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'use strict';
const common = require('../common');
const assert = require('assert');
const dgram = require('dgram');
const fork = require('child_process').fork;
const LOCAL_BROADCAST_HOST = '224.0.0.114';
const TIMEOUT = common.platformTimeout(5000);
const messages = [
Buffer.from('First message to send'),
Buffer.from('Second message to send'),
Buffer.from('Third message to send'),
Buffer.from('Fourth message to send')
];
const workers = {};
const listeners = 3;
let listening, sendSocket, done, timer, dead;
// Skip test in FreeBSD jails.
if (common.inFreeBSDJail) {
common.skip('In a FreeBSD jail');
return;
}
function launchChildProcess() {
const worker = fork(__filename, ['child']);
workers[worker.pid] = worker;
worker.messagesReceived = [];
// Handle the death of workers.
worker.on('exit', function(code) {
// Don't consider this the true death if the worker has finished
// successfully or if the exit code is 0.
if (worker.isDone || code === 0) {
return;
}
dead += 1;
console.error('[PARENT] Worker %d died. %d dead of %d',
worker.pid,
dead,
listeners);
if (dead === listeners) {
console.error('[PARENT] All workers have died.');
console.error('[PARENT] Fail');
process.exit(1);
}
});
worker.on('message', function(msg) {
if (msg.listening) {
listening += 1;
if (listening === listeners) {
// All child process are listening, so start sending.
sendSocket.sendNext();
}
return;
}
if (msg.message) {
worker.messagesReceived.push(msg.message);
if (worker.messagesReceived.length === messages.length) {
done += 1;
worker.isDone = true;
console.error('[PARENT] %d received %d messages total.',
worker.pid,
worker.messagesReceived.length);
}
if (done === listeners) {
console.error('[PARENT] All workers have received the ' +
'required number of messages. Will now compare.');
Object.keys(workers).forEach(function(pid) {
const worker = workers[pid];
let count = 0;
worker.messagesReceived.forEach(function(buf) {
for (let i = 0; i < messages.length; ++i) {
if (buf.toString() === messages[i].toString()) {
count++;
break;
}
}
});
console.error('[PARENT] %d received %d matching messages.',
worker.pid, count);
assert.strictEqual(count, messages.length,
'A worker received an invalid multicast message');
});
clearTimeout(timer);
console.error('[PARENT] Success');
killChildren(workers);
}
}
});
}
function killChildren(children) {
Object.keys(children).forEach(function(key) {
const child = children[key];
child.kill();
});
}
if (process.argv[2] !== 'child') {
listening = 0;
dead = 0;
let i = 0;
done = 0;
// Exit the test if it doesn't succeed within TIMEOUT.
timer = setTimeout(function() {
console.error('[PARENT] Responses were not received within %d ms.',
TIMEOUT);
console.error('[PARENT] Fail');
killChildren(workers);
process.exit(1);
}, TIMEOUT);
// Launch child processes.
for (let x = 0; x < listeners; x++) {
launchChildProcess(x);
}
sendSocket = dgram.createSocket('udp4');
// The socket is actually created async now.
sendSocket.on('listening', function() {
sendSocket.setTTL(1);
sendSocket.setBroadcast(true);
sendSocket.setMulticastTTL(1);
sendSocket.setMulticastLoopback(true);
});
sendSocket.on('close', function() {
console.error('[PARENT] sendSocket closed');
});
sendSocket.sendNext = function() {
const buf = messages[i++];
if (!buf) {
try { sendSocket.close(); } catch (e) {}
return;
}
sendSocket.send(
buf,
0,
buf.length,
common.PORT,
LOCAL_BROADCAST_HOST,
function(err) {
assert.ifError(err);
console.error('[PARENT] sent "%s" to %s:%s',
buf.toString(),
LOCAL_BROADCAST_HOST, common.PORT);
process.nextTick(sendSocket.sendNext);
}
);
};
}
if (process.argv[2] === 'child') {
const receivedMessages = [];
const listenSocket = dgram.createSocket({
type: 'udp4',
reuseAddr: true
});
listenSocket.on('listening', function() {
listenSocket.addMembership(LOCAL_BROADCAST_HOST);
listenSocket.on('message', function(buf, rinfo) {
console.error('[CHILD] %s received "%s" from %j', process.pid,
buf.toString(), rinfo);
receivedMessages.push(buf);
process.send({ message: buf.toString() });
if (receivedMessages.length === messages.length) {
// .dropMembership() not strictly needed but here as a sanity check.
listenSocket.dropMembership(LOCAL_BROADCAST_HOST);
process.nextTick(function() {
listenSocket.close();
});
}
});
listenSocket.on('close', function() {
// HACK: Wait to exit the process to ensure that the parent
// process has had time to receive all messages via process.send()
// This may be indicative of some other issue.
setTimeout(function() {
process.exit();
}, common.platformTimeout(1000));
});
process.send({ listening: true });
});
listenSocket.bind(common.PORT);
}
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