/
liveReload.go
201 lines (187 loc) · 4.14 KB
/
liveReload.go
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package main
import (
"fmt"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"golang.org/x/exp/inotify"
"golang.org/x/net/websocket"
)
// <script src="http://localhost:35729/livereload.js"></script>
type llcmd struct {
Command string `json:"command"`
Protocols []string `json:"protocols,omitempty"`
Url string `json:"url,omitempty"`
Path string `json:"path,omitempty"`
LiveCSS bool `json:"liveCSS"`
Message string `json:"message,omitempty"`
ServerName string `json:"serverName,omitempty"`
}
const hostPort = ":35729"
type fncCmd int
const (
fncCmdQuit fncCmd = iota
fncCmdFileChanged
fncCmdAddWS
fncCmdRemWS
fncCmdAdmin
)
type fncMsg struct {
cmd fncCmd
path string
forWS *websocket.Conn
}
func liveloadHandler(ws *websocket.Conn, fncChan chan fncMsg) {
log.Println("serveing")
var msg llcmd
err := websocket.JSON.Receive(ws, &msg)
if err != nil {
log.Println(err)
return
}
err = websocket.JSON.Send(ws,
&llcmd{
Command: "hello",
Protocols: []string{"http://livereload.com/protocols/official-7"},
ServerName: "goLivereload",
})
if err != nil {
log.Println(err)
return
}
for {
err := websocket.JSON.Receive(ws, &msg)
if err != nil {
log.Println(err)
fncChan <- fncMsg{cmd: fncCmdQuit}
return
}
log.Println(msg)
}
}
func skipPath(path string, info os.FileInfo) bool {
if info.IsDir() {
return true
}
if strings.HasPrefix(info.Name(), ".") {
return true
}
if strings.HasPrefix(info.Name(), "#") {
return true
}
if strings.HasSuffix(info.Name(), "~") {
return true
}
return false
}
func watchFilesDarwin(top string, c chan fncMsg) {
modTimes := make(map[string]time.Time)
filepath.Walk(top, func(path string, info os.FileInfo, err error) error {
if skipPath(path, info) {
return nil
}
modTimes[path] = info.ModTime()
return nil
})
for {
filepath.Walk(top, func(path string, info os.FileInfo, err error) error {
if skipPath(path, info) {
return nil
}
if ts, exists := modTimes[path]; exists {
if info.ModTime().After(ts) {
fmt.Println("changed", path, info)
modTimes[path] = info.ModTime()
c <- fncMsg{cmd: fncCmdFileChanged, path: path}
return nil
}
} else {
// new file
fmt.Println("new file", path, info)
modTimes[path] = info.ModTime()
c <- fncMsg{cmd: fncCmdFileChanged, path: path}
return nil
}
return nil
})
time.Sleep(time.Second)
}
}
func watchFilesUnix(top string, c chan fncMsg) {
watcher, err := inotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
err = watcher.Watch(top)
if err != nil {
log.Fatal(err)
}
log.Println("watching", top)
for {
log.Println("event")
select {
case ev := <-watcher.Event:
if ev.Mask&inotify.IN_MODIFY == inotify.IN_MODIFY {
c <- fncMsg{cmd: fncCmdFileChanged, path: ev.Name[11:]}
}
case err := <-watcher.Error:
log.Println("error:", err)
}
}
}
func doUpdates(c chan fncMsg) {
allWS := make(map[*websocket.Conn]error)
for fn := range c {
fmt.Println("fncChan", fn)
switch fn.cmd {
case fncCmdAddWS:
allWS[fn.forWS] = nil
case fncCmdRemWS:
delete(allWS, fn.forWS)
case fncCmdFileChanged:
fmt.Println("reload", fn.path)
for ws, wsErr := range allWS {
if wsErr != nil {
continue
}
err := websocket.JSON.Send(ws,
&llcmd{
Command: "reload",
Path: fn.path,
LiveCSS: true,
})
if err != nil {
allWS[ws] = err
log.Println(err)
}
}
case fncCmdAdmin:
newAllWS := make(map[*websocket.Conn]error)
for ws, err := range allWS {
if err == nil {
newAllWS[ws] = nil
}
}
allWS = newAllWS
}
}
}
func main() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
fncChan := make(chan fncMsg)
go doUpdates(fncChan)
go watchFilesDarwin("dippapp/doc", fncChan)
http.Handle("/", http.FileServer(http.Dir("doc")))
http.Handle("/livereload", websocket.Handler(func(ws *websocket.Conn) {
fncChan <- fncMsg{cmd: fncCmdAddWS, forWS: ws}
liveloadHandler(ws, fncChan)
fncChan <- fncMsg{cmd: fncCmdRemWS, forWS: ws}
}))
err := http.ListenAndServe(hostPort, nil)
if err != nil {
panic("ListenAndServe: " + err.Error())
}
}