Struct tracing_subscriber::filter::LevelFilter

#[repr(transparent)]pub struct LevelFilter(_);

A filter comparable to a verbosity Level.

If a Level is considered less than a LevelFilter, it should be considered disabled; if greater than or equal to the LevelFilter, that level is enabled.

Note that this is essentially identical to the Level type, but with the addition of an OFF level that completely disables all trace instrumentation.

Implementations

impl LevelFilter

pub const OFF: LevelFilter

The "off" level.

Designates that trace instrumentation should be completely disabled.

pub const ERROR: LevelFilter

The "error" level.

Designates very serious errors.

pub const WARN: LevelFilter

The "warn" level.

Designates hazardous situations.

pub const INFO: LevelFilter

The "info" level.

Designates useful information.

pub const DEBUG: LevelFilter

The "debug" level.

Designates lower priority information.

pub const TRACE: LevelFilter

The "trace" level.

Designates very low priority, often extremely verbose, information.

pub const fn from_level(level: Level) -> LevelFilter

Returns a LevelFilter that enables spans and events with verbosity up to and including level.

pub const fn into_level(self) -> Option<Level>

Returns the most verbose Level that this filter accepts, or None if it is OFF.

pub fn current() -> LevelFilter

Returns a LevelFilter that matches the most verbose Level that any currently active Subscriber will enable.

User code should treat this as a hint. If a given span or event has a level higher than the returned LevelFilter, it will not be enabled. However, if the level is less than or equal to this value, the span or event is not guaranteed to be enabled; the subscriber will still filter each callsite individually.

Therefore, comparing a given span or event's level to the returned LevelFilter can be used for determining if something is disabled, but should not be used for determining if something is enabled.`

Trait Implementations

impl Clone for LevelFilter

fn clone(&self) -> LevelFilter

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LevelFilter

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for LevelFilter

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for LevelFilter

impl From<Level> for LevelFilter

fn from(level: Level) -> LevelFilter

Performs the conversion.

impl From<LevelFilter> for Directive

fn from(level: LevelFilter) -> Self

Performs the conversion.

impl From<Option<Level>> for LevelFilter

fn from(level: Option<Level>) -> LevelFilter

Performs the conversion.

impl FromStr for LevelFilter

type Err = ParseLevelFilterError

The associated error which can be returned from parsing.

fn from_str(from: &str) -> Result<LevelFilter, <LevelFilter as FromStr>::Err>

Parses a string s to return a value of this type.

impl Into<Option<Level>> for LevelFilter

fn into(self) -> Option<Level>

Performs the conversion.

impl<S: Subscriber> Layer<S> for LevelFilter

fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest

Registers a new callsite with this layer, returning whether or not the layer is interested in being notified about the callsite, similarly to Subscriber::register_callsite.

fn enabled(&self, metadata: &Metadata<'_>, _: Context<'_, S>) -> bool

Returns true if this layer is interested in a span or event with the given metadata in the current Context, similarly to Subscriber::enabled.

fn max_level_hint(&self) -> Option<LevelFilter>

fn new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>)

Notifies this layer that a new span was constructed with the given Attributes and Id.

fn on_record(&self, _span: &Id, _values: &Record<'_>, _ctx: Context<'_, S>)

Notifies this layer that a span with the given Id recorded the given values.

fn on_follows_from(&self, _span: &Id, _follows: &Id, _ctx: Context<'_, S>)

Notifies this layer that a span with the ID span recorded that it follows from the span with the ID follows.

fn on_event(&self, _event: &Event<'_>, _ctx: Context<'_, S>)

Notifies this layer that an event has occurred.

fn on_enter(&self, _id: &Id, _ctx: Context<'_, S>)

Notifies this layer that a span with the given ID was entered.

fn on_exit(&self, _id: &Id, _ctx: Context<'_, S>)

Notifies this layer that the span with the given ID was exited.

fn on_close(&self, _id: Id, _ctx: Context<'_, S>)

Notifies this layer that the span with the given ID has been closed.

fn on_id_change(&self, _old: &Id, _new: &Id, _ctx: Context<'_, S>)

Notifies this layer that a span ID has been cloned, and that the subscriber returned a different ID.

fn and_then<L>(self, layer: L) -> Layered<L, Self, S> where
    L: Layer<S>,
    Self: Sized, 

Composes this layer around the given Layer, returning a Layered struct implementing Layer.

fn with_subscriber(self, inner: S) -> Layered<Self, S> where
    Self: Sized, 

Composes this Layer with the given Subscriber, returning a Layered struct that implements Subscriber.

impl Ord for LevelFilter

fn cmp(&self, other: &LevelFilter) -> Ordering

This method returns an Ordering between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp #44095)

Restrict a value to a certain interval.

impl PartialEq<Level> for LevelFilter

fn eq(&self, other: &Level) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<LevelFilter> for LevelFilter

fn eq(&self, other: &LevelFilter) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &LevelFilter) -> bool

This method tests for !=.

impl PartialOrd<Level> for LevelFilter

fn partial_cmp(&self, other: &Level) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Level) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Level) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Level) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Level) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartialOrd<LevelFilter> for LevelFilter

fn partial_cmp(&self, other: &LevelFilter) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &LevelFilter) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &LevelFilter) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &LevelFilter) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &LevelFilter) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.