/
rwc.go
79 lines (68 loc) · 1.38 KB
/
rwc.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
// Package wsrpc provides a ReadWriteCloser which operates on a WebSocket
// connection.
package wsrpc
import (
"github.com/gorilla/websocket"
"io"
)
// ReadWriteCloser is a rwc based on WebSockets
type ReadWriteCloser struct {
ws *websocket.Conn
r io.Reader
w io.WriteCloser
}
// NewReadWriteCloser creates a new rwc from a WebSocket connection
func NewReadWriteCloser(ws *websocket.Conn) ReadWriteCloser {
return ReadWriteCloser{ws: ws}
}
// Read reads from the WebSocket into p
func (rwc *ReadWriteCloser) Read(p []byte) (n int, err error) {
if rwc.r == nil {
_, rwc.r, err = rwc.ws.NextReader()
if err != nil {
return 0, err
}
}
for n = 0; n < len(p); {
var m int
m, err = rwc.r.Read(p[n:])
n += m
if err == io.EOF {
// done
rwc.r = nil
break
}
if err != nil {
break
}
}
return
}
// Write writes the provided bytes to the WebSocket
func (rwc *ReadWriteCloser) Write(p []byte) (n int, err error) {
if rwc.w == nil {
rwc.w, err = rwc.ws.NextWriter(websocket.TextMessage)
if err != nil {
return 0, err
}
}
for n = 0; n < len(p); {
m, err := rwc.w.Write(p)
n += m
if err != nil {
break
}
}
if err != nil || n == len(p) {
err = rwc.Close()
}
return
}
// Close the rwc and the underlying WebSocket connection
func (rwc *ReadWriteCloser) Close() (err error) {
if rwc.w != nil {
err = rwc.w.Close()
rwc.w = nil
}
return
}