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Diffstat (limited to 'vendor/tracing-subscriber/src/filter/targets.rs')
| -rw-r--r-- | vendor/tracing-subscriber/src/filter/targets.rs | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber/src/filter/targets.rs b/vendor/tracing-subscriber/src/filter/targets.rs new file mode 100644 index 000000000..e1407114b --- /dev/null +++ b/vendor/tracing-subscriber/src/filter/targets.rs @@ -0,0 +1,781 @@ +//! A [filter] that enables or disables spans and events based on their [target] and [level]. +//! +//! See [`Targets`] for details. +//! +//! [target]: tracing_core::Metadata::target +//! [level]: tracing_core::Level +//! [filter]: crate::layer#filtering-with-layers + +use crate::{ + filter::{ + directive::{DirectiveSet, ParseError, StaticDirective}, + LevelFilter, + }, + layer, +}; +#[cfg(not(feature = "std"))] +use alloc::string::String; +use core::{ + iter::{Extend, FilterMap, FromIterator}, + slice, + str::FromStr, +}; +use tracing_core::{Interest, Level, Metadata, Subscriber}; + +/// A filter that enables or disables spans and events based on their [target] +/// and [level]. +/// +/// Targets are typically equal to the Rust module path of the code where the +/// span or event was recorded, although they may be overridden. +/// +/// This type can be used for both [per-layer filtering][plf] (using its +/// [`Filter`] implementation) and [global filtering][global] (using its +/// [`Layer`] implementation). +/// +/// See the [documentation on filtering with layers][filtering] for details. +/// +/// # Filtering With `Targets` +/// +/// A `Targets` filter consists of one or more [target] prefixes, paired with +/// [`LevelFilter`]s. If a span or event's [target] begins with one of those +/// prefixes, and its [level] is at or below the [`LevelFilter`] enabled for +/// that prefix, then the span or event will be enabled. +/// +/// This is similar to the behavior implemented by the [`env_logger` crate] in +/// the `log` ecosystem. +/// +/// The [`EnvFilter`] type also provided by this crate is very similar to `Targets`, +/// but is capable of a more sophisticated form of filtering where events may +/// also be enabled or disabled based on the span they are recorded in. +/// `Targets` can be thought of as a lighter-weight form of [`EnvFilter`] that +/// can be used instead when this dynamic filtering is not required. +/// +/// # Examples +/// +/// A `Targets` filter can be constructed by programmatically adding targets and +/// levels to enable: +/// +/// ``` +/// use tracing_subscriber::{filter, prelude::*}; +/// use tracing_core::Level; +/// +/// let filter = filter::Targets::new() +/// // Enable the `INFO` level for anything in `my_crate` +/// .with_target("my_crate", Level::INFO) +/// // Enable the `DEBUG` level for a specific module. +/// .with_target("my_crate::interesting_module", Level::DEBUG); +/// +/// // Build a new subscriber with the `fmt` layer using the `Targets` +/// // filter we constructed above. +/// tracing_subscriber::registry() +/// .with(tracing_subscriber::fmt::layer()) +/// .with(filter) +/// .init(); +/// ``` +/// +/// [`LevelFilter::OFF`] can be used to disable a particular target: +/// ``` +/// use tracing_subscriber::filter::{Targets, LevelFilter}; +/// use tracing_core::Level; +/// +/// let filter = Targets::new() +/// .with_target("my_crate", Level::INFO) +/// // Disable all traces from `annoying_module`. +/// .with_target("my_crate::annoying_module", LevelFilter::OFF); +/// # drop(filter); +/// ``` +/// +/// Alternatively, `Targets` implements [`std::str::FromStr`], allowing it to be +/// parsed from a comma-delimited list of `target=level` pairs. For example: +/// +/// ```rust +/// # fn main() -> Result<(), Box<dyn std::error::Error>> { +/// use tracing_subscriber::filter; +/// use tracing_core::Level; +/// +/// let filter = "my_crate=info,my_crate::interesting_module=trace,other_crate=debug" +/// .parse::<filter::Targets>()?; +/// +/// // The parsed filter is identical to a filter constructed using `with_target`: +/// assert_eq!( +/// filter, +/// filter::Targets::new() +/// .with_target("my_crate", Level::INFO) +/// .with_target("my_crate::interesting_module", Level::TRACE) +/// .with_target("other_crate", Level::DEBUG) +/// ); +/// # Ok(()) } +/// ``` +/// +/// This is particularly useful when the list of enabled targets is configurable +/// by the user at runtime. +/// +/// The `Targets` filter can be used as a [per-layer filter][plf] *and* as a +/// [global filter][global]: +/// +/// ```rust +/// use tracing_subscriber::{ +/// fmt, +/// filter::{Targets, LevelFilter}, +/// prelude::*, +/// }; +/// use tracing_core::Level; +/// use std::{sync::Arc, fs::File}; +/// # fn docs() -> Result<(), Box<dyn std::error::Error>> { +/// +/// // A layer that logs events to stdout using the human-readable "pretty" +/// // format. +/// let stdout_log = fmt::layer().pretty(); +/// +/// // A layer that logs events to a file, using the JSON format. +/// let file = File::create("debug_log.json")?; +/// let debug_log = fmt::layer() +/// .with_writer(Arc::new(file)) +/// .json(); +/// +/// tracing_subscriber::registry() +/// // Only log INFO and above to stdout, unless the span or event +/// // has the `my_crate::cool_module` target prefix. +/// .with(stdout_log +/// .with_filter( +/// Targets::default() +/// .with_target("my_crate::cool_module", Level::DEBUG) +/// .with_default(Level::INFO) +/// ) +/// ) +/// // Log everything enabled by the global filter to `debug_log.json`. +/// .with(debug_log) +/// // Configure a global filter for the whole subscriber stack. This will +/// // control what spans and events are recorded by both the `debug_log` +/// // and the `stdout_log` layers, and `stdout_log` will *additionally* be +/// // filtered by its per-layer filter. +/// .with( +/// Targets::default() +/// .with_target("my_crate", Level::TRACE) +/// .with_target("other_crate", Level::INFO) +/// .with_target("other_crate::annoying_module", LevelFilter::OFF) +/// .with_target("third_crate", Level::DEBUG) +/// ).init(); +/// # Ok(()) } +///``` +/// +/// [target]: tracing_core::Metadata::target +/// [level]: tracing_core::Level +/// [`Filter`]: crate::layer::Filter +/// [`Layer`]: crate::layer::Layer +/// [plf]: crate::layer#per-layer-filtering +/// [global]: crate::layer#global-filtering +/// [filtering]: crate::layer#filtering-with-layers +/// [`env_logger` crate]: https://docs.rs/env_logger/0.9.0/env_logger/index.html#enabling-logging +/// [`EnvFilter`]: crate::filter::EnvFilter +#[derive(Debug, Default, Clone, PartialEq)] +pub struct Targets(DirectiveSet<StaticDirective>); + +impl Targets { + /// Returns a new `Targets` filter. + /// + /// This filter will enable no targets. Call [`with_target`] or [`with_targets`] + /// to add enabled targets, and [`with_default`] to change the default level + /// enabled for spans and events that didn't match any of the provided targets. + /// + /// [`with_target`]: Targets::with_target + /// [`with_targets`]: Targets::with_targets + /// [`with_default`]: Targets::with_default + pub fn new() -> Self { + Self::default() + } + + /// Enables spans and events with [target]s starting with the provided target + /// prefix if they are at or below the provided [`LevelFilter`]. + /// + /// # Examples + /// + /// ``` + /// use tracing_subscriber::filter; + /// use tracing_core::Level; + /// + /// let filter = filter::Targets::new() + /// // Enable the `INFO` level for anything in `my_crate` + /// .with_target("my_crate", Level::INFO) + /// // Enable the `DEBUG` level for a specific module. + /// .with_target("my_crate::interesting_module", Level::DEBUG); + /// # drop(filter); + /// ``` + /// + /// [`LevelFilter::OFF`] can be used to disable a particular target: + /// ``` + /// use tracing_subscriber::filter::{Targets, LevelFilter}; + /// use tracing_core::Level; + /// + /// let filter = Targets::new() + /// .with_target("my_crate", Level::INFO) + /// // Disable all traces from `annoying_module`. + /// .with_target("my_crate::interesting_module", LevelFilter::OFF); + /// # drop(filter); + /// ``` + /// + /// [target]: tracing_core::Metadata::target + pub fn with_target(mut self, target: impl Into<String>, level: impl Into<LevelFilter>) -> Self { + self.0.add(StaticDirective::new( + Some(target.into()), + Default::default(), + level.into(), + )); + self + } + /// Adds [target]s from an iterator of [target]-[`LevelFilter`] pairs to this filter. + /// + /// # Examples + /// + /// ``` + /// use tracing_subscriber::filter; + /// use tracing_core::Level; + /// + /// let filter = filter::Targets::new() + /// .with_targets(vec![ + /// ("my_crate", Level::INFO), + /// ("my_crate::some_module", Level::DEBUG), + /// ("my_crate::other_module::cool_stuff", Level::TRACE), + /// ("other_crate", Level::WARN) + /// ]); + /// # drop(filter); + /// ``` + /// + /// [`LevelFilter::OFF`] can be used to disable a particular target: + /// ``` + /// use tracing_subscriber::filter::{Targets, LevelFilter}; + /// use tracing_core::Level; + /// + /// let filter = Targets::new() + /// .with_target("my_crate", Level::INFO) + /// // Disable all traces from `annoying_module`. + /// .with_target("my_crate::interesting_module", LevelFilter::OFF); + /// # drop(filter); + /// ``` + /// + /// [target]: tracing_core::Metadata::target + pub fn with_targets<T, L>(mut self, targets: impl IntoIterator<Item = (T, L)>) -> Self + where + String: From<T>, + LevelFilter: From<L>, + { + self.extend(targets); + self + } + + /// Sets the default level to enable for spans and events whose targets did + /// not match any of the configured prefixes. + /// + /// By default, this is [`LevelFilter::OFF`]. This means that spans and + /// events will only be enabled if they match one of the configured target + /// prefixes. If this is changed to a different [`LevelFilter`], spans and + /// events with targets that did not match any of the configured prefixes + /// will be enabled if their level is at or below the provided level. + pub fn with_default(mut self, level: impl Into<LevelFilter>) -> Self { + self.0 + .add(StaticDirective::new(None, Default::default(), level.into())); + self + } + + /// Returns the default level for this filter, if one is set. + /// + /// The default level is used to filter any spans or events with targets + /// that do not match any of the configured set of prefixes. + /// + /// The default level can be set for a filter either by using + /// [`with_default`](Self::with_default) or when parsing from a filter string that includes a + /// level without a target (e.g. `"trace"`). + /// + /// # Examples + /// + /// ``` + /// use tracing_subscriber::filter::{LevelFilter, Targets}; + /// + /// let filter = Targets::new().with_default(LevelFilter::INFO); + /// assert_eq!(filter.default_level(), Some(LevelFilter::INFO)); + /// + /// let filter: Targets = "info".parse().unwrap(); + /// assert_eq!(filter.default_level(), Some(LevelFilter::INFO)); + /// ``` + /// + /// The default level is `None` if no default is set: + /// + /// ``` + /// use tracing_subscriber::filter::Targets; + /// + /// let filter = Targets::new(); + /// assert_eq!(filter.default_level(), None); + /// + /// let filter: Targets = "my_crate=info".parse().unwrap(); + /// assert_eq!(filter.default_level(), None); + /// ``` + /// + /// Note that an unset default level (`None`) behaves like [`LevelFilter::OFF`] when the filter is + /// used, but it could also be set explicitly which may be useful to distinguish (such as when + /// merging multiple `Targets`). + /// + /// ``` + /// use tracing_subscriber::filter::{LevelFilter, Targets}; + /// + /// let filter = Targets::new().with_default(LevelFilter::OFF); + /// assert_eq!(filter.default_level(), Some(LevelFilter::OFF)); + /// + /// let filter: Targets = "off".parse().unwrap(); + /// assert_eq!(filter.default_level(), Some(LevelFilter::OFF)); + /// ``` + pub fn default_level(&self) -> Option<LevelFilter> { + self.0.directives().into_iter().find_map(|d| { + if d.target.is_none() { + Some(d.level) + } else { + None + } + }) + } + + /// Returns an iterator over the [target]-[`LevelFilter`] pairs in this filter. + /// + /// The order of iteration is undefined. + /// + /// # Examples + /// + /// ``` + /// use tracing_subscriber::filter::{Targets, LevelFilter}; + /// use tracing_core::Level; + /// + /// let filter = Targets::new() + /// .with_target("my_crate", Level::INFO) + /// .with_target("my_crate::interesting_module", Level::DEBUG); + /// + /// let mut targets: Vec<_> = filter.iter().collect(); + /// targets.sort(); + /// + /// assert_eq!(targets, vec![ + /// ("my_crate", LevelFilter::INFO), + /// ("my_crate::interesting_module", LevelFilter::DEBUG), + /// ]); + /// ``` + /// + /// [target]: tracing_core::Metadata::target + pub fn iter(&self) -> Iter<'_> { + self.into_iter() + } + + #[inline] + fn interested(&self, metadata: &'static Metadata<'static>) -> Interest { + if self.0.enabled(metadata) { + Interest::always() + } else { + Interest::never() + } + } + + /// Returns whether a [target]-[`Level`] pair would be enabled + /// by this `Targets`. + /// + /// This method can be used with [`module_path!`] from `std` as the target + /// in order to emulate the behavior of the [`tracing::event!`] and [`tracing::span!`] + /// macros. + /// + /// # Examples + /// + /// ``` + /// use tracing_subscriber::filter::{Targets, LevelFilter}; + /// use tracing_core::Level; + /// + /// let filter = Targets::new() + /// .with_target("my_crate", Level::INFO) + /// .with_target("my_crate::interesting_module", Level::DEBUG); + /// + /// assert!(filter.would_enable("my_crate", &Level::INFO)); + /// assert!(!filter.would_enable("my_crate::interesting_module", &Level::TRACE)); + /// ``` + /// + /// [target]: tracing_core::Metadata::target + /// [`module_path!`]: std::module_path! + pub fn would_enable(&self, target: &str, level: &Level) -> bool { + // "Correct" to call because `Targets` only produces `StaticDirective`'s with NO + // fields + self.0.target_enabled(target, level) + } +} + +impl<T, L> Extend<(T, L)> for Targets +where + T: Into<String>, + L: Into<LevelFilter>, +{ + fn extend<I: IntoIterator<Item = (T, L)>>(&mut self, iter: I) { + let iter = iter.into_iter().map(|(target, level)| { + StaticDirective::new(Some(target.into()), Default::default(), level.into()) + }); + self.0.extend(iter); + } +} + +impl<T, L> FromIterator<(T, L)> for Targets +where + T: Into<String>, + L: Into<LevelFilter>, +{ + fn from_iter<I: IntoIterator<Item = (T, L)>>(iter: I) -> Self { + let mut this = Self::default(); + this.extend(iter); + this + } +} + +impl FromStr for Targets { + type Err = ParseError; + fn from_str(s: &str) -> Result<Self, Self::Err> { + s.split(',') + .map(StaticDirective::from_str) + .collect::<Result<_, _>>() + .map(Self) + } +} + +impl<S> layer::Layer<S> for Targets +where + S: Subscriber, +{ + fn enabled(&self, metadata: &Metadata<'_>, _: layer::Context<'_, S>) -> bool { + self.0.enabled(metadata) + } + + fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest { + self.interested(metadata) + } + + fn max_level_hint(&self) -> Option<LevelFilter> { + Some(self.0.max_level) + } +} + +#[cfg(feature = "registry")] +#[cfg_attr(docsrs, doc(cfg(feature = "registry")))] +impl<S> layer::Filter<S> for Targets { + fn enabled(&self, metadata: &Metadata<'_>, _: &layer::Context<'_, S>) -> bool { + self.0.enabled(metadata) + } + + fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest { + self.interested(metadata) + } + + fn max_level_hint(&self) -> Option<LevelFilter> { + Some(self.0.max_level) + } +} + +impl IntoIterator for Targets { + type Item = (String, LevelFilter); + + type IntoIter = IntoIter; + + fn into_iter(self) -> Self::IntoIter { + IntoIter::new(self) + } +} + +impl<'a> IntoIterator for &'a Targets { + type Item = (&'a str, LevelFilter); + + type IntoIter = Iter<'a>; + + fn into_iter(self) -> Self::IntoIter { + Iter::new(self) + } +} + +/// An owning iterator over the [target]-[level] pairs of a `Targets` filter. +/// +/// This struct is created by the `IntoIterator` trait implementation of [`Targets`]. +/// +/// # Examples +/// +/// Merge the targets from one `Targets` with another: +/// +/// ``` +/// use tracing_subscriber::filter::Targets; +/// use tracing_core::Level; +/// +/// let mut filter = Targets::new().with_target("my_crate", Level::INFO); +/// let overrides = Targets::new().with_target("my_crate::interesting_module", Level::DEBUG); +/// +/// filter.extend(overrides); +/// # drop(filter); +/// ``` +/// +/// [target]: tracing_core::Metadata::target +/// [level]: tracing_core::Level +#[derive(Debug)] +pub struct IntoIter( + #[allow(clippy::type_complexity)] // alias indirection would probably make this more confusing + FilterMap< + <DirectiveSet<StaticDirective> as IntoIterator>::IntoIter, + fn(StaticDirective) -> Option<(String, LevelFilter)>, + >, +); + +impl IntoIter { + fn new(targets: Targets) -> Self { + Self(targets.0.into_iter().filter_map(|directive| { + let level = directive.level; + directive.target.map(|target| (target, level)) + })) + } +} + +impl Iterator for IntoIter { + type Item = (String, LevelFilter); + + fn next(&mut self) -> Option<Self::Item> { + self.0.next() + } + + fn size_hint(&self) -> (usize, Option<usize>) { + self.0.size_hint() + } +} + +/// A borrowing iterator over the [target]-[level] pairs of a `Targets` filter. +/// +/// This struct is created by [`iter`] method of [`Targets`], or from the `IntoIterator` +/// implementation for `&Targets`. +/// +/// [target]: tracing_core::Metadata::target +/// [level]: tracing_core::Level +/// [`iter`]: Targets::iter +#[derive(Debug)] +pub struct Iter<'a>( + FilterMap< + slice::Iter<'a, StaticDirective>, + fn(&'a StaticDirective) -> Option<(&'a str, LevelFilter)>, + >, +); + +impl<'a> Iter<'a> { + fn new(targets: &'a Targets) -> Self { + Self(targets.0.iter().filter_map(|directive| { + directive + .target + .as_deref() + .map(|target| (target, directive.level)) + })) + } +} + +impl<'a> Iterator for Iter<'a> { + type Item = (&'a str, LevelFilter); + + fn next(&mut self) -> Option<Self::Item> { + self.0.next() + } + + fn size_hint(&self) -> (usize, Option<usize>) { + self.0.size_hint() + } +} + +#[cfg(test)] +mod tests { + use super::*; + + feature! { + #![not(feature = "std")] + use alloc::{vec, vec::Vec, string::ToString}; + + // `dbg!` is only available with `libstd`; just nop it out when testing + // with alloc only. + macro_rules! dbg { + ($x:expr) => { $x } + } + } + + fn expect_parse(s: &str) -> Targets { + match dbg!(s).parse::<Targets>() { + Err(e) => panic!("string {:?} did not parse successfully: {}", s, e), + Ok(e) => e, + } + } + + fn expect_parse_ralith(s: &str) { + let dirs = expect_parse(s).0.into_vec(); + assert_eq!(dirs.len(), 2, "\nparsed: {:#?}", dirs); + assert_eq!(dirs[0].target, Some("server".to_string())); + assert_eq!(dirs[0].level, LevelFilter::DEBUG); + assert_eq!(dirs[0].field_names, Vec::<String>::new()); + + assert_eq!(dirs[1].target, Some("common".to_string())); + assert_eq!(dirs[1].level, LevelFilter::INFO); + assert_eq!(dirs[1].field_names, Vec::<String>::new()); + } + + fn expect_parse_level_directives(s: &str) { + let dirs = expect_parse(s).0.into_vec(); + assert_eq!(dirs.len(), 6, "\nparsed: {:#?}", dirs); + + assert_eq!(dirs[0].target, Some("crate3::mod2::mod1".to_string())); + assert_eq!(dirs[0].level, LevelFilter::OFF); + assert_eq!(dirs[0].field_names, Vec::<String>::new()); + + assert_eq!(dirs[1].target, Some("crate1::mod2::mod3".to_string())); + assert_eq!(dirs[1].level, LevelFilter::INFO); + assert_eq!(dirs[1].field_names, Vec::<String>::new()); + + assert_eq!(dirs[2].target, Some("crate1::mod2".to_string())); + assert_eq!(dirs[2].level, LevelFilter::WARN); + assert_eq!(dirs[2].field_names, Vec::<String>::new()); + + assert_eq!(dirs[3].target, Some("crate1::mod1".to_string())); + assert_eq!(dirs[3].level, LevelFilter::ERROR); + assert_eq!(dirs[3].field_names, Vec::<String>::new()); + + assert_eq!(dirs[4].target, Some("crate3".to_string())); + assert_eq!(dirs[4].level, LevelFilter::TRACE); + assert_eq!(dirs[4].field_names, Vec::<String>::new()); + + assert_eq!(dirs[5].target, Some("crate2".to_string())); + assert_eq!(dirs[5].level, LevelFilter::DEBUG); + assert_eq!(dirs[5].field_names, Vec::<String>::new()); + } + + #[test] + fn parse_ralith() { + expect_parse_ralith("common=info,server=debug"); + } + + #[test] + fn parse_ralith_uc() { + expect_parse_ralith("common=INFO,server=DEBUG"); + } + + #[test] + fn parse_ralith_mixed() { + expect_parse("common=iNfo,server=dEbUg"); + } + + #[test] + fn expect_parse_valid() { + let dirs = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off") + .0 + .into_vec(); + assert_eq!(dirs.len(), 4, "\nparsed: {:#?}", dirs); + assert_eq!(dirs[0].target, Some("crate1::mod2".to_string())); + assert_eq!(dirs[0].level, LevelFilter::TRACE); + assert_eq!(dirs[0].field_names, Vec::<String>::new()); + + assert_eq!(dirs[1].target, Some("crate1::mod1".to_string())); + assert_eq!(dirs[1].level, LevelFilter::ERROR); + assert_eq!(dirs[1].field_names, Vec::<String>::new()); + + assert_eq!(dirs[2].target, Some("crate3".to_string())); + assert_eq!(dirs[2].level, LevelFilter::OFF); + assert_eq!(dirs[2].field_names, Vec::<String>::new()); + + assert_eq!(dirs[3].target, Some("crate2".to_string())); + assert_eq!(dirs[3].level, LevelFilter::DEBUG); + assert_eq!(dirs[3].field_names, Vec::<String>::new()); + } + + #[test] + fn parse_level_directives() { + expect_parse_level_directives( + "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\ + crate2=debug,crate3=trace,crate3::mod2::mod1=off", + ) + } + + #[test] + fn parse_uppercase_level_directives() { + expect_parse_level_directives( + "crate1::mod1=ERROR,crate1::mod2=WARN,crate1::mod2::mod3=INFO,\ + crate2=DEBUG,crate3=TRACE,crate3::mod2::mod1=OFF", + ) + } + + #[test] + fn parse_numeric_level_directives() { + expect_parse_level_directives( + "crate1::mod1=1,crate1::mod2=2,crate1::mod2::mod3=3,crate2=4,\ + crate3=5,crate3::mod2::mod1=0", + ) + } + + #[test] + fn targets_iter() { + let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off") + .with_default(LevelFilter::WARN); + + let mut targets: Vec<_> = filter.iter().collect(); + targets.sort(); + + assert_eq!( + targets, + vec![ + ("crate1::mod1", LevelFilter::ERROR), + ("crate1::mod2", LevelFilter::TRACE), + ("crate2", LevelFilter::DEBUG), + ("crate3", LevelFilter::OFF), + ] + ); + } + + #[test] + fn targets_into_iter() { + let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off") + .with_default(LevelFilter::WARN); + + let mut targets: Vec<_> = filter.into_iter().collect(); + targets.sort(); + + assert_eq!( + targets, + vec![ + ("crate1::mod1".to_string(), LevelFilter::ERROR), + ("crate1::mod2".to_string(), LevelFilter::TRACE), + ("crate2".to_string(), LevelFilter::DEBUG), + ("crate3".to_string(), LevelFilter::OFF), + ] + ); + } + + #[test] + fn targets_default_level() { + let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off"); + assert_eq!(filter.default_level(), None); + + let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off") + .with_default(LevelFilter::OFF); + assert_eq!(filter.default_level(), Some(LevelFilter::OFF)); + + let filter = expect_parse("crate1::mod1=error,crate1::mod2,crate2=debug,crate3=off") + .with_default(LevelFilter::OFF) + .with_default(LevelFilter::INFO); + assert_eq!(filter.default_level(), Some(LevelFilter::INFO)); + } + + #[test] + // `println!` is only available with `libstd`. + #[cfg(feature = "std")] + fn size_of_filters() { + fn print_sz(s: &str) { + let filter = s.parse::<Targets>().expect("filter should parse"); + println!( + "size_of_val({:?})\n -> {}B", + s, + std::mem::size_of_val(&filter) + ); + } + + print_sz("info"); + + print_sz("foo=debug"); + + print_sz( + "crate1::mod1=error,crate1::mod2=warn,crate1::mod2::mod3=info,\ + crate2=debug,crate3=trace,crate3::mod2::mod1=off", + ); + } +} |