mirror of https://github.com/poanetwork/quorum.git
114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library 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 Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
// +build darwin,!ios freebsd linux,!arm64 netbsd solaris windows
|
|
|
|
package accounts
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/logger"
|
|
"github.com/ethereum/go-ethereum/logger/glog"
|
|
"github.com/rjeczalik/notify"
|
|
)
|
|
|
|
type watcher struct {
|
|
ac *addrCache
|
|
starting bool
|
|
running bool
|
|
ev chan notify.EventInfo
|
|
quit chan struct{}
|
|
}
|
|
|
|
func newWatcher(ac *addrCache) *watcher {
|
|
return &watcher{
|
|
ac: ac,
|
|
ev: make(chan notify.EventInfo, 10),
|
|
quit: make(chan struct{}),
|
|
}
|
|
}
|
|
|
|
// starts the watcher loop in the background.
|
|
// Start a watcher in the background if that's not already in progress.
|
|
// The caller must hold 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()
|
|
}()
|
|
|
|
err := notify.Watch(w.ac.keydir, w.ev, notify.All)
|
|
if err != nil {
|
|
glog.V(logger.Detail).Infof("can't watch %s: %v", w.ac.keydir, err)
|
|
return
|
|
}
|
|
defer notify.Stop(w.ev)
|
|
glog.V(logger.Detail).Infof("now watching %s", w.ac.keydir)
|
|
defer glog.V(logger.Detail).Infof("no longer watching %s", w.ac.keydir)
|
|
|
|
w.ac.mu.Lock()
|
|
w.running = true
|
|
w.ac.mu.Unlock()
|
|
|
|
// Wait for file system events and reload.
|
|
// When an event occurs, the reload call is delayed a bit so that
|
|
// multiple events arriving quickly only cause a single reload.
|
|
var (
|
|
debounce = time.NewTimer(0)
|
|
debounceDuration = 500 * time.Millisecond
|
|
inCycle, hadEvent bool
|
|
)
|
|
defer debounce.Stop()
|
|
for {
|
|
select {
|
|
case <-w.quit:
|
|
return
|
|
case <-w.ev:
|
|
if !inCycle {
|
|
debounce.Reset(debounceDuration)
|
|
inCycle = true
|
|
} else {
|
|
hadEvent = true
|
|
}
|
|
case <-debounce.C:
|
|
w.ac.mu.Lock()
|
|
w.ac.reload()
|
|
w.ac.mu.Unlock()
|
|
if hadEvent {
|
|
debounce.Reset(debounceDuration)
|
|
inCycle, hadEvent = true, false
|
|
} else {
|
|
inCycle, hadEvent = false, false
|
|
}
|
|
}
|
|
}
|
|
}
|