feat: add tracingHandler

http/rest/generic.go

@@ -59,6 +59,9 @@ func Handle[In any, Out any](fn UnaryFunc[In, Out]) func(w http.ResponseWriter,
 		}
 		_ = render.Render(w, r, APIOK(out))
 	}
+
+	f = tracingHandler(handleName, f)
+
 	return f
 }
 
@@ -106,6 +109,8 @@ func Stream[In any](fn StreamFunc[In]) func(w http.ResponseWriter, r *http.Reque
 			_ = render.Render(w, r, APIError(err))
 		}
 	}
+
+	f = tracingHandler(handleName, f)
 	return f
 }
 

http/rest/metrics.go

@@ -56,14 +56,9 @@ func collectHandleMetrics(funcName, method string, st time.Time, err error) {
 	responseTimeDuration.WithLabelValues(funcName, method, codeStr).Observe(duration)
 }
 
-// TracingHandler
+// tracingHandler
-func tracingHandler(operation string) func(next http.Handler) http.Handler {
+func tracingHandler(operation string, fn func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
-	return func(next http.Handler) http.Handler {
+	return otelhttp.NewHandler(http.HandlerFunc(fn), operation).ServeHTTP
-		fn := func(w http.ResponseWriter, r *http.Request) {
-			next.ServeHTTP(w, r)
-		}
-		return otelhttp.NewHandler(http.HandlerFunc(fn), operation)
-	}
 }
 
 func init() {