Class NextTracerImpl

packages/next/src/server/lib/trace/tracer.ts:202–509

}

class NextTracerImpl implements NextTracer {
  /**
   * Returns an instance to the trace with configured name.
   * Since wrap / trace can be defined in any place prior to actual trace subscriber initialization,
   * This should be lazily evaluated.
   */
  private getTracerInstance(): Tracer {
    return trace.getTracer('next.js', '0.0.1')
  }

  public getContext(): ContextAPI {
    return context
  }

  public getTracePropagationData(): ClientTraceDataEntry[] {
    const activeContext = context.active()
    const entries: ClientTraceDataEntry[] = []
    propagation.inject(activeContext, entries, clientTraceDataSetter)
    return entries
  }

  public getActiveScopeSpan(): Span | undefined {
    return trace.getSpan(context?.active())
  }

  public withPropagatedContext<T, C>(
    carrier: C,
    fn: () => T,
    getter?: TextMapGetter<C>,
    force = false
  ): T {
    const activeContext = context.active()

    if (force) {
      const remoteContext = propagation.extract(ROOT_CONTEXT, carrier, getter)

      if (trace.getSpanContext(remoteContext)) {
        return context.with(remoteContext, fn)
      }

      // Preserve the current active span while still merging any extracted
      // baggage/context values from the carrier.
      const mergedContext = propagation.extract(activeContext, carrier, getter)
      return context.with(mergedContext, fn)
    }

    if (trace.getSpanContext(activeContext)) {
      // Active span is already set, too late to propagate.
      return fn()
    }

    const remoteContext = propagation.extract(activeContext, carrier, getter)
    return context.with(remoteContext, fn)
  }

  // Trace, wrap implementation is inspired by datadog trace implementation
  // (https://datadoghq.dev/dd-trace-js/interfaces/tracer.html#trace).
  public trace<T>(