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'use strict';
const common = require('../common');
const assert = require('assert');
// Here we are testing the HTTP server module's flood prevention mechanism.
// When writeable.write returns false (ie the underlying send() indicated the
// native buffer is full), the HTTP server cork()s the readable part of the
// stream. This means that new requests will not be read (however request which
// have already been read, but are awaiting processing will still be
// processed).
// Normally when the writable stream emits a 'drain' event, the server then
// uncorks the readable stream, although we arent testing that part here.
// The issue being tested exists in Node.js 0.10.20 and is resolved in 0.10.21
// and newer.
switch (process.argv[2]) {
case undefined:
return parent();
case 'child':
return child();
default:
throw new Error(`Unexpected value: ${process.argv[2]}`);
}
function parent() {
const http = require('http');
const bigResponse = new Buffer(10240).fill('x');
var requests = 0;
var connections = 0;
var backloggedReqs = 0;
const server = http.createServer(function(req, res) {
requests++;
res.setHeader('content-length', bigResponse.length);
if (!res.write(bigResponse)) {
if (backloggedReqs === 0) {
// Once the native buffer fills (ie write() returns false), the flood
// prevention should kick in.
// This means the stream should emit no more 'data' events. However we
// may still be asked to process more requests if they were read before
// the flood-prevention mechanism activated.
setImmediate(() => {
req.socket.on('data', () => common.fail('Unexpected data received'));
});
}
backloggedReqs++;
}
res.end();
});
server.on('connection', function(conn) {
connections++;
});
server.listen(common.PORT, function() {
const spawn = require('child_process').spawn;
const args = [__filename, 'child'];
const child = spawn(process.execPath, args, { stdio: 'inherit' });
child.on('close', common.mustCall(function() {
server.close();
}));
server.setTimeout(200, common.mustCall(function() {
child.kill();
}));
});
process.on('exit', function() {
assert.equal(connections, 1);
});
}
function child() {
const net = require('net');
const conn = net.connect({ port: common.PORT });
var req = 'GET / HTTP/1.1\r\nHost: localhost:' +
common.PORT + '\r\nAccept: */*\r\n\r\n';
req = new Array(10241).join(req);
conn.on('connect', write);
// `drain` should fire once and only once
conn.on('drain', common.mustCall(write));
function write() {
while (false !== conn.write(req, 'ascii'));
}
}