118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
// Package etcd...
|
||
//
|
||
// Description : 监听key的变化
|
||
//
|
||
// Author : go_developer@163.com<白茶清欢>
|
||
//
|
||
// Date : 2021-11-23 2:58 下午
|
||
package etcd
|
||
|
||
import (
|
||
"context"
|
||
"math"
|
||
"time"
|
||
)
|
||
|
||
// WatchKey 监听key的变化,永久监听
|
||
//
|
||
// Author : go_developer@163.com<白茶清欢>
|
||
//
|
||
// Date : 2:58 下午 2021/11/23
|
||
func WatchKey(ctx context.Context, watchKey string, callbackFunc WatcherHandler) {
|
||
if nil == callbackFunc {
|
||
// 变化之后,没有任何逻辑处理,视为不需要监听变化
|
||
return
|
||
}
|
||
if nil == ctx {
|
||
ctx = context.Background()
|
||
}
|
||
|
||
rch := Client.Watch(ctx, watchKey) // <-chan WatchResponse
|
||
for watchResp := range rch {
|
||
for _, ev := range watchResp.Events {
|
||
callbackFunc(ev)
|
||
}
|
||
}
|
||
}
|
||
|
||
// WatchKeyWithCancel 可以随时取消的
|
||
//
|
||
// Author : go_developer@163.com<白茶清欢>
|
||
//
|
||
// Date : 3:16 下午 2021/11/23
|
||
func WatchKeyWithCancel(ctx context.Context, watchKey string, callbackFunc WatcherHandler, cancelChan chan interface{}, cancelDealFunc CancelWatcherHandler) {
|
||
if nil == callbackFunc {
|
||
// 变化之后,没有任何逻辑处理,视为不需要监听变化
|
||
return
|
||
}
|
||
if nil == ctx {
|
||
ctx = context.Background()
|
||
}
|
||
var (
|
||
cancelFunc context.CancelFunc
|
||
)
|
||
ctx, cancelFunc = context.WithCancel(ctx)
|
||
defer cancelFunc()
|
||
|
||
rch := Client.Watch(context.Background(), watchKey) // <-chan WatchResponse
|
||
|
||
hasFinish := false
|
||
for {
|
||
select {
|
||
case cancelData := <-cancelChan:
|
||
if nil != cancelDealFunc {
|
||
cancelDealFunc(watchKey, cancelData)
|
||
}
|
||
hasFinish = true
|
||
case watchResp := <-rch:
|
||
for _, ev := range watchResp.Events {
|
||
callbackFunc(ev)
|
||
}
|
||
}
|
||
if hasFinish {
|
||
break
|
||
}
|
||
}
|
||
}
|
||
|
||
// WatchKeyOnce 监听一次key
|
||
//
|
||
// timeout 若 <= 0 , 则会一直等待当前key发生变化为止
|
||
//
|
||
// timeout 若 > 0 , 则在制定时间内为监听到变化, 立即自动取消,
|
||
//
|
||
// Author : go_developer@163.com<白茶清欢>
|
||
//
|
||
// Date : 4:35 下午 2021/11/23
|
||
func WatchKeyOnce(ctx context.Context, watchKey string, callbackFunc WatcherHandler, timeout time.Duration, timeoutHandler TimeoutWatcherHandler) {
|
||
if nil == callbackFunc {
|
||
// 变化之后,没有任何逻辑处理,视为不需要监听变化
|
||
return
|
||
}
|
||
|
||
if timeout == 0 {
|
||
// 不指定超时时间，默认设置成int64最大值
|
||
timeout = math.MaxInt16 * time.Second
|
||
}
|
||
|
||
if nil == ctx {
|
||
ctx = context.Background()
|
||
}
|
||
var (
|
||
cancelFunc context.CancelFunc
|
||
)
|
||
ctx, cancelFunc = context.WithCancel(ctx)
|
||
defer cancelFunc()
|
||
rch := Client.Watch(ctx, watchKey) // <-chan WatchResponse
|
||
select {
|
||
case <-time.After(timeout):
|
||
if nil != timeoutHandler {
|
||
timeoutHandler(watchKey, timeout)
|
||
}
|
||
case watchResp := <-rch:
|
||
for _, ev := range watchResp.Events {
|
||
callbackFunc(ev)
|
||
}
|
||
}
|
||
}
|