/
boop.js
43 lines (34 loc) · 894 Bytes
/
boop.js
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const dgram = require('dgram');
const server = dgram.createSocket('udp4');
var registry = {};
function joined(msg, rinfo) {
console.log(`${msg} discovered from ${rinfo.address}:${rinfo.port}`);
}
function parted(msg) {
console.log(`${msg} has left the building`);
}
function cleanUp() {
for (var key in registry) {
if (registry[key] && Date.now() - registry[key] > 1500) {
parted(key);
registry[key] = null;
}
}
}
setInterval(cleanUp, 1500);
server.on('error', (err) => {
console.log(`server error:\n${err.stack}`);
server.close();
});
server.on('message', (msg, rinfo) => {
if (!registry[msg]) {
joined(msg, rinfo)
}
registry[msg] = Date.now();
});
server.on('listening', () => {
var address = server.address();
console.log(`server listening ${address.address}:${address.port}`);
});
server.bind(12345);
// server listening 0.0.0.0:12345