示例#1
0
// JoinOrNew creates a new Span joined to the provided DelegatingCarrier or
// creates Span from the given tracer.
func JoinOrNew(tr opentracing.Tracer, carrier *Span, opName string) (opentracing.Span, error) {
	if carrier != nil {
		sp, err := tr.Join(opName, basictracer.Delegator, carrier)
		switch err {
		case nil:
			sp.LogEvent(opName)
			return sp, nil
		case opentracing.ErrTraceNotFound:
		default:
			return nil, err
		}
	}
	return tr.StartSpan(opName), nil
}
示例#2
0
func TestTracer(t *testing.T) {
	log.SetFlags(0)

	var tracer ot.Tracer
	tracer = &Tracer{}
	ot.InitGlobalTracer(tracer)

	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		serverSpan, err := tracer.Join(
			"serverSpan",
			ot.TextMap,
			ot.HTTPHeaderTextMapCarrier(r.Header))
		if err != nil {
			panic(err)
		}
		time.Sleep(time.Second * 1)
		serverSpan.Finish()
		fmt.Fprintln(w, "Hello, client")
	}))
	defer ts.Close()

	span, nctx := ot.StartSpanFromContext(context.TODO(), "main_test")
	defer span.Finish()

	foo(nctx, "bar", 0)

	httpClient := &http.Client{}
	httpReq, _ := http.NewRequest("GET", ts.URL, nil)

	// Transmit the span's TraceContext as HTTP headers on our
	// outbound request.
	tracer.Inject(
		span,
		ot.TextMap,
		ot.HTTPHeaderTextMapCarrier(httpReq.Header))

	if _, err := httpClient.Do(httpReq); err != nil {
		panic(err)
	}
}