function image_style_flood_lock_name

1 image.module image_style_flood_lock_name()

Check available image style locks to see if any are available.

This function checks the site-wide setting for maximum simultaneous unauthorized image generations. It uses the locking mechanism rather than the flood control system because this is a site-wide limit and locks are released immediately when the image is generated. So rather than limiting the total number of images generated per time period, it limits the total number of simultaneous images.

Return value

string|FALSE: The lock name if a lock could be acquired. FALSE if the maximum number of images is already being generated.

2 calls to image_style_flood_lock_name()

ImageStyleFloodProtection::testFloodProtection in core/modules/image/tests/image.test: Check the number of images that can be generated simultaneously.
image_style_deliver in core/modules/image/image.module: Menu callback; Given a style and image path, generate a derivative.

File

core/modules/image/image.module, line 1134: Exposes global functionality for creating image styles.

Code

function image_style_flood_lock_name() {
  $max_locks = config_get('system.core', 'image_style_flood_limit');
  $max_locks = isset($max_locks) ? $max_locks : 5;
  for ($n = 0; $n < $max_locks; $n++) {
    $lock_name = 'image_style_flood_' . $n;
    if (lock_may_be_available($lock_name) && lock_acquire($lock_name)) {
      return $lock_name;
    }
  }

  // No locks available.
  return FALSE;
}