/
wshandler.go
124 lines (112 loc) · 2.99 KB
/
wshandler.go
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package livepreview
import (
"io/fs"
"log"
"net/http"
"path/filepath"
"time"
"github.com/fsnotify/fsnotify"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
)
type M map[string]interface{}
func WatchDir(path string, watcher *fsnotify.Watcher) error {
return filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return errors.Wrapf(err, "%s: 访问目录出错", path)
}
err = watcher.Add(path)
if err != nil {
return errors.Wrapf(err, "%s: 目录添加监视失败", filepath.Join(path))
}
return nil
})
}
func MakeWebSocketHandler(watcher *fsnotify.Watcher) http.Handler {
var upgrader = websocket.Upgrader{}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("error during protocol upgrade: %s", err.Error())
return
}
defer conn.Close()
c := make(chan struct{}, 1)
go func() {
defer func() {
c <- struct{}{}
}()
for {
// 心跳频率 1s
err = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
if err != nil {
log.Fatal(err)
}
mt, _, err := conn.ReadMessage()
if err != nil {
if websocket.IsCloseError(err) {
log.Printf("%s: websocket closed", conn.RemoteAddr().String())
}
return
}
if mt == websocket.CloseMessage {
log.Printf("%s: websocket closed", conn.RemoteAddr().String())
return
}
}
}()
for {
select {
case <-c:
log.Printf("%s: connection closed", conn.RemoteAddr().String())
return
case evt := <-watcher.Events:
switch evt.Op {
case fsnotify.Remove:
log.Printf("%s: removed", evt.Name)
err = conn.WriteJSON(M{"reload": true})
if err != nil {
log.Printf("%s: write json fail: %s", conn.RemoteAddr().String(), err.Error())
return
}
case fsnotify.Rename:
log.Printf("%s: renamed", evt.Name)
err = conn.WriteJSON(M{"reload": true})
if err != nil {
log.Printf("%s: write json fail: %s", conn.RemoteAddr().String(), err.Error())
return
}
case fsnotify.Create:
log.Printf("%s: created", evt.Name)
err = conn.WriteJSON(M{"reload": true})
if err != nil {
log.Printf("%s: write json fail: %s", conn.RemoteAddr().String(), err.Error())
return
}
case fsnotify.Write:
log.Printf("%s: write", evt.Name)
err = conn.WriteJSON(M{"reload": true})
if err != nil {
log.Printf("%s: write json fail: %s", conn.RemoteAddr().String(), err.Error())
return
}
case fsnotify.Chmod:
log.Printf("%s: chmod", evt.Name)
err = conn.WriteJSON(M{"reload": true})
if err != nil {
log.Printf("%s: write json fail: %s", conn.RemoteAddr().String(), err.Error())
return
}
default:
log.Printf("%s: unknown op %d", evt.Name, evt.Op)
return
}
case err := <-watcher.Errors:
log.Printf("fsnotify error: %s", err.Error())
return
default:
time.Sleep(time.Second)
}
}
})
}