[b354002] | 1 | <?php |
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| 2 | |
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| 3 | /** |
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| 4 | * @file |
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| 5 | * API for loading and interacting with Drupal modules. |
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| 6 | */ |
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| 7 | |
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| 8 | /** |
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| 9 | * Load all the modules that have been enabled in the system table. |
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| 10 | */ |
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| 11 | function module_load_all() { |
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| 12 | foreach (module_list(TRUE, FALSE) as $module) { |
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| 13 | drupal_load('module', $module); |
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| 14 | } |
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| 15 | } |
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| 16 | |
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| 17 | /** |
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| 18 | * Call a function repeatedly with each module in turn as an argument. |
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| 19 | */ |
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| 20 | function module_iterate($function, $argument = '') { |
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| 21 | foreach (module_list() as $name) { |
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| 22 | $function($name, $argument); |
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| 23 | } |
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| 24 | } |
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| 25 | |
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| 26 | /** |
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| 27 | * Collect a list of all loaded modules. During the bootstrap, return only |
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| 28 | * vital modules. See bootstrap.inc |
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| 29 | * |
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| 30 | * @param $refresh |
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| 31 | * Whether to force the module list to be regenerated (such as after the |
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| 32 | * administrator has changed the system settings). |
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| 33 | * @param $bootstrap |
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| 34 | * Whether to return the reduced set of modules loaded in "bootstrap mode" |
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| 35 | * for cached pages. See bootstrap.inc. |
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| 36 | * @param $sort |
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| 37 | * By default, modules are ordered by weight and filename, settings this option |
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| 38 | * to TRUE, module list will be ordered by module name. |
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| 39 | * @param $fixed_list |
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| 40 | * (Optional) Override the module list with the given modules. Stays until the |
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| 41 | * next call with $refresh = TRUE. |
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| 42 | * @return |
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| 43 | * An associative array whose keys and values are the names of all loaded |
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| 44 | * modules. |
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| 45 | */ |
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| 46 | function module_list($refresh = FALSE, $bootstrap = TRUE, $sort = FALSE, $fixed_list = NULL) { |
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| 47 | static $list, $sorted_list; |
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| 48 | |
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| 49 | if ($refresh || $fixed_list) { |
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| 50 | $list = array(); |
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| 51 | $sorted_list = NULL; |
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| 52 | if ($fixed_list) { |
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| 53 | foreach ($fixed_list as $name => $module) { |
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| 54 | drupal_get_filename('module', $name, $module['filename']); |
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| 55 | $list[$name] = $name; |
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| 56 | } |
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| 57 | } |
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| 58 | else { |
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| 59 | if ($bootstrap) { |
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| 60 | $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC"); |
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| 61 | } |
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| 62 | else { |
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| 63 | $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC"); |
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| 64 | } |
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| 65 | while ($module = db_fetch_object($result)) { |
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| 66 | if (file_exists($module->filename)) { |
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| 67 | // Determine the current throttle status and see if the module should be |
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| 68 | // loaded based on server load. We have to directly access the throttle |
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| 69 | // variables, since throttle.module may not be loaded yet. |
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| 70 | $throttle = ($module->throttle && variable_get('throttle_level', 0) > 0); |
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| 71 | if (!$throttle) { |
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| 72 | drupal_get_filename('module', $module->name, $module->filename); |
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| 73 | $list[$module->name] = $module->name; |
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| 74 | } |
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| 75 | } |
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| 76 | } |
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| 77 | } |
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| 78 | } |
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| 79 | if ($sort) { |
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| 80 | if (!isset($sorted_list)) { |
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| 81 | $sorted_list = $list; |
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| 82 | ksort($sorted_list); |
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| 83 | } |
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| 84 | return $sorted_list; |
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| 85 | } |
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| 86 | return $list; |
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| 87 | } |
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| 88 | |
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| 89 | /** |
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| 90 | * Rebuild the database cache of module files. |
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| 91 | * |
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| 92 | * @return |
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| 93 | * The array of filesystem objects used to rebuild the cache. |
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| 94 | */ |
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| 95 | function module_rebuild_cache() { |
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[d7a822e] | 96 | $write_database = TRUE; |
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| 97 | // If lock not acquired, return $files data without writing to database. |
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| 98 | if (!lock_acquire('module_rebuild_cache')) { |
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| 99 | $write_database = FALSE; |
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| 100 | // Wait for the parallel thread to be done so we are more likely |
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| 101 | // to get updated and consistent data. |
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| 102 | lock_wait('module_rebuild_cache'); |
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| 103 | } |
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[b354002] | 104 | // Get current list of modules |
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| 105 | $files = drupal_system_listing('\.module$', 'modules', 'name', 0); |
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| 106 | |
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| 107 | // Extract current files from database. |
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| 108 | system_get_files_database($files, 'module'); |
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| 109 | |
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| 110 | ksort($files); |
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| 111 | |
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| 112 | // Set defaults for module info |
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| 113 | $defaults = array( |
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| 114 | 'dependencies' => array(), |
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| 115 | 'dependents' => array(), |
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| 116 | 'description' => '', |
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| 117 | 'version' => NULL, |
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| 118 | 'php' => DRUPAL_MINIMUM_PHP, |
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| 119 | ); |
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| 120 | |
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| 121 | foreach ($files as $filename => $file) { |
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| 122 | // Look for the info file. |
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| 123 | $file->info = drupal_parse_info_file(dirname($file->filename) .'/'. $file->name .'.info'); |
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| 124 | |
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| 125 | // Skip modules that don't provide info. |
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| 126 | if (empty($file->info)) { |
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| 127 | unset($files[$filename]); |
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| 128 | continue; |
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| 129 | } |
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| 130 | |
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| 131 | // Invoke hook_system_info_alter() to give installed modules a chance to |
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| 132 | // modify the data in the .info files if necessary. |
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| 133 | drupal_alter('system_info', $files[$filename]->info, $files[$filename]); |
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| 134 | |
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[d7a822e] | 135 | // Merge in defaults and save. |
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| 136 | $files[$filename]->info = $file->info + $defaults; |
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| 137 | } |
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| 138 | |
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| 139 | // If lock not acquired, return $files data without writing to database. |
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| 140 | if ($write_database) { |
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| 141 | foreach ($files as $filename => $file) { |
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| 142 | // Log the critical hooks implemented by this module. |
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| 143 | $bootstrap = 0; |
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| 144 | foreach (bootstrap_hooks() as $hook) { |
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| 145 | if (module_hook($file->name, $hook)) { |
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| 146 | $bootstrap = 1; |
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| 147 | break; |
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| 148 | } |
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[b354002] | 149 | } |
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| 150 | |
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[d7a822e] | 151 | // Update the contents of the system table: |
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| 152 | if (isset($file->status)) { |
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| 153 | db_query("UPDATE {system} SET info = '%s', name = '%s', filename = '%s', bootstrap = %d WHERE filename = '%s'", serialize($files[$filename]->info), $file->name, $file->filename, $bootstrap, $file->old_filename); |
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| 154 | } |
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| 155 | else { |
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| 156 | // This is a new module. |
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| 157 | $files[$filename]->status = 0; |
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| 158 | $files[$filename]->throttle = 0; |
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| 159 | db_query("INSERT INTO {system} (name, info, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $file->name, serialize($files[$filename]->info), 'module', $file->filename, 0, 0, $bootstrap); |
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| 160 | } |
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[b354002] | 161 | } |
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[d7a822e] | 162 | lock_release('module_rebuild_cache'); |
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[b354002] | 163 | } |
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| 164 | $files = _module_build_dependencies($files); |
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| 165 | return $files; |
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| 166 | } |
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| 167 | |
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| 168 | /** |
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| 169 | * Find dependencies any level deep and fill in dependents information too. |
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| 170 | * |
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| 171 | * If module A depends on B which in turn depends on C then this function will |
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| 172 | * add C to the list of modules A depends on. This will be repeated until |
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| 173 | * module A has a list of all modules it depends on. If it depends on itself, |
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| 174 | * called a circular dependency, that's marked by adding a nonexistent module, |
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| 175 | * called -circular- to this list of modules. Because this does not exist, |
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| 176 | * it'll be impossible to switch module A on. |
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| 177 | * |
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| 178 | * Also we fill in a dependents array in $file->info. Using the names above, |
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| 179 | * the dependents array of module B lists A. |
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| 180 | * |
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| 181 | * @param $files |
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| 182 | * The array of filesystem objects used to rebuild the cache. |
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| 183 | * @return |
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| 184 | * The same array with dependencies and dependents added where applicable. |
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| 185 | */ |
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| 186 | function _module_build_dependencies($files) { |
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| 187 | do { |
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| 188 | $new_dependency = FALSE; |
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| 189 | foreach ($files as $filename => $file) { |
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| 190 | // We will modify this object (module A, see doxygen for module A, B, C). |
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| 191 | $file = &$files[$filename]; |
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| 192 | if (isset($file->info['dependencies']) && is_array($file->info['dependencies'])) { |
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| 193 | foreach ($file->info['dependencies'] as $dependency_name) { |
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| 194 | // This is a nonexistent module. |
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| 195 | if ($dependency_name == '-circular-' || !isset($files[$dependency_name])) { |
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| 196 | continue; |
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| 197 | } |
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| 198 | // $dependency_name is module B (again, see doxygen). |
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| 199 | $files[$dependency_name]->info['dependents'][$filename] = $filename; |
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| 200 | $dependency = $files[$dependency_name]; |
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| 201 | if (isset($dependency->info['dependencies']) && is_array($dependency->info['dependencies'])) { |
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| 202 | // Let's find possible C modules. |
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| 203 | foreach ($dependency->info['dependencies'] as $candidate) { |
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| 204 | if (array_search($candidate, $file->info['dependencies']) === FALSE) { |
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| 205 | // Is this a circular dependency? |
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| 206 | if ($candidate == $filename) { |
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| 207 | // As a module name can not contain dashes, this makes |
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| 208 | // impossible to switch on the module. |
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| 209 | $candidate = '-circular-'; |
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| 210 | // Do not display the message or add -circular- more than once. |
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| 211 | if (array_search($candidate, $file->info['dependencies']) !== FALSE) { |
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| 212 | continue; |
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| 213 | } |
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| 214 | drupal_set_message(t('%module is part of a circular dependency. This is not supported and you will not be able to switch it on.', array('%module' => $file->info['name'])), 'error'); |
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| 215 | } |
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| 216 | else { |
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| 217 | // We added a new dependency to module A. The next loop will |
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| 218 | // be able to use this as "B module" thus finding even |
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| 219 | // deeper dependencies. |
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| 220 | $new_dependency = TRUE; |
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| 221 | } |
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| 222 | $file->info['dependencies'][] = $candidate; |
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| 223 | } |
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| 224 | } |
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| 225 | } |
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| 226 | } |
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| 227 | } |
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| 228 | // Don't forget to break the reference. |
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| 229 | unset($file); |
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| 230 | } |
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| 231 | } while ($new_dependency); |
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| 232 | return $files; |
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| 233 | } |
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| 234 | |
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| 235 | /** |
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| 236 | * Determine whether a given module exists. |
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| 237 | * |
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| 238 | * @param $module |
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| 239 | * The name of the module (without the .module extension). |
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| 240 | * @return |
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| 241 | * TRUE if the module is both installed and enabled. |
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| 242 | */ |
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| 243 | function module_exists($module) { |
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| 244 | $list = module_list(); |
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| 245 | return array_key_exists($module, $list); |
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| 246 | } |
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| 247 | |
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| 248 | /** |
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| 249 | * Load a module's installation hooks. |
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| 250 | */ |
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| 251 | function module_load_install($module) { |
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| 252 | // Make sure the installation API is available |
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| 253 | include_once './includes/install.inc'; |
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| 254 | |
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| 255 | module_load_include('install', $module); |
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| 256 | } |
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| 257 | |
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| 258 | /** |
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| 259 | * Load a module include file. |
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| 260 | * |
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| 261 | * Examples: |
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| 262 | * @code |
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| 263 | * // Load node.admin.inc from the node module. |
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| 264 | * module_load_include('inc', 'node', 'node.admin'); |
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| 265 | * // Load content_types.inc from the node module. |
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| 266 | * module_load_include('inc', 'node', 'content_types'); |
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| 267 | * @endcode |
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| 268 | * |
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| 269 | * Do not use this function to load an install file. Use module_load_install() |
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| 270 | * instead. |
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| 271 | * |
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| 272 | * @param $type |
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| 273 | * The include file's type (file extension). |
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| 274 | * @param $module |
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| 275 | * The module to which the include file belongs. |
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| 276 | * @param $name |
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| 277 | * Optionally, specify the base file name (without the $type extension). |
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| 278 | * If not set, $module is used. |
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| 279 | */ |
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| 280 | function module_load_include($type, $module, $name = NULL) { |
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| 281 | if (empty($name)) { |
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| 282 | $name = $module; |
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| 283 | } |
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| 284 | |
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| 285 | $file = './'. drupal_get_path('module', $module) ."/$name.$type"; |
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| 286 | |
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| 287 | if (is_file($file)) { |
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| 288 | require_once $file; |
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| 289 | } |
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| 290 | else { |
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| 291 | return FALSE; |
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| 292 | } |
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| 293 | } |
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| 294 | |
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| 295 | /** |
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| 296 | * Load an include file for each of the modules that have been enabled in |
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| 297 | * the system table. |
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| 298 | */ |
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| 299 | function module_load_all_includes($type, $name = NULL) { |
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| 300 | $modules = module_list(); |
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| 301 | foreach ($modules as $module) { |
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| 302 | module_load_include($type, $module, $name); |
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| 303 | } |
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| 304 | } |
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| 305 | |
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| 306 | /** |
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| 307 | * Enable a given list of modules. |
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| 308 | * |
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| 309 | * @param $module_list |
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| 310 | * An array of module names. |
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| 311 | */ |
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| 312 | function module_enable($module_list) { |
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| 313 | $invoke_modules = array(); |
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| 314 | foreach ($module_list as $module) { |
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| 315 | $existing = db_fetch_object(db_query("SELECT status FROM {system} WHERE type = '%s' AND name = '%s'", 'module', $module)); |
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| 316 | if ($existing->status == 0) { |
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| 317 | module_load_install($module); |
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| 318 | db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 1, 0, 'module', $module); |
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| 319 | drupal_load('module', $module); |
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| 320 | $invoke_modules[] = $module; |
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| 321 | } |
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| 322 | } |
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| 323 | |
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| 324 | if (!empty($invoke_modules)) { |
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| 325 | // Refresh the module list to include the new enabled module. |
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| 326 | module_list(TRUE, FALSE); |
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| 327 | // Force to regenerate the stored list of hook implementations. |
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| 328 | module_implements('', FALSE, TRUE); |
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| 329 | } |
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| 330 | |
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| 331 | foreach ($invoke_modules as $module) { |
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| 332 | module_invoke($module, 'enable'); |
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| 333 | // Check if node_access table needs rebuilding. |
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| 334 | // We check for the existence of node_access_needs_rebuild() since |
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| 335 | // at install time, module_enable() could be called while node.module |
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| 336 | // is not enabled yet. |
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| 337 | if (function_exists('node_access_needs_rebuild') && !node_access_needs_rebuild() && module_hook($module, 'node_grants')) { |
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| 338 | node_access_needs_rebuild(TRUE); |
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| 339 | } |
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| 340 | } |
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| 341 | } |
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| 342 | |
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| 343 | /** |
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| 344 | * Disable a given set of modules. |
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| 345 | * |
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| 346 | * @param $module_list |
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| 347 | * An array of module names. |
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| 348 | */ |
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| 349 | function module_disable($module_list) { |
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| 350 | $invoke_modules = array(); |
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| 351 | foreach ($module_list as $module) { |
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| 352 | if (module_exists($module)) { |
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| 353 | // Check if node_access table needs rebuilding. |
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| 354 | if (!node_access_needs_rebuild() && module_hook($module, 'node_grants')) { |
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| 355 | node_access_needs_rebuild(TRUE); |
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| 356 | } |
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| 357 | |
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| 358 | module_load_install($module); |
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| 359 | module_invoke($module, 'disable'); |
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| 360 | db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 0, 0, 'module', $module); |
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| 361 | $invoke_modules[] = $module; |
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| 362 | } |
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| 363 | } |
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| 364 | |
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| 365 | if (!empty($invoke_modules)) { |
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| 366 | // Refresh the module list to exclude the disabled modules. |
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| 367 | module_list(TRUE, FALSE); |
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| 368 | // Force to regenerate the stored list of hook implementations. |
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| 369 | module_implements('', FALSE, TRUE); |
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| 370 | } |
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| 371 | |
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| 372 | // If there remains no more node_access module, rebuilding will be |
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| 373 | // straightforward, we can do it right now. |
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| 374 | if (node_access_needs_rebuild() && count(module_implements('node_grants')) == 0) { |
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| 375 | node_access_rebuild(); |
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| 376 | } |
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| 377 | } |
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| 378 | |
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| 379 | /** |
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| 380 | * @defgroup hooks Hooks |
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| 381 | * @{ |
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| 382 | * Allow modules to interact with the Drupal core. |
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| 383 | * |
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| 384 | * Drupal's module system is based on the concept of "hooks". A hook is a PHP |
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| 385 | * function that is named foo_bar(), where "foo" is the name of the module |
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| 386 | * (whose filename is thus foo.module) and "bar" is the name of the hook. Each |
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| 387 | * hook has a defined set of parameters and a specified result type. |
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| 388 | * |
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| 389 | * To extend Drupal, a module need simply implement a hook. When Drupal wishes |
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| 390 | * to allow intervention from modules, it determines which modules implement a |
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| 391 | * hook and calls that hook in all enabled modules that implement it. |
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| 392 | * |
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| 393 | * The available hooks to implement are explained here in the Hooks section of |
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| 394 | * the developer documentation. The string "hook" is used as a placeholder for |
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| 395 | * the module name in the hook definitions. For example, if the module file is |
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| 396 | * called example.module, then hook_help() as implemented by that module would |
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| 397 | * be defined as example_help(). |
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| 398 | */ |
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| 399 | |
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| 400 | /** |
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| 401 | * Determine whether a module implements a hook. |
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| 402 | * |
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| 403 | * @param $module |
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| 404 | * The name of the module (without the .module extension). |
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| 405 | * @param $hook |
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| 406 | * The name of the hook (e.g. "help" or "menu"). |
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| 407 | * @return |
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| 408 | * TRUE if the module is both installed and enabled, and the hook is |
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| 409 | * implemented in that module. |
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| 410 | */ |
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| 411 | function module_hook($module, $hook) { |
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| 412 | return function_exists($module .'_'. $hook); |
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| 413 | } |
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| 414 | |
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| 415 | /** |
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| 416 | * Determine which modules are implementing a hook. |
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| 417 | * |
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| 418 | * @param $hook |
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| 419 | * The name of the hook (e.g. "help" or "menu"). |
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| 420 | * @param $sort |
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| 421 | * By default, modules are ordered by weight and filename, settings this option |
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| 422 | * to TRUE, module list will be ordered by module name. |
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| 423 | * @param $refresh |
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| 424 | * For internal use only: Whether to force the stored list of hook |
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| 425 | * implementations to be regenerated (such as after enabling a new module, |
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| 426 | * before processing hook_enable). |
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| 427 | * @return |
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| 428 | * An array with the names of the modules which are implementing this hook. |
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| 429 | */ |
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| 430 | function module_implements($hook, $sort = FALSE, $refresh = FALSE) { |
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| 431 | static $implementations; |
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| 432 | |
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| 433 | if ($refresh) { |
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| 434 | $implementations = array(); |
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| 435 | return; |
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| 436 | } |
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| 437 | |
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| 438 | if (!isset($implementations[$hook])) { |
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| 439 | $implementations[$hook] = array(); |
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| 440 | $list = module_list(FALSE, TRUE, $sort); |
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| 441 | foreach ($list as $module) { |
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| 442 | if (module_hook($module, $hook)) { |
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| 443 | $implementations[$hook][] = $module; |
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| 444 | } |
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| 445 | } |
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| 446 | } |
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| 447 | |
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| 448 | // The explicit cast forces a copy to be made. This is needed because |
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| 449 | // $implementations[$hook] is only a reference to an element of |
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| 450 | // $implementations and if there are nested foreaches (due to nested node |
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| 451 | // API calls, for example), they would both manipulate the same array's |
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| 452 | // references, which causes some modules' hooks not to be called. |
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| 453 | // See also http://www.zend.com/zend/art/ref-count.php. |
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| 454 | return (array)$implementations[$hook]; |
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| 455 | } |
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| 456 | |
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| 457 | /** |
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| 458 | * Invoke a hook in a particular module. |
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| 459 | * |
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| 460 | * @param $module |
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| 461 | * The name of the module (without the .module extension). |
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| 462 | * @param $hook |
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| 463 | * The name of the hook to invoke. |
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| 464 | * @param ... |
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| 465 | * Arguments to pass to the hook implementation. |
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| 466 | * @return |
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| 467 | * The return value of the hook implementation. |
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| 468 | */ |
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| 469 | function module_invoke() { |
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| 470 | $args = func_get_args(); |
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| 471 | $module = $args[0]; |
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| 472 | $hook = $args[1]; |
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| 473 | unset($args[0], $args[1]); |
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| 474 | $function = $module .'_'. $hook; |
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| 475 | if (module_hook($module, $hook)) { |
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| 476 | return call_user_func_array($function, $args); |
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| 477 | } |
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| 478 | } |
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| 479 | /** |
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| 480 | * Invoke a hook in all enabled modules that implement it. |
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| 481 | * |
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| 482 | * @param $hook |
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| 483 | * The name of the hook to invoke. |
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| 484 | * @param ... |
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| 485 | * Arguments to pass to the hook. |
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| 486 | * @return |
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| 487 | * An array of return values of the hook implementations. If modules return |
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| 488 | * arrays from their implementations, those are merged into one array. |
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| 489 | */ |
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| 490 | function module_invoke_all() { |
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| 491 | $args = func_get_args(); |
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| 492 | $hook = $args[0]; |
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| 493 | unset($args[0]); |
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| 494 | $return = array(); |
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| 495 | foreach (module_implements($hook) as $module) { |
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| 496 | $function = $module .'_'. $hook; |
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| 497 | $result = call_user_func_array($function, $args); |
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| 498 | if (isset($result) && is_array($result)) { |
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| 499 | $return = array_merge_recursive($return, $result); |
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| 500 | } |
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| 501 | else if (isset($result)) { |
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| 502 | $return[] = $result; |
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| 503 | } |
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| 504 | } |
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| 505 | |
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| 506 | return $return; |
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| 507 | } |
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| 508 | |
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| 509 | /** |
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| 510 | * @} End of "defgroup hooks". |
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| 511 | */ |
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| 512 | |
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| 513 | /** |
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| 514 | * Array of modules required by core. |
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| 515 | */ |
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| 516 | function drupal_required_modules() { |
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| 517 | return array('block', 'filter', 'node', 'system', 'user'); |
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| 518 | } |
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