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Merge pull request #53 from juanolon/hotreload
Hotreload extension
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package hotreload | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "html/template" | ||
| "log" | ||
| "sync" | ||
|
|
||
| "github.com/emad-elsaid/xlog" | ||
| . "github.com/emad-elsaid/xlog" | ||
| "github.com/gorilla/websocket" | ||
| ) | ||
|
|
||
| var ( | ||
| upgrader = websocket.Upgrader{ReadBufferSize: 1024, WriteBufferSize: 1024} | ||
| clients = make(map[*websocket.Conn]bool) | ||
| clientsMutex sync.Mutex | ||
| ) | ||
|
|
||
| func init() { | ||
| Listen(Changed, NotifyPageChange) | ||
| Get(`/+/hotreload`, handleWebSocket) | ||
| RegisterWidget(AFTER_VIEW_WIDGET, 0, clientWidget) | ||
| } | ||
|
|
||
| func NotifyPageChange(p Page) error { | ||
| if !p.Exists() { | ||
| return nil | ||
| } | ||
|
|
||
| message := map[string]string{"url": fmt.Sprintf("/%s", p.Name())} | ||
|
|
||
| clientsMutex.Lock() | ||
| defer clientsMutex.Unlock() | ||
|
|
||
| for client := range clients { | ||
| err := client.WriteJSON(message) | ||
| if err != nil { | ||
| client.Close() | ||
| delete(clients, client) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func handleWebSocket(w Response, r Request) Output { | ||
| if READONLY { | ||
| return NoContent() | ||
| } | ||
|
|
||
| conn, err := upgrader.Upgrade(w, r, nil) | ||
| if err != nil { | ||
| log.Println("Upgrade error:", err) | ||
| return BadRequest(err.Error()) | ||
| } | ||
|
|
||
| // keep connection open | ||
| go func() { | ||
| defer func() { | ||
| clientsMutex.Lock() | ||
| delete(clients, conn) | ||
| clientsMutex.Unlock() | ||
| conn.Close() | ||
| }() | ||
|
|
||
| for { | ||
| mt, _, err := conn.ReadMessage() | ||
| if err != nil || mt == websocket.CloseMessage { | ||
| break | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| clientsMutex.Lock() | ||
| clients[conn] = true | ||
| clientsMutex.Unlock() | ||
|
|
||
| return xlog.Noop | ||
| } | ||
|
|
||
| // TODO use same HOST and PORT than server | ||
| const clientScript = ` | ||
| <script> | ||
| (() => { | ||
| const socketUrl = 'ws://'+window.location.host+'/+/hotreload'; | ||
| let socket = new WebSocket(socketUrl); | ||
| socket.addEventListener('message', (evt) => { | ||
| let data = JSON.parse(evt.data) | ||
| window.location.href = data.url; | ||
| }); | ||
| })(); | ||
| </script> | ||
| ` | ||
|
|
||
| func clientWidget(p Page) template.HTML { | ||
| if !READONLY { | ||
| return template.HTML(clientScript) | ||
| } | ||
|
|
||
| return "" | ||
| } |
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