'use strict'; const common = require('../common'); const assert = require('assert'); const dgram = require('dgram'); const util = require('util'); const networkInterfaces = require('os').networkInterfaces(); const Buffer = require('buffer').Buffer; const fork = require('child_process').fork; const LOCAL_BROADCAST_HOST = '255.255.255.255'; 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') ]; if (common.inFreeBSDJail) { common.skip('in a FreeBSD jail'); return; } // Take the first non-internal interface as the address for binding. // Ideally, this should check for whether or not an interface is set up for // BROADCAST and favor internal/private interfaces. get_bindAddress: for (var name in networkInterfaces) { var interfaces = networkInterfaces[name]; for (var i = 0; i < interfaces.length; i++) { var localInterface = interfaces[i]; if (!localInterface.internal && localInterface.family === 'IPv4') { var bindAddress = localInterface.address; break get_bindAddress; } } } assert.ok(bindAddress); if (process.argv[2] !== 'child') { const workers = {}; const listeners = 3; let listening = 0; let dead = 0; let i = 0; let done = 0; let timer = null; //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 (var x = 0; x < listeners; x++) { (function() { var worker = fork(process.argv[1], ['child']); workers[worker.pid] = worker; worker.messagesReceived = []; //handle the death of workers worker.on('exit', function(code, signal) { // 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'); killChildren(workers); 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(); } } else 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) { var worker = workers[pid]; var count = 0; worker.messagesReceived.forEach(function(buf) { for (var i = 0; i < messages.length; ++i) { if (buf.toString() === messages[i].toString()) { count++; break; } } }); console.error('[PARENT] %d received %d matching messges.', worker.pid, count); assert.equal(count, messages.length, 'A worker received an invalid multicast message'); }); clearTimeout(timer); console.error('[PARENT] Success'); killChildren(workers); } } }); })(x); } var sendSocket = dgram.createSocket({ type: 'udp4', reuseAddr: true }); // bind the address explicitly for sending // INADDR_BROADCAST to only one interface sendSocket.bind(common.PORT, bindAddress); sendSocket.on('listening', function() { sendSocket.setBroadcast(true); }); sendSocket.on('close', function() { console.error('[PARENT] sendSocket closed'); }); sendSocket.sendNext = function() { var buf = messages[i++]; if (!buf) { try { sendSocket.close(); } catch (e) {} return; } sendSocket.send( buf, 0, buf.length, common.PORT, LOCAL_BROADCAST_HOST, function(err) { if (err) throw err; console.error('[PARENT] sent %s to %s:%s', util.inspect(buf.toString()), LOCAL_BROADCAST_HOST, common.PORT); process.nextTick(sendSocket.sendNext); } ); }; function killChildren(children) { Object.keys(children).forEach(function(key) { var child = children[key]; child.kill(); }); } } if (process.argv[2] === 'child') { var receivedMessages = []; var listenSocket = dgram.createSocket({ type: 'udp4', reuseAddr: true }); listenSocket.on('message', function(buf, rinfo) { // receive udp messages only sent from parent if (rinfo.address !== bindAddress) return; console.error('[CHILD] %s received %s from %j', process.pid, util.inspect(buf.toString()), rinfo); receivedMessages.push(buf); process.send({message: buf.toString()}); if (receivedMessages.length == messages.length) { 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 indicitave of some other issue. setTimeout(function() { process.exit(); }, 1000); }); listenSocket.on('listening', function() { process.send({listening: true}); }); listenSocket.bind(common.PORT); }