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