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'use strict';
var common = require('../common');
var assert = require('assert');
var http = require('http');
var net = require('net');
var spawn = require('child_process').spawn;
if (common.isWindows) {
common.skip('This test is disabled on windows.');
return;
}
switch (process.argv[2]) {
case 'child': return child();
case 'parent': return parent();
default: return test();
}
// spawn the parent, and listen for it to tell us the pid of the child.
// 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.
function test() {
var parent = spawn(process.execPath, [__filename, 'parent'], {
stdio: [ 0, 'pipe', 2 ]
});
var json = '';
parent.stdout.on('data', function(c) {
json += c.toString();
if (json.indexOf('\n') !== -1) next();
});
function next() {
console.error('output from parent = %s', json);
var child = JSON.parse(json);
// now make sure that we can request to the child, then kill it.
http.get({
server: 'localhost',
port: child.port,
path: '/',
}).on('response', function(res) {
var s = '';
res.on('data', function(c) {
s += c.toString();
});
res.on('end', function() {
// kill the child before we start doing asserts.
// it's really annoying when tests leave orphans!
process.kill(child.pid, 'SIGKILL');
try {
parent.kill();
} catch (e) {}
assert.equal(s, 'hello from child\n');
assert.equal(res.statusCode, 200);
});
});
}
}
// Listen on port, and then pass the handle to the detached child.
// Then output the child's pid, and immediately exit.
function parent() {
var server = net.createServer(function(conn) {
conn.end('HTTP/1.1 403 Forbidden\r\n\r\nI got problems.\r\n');
throw new Error('Should not see connections on parent');
}).listen(0, function() {
console.error('server listening on %d', this.address().port);
var child = spawn(process.execPath, [__filename, 'child'], {
stdio: [ 0, 1, 2, server._handle ],
detached: true
});
console.log('%j\n', { pid: child.pid, port: this.address().port });
// Now close the parent, so that the child is the only thing
// referencing that handle. Note that connections will still
// be accepted, because the child has the fd open, but the parent
// will exit gracefully.
server.close();
child.unref();
});
}
// Run as a child of the parent() mode.
function child() {
// start a server on fd=3
http.createServer(function(req, res) {
console.error('request on child');
console.error('%s %s', req.method, req.url, req.headers);
res.end('hello from child\n');
}).listen({ fd: 3 }, function() {
console.error('child listening on fd=3');
});
}