postal.js/example/node/node_modules/socket.io/lib/transports/http-polling.js

/*!
 * socket.io-node
 * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module requirements.
 */

var HTTPTransport = require( './http' );

/**
 * Exports the constructor.
 */

exports = module.exports = HTTPPolling;

/**
 * HTTP polling constructor.
 *
 * @api public.
 */

function HTTPPolling( mng, data, req ) {
	HTTPTransport.call( this, mng, data, req );
}
;

/**
 * Inherits from HTTPTransport.
 *
 * @api public.
 */

HTTPPolling.prototype.__proto__ = HTTPTransport.prototype;

/**
 * Transport name
 *
 * @api public
 */

HTTPPolling.prototype.name = 'httppolling';

/**
 * Removes heartbeat timeouts for polling.
 */

HTTPPolling.prototype.setHeartbeatInterval = function () {
	return this;
};

/**
 * Handles a request
 *
 * @api private
 */

HTTPPolling.prototype.handleRequest = function ( req ) {
	HTTPTransport.prototype.handleRequest.call( this, req );

	if ( req.method == 'GET' ) {
		var self = this;

		this.pollTimeout = setTimeout( function () {
			self.packet( { type : 'noop' } );
			self.log.debug( self.name + ' closed due to exceeded duration' );
		}, this.manager.get( 'polling duration' ) * 1000 );

		this.log.debug( 'setting poll timeout' );
	}
};

/**
 * Clears polling timeout
 *
 * @api private
 */

HTTPPolling.prototype.clearPollTimeout = function () {
	if ( this.pollTimeout ) {
		clearTimeout( this.pollTimeout );
		this.pollTimeout = null;
		this.log.debug( 'clearing poll timeout' );
	}

	return this;
};

/**
 * Override clear timeouts to clear the poll timeout
 *
 * @api private
 */

HTTPPolling.prototype.clearTimeouts = function () {
	HTTPTransport.prototype.clearTimeouts.call( this );

	this.clearPollTimeout();
};

/**
 * doWrite to clear poll timeout
 *
 * @api private
 */

HTTPPolling.prototype.doWrite = function () {
	this.clearPollTimeout();
};

/**
 * Performs a write.
 *
 * @api private.
 */

HTTPPolling.prototype.write = function ( data, close ) {
	this.doWrite( data );
	this.response.end();
	this.onClose();
};

/**
 * Override end.
 *
 * @api private
 */

HTTPPolling.prototype.end = function () {
	this.clearPollTimeout();
	return HTTPTransport.prototype.end.call( this );
};