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watcher.go
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watcher.go
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package main
import (
"errors"
"sync"
"sync/atomic"
"time"
"github.com/fsnotify/fsnotify"
)
type watcher struct {
fsnWatcher *fsnotify.Watcher
errs chan error
events chan *event
rwmutex sync.RWMutex
stopWatching chan chan struct{}
trace map[string]*event
processingMustStop uint32
}
func newWatcher(path string, events chan *event, errs chan error) (*watcher, error) {
if len(path) == 0 {
return nil, errors.New("watcher: invalid path, received empty string")
}
if events == nil {
return nil, errors.New("watcher: invalid events channel, received nil")
}
if errs == nil {
return nil, errors.New("watcher: invalid errors channel, received nil")
}
fsnWatcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
if err := fsnWatcher.Add(path); err != nil {
return nil, err
}
var w = &watcher{
fsnWatcher: fsnWatcher,
errs: errs,
events: events,
rwmutex: sync.RWMutex{},
stopWatching: make(chan chan struct{}),
trace: make(map[string]*event),
processingMustStop: 0,
}
return w, nil
}
func (w *watcher) processEvent(fsevent fsnotify.Event) {
var (
exist bool
targetEvent *event
timestamp string = time.Now().UTC().String()
)
w.rwmutex.RLock()
targetEvent, exist = w.trace[fsevent.Name]
w.rwmutex.RUnlock()
if !exist {
var newEvent = &event{
mutex: sync.Mutex{},
trace: make(map[fsnotify.Op]string),
name: fsevent.Name,
}
targetEvent = newEvent
w.rwmutex.Lock()
w.trace[fsevent.Name] = targetEvent
w.rwmutex.Unlock()
}
switch fsevent.Op {
case fsnotify.Create:
targetEvent.create(timestamp)
case fsnotify.Write:
targetEvent.write(timestamp)
case fsnotify.Remove:
targetEvent.remove(timestamp)
case fsnotify.Rename:
targetEvent.rename(timestamp)
case fsnotify.Chmod:
targetEvent.chmod(timestamp)
}
if targetEvent.isReadyForBeingProcessed() && atomic.LoadUint32(&w.processingMustStop) == 0 {
w.rwmutex.Lock()
w.events <- targetEvent
delete(w.trace, targetEvent.name)
w.rwmutex.Unlock()
}
}
func (w *watcher) stop() error {
atomic.StoreUint32(&w.processingMustStop, 1)
ch := make(chan struct{})
w.stopWatching <- ch
<-ch
defer close(ch)
defer close(w.stopWatching)
return w.fsnWatcher.Close()
}
func (w *watcher) watch() {
for {
select {
case ch := <-w.stopWatching:
ch <- struct{}{}
return
case e, ok := <-w.fsnWatcher.Events:
if ok {
go w.processEvent(e)
}
case err, ok := <-w.fsnWatcher.Errors:
if ok && err != nil {
w.errs <- err
}
}
}
}