Struct WideEventLayer 

pub struct WideEventLayer<W = Stdout, F = JsonFormatter, T = Rfc3339> { /* private fields */ }

A tracing_subscriber::Layer that writes wide event output.

Timestamp precision is controlled by the FormatTime implementation (default: Rfc3339). Swap it with with_timer:

use wide_event::WideEventLayer;
use tracing_subscriber::fmt::time::Uptime;

tracing_subscriber::registry()
    .with(WideEventLayer::stdout().with_timer(Uptime::default()))
    .init();

Implementations

impl WideEventLayer<Stdout, JsonFormatter, Rfc3339>

pub fn stdout() -> Self

Create a layer that writes JSON wide events to stdout with RFC 3339 timestamps.

impl<W: Write + Send + 'static, F: WideEventFormatter> WideEventLayer<W, F, Rfc3339>

pub fn new(writer: W, formatter: F) -> Self

Create a layer with a custom writer and formatter.

Uses Rfc3339 timestamps by default. Call with_timer to change.

impl<W: Write + Send + 'static, F: WideEventFormatter, T: FormatTime> WideEventLayer<W, F, T>

pub fn with_system(self, system: &'static str) -> Self

Set a process-wide "system" field injected into every wide event.

pub fn with_target_prefix(self, prefix: &'static str) -> Self

Set the target prefix for wide event output.

The actual tracing target is always wide_event (a macro limitation), but the formatted output uses {prefix}::{subsystem} as the subsystem identifier.

pub fn with_timer<T2: FormatTime>(self, timer: T2) -> WideEventLayer<W, F, T2>

Set the timestamp formatter.

Accepts any FormatTime implementation from tracing_subscriber::fmt::time.

Trait Implementations

impl<S, W, F, T> Layer<S> for WideEventLayer<W, F, T>

where S: Subscriber + for<'a> LookupSpan<'a>, W: Write + Send + 'static, F: WideEventFormatter + 'static, T: FormatTime + Send + Sync + 'static,

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

Notifies this layer that an event has occurred.

fn on_register_dispatch(&self, subscriber: &Dispatch)

Performs late initialization when installing this layer as a Subscriber.

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_new_span(&self, attrs: &Attributes<'_>, id: &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_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_enter(&self, _id: &Id, _ctx: Context<'_, S>)

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

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

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

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

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

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

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

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

where L: Layer<S>, Self: Sized,

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

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

where Self: Sized,

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 Self: Sized, F: Filter<S>,

Combines self with a Filter, returning a Filtered layer.

fn boxed(self) -> Box<dyn Layer<S> + Send + Sync>

where Self: Sized + Layer<S> + Send + Sync + 'static, S: Subscriber,

Erases the type of this Layer, returning a Boxed dyn Layer trait object.