add test

Signed-off-by: husharp <jinhao.hu@pingcap.com>

client/http/client.go

@@ -21,7 +21,6 @@ import (
 	"encoding/json"
 	"io"
 	"net/http"
-	"os"
 	"time"
 
 	"github.com/pingcap/errors"
@@ -270,21 +269,6 @@ func WithMetrics(
 	}
 }
 
-// WithLoggerRedirection configures the client with the given logger redirection.
-func WithLoggerRedirection(logLevel, fileName string) ClientOption {
-	cfg := &log.Config{}
-	cfg.Level = logLevel
-	if fileName != "" {
-		f, _ := os.CreateTemp(".", fileName)
-		fname := f.Name()
-		f.Close()
-		cfg.File.Filename = fname
-	}
-	lg, p, _ := log.InitLogger(cfg)
-	log.ReplaceGlobals(lg, p)
-	return func(c *client) {}
-}
-
 // NewClientWithServiceDiscovery creates a PD HTTP client with the given PD service discovery.
 func NewClientWithServiceDiscovery(
 	source string,
@@ -314,6 +298,10 @@ func NewClient(
 		opt(c)
 	}
 	sd := pd.NewDefaultPDServiceDiscovery(ctx, cancel, pdAddrs, c.inner.tlsConf)
+	if err := sd.Init(); err != nil {
+		log.Error("[pd] init service discovery failed", zap.String("source", source), zap.Strings("pd-addrs", pdAddrs), zap.Error(err))
+		return nil
+	}
 	c.inner.init(sd)
 	return c
 }
@@ -371,6 +359,7 @@ func (c *client) request(ctx context.Context, reqInfo *requestInfo, headerOpts .
 		headerOpts...)
 }
 
+/* The following functions are only for test */
 // requestChecker is used to check the HTTP request sent by the client.
 type requestChecker func(req *http.Request) error
 
@@ -385,3 +374,20 @@ func NewHTTPClientWithRequestChecker(checker requestChecker) *http.Client {
 		Transport: checker,
 	}
 }
+
+// newClientWithoutServiceDiscovery creates a PD HTTP client with the given PD addresses and TLS config without service discovery.
+func newClientWithoutServiceDiscovery(
+	source string,
+	pdAddrs []string,
+	opts ...ClientOption,
+) Client {
+	ctx, cancel := context.WithCancel(context.Background())
+	c := &client{inner: newClientInner(ctx, cancel, source), callerID: defaultCallerID}
+	// Apply the options first.
+	for _, opt := range opts {
+		opt(c)
+	}
+	sd := pd.NewDefaultPDServiceDiscovery(ctx, cancel, pdAddrs, c.inner.tlsConf)
+	c.inner.init(sd)
+	return c
+}

client/http/client_test.go

@@ -40,7 +40,7 @@ func TestPDAllowFollowerHandleHeader(t *testing.T) {
 		}
 		return nil
 	})
-	c := NewClient("test-header", []string{"http://127.0.0.1"}, WithHTTPClient(httpClient))
+	c := newClientWithoutServiceDiscovery("test-header", []string{"http://127.0.0.1"}, WithHTTPClient(httpClient))
 	c.GetRegions(context.Background())
 	c.GetHistoryHotRegions(context.Background(), &HistoryHotRegionsRequest{})
 	c.Close()
@@ -58,7 +58,7 @@ func TestCallerID(t *testing.T) {
 		}
 		return nil
 	})
-	c := NewClient("test-caller-id", []string{"http://127.0.0.1"}, WithHTTPClient(httpClient))
+	c := newClientWithoutServiceDiscovery("test-caller-id", []string{"http://127.0.0.1"}, WithHTTPClient(httpClient))
 	c.GetRegions(context.Background())
 	expectedVal.Store("test")
 	c.WithCallerID(expectedVal.Load()).GetRegions(context.Background())
@@ -69,7 +69,7 @@ func TestWithBackoffer(t *testing.T) {
 	re := require.New(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	c := NewClient("test-with-backoffer", []string{"http://127.0.0.1"})
+	c := newClientWithoutServiceDiscovery("test-with-backoffer", []string{"http://127.0.0.1"})
 
 	base := 100 * time.Millisecond
 	max := 500 * time.Millisecond

client/pd_service_discovery.go

@@ -911,7 +911,9 @@ func (c *pdServiceDiscovery) checkServiceModeChanged() error {
 	if clusterInfo == nil || len(clusterInfo.ServiceModes) == 0 {
 		return errors.WithStack(errNoServiceModeReturned)
 	}
-	c.serviceModeUpdateCb(clusterInfo.ServiceModes[0])
+	if c.serviceModeUpdateCb != nil {
+		c.serviceModeUpdateCb(clusterInfo.ServiceModes[0])
+	}
 	return nil
 }