chore(trace): improve rest tracinghandler (#2783)

rest/handler/tracinghandler.go

@@ -31,7 +31,7 @@ func TracingHandler(serviceName, path string, opts ...TracingOption) func(http.H
 
 	ignorePaths := collection.NewSet()
 	ignorePaths.AddStr(tracingOpts.traceIgnorePaths...)
-
+	traceHandler := func(checkIgnore bool) func(http.Handler) http.Handler {
 		return func(next http.Handler) http.Handler {
 			propagator := otel.GetTextMapPropagator()
 			tracer := otel.GetTracerProvider().Tracer(trace.TraceName)
@@ -42,7 +42,7 @@ func TracingHandler(serviceName, path string, opts ...TracingOption) func(http.H
 					spanName = r.URL.Path
 				}
 
-			if ignorePaths.Contains(spanName) {
+				if checkIgnore && ignorePaths.Contains(spanName) {
 					next.ServeHTTP(w, r)
 					return
 				}
@@ -67,11 +67,14 @@ func TracingHandler(serviceName, path string, opts ...TracingOption) func(http.H
 				span.SetStatus(semconv.SpanStatusFromHTTPStatusCodeAndSpanKind(trw.Code, oteltrace.SpanKindServer))
 			})
 		}
+	}
+	checkIgnore := ignorePaths.Count() > 0
+	return traceHandler(checkIgnore)
 }
 
 // WithTraceIgnorePaths specifies the traceIgnorePaths option for TracingHandler.
 func WithTraceIgnorePaths(traceIgnorePaths []string) TracingOption {
 	return func(options *tracingOptions) {
-		options.traceIgnorePaths = traceIgnorePaths
+		options.traceIgnorePaths = append(options.traceIgnorePaths, traceIgnorePaths...)
 	}
 }