Objectstorage callback wrapper skips wrapped caches

[rullzer]

How to test:

1. setup S3 as primary storage
2. add a tag 'test'
3. enable files_automated tagging and have a rule to assing 'test'
4. upload a file

The tag should be added. But it is not added.

The reason for this is in:

server/lib/private/Files/ObjectStore/ObjectStoreStorage.php

Line 408 in d054699

$fileId = $this->getCache()->put($path, $stat);

When we reach the fopen of the objectstorage we do an fopen with a callbackwrapper.
Now when we perform the fclose we directly land in the writeBack function. If in here we request the cache we just get back the cache at that point. So there are no wrappers around it. Which means that automated tagging can't do its job and add the tag.

[nextcloud-bot]

GitMate.io thinks possibly related issues are #1652 (Storage wrapper warnings), #8483 (Preview cache issue ), #9005 (c), #2330 (LDAP user refresh with caching enabled), and #3703 (ts).

[MorrisJobke]

new event is in: #13748

[MorrisJobke]

Potential fixes in the tagging:

• Fix tagging of objectstore uploads files_automatedtagging#70
• use cache insert event for automated tagging files_automatedtagging#71

[rullzer]

Works now 🚀