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// Flags: --expose-internals
'use strict';
const common = require('../common');
if (common.isWindows)
common.skip('dgram clustering is currently not supported on Windows.');
const NUM_WORKERS = 4;
const PACKETS_PER_WORKER = 10;
const assert = require('assert');
const cluster = require('cluster');
const dgram = require('dgram');
if (cluster.isMaster)
master();
else
worker();
function master() {
const { internalBinding } = require('internal/test/binding');
const { UDP } = internalBinding('udp_wrap');
// Create a handle and use its fd.
const rawHandle = new UDP();
const err = rawHandle.bind(common.localhostIPv4, 0, 0);
assert(err >= 0, String(err));
assert.notStrictEqual(rawHandle.fd, -1);
const fd = rawHandle.fd;
let listening = 0;
// Fork 4 workers.
for (let i = 0; i < NUM_WORKERS; i++)
cluster.fork();
// Wait until all workers are listening.
cluster.on('listening', common.mustCall((worker, address) => {
if (++listening < NUM_WORKERS)
return;
// Start sending messages.
const buf = Buffer.from('hello world');
const socket = dgram.createSocket('udp4');
let sent = 0;
doSend();
function doSend() {
socket.send(buf, 0, buf.length, address.port, address.address, 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) {
let received = 0;
worker.send({
fd,
});
worker.on('message', common.mustCall((msg) => {
received = msg.received;
worker.disconnect();
}));
worker.on('exit', common.mustCall(() => {
assert.strictEqual(received, PACKETS_PER_WORKER);
}));
}
}
function worker() {
let received = 0;
process.on('message', common.mustCall((data) => {
const { fd } = data;
// Create udp socket and start listening.
const 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 });
socket.close();
}
}, PACKETS_PER_WORKER));
socket.bind({
fd,
});
}));
}
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