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'use strict';
var common = require('../common');
var assert = require('assert');
var http = require('http');
var net = require('net');
var cluster = require('cluster');
console.error('Cluster listen fd test', process.argv[2] || 'runner');
if (common.isWindows) {
common.skip('This test is disabled on windows.');
return;
}
// Process relationship is:
//
// parent: the test main script
// -> master: the cluster master
// -> worker: the cluster worker
switch (process.argv[2]) {
case 'master': return master();
case 'worker': return worker();
}
var ok;
process.on('exit', function() {
assert.ok(ok);
});
// spawn the parent, and listen for it to tell us the pid of the cluster.
// WARNING: This is an example of listening on some arbitrary FD number
// that has already been bound elsewhere in advance. However, binding
// server handles to stdio fd's is NOT a good or reliable way to do
// concurrency in HTTP servers! Use the cluster module, or if you want
// a more low-level approach, use child process IPC manually.
test(function(parent, port) {
// now make sure that we can request to the worker, then kill it.
http.get({
server: 'localhost',
port: port,
path: '/',
}).on('response', function(res) {
var s = '';
res.on('data', function(c) {
s += c.toString();
});
res.on('end', function() {
// kill the worker before we start doing asserts.
// it's really annoying when tests leave orphans!
parent.kill();
parent.on('exit', function() {
assert.equal(s, 'hello from worker\n');
assert.equal(res.statusCode, 200);
console.log('ok');
ok = true;
});
});
});
});
function test(cb) {
console.error('about to listen in parent');
var server = net.createServer(function(conn) {
console.error('connection on parent');
conn.end('hello from parent\n');
}).listen(0, function() {
const port = this.address().port;
console.error('server listening on %d', port);
var spawn = require('child_process').spawn;
var master = spawn(process.execPath, [__filename, 'master'], {
stdio: [ 0, 'pipe', 2, server._handle, 'ipc' ],
detached: true
});
// Now close the parent, so that the master is the only thing
// referencing that handle. Note that connections will still
// be accepted, because the master has the fd open.
server.close();
master.on('exit', function(code) {
console.error('master exited', code);
});
master.on('close', function() {
console.error('master closed');
});
console.error('master spawned');
master.on('message', function(msg) {
if (msg === 'started worker') {
cb(master, port);
}
});
});
}
function master() {
console.error('in master, spawning worker');
cluster.setupMaster({
args: [ 'worker' ]
});
var worker = cluster.fork();
worker.on('message', function(msg) {
if (msg === 'worker ready') {
process.send('started worker');
}
});
// Prevent outliving our parent process in case it is abnormally killed -
// under normal conditions our parent kills this process before exiting.
process.on('disconnect', function() {
console.error('master exit on disconnect');
process.exit(0);
});
}
function worker() {
console.error('worker, about to create server and listen on fd=3');
// start a server on fd=3
http.createServer(function(req, res) {
console.error('request on worker');
console.error('%s %s', req.method, req.url, req.headers);
res.end('hello from worker\n');
}).listen({ fd: 3 }, function() {
console.error('worker listening on fd=3');
process.send('worker ready');
});
}
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