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<?php
/**
* @file
* This file contains the code registry parser engine.
*/
/**
* @defgroup registry Code registry
* @{
* The code registry engine.
*
* Drupal maintains an internal registry of all functions or classes in the
* system, allowing it to lazy-load code files as needed (reducing the amount
* of code that must be parsed on each request).
*/
/**
* Does the work for registry_update().
*/
function _registry_update() {
// The registry serves as a central autoloader for all classes, including
// the database query builders. However, the registry rebuild process
// requires write ability to the database, which means having access to the
// query builders that require the registry in order to be loaded. That
// causes a fatal race condition. Therefore we manually include the
// appropriate query builders for the currently active database before the
// registry rebuild process runs.
$connection_info = Database::getConnectionInfo();
$driver = $connection_info['default']['driver'];
require_once DRUPAL_ROOT . '/includes/database/query.inc';
require_once DRUPAL_ROOT . '/includes/database/select.inc';
require_once DRUPAL_ROOT . '/includes/database/' . $driver . '/query.inc';
// Get current list of modules and their files.
$modules = db_query("SELECT * FROM {system} WHERE type = 'module'")->fetchAll();
// Get the list of files we are going to parse.
$files = array();
foreach ($modules as &$module) {
$module->info = unserialize($module->info);
$dir = dirname($module->filename);
// Store the module directory for use in hook_registry_files_alter().
$module->dir = $dir;
if ($module->status) {
// Add files for enabled modules to the registry.
foreach ($module->info['files'] as $file) {
$files["$dir/$file"] = array('module' => $module->name, 'weight' => $module->weight);
}
}
}
foreach (file_scan_directory('includes', '/\.inc$/') as $filename => $file) {
$files["$filename"] = array('module' => '', 'weight' => 0);
}
$transaction = db_transaction();
try {
// Allow modules to manually modify the list of files before the registry
// parses them. The $modules array provides the .info file information, which
// includes the list of files registered to each module. Any files in the
// list can then be added to the list of files that the registry will parse,
// or modify attributes of a file.
drupal_alter('registry_files', $files, $modules);
foreach (registry_get_parsed_files() as $filename => $file) {
// Add the hash for those files we have already parsed.
if (isset($files[$filename])) {
$files[$filename]['hash'] = $file['hash'];
}
else {
// Flush the registry of resources in files that are no longer on disc
// or are in files that no installed modules require to be parsed.
db_delete('registry')
->condition('filename', $filename)
->execute();
db_delete('registry_file')
->condition('filename', $filename)
->execute();
}
}
$parsed_files = _registry_parse_files($files);
$unchanged_resources = array();
$lookup_cache = array();
if ($cache = cache_get('lookup_cache', 'cache_bootstrap')) {
$lookup_cache = $cache->data;
}
foreach ($lookup_cache as $key => $file) {
// If the file for this cached resource is carried over unchanged from
// the last registry build, then we can safely re-cache it.
if ($file && in_array($file, array_keys($files)) && !in_array($file, $parsed_files)) {
$unchanged_resources[$key] = $file;
}
}
module_implements('', FALSE, TRUE);
_registry_check_code(REGISTRY_RESET_LOOKUP_CACHE);
}
catch (Exception $e) {
$transaction->rollback();
watchdog_exception('registry', $e);
throw $e;
}
// We have some unchanged resources, warm up the cache - no need to pay
// for looking them up again.
if (count($unchanged_resources) > 0) {
cache_set('lookup_cache', $unchanged_resources, 'cache_bootstrap');
}
}
/**
* Return the list of files in registry_file
*/
function registry_get_parsed_files() {
$files = array();
// We want the result as a keyed array.
$files = db_query("SELECT * FROM {registry_file}")->fetchAllAssoc('filename', PDO::FETCH_ASSOC);
return $files;
}
/**
* Parse all files that have changed since the registry was last built, and save their function and class listings.
*
* @param $files
* The list of files to check and parse.
*/
function _registry_parse_files($files) {
$parsed_files = array();
foreach ($files as $filename => $file) {
if (file_exists($filename)) {
$hash = hash_file('sha256', $filename);
if (empty($file['hash']) || $file['hash'] != $hash) {
$file['hash'] = $hash;
$parsed_files[$filename] = $file;
}
}
}
foreach ($parsed_files as $filename => $file) {
_registry_parse_file($filename, file_get_contents($filename), $file['module'], $file['weight']);
db_merge('registry_file')
->key(array('filename' => $filename))
->fields(array(
'hash' => $file['hash'],
))
->execute();
}
return array_keys($parsed_files);
}
/**
* Parse a file and save its function and class listings.
*
* @param $filename
* Name of the file we are going to parse.
* @param $contents
* Contents of the file we are going to parse as a string.
* @param $module
* (optional) Name of the module this file belongs to.
* @param $weight
* (optional) Weight of the module.
*/
function _registry_parse_file($filename, $contents, $module = '', $weight = 0) {
if (preg_match_all('/^\s*(?:abstract|final)?\s*(class|interface)\s+([a-zA-Z0-9_]+)/m', $contents, $matches)) {
foreach ($matches[2] as $key => $name) {
db_merge('registry')
->key(array(
'name' => $name,
'type' => $matches[1][$key],
))
->fields(array(
'filename' => $filename,
'module' => $module,
'weight' => $weight,
))
->execute();
}
// Delete any resources for this file where the name is not in the list
// we just merged in.
db_delete('registry')
->condition('filename', $filename)
->condition('name', $matches[2], 'NOT IN')
->execute();
}
}
/**
* @} End of "defgroup registry".
*/
