add log in session (#6136)

Signed-off-by: Nyefu.chen <yefu.chen@zilliz.com>

internal/util/sessionutil/session_util.go

@@ -60,6 +60,7 @@ func NewSession(ctx context.Context, metaRoot string, etcdEndpoints []string) *S
 	}
 
 	connectEtcdFn := func() error {
+		log.Debug("Session try to connect to etcd")
 		etcdCli, err := clientv3.New(clientv3.Config{Endpoints: etcdEndpoints, DialTimeout: 5 * time.Second})
 		if err != nil {
 			return err
@@ -71,6 +72,7 @@ func NewSession(ctx context.Context, metaRoot string, etcdEndpoints []string) *S
 	if err != nil {
 		return nil
 	}
+	log.Debug("Sessiont connect to etcd success")
 	return session
 }
 
@@ -109,40 +111,40 @@ func (s *Session) checkIDExist() {
 }
 
 func (s *Session) getServerIDWithKey(key string, retryTimes uint) (int64, error) {
-	res := int64(0)
-	getServerIDWithKeyFn := func() error {
+	for {
+		log.Debug("Session try to get servdeID")
 		getResp, err := s.etcdCli.Get(s.ctx, path.Join(s.metaRoot, DefaultServiceRoot, key))
 		if err != nil {
-			return nil
+			log.Debug("Session get etcd key error", zap.String("key", key), zap.Error(err))
+			return -1, err
 		}
 		if getResp.Count <= 0 {
-			return fmt.Errorf("there is no value on key = %s", key)
+			log.Debug("Session there is no value", zap.String("key", key))
+			continue
 		}
 		value := string(getResp.Kvs[0].Value)
 		valueInt, err := strconv.ParseInt(value, 10, 64)
 		if err != nil {
-			log.Debug("session", zap.Error(err))
-			return err
+			log.Debug("Session ParseInt error", zap.String("value", value), zap.Error(err))
+			continue
 		}
 		txnResp, err := s.etcdCli.Txn(s.ctx).If(
 			clientv3.Compare(
-				clientv3.Value(path.Join(s.metaRoot, DefaultServiceRoot, DefaultIDKey)),
+				clientv3.Value(path.Join(s.metaRoot, DefaultServiceRoot, key)),
 				"=",
 				value)).
-			Then(clientv3.OpPut(path.Join(s.metaRoot, DefaultServiceRoot, DefaultIDKey), strconv.FormatInt(valueInt+1, 10))).Commit()
+			Then(clientv3.OpPut(path.Join(s.metaRoot, DefaultServiceRoot, key), strconv.FormatInt(valueInt+1, 10))).Commit()
 		if err != nil {
-			return err
+			log.Debug("Session Txn failed", zap.String("key", key), zap.Error(err))
+			return -1, err
 		}
 
 		if !txnResp.Succeeded {
-			return fmt.Errorf("function CompareAndSwap error for compare is false for key: %s", key)
+			log.Debug("Session Txn unsuccess", zap.String("key", key))
+			continue
 		}
-		res = valueInt
-		return nil
+		return valueInt, nil
 	}
-
-	err := retry.Do(s.ctx, getServerIDWithKeyFn, retry.Attempts(retryTimes), retry.Sleep(500*time.Millisecond))
-	return res, err
 }
 
 // registerService registers the service to etcd so that other services