Struct tracing_subscriber::layer::Context

pub struct Context<'a, S> { /* fields omitted */ }

Represents information about the current context provided to Layers by the wrapped Subscriber.

Methods

impl<'a, S: Subscriber> Context<'a, S>

pub fn current_span(&self) -> Current

Returns the wrapped subscriber's view of the current span.

pub fn enabled(&self, metadata: &Metadata) -> bool

Returns whether the wrapped subscriber would enable the current span.

pub fn event(&self, event: &Event)

Records the provided event with the wrapped subscriber.

Notes

• The subscriber is free to expect that the event's callsite has been registered, and may panic or fail to observe the event if this is not the case. The tracing crate's macros ensure that all events are registered, but if the event is constructed through other means, the user is responsible for ensuring that register_callsite has been called prior to calling this method.
• This does not call enabled on the inner subscriber. If the caller wishes to apply the wrapped subscriber's filter before choosing whether to record the event, it may first call Context::enabled to check whether the event would be enabled. This allows Layers to elide constructing the event if it would not be recorded.

Trait Implementations

impl<'a, S> Clone for Context<'a, S>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a, S: Debug> Debug for Context<'a, S>

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

Formats the value using the given formatter.