103 lines
2.4 KiB
TypeScript
103 lines
2.4 KiB
TypeScript
import WebSocket from 'ws';
|
|
import Coordinates from './coordinates';
|
|
|
|
const wss = new WebSocket.Server({ port: 8081 });
|
|
const receivers: WebSocket[] = [];
|
|
let sender: WebSocket | null = null;
|
|
|
|
const paths = [] as Coordinates[][];
|
|
|
|
let currentPath = [] as Coordinates[];
|
|
|
|
wss.on('connection', ws => {
|
|
console.log('CONNECTION incoming');
|
|
ws.once('message', message => {
|
|
const str = message.toString();
|
|
switch (str) {
|
|
case 'SENDER':
|
|
setSender(ws);
|
|
break;
|
|
case 'RECEIVER':
|
|
addReceiver(ws)
|
|
break;
|
|
default:
|
|
console.log('Unknown register code: ' + str);
|
|
break;
|
|
}
|
|
});
|
|
});
|
|
|
|
console.log('READY');
|
|
|
|
function addReceiver(ws: WebSocket) {
|
|
console.log('RECEIVER registered');
|
|
for (const path of paths) {
|
|
ws.send('START');
|
|
path.forEach(c => ws.send(JSON.stringify(c)));
|
|
ws.send('STOP');
|
|
}
|
|
|
|
receivers.push(ws);
|
|
|
|
ws.onclose = () => {
|
|
// Remove receiver when connection closes
|
|
for (const [i, recv] of receivers.entries()) {
|
|
if (ws === recv) {
|
|
receivers.splice(i, 1);
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
function setSender(ws: WebSocket) {
|
|
console.log('SENDER is being registered')
|
|
if (sender) {
|
|
console.log('Removing current sender...')
|
|
sender.close();
|
|
clearPaths();
|
|
}
|
|
|
|
sender = ws;
|
|
ws.on('message', msg => processMessage(msg));
|
|
}
|
|
|
|
function processMessage(message: WebSocket.Data) {
|
|
const text = message.toString();
|
|
switch (text) {
|
|
case 'START':
|
|
startPath();
|
|
break;
|
|
case 'STOP':
|
|
finishPath();
|
|
break;
|
|
default:
|
|
processCoordinates(text);
|
|
break;
|
|
}
|
|
}
|
|
|
|
function processCoordinates(text: string) {
|
|
console.log('COORDINATES received: ' + text);
|
|
|
|
console.log('SENDING to ' + receivers.length, 'clients');
|
|
receivers.forEach(r => r.send(text));
|
|
|
|
currentPath.push(JSON.parse(text));
|
|
}
|
|
|
|
function startPath() {
|
|
currentPath = [];
|
|
receivers.forEach(r => r.send('START'));
|
|
}
|
|
|
|
function finishPath() {
|
|
paths.push(currentPath);
|
|
receivers.forEach(r => r.send("STOP"));
|
|
}
|
|
|
|
function clearPaths() {
|
|
paths.splice(0, paths.length);
|
|
receivers.forEach(r => r.send('CLEAR'));
|
|
console.log('Paths have been cleared');
|
|
}
|