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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The websocket package implements a client and server for the Web Socket protocol.
// The protocol is defined at http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol
package websocket
// TODO(ukai):
// better logging.
import (
"bufio"
"io"
"net"
"os"
)
// WebSocketAddr is an implementation of net.Addr for Web Sockets.
type WebSocketAddr string
// Network returns the network type for a Web Socket, "websocket".
func (addr WebSocketAddr) Network() string { return "websocket" }
// String returns the network address for a Web Socket.
func (addr WebSocketAddr) String() string { return string(addr) }
// Conn is a channel to communicate to a Web Socket.
// It implements the net.Conn interface.
type Conn struct {
// The origin URI for the Web Socket.
Origin string
// The location URI for the Web Socket.
Location string
// The subprotocol for the Web Socket.
Protocol string
buf *bufio.ReadWriter
rwc io.ReadWriteCloser
}
// newConn creates a new Web Socket.
func newConn(origin, location, protocol string, buf *bufio.ReadWriter, rwc io.ReadWriteCloser) *Conn {
if buf == nil {
br := bufio.NewReader(rwc)
bw := bufio.NewWriter(rwc)
buf = bufio.NewReadWriter(br, bw)
}
ws := &Conn{origin, location, protocol, buf, rwc}
return ws
}
// Read implements the io.Reader interface for a Conn.
func (ws *Conn) Read(msg []byte) (n int, err os.Error) {
for {
frameByte, err := ws.buf.ReadByte()
if err != nil {
return n, err
}
if (frameByte & 0x80) == 0x80 {
length := 0
for {
c, err := ws.buf.ReadByte()
if err != nil {
return n, err
}
length = length*128 + int(c&0x7f)
if (c & 0x80) == 0 {
break
}
}
for length > 0 {
_, err := ws.buf.ReadByte()
if err != nil {
return n, err
}
length--
}
} else {
for {
c, err := ws.buf.ReadByte()
if err != nil {
return n, err
}
if c == '\xff' {
return n, err
}
if frameByte == 0 {
if n+1 <= cap(msg) {
msg = msg[0 : n+1]
}
msg[n] = c
n++
}
if n >= cap(msg) {
return n, os.E2BIG
}
}
}
}
panic("unreachable")
}
// Write implements the io.Writer interface for a Conn.
func (ws *Conn) Write(msg []byte) (n int, err os.Error) {
ws.buf.WriteByte(0)
ws.buf.Write(msg)
ws.buf.WriteByte(0xff)
err = ws.buf.Flush()
return len(msg), err
}
// Close implements the io.Closer interface for a Conn.
func (ws *Conn) Close() os.Error { return ws.rwc.Close() }
// LocalAddr returns the WebSocket Origin for the connection.
func (ws *Conn) LocalAddr() net.Addr { return WebSocketAddr(ws.Origin) }
// RemoteAddr returns the WebSocket locations for the connection.
func (ws *Conn) RemoteAddr() net.Addr { return WebSocketAddr(ws.Location) }
// SetTimeout sets the connection's network timeout in nanoseconds.
func (ws *Conn) SetTimeout(nsec int64) os.Error {
if conn, ok := ws.rwc.(net.Conn); ok {
return conn.SetTimeout(nsec)
}
return os.EINVAL
}
// SetReadTimeout sets the connection's network read timeout in nanoseconds.
func (ws *Conn) SetReadTimeout(nsec int64) os.Error {
if conn, ok := ws.rwc.(net.Conn); ok {
return conn.SetReadTimeout(nsec)
}
return os.EINVAL
}
// SeWritetTimeout sets the connection's network write timeout in nanoseconds.
func (ws *Conn) SetWriteTimeout(nsec int64) os.Error {
if conn, ok := ws.rwc.(net.Conn); ok {
return conn.SetWriteTimeout(nsec)
}
return os.EINVAL
}
var _ net.Conn = (*Conn)(nil) // compile-time check that *Conn implements net.Conn.
|
