New hook: cache_clearing_end

[gilbert-hop]

Is your feature request related to a problem? Please describe.
We'd like to create some extensions that can fire after the user click clear cache in the CP.

Describe the solution you'd like
When the user chooses to flush cache in the Cache Manager, an extension hook is triggered.

Describe alternatives you've considered

Teachability, Documentation, Adoption, Migration Strategy
cache_clearing_end ($witch = 'all')
Fires when the cache clearing sequence has ended.

• I am capable and would like to work on implementation of this feature if it is considered.

[intoeetive]

Wouldn't it be better to implement the hook in functions library, or the cache library itself? Otherwise, I think the more hooks, the better

[gilbert-hop]

In my test, I added to the legacy/libraries/Functions.php

    /**
     * Delete cache files
     *
     * @access	public
     * @param	string
     * @return	string
     */
    public function clear_caching($which, $sub_dir = '')
    {
        $options = array('page', 'db', 'tag', 'sql');

        if (in_array($which, $options)) {
            ee()->cache->delete('/' . $which . '_cache/');
        } elseif ($which == 'all') {
            foreach ($options as $option) {
                ee()->cache->delete('/' . $option . '_cache/');
            }
        }
        if ($which == 'jumpmenu') {
            ee('CP/JumpMenu')->clearAllCaches();
        }
        if (ee()->extensions->active_hook('cache_clearing_end') === TRUE) {
            $result = ee()->extensions->call('cache_clearing_end', $which);
        }
    }

I think this is the desired location?

[intoeetive]

It probably is. Just be aware that in some places ee()->cache->delete is called directly as well to clear some very specific caches

[gilbert-hop]

But the cache_clearning() method is not called every time ee()->cache->delete() is called right? Basically, I want to fire a hook when the user click Clear Caches on ?/cp/utilities/cache. Or are you saying that we should add the extension to the cache library directly so that all ee()->cache->delete() calls will trigger the extension hook?

[intoeetive]

legacy/libraries/Functions.php might be the good place then