135 lines
3.5 KiB
Go
135 lines
3.5 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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//go:build (darwin && !ios && cgo) || freebsd || (linux && !arm64) || netbsd || solaris
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// +build darwin,!ios,cgo freebsd linux,!arm64 netbsd solaris
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package keystore
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import (
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"os"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/fsnotify/fsnotify"
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)
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type watcher struct {
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ac *accountCache
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running bool // set to true when runloop begins
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runEnded bool // set to true when runloop ends
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starting bool // set to true prior to runloop starting
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quit chan struct{}
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}
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func newWatcher(ac *accountCache) *watcher {
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return &watcher{
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ac: ac,
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quit: make(chan struct{}),
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}
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}
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// enabled returns false on systems not supported.
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func (*watcher) enabled() bool { return true }
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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.runEnded = true
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w.ac.mu.Unlock()
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}()
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logger := log.New("path", w.ac.keydir)
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// Create new watcher.
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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log.Error("Failed to start filesystem watcher", "err", err)
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return
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}
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defer watcher.Close()
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if err := watcher.Add(w.ac.keydir); err != nil {
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if !os.IsNotExist(err) {
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logger.Warn("Failed to watch keystore folder", "err", err)
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}
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return
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}
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logger.Trace("Started watching keystore folder", "folder", w.ac.keydir)
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defer logger.Trace("Stopped watching keystore folder")
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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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debounceDuration = 500 * time.Millisecond
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rescanTriggered = false
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debounce = time.NewTimer(0)
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)
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// Ignore initial trigger
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if !debounce.Stop() {
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<-debounce.C
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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 _, ok := <-watcher.Events:
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if !ok {
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return
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}
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// Trigger the scan (with delay), if not already triggered
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if !rescanTriggered {
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debounce.Reset(debounceDuration)
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rescanTriggered = true
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}
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// The fsnotify library does provide more granular event-info, it
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// would be possible to refresh individual affected files instead
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// of scheduling a full rescan. For most cases though, the
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// full rescan is quick and obviously simplest.
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case err, ok := <-watcher.Errors:
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if !ok {
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return
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}
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log.Info("Filesystem watcher error", "err", err)
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case <-debounce.C:
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w.ac.scanAccounts()
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rescanTriggered = false
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}
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}
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}
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