 8 , 8 4 & 8
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\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 % , , 8 & 8 * , 8 , ' 8 , 8 4 & 8
\ $ , 8 , ' 8Ƈ , ' 8 , $ , , 8 % 9 6 Constructs a new static callsite for a span or event. 8 4 t &| 8
$ & , 8
$ & 8 $ $ 8 $ & , 8 $ & 8 $ $ 8+ 4 & , , 8+ 4 & 8
* , 8 , ' 8
D 8
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% 8
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* , 8 , ' 8
D 8
$ & , 8
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% ! 8
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$ & 8 $ $ 8 $ & , 8 $ & 8 $ $ 8 4 & , 8 4 & 8 $ $ 8> , & , 8 & 8 $ $ 8+ 4 & , , 8+ 4 & 8
* ( 8 4 8 $ & , 8 , ' 8> D :7 < , 8 , ' 8 D " 8
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$ $ 8 4 & , 8 4 $ 8> , & , 8 $ 8+ 4 & , 8 , ' 8 D , , 8+ 4
$ 8
D & 8 T $ 8 $ & , 8 $ $ % 8 4 8 T & , 8 , ' 8
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D ' 8 | ' 8 8 $ % 8 T 8 register D % 8 T % 9 ̐ 8 4 t &| 8
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% ! 8
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* 8 4 8 $ & , 8 , ' 8> D :7 < , 8 , ' 8 D " 8
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D & 8 T $ 8 $ & , 8 $ $ % , 8 , ' 8
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else_block T & 8 , * , 8 T % ̾ / , Dispatches trace events to [`Subscriber`]s. 0 4P M The _dispatcher_ is the component of the tracing system which is responsible N K for forwarding trace data from the instrumentation points that generate it ' $ to the subscriber that collects it. # Using the Trace Dispatcher N K Every thread in a program using `tracing` has a _default subscriber_. When K H events occur, or spans are created, they are dispatched to the thread's current subscriber. % " ## Setting the Default Subscriber K H By default, the current subscriber is an empty implementation that does O L nothing. To use a subscriber implementation, it must be set as the default. < 9 There are two methods for doing so: [`with_default`] and N K [`set_global_default`]. `with_default` sets the default subscriber for the M J duration of a scope, while `set_global_default` sets a default subscriber for the entire process. L I To use either of these functions, we must first wrap our subscriber in a I F [`Dispatch`], a cloneable, type-erased reference to a subscriber. For d example: \ # use tracing_core::{ $ ! # dispatcher, Event, Metadata, & # # span::{Attributes, Id, Record} D 7 4 # impl tracing_core::Subscriber for FooSubscriber {
D
/ % " # fn event(&self, _: &Event) {} 8 9 " ! < ? < # impl FooSubscriber { fn new() -> Self { FooSubscriber } }
use dispatcher::Dispatch;
-
3 0 let my_dispatch = Dispatch::new(my_subscriber); <Н N K Then, we can use [`with_default`] to set our `Dispatch` as the default for the duration of a block: \ $ & D 7 D / % 8 9 " ! < ? / , # let my_subscriber = FooSubscriber::new(); A > # let my_dispatch = dispatcher::Dispatch::new(my_subscriber); // no default subscriber / , dispatcher::with_default(&my_dispatch, || { ' $ // my_subscriber is the default < " // no default subscriber again <Н M J It's important to note that `with_default` will not propagate the current P M thread's default subscriber to any threads spawned within the `with_default` I F block. To propagate the default subscriber to new threads, either use D A `with_default` from the new thread, or use `set_global_default`. M J As an alternative to `with_default`, we can use [`set_global_default`] to L I set a `Dispatch` as the default for all threads, for the lifetime of the ̡ program. For example: \ $ & D 7 D / % 8 9 " ! < ? / A Ӏ / , dispatcher::set_global_default(my_dispatch) J G // `set_global_default` will return an error if the global default !+ ( // subscriber has already been set. !3 0 .expect("global default was already set!"); " ") & // `my_subscriber` is now the default <"Н " "Aλ #Y V Note: The thread-local scoped dispatcher (with_default) #H E requires the Rust standard library. no_std users should $P M use set_global_default d% instead. T% % %' $ ## Accessing the Default Subscriber % %C @ A thread's current default subscriber can be accessed using the &N K [`get_default`] function, which executes a closure with a reference to the &E B currently default `Dispatch`. This is used primarily by `tracing` ' instrumentation. ' '% " [`Subscriber`]: crate::Subscriber TԾ \( 2d) 3d* 4ʹ \* 6+ 7OD+ 8+ 9 WeakDispatchd+ : has_been_setd- ;(%)&*&*q|~npUW-&Al & # `Span` and `Event` key-value data. ' +S P Spans and events may be annotated with key-value data, referred to as _fields_. B ? These fields consist of a mapping from a key (corresponding to J G a `&str` but represented internally as an array index) to a [`Value`]. # `Value`s and `Subscriber`s O L `Subscriber`s consume `Value`s as fields attached to [span]s or [`Event`]s. R O The set of field keys on a given span or event is defined on its [`Metadata`]. L I When a span is created, it provides [`Attributes`] to the `Subscriber`'s N K [`new_span`] method, containing any fields whose values were provided when K H the span was created; and may call the `Subscriber`'s [`record`] method K H with additional [`Record`]s if values are added for more of its fields. M J Similarly, the [`Event`] type passed to the subscriber's [`event`] method 3 0 will contain any fields attached to each event. I F `tracing` represents values as either one of a set of Rust primitives J G (`i64`, `u64`, `f64`, `bool`, and `&str`) or using a `fmt::Display` or K H `fmt::Debug` implementation. `Subscriber`s are provided these primitive - * value types as `dyn Value` trait objects. L I These trait objects can be formatted using `fmt::Debug`, but may also be K H recorded as typed data by calling the [`Value::record`] method on these
O L trait objects with a _visitor_ implementing the [`Visit`] trait. This trait P M represents the behavior used to record values of various types. For example, O L an implementation of `Visit` might record integers by incrementing counters 4 1 for their field names rather than printing them. # Using `valuable`
U R `tracing`'s [`Value`] trait is intentionally minimalist: it supports only a small
I F number of Rust primitives as typed values, and only permits recording D A user-defined types with their [`fmt::Debug`] or [`fmt::Display`] S P implementations. However, there are some cases where it may be useful to record O L nested values (such as arrays, `Vec`s, or `HashMap`s containing values), or K H user-defined `struct` and `enum` types without having to format them as unstructured text. O L To address `Value`'s limitations, `tracing` offers experimental support for O L the [`valuable`] crate, which provides object-safe inspection of structured N K values. User-defined types can implement the [`valuable::Valuable`] trait, N K and be recorded as a `tracing` field by calling their [`as_value`] method. D A If the [`Subscriber`] also supports the `valuable` crate, it can H E then visit those types fields as structured values using `valuable`. Aλ B ? Note: valuable support is an M J unstable feature. See O L the documentation on unstable features for details on how to enable it. T l ' $ // Derive `Valuable` for our types: use valuable::Valuable; % " #[derive(Clone, Debug, Valuable)] struct User { name: String, age: u32, address: Address, , % struct Address { Ġ country: String, city: String, street: String, , + ( name: "Arwen Undomiel".to_string(), age: 3000, address: Address { 0 - country: "Middle Earth".to_string(), * ' city: "Rivendell".to_string(), - * street: "leafy lane".to_string(), T }, 4 R O // Recording `user` as a `valuable::Value` will allow the `tracing` subscriber ; 8 // to traverse its fields as a nested, typed structure: 3 0 tracing::info!(current_user = user.as_value()); < Н L I Alternatively, the [`valuable()`] function may be used to convert a type ; 8 implementing [`Valuable`] into a `tracing` field value. O L When the `valuable` feature is enabled, the [`Visit`] trait will include an J G optional [`record_value`] method. `Visit` implementations that wish to L I record `valuable` values can implement this method with custom behavior. P M If a visitor does not implement `record_value`, the [`valuable::Value`] will !: 7 be forwarded to the visitor's [`record_debug`] method. ! !# !% " [`fmt::Display`]: std::fmt::Debug "3 "X U [`valuable::Valuable`]: https://docs.rs/valuable/latest/valuable/trait.Valuable.html #` ] [`as_value`]: https://docs.rs/valuable/latest/valuable/trait.Valuable.html#tymethod.as_value $Q N [`valuable::Value`]: https://docs.rs/valuable/latest/valuable/enum.Value.html $%͐ %) & [`record_value`]: Visit::record_value %) & [`record_debug`]: Visit::record_debug % [span]: mod@crate::span %" [`Event`]: crate::event::Event &! &+ ( [`Attributes`]: crate::span::Attributes &# [`Record`]: crate::span::Record '- * [`new_span`]: crate::Subscriber::new_span ') & [`record`]: crate::Subscriber::record '' $ [`event`]: crate::Subscriber::event , ?>D( < > =7E1 =E3 = Visit-T ==m =-o =*-+ = Empty-. = = Iter%7 = DisplayValueek =
DebugValueUl =(|(-( (@ = Trait implemented to allow a type to be used as a field key. ) )Aλ )D A Note: Although this is implemented for both the *N K Field type and any *N K type that can be borrowed as an &str, only Field + allows O(1) access. +O L Indexing a field with a string results in an iterative search that performs ,P M string comparisons. Thus, if possible, once the key for a field is known, it ,% " should be used whenever possible. T- <- ? ? L - L - ? ( 4 )@@ @ /= -M J Attempts to convert `&self` into a `Field` with the specified `metadata`. . .L I If `metadata` defines this field, then the field is returned. Otherwise, . this returns `None`.D/ L >
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F $4q%4$ + 5% 8 , 5" - * Attach a span to a `std::future::Future`. T Y\ $ 1 J MOD$ J N 8$$9 J O4Z J Q,n J RMd~ J S} J T|< ~ J V$ J W pin_project\ J X<TT3FptRlfyDqsbdK܂ 0 - Attaches spans to a [`std::future::Future`]. * ' Extension trait allowing futures to be ) & instrumented with a `tracing` [span]. [span]: super::Span T Y Y L , Y Z[Z[ [ Z 5 B ? Instruments this type with the provided [`Span`], returning an `Instrumented` wrapper. G D The attached [`Span`] will be [entered] every time the instrumented ( % [`Future`] is polled or [`Drop`]ped. t ܯ Instrumenting a future: \ use tracing::Instrument; # async fn doc() { ܫ let my_future = async { t 4 l
my_future 5 2 .instrument(tracing::info_span!("my_future")) t .await < <Н G D The [`Span::or_current`] combinator can be used in combination with E B `instrument` to ensure that the [current span] is attached to the < 9 future if the span passed to `instrument` is [disabled]: < Н # mod tokio {
= : # pub(super) fn spawn(_: impl std::future::Future) {} <
t 4 < 9 let outer_span = tracing::info_span!("outer").entered(); E B // If the "my_future" span is enabled, then the spawned task will A > // be within both "my_future" *and* "outer", since "outer" is
A > // "my_future"'s parent. However, if "my_future" is disabled,
2 / // the spawned task will *not* be in any span. tokio::spawn( my_future : 7 .instrument(tracing::debug_span!("my_future")) 4 H E // Using `Span::or_current` ensures the spawned task is instrumented G D // with the current span, if the new span passed to `instrument` is I F // not enabled. This means that if the "my_future" span is disabled, I F // the spawned task will still be instrumented with the "outer" span: # let my_future = async {};
my_future G D .instrument(tracing::debug_span!("my_future").or_current()) 4 <Н # [entered]: super::Span::enter() 3 0 [`Span::or_current`]: super::Span::or_current() * ' [current span]: super::Span::current() * ' [disabled]: super::Span::is_disabled() # [`Future`]: std::future::FutureT L/M Y Y O&& . C @ Instruments this type with the [current] [`Span`], returning an G ( N K This can be used to propagate the current span when spawning a new future. t \ = < . + let span = tracing::info_span!("my_span"); Tԉ č let future = async { B ? tracing::debug!("this event will occur inside `my_span`"); t 4 + ( tokio::spawn(future.in_current_span()); < < Н % " [current]: super::Span::current() # ̱ [`Span`]: crate::Span #| LM Y Y
[L' < 9 Extension trait allowing futures to be instrumented with 2 / a `tracing` [`Subscriber`](crate::Subscriber). t \ \ , \ ]_]_ ] _ ,e B ? Attaches the provided [`Subscriber`] to this type, returning a [`WithDispatch`] wrapper. ! !N K The attached [`Subscriber`] will be set as the [default] when the returned ! [`Future`] is polled. " t" " <"Н "< 9 # use tracing::subscriber::NoSubscriber as MySubscriber; "A > # use tracing::subscriber::NoSubscriber as MyOtherSubscriber; # # async fn docs() { #, ) use tracing::instrument::WithSubscriber; $ $# // Set the default `Subscriber` $M J let _default = tracing::subscriber::set_default(MySubscriber::default()); % %N K tracing::info!("this event will be recorded by the default `Subscriber`"); % %A > // Create a different `Subscriber` and attach it to a future. &8 5 let other_subscriber = MyOtherSubscriber::default(); & 'P M tracing::info!("this event will be recorded by the other `Subscriber`"); t' 4' ( T( future (I F // Attach the other `Subscriber` to the future before awaiting it (* ' .with_subscriber(other_subscriber) |) .await; ) )L I // Once the future has completed, we return to the default `Subscriber`. *N <* <*Н * *% " [`Subscriber`]: super::Subscriber +8 5 [default]: dispatcher#setting-the-default-subscriber +#|, LPQ \
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]LP((-/ :6 -K H Attaches the current [default] [`Subscriber`] to this type, returning a . . .L I The attached `Subscriber` will be set as the [default] when the returned ̴/ / /E B This can be used to propagate the current dispatcher context when 0= : spawning a new future that may run on a different thread. 0 t0 1 <1Н 1 1= <1 1< 2 2, 3 3F C // Using `set_default` (rather than `set_global_default`) sets the 33 0 // default `Subscriber` for *this* thread only. 4M 4 4 t5 45 5 5I F // If a multi-threaded async runtime is in use, this spawned task may 5P M // run on a different thread, in a different default `Subscriber`'s context. 6 tokio::spawn(future); 6 6F C // However, calling `with_current_subscriber` on the future before 7M J // spawning it, ensures that the current thread's default `Subscriber` is 8G D // propagated to the spawned task, regardless of where it executes: 8 # let future = async { }; 93 0 tokio::spawn(future.with_current_subscriber()); <9 <9Н 9% 98 :#: LQ \ \
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n-]ɽB^V p p ,W- V W r r W.stuvwxy W W9 6 Borrows the `Span` that this type is instrumented by.$W . / q X q
s-$XX' XA > Mutably borrows the `Span` that this type is instrumented by.DY . / q Y q
t-$YY Y Borrows the wrapped type.,Y . - q Y q
u-$YZ% Z% " Mutably borrows the wrapped type.LZ . - q Z q
v-$Z[1 [/ , Get a pinned reference to the wrapped type.l[ } U $ '$|c.6 . } U $ '$|c.6 - q [ q
w-c\9 \7 4 Get a pinned mutable reference to the wrapped type.l] } U $ '$|c.6 . } U $ '$|c.6 - q ] q
x-f^ ]< 9 Consumes the `Instrumented`, returning the wrapped type. ^ ^" Note that this drops the span.T^ .- q q
y-id* d d d 8 ; // Perform some work inside of the context of `my_span`... 6 3 // Dropping the `_enter` guard will exit the span. 4 ~ T Q Warning: In asynchronous code that uses async/await syntax, R O Span::enter may produce incorrect traces if the returned drop 0 - guard is held across an await point. See T Q the method documentation for details. ¥ M J The [`entered`] method is analogous to [`enter`], but moves the span into J G the returned guard, rather than borrowing it. This allows creating and + ( entering a span in a single expression: < Н ! 5 2 // Create a span and enter it, returning a guard: 7 4 let span = span!(Level::INFO, "my_span").entered(); H E // We are now inside the span! Like `enter()`, the guard returned by ; 8 // `entered()` will exit the span when it is dropped... E B // ...but, it can also be exited explicitly, returning the `Span` t // struct: ܸ let span = span.exit(); < Н M J Finally, [`in_scope`] takes a closure or function pointer and executes it inside the span: < Н ! !C @ let my_span = span!(Level::TRACE, "my_span", my_var = &my_var); ! ! my_span.in_scope(|| { !; 8 // perform some work in the context of `my_span`... <" " "? < // Perform some work outside of the context of `my_span`... " " #> ; // Perform some more work in the context of `my_span`. <# <#Н # #Aλ $R O Note: Since entering a span takes &self, and $I F Spans are Clone, Send, and %Q N Sync, it is entirely valid for multiple threads to enter the & same span concurrently. T& & & ## Span Relationships & &N K Spans form a tree structure — unless it is a root span, all spans have a 'N K _parent_, and may have one or more _children_. When a new span is created, (O L the current span becomes the new span's parent. The total execution time of (L I a span consists of the time spent in that span and in the entire subtree )N K represented by its children. Thus, a parent span always lasts for at least )9 6 as long as the longest-executing span in its subtree. * <*Н *! # use tracing::{Level, span}; *> ; // this span is considered the "root" of a new trace tree: +, ) span!(Level::INFO, "root").in_scope(|| { +J G // since we are now inside "root", this span is considered a child , // of "root": ,8 5 span!(Level::DEBUG, "outer_child").in_scope(|| { ,H E // this span is a child of "outer_child", which is in turn a - // child of "root": -< 9 span!(Level::TRACE, "inner_child").in_scope(|| { . // and so on... |. }); \. }); .E B // another span created here would also be a child of "root". as separate durations. > > ## Closing Spans > >J G Execution may enter and exit a span multiple times before that span is ?E B _closed_. Consider, for example, a future which has an associated ?6 3 span and enters that span every time it is polled: \@ @ # use std::future::Future; @% " # use std::task::{Context, Poll}; ĆA # use std::pin::Pin; A struct MyFuture { tA // data A span: tracing::Span, ,A A A impl Future for MyFuture { ̉B type Output = (); B BT Q fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll { B+ ( let _enter = self.span.enter(); C' $ // Do actual future work... C # Poll::Ready(()) LC ,C Subscriber::exit(my_span) O ON K // The handle to `my_span` only lives inside of this block; when it is PD A // dropped, the subscriber will be informed via `drop_span`. Q Q+ ( } // --> Subscriber::drop_span(my_span) let span = span!(Level::TRACE, "my_loop", iteration = i); ]" let _enter = span.enter(); t^ ,^ <^Н ^ ^L I Depending on the circumstances, we might want to do either, or both. For ^P M example, if we want to know how long was spent in the loop overall, we would _Q N create a single span around the entire loop; whereas if we wanted to know how `O L much time was spent in each individual iteration, we would enter a new span ` on every iteration. ` ԁa [fields]: super::field a [Metadata]: super::Metadata a# [verbosity level]: super::Level a+ ( [`Poll::Ready`]: std::task::Poll::Ready ܌b [`span!`]: super::span! b' $ [`trace_span!`]: super::trace_span! b' $ [`debug_span!`]: super::debug_span! b% " [`info_span!`]: super::info_span! c% " [`warn_span!`]: super::warn_span! c' $ [`error_span!`]: super::error_span! c? < [`clone_span`]: super::subscriber::Subscriber::clone_span() d= : [`drop_span`]: super::subscriber::Subscriber::drop_span() d1 . [`exit`]: super::subscriber::Subscriber::exit e1 . [`Subscriber`]: super::subscriber::Subscriber e [`enter`]: Span::enter() e [`entered`]: Span::entered() f" [`in_scope`]: Span::in_scope() f* ' [`follows_from`]: Span::follows_from() f [guard]: Entered f! [parent]: #span-relationships $п րTg 1g Record4g $g 1 ODg 8,g < >Dh h h ] $h b b 4h b ]\h ] mem h ,h g,UXIL7:gA2Tg%(hc
h{}Thni% h6 3 Trait implemented by types which have a span `Id`. $i i i " . * j iI F Returns the `Id` of the span that `self` corresponds to, or `None` if j( % this corresponds to a disabled span.,j L 92g 2 j
L$jL / ݄R @ = Constructs a new `Span` with the given [metadata] and set of [field values]. L I The new span will be constructed by the currently-active [`Subscriber`], ݁8 5 with the current span as its parent (if one exists). I F After the span is constructed, [field values] and/or [`follows_from`] # annotations may be added to it. [metadata]: super::Metadata ă1 * ' [field values]: super::field::ValueSet / , [`follows_from`]: super::Span::follows_from >
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;ȁEW G D Constructs a new `Span` as the root of its own trace tree, with the / , given [metadata] and set of [field values]. I # ܊* /DƋ + uϷ@ /
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ȁ57 = = : Constructs a new disabled span with the given `Metadata`. I F This should be used when a span is constructed from a known callsite, 5 2 but the subscriber indicates that it is disabled. L I Entering, exiting, and recording values on this span will not notify the K H `Subscriber` but _may_ record log messages if the `log` feature flag is dۛ enabled.d /
ܺ 8 5 Constructs a new span that is *completely disabled*. ڝ J G This can be used rather than `Option` to represent cases where a ı span is not present. Ξ ֞I F Entering, exiting, and recording values on this span will do nothing.$ǟ /
ܣ K H Returns a handle to the span [considered by the `Subscriber`] to be the current span. K H If the subscriber indicates that it does not track the current span, or G D that the thread from which this function is called is not currently 6 3 inside a span, the returned span will be disabled. % " [considered by the `Subscriber`]: 3 0 super::subscriber::Subscriber::current_span< / OT ċ SȆ:L ր 4͊_ P / ٧
$݁DħȁD" ƭM J Enters this span, returning a guard that will exit the span when dropped. N K If this span is enabled by the current subscriber, then this function will M J call [`Subscriber::enter`] with the span's [`Id`], and dropping the guard ůF C will call [`Subscriber::exit`]. If the span is disabled, this does d nothing. ԩ # In Asynchronous Code Ȱ аM J **Warning**: in asynchronous code that uses [async/await syntax][syntax], L I `Span::enter` should be used very carefully or avoided entirely. Holding H E the drop guard returned by `Span::enter` across `.await` points will , ) result in incorrect traces. For example, <Н 셳 - * # async fn some_other_async_function() {} ٳ" async fn my_async_function() { 3 0 let span = info_span!("my_async_function"); < 9 // WARNING: This span will remain entered until this // guard is dropped... " ˵< 9 // ...but the `await` keyword may yield, causing the @ = // runtime to switch to another task, while remaining in Ѷ // this span! ) & some_other_async_function().await t , <Н ʷ ҷF C The drop guard returned by `Span::enter` exits the span when it is H E dropped. When an async function or async block yields at an `.await` F C point, the current scope is _exited_, but values in that scope are C @ **not** dropped (because the async block will eventually resume I F execution from that await point). This means that _another_ task will ˺J G begin executing while _remaining_ in the entered span. This results in an incorrect trace. C @ Instead of using `Span::enter` in asynchronous code, prefer the t following: G D * To enter a span for a synchronous section of code within an async L I block or function, prefer [`Span::in_scope`]. Since `in_scope` takes a J G synchronous closure and exits the span when the closure returns, the J G span will always be exited before the next await point. For example: Lܾ # use tracing::info_span; 4 1 # async fn some_other_async_function(_: ()) {} ǿ$ ! async fn my_async_function() { 5 2 let span = info_span!("my_async_function"); - * let some_value = span.in_scope(|| { = : // run some synchronous code inside the span... l
}); K H // This is okay! The span has already been exited before we reach // the await point. 6 3 some_other_async_function(some_value).await;
// ... < } L A > * For instrumenting asynchronous code, `tracing` provides the 7 4 [`Future::instrument` combinator][instrument] for G D attaching a span to a future (async function or block). This will L I enter the span _every_ time the future is polled, and exit it whenever the future yields. L I `Instrument` can be used with an async block inside an async function: | ```ignore use tracing::Instrument; / , # async fn some_other_async_function() {} $ 5 async move { K H // This is correct! If we yield here, the span will be exited, . + // and re-entered when we resume. / , some_other_async_function().await; 8 5 //more asynchronous code inside the span... \ } : 7 // instrument the async block with the span... .instrument(span) // ...and await it. .await < L G D It can also be used to instrument calls to async functions at the | callsite: | # use tracing::debug_span; / $ 6 3 let some_value = some_other_async_function() B ? .instrument(debug_span!("some_other_async_function")) .await; < L L I * The [`#[instrument]` attribute macro][attr] can automatically generate 2 / correct code when used on an async function: | / , ) #[tracing::instrument(level = "info")] $ H E // This is correct! If we yield here, the span will be exited, + ( // and re-entered when we resume. , ) some_other_async_function().await; < L b _ [syntax]: https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html ( % [`Span::in_scope`]: Span::in_scope() # [instrument]: crate::Instrument # [attr]: macro@crate::instrument t <Н ! - let guard = span.enter(); # // code here is within the span
drop(guard); - * // code here is no longer within the span <Н * ' Guards need not be explicitly dropped: <Н # use tracing::trace_span; fn my_function() -> String { : 7 // enter a span for the duration of this function. . + let span = trace_span!("my_function"); " N K // anything happening in functions we call is still inside the span... my_other_function(); I F // returning from the function drops the guard, exiting the span. ( % return "Hello world".to_owned(); , fn my_other_function() { t , <Н I F Sub-scopes may be created to limit the duration for which the span is d entered: <Н % " # use tracing::{info, info_span}; + ( let span = info_span!("my_great_span"); , " - * // this event occurs inside the span. " info!("i'm in the span!"); ? < // exiting the scope drops the guard, exiting the span. , ) & // this event is not inside the span. " info!("i'm outside the span!") <Н A > [`Subscriber::enter`]: super::subscriber::Subscriber::enter() ? < [`Subscriber::exit`]: super::subscriber::Subscriber::exit() [`Id`]: super::Id, / $ ib
$# I F Enters this span, consuming it and returning a [guard][`EnteredSpan`] ) & that will exit the span when dropped. G T T Q Span::entered may produce incorrect traces if the returned drop T Q guard is held across an await point. See the ? < Span::enter documentation for details. T N M F d K H This is similar to the [`Span::enter`] method, except that it moves the D A span by value into the returned guard, rather than borrowing it. F C Therefore, this method can be used to create and enter a span in a F C single expression, without requiring a `let`-binding. For example: <Н > ; let _span = info_span!("something_interesting").entered(); <Н
rather than: <Н 3 0 let span = info_span!("something_interesting"); let _e = span.enter(); <Н K H Furthermore, `entered` may be used when the span must be stored in some D A other struct or be passed to a function while remaining entered. Aλ Q N Note: The returned P M EnteredSpan guard does not implement Send. Q N Dropping the guard will exit this span, and if the guard is sent O L to another thread and dropped there, that thread may never have entered V S this span. Thus, EnteredSpans should not be sent between threads. T b t E B The returned guard can be [explicitly exited][EnteredSpan::exit], " returning the un-entered span: <Н ! ? < let span = span!(Level::INFO, "doing_something").entered(); # - * // explicitly exit the span, returning it ܋ - // enter the span again let span = span.entered(); , ) // now we are inside the span once again <Н *ߖ <Н ӗ : 8 5 let span = trace_span!("my_function").entered(); N I ( , t , <Н K H Since the [`EnteredSpan`] guard can dereference to the [`Span`] itself, > ; the span may still be accessed while entered. For example: \ 쒁 Ё 9 6 // create the span with an empty field, and enter it. J G let span = info_span!("my_span", some_field = field::Empty).entered(); K H // we can still record a value for the field while the span is entered. / , span.record("some_field", &"hello world!"); <Н A ˄? <ƅ /1
I L I Returns this span, if it was [enabled] by the current [`Subscriber`], or M J the [current span] (whose lexical distance may be further than expected), if this span [is disabled]. J G This method can be useful when propagating spans to spawned threads or * ' [async tasks]. Consider the following: <Н ʉ? < let _parent_span = tracing::info_span!("parent").entered(); Tԉ 3 0 let child_span = tracing::debug_span!("child"); std::thread::spawn(move || { , ) let _entered = child_span.entered(); Ë ˋ, ) tracing::info!("spawned a thread!"); t < <Н H E If the current [`Subscriber`] enables the [`DEBUG`] level, then both K H the "parent" and "child" spans will be enabled. Thus, when the "spawned ԍK H a thread!" event occurs, it will be inside of the "child" span. Because I F "parent" is the parent of "child", the event will _also_ be inside of l
"parent". O L However, if the [`Subscriber`] only enables the [`INFO`] level, the "child" : 7 span will be disabled. When the thread is spawned, the E B `child_span.entered()` call will do nothing, since "child" is not J G enabled. In this case, the "spawned a thread!" event occurs outside of J G *any* span, since the "child" span was responsible for propagating its ! parent to the spawned thread. J G If this is not the desired behavior, `Span::or_current` can be used to J G ensure that the "parent" span is propagated in both cases, either as a ӓ1 . parent of "child" _or_ directly. For example: <Н ? Tԉ J G // If DEBUG is enabled, then "child" will be enabled, and `or_current` ϕK H // returns "child". Otherwise, if DEBUG is not enabled, "child" will be 3 0 // disabled, and `or_current` returns "parent". ז@ = let child_span = tracing::debug_span!("child").or_current(); ɗ, , t <Θ <ژН K H When spawning [asynchronous tasks][async tasks], `Span::or_current` can : 7 be used similarly, in combination with [`instrument`]: <Н 䑚 d # // lol Ú ٚ= < ? Tԉ 3 ʜ Ҝ | async { . + tracing::info!("spawned a task!"); // ... Ν ֝- * }.instrument(child_span.or_current()) 4 <Н @ = In general, `or_current` should be preferred over nesting an H E [`instrument`] call inside of an [`in_current_span`] call, as using ( % `or_current` will be more efficient. <Н d = < 䐡 async fn my_async_fn() { t ,ġ Ρ ֡? | // Do this: ̢L I my_async_fn().instrument(tracing::debug_span!("child").or_current()) 4 ܰ // ...rather than this: У my_async_fn() 6 3 .instrument(tracing::debug_span!("child")) .in_current_span() 4ޤ <Н ) %͐ ե! [current span]: Span::current $ ! [is disabled]: Span::is_disabled [`INFO`]: crate::Level::INFO ɦ" [`DEBUG`]: crate::Level::DEBUG [async tasks]: std::task = : [`instrument`]: crate::instrument::Instrument::instrument ӧG D [`in_current_span`]: crate::instrument::Instrument::in_current_spanT //
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$6 < 9 Executes the given function in the context of this span. L I If this span is enabled, then this function enters the span, invokes `f` G D and then exits the span. If the span is disabled, `f` will still be ݲL I invoked, but in the context of the currently-executing span (if there is L one). ij) & Returns the result of evaluating `f`. t <Н ( % # use tracing::{trace, span, Level}; δ1 . let my_span = span!(Level::TRACE, "my_span"); ̌ - * // this event occurs within the span. ܵ# trace!("i'm in the span!"); < * ' // this event occurs outside the span. Ƕ# trace!("i'm not in the span!"); <Н 0 - Calling a function and returning the result: <Н ķ& # # use tracing::{info_span, Level}; fn hello_world() -> String { ! "Hello world!".to_owned() , ĸ ̸) & let span = info_span!("hello_world"); ? < // the span will be entered for the duration of the call to // `hello_world`. ع. + let a_string = span.in_scope(hello_world); D / - : l : -
-$~SU WY R C @ Returns a [`Field`][super::field::Field] for the field with the λ given `name`, if one exists,, / > ? t
$-/ 4 ċ F 9 6 Returns true if this `Span` has a field for the given Ͻ1 . [`Field`][super::field::Field] or field name.L / t
$n&( ~ F C Records that the field described by `field` has the value `value`. ֿ I F This may be used with [`field::Empty`] to declare fields whose values B ? are not known when the span is created, and record them later: <Н % S " X Tԉ / = : // (note that the field name is passed as a string slice) - * span.record("parting", "goodbye world!"); <Н J G However, it may also be used to record a _new_ value for a field whose value was already recorded: <Н 5 2 # fn do_something() -> Result<(), ()> { Err(()) } P M // Initially, let's assume that our attempt to do something is going okay... = : let span = info_span!("doing_something", is_okay = true); match do_something() { Ԟ Ok(something) => { L Err(_) => { ) & // Things are no longer okay! * ' span.record("is_okay", false); L , <Н Aλ I F Note: The fields associated with a span are part K H of its Metadata. G D The Metadata L I describing a particular span is constructed statically when the span M J is created and cannot be extended later to add new fields. Therefore, M J you cannot record a value for a field that was not specified when the ̨ span was created: T <Н % S " X Tԉ Q N // Now, you try to record a value for a new field, `new_field`, which was not @ = // declared as `Empty` or populated when you created `span`. G D // You won't get any error, but the assignment will have no effect! B ? span.record("new_field", "interesting_value_you_really_need"); ` ] // Instead, all fields that may be recorded after span creation should be declared up front, M J // using field::Empty when a value is not known, as we did for `parting`. Y V // This `record` call will indeed replace field::Empty with "you will be remembered". 5 2 span.record("parting", "you will be remembered"); <Н ; 8 Aλ k h **Note**: To record several values in just one call, see the [`record_all!`](crate::record_all!) macro. ¥ ) & [`field::Empty`]: super::field::Empty ! [`Metadata`]: super::Metadata4 / t d
$/<TV OQ ? 6 3 Records all the fields in the provided `ValueSet`. 8 4 tT / + uϷ@ $4! K H Returns `true` if this span was disabled by the subscriber and does not T exist. ̊ See also [`is_none`]. [`is_none`]: Span::is_none()\ /
$ H E Returns `true` if this span was constructed by [`Span::none`] and is T empty. K H If `is_none` returns `true` for a given span, then [`is_disabled`] will J G also return `true`. However, when a span is disabled by the subscriber D A rather than constructed by `Span::none`, this method will return 4 1 `false`, while `is_disabled` will return `true`. [`Span::none`]: Span::none() ( % [`is_disabled`]: Span::is_disabled()< /
$@ D A Indicates that the span with the given ID has an indirect causal relationship with this span. L I This relationship differs somewhat from the parent-child relationship: a J G span may have any number of prior spans, rather than a single one; and G D spans are not considered to be executing _inside_ of the spans they J G follow from. This means that a span may close even if subsequent spans B ? that follow from it are still open, and time spent inside of a J G subsequent span should not be included in the time its precedents were H E executing. This is used to model causal relationships such as when a E B single future spawns several related background tasks, et cetera. H E If this span is disabled, or the resulting follows-from relationship 4 1 would be invalid, this function will do nothing. t 8 5 Setting a `follows_from` relationship with a `Span`: <Н + ( # use tracing::{span, Id, Level, Span}; - * let span1 = span!(Level::INFO, "span_1"); . + let span2 = span!(Level::DEBUG, "span_2"); span2.follows_from(span1); <Н @ = Setting a `follows_from` relationship with the current span: <Н + , ) let span = span!(Level::INFO, "hello!"); ' $ span.follows_from(Span::current()); <Н B ? Setting a `follows_from` relationship with a `Span` reference: <Н + , let curr = Span::current(); span.follows_from(&curr); <Н 7 4 Setting a `follows_from` relationship with an `Id`: <Н + , let id = span.id(); span.follows_from(id); <Нd /
$&( / , Returns this span's `Id`, if it is enabled. / 2
$< 5 2 Returns this span's `Metadata`, if it is enabled.D / 92g
$T I F Invokes a function with a reference to this span's ID and subscriber. Y V if this span is enabled, the provided function is called, and the result is returned. W T If the span is disabled, the function is not called, and this method returns `None` d| / " 2 P 쭋 - ɋ
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