Struct tracing_web::PerformanceEventsLayer

pub struct PerformanceEventsLayer<S, N = ()> { /* private fields */ }

A Layer that emits span enter, exit and events as performance marks.

Implementations

impl<S, N> PerformanceEventsLayer<S, N>

pub fn with_details_from_fields<N2>(
    self,
    fmt_fields: N2
) -> PerformanceEventsLayer<S, FormatSpanFromFields<N2>> where
    N2: 'static + for<'writer> FormatFields<'writer>, 

Change the way additional details are attached to performance events.

The given FormatFields is used to format a string that is attached to each event. See the tracing_subscriber::fmt::format module for an assortment of available formatters.

pub fn with_details<N2: FormatSpan>(
    self,
    fmt_details: N2
) -> PerformanceEventsLayer<S, N2>

Change the way additional details are attached to performance events.

See also with_details_from_fields for compatibility with tracing_subscriber::fmt::format.

Trait Implementations

impl<S, N> Layer<S> for PerformanceEventsLayer<S, N> where
    S: Subscriber + for<'lookup> LookupSpan<'lookup>,
    N: FormatSpan, 

fn on_new_span(&self, attrs: &Attributes<'_>, span: &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_enter(&self, span: &Id, ctx: Context<'_, S>)

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

fn on_exit(&self, span: &Id, ctx: Context<'_, S>)

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

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

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

fn on_layer(&mut self, subscriber: &mut S)

Performs late initialization when attaching a Layer to a Subscriber.

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<'_>, ctx: 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 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 event_enabled(&self, _event: &Event<'_>, _ctx: Context<'_, S>) -> bool

Called before on_event, to determine if on_event should be called.

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

Notifies this layer that an event has occurred.

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

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

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

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

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

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

fn with_filter<F>(self, filter: F) -> Filtered<Self, F, S> where
    F: Filter<S>, 

Combines self with a Filter, returning a Filtered layer.