connection.go (1581B)
1 // Copyright 2015 The Hugo Authors. All rights reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 // http://www.apache.org/licenses/LICENSE-2.0
7 //
8 // Unless required by applicable law or agreed to in writing, software
9 // distributed under the License is distributed on an "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 // See the License for the specific language governing permissions and
12 // limitations under the License.
13
14 package livereload
15
16 import (
17 "bytes"
18 "sync"
19
20 "github.com/gorilla/websocket"
21 )
22
23 type connection struct {
24 // The websocket connection.
25 ws *websocket.Conn
26
27 // Buffered channel of outbound messages.
28 send chan []byte
29
30 // There is a potential data race, especially visible with large files.
31 // This is protected by synchronisation of the send channel's close.
32 closer sync.Once
33 }
34
35 func (c *connection) close() {
36 c.closer.Do(func() {
37 close(c.send)
38 })
39 }
40
41 func (c *connection) reader() {
42 for {
43 _, message, err := c.ws.ReadMessage()
44 if err != nil {
45 break
46 }
47 if bytes.Contains(message, []byte(`"command":"hello"`)) {
48 c.send <- []byte(`{
49 "command": "hello",
50 "protocols": [ "http://livereload.com/protocols/official-7" ],
51 "serverName": "Hugo"
52 }`)
53 }
54 }
55 c.ws.Close()
56 }
57
58 func (c *connection) writer() {
59 for message := range c.send {
60 err := c.ws.WriteMessage(websocket.TextMessage, message)
61 if err != nil {
62 break
63 }
64 }
65 c.ws.Close()
66 }