nodejs/test/simple/test-http-parser-bad-ref.js

// Run this program with valgrind or efence with --expose_gc to expose the
// problem.

// Flags: --expose_gc

var assert = require('assert');
var HTTPParser = process.binding('http_parser').HTTPParser;

var headersComplete = 0;
var messagesComplete = 0;

function flushPool() {
  new Buffer(Buffer.poolSize - 1);
  gc();
}

function demoBug(part1, part2) {
  var parser = new HTTPParser('REQUEST');

  parser.headers = [];
  parser.url = '';

  parser.onHeaders = function(headers, url) {
    parser.headers = parser.headers.concat(headers);
    parser.url += url;
  };

  parser.onHeadersComplete = function(info) {
    headersComplete++;
    console.log("url", info.url);
  };

  parser.onBody = function(b, start, len) { };

  parser.onMessageComplete = function() {
    messagesComplete++;
  };


  // We use a function to eliminate references to the Buffer b
  // We want b to be GCed. The parser will hold a bad reference to it.
  (function() {
    var b = Buffer(part1);
    flushPool();

    console.log("parse the first part of the message");
    parser.execute(b, 0, b.length);
  })();

  flushPool();

  (function() {
    var b = Buffer(part2);

    console.log("parse the second part of the message");
    parser.execute(b, 0, b.length);
    parser.finish();
  })();
}


demoBug('POST /1', '/22 HTTP/1.1\r\n' +
        'Content-Type: text/plain\r\n' +
        'Content-Length: 4\r\n\r\n' +
        'pong');


process.on('exit', function() {
  assert.equal(1, headersComplete);
  assert.equal(1, messagesComplete);
  console.log("done!");
});