Listening.php

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<?php
/**
* Streams library
* Copyright (c) 2012, Remco Pander
*
* This library consists of a set of classes that can be used to create high-performing
* applications using full-duplex connections. It uses the built-in stream functions
* provided with php.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
* @package    Streams
* @author     Remco Pander <[email protected]>
* @version    v1 initial release
* @copyright  Copyright (c) 2012, Remco Pander
*/

namespace Streams;
use \LogicException;
use \InvalidArgumentException;

class Listening
{        
        // Global constants
        const CERT_FILE_PATH   ='./';
        
        // Stream details
        private $r_Socket      = null;
        private $i_Status      = 0;
        private $s_lAddress    = null;
        private $i_lPort       = 0;
        private $i_listenStart = 0;
        private $i_Accepted    = 0;
        private $b_Secure      = false;
        
        // Callbacks
        public  $onAccept      = null;
        public  $onTerminate   = null;
        public  $onError       = null;
        
        public function __construct ($i_Port = 0, $s_Address = null, $b_Secure = false)
        {
                if ($b_Secure)
                {
                        if (!extension_loaded ('openssl'))
                        {
                                throw new LogicException ('Cannot create secure connection withouth the OpenSSL extension loaded.');
                        }
                        
                        if (!file_exists (self :: CERT_FILE_PATH))
                        {
                                throw new LogicException ('Cannot create secure connection withouth a certificate file.');
                        }
                }
                
                $this -> i_lPort    = $i_Port;
                $this -> s_lAddress = null;
                $this -> b_Secure   = $b_Secure;
        }
        
        public function isListening ()
        {
                return ($this -> i_Status == Status :: LISTENING);
        }
        
        public function getStatus ()
        {
                return $this -> i_Status;
        }
        
        public function getAcceptedCount ()
        {
                return $this -> i_Accepted;
        }
        
        public function getListenStarted ()
        {
                return $this -> i_listenStart;
        }
        
        public function getListenPort ()
        {
                return $this -> i_lPort;
        }
        
        public function getLocalAddress ()
        {
                if (!$this -> isListening ())
                {
                        throw new LogicException ('Cannot retrieve local address on stream that is not listening.');
                }
                
                return stream_socket_get_name ($this -> r_Socket, false);
        }
        
        // Start listening on the given port and address
        public function listen ()
        {
                if ($this -> isListening ())
                {
                        return true;
                }
                
                $s_Scheme = 'tcp://';
                $a_Opts   = array ();
                
                // Set options for ssl connection
                if ($this -> b_Secure)
                {
                        $s_Scheme       = 'ssl://';
                        $a_Opts ['ssl'] = array ('verify_peer'       => false,
                                                 'allow_self_signed' => true,
                                                 'cert_file'         => self :: CERT_FILE_PATH,
                                                 'passphrase'        => ''
                                                );
                }
                
                $i_Flags          = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN;
                $r_Context        = stream_context_create ($a_Opts);
                $this -> r_Socket = stream_socket_server  ($s_Scheme . $this -> s_lAddress . ':' . $this -> i_lPort, $i_Errno, $s_Errstr, $i_Flags, $r_Context);
                
                // Check if we succeeded
                if (!is_resource ($this -> r_Socket))
                {
                        $this -> i_Status = Status :: ERROR;
                        $this -> _doCallback ('onError', array ($this, Error :: INITFAILED));
                        return false;
                }
                
                // Change blocking status
                stream_set_blocking ($this -> r_Socket, false);
                $this -> i_Status      = Status :: LISTENING;
                $this -> i_listenStart = time ();
                
                // Fetch the port on which we are listening now..
                if ($this -> i_lPort == 0)
                {
                        $this -> i_lPort = substr ($this -> getLocalAddress (), strrpos ($this -> getLocalAddress (), ':'));
                }
                
                // Add to poller
                Poller :: getInstance () -> addConnection ($this -> r_Socket, $this);
                
                return true;
        }
        
        // Stop listening
        public function terminate ()
        {
                if (!$this -> isListening ())
                {
                        return true;
                }
                
                // Close stream
                $this -> _forceClose ();
                $this -> i_Status = Status :: DISCONNECTED_LOCAL;
                $this -> i_listenStart = 0;
                $this -> _doCallback ('onTerminate', array ($this));
                
                return true;
        }
        
        // Accept an incoming connection and pass it on to the callback function
        public function accept ()
        {
                if (!$this -> isListening ())
                {
                        throw new RuntimeException ('Cannot accept on a stream that is not listening.');
                }
                
                // Fetch the resource
                if (($r_Socket = stream_socket_accept ($this -> r_Socket, 0, $s_Address)) == false)
                {
                        $this -> _doCallback ('onError', array ($this, Error :: ACCEPTERR));
                        return false;
                }
                
                $o_Socket = new Accept ($r_Socket, $s_Address, $this -> b_Secure);
                $this -> i_Accepted++;
                
                // Callback,
                // if it has none, disconnect the accepted connection and remove it.
                if (isset ($this -> $s_Event) && is_callable ($this -> $s_Event))
                {
                        Poller :: getInstance () -> addConnection ($r_Socket, $o_Socket);
                        $this -> _doCallback ('onAccept', array ($this, $o_Socket));
                } else
                {
                        $o_Socket -> disconnect ();
                        unset ($o_Socket);
                }
                
                return true;
        }
        
        // Private function to close the resource
        private function _forceClose ()
        {
                if (!is_resource ($this -> r_Socket))
                {
                        return;
                }
                                
                // Close the socket resource
                stream_socket_shutdown ($this -> r_Socket, STREAM_SHUT_RDWR);
                fclose                 ($this -> r_Socket);                
                $this -> r_Socket        = null;
                $this -> i_listenStart   = 0;
                
                // Remove from poller
                Poller :: getInstance () -> removeConnection ($this);
        }
        
        // Attempts to callback to someone
        private function _doCallback ($s_Event, array $a_Args = array ())
        {
                if (isset ($this -> $s_Event) && is_callable ($this -> $s_Event))
                {
                        call_user_func_array ($this -> $s_Event, $a_Args);
                }
                
                return;
        }
}

 
 

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