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| </pre><pre class="rust"><code><span class="doccomment">//! Trace verbosity level filtering. |
| //! |
| //! # Compile time filters |
| //! |
| //! Trace verbosity levels can be statically disabled at compile time via Cargo |
| //! features, similar to the [`log` crate]. Trace instrumentation at disabled |
| //! levels will be skipped and will not even be present in the resulting binary |
| //! unless the verbosity level is specified dynamically. This level is |
| //! configured separately for release and debug builds. The features are: |
| //! |
| //! * `max_level_off` |
| //! * `max_level_error` |
| //! * `max_level_warn` |
| //! * `max_level_info` |
| //! * `max_level_debug` |
| //! * `max_level_trace` |
| //! * `release_max_level_off` |
| //! * `release_max_level_error` |
| //! * `release_max_level_warn` |
| //! * `release_max_level_info` |
| //! * `release_max_level_debug` |
| //! * `release_max_level_trace` |
| //! |
| //! These features control the value of the `STATIC_MAX_LEVEL` constant. The |
| //! instrumentation macros macros check this value before recording an event or |
| //! constructing a span. By default, no levels are disabled. |
| //! |
| //! For example, a crate can disable trace level instrumentation in debug builds |
| //! and trace, debug, and info level instrumentation in release builds with the |
| //! following configuration: |
| //! |
| //! ```toml |
| //! [dependencies] |
| //! tracing = { version = "0.1", features = ["max_level_debug", "release_max_level_warn"] } |
| //! ``` |
| //! ## Notes |
| //! |
| //! Please note that `tracing`'s static max level features do *not* control the |
| //! [`log`] records that may be emitted when [`tracing`'s "log" feature flag][f] is |
| //! enabled. This is to allow `tracing` to be disabled entirely at compile time |
| //! while still emitting `log` records --- such as when a library using |
| //! `tracing` is used by an application using `log` that doesn't want to |
| //! generate any `tracing`-related code, but does want to collect `log` records. |
| //! |
| //! This means that if the "log" feature is in use, some code may be generated |
| //! for `log` records emitted by disabled `tracing` events. If this is not |
| //! desirable, `log` records may be disabled separately using [`log`'s static |
| //! max level features][`log` crate]. |
| //! |
| //! [`log`]: https://docs.rs/log/ |
| //! [`log` crate]: https://docs.rs/log/latest/log/#compile-time-filters |
| //! [f]: https://docs.rs/tracing/latest/tracing/#emitting-log-records |
| </span><span class="kw">pub use </span>tracing_core::{metadata::ParseLevelFilterError, LevelFilter}; |
| |
| <span class="doccomment">/// The statically configured maximum trace level. |
| /// |
| /// See the [module-level documentation] for information on how to configure |
| /// this. |
| /// |
| /// This value is checked by the `event!` and `span!` macros. Code that |
| /// manually constructs events or spans via the `Event::record` function or |
| /// `Span` constructors should compare the level against this value to |
| /// determine if those spans or events are enabled. |
| /// |
| /// [module-level documentation]: super#compile-time-filters |
| </span><span class="kw">pub const </span>STATIC_MAX_LEVEL: LevelFilter = MAX_LEVEL; |
| |
| <span class="macro">cfg_if::cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_off"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::OFF; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_error"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::ERROR; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_warn"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::WARN; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_info"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::INFO; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_debug"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::DEBUG; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(not(debug_assertions), feature = <span class="string">"release_max_level_trace"</span>))] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::TRACE; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"max_level_off"</span>)] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::OFF; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"max_level_error"</span>)] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::ERROR; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"max_level_warn"</span>)] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::WARN; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"max_level_info"</span>)] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::INFO; |
| } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"max_level_debug"</span>)] </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::DEBUG; |
| } <span class="kw">else </span>{ |
| <span class="kw">const </span>MAX_LEVEL: LevelFilter = LevelFilter::TRACE; |
| } |
| } |
| </code></pre></div> |
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