feat: add metrics (#3624)

rest/httpc/internal/metricsinterceptor_test.go

@@ -0,0 +1,35 @@
+package internal
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+func TestMetricsInterceptor(t *testing.T) {
+	c := gomock.NewController(t)
+	defer c.Finish()
+
+	logx.Disable()
+
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		time.Sleep(100 * time.Millisecond)
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	defer svr.Close()
+
+	req, err := http.NewRequest(http.MethodGet, svr.URL, nil)
+	assert.NotNil(t, req)
+	assert.Nil(t, err)
+	interceptor := MetricsInterceptor("test", nil)
+	req, handler := interceptor(req)
+	resp, err := http.DefaultClient.Do(req)
+	assert.NotNil(t, resp)
+	assert.Nil(t, err)
+	handler(resp, err)
+}