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fsnotify_monitor.go
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fsnotify_monitor.go
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package monitor
import (
"os"
"path/filepath"
"github.com/fsnotify/fsnotify"
"github.com/oneut/lrp/config"
"github.com/oneut/lrp/logger"
)
func NewFsnotifyMonitor(name string, monitorConfig config.Monitor) *fsnotifyMonitor {
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
monitor := &fsnotifyMonitor{
name: name,
watcher: watcher,
paths: monitorConfig.Paths,
}
for _, ignore := range monitorConfig.Ignores {
if ignore != "" {
monitor.AddIgnore(ignore)
}
}
return monitor
}
type fsnotifyMonitor struct {
name string
watcher *fsnotify.Watcher
paths []string
ignores []*Ignore
}
func (fm *fsnotifyMonitor) AddIgnore(ignore string) {
fm.ignores = append(fm.ignores, NewIgnore(ignore))
}
func (fm *fsnotifyMonitor) Run(fn func(string)) {
logger.InfoMonitor(fm.name, "start")
defer fm.watcher.Close()
fm.initMonitorPath()
done := make(chan bool)
go func() {
for {
select {
case event := <-fm.watcher.Events:
absPath := fm.getAbsPath(event.Name)
if fm.isIgnoreAbsPath(absPath) {
break
}
switch {
case event.Op&fsnotify.Create == fsnotify.Create:
fm.addWalkMonitorPath(absPath)
fn(absPath)
logger.InfoMonitor(fm.name, event.Op.String() " " absPath)
case event.Op&fsnotify.Write == fsnotify.Write:
fm.addWalkMonitorPath(absPath)
fn(absPath)
logger.InfoMonitor(fm.name, event.Op.String() " " absPath)
case event.Op&fsnotify.Rename == fsnotify.Rename:
fm.addWalkMonitorPath(absPath)
fn(absPath)
logger.InfoMonitor(fm.name, event.Op.String() " " absPath)
case event.Op&fsnotify.Remove == fsnotify.Remove:
// `remove monitor path` is not required
fn(absPath)
logger.InfoMonitor(fm.name, event.Op.String() " " absPath)
}
case err := <-fm.watcher.Errors:
panic(err)
}
}
}()
<-done
}
func (fm *fsnotifyMonitor) isIgnoreAbsPath(absPath string) bool {
if len(fm.ignores) == 0 {
return false
}
for _, ignore := range fm.ignores {
if ignore.Match(absPath) {
return true
}
}
return false
}
func (fm *fsnotifyMonitor) initMonitorPath() {
for _, path := range fm.paths {
absPath := fm.getAbsPath(path)
if absPath == "" {
continue
}
fileInfo, err := os.Stat(absPath)
if err != nil {
panic(err)
}
if fileInfo.IsDir() {
fm.addWalkMonitorPath(absPath)
continue
}
// Support specific file.
fm.addMonitorPath(absPath)
}
}
func (fm *fsnotifyMonitor) addWalkMonitorPath(absPath string) {
err := filepath.Walk(absPath, func(path string, fileInfo os.FileInfo, err error) error {
if err != nil {
// not exists file or directory
return nil
}
if fm.isIgnoreAbsPath(path) {
return nil
}
if fileInfo.IsDir() {
fm.addMonitorPath(path)
}
return nil
})
if err != nil {
panic(err)
}
}
func (fm *fsnotifyMonitor) addMonitorPath(path string) {
err := fm.watcher.Add(path)
if err != nil {
panic(err)
}
logger.InfoMonitor(fm.name, "watch " path)
}
func (fm *fsnotifyMonitor) getAbsPath(path string) string {
if path == "" {
return ""
}
if filepath.IsAbs(path) {
return path
}
absPath, err := filepath.Abs(path)
if err != nil {
panic(err)
}
return absPath
}
func (fm *fsnotifyMonitor) Stop() {
logger.InfoMonitor(fm.name, "stop")
fm.watcher.Close()
}