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|
package watcher
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"path/filepath"
"github.com/mpolden/unp/executil"
"github.com/mpolden/unp/pathutil"
"github.com/rjeczalik/notify"
)
const notifyFlag = notify.Write | notify.Rename
type Handler interface {
Handle(filename, postCommand string, remove bool) error
}
type scriptHandler struct{}
func (h *scriptHandler) Handle(filename, postCommand string, remove bool) error {
data := executil.CommandData{
Dir: filepath.Dir(filename),
Base: filepath.Base(filename),
Name: filename,
}
return executil.Run(postCommand, data)
}
type Watcher struct {
config Config
events chan notify.EventInfo
signal chan os.Signal
done chan bool
mu sync.Mutex
wg sync.WaitGroup
}
func (w *Watcher) handle(name string) error {
p, ok := w.config.findPath(name)
if !ok {
return fmt.Errorf("no configured path found: %s", name)
}
if p.SkipHidden && pathutil.ContainsHidden(name) {
return fmt.Errorf("hidden parent dir or file: %s", name)
}
depth := pathutil.Depth(name)
if !p.validDepth(depth) {
return fmt.Errorf("incorrect depth: %s depth=%d min=%d max=%d",
name, depth, p.MinDepth, p.MaxDepth)
}
if match, err := p.match(filepath.Base(name)); !match {
if err != nil {
return err
}
return fmt.Errorf("no match found: %s", name)
}
return p.handler.Handle(name, p.PostCommand, p.Remove)
}
func (w *Watcher) watch() {
for _, path := range w.config.Paths {
rpath := filepath.Join(path.Name, "...")
if err := notify.Watch(rpath, w.events, notifyFlag); err != nil {
log.Printf("failed to watch %s: %s", rpath, err)
} else {
log.Printf("watching %s recursively", path.Name)
}
}
}
func (w *Watcher) reload() {
cfg, err := ReadConfig(w.config.filename)
if err == nil {
notify.Stop(w.events)
w.config = cfg
w.watch()
} else {
log.Printf("failed to read config: %s", err)
}
}
func (w *Watcher) rescan() {
for _, p := range w.config.Paths {
err := filepath.Walk(p.Name, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info == nil || !info.Mode().IsRegular() {
return nil
}
if err := w.handle(path); err != nil {
log.Print(err)
}
return nil
})
if err != nil {
log.Printf("failed to rescan %s: %s", p.Name, err)
}
}
}
func (w *Watcher) readSignal() {
for {
select {
case <-w.done:
return
case s := <-w.signal:
w.mu.Lock()
switch s {
case syscall.SIGUSR1:
log.Printf("received %s: rescanning watched directories", s)
w.rescan()
case syscall.SIGUSR2:
log.Printf("received %s: reloading configuration", s)
w.reload()
case syscall.SIGTERM, syscall.SIGINT:
log.Printf("received %s: shutting down", s)
w.Stop()
}
w.mu.Unlock()
}
}
}
func (w *Watcher) readEvent() {
for {
select {
case <-w.done:
return
case ev := <-w.events:
w.mu.Lock()
if err := w.handle(ev.Path()); err != nil {
log.Print(err)
}
w.mu.Unlock()
}
}
}
func (w *Watcher) goServe() {
w.wg.Add(2)
go func() {
defer w.wg.Done()
w.readSignal()
}()
go func() {
defer w.wg.Done()
w.readEvent()
}()
}
func (w *Watcher) Start() {
w.goServe()
w.watch()
w.wg.Wait()
}
func (w *Watcher) Stop() {
notify.Stop(w.events)
w.done <- true
w.done <- true
}
func New(cfg Config) *Watcher {
// Buffer events so that we don't miss any
events := make(chan notify.EventInfo, cfg.BufferSize)
sig := make(chan os.Signal, 1)
done := make(chan bool, 1)
signal.Notify(sig)
return &Watcher{
config: cfg,
events: events,
signal: sig,
done: done,
}
}
|
