Migrate to opentelemetry

pkg/middlewares/tracing/service.go

@@ -0,0 +1,45 @@
+package tracing
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/traefik/traefik/v3/pkg/logs"
+	"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 (
+	serviceTypeName = "TracingService"
+)
+
+type serviceTracing struct {
+	service string
+	next    http.Handler
+}
+
+// NewService creates a new tracing middleware that traces the outgoing requests.
+func NewService(ctx context.Context, service string, next http.Handler) http.Handler {
+	middlewares.GetLogger(ctx, "tracing", serviceTypeName).
+		Debug().Str(logs.ServiceName, service).Msg("Added outgoing tracing middleware")
+
+	return &serviceTracing{
+		service: service,
+		next:    next,
+	}
+}
+
+func (t *serviceTracing) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	if tracer := tracing.TracerFromContext(req.Context()); tracer != nil {
+		tracingCtx, span := tracer.Start(req.Context(), "Service", trace.WithSpanKind(trace.SpanKindInternal))
+		defer span.End()
+
+		req = req.WithContext(tracingCtx)
+
+		span.SetAttributes(attribute.String("traefik.service.name", t.service))
+	}
+
+	t.next.ServeHTTP(rw, req)
+}