While working on #2040037: The requested page "/admin/appearance/settings/bartik" could not be found after installation, I noticed that we have system.theme.data and system.*.files as information managed by the Drupal::state() service, and then we put in various workarounds to deal with the fact that that service is unavailable during installation, or the backend might throw an exception. Since this information can be rebuilt at any time from the file system, why is it not in the cache system instead? That would let us remove all those workarounds.

Comments

effulgentsia’s picture

An example of what I mean is this code from drupal_get_filename():

try {
  $file_list = Drupal::state()->get('system.' . $type . '.files');
  if ($file_list && isset($file_list[$name]) && file_exists(DRUPAL_ROOT . '/' . $file_list[$name])) {
   $files[$type][$name] = $file_list[$name];
  }
}
catch (Exception $e) {
  // The keyvalue service raised an exception because the backend might
  // be down. We have a fallback for this case so we hide the error
  // completely.
}
// Fallback to searching the filesystem if the database could not find the
// file or the file returned by the database is not found.
if (!isset($files[$type][$name])) {
...

Isn't that silly? This makes it clear that nothing in that state entry is actually state. It's purely cache.

andypost’s picture

+1 to idea!
Suppose state is a persistent cache storage in the case but the problem with install|update services mostly lives in theme layer.
If this data would be moved to cache so some unpredictable cache clears could bring perf down...

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