Struct WithContextFields 

pub struct WithContextFields<F> { /* private fields */ }

A FormatEvent wrapper that enriches log events with context values.

Wraps an inner formatter and prepends context fields to every log line. Fields are discovered lazily from registry metadata on first use.

Example

use tracing_subscriber::prelude::*;
use dcontext_tracing::WithContextFields;

tracing_subscriber::registry()
    .with(dcontext_tracing::DcontextLayer::new())
    .with(tracing_subscriber::fmt::layer()
        .event_format(WithContextFields::wrap(
            tracing_subscriber::fmt::format().without_time()
        )))
    .init();

Implementations

impl<F> WithContextFields<F>

pub fn wrap(inner: F) -> Self

Wrap an inner formatter with context field enrichment.

Fields are discovered lazily from the registry on first log event. Safe to call before initialize() — discovery happens on first use.

Trait Implementations

impl<S, N, F> FormatEvent<S, N> for WithContextFields<F>

where F: FormatEvent<S, N>, S: Subscriber + for<'a> LookupSpan<'a>, N: for<'writer> FormatFields<'writer> + 'static,

fn format_event( &self, ctx: &FmtContext<'_, S, N>, writer: Writer<'_>, event: &Event<'_>, ) -> Result

Write a log message for Event in FmtContext to the given Writer.