inc/classes/cachesystem.class.php

   1 <?php
   2 /************************************************************************
   3  * Mailer v0.2.1-FINAL                                Start: 10/22/2009 *
   4  * ===================                          Last change: 10/22/2009 *
   5  *                                                                      *
   6  * -------------------------------------------------------------------- *
   7  * File              : cachesystem.class.php                            *
   8  * -------------------------------------------------------------------- *
   9  * Short description : CacheSystem class                                *
  10  * -------------------------------------------------------------------- *
  11  * Kurzbeschreibung  : CacheSystem-Klasse                               *
  12  * -------------------------------------------------------------------- *
  13  * $Revision::                                                        $ *
  14  * $Date::                                                            $ *
  15  * $Tag:: 0.2.1-FINAL                                                 $ *
  16  * $Author::                                                          $ *
  17  * -------------------------------------------------------------------- *
  18  * Copyright (c) 2003 - 2009 by Roland Haeder                           *
  19  * Copyright (c) 2009 - 2011 by Mailer Developer Team                   *
  20  * For more information visit: http://www.mxchange.org                  *
  21  *                                                                      *
  22  * This program is free software; you can redistribute it and/or modify *
  23  * it under the terms of the GNU General Public License as published by *
  24  * the Free Software Foundation; either version 2 of the License, or    *
  25  * (at your option) any later version.                                  *
  26  *                                                                      *
  27  * This program is distributed in the hope that it will be useful,      *
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
  30  * GNU General Public License for more details.                         *
  31  *                                                                      *
  32  * You should have received a copy of the GNU General Public License    *
  33  * along with this program; if not, write to the Free Software          *
  34  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,               *
  35  * MA  02110-1301  USA                                                  *
  36  ************************************************************************/
  37
  38 // Some security stuff...
  39 if (!defined('__SECURITY')) {
  40         die();
  41 } // END - if
  42
  43 // Caching class
  44 class CacheSystem {
  45         // Status code
  46         var $statusCode = 'init';
  47
  48         // Full-qualified filename
  49         var $fqfn = '';
  50
  51         // Resource to cache file
  52         var $pointer = false;
  53
  54         // Data array from cache
  55         var $data = array();
  56
  57         // Version data from cache
  58         var $version = array();
  59
  60         // Cache name
  61         var $name = '';
  62         var $rebuilt = array();
  63
  64         // File extension
  65         var $extension = '.cache';
  66         var $status = array();
  67         var $readable = array();
  68         var $fullPath = '';
  69
  70         // Constructor
  71         function CacheSystem () {
  72                 // Construct full path
  73                 $this->fullPath = getPath() . getCachePath();
  74
  75                 // Failed is the default
  76                 $this->setStatusCode('failed');
  77
  78                 // Check if path exists
  79                 if (isDirectory($this->fullPath)) {
  80                         // Is there a .htaccess file?
  81                         if (isFileReadable($this->fullPath . '.htaccess')) {
  82                                 // All done!
  83                                 $this->setStatusCode('done');
  84                         } else {
  85                                 // Stop! Set a .htaccess file first
  86                                 $this->setStatusCode('htaccess');
  87                         }
  88                 } // END - if
  89         }
  90
  91         // Checks validity of cache file and if content is given
  92         function loadCacheFile ($cacheName) {
  93                 // Remember cache file
  94                 $this->name = $cacheName;
  95
  96                 // Construct FQFN (full qualified file name)
  97                 $this->fqfn = $this->fullPath . $cacheName . $this->extension;
  98
  99                 // Check if file exists and if version matches
 100                 if (!isset($this->status[$cacheName])) {
 101                         // Pre-fetch cache here if found
 102                         if ($this->isCacheReadable()) $this->getArrayFromCache();
 103
 104                         //* DEBUG: */ debugOutput('cacheName='.$cacheName.',isCacheReadable='.intval($this->isCacheReadable()).',is_writeable='.intval(is_writeable($this->fqfn)).',extensionMatches='.intval($this->extensionVersionMatches('cache')));
 105                         $this->status[$cacheName] = ($this->isCacheReadable() && (is_writeable($this->fqfn)) && ($this->extensionVersionMatches('cache')));
 106                 } // END - if
 107                 //* DEBUG: */ debugOutput('cacheName='.$cacheName.',status='.intval($this->status[$cacheName]));
 108
 109                 // Return status
 110                 return $this->status[$cacheName];
 111         }
 112
 113         // Initializes the cache file
 114         function init () {
 115                 // This will destory an existing cache file!
 116                 if ($this->getStatusCode() == 'done') {
 117                         // Reset read status
 118                         $this->resetCacheReadStatus();
 119
 120                         // Create file
 121                         if ($this->isCacheReadable()) changeMode($this->fqfn, 0666);
 122                         $this->pointer = fopen($this->fqfn, 'w') or debug_report_bug(__METHOD__, __LINE__, 'Cannot write to cache ' . $this->fqfn . ' !');
 123
 124                         // Add open PHP tag
 125                         $this->writeLine('<?php');
 126                 } else {
 127                         // Cannot create file
 128                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 129                 }
 130         }
 131
 132         /**
 133          * Writes a line to the pointer and adds a \n (new-line) to the end
 134          *
 135          * @access private
 136          */
 137         function writeLine ($line) {
 138                 // Is the pointer a valid resource?
 139                 if (is_resource($this->pointer)) {
 140                         // Write the line
 141                         fwrite($this->pointer, $line . "\n");
 142                 } else {
 143                         // Something bad happened
 144                         debug_report_bug(__METHOD__, __LINE__, 'Pointer type is ' . gettype($this->pointer) . ', expected is resource.');
 145                 }
 146         }
 147
 148         // Reset the read status
 149         function resetCacheReadStatus () {
 150                 unset($this->readable[$this->name]);
 151                 unset($GLOBALS['file_readable'][$this->fqfn]);
 152                 unset($this->status[$this->name]);
 153         }
 154
 155         function addRow ($data) {
 156                 // Is the pointe rvalid?
 157                 if (is_resource($this->pointer)) {
 158                         // Write every array element to cache file
 159                         foreach ($data as $k => $v) {
 160                                 // Write global cache array for immediate access
 161                                 if ((substr($k, 0, 4) == 'ext_') && (isset($data['ext_name'])) && (isset($data['ext_id']))) {
 162                                         if ($k == 'ext_name') {
 163                                                 $GLOBALS['cache_array']['extension'][$k][$data['ext_id']] = $v;
 164                                         } else {
 165                                                 $GLOBALS['cache_array']['extension'][$k][$data['ext_name']] = $v;
 166                                         }
 167                                         if (($k == 'ext_keep') && ($v == 'Y')) {
 168                                                 $GLOBALS['cache_array']['always_active'][$data['ext_name']] = $v;
 169                                         } // END - if
 170                                 } elseif ($this->name == 'config') {
 171                                         // Configuration
 172                                         $GLOBALS['cache_array']['config'][$data['config']][$k] = $v;
 173                                 } elseif ($this->name == 'filter') {
 174                                         // Filter
 175                                         $GLOBALS['cache_array']['filter']['chains'][$data['filter_name']][$data['filter_function']] = $data['filter_active'];
 176                                         $GLOBALS['cache_array']['filter']['counter'][$data['filter_name']][$data['filter_function']] = $data['filter_counter'];
 177                                         $GLOBALS['cache_array']['filter']['loaded'][$data['filter_name']][$data['filter_function']] = true;
 178                                 } elseif ($this->name == 'modules') {
 179                                         // Modules
 180                                         $GLOBALS['cache_array']['modules'][$k][$data['module']] = $v;
 181                                 } elseif ($this->name == 'admin') {
 182                                         // Admin logins
 183                                         if ($k == 'admin_id') {
 184                                                 $GLOBALS['cache_array']['admin'][$k][$data['login']] = $v;
 185                                         } else {
 186                                                 $GLOBALS['cache_array']['admin'][$k][$data['admin_id']] = $v;
 187                                         }
 188                                 } elseif ($this->name == 'refdepths') {
 189                                         // Referal levels
 190                                         $GLOBALS['cache_array']['refdepths'][$k][$data['id']] = $v;
 191                                 } elseif ($this->name == 'refsystem') {
 192                                         // Referal system
 193                                         $GLOBALS['cache_array']['refsystem'][$k][$data['id']] = $v;
 194                                 } elseif ($this->name == 'revision') {
 195                                         // Revision data
 196                                         $GLOBALS['cache_array']['revision'][$k][0] = $v;
 197                                 } elseif ($this->name == 'themes') {
 198                                         // Themes
 199                                         if ($k == 'theme_path') {
 200                                                 $GLOBALS['cache_array']['themes'][$k][$data['id']] = $v;
 201                                         } else {
 202                                                 $GLOBALS['cache_array']['themes'][$k][$data['theme_path']] = $v;
 203                                         }
 204                                 } elseif ($this->name == 'imprint') {
 205                                         // Imprint
 206                                         $GLOBALS['cache_array']['imprint'][$k][$data['imprint_id']] = $v;
 207                                 } elseif (is_array($v)) {
 208                                         // Serialize and BASE64-encode the array
 209                                         $v = base64_encode(serialize($v));
 210                                 } else {
 211                                         // Finialize the cache and close it
 212                                         $this->finalize();
 213
 214                                         // Remove cache
 215                                         $this->removeCacheFile(true);
 216
 217                                         // Unsupported/unhandled cache detected
 218                                         debug_report_bug(__METHOD__, __LINE__, 'Unsupported cache ' . $this->name . ' detected.');
 219                                 }
 220
 221                                 // Write cache line to file
 222                                 $this->writeLine($this->rewriteEntry($k, $v));
 223                         } // END - foreach
 224                 } else {
 225                         // Cannot create file
 226                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 227                 }
 228         }
 229
 230         function finalize () {
 231                 // Quit function when no pointer is set
 232                 if (is_resource($this->pointer)) {
 233                         // Add default depency
 234                         $this->storeExtensionVersion('cache');
 235
 236                         // Write footer
 237                         $this->writeLine('?>');
 238
 239                         // Close file add destroy handler
 240                         fclose($this->pointer);
 241
 242                         // Reset readable status
 243                         $this->resetCacheReadStatus();
 244
 245                         // Set rights
 246                         if ($this->isCacheReadable()) changeMode($this->fqfn, 0666);
 247
 248                         // Remove pointer and status
 249                         unset($this->status[$this->name]);
 250                         $this->pointer = false;
 251                         //* DEBUG: */ debugOutput(__METHOD__ . '(<font color="#0000aa">' . __LINE__.'</font>): '.$this->name.' - FINALIZED!');
 252                 } // END - if
 253         }
 254
 255         function getArrayFromCache () {
 256                 // Is the cache already loaded?
 257                 if (isset($this->data[$this->name])) {
 258                         // Return it's content!
 259                         return $this->data[$this->name];
 260                 } // END - if
 261
 262                 // Is the cache file there?
 263                 if ($this->isCacheReadable()) {
 264                         // Load cache file
 265                         include($this->fqfn);
 266
 267                         // Is there an array?
 268                         if (isset($this->data[$this->name])) {
 269                                 // Cache version found?
 270                                 if (isset($this->version[$this->name])) {
 271                                         // Check it here if cache matches ext-cache version
 272                                         if (!$this->extensionVersionMatches('cache')) {
 273                                                 // Invalid
 274                                                 logDebugMessage(__METHOD__, __LINE__, 'Invalid cache data ' . $this->name . ' detected.');
 275                                                 $this->removeCacheFile();
 276                                         } // END - if
 277                                 } // END - if
 278
 279                                 // Return cache if detected
 280                                 if (isset($this->data[$this->name])) {
 281                                         return $this->data[$this->name];
 282                                 } else {
 283                                         // Damaged!
 284                                         logDebugMessage(__METHOD__, __LINE__, 'Possible damaged cache ' . $this->name . ' detected.');
 285                                         $this->removeCacheFile();
 286                                 }
 287                         } // END - if
 288                 } else {
 289                         // Cache file not found or not readable
 290                         debug_report_bug(__METHOD__, __LINE__, $this->name);
 291                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): ' . getMaskedMessage('CACHE_CANNOT_LOAD', $this->fqfn));
 292
 293                         // Try to remove it
 294                         $this->removeCacheFile();
 295                 }
 296
 297                 // Always return an empty array if we have trouble or no data
 298                 return array();
 299         }
 300
 301         // Destroy an existing cache file
 302         function removeCacheFile ($force = false) {
 303                 // Reset read status
 304                 $this->resetCacheReadStatus();
 305
 306                 // Debug message
 307                 //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, sprintf("%s should be removed.", $this->name));
 308
 309                 // Is the cache file not yet rebuilt?
 310                 if ((!isset($this->rebuilt[$this->name])) && ($this->isCacheReadable())) {
 311                         // Only run in regular output mode
 312                         if ((!isHtmlOutputMode()) && ($force === false)) {
 313                                 // Debug message if allowed
 314                                 if (isDebugModeEnabled()) {
 315                                         // Debug message
 316                                         logDebugMessage(__METHOD__, __LINE__, 'Not removing cache ' . $this->name . ' in output_mode=' . getScriptOutputMode());
 317                                 } // END - if
 318
 319                                 // Abort here
 320                                 return;
 321                         } // END - if
 322
 323                         // Close cache
 324                         $this->finalize();
 325
 326                         // Debug-mode enabled?
 327                         if (isDebugModeEnabled()) {
 328                                 // Log removal of cache
 329                                 logDebugMessage(__METHOD__, __LINE__, 'removing cache: ' . $this->name);
 330                         } // END - if
 331
 332                         // Remove cache file from system
 333                         removeFile($this->fqfn);
 334
 335                         // Reset read status
 336                         $this->resetCacheReadStatus();
 337
 338                         // Is the file there?
 339                         if (!$this->isCacheReadable()) {
 340                                 // The cache does no longer exist so kill the content
 341                                 unset($this->data[$this->name]);
 342                                 unset($this->version[$this->name]);
 343                                 $this->rebuilt[$this->name] = true;
 344                         } else {
 345                                 // Not removed!
 346                                 addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): ' . getMaskedMessage('CACHE_CANNOT_UNLINK', $this->fqfn));
 347                         }
 348                 } // END - if
 349         }
 350
 351         // Unused method:
 352         function removeEntry ($search, $data, $array) {
 353                 if ($this->status[$this->name] == 'done') {
 354                         // Load cache into dummy array
 355                         $dummy = $this->getArrayFromCache();
 356
 357                         // Search for key in array
 358                         $key = array_search($data, $dummy[$search]);
 359                         if (!empty($key)) {
 360                                 // Key (hopefully) found?
 361                                 foreach ($array as $a) {
 362                                         // So we can remove all elements as requested
 363                                         unset($dummy[$a][$key]);
 364                                 } // END - foreach
 365
 366                                 // Flush array to cache file
 367                                 $this->init();
 368
 369                                 // Write array out
 370                                 $this->writeArray($dummy);
 371
 372                                 // Close cache file
 373                                 $this->finalize();
 374                         }
 375                 } else {
 376                         // Cannot write to cache!
 377                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 378                 }
 379         }
 380
 381         function writeArray ($array) {
 382                 if (is_resource($this->pointer)) {
 383                         foreach ($array as $k => $v) {
 384                                 if (is_array($v)) {
 385                                         // Multi line(s) found
 386                                         $LINE = '';
 387                                         foreach ($v as $k2 => $v2) {
 388                                                 // Put every array element in a row...
 389                                                 $LINE .= $this->rewriteEntry($k, $v2);
 390                                         } // END - foreach
 391                                 } else {
 392                                         // Single line found
 393                                         $LINE = $this->rewriteEntry($k, $v);
 394                                 }
 395
 396                                 // Write line(s)
 397                                 $this->writeLine($LINE);
 398                         } // END - foreach
 399                 } else {
 400                         // Cannot write array!
 401                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 402                 }
 403         }
 404
 405         // Unused method
 406         function replaceEntry ($search, $replace, $search_key, $array) {
 407                 if ($this->status[$this->name] == 'done') {
 408                         // Load cache into dummy array
 409                         $dummy = $this->getArrayFromCache();
 410
 411                         // Check if $dummy is valid (prevents some errors)
 412                         if ((is_array($dummy)) && (isset($dummy[$search])) && (is_array($dummy[$search]))) {
 413                                 // Search for key in array
 414                                 $key_found = array_key_exists($search_key, $dummy[$search]);
 415                                 if ($key_found == true) {
 416                                         $key = $search_key;
 417                                         // Key (hopefully) found?
 418                                         foreach ($dummy as $a => $v) {
 419                                                 // So we can update all entries
 420                                                 if ($a == $search) {
 421                                                         // Update now...
 422                                                         $dummy[$a][$search_key] = $replace;
 423                                                 } // END - if
 424                                         } // END - foreach
 425
 426                                         // Flush array to cache file
 427                                         $this->init();
 428
 429                                         // Write array out
 430                                         $this->writeArray($dummy);
 431
 432                                         // Close cache file
 433                                         $this->finalize();
 434                                 } // END - if
 435                         } // END - if
 436                 } else {
 437                         // Cannot write to cache!
 438                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 439                 }
 440         }
 441
 442         // Writes the version of given extension to the cache file
 443         function storeExtensionVersion ($ext_name) {
 444                 // Valid cache pointer?
 445                 if (is_resource($this->pointer)) {
 446                         // Write only if extension is installed
 447                         if (isExtensionInstalled($ext_name)) {
 448                                 // Get extension version
 449                                 $ext_ver = getExtensionVersion($ext_name);
 450
 451                                 // Add the extension version to object (DO NOT REMOVE IT! Endless loop...)
 452                                 $this->version[$this->name][$ext_name] = $ext_ver;
 453
 454                                 // Write cache line to file
 455                                 $this->writeLine($this->rewriteEntry($ext_name, $ext_ver, 'version', true));
 456                         } // END - if
 457                         //* DEBUG: */ debugOutput(__METHOD__ . '(<font color="#0000aa">' . __LINE__ . '</font>): '.$this->name.' - '.$ext_name.'='.$ext_ver);
 458                 } else {
 459                         // Cannot create file
 460                         addFatalMessage(__METHOD__, __LINE__, '(<font color="#0000aa">' . __LINE__ . '</font>): {--CACHE_PROBLEMS_DETECTED');
 461                 }
 462         }
 463
 464         // Checks wether versions from cache and extension matches
 465         function extensionVersionMatches ($ext_name) {
 466                 // Check cache
 467                 if (!isset($GLOBALS[__METHOD__][$ext_name])) {
 468                         // Does never match by default
 469                         $GLOBALS[__METHOD__][$ext_name] = false;
 470
 471                         // Compare only if installed
 472                         if (isExtensionInstalled($ext_name)) {
 473                                 // Get extension version
 474                                 $ext_ver = getExtensionVersion($ext_name);
 475
 476                                 // Debug messages
 477                                 if (isset($this->version[$this->name][$ext_name])) {
 478                                         // Does it match?
 479                                         $GLOBALS[__METHOD__][$ext_name] = ((isset($this->version[$this->name][$ext_name])) && ($this->version[$this->name][$ext_name] == $ext_ver));
 480                                 } elseif ($this->isCacheReadable()) {
 481                                         // No cache version found
 482                                         logDebugMessage(__METHOD__, __LINE__, 'Cache ' . $this->name . ' has missing version entry for extension ' . $ext_name . '! Purging cache...');
 483
 484                                         // Remove the cache file
 485                                         $this->removeCacheFile(true);
 486                                 }
 487                         } else {
 488                                 // Not installed, does always match
 489                                 $GLOBALS[__METHOD__][$ext_name] = true;
 490                         }
 491                 } else {
 492                         // Cache entry found, log debug message
 493                         //* DEBUG: */ logDebugMessage(__METHOD__, __LINE__, 'ext_name=' . $ext_name . ', matches=' . intval($GLOBALS[__METHOD__][$ext_name]));
 494                 }
 495
 496                 // Compare both
 497                 return $GLOBALS[__METHOD__][$ext_name];
 498         }
 499
 500         // Rewrit the entry so it can be stored in cache file
 501         // @TODO Add support for more types which break in last else-block
 502         function rewriteEntry ($key, $value, $prefix = 'data', $single = false) {
 503                 // Default is not single entry
 504                 $extender = '[]';
 505
 506                 // Add only for single array entry?
 507                 if ($single === true) {
 508                         $extender = '';
 509                 } // END - if
 510
 511                 // Init line
 512                 $line = '';
 513
 514                 // String or non-string? ;-)
 515                 if (is_string($value)) {
 516                         // String...
 517                         $line = '$this->' . $prefix . "['" . $this->name . "']['" . $key . "']" . $extender . " = '" . escapeQuotes($value) . "';";
 518                 } elseif (is_null($value)) {
 519                         // Null
 520                         $line = '$this->' . $prefix . "['" . $this->name . "']['" . $key . "']" . $extender . ' = null;';
 521                 } elseif (is_bool($value)) {
 522                         // Boolean value
 523                         if ($value === true) {
 524                                 // True
 525                                 $line = '$this->' . $prefix . "['" . $this->name . "']['" . $key . "']" . $extender . ' = true;';
 526                         } else {
 527                                 // False
 528                                 $line = '$this->' . $prefix . "['" . $this->name . "']['" . $key . "']" . $extender . ' = false;';
 529                         }
 530                 } elseif (isset($value[0])) {
 531                         // These lines needs fixing
 532                         debug_report_bug(__METHOD__, __LINE__, 'Invalid entry with [0] found. key=' . $key);
 533                 } else {
 534                         // Non-string
 535                         $line = '$this->' . $prefix . "['" . $this->name . "']['" . $key . "']" . $extender . ' = ' . $value . ';';
 536                 }
 537
 538                 // Return line
 539                 return $line;
 540         }
 541
 542         // Getter for cache status code
 543         function getStatusCode () {
 544                 return $this->statusCode;
 545         }
 546
 547         // Setter for cache status code
 548         function setStatusCode ($status) {
 549                 $this->statusCode = $status;
 550         }
 551
 552         // Checks wether the current cache file is readable
 553         function isCacheReadable () {
 554                 // Array entry found?
 555                 if (!isset($this->readable[$this->name])) {
 556                         // Not found, so create it
 557                         $this->readable[$this->name] = isFileReadable($this->fqfn);
 558                 } // END - if
 559
 560                 // Return result
 561                 return $this->readable[$this->name];
 562         }
 563
 564         // Cloning not allowed
 565         function __clone () {
 566                 // Please do not clone this class
 567                 debug_report_bug(__METHOD__, __LINE__, 'Cloning of this class is not allowed.');
 568         }
 569 } // END - class
 570
 571 // [EOF]
 572 ?>