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For the release documentation, please see docs.rs, instead.

tracing_subscriber::fmt::writer

Struct WithMaxLevel

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pub struct WithMaxLevel<M> { /* private fields */ }
Available on crate features fmt and std only.
Expand description

A MakeWriter combinator that only returns an enabled writer for spans and events with metadata at or below a specified verbosity Level.

This is returned by the `MakeWriterExt::with_max_level method. See the method documentation for details.

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impl<M> WithMaxLevel<M>

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pub fn new(make: M, level: Level) -> Self

Wraps the provided MakeWriter with a maximum Level, so that it returns OptionalWriter::none for spans and events whose level is more verbose than the maximum level.

See MakeWriterExt::with_max_level for details.

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impl<M: Clone> Clone for WithMaxLevel<M>

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fn clone(&self) -> WithMaxLevel<M>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<M: Debug> Debug for WithMaxLevel<M>

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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<'a, M: MakeWriter<'a>> MakeWriter<'a> for WithMaxLevel<M>

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type Writer = EitherWriter<<M as MakeWriter<'a>>::Writer, Sink>

The concrete io::Write implementation returned by make_writer.
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fn make_writer(&'a self) -> Self::Writer

Returns an instance of Writer. Read more
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fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer

Returns a Writer for writing data from the span or event described by the provided Metadata. Read more
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impl<M: PartialEq> PartialEq for WithMaxLevel<M>

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fn eq(&self, other: &WithMaxLevel<M>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<M: Copy> Copy for WithMaxLevel<M>

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impl<M: Eq> Eq for WithMaxLevel<M>

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impl<M> StructuralPartialEq for WithMaxLevel<M>

Auto Trait Implementations§

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impl<M> Freeze for WithMaxLevel<M>
where M: Freeze,

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impl<M> RefUnwindSafe for WithMaxLevel<M>
where M: RefUnwindSafe,

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impl<M> Send for WithMaxLevel<M>
where M: Send,

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impl<M> Sync for WithMaxLevel<M>
where M: Sync,

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impl<M> Unpin for WithMaxLevel<M>
where M: Unpin,

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impl<M> UnwindSafe for WithMaxLevel<M>
where M: UnwindSafe,

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. 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<'a, M> MakeWriterExt<'a> for M
where M: MakeWriter<'a>,

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fn with_max_level(self, level: Level) -> WithMaxLevel<Self>
where Self: Sized,

Available on crate features fmt and std only.
Wraps self and returns a MakeWriter that will only write output for events at or below the provided verbosity Level. For instance, Level::TRACE is considered to be _more verbosethanLevel::INFO`. Read more
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fn with_min_level(self, level: Level) -> WithMinLevel<Self>
where Self: Sized,

Available on crate features fmt and std only.
Wraps self and returns a MakeWriter that will only write output for events at or above the provided verbosity Level. Read more
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fn with_filter<F>(self, filter: F) -> WithFilter<Self, F>
where Self: Sized, F: Fn(&Metadata<'_>) -> bool,

Available on crate features fmt and std only.
Wraps self with a predicate that takes a span or event’s Metadata and returns a bool. The returned MakeWriter’s MakeWriter::make_writer_for method will check the predicate to determine if a writer should be produced for a given span or event. Read more
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fn and<B>(self, other: B) -> Tee<Self, B>
where Self: Sized, B: MakeWriter<'a> + Sized,

Available on crate features fmt and std only.
Combines self with another type implementing MakeWriter, returning a new MakeWriter that produces writers that write to both outputs. Read more
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fn or_else<W, B>(self, other: B) -> OrElse<Self, B>
where Self: MakeWriter<'a, Writer = OptionalWriter<W>> + Sized, B: MakeWriter<'a> + Sized, W: Write,

Available on crate features fmt and std only.
Combines self with another type implementing MakeWriter, returning a new MakeWriter that calls other’s make_writer if self’s make_writer returns OptionalWriter::none. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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> WithCollector for T

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fn with_collector<C>(self, collector: C) -> WithDispatch<Self>
where C: Into<Dispatch>,

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

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