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https://gitee.com/rainbond/Rainbond.git
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75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// Copyright (C) 2014-2018 Goodrain Co., Ltd.
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// RAINBOND, Application Management Platform
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package etcd
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import (
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"github.com/coreos/etcd/clientv3"
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"github.com/coreos/etcd/mvcc/mvccpb"
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"golang.org/x/net/context"
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)
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// WaitEvents waits on a key until it observes the given events and returns the final one.
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func WaitEvents(c *clientv3.Client, key string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wc := c.Watch(ctx, key, clientv3.WithRev(rev))
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if wc == nil {
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return nil, ErrNoWatcher
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}
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return waitEvents(wc, evs), nil
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}
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//WatchPrefixEvents watch prefix
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func WatchPrefixEvents(c *clientv3.Client, prefix string, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wc := c.Watch(ctx, prefix, clientv3.WithPrefix())
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if wc == nil {
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return nil, ErrNoWatcher
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}
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return waitEvents(wc, evs), nil
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}
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//WaitPrefixEvents WaitPrefixEvents
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func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []mvccpb.Event_EventType) (*clientv3.Event, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wc := c.Watch(ctx, prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
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if wc == nil {
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return nil, ErrNoWatcher
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}
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return waitEvents(wc, evs), nil
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}
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//waitEvents this will return nil
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func waitEvents(wc clientv3.WatchChan, evs []mvccpb.Event_EventType) *clientv3.Event {
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i := 0
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for wresp := range wc {
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for _, ev := range wresp.Events {
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if ev.Type == evs[i] {
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i++
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if i == len(evs) {
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return ev
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}
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}
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}
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}
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return nil
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}
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