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Added line numbers to debug lines as this will become the 'norm'
[hub.git] / application / hub / main / discovery / socket / class_PackageSocketDiscovery.php
1 <?php
2 /**
3  * A socket discovery class
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Core Developer Team
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  */
24 class PackageSocketDiscovery extends BaseHubDiscovery implements DiscoverableSocket, Registerable {
25         /**
26          * Protected constructor
27          *
28          * @return      void
29          */
30         protected function __construct () {
31                 // Call parent constructor
32                 parent::__construct(__CLASS__);
33         }
34
35         /**
36          * Create an instance of this class
37          *
38          * @return      $discoveryInstance      An instance of this discovery class
39          */
40         public static final function createPackageSocketDiscovery () {
41                 // Get an instance of this class
42                 $discoveryInstance = new PackageSocketDiscovery();
43
44                 // Output debug message
45                 self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Initialized.');
46
47                 // Return the prepared instance
48                 return $discoveryInstance;
49         }
50
51         /**
52          * Tries to dicover the right listener instance
53          *
54          * @param       $protocolName           Protocol name
55          * @param       $packageData            Raw package data
56          * @return      $listenerInstance       An instance of a Listenable instance or null
57          */
58         public function discoverListenerInstance ($protocolName, array $packageData) {
59                 // Debug message
60                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: protocolName=' . $protocolName . ' - ENTERED!');
61
62                 /*
63                  * Get the listener pool instance, we need to lookup the matching
64                  * listener->poolInstance chain there.
65                  */
66                 $poolInstance = Registry::getRegistry()->getInstance('node')->getListenerPoolInstance();
67
68                 // Init listener instance
69                 $listenerInstance = NULL;
70
71                 /*
72                  * Now we need to choose again. It is whether we are speaking with a hub
73                  * or with a client. So just handle it over to all listeners in this
74                  * pool.
75                  */
76                 foreach ($poolInstance->getPoolEntriesInstance()->getArrayFromGroup($protocolName) as $listenerInstance) {
77                         // Debug output
78                         //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: protocolName=' . $protocolName . ',listenerInstance=' . $listenerInstance->__toString());
79
80                         // Does the listener want that package?
81                         if ($listenerInstance->ifListenerAcceptsPackageData($packageData)) {
82                                 // This listener likes our package data, so abort here
83                                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Listener is accepting package data.');
84                                 break;
85                         } // END - if
86
87                         // Debug output
88                         //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Listener is NOT accepting package data.');
89                 } // END - foreach
90
91                 // Return it
92                 return $listenerInstance;
93         }
94
95         /**
96          * Tries to discover the right socket for given package data and returns a
97          * matching socket resource for that protocol.
98          *
99          * @param       $packageData            Raw package data array
100          * @param       $connectionType         Type of connection, can be 'incoming' or 'outgoing', *NEVER* 'server'!
101          * @return      $socketResource         A valid socket resource or FALSE if an error occured
102          * @throws      NoListGroupException    If the procol group is not found in peer list
103          * @throws      NullPointerException    If listenerInstance is NULL
104          */
105         public function discoverSocket (array $packageData, $connectionType) {
106                 // Assert on type
107                 assert($connectionType != BaseConnectionHelper::CONNECTION_TYPE_SERVER);
108
109                 // Determine protocol name
110                 $protocolName = $this->determineProtocolByPackageData($packageData);
111
112                 // Is it the same?
113                 assert(strtoupper($protocolName) == $packageData[NetworkPackage::PACKAGE_DATA_PROTOCOL]);
114
115                 // Get the listener instance
116                 $listenerInstance = $this->discoverListenerInstance($protocolName, $packageData);
117
118                 // If there is no listener who wants to have that package, we simply drop it here
119                 if (is_null($listenerInstance)) {
120                         // Abort with no resource
121                         throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
122                 } // END - if
123
124                 // Debug message
125                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('protocolName=' . $protocolName . ',packageData=' . print_r($packageData, true));
126
127                 /*
128                  * Now we have the listener instance, we can determine the right
129                  * resource to continue. The first step is to get the attached pool
130                  * instance and pass over the whole package data to get the right
131                  * socket.
132                  */
133                 $socketResource = $listenerInstance->getPoolInstance()->getSocketFromPackageData($packageData, $connectionType);
134
135                 // Debug message
136                 if (is_resource($socketResource)) {
137                         //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('socketResource[' . gettype($socketResource) . ']=' . $socketResource . ',error=' . socket_strerror(socket_last_error($socketResource)) . ',packageData=' . print_r($packageData, true));
138                 } else {
139                         //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('socketResource[' . gettype($socketResource) . ']=' . $socketResource . ',packageData=' . print_r($packageData, true));
140                 }
141
142                 // Is it false, the recipient isn't known to us and we have no connection to it
143                 if (($socketResource === false) || (!is_resource($socketResource)) || (socket_last_error($socketResource) > 0)) {
144                         // Try to create a new socket resource
145                         try {
146                                 // Possibly noisy debug message
147                                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Trying to establish a ' . strtoupper($protocolName) . ' connection to ' . $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ' ...');
148
149                                 // Get a socket resource from our factory (if succeeded)
150                                 $socketResource = SocketFactory::createSocketFromPackageData($packageData, $protocolName);
151                         } catch (SocketConnectionException $e) {
152                                 // The connection fails of being established, so log it away
153                                 self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Caught ' . $e->__toString() . ',message=' . $e->getMessage());
154                         }
155                 } // END - if
156
157                 // Try to resolve the socket resource
158                 try {
159                         // Get the helper instance from registry
160                         $helperInstance = Registry::getRegistry()->getInstance('connection');
161
162                         // Possibly noisy debug message
163                         /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Going to resolve socket from peer state and given package data ...');
164
165                         // Resolve the peer's state (but ignore return value)
166                         PeerStateResolver::resolveStateByPackage($helperInstance, $packageData, $socketResource);
167                 } catch (InvalidSocketException $e) {
168                         // This cannot be fixed, so log it away
169                         self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: Cannot discover socket resource for recipient ' . $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ': ' . $e->getMessage());
170
171                         // Make any failed attempts to 'false'
172                         $socketResource = false;
173                 }
174
175                 // And return it
176                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('SOCKET-DISCOVERY[' . __LINE__ . ']: socketResource=' . $socketResource . ',packageData=' . print_r($packageData, true));
177                 return $socketResource;
178         }
179 }
180
181 // [EOF]
182 ?>