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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 Connection
{
        // Global constants
        const CERT_FILE_PATH     = './';
        const CONN_MAX_TIME      = 5;
        
        // Connection details
        protected $r_Socket      = null;
        protected $i_Status      = 0;
        private $s_rAddress      = null;
        private $s_rPort         = null;
        private $b_Secure        = false;
        private $s_bindTo        = null;
        private $i_timeConnected = 0;
        
        // Buffers for data
        private  $readBuffer     = null;
        private  $writeBuffer    = null;
        
        // Callbacks
        public  $onConnect       = null;
        public  $onTerminate     = null;
        public  $onRead          = null;
        public  $onWrite         = null;
        public  $onError         = null;
        
        // Create a new connection
        public function __construct ($s_Address, $i_Port, $s_bindAddress = null, $b_Secure = false)
        {
                // Resolve address
                if (!@gethostbyname ($s_Address) && !@gethostbyaddr ($s_Address) || $i_Port > 65535 || $i_Port < 2)
                {
                        throw new InvalidArgumentException ('Address "' . $s_Address . ':' . $i_Port . '" could not be resolved or is invalid.');
                }
                
                $this -> s_rAddress = $s_Address;
                $this -> i_rPort    = $i_Port;
                $this -> s_bindTo   = $s_bindAddress;
                $this -> b_Secure   = $b_Secure;
                
                if ($this -> 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.');
                        }
                }
                
                // Create buffers
                $this -> readBuffer  = new StringBuffer ();
                $this -> writeBuffer = new StringBuffer ();
        }
        
        // Destructor, closes the connection if it is still open
        public function __destruct ()
        {
                // Check if we are connected.
                if ($this -> isConnected ())
                {
                        $this -> disconnect ();
                } else
                {
                        $this -> _forceClose ();
                }
                
                // Empty buffer
                $this -> readBuffer  = null;
                $this -> writeBuffer = null;
        }
        
        public function __get ($s_Member)
        {
                switch ($s_Member)
                {
                        case 'readBuffer':
                                return $this -> readBuffer;
                                
                        case 'writeBuffer':
                                return $this -> writeBuffer;
                                
                        default:
                                throw new LogicException ('Acces to "' . $s_Member . '" is not allowed.');
                }
        }
        
        // Returns address
        public function __toString ()
        {
                return $this -> s_rAddress . ':' . $this -> i_rPort;
        }
        
        // Returns the time we connected
        public function getTimeConnected ()
        {
                return $this -> i_timeConnected;
        }
        
        // Returns the current status
        public function getStatus ()
        {
                return $this -> i_Status;
        }
                
        // Returns whether the socket is connected or not
        public function isConnected ()
        {
                return ($this -> i_Status == Status :: CONNECTED);
        }
        
        // Returns whether this socket is using a secure connection
        public function isSecure ()
        {
                return $this -> b_Secure;
        }
        
        // Checks if the socket has data pending to write
        public function hasWriteBuffer ()
        {
                return $this -> writeBuffer -> hasBuffer ();
        }
        
        // Checks if the socket has data pending in its read buffer
        public function hasReadBuffer ()
        {
                return $this -> readBuffer -> hasBuffer ();
        }
                
        // Queries the remote machine to get it's address
        public function getRemoteAddress ()
        {
                if (!$this -> isConnected ())
                {
                        throw new LogicException ('Cannot receive remote address on socket that is not connected.');
                }
                
                return stream_socket_get_name ($this -> r_Socket, true);
        }
        
        // Queries the local machine to get it's address
        public function getLocalAddress ()
        {
                if (!$this -> isConnected ())
                {
                        throw new LogicException ('Cannot receive local address on socket that is not connected.');
                }
                
                return stream_socket_get_name ($this -> r_Socket, false);
        }
        
        // Sets the encoding for the stream
        public function setEncoding ($s_Encoding)
        {
                if (!function_exists ('mb_list_encodings')  || !in_array ($s_Encoding, mb_list_encodings ()))
                {
                        return false;
                }
                
                return stream_encoding ($this -> r_Socket, $s_Encoding);
        }
        
        // Sets the internal buffer's line endings to something else
        public function setLineEnding ($s_lineEnd)
        {
                $this -> readBuffer  -> setLineEnding ($s_lineEnd);
                $this -> writeBuffer -> setLineEnding ($s_lineEnd);
                
                return true;
        }
                
        // Connects to the remote machine
        public function connect ()
        {
                if ($this -> isConnected ())
                {
                        return true;
                }
                
                if ($this -> i_Status == Status :: CONNECTING)
                {
                        if (!feof ($this -> r_Socket))
                        {
                                $this -> i_Status        = Status :: CONNECTED;
                                $this -> i_timeConnected = time ();
                                $this -> _doCallback ('onConnect', array ($this, $this -> i_timeConnected));
                                
                                return true;
                        } else /** call from poller that connection failed **/
                        {
                                $this -> i_Status = Status :: ERROR;
                                $this -> _doCallback ('onError', array ($this, Error :: CONNFAILED));
                                
                                return false;
                        }
                }
                
                // Prepare context
                $a_Opts = array ();
                $s_Scheme = 'tcp://';
                
                // 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'        => ''
                                                );
                }
                
                // Set bind address
                if (!empty ($this -> s_bindTo))
                {
                        $a_Opts ['socket'] = array ('bindto' => $this -> s_bindTo);
                }

                // Now, create the actual resource.
                $i_Flags          = STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT;
                $r_Context        = stream_context_create ($a_Opts);
                $this -> r_Socket = stream_socket_client  ($s_Scheme . $this -> s_rAddress . ':' . $this -> i_rPort, $i_Errno, $s_Errstr, null, $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 :: CONNECTING;
                
                // Insert to our poller object
                Poller :: getInstance () -> addConnection ($this -> r_Socket, $this);
                
                return false;
        }
        
        // Terminates the connection to the remote machine
        public function disconnect ()
        {
                if (!$this -> isConnected ())
                {
                        return true;
                }
                
                // Check if there is data pending..
                if ($this -> writeBuffer -> hasBuffer ())
                {
                        // Bypass write () because we do not want to send any callbacks anymore
                        // and do not care for errors
                        if (($i_Written = @fwrite ($this -> r_Socket, $this -> writeBuffer -> getBuffer ())) !== false)
                        {
                                $this -> writeBuffer -> removeLength ($i_Written);
                        }        
                }
                
                // Close it.
                $this -> _forceClose ();
                $this -> i_Status = Status :: DISCONNECTED_LOCAL;
                $this -> _doCallback ('onTerminate', array ($this, Status :: DISCONNECTED_LOCAL));
                
                return true;
        }
        
        // Attempts to write data from the write buffer to the remote machine
        // Returns amount of bytes written or false
        public function write ()
        {
                if (!$this -> isConnected ())
                {
                        throw new LogicException ('Cannot perform write on socket that is not connected.');
                }
                
                if (($i_Written = fwrite ($this -> r_Socket, $this -> writeBuffer -> getBuffer ())) === false)
                {
                        $this -> i_Status = Status :: ERROR;
                        $this -> _forceClose ();
                        $this -> _doCallback ('onError', array ($this, Error :: WRITEERR));
                        
                        return false;                        
                }
                
                $this -> writeBuffer -> removeLength ($i_Written);
                $this -> _doCallback ('onWrite', array ($this, $this -> writeBuffer, $i_Written));
                
                return true;
        }
        
        // Read as much data from the stream as possible
        // Returns amount of bytes written or false
        public function read ()
        {
                if (!$this -> isConnected ())
                {
                        throw new LogicException ('Cannot perform read on socket that is not connected.');
                }
                
                // Check for end-of-file
                if (feof ($this -> r_Socket))
                {
                        $this -> _forceClose ();
                        $this -> i_Status = Status :: DISCONNECTED_REMOTE;
                        $this -> _doCallback ('onTerminate', array ($this, Status :: DISCONNECTED_REMOTE));
                        
                        return false;
                }
                
                // Perform read action..
                if (($s_readString = fread ($this -> r_Socket, 8192)) == false)
                {
                        $this -> i_Status = Status :: ERROR;
                        $this -> _forceClose ();
                        $this -> _doCallback ('onError', array ($this, Error :: READERR));
                        
                        return false;
                }
                
                // Append to read buffer
                $this -> readBuffer -> appendBuffer ($s_readString);
                $this -> _doCallback ('onRead', array ($this, $this -> readBuffer, strlen ($s_readString)));
                
                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_timeConnected = 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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