traefik/pkg/middlewares/tracing/entrypoint.go
2024-01-08 09:10:06 +01:00

57 lines
1.6 KiB
Go

package tracing
import (
"context"
"net/http"
"github.com/containous/alice"
"github.com/traefik/traefik/v3/pkg/middlewares"
"github.com/traefik/traefik/v3/pkg/tracing"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
const (
entryPointTypeName = "TracingEntryPoint"
)
type entryPointTracing struct {
tracer trace.Tracer
entryPoint string
next http.Handler
}
// WrapEntryPointHandler Wraps tracing to alice.Constructor.
func WrapEntryPointHandler(ctx context.Context, tracer trace.Tracer, entryPointName string) alice.Constructor {
return func(next http.Handler) (http.Handler, error) {
return newEntryPoint(ctx, tracer, entryPointName, next), nil
}
}
// newEntryPoint creates a new tracing middleware for incoming requests.
func newEntryPoint(ctx context.Context, tracer trace.Tracer, entryPointName string, next http.Handler) http.Handler {
middlewares.GetLogger(ctx, "tracing", entryPointTypeName).Debug().Msg("Creating middleware")
return &entryPointTracing{
entryPoint: entryPointName,
tracer: tracer,
next: next,
}
}
func (e *entryPointTracing) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
tracingCtx := tracing.ExtractCarrierIntoContext(req.Context(), req.Header)
tracingCtx, span := e.tracer.Start(tracingCtx, "EntryPoint", trace.WithSpanKind(trace.SpanKindServer))
defer span.End()
req = req.WithContext(tracingCtx)
span.SetAttributes(attribute.String("entry_point", e.entryPoint))
tracing.LogServerRequest(span, req)
recorder := newStatusCodeRecorder(rw, http.StatusOK)
e.next.ServeHTTP(recorder, req)
tracing.LogResponseCode(span, recorder.Status(), trace.SpanKindServer)
}