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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
# ws
ws module is made to provide helpers to create WebSocket client/server.
## Usage
### Server
```ts
import { serve } from "https://deno.land/std/http/server.ts";
import {
acceptWebSocket,
isWebSocketCloseEvent,
isWebSocketPingEvent,
} from "https://deno.land/std/ws/mod.ts";
/** websocket echo server */
const port = Deno.args[0] || "8080";
console.log(`websocket server is running on :${port}`);
for await (const req of serve(`:${port}`)) {
const { conn, r: bufReader, w: bufWriter, headers } = req;
try {
const sock = await acceptWebSocket({
conn,
bufReader,
bufWriter,
headers,
});
console.log("socket connected!");
try {
for await (const ev of sock) {
if (typeof ev === "string") {
// text message
console.log("ws:Text", ev);
await sock.send(ev);
} else if (ev instanceof Uint8Array) {
// binary message
console.log("ws:Binary", ev);
} else if (isWebSocketPingEvent(ev)) {
const [, body] = ev;
// ping
console.log("ws:Ping", body);
} else if (isWebSocketCloseEvent(ev)) {
// close
const { code, reason } = ev;
console.log("ws:Close", code, reason);
}
}
} catch (err) {
console.error(`failed to receive frame: ${err}`);
if (!sock.isClosed) {
await sock.close(1000).catch(console.error);
}
}
} catch (err) {
console.error(`failed to accept websocket: ${err}`);
await req.respond({ status: 400 });
}
}
```
### Client
```ts
import {
connectWebSocket,
isWebSocketCloseEvent,
isWebSocketPingEvent,
isWebSocketPongEvent,
} from "https://deno.land/std/ws/mod.ts";
import { encode } from "https://deno.land/std/encoding/utf8.ts";
import { BufReader } from "https://deno.land/std/io/bufio.ts";
import { TextProtoReader } from "https://deno.land/std/textproto/mod.ts";
import { blue, green, red, yellow } from "https://deno.land/std/fmt/colors.ts";
const endpoint = Deno.args[0] || "ws://127.0.0.1:8080";
/** simple websocket cli */
try {
const sock = await connectWebSocket(endpoint);
console.log(green("ws connected! (type 'close' to quit)"));
const messages = async (): Promise<void> => {
for await (const msg of sock) {
if (typeof msg === "string") {
console.log(yellow(`< ${msg}`));
} else if (isWebSocketPingEvent(msg)) {
console.log(blue("< ping"));
} else if (isWebSocketPongEvent(msg)) {
console.log(blue("< pong"));
} else if (isWebSocketCloseEvent(msg)) {
console.log(red(`closed: code=${msg.code}, reason=${msg.reason}`));
}
}
};
const cli = async (): Promise<void> => {
const tpr = new TextProtoReader(new BufReader(Deno.stdin));
while (true) {
await Deno.stdout.write(encode("> "));
const line = await tpr.readLine();
if (line === null) {
break;
}
if (line === "close") {
break;
} else if (line === "ping") {
await sock.ping();
} else {
await sock.send(line);
}
}
};
await Promise.race([messages(), cli()]).catch(console.error);
if (!sock.isClosed) {
await sock.close(1000).catch(console.error);
}
} catch (err) {
console.error(red(`Could not connect to WebSocket: '${err}'`));
}
Deno.exit(0);
```
## API
### isWebSocketCloseEvent
Returns true if input value is a WebSocketCloseEvent, false otherwise.
### isWebSocketPingEvent
Returns true if input value is a WebSocketPingEvent, false otherwise.
### isWebSocketPongEvent
Returns true if input value is a WebSocketPongEvent, false otherwise.
### unmask
Unmask masked WebSocket payload.
### writeFrame
Write WebSocket frame to inputted writer.
### readFrame
Read WebSocket frame from inputted BufReader.
### createMask
Create mask from the client to the server with random 32bit number.
### acceptable
Returns true if input headers are usable for WebSocket, otherwise false
### createSecAccept
Create value of Sec-WebSocket-Accept header from inputted nonce.
### acceptWebSocket
Upgrade inputted TCP connection into WebSocket connection.
### createSecKey
Returns base64 encoded 16 bytes string for Sec-WebSocket-Key header.
### connectWebSocket
Connect to WebSocket endpoint url with inputted endpoint string and headers.
- note: Endpoint must be acceptable for URL.
|
