This PR remove the cache for the `get_shared_rooms_for_users` storage method (the db method driving the experimental "what rooms do I share with this user?" feature: [MSC2666](https://github.com/matrix-org/matrix-doc/pull/2666)). Currently subsequent requests to the endpoint will return the same result, even if your shared rooms with that user have changed.
The cache was added in https://github.com/matrix-org/synapse/pull/7785, but we forgot to ensure it was invalidated appropriately.
Upon attempting to invalidate it, I found that the cache had to be entirely invalidated whenever a user (remote or local) joined or left a room. This didn't make for a very useful cache, especially for a function that may or may not be called very often. Thus, I've opted to remove it instead of invalidating it.
* Add shared_rooms api
* Add changelog
* Add .
* Wrap response in {"rooms": }
* linting
* Add unstable_features key
* Remove options from isort that aren't part of 5.x
`-y` and `-rc` are now default behaviour and no longer exist.
`dont-skip` is no longer required
https://timothycrosley.github.io/isort/CHANGELOG/#500-penny-july-4-2020
* Update imports to make isort happy
* Add changelog
* Update tox.ini file with correct invocation
* fix linting again for isort
* Vendor prefix unstable API
* Fix to match spec
* import Codes
* import Codes
* Use FORBIDDEN
* Update changelog.d/7785.feature
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
* Implement get_shared_rooms_for_users
* a comma
* trailing whitespace
* Handle the easy feedback
* Switch to using runInteraction
* Add tests
* Feedback
* Seperate unstable endpoint from v2
* Add upgrade node
* a line
* Fix style by adding a blank line at EOF.
* Update synapse/storage/databases/main/user_directory.py
Co-authored-by: Tulir Asokan <tulir@maunium.net>
* Update synapse/storage/databases/main/user_directory.py
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
* Update UPGRADE.rst
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
* Fix UPGRADE/CHANGELOG unstable paths
unstable unstable unstable
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
Co-authored-by: Tulir Asokan <tulir@maunium.net>
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: Tulir Asokan <tulir@maunium.net>
