Interface Tracer

Tracer provides an interface for creating Spans.

Since

1.0.0

interface Tracer {
    startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        fn: F,
    ): ReturnType<F>;
    startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        options: SpanOptions,
        fn: F,
    ): ReturnType<F>;
    startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        options: SpanOptions,
        context: Context,
        fn: F,
    ): ReturnType<F>;
    startSpan(name: string, options?: SpanOptions, context?: Context): Span;
}

Implemented by

Methods

startActiveSpan startSpan

Methods

startActiveSpan

  • startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        fn: F,
    ): ReturnType<F>

    Starts a new Span and calls the given function passing it the created span as first argument. Additionally the new span gets set in context and this context is activated for the duration of the function call.

    Type Parameters

    • F extends (span: Span) => unknown

    Parameters

    • name: string

      The name of the span

    • fn: F

      function called in the context of the span and receives the newly created span as an argument

    Returns ReturnType<F>

    return value of fn

    Example

    const something = tracer.startActiveSpan('op', span => {
          try {
            do some work
            span.setStatus({code: SpanStatusCode.OK});
            return something;
          } catch (err) {
            span.setStatus({
              code: SpanStatusCode.ERROR,
              message: err.message,
            });
            throw err;
          } finally {
            span.end();
          }
        });

    Example

    const span = tracer.startActiveSpan('op', span => {
          try {
            do some work
            return span;
          } catch (err) {
            span.setStatus({
              code: SpanStatusCode.ERROR,
              message: err.message,
            });
            throw err;
          }
        });
        do some more work
        span.end();
  • startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        options: SpanOptions,
        fn: F,
    ): ReturnType<F>

    Type Parameters

    • F extends (span: Span) => unknown

    Parameters

    Returns ReturnType<F>

  • startActiveSpan<F extends (span: Span) => unknown>(
        name: string,
        options: SpanOptions,
        context: Context,
        fn: F,
    ): ReturnType<F>

    Type Parameters

    • F extends (span: Span) => unknown

    Parameters

    Returns ReturnType<F>

startSpan

  • startSpan(name: string, options?: SpanOptions, context?: Context): Span

    Starts a new Span. Start the span without setting it on context.

    This method do NOT modify the current Context.

    Parameters

    • name: string

      The name of the span

    • Optionaloptions: SpanOptions

      SpanOptions used for span creation

    • Optionalcontext: Context

      Context to use to extract parent

    Returns Span

    Span The newly created span

    Example

    const span = tracer.startSpan('op');
        span.setAttribute('key', 'value');
        span.end();

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