function _drupal_bootstrap_page_cache

Attempts to serve a page from the cache.

File

includes/bootstrap.inc, line 2729

Code

function _drupal_bootstrap_page_cache() {
    global $user;
    // Allow specifying special cache handlers in settings.php, like
    // using memcached or files for storing cache information.
    require_once DRUPAL_ROOT . '/includes/cache.inc';
    foreach (variable_get('cache_backends', array()) as $include) {
        require_once DRUPAL_ROOT . '/' . $include;
    }
    // Check for a cache mode force from settings.php.
    if (variable_get('page_cache_without_database')) {
        $cache_enabled = TRUE;
    }
    else {
        drupal_bootstrap(DRUPAL_BOOTSTRAP_VARIABLES, FALSE);
        $cache_enabled = variable_get('cache');
    }
    drupal_block_denied(ip_address());
    // If there is no session cookie and cache is enabled (or forced), try
    // to serve a cached page.
    if (!isset($_COOKIE[session_name()]) && $cache_enabled) {
        // Make sure there is a user object because its timestamp will be
        // checked, hook_boot might check for anonymous user etc.
        $user = drupal_anonymous_user();
        // Get the page from the cache.
        $cache = drupal_page_get_cache();
        // If there is a cached page, display it.
        if (is_object($cache)) {
            header('X-Drupal-Cache: HIT');
            // Restore the metadata cached with the page.
            $_GET['q'] = $cache->data['path'];
            drupal_set_title($cache->data['title'], PASS_THROUGH);
            date_default_timezone_set(drupal_get_user_timezone());
            // If the skipping of the bootstrap hooks is not enforced, call
            // hook_boot.
            if (variable_get('page_cache_invoke_hooks', TRUE)) {
                bootstrap_invoke_all('boot');
            }
            drupal_serve_page_from_cache($cache);
            // If the skipping of the bootstrap hooks is not enforced, call
            // hook_exit.
            if (variable_get('page_cache_invoke_hooks', TRUE)) {
                bootstrap_invoke_all('exit');
            }
            // We are done.
            exit;
        }
        else {
            header('X-Drupal-Cache: MISS');
        }
    }
}