tracing_subscriber::fmt

Struct Subscriber

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pub struct Subscriber<N = DefaultFields, E = Format<Full>, F = LevelFilter, W = fn() -> Stdout> { /* private fields */ }
Expand description

A Subscriber that logs formatted representations of tracing events.

This consists of an inner Formatter wrapped in a layer that performs filtering.

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impl Subscriber

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pub const DEFAULT_MAX_LEVEL: LevelFilter = LevelFilter::INFO

The maximum verbosity level that is enabled by a Subscriber by default.

This can be overridden with the SubscriberBuilder::with_max_level method.

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pub fn builder() -> SubscriberBuilder

Returns a new SubscriberBuilder for configuring a format subscriber.

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pub fn new() -> Self

Returns a new format subscriber with the default configuration.

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impl<N: Debug, E: Debug, F: Debug, W: Debug> Debug for Subscriber<N, E, F, W>

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

Formats the value using the given formatter. Read more
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impl Default for Subscriber

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'a, N, E, F, W> LookupSpan<'a> for Subscriber<N, E, F, W>
where Layered<F, Formatter<N, E, W>>: LookupSpan<'a>,

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type Data = <Layered<F, Layered<Layer<Registry, N, E, W>, Registry>> as LookupSpan<'a>>::Data

The type of span data stored in this registry.
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fn span_data(&'a self, id: &Id) -> Option<Self::Data>

Returns the SpanData for a given Id, if it exists. Read more
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fn span(&'a self, id: &Id) -> Option<SpanRef<'_, Self>>
where Self: Sized,

Returns a SpanRef for the span with the given Id, if it exists. Read more
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fn register_filter(&mut self) -> FilterId

Registers a Filter for per-layer filtering with this Subscriber. Read more
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impl<N, E, F, W> Subscriber for Subscriber<N, E, F, W>
where N: for<'writer> FormatFields<'writer> + 'static, E: FormatEvent<Registry, N> + 'static, F: Layer<Formatter<N, E, W>> + 'static, W: for<'writer> MakeWriter<'writer> + 'static, Layered<F, Formatter<N, E, W>>: Subscriber, Layer<Registry, N, E, W>: Layer<Registry>,

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

Registers a new callsite with this subscriber, returning whether or not the subscriber is interested in being notified about the callsite. Read more
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fn enabled(&self, meta: &Metadata<'_>) -> bool

Returns true if a span or event with the specified metadata would be recorded. Read more
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fn new_span(&self, attrs: &Attributes<'_>) -> Id

Visit the construction of a new span, returning a new span ID for the span being constructed. Read more
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fn record(&self, span: &Id, values: &Record<'_>)

Record a set of values on a span. Read more
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fn record_follows_from(&self, span: &Id, follows: &Id)

Adds an indication that span follows from the span with the id follows. Read more
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fn event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded. Read more
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fn event(&self, event: &Event<'_>)

Records that an Event has occurred. Read more
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fn enter(&self, id: &Id)

Records that a span has been entered. Read more
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fn exit(&self, id: &Id)

Records that a span has been exited. Read more
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fn current_span(&self) -> Current

Returns a type representing this subscriber’s view of the current span. Read more
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fn clone_span(&self, id: &Id) -> Id

Notifies the subscriber that a span ID has been cloned. Read more
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fn try_close(&self, id: Id) -> bool

Notifies the subscriber that a span ID has been dropped, and returns true if there are now 0 IDs that refer to that span. Read more
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fn max_level_hint(&self) -> Option<LevelFilter>

Returns the highest verbosity level that this Subscriber will enable, or None, if the subscriber does not implement level-based filtering or chooses not to implement this method. Read more
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unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()>

If self is the same type as the provided TypeId, returns an untyped *const pointer to that type. Otherwise, returns None. Read more
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fn on_register_dispatch(&self, subscriber: &Dispatch)

Invoked when this subscriber becomes a Dispatch. Read more
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fn drop_span(&self, _id: Id)

👎Deprecated since 0.1.2: use Subscriber::try_close instead
This method is deprecated. Read more

Auto Trait Implementations§

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impl<N = DefaultFields, E = Format, F = LevelFilter, W = fn() -> Stdout> !Freeze for Subscriber<N, E, F, W>

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impl<N, E, F, W> RefUnwindSafe for Subscriber<N, E, F, W>

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impl<N, E, F, W> Send for Subscriber<N, E, F, W>
where F: Send, W: Send, N: Send, E: Send,

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impl<N, E, F, W> Sync for Subscriber<N, E, F, W>
where F: Sync, W: Sync, N: Sync, E: Sync,

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impl<N, E, F, W> Unpin for Subscriber<N, E, F, W>
where F: Unpin, W: Unpin, N: Unpin, E: Unpin,

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impl<N = DefaultFields, E = Format, F = LevelFilter, W = fn() -> Stdout> !UnwindSafe for Subscriber<N, E, F, W>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<S> SubscriberExt for S
where S: Subscriber,

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

Wraps self with the provided layer.
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impl<T> SubscriberInitExt for T
where T: Into<Dispatch>,

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fn set_default(self) -> DefaultGuard

Sets self as the default subscriber in the current scope, returning a guard that will unset it when dropped. Read more
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fn try_init(self) -> Result<(), TryInitError>

Attempts to set self as the global default subscriber in the current scope, returning an error if one is already set. Read more
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fn init(self)

Attempts to set self as the global default subscriber in the current scope, panicking if this fails. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more