pass unit test

Signed-off-by: bufferflies <1045931706@qq.com>

go.mod

@@ -179,7 +179,7 @@ require (
 	golang.org/x/crypto v0.1.0 // indirect
 	golang.org/x/image v0.0.0-20200119044424-58c23975cae1 // indirect
 	golang.org/x/mod v0.8.0 // indirect
-	golang.org/x/net v0.9.0 // indirect
+	golang.org/x/net v0.9.0
 	golang.org/x/oauth2 v0.4.0 // indirect
 	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.7.0 // indirect

server/config/store_config.go

@@ -296,10 +296,12 @@ func (s TiKVConfigSource) GetConfig(ctx context.Context, statusAddress string) (
 	}
 	resp, err := s.client.Do(req)
 	if err != nil {
+		cancel()
 		return nil, err
 	}
 	defer resp.Body.Close()
 	body, err := io.ReadAll(resp.Body)
+	cancel()
 	if err != nil {
 		return nil, err
 	}

server/config/store_config_test.go

@@ -17,6 +17,7 @@ package config
 import (
 	"crypto/tls"
 	"encoding/json"
+	"golang.org/x/net/context"
 	"net/http"
 	"testing"
 
@@ -63,15 +64,15 @@ func TestTiKVConfig(t *testing.T) {
 func TestUpdateConfig(t *testing.T) {
 	re := require.New(t)
 	manager := NewTestStoreConfigManager([]string{"tidb.com"})
-	manager.ObserveConfig("tikv.com")
+	manager.ObserveConfig(context.Background(), "tikv.com")
 	re.Equal(uint64(144), manager.GetStoreConfig().GetRegionMaxSize())
 	re.NotEqual(raftStoreV2, manager.GetStoreConfig().GetRegionMaxSize())
-	manager.ObserveConfig("tidb.com")
+	manager.ObserveConfig(context.Background(), "tidb.com")
 	re.Equal(uint64(10), manager.GetStoreConfig().GetRegionMaxSize())
 	re.Equal(raftStoreV2, manager.GetStoreConfig().Engine)
 
 	// case2: the config should not update if config is same expect some ignore field.
-	c, err := manager.source.GetConfig("tidb.com")
+	c, err := manager.source.GetConfig(context.Background(), "tidb.com")
 	re.NoError(err)
 	re.True(manager.GetStoreConfig().Equal(c))