mirror of
https://gitee.com/rainbond/Rainbond.git
synced 2024-12-04 04:38:04 +08:00
79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
// Copyright (C) 2014-2018 Goodrain Co., Ltd.
|
|
// RAINBOND, Application Management Platform
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version. For any non-GPL usage of Rainbond,
|
|
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
|
|
// must be obtained first.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package etcd
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/coreos/etcd/clientv3"
|
|
"github.com/coreos/etcd/mvcc/mvccpb"
|
|
"github.com/sirupsen/logrus"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
//ErrNoUpdateForLongTime no update for long time , can reobservation of synchronous data
|
|
var ErrNoUpdateForLongTime = fmt.Errorf("not updated for a long time")
|
|
|
|
//WaitPrefixEvents WaitPrefixEvents
|
|
func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
logrus.Debug("start watch message from etcd queue")
|
|
wc := clientv3.NewWatcher(c).Watch(ctx, prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
|
|
if wc == nil {
|
|
return nil, ErrNoWatcher
|
|
}
|
|
event := waitEvents(wc, evs)
|
|
if event != nil {
|
|
return event, nil
|
|
}
|
|
logrus.Debug("queue watcher sync, because of not updated for a long time")
|
|
return nil, ErrNoUpdateForLongTime
|
|
}
|
|
|
|
//waitEvents this will return nil
|
|
func waitEvents(wc clientv3.WatchChan, evs []mvccpb.Event_EventType) *clientv3.Event {
|
|
i := 0
|
|
timer := time.NewTimer(time.Second * 30)
|
|
defer timer.Stop()
|
|
for {
|
|
select {
|
|
case wresp := <-wc:
|
|
if wresp.Err() != nil {
|
|
logrus.Errorf("watch event failure %s", wresp.Err().Error())
|
|
return nil
|
|
}
|
|
if len(wresp.Events) == 0 {
|
|
return nil
|
|
}
|
|
for _, ev := range wresp.Events {
|
|
if ev.Type == evs[i] {
|
|
i++
|
|
if i == len(evs) {
|
|
return ev
|
|
}
|
|
}
|
|
}
|
|
case <-timer.C:
|
|
return nil
|
|
}
|
|
}
|
|
}
|