<commit_before>
/**
 * Module dependencies.
 */

var ws = require('websocket.io')
  , qs = require('querystring')
  , parse = require('url').parse
  , readFileSync = require('fs').readFileSync
  , transports = require('./transports')
  , debug = require('debug')('engine')
  , EventEmitter = require('events').EventEmitter
  , Socket = require('./socket')

/**
 * Module exports.
 */

module.exports = Server;

/**
 * Server constructor.
 *
 * @param {Object} options
 * @api public
 */

function Server (opts) {
  this.clients = {};
  this.clientsCount = 0;

  opts = opts || {};
  this.pingTimeout = opts.pingTimeout || 10000;
  this.pingInterval = opts.pingInterval || 30000;
  this.transports = opts.transports || Object.keys(transports);
  this.allowUpgrades = false !== opts.allowUpgrades;

  // initialize websocket server
  if (~this.transports.indexOf('websocket')) {
    this.ws = new ws.Server;
    this.ws.on('connection', this.onWebSocket.bind(this));
  }
};

/**
 * Inherits from EventEmitter.
 */

Server.prototype.__proto__ = EventEmitter.prototype;

/**
 * Hash of open clients.
 *
 * @api public
 */

Server.prototype.clients;

/**
 * Returns a list of available transports for upgrade given a certain transport.
 *
 * @return {Array}
 * @api public
 */

Server.prototype.upgrades = function (transport) {
  if (!this.allowUpgrades) return [];
  return transports[transport].upgradesTo || [];
};

/**
 * Verifies a request.
 *
 * @param {http.ServerRequest}
 * @return {Boolean} whether the request is valid
 * @api private
 */

Server.prototype.verify = function (req) {
  // transport check
  var transport = req.query.transport;
  if (!~this.transports.indexOf(transport)) {
    debug('unknown transport "%s"', transport);
    return false;
  }

  // sid check
  if (req.query.sid) {
    return this.clients.hasOwnProperty(req.query.sid);
  } else {
    // handshake is GET only
    return 'GET' == req.method;
  }

  return true;
};

/**
 * Prepares a request by processing the query string.
 * 
 * @api private
 */

Server.prototype.prepare = function (req) {
  // try to leverage pre-existing `req.query` (e.g: from connect)
  if (!req.query) {
    req.query = ~req.url.indexOf('?')
      ? qs.parse(parse(req.url).query)
      : {};
  }
};

/**
 * Generates an id.
 *
 * @api private
 */

Server.prototype.id = function () {
  return String(Math.random() * Math.random()).substr(3);
};

/**
 * Closes all clients.
 *
 * @api public
 */

Server.prototype.close = function () {
  debug('closing all open clients');
  for (var i in this.clients) {
    this.clients[i].close();
  }
  return this;
};

/**
 * Handles an Engine.IO HTTP request.
 *
 * @param {http.ServerRequest} request
 * @param {http.ServerResponse|http.OutgoingMessage} response
 * @api public
 */

Server.prototype.handleRequest = function (req, res) {
  debug('handling "%s" http request "%s"', req.method, req.url);
  this.prepare(req);
  req.res = res;

  if (!this.verify(req)) {
    res.writeHead(500);
    res.end();
    return this;
  }

  if (req.query.sid) {
    debug('seting new request for existing client');
    this.clients[req.query.sid].transport.onRequest(req);
  } else {
    this.handshake(req.query.transport, req);
  }

  return this;
};

/**
 * Handshakes a new client.
 *
 * @param {String} transport name
 * @param {Object} request object
 * @api private
 */

Server.prototype.handshake = function (transport, req) {
  var id = this.id()
    , socket = new Socket(id, this, new transports[transport](req))
    , self = this

  debug('handshaking client "%d"', id);
  this.clients[id] = socket;
  this.clientsCount++;
  this.emit('connection', socket);

  socket.once('close', function () {
    delete self.clients[id];
    self.clientsCount--;
  });<commit_msg>Avoid incorrect debug output order.<commit_after>
/**
 * Module dependencies.
 */

var ws = require('websocket.io')
  , qs = require('querystring')
  , parse = require('url').parse
  , readFileSync = require('fs').readFileSync
  , transports = require('./transports')
  , debug = require('debug')('engine')
  , EventEmitter = require('events').EventEmitter
  , Socket = require('./socket')

/**
 * Module exports.
 */

module.exports = Server;

/**
 * Server constructor.
 *
 * @param {Object} options
 * @api public
 */

function Server (opts) {
  this.clients = {};
  this.clientsCount = 0;

  opts = opts || {};
  this.pingTimeout = opts.pingTimeout || 10000;
  this.pingInterval = opts.pingInterval || 30000;
  this.transports = opts.transports || Object.keys(transports);
  this.allowUpgrades = false !== opts.allowUpgrades;

  // initialize websocket server
  if (~this.transports.indexOf('websocket')) {
    this.ws = new ws.Server;
    this.ws.on('connection', this.onWebSocket.bind(this));
  }
};

/**
 * Inherits from EventEmitter.
 */

Server.prototype.__proto__ = EventEmitter.prototype;

/**
 * Hash of open clients.
 *
 * @api public
 */

Server.prototype.clients;

/**
 * Returns a list of available transports for upgrade given a certain transport.
 *
 * @return {Array}
 * @api public
 */

Server.prototype.upgrades = function (transport) {
  if (!this.allowUpgrades) return [];
  return transports[transport].upgradesTo || [];
};

/**
 * Verifies a request.
 *
 * @param {http.ServerRequest}
 * @return {Boolean} whether the request is valid
 * @api private
 */

Server.prototype.verify = function (req) {
  // transport check
  var transport = req.query.transport;
  if (!~this.transports.indexOf(transport)) {
    debug('unknown transport "%s"', transport);
    return false;
  }

  // sid check
  if (req.query.sid) {
    return this.clients.hasOwnProperty(req.query.sid);
  } else {
    // handshake is GET only
    return 'GET' == req.method;
  }

  return true;
};

/**
 * Prepares a request by processing the query string.
 * 
 * @api private
 */

Server.prototype.prepare = function (req) {
  // try to leverage pre-existing `req.query` (e.g: from connect)
  if (!req.query) {
    req.query = ~req.url.indexOf('?')
      ? qs.parse(parse(req.url).query)
      : {};
  }
};

/**
 * Generates an id.
 *
 * @api private
 */

Server.prototype.id = function () {
  return String(Math.random() * Math.random()).substr(3);
};

/**
 * Closes all clients.
 *
 * @api public
 */

Server.prototype.close = function () {
  debug('closing all open clients');
  for (var i in this.clients) {
    this.clients[i].close();
  }
  return this;
};

/**
 * Handles an Engine.IO HTTP request.
 *
 * @param {http.ServerRequest} request
 * @param {http.ServerResponse|http.OutgoingMessage} response
 * @api public
 */

Server.prototype.handleRequest = function (req, res) {
  debug('handling "%s" http request "%s"', req.method, req.url);
  this.prepare(req);
  req.res = res;

  if (!this.verify(req)) {
    res.writeHead(500);
    res.end();
    return this;
  }

  if (req.query.sid) {
    debug('seting new request for existing client');
    this.clients[req.query.sid].transport.onRequest(req);
  } else {
    this.handshake(req.query.transport, req);
  }

  return this;
};

/**
 * Handshakes a new client.
 *
 * @param {String} transport name
 * @param {Object} request object
 * @api private
 */

Server.prototype.handshake = function (transport, req) {
  var id = this.id();

  debug('handshaking client "%d"', id);

  var socket = new Socket(id, this, new transports[transport](req))
    , self = this

  this.clients[id] = socket;
  this.clientsCount++;
  this.emit('connection', socket);

  socket.once('close', function () {
    delete self.clients[id];
    self.clientsCount--;
  });
{'fraction_non_alphanumeric': 0.16382838283828383, 'fraction_numerical': 0.0039603960396039604, 'mean_word_length': 3.309442548350398, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '6132918', 'n_tokens_mistral': 2512, 'n_tokens_neox': 2459, 'n_words': 581}