/
failover.go
55 lines (47 loc) · 1.01 KB
/
failover.go
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package main
import (
"fmt"
log "github.com/ngaut/logging"
"github.com/ngaut/zkhelper"
"github.com/siddontang/xcodis/models"
"github.com/siddontang/xcodis/utils"
)
func Promote(oldMaster string, newMaster string) error {
conn, _ := zkhelper.ConnectToZk(*zkAddr)
defer conn.Close()
groups, err := models.ServerGroups(conn, *productName)
if err != nil {
return err
}
var groupId int
found := false
for _, group := range groups {
for _, server := range group.Servers {
if server.Addr == oldMaster {
groupId = group.Id
found = true
break
}
}
}
if !found {
return fmt.Errorf("can not find %s in any groups", oldMaster)
}
lock := utils.GetZkLock(conn, *productName)
lock.Lock(fmt.Sprintf("promote server %+v", newMaster))
defer func() {
err := lock.Unlock()
if err != nil {
log.Warning(err)
}
}()
group, err := models.GetGroup(conn, *productName, groupId)
if err != nil {
return err
}
err = group.Promote(conn, newMaster)
if err != nil {
return err
}
return nil
}