🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

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

tracing_subscriber::fmt::writer

Struct BoxMakeWriter

Source
pub struct BoxMakeWriter { /* private fields */ }
Available on crate features fmt and std only.
Expand description

A writer that erases the specific io::Write and MakeWriter types being used.

This is useful in cases where the concrete type of the writer cannot be known until runtime.

§Examples

A function that returns a Collect that will write to either stdout or stderr:


fn dynamic_writer(use_stderr: bool) -> impl Collect {
    let writer = if use_stderr {
        BoxMakeWriter::new(std::io::stderr)
    } else {
        BoxMakeWriter::new(std::io::stdout)
    };

    tracing_subscriber::fmt().with_writer(writer).finish()
}

Implementations§

Source§

impl BoxMakeWriter

Source

pub fn new<M>(make_writer: M) -> Self
where M: for<'a> MakeWriter<'a> + Send + Sync + 'static,

Constructs a BoxMakeWriter wrapping a type implementing MakeWriter.

Trait Implementations§

Source§

impl Debug for BoxMakeWriter

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<'a> MakeWriter<'a> for BoxMakeWriter

Source§

type Writer = Box<dyn Write + 'a>

The concrete io::Write implementation returned by make_writer.
Source§

fn make_writer(&'a self) -> Self::Writer

Returns an instance of Writer. Read more
Source§

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

Auto Trait Implementations§

Blanket Implementations§

Source§

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

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

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

Mutably borrows from an owned value. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T> Instrument for T

Source§

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

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

Source§

impl<'a, M> MakeWriterExt<'a> for M
where M: MakeWriter<'a>,

Source§

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
Source§

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
Source§

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
Source§

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
Source§

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
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

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

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

impl<T> WithCollector for T

Source§

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
Source§

fn with_current_collector(self) -> WithDispatch<Self>

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