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77 lines
2.5 KiB
77 lines
2.5 KiB
package tracing
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import (
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"context"
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"net/http"
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"testing"
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"github.com/go-kratos/kratos/v2/transport"
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"go.opentelemetry.io/otel/propagation"
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tracesdk "go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/trace"
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)
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var (
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_ transport.Transporter = &Transport{}
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)
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type headerCarrier http.Header
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// Get returns the value associated with the passed key.
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func (hc headerCarrier) Get(key string) string {
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return http.Header(hc).Get(key)
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}
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// Set stores the key-value pair.
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func (hc headerCarrier) Set(key string, value string) {
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http.Header(hc).Set(key, value)
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}
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// Keys lists the keys stored in this carrier.
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func (hc headerCarrier) Keys() []string {
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keys := make([]string, 0, len(hc))
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for k := range http.Header(hc) {
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keys = append(keys, k)
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}
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return keys
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}
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type Transport struct {
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kind transport.Kind
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endpoint string
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operation string
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header headerCarrier
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}
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func (tr *Transport) Kind() transport.Kind { return tr.kind }
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func (tr *Transport) Endpoint() string { return tr.endpoint }
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func (tr *Transport) Operation() string { return tr.operation }
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func (tr *Transport) RequestHeader() transport.Header { return tr.header }
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func (tr *Transport) ReplyHeader() transport.Header { return tr.header }
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func TestTracing(t *testing.T) {
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var carrier = headerCarrier{}
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tp := tracesdk.NewTracerProvider(tracesdk.WithSampler(tracesdk.TraceIDRatioBased(0)))
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// caller use Inject
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tracer := NewTracer(trace.SpanKindClient, WithTracerProvider(tp), WithPropagator(propagation.NewCompositeTextMapPropagator(propagation.Baggage{}, propagation.TraceContext{})))
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ts := &Transport{kind: transport.KindHTTP, header: carrier}
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ctx, aboveSpan := tracer.Start(transport.NewClientContext(context.Background(), ts), ts.Operation(), ts.RequestHeader())
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defer tracer.End(ctx, aboveSpan, nil, nil)
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// server use Extract fetch traceInfo from carrier
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tracer = NewTracer(trace.SpanKindServer, WithPropagator(propagation.NewCompositeTextMapPropagator(propagation.Baggage{}, propagation.TraceContext{})))
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ts = &Transport{kind: transport.KindHTTP, header: carrier}
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ctx, span := tracer.Start(transport.NewServerContext(ctx, ts), ts.Operation(), ts.RequestHeader())
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defer tracer.End(ctx, span, nil, nil)
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if aboveSpan.SpanContext().TraceID() != span.SpanContext().TraceID() {
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t.Fatalf("TraceID failed to deliver")
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}
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if v, ok := transport.FromClientContext(ctx); !ok || len(v.RequestHeader().Keys()) == 0 {
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t.Fatalf("traceHeader failed to deliver")
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}
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}
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