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fs-monitor.go
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fs-monitor.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"runtime"
"sync"
"github.com/fsnotify/fsnotify"
)
var (
PATH string
)
func init() {
flag.StringVar(&PATH, "path", "", "monitor target path")
flag.Parse()
}
func watcher(watchwg *sync.WaitGroup, watchdir chan string) {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
go func() {
for {
select {
case event := <-watcher.Events:
log.Println("event:", event)
if event.Op&fsnotify.Write == fsnotify.Write {
log.Println("modified file:", event.Name)
}
case err := <-watcher.Errors:
log.Println("error:", err)
}
}
}()
for {
select {
case req := <-watchdir:
err := watcher.Add(req)
if err != nil {
log.Fatal(err)
}
fmt.Println(req)
}
}
watchwg.Done()
}
func finddir(wg *sync.WaitGroup, reqdir, resdir chan string) {
for {
select {
case dir := <-reqdir:
go func() {
nodes, err := ioutil.ReadDir(dir)
if err != nil {
log.Fatal(err)
}
for _, node := range nodes {
nodename := node.Name()
nodepath := dir + "/" + nodename
if node.IsDir() {
resdir <- nodepath
}
}
wg.Done()
}()
}
}
}
// https://kldp.org/node/92783
// https://github.com/fsnotify/fsnotify/wiki/FAQ
func main() {
if PATH == "" {
fmt.Println("usage: fs-monitor -path=/Users/breezymind/Cert")
os.Exit(0)
}
var (
maxcpu = runtime.NumCPU()
dirwg = sync.WaitGroup{}
watchwg = sync.WaitGroup{}
reqdir = make(chan string)
resdir = make(chan string)
watchdir = make(chan string)
)
runtime.GOMAXPROCS(maxcpu)
for i := 0; i < maxcpu; i++ {
fmt.Println(fmt.Sprintf("init finder #%d", i))
go finddir(&dirwg, reqdir, resdir)
}
go func() {
for {
select {
case res := <-resdir:
watchdir <- res
dirwg.Add(1)
reqdir <- res
}
}
}()
go func() {
dirwg.Add(1)
reqdir <- PATH
watchdir <- PATH
dirwg.Wait()
}()
watchwg.Add(1)
for i := 0; i < maxcpu; i++ {
fmt.Println(fmt.Sprintf("init watcher #%d", i))
go watcher(&watchwg, watchdir)
}
watchwg.Wait()
}