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migrate_helper.go
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// Copyright 2014 Wandoujia Inc. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package main
import (
"errors"
"strings"
"time"
"github.com/wandoulabs/codis/pkg/models"
"github.com/garyburd/redigo/redis"
_ "github.com/juju/errors"
)
const (
MIGRATE_TIMEOUT = 30000
)
var ErrGroupMasterNotFound = errors.New("group master not found")
var ErrInvalidAddr = errors.New("invalid addr")
var ErrStopMigrateByUser = errors.New("migration stopped by user")
// return: success_count, remain_count, error
// slotsmgrt host port timeout slotnum count
func sendRedisMigrateCmd(c redis.Conn, slotId int, toAddr string) (int, int, error) {
addrParts := strings.Split(toAddr, ":")
if len(addrParts) != 2 {
return -1, -1, ErrInvalidAddr
}
reply, err := redis.Values(c.Do("SLOTSMGRTTAGSLOT", addrParts[0], addrParts[1], MIGRATE_TIMEOUT, slotId))
if err != nil {
return -1, -1, err
}
var succ, remain int
if _, err := redis.Scan(reply, &succ, &remain); err != nil {
return -1, -1, err
}
return succ, remain, nil
}
// Migrator Implement
type CodisSlotMigrator struct{}
func (m *CodisSlotMigrator) Migrate(slot *models.Slot, fromGroup, toGroup int, task *MigrateTask, onProgress func(SlotMigrateProgress)) (err error) {
groupFrom, err := models.GetGroup(task.zkConn, task.productName, fromGroup)
if err != nil {
return err
}
groupTo, err := models.GetGroup(task.zkConn, task.productName, toGroup)
if err != nil {
return err
}
fromMaster, err := groupFrom.Master(task.zkConn)
if err != nil {
return err
}
toMaster, err := groupTo.Master(task.zkConn)
if err != nil {
return err
}
if fromMaster == nil || toMaster == nil {
return ErrGroupMasterNotFound
}
c, err := redis.Dial("tcp", fromMaster.Addr)
if err != nil {
return err
}
defer c.Close()
_, remain, err := sendRedisMigrateCmd(c, slot.Id, toMaster.Addr)
if err != nil {
return err
}
for remain > 0 {
if task.Delay > 0 {
time.Sleep(time.Duration(task.Delay) * time.Millisecond)
}
if task.stopChan != nil {
select {
case <-task.stopChan:
return ErrStopMigrateByUser
default:
}
}
_, remain, err = sendRedisMigrateCmd(c, slot.Id, toMaster.Addr)
if remain >= 0 {
onProgress(SlotMigrateProgress{
SlotId: slot.Id,
FromGroup: fromGroup,
ToGroup: toGroup,
Remain: remain,
})
}
if err != nil {
return err
}
}
return nil
}