| // 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/coreos/etcd/clientv3" |
| "github.com/spf13/cobra" |
| ) |
| |
| // 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 { |
| ExitWithError(ExitBadArgs, fmt.Errorf("move-leader command needs 1 argument")) |
| } |
| target, err := strconv.ParseUint(args[0], 16, 64) |
| if err != nil { |
| ExitWithError(ExitBadArgs, err) |
| } |
| |
| c := mustClientFromCmd(cmd) |
| eps := c.Endpoints() |
| c.Close() |
| |
| ctx, cancel := commandCtx(cmd) |
| |
| // find current leader |
| var leaderCli *clientv3.Client |
| var leaderID uint64 |
| for _, ep := range eps { |
| cfg := clientConfigFromCmd(cmd) |
| cfg.endpoints = []string{ep} |
| cli := cfg.mustClient() |
| resp, serr := cli.Status(ctx, ep) |
| if serr != nil { |
| ExitWithError(ExitError, serr) |
| } |
| |
| if resp.Header.GetMemberId() == resp.Leader { |
| leaderCli = cli |
| leaderID = resp.Leader |
| break |
| } |
| cli.Close() |
| } |
| if leaderCli == nil { |
| ExitWithError(ExitBadArgs, fmt.Errorf("no leader endpoint given at %v", eps)) |
| } |
| |
| var resp *clientv3.MoveLeaderResponse |
| resp, err = leaderCli.MoveLeader(ctx, target) |
| cancel() |
| if err != nil { |
| ExitWithError(ExitError, err) |
| } |
| |
| display.MoveLeader(leaderID, target, *resp) |
| } |