b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
// Copyright 2015 PingCAP, Inc.
|
|
//
|
|
// 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package util
|
|
|
|
import (
|
|
"encoding/json"
|
|
"path"
|
|
|
|
"github.com/juju/errors"
|
|
"github.com/ngaut/go-zookeeper/zk"
|
|
"github.com/ngaut/zkhelper"
|
|
)
|
|
|
|
func getLeader(data []byte) (string, error) {
|
|
m := struct {
|
|
Addr string `json:"Addr"`
|
|
}{}
|
|
|
|
err := json.Unmarshal(data, &m)
|
|
if err != nil {
|
|
return "", errors.Trace(err)
|
|
}
|
|
|
|
return m.Addr, nil
|
|
}
|
|
|
|
// getLeaderPath gets the leader path in zookeeper.
|
|
func getLeaderPath(rootPath string) string {
|
|
return path.Join(rootPath, "leader")
|
|
}
|
|
|
|
// func checkLeaderExists(conn zkhelper.Conn) error {
|
|
// // the leader node is not ephemeral, so we may meet no any tso server but leader node
|
|
// // has the data for last closed tso server.
|
|
// // TODO: check children in /candidates, if no child, we will treat it as no leader too.
|
|
|
|
// return nil
|
|
// }
|
|
|
|
// GetLeaderAddr gets the leader tso address in zookeeper for outer use.
|
|
func GetLeader(conn zkhelper.Conn, rootPath string) (string, error) {
|
|
data, _, err := conn.Get(getLeaderPath(rootPath))
|
|
if err != nil {
|
|
return "", errors.Trace(err)
|
|
}
|
|
|
|
// if err != checkLeaderExists(conn); err != nil {
|
|
// return "", errors.Trace(err)
|
|
// }
|
|
|
|
return getLeader(data)
|
|
}
|
|
|
|
// GetWatchLeader gets the leader tso address in zookeeper and returns a watcher for leader change.
|
|
func GetWatchLeader(conn zkhelper.Conn, rootPath string) (string, <-chan zk.Event, error) {
|
|
data, _, watcher, err := conn.GetW(getLeaderPath(rootPath))
|
|
if err != nil {
|
|
return "", nil, errors.Trace(err)
|
|
}
|
|
addr, err := getLeader(data)
|
|
if err != nil {
|
|
return "", nil, errors.Trace(err)
|
|
}
|
|
|
|
// if err != checkLeaderExists(conn); err != nil {
|
|
// return "", errors.Trace(err)
|
|
// }
|
|
|
|
return addr, watcher, nil
|
|
}
|