/
watch.go
105 lines (90 loc) · 2.13 KB
/
watch.go
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//<developer>
// <name>linapex 曹一峰</name>
// <email>linapex@163.com</email>
// <wx>superexc</wx>
// <qqgroup>128148617</qqgroup>
// <url>https://jsq.ink</url>
// <role>pku engineer</role>
// <date>2019-03-16 12:09:27</date>
//</624342586072502272>
//+建立达尔文,!iOS Freebsd Linux,!ARM64 NetBSD Solaris
package keystore
import (
"time"
"github.com/ethereum/go-ethereum/log"
"github.com/rjeczalik/notify"
)
type watcher struct {
ac *accountCache
starting bool
running bool
ev chan notify.EventInfo
quit chan struct{}
}
func newWatcher(ac *accountCache) *watcher {
return &watcher{
ac: ac,
ev: make(chan notify.EventInfo, 10),
quit: make(chan struct{}),
}
}
//在后台启动观察程序循环。
//如果尚未进行,请在后台启动观察程序。
//呼叫方必须持有W.AC.MU。
func (w *watcher) start() {
if w.starting || w.running {
return
}
w.starting = true
go w.loop()
}
func (w *watcher) close() {
close(w.quit)
}
func (w *watcher) loop() {
defer func() {
w.ac.mu.Lock()
w.running = false
w.starting = false
w.ac.mu.Unlock()
}()
logger := log.New("path", w.ac.keydir)
if err := notify.Watch(w.ac.keydir, w.ev, notify.All); err != nil {
logger.Trace("Failed to watch keystore folder", "err", err)
return
}
defer notify.Stop(w.ev)
logger.Trace("Started watching keystore folder")
defer logger.Trace("Stopped watching keystore folder")
w.ac.mu.Lock()
w.running = true
w.ac.mu.Unlock()
//等待文件系统事件并重新加载。
//当事件发生时,重新加载调用会延迟一点,以便
//多个事件快速到达只会导致一次重新加载。
var (
debounceDuration = 500 * time.Millisecond
rescanTriggered = false
debounce = time.NewTimer(0)
)
//忽略初始触发器
if !debounce.Stop() {
<-debounce.C
}
defer debounce.Stop()
for {
select {
case <-w.quit:
return
case <-w.ev:
//触发扫描(延迟),如果尚未触发
if !rescanTriggered {
debounce.Reset(debounceDuration)
rescanTriggered = true
}
case <-debounce.C:
w.ac.scanAccounts()
rescanTriggered = false
}
}
}