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|
package main
import (
"log"
"os"
"path/filepath"
"time"
"github.com/fsnotify/fsnotify"
)
type watch struct {
watcher *fsnotify.Watcher
events <-chan fsnotify.Event
quit chan struct{}
loads map[string]bool
loadTimer *time.Timer
updates map[string]bool
updateTimer *time.Timer
dirChan chan<- *dir
fileChan chan<- *file
delChan chan<- string
}
func newWatch(dirChan chan<- *dir, fileChan chan<- *file, delChan chan<- string) *watch {
return &watch{
quit: make(chan struct{}),
loads: make(map[string]bool),
loadTimer: time.NewTimer(0),
updates: make(map[string]bool),
updateTimer: time.NewTimer(0),
dirChan: dirChan,
fileChan: fileChan,
delChan: delChan,
}
}
func (watch *watch) start() {
if watch.watcher != nil {
return
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Printf("start watcher: %s", err)
return
}
watch.watcher = watcher
watch.events = watcher.Events
go watch.loop()
}
func (watch *watch) stop() {
if watch.watcher == nil {
return
}
watch.quit <- struct{}{}
watch.watcher.Close()
watch.watcher = nil
watch.events = nil
}
func (watch *watch) add(path string) {
if watch.watcher == nil {
return
}
// ignore /dev since write updates to /dev/tty causes high cpu usage
if path != "/dev" {
watch.watcher.Add(path)
}
}
func (watch *watch) loop() {
for {
select {
case ev := <-watch.events:
if ev.Has(fsnotify.Create) {
for _, path := range watch.getSameDirs(filepath.Dir(ev.Name)) {
watch.addLoad(path)
watch.addUpdate(path)
}
}
if ev.Has(fsnotify.Remove) || ev.Has(fsnotify.Rename) {
dir, file := filepath.Split(ev.Name)
for _, path := range watch.getSameDirs(dir) {
watch.delChan <- filepath.Join(path, file)
watch.addLoad(path)
watch.addUpdate(path)
}
}
if ev.Has(fsnotify.Write) || ev.Has(fsnotify.Chmod) {
dir, file := filepath.Split(ev.Name)
for _, path := range watch.getSameDirs(dir) {
watch.addUpdate(filepath.Join(path, file))
}
}
case <-watch.loadTimer.C:
for path := range watch.loads {
if _, err := os.Lstat(path); err != nil {
continue
}
dir := newDir(path)
dir.sort()
watch.dirChan <- dir
}
watch.loads = make(map[string]bool)
case <-watch.updateTimer.C:
for path := range watch.updates {
if _, err := os.Lstat(path); err != nil {
continue
}
watch.fileChan <- newFile(path)
}
watch.updates = make(map[string]bool)
case <-watch.quit:
return
}
}
}
func (watch *watch) addLoad(path string) {
if len(watch.loads) == 0 {
watch.loadTimer.Stop()
watch.loadTimer.Reset(10 * time.Millisecond)
}
watch.loads[path] = true
}
func (watch *watch) addUpdate(path string) {
if len(watch.updates) == 0 {
watch.updateTimer.Stop()
watch.updateTimer.Reset(10 * time.Millisecond)
}
watch.updates[path] = true
}
// Hacky workaround since fsnotify reports changes for only one path if a
// directory is located at more than one path (e.g. bind mounts).
func (watch *watch) getSameDirs(dir string) []string {
var paths []string
dirStat, err := os.Stat(dir)
if err != nil {
return nil
}
for _, path := range watch.watcher.WatchList() {
if path == dir {
paths = append(paths, path)
continue
}
stat, err := os.Stat(path)
if err != nil {
continue
}
if os.SameFile(stat, dirStat) {
paths = append(paths, path)
}
}
return paths
}
|
