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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=utf-8 />
<title>Minimal Websocket test app</title>
</head>
<body>
<h2>libwebsockets "dumb-increment-protocol" test applet</h2>
The incrementing number is coming from the server and is individual for
each connection to the server... try opening a second browser window.
Click the button to send the server a websocket message to
reset the number.<br><br>
<table>
<tr>
<td align=center>
<input type=button id=offset value="Reset counter" onclick="reset();">
<input type=button id=offset value="Disconnect" onclick="closeIncrementConnection();">
</td>
<td width=100 align=center><div id=number> </div></td>
<td id=wsdi_statustd align=center><div id=wsdi_status>Not initialized</div></td>
</tr>
</table>
<h2>libwebsockets "lws-mirror-protocol" test applet</h2>
Use the mouse to draw on the canvas below -- all other browser windows open
on this page see your drawing in realtime and you can see any of theirs as
well.
<p>
The lws-mirror protocol doesn't interpret what is being sent to it, it just
re-sends it to every other websocket it has a connection with using that
protocol, including the guy who sent the packet.
<p>libwebsockets-test-client spams circles on to this shared canvas when
run.</p>
<br><br>
<table>
<tr>
<td>Drawing color:
<select id="color" onchange="update_color();">
<option value=#000000>Black</option>
<option value=#0000ff>Blue</option>
<option value=#20ff20>Green</option>
<option value=#802020>Dark Red</option>
</select>
</td>
<td id=wslm_statustd align=center><div id=wslm_status>Not initialized</div></td>
</tr>
<tr>
<button id="clearCanvasButton" onclick="clearCanvas()">Clear Canvas</button>
</tr>
<tr>
<td colspan=2 width=500 align=center style="background-color: #e0e0e0;"><div id="wslm_drawing"> </div></td>
</tr>
</table>
<script>
var pos = 0;
function get_appropriate_ws_url()
{
var pcol;
var u = document.URL;
/*
* We open the websocket encrypted if this page came on an
* https:// url itself, otherwise unencrypted
*/
if (u.substring(0, 5) == "https") {
pcol = "wss://";
u = u.substr(8);
} else {
pcol = "ws://";
if (u.substring(0, 4) == "http")
u = u.substr(7);
}
u = u.split('/');
return pcol + u[0];
}
document.getElementById("number").textContent = get_appropriate_ws_url();
/* dumb increment protocol */
var ws_ctor = window['MozWebSocket'] ? window['MozWebSocket'] : window['WebSocket'];
var socket_di = new ws_ctor(get_appropriate_ws_url(),
"dumb-increment-protocol");
try {
socket_di.onopen = function() {
document.getElementById("wsdi_statustd").style.backgroundColor = "#40ff40";
document.getElementById("wsdi_status").textContent = " websocket connection opened ";
}
socket_di.onmessage =function got_packet(msg) {
document.getElementById("number").textContent = msg.data + "\n";
}
socket_di.onclose = function(){
document.getElementById("wsdi_statustd").style.backgroundColor = "#ff4040";
document.getElementById("wsdi_status").textContent = " websocket connection CLOSED ";
}
} catch(exception) {
alert('<p>Error' + exception);
}
function reset() {
socket_di.send("reset\n");
}
function closeIncrementConnection() {
socket_di.close();
}
/* lws-mirror protocol */
var down = 0;
var no_last = 1;
var last_x = 0, last_y = 0;
var ctx;
var ws_ctor = window['MozWebSocket'] ? window['MozWebSocket'] : window['WebSocket'];
var socket_lm = new ws_ctor(get_appropriate_ws_url(),
"lws-mirror-protocol");
var color = "#000000";
var lws_error = false;
try {
socket_lm.onopen = function() {
document.getElementById("wslm_statustd").style.backgroundColor = "#40ff40";
document.getElementById("wslm_status").textContent = " websocket connection opened ";
}
socket_lm.onerror = function(error) {
lws_error = true;
document.getElementById("wslm_statustd").style.backgroundColor = "#ff4040";
document.getElementById("wslm_status").textContent = " websocket connection ERROR ";
};
socket_lm.onmessage =function got_packet(msg) {
j = msg.data.split(';');
f = 0;
while (f < j.length - 1) {
i = j[f].split(' ');
if (i[0] == 'd') {
ctx.strokeStyle = i[1];
ctx.beginPath();
ctx.moveTo(+(i[2]), +(i[3]));
ctx.lineTo(+(i[4]), +(i[5]));
ctx.stroke();
}
if (i[0] == 'clear') {
ctx.clearRect(0,0,480,300);
}
if (i[0] == 'c') {
ctx.strokeStyle = i[1];
ctx.beginPath();
ctx.arc(+(i[2]), +(i[3]), +(i[4]), 0, Math.PI*2, true);
ctx.stroke();
}
f++;
}
}
socket_lm.onclose = function(){
if (!lws_error) {
document.getElementById("wslm_statustd").style.backgroundColor = "#ff4040";
document.getElementById("wslm_status").textContent = " websocket connection CLOSED ";
}
}
} catch(exception) {
alert('<p>Error' + exception);
}
var canvas = document.createElement('canvas');
canvas.height = 300;
canvas.width = 480;
ctx = canvas.getContext("2d");
document.getElementById('wslm_drawing').appendChild(canvas);
canvas.addEventListener('mousemove', ev_mousemove, false);
canvas.addEventListener('mousedown', ev_mousedown, false);
canvas.addEventListener('mouseup', ev_mouseup, false);
offsetX = offsetY = 0;
element = canvas;
if (element.offsetParent) {
do {
offsetX += element.offsetLeft;
offsetY += element.offsetTop;
} while ((element = element.offsetParent));
}
function update_color() {
color = document.getElementById("color").value;
}
function ev_mousedown (ev) {
down = 1;
}
function ev_mouseup(ev) {
down = 0;
no_last = 1;
}
function ev_mousemove (ev) {
var x, y;
if (ev.offsetX) {
x = ev.offsetX;
y = ev.offsetY;
} else {
x = ev.layerX - offsetX;
y = ev.layerY - offsetY;
}
if (!down)
return;
if (no_last) {
no_last = 0;
last_x = x;
last_y = y;
return;
}
if (socket_lm.readyState === ws_ctor.OPEN)
socket_lm.send("d " + color + " " + last_x + " " + last_y + " " + x + ' ' + y + ';');
last_x = x;
last_y = y;
}
function clearCanvas() {
if (socket_lm.readyState === ws_ctor.OPEN)
socket_lm.send("clear;");
}
</script>
</body>
</html>
|
