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'use strict';
const common = require('../common');
const NUM_WORKERS = 4;
const PACKETS_PER_WORKER = 10;
const assert = require('assert');
const cluster = require('cluster');
const dgram = require('dgram');
if (common.isWindows) {
common.skip('dgram clustering is currently not supported ' +
'on windows.');
return;
}
if (cluster.isMaster)
master();
else
worker();
function master() {
var listening = 0;
// Fork 4 workers.
for (var i = 0; i < NUM_WORKERS; i++)
cluster.fork();
// Wait until all workers are listening.
cluster.on('listening', common.mustCall(() => {
if (++listening < NUM_WORKERS)
return;
// Start sending messages.
const buf = Buffer.from('hello world');
const socket = dgram.createSocket('udp4');
var sent = 0;
doSend();
function doSend() {
socket.send(buf, 0, buf.length, common.PORT, '127.0.0.1', afterSend);
}
function afterSend() {
sent++;
if (sent < NUM_WORKERS * PACKETS_PER_WORKER) {
doSend();
} else {
socket.close();
}
}
}, NUM_WORKERS));
// Set up event handlers for every worker. Each worker sends a message when
// it has received the expected number of packets. After that it disconnects.
for (const key in cluster.workers) {
if (cluster.workers.hasOwnProperty(key))
setupWorker(cluster.workers[key]);
}
function setupWorker(worker) {
var received = 0;
worker.on('message', common.mustCall((msg) => {
received = msg.received;
worker.disconnect();
}));
worker.on('exit', common.mustCall(() => {
assert.strictEqual(received, PACKETS_PER_WORKER);
}));
}
}
function worker() {
var received = 0;
// Create udp socket and start listening.
var socket = dgram.createSocket('udp4');
socket.on('message', common.mustCall((data, info) => {
received++;
// Every 10 messages, notify the master.
if (received === PACKETS_PER_WORKER) {
process.send({received: received});
socket.close();
}
}, PACKETS_PER_WORKER));
socket.bind(common.PORT);
}
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