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
|
/* socket.js, a simple wrapper for a YWOT websocket connection */
class retryws extends EventEmitter{ // a wrapper on ws that retries on failure
constructor(addr) {
let sock;
this.sockdown = true;
this.send = (message) => {
if (sockdown){
throw "Socket is down!";
}
sock.send(message);
}
function sockinit(){ // addr is not expected to change, so not handed as input; similarly, sock is not passed in a chain because behavior is expected to be serial (either initializing or retrying)
sock = new ws(addr);
sock.on('open', () => { this.emit('open'); sockdown = false; });
sock.on('close', (err) => { setTimeout(sockinit,1000); sockdown = true; this.emit('close'); });
sock.on('error', (err) => { sock.close(); });
sock.on('message', (message) => { this.emit('message',message); });
}
}
}
class Socket extends retryws {
constructor(world='') { // Takes the name of the world, which can be an empty string.
let loc = (name = '') ? '' : `/${name}`;
let addr = `wss://www.yourworldoftext.com/${loc}ws`;
super(addr);
this.on('message', (msg)=>{
msg = JSON.parse(msg);
switch (message.kind){
case 'write':
this.emit('write', message.accepted, message.rejected); break; // A confirmation message for writes (accepted/rejected updates)
case 'cursor':
this.emit('cursor', message.positions, message.sender); break; // Must be used for self-identification
case 'tileUpdate':
this.emit('tileUpdate', message.sender, message.source, message.tiles); break; // Any change by another user or possibly oneself
case 'fetch':
this.emit('fetch', message.tiles); break; // The response to a fetch request
}
}
this.fetch = function(coords){ //coords is a list of quadruplets, each a min/max pair of y/x coordinate pairs which describes at most 1000 tiles
//Unchecked for speed
for (var i=0; i<coords.length; i++){
coords[i] = {"minY":coords[i][0], "minX":coords[i][1], "maxY":coords[i][2], "maxX":coords[i][3]};
}
this.send(`{"fetchRectangles":${JSON.stringify(coords)},"kind":"fetch","v":"3"}`);
}
this.write = function(chars){ //chars is an list of triplets [ tile coordinate (y/x), pixel coordinate (y/x < 16), char ]
if (chars.length > 200){
throw "Too many characters to write";
}
for (var i=0; i<chars.length; i++){
chars[i].splice(4,0,0); //
chars[i].push(i);
}
this.send(`{"edits":${JSON.stringify(chars)},"kind":"write"}`;
}
this.cursor = function(coords){ //coords is just one quadruplet analagous to fetch; I think the api could handle more, but it's unnecessary for now.
this.send(`"kind":"cursor","positions":[${JSON.stringify(coords)}]}`;
}
}
}
|
