#688294 by Berdir, andypost, Crell, catch: Fixed Switch from db_is_active() to...

#688294 by Berdir, andypost, Crell, catch: Fixed Switch from db_is_active() to proper exception catching.

includes/authorize.inc

@@ -159,7 +159,7 @@ function authorize_filetransfer_form_submit($form, &$form_state) {
       // to make sure it is available since this code could potentially (will
       // likely) be called during the installation process, before the
       // database is set up.
-      if (db_is_active()) {
+      try {
         $connection_settings = array();
         foreach ($form_state['values']['connection_settings'][$filetransfer_backend] as $key => $value) {
           // We do *not* want to store passwords in the database, unless the
@@ -186,6 +186,11 @@ function authorize_filetransfer_form_submit($form, &$form_state) {
         // Now run the operation.
         authorize_run_operation($filetransfer);
       }
+      catch (Exception $e) {
+        // If there is no database available, we don't care and just skip
+        // this part entirely.
+      }
+
       break;
 
     case 'enter_connection_settings':

includes/bootstrap.inc

@@ -1687,7 +1687,7 @@ function drupal_is_denied($ip) {
   // won't be denied. However the user asked explicitly not to use the
   // database and also in this case it's quite likely that the user relies
   // on higher performance solutions like a firewall.
-  elseif (function_exists('db_is_active')) {
+  elseif (class_exists('Database', FALSE)) {
     $denied = (bool)db_query("SELECT 1 FROM {blocked_ips} WHERE ip = :ip", array(':ip' => $ip))->fetchField();
   }
   return $denied;

includes/database/database.inc

@@ -608,7 +608,7 @@ protected function expandArguments(&$query, &$args) {
       // Update the query with the new placeholders.
       // preg_replace is necessary to ensure the replacement does not affect
       // placeholders that start with the same exact text. For example, if the
-      // query contains the placeholders :foo and :foobar, and :foo has an 
+      // query contains the placeholders :foo and :foobar, and :foo has an
       // array of values, using str_replace would affect both placeholders,
       // but using the following preg_replace would only affect :foo because
       // it is followed by a non-word character.
@@ -1367,8 +1367,7 @@ final public static function getConnection($target = 'default', $key = NULL) {
       // If necessary, a new connection is opened.
       self::$connections[$key][$target] = self::openConnection($key, $target);
     }
-
-    return isset(self::$connections[$key][$target]) ? self::$connections[$key][$target] : NULL;
+    return self::$connections[$key][$target];
   }
 
   /**
@@ -1501,11 +1500,11 @@ final protected static function openConnection($key, $target) {
       // If the requested database does not exist then it is an unrecoverable
       // error.
       if (!isset(self::$databaseInfo[$key])) {
-        throw new Exception('DB does not exist');
+        throw new DatabaseConnectionNotDefinedException('The specified database connection is not defined: ' . $key);
       }
 
       if (!$driver = self::$databaseInfo[$key][$target]['driver']) {
-        throw new Exception('Drupal is not set up');
+        throw new DatabaseDriverNotSpecifiedException('Driver not specified for this database connection: ' . $key);
       }
 
       // We cannot rely on the registry yet, because the registry requires an
@@ -1624,6 +1623,17 @@ class FieldsOverlapException extends Exception {}
  */
 class NoFieldsException extends Exception {}
 
+/**
+ * Exception thrown if an undefined database connection is requested.
+ */
+class DatabaseConnectionNotDefinedException extends Exception {}
+
+/**
+ * Exception thrown if no driver is specified for a database connection.
+ */
+class DatabaseDriverNotSpecifiedException extends Exception {}
+
+
 /**
  * A wrapper class for creating and managing database transactions.
  *
@@ -2419,20 +2429,6 @@ function db_set_active($key = 'default') {
   return Database::setActiveConnection($key);
 }
 
-/**
- * Determines if there is an active connection.
- *
- * Note that this method will return FALSE if no connection has been established
- * yet, even if one could be.
- *
- * @return
- *   TRUE if there is at least one database connection established, FALSE
- *   otherwise.
- */
-function db_is_active() {
-  return Database::isActiveConnection();
-}
-
 /**
  * Restricts a dynamic table, column, or constraint name to safe characters.
  *

includes/theme.inc

@@ -572,13 +572,19 @@ function list_themes($refresh = FALSE) {
     $themes = array();
     // Extract from the database only when it is available.
     // Also check that the site is not in the middle of an install or update.
-    if (!defined('MAINTENANCE_MODE') && db_is_active()) {
-      foreach (system_list('theme') as $theme) {
-        if (file_exists($theme->filename)) {
-          $theme->info = unserialize($theme->info);
-          $themes[] = $theme;
+    if (!defined('MAINTENANCE_MODE')) {
+      try {
+        foreach (system_list('theme') as $theme) {
+          if (file_exists($theme->filename)) {
+            $theme->info = unserialize($theme->info);
+            $themes[] = $theme;
+          }
         }
       }
+      catch (Exception $e) {
+        // If the database is not available, rebuild the theme data.
+        $themes = _system_rebuild_theme_data();
+      }
     }
     else {
       // Scan the installation when the database should not be read.
@@ -2094,19 +2100,27 @@ function _template_preprocess_default_variables() {
     'title_prefix' => array(),
     'title_suffix' => array(),
     'user' => $user,
-    'db_is_active' => !defined('MAINTENANCE_MODE') && db_is_active(),
+    'db_is_active' => !defined('MAINTENANCE_MODE'),
+    'is_admin' => FALSE,
+    'logged_in' => FALSE,
   );
 
-  // Variables that depend on a database connection.
-  if ($variables['db_is_active']) {
+  // user_access() does not exist when the database is not available because
+  // user.module has not been included.
+  if (function_exists('user_access')) {
     $variables['is_admin'] = user_access('access administration pages');
-    $variables['is_front'] = drupal_is_front_page();
     $variables['logged_in'] = ($user->uid > 0);
   }
-  else {
-    $variables['is_admin'] = FALSE;
+
+  // drupal_is_front_page() might throw an exception.
+  try {
+    $variables['is_front'] = drupal_is_front_page();
+  }
+  catch (Exception $e) {
+    // If the database is not yet available, set default values for these
+    // variables.
     $variables['is_front'] = FALSE;
-    $variables['logged_in'] = FALSE;
+    $variables['db_is_active'] = FALSE;
   }
 
   return $variables;