Function get_otel_context 

pub fn get_otel_context(
    extensions: &mut ExtensionsMut<'_>,
    dispatch: &Dispatch,
) -> Option<Context>

Utility functions to allow tracing ExtensionsMuts to return OpenTelemetry Contexts.

Extracts the OpenTelemetry Context associated with this span extensions.

This method retrieves the OpenTelemetry context data that has been stored for the span by the OpenTelemetry layer. The context includes the span’s OpenTelemetry span context, which contains trace ID, span ID, and other trace-related metadata.

Examples

use tracing_opentelemetry::get_otel_context;
use tracing::dispatcher::WeakDispatch;
use tracing_subscriber::registry::LookupSpan;
use opentelemetry::trace::TraceContextExt;

fn do_things_with_otel_context<'a, D>(
    span_ref: &tracing_subscriber::registry::SpanRef<'a, D>,
    weak_dispatch: &WeakDispatch
) where
    D: LookupSpan<'a>,
{
    if let Some(dispatch) = weak_dispatch.upgrade() {
        if let Some(otel_context) = get_otel_context(&mut span_ref.extensions_mut(), &dispatch) {
            // Process the extracted context
            let span = otel_context.span();
            let span_context = span.span_context();
            if span_context.is_valid() {
                // Handle the valid context...
            }
        }
    }
}

Use Cases

• When working with multiple subscriber configurations
• When implementing advanced tracing middleware that manages multiple dispatches