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// Copyright 2017 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"fmt"
"strconv"
"github.com/spf13/cobra"
"go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/pkg/v3/cobrautl"
)
// NewMoveLeaderCommand returns the cobra command for "move-leader".
func NewMoveLeaderCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "move-leader <transferee-member-id>",
Short: "Transfers leadership to another etcd cluster member.",
Run: transferLeadershipCommandFunc,
}
return cmd
}
// transferLeadershipCommandFunc executes the "compaction" command.
func transferLeadershipCommandFunc(cmd *cobra.Command, args []string) {
if len(args) != 1 {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("move-leader command needs 1 argument"))
}
target, err := strconv.ParseUint(args[0], 16, 64)
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, err)
}
cfg := clientConfigFromCmd(cmd)
c := cfg.mustClient()
eps := c.Endpoints()
c.Close()
ctx, cancel := commandCtx(cmd)
// find current leader
var leaderCli *clientv3.Client
var leaderID uint64
for _, ep := range eps {
cfg.endpoints = []string{ep}
cli := cfg.mustClient()
resp, serr := cli.Status(ctx, ep)
if serr != nil {
cobrautl.ExitWithError(cobrautl.ExitError, serr)
}
if resp.Header.GetMemberId() == resp.Leader {
leaderCli = cli
leaderID = resp.Leader
break
}
cli.Close()
}
if leaderCli == nil {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("no leader endpoint given at %v", eps))
}
var resp *clientv3.MoveLeaderResponse
resp, err = leaderCli.MoveLeader(ctx, target)
cancel()
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitError, err)
}
display.MoveLeader(leaderID, target, *resp)
}
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