github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/pdutil/utils.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package pdutil
    15  
    16  import (
    17  	"context"
    18  	"strconv"
    19  
    20  	"github.com/pingcap/log"
    21  	"github.com/pingcap/tiflow/pkg/config"
    22  	cerror "github.com/pingcap/tiflow/pkg/errors"
    23  	pd "github.com/tikv/pd/client"
    24  	"go.uber.org/zap"
    25  )
    26  
    27  const sourceIDName = "source_id"
    28  
    29  // GetSourceID returns the source ID of the TiDB cluster that PD is belonged to.
    30  func GetSourceID(ctx context.Context, pdClient pd.Client) (uint64, error) {
    31  	// only nil in test case
    32  	if pdClient == nil {
    33  		return config.DefaultTiDBSourceID, nil
    34  	}
    35  	// The default value of sourceID is 1,
    36  	// which means the sourceID is not changed by user.
    37  	sourceID := uint64(1)
    38  	sourceIDConfig, _, err := pdClient.LoadGlobalConfig(ctx, []string{sourceIDName}, "")
    39  	if err != nil {
    40  		return 0, cerror.WrapError(cerror.ErrPDEtcdAPIError, err)
    41  	}
    42  	if len(sourceIDConfig) != 0 && sourceIDConfig[0].Value != "" {
    43  		sourceID, err = strconv.ParseUint(sourceIDConfig[0].Value, 10, 64)
    44  		if err != nil {
    45  			log.Error("fail to parse sourceID from PD",
    46  				zap.String("sourceID", sourceIDConfig[0].Value),
    47  				zap.Error(err))
    48  			return 0, cerror.WrapError(cerror.ErrPDEtcdAPIError, err)
    49  		}
    50  	}
    51  	return sourceID, nil
    52  }