Problem/Motivation

From #2551989-7: Move replacing of placeholders from HtmlRenderer to HtmlResponseAttachmentsProcessor:

I've spent some time on IRC discussing this change on IRC with @Wim Leers I'm that happy that we're injecting and using renderer.config into the HtmlRenderer and using it. We discussed several work around including:

  • Relying on HtmlResponseAttachmentsProcessor to add them, This does not work because HtmlRenderer needs to return a properly cacheable response with all cache contexts
  • Adding a new method on the Renderer that does renderRoot without the placeholdering. This seems suboptimal ... it is alreadt hard to work out when to use renderRoot(), renderPlain() and just plain ol' render().
  • Maybe we should rename renderer.config to something that does not seem so specific.

I think only the last one is actually worth pursuing and we can do that as a followup.

This is that follow-up.

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

None.

API changes

TBD

Data model changes

None.

Comments

Wim Leers created an issue. See original summary.

wim leers’s picture

wim leers
Location Ghent 🇧🇪🇪🇺
commented
Issue summary: View changes
wim leers’s picture

wim leers
Location Ghent 🇧🇪🇪🇺
commented

Having thought about this, I can't think of a better name. :(

The easiest solution would be to have Renderer::render() always add the required cache contexts, but that'd result in more cache context merging work. That's why the current code looks like this:

    // Set the bubbleable rendering metadata that has configurable defaults, if:
    // - this is the root call, to ensure that the final render array definitely
    //   has these configurable defaults, even when no subtree is render cached.
    // - this is a render cacheable subtree, to ensure that the cached data has
    //   the configurable defaults (which may affect the ID and invalidation).
    if ($is_root_call || isset($elements['#cache']['keys'])) {
      $required_cache_contexts = $this->rendererConfig['required_cache_contexts'];
      if (isset($elements['#cache']['contexts'])) {
        $elements['#cache']['contexts'] = Cache::mergeContexts($elements['#cache']['contexts'], $required_cache_contexts);
      }
      else {
        $elements['#cache']['contexts'] = $required_cache_contexts;
      }
    }

It was Fabian who proposed this at #2453059-25: Set default render cache contexts: 'theme' + 'languages:' . LanguageInterface::TYPE_INTERFACE.2. This is definitely going to be faster, but the downside is that we now have this issue. If we didn't have that perf optimization, then we could make HtmlRenderer simpler, and the naming of renderer.config does not need to be rethought (which is difficult).

So, perhaps what we should do is profile it, to see what the perf delta is between HEAD (with that if-statement) vs without that if-statement.

wim leers’s picture

wim leers
Location Ghent 🇧🇪🇪🇺
commented
Related issues: +#2453059: Set default render cache contexts: 'theme' + 'languages:' . LanguageInterface::TYPE_INTERFACE
dawehner’s picture

dawehner
Primary language German
commented

Also renaming config requires a container rebuild. We; should be aware of that before just going with the rename.

Version: 8.0.x-dev » 8.1.x-dev

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smustgrave’s picture

smustgrave commented
Status: Active » Postponed (maintainer needs more info)
Issue tags: +stale-issue-cleanup

Thank you for creating this issue to improve Drupal.

We are working to decide if this task is still relevant to a currently supported version of Drupal. There hasn't been any discussion here for over 8 years which suggests that this has either been implemented or is no longer relevant. Your thoughts on this will allow a decision to be made.

Since we need more information to move forward with this issue, the status is now Postponed (maintainer needs more info). If we don't receive additional information to help with the issue, it may be closed after three months.

Thanks!

smustgrave’s picture

smustgrave commented

Wanted to bump 1 more time.

Version: 11.x-dev » main

Drupal core is now using the main branch as the primary development branch. New developments and disruptive changes should now be targeted to the main branch.

Read more in the announcement.