feat(trace): support for disabling tracing of specified spanName (#2363)

rest/handler/tracinghandler_test.go

@@ -51,3 +51,46 @@ func TestOtelHandler(t *testing.T) {
 		})
 	}
 }
+
+func TestDontTracingSpanName(t *testing.T) {
+	ztrace.StartAgent(ztrace.Config{
+		Name:     "go-zero-test",
+		Endpoint: "http://localhost:14268/api/traces",
+		Batcher:  "jaeger",
+		Sampler:  1.0,
+	})
+
+	DontTracingSpanName("bar")
+
+	for _, test := range []string{"", "bar", "foo"} {
+		t.Run(test, func(t *testing.T) {
+			h := chain.New(TracingHandler("foo", test)).Then(
+				http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+					spanCtx := trace.SpanContextFromContext(r.Context())
+					if test == "bar" {
+						assert.False(t, spanCtx.IsValid())
+						return
+					}
+
+					assert.True(t, spanCtx.IsValid())
+				}))
+			ts := httptest.NewServer(h)
+			defer ts.Close()
+
+			client := ts.Client()
+			err := func(ctx context.Context) error {
+				ctx, span := otel.Tracer("httptrace/client").Start(ctx, "test")
+				defer span.End()
+
+				req, _ := http.NewRequest("GET", ts.URL, nil)
+				otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(req.Header))
+
+				res, err := client.Do(req)
+				assert.Nil(t, err)
+				return res.Body.Close()
+			}(context.Background())
+
+			assert.Nil(t, err)
+		})
+	}
+}