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40 lines
1.1 KiB
Go
40 lines
1.1 KiB
Go
package handler
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import (
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"net/http"
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"github.com/zeromicro/go-zero/core/trace"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/propagation"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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oteltrace "go.opentelemetry.io/otel/trace"
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)
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// TracingHandler return a middleware that process the opentelemetry.
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func TracingHandler(serviceName, path string) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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propagator := otel.GetTextMapPropagator()
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tracer := otel.GetTracerProvider().Tracer(trace.TraceName)
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := propagator.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
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spanCtx, span := tracer.Start(
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ctx,
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path,
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oteltrace.WithSpanKind(oteltrace.SpanKindServer),
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oteltrace.WithAttributes(semconv.HTTPServerAttributesFromHTTPRequest(
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serviceName, path, r)...),
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)
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defer span.End()
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// convenient for tracking error messages
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sc := span.SpanContext()
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if sc.HasTraceID() {
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w.Header().Set(trace.TraceIdKey, sc.TraceID().String())
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}
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next.ServeHTTP(w, r.WithContext(spanCtx))
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})
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}
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}
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