To match the current thinking on disabling experimental features by default.

The intention here is to avoid doing state lookups for outliers in
`/_matrix/federation/v1/event`. Unfortunately that's expanded into something of
a rewrite of `filter_events_for_server`, which ended up trying to do that
operation in a couple of places.

This endpoint was removed from MSC2675 before it was approved.
It is currently unspecified (even in any MSCs) and therefore subject to
removal. It is not implemented by any known clients.

This also changes the bundled aggregation format for `m.annotation`,
which previously included pagination tokens for the `/aggregations`
endpoint, which are no longer useful.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

Co-authored-by: Erik Johnston <erik@matrix.org>

Hopefully this fixes #12257.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

The `MockHttpResource` and `MockKey` objects were unused
since #9396 (74af356b).

Filter the events returned from `/relations` for the requester's ignored users
in a similar way to `/messages` (and `/sync`).

Signed-off-by: Nicolas Werner <n.werner@famedly.com>

Co-authored-by: reivilibre <olivier@librepush.net>

* Try to detect borked package installations.

Fixes #12223.

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

We fetch the thread summary in two phases:

1. The summary that is shared by all users (count of messages and latest event).
2. Whether the requesting user has participated in the thread.

There's no use in attempting step 2 for events which did not return a summary
from step 1.

An error occured if a filter was supplied with `event_fields` which did not include
`unsigned`.

In that case, bundled aggregations are still added as the spec states it is allowed
for servers to add additional fields.

To handle cancellation, we ensure that `after_callback`s and
`exception_callback`s are always run, since the transaction will
complete on another thread regardless of cancellation.

We also wait until everything is done before releasing the
`CancelledError`, so that logging contexts won't get used after they
have been finished.

Signed-off-by: Sean Quah <seanq@element.io>

* Moves the relation pagination tests to a separate class.
* Move the assertion of the response code into the `_send_relation` helper.
* Moves some helpers into the base-class.

By using urljoin from the standard library and reducing the number
of places URLs are rebased.

Instead of fetching the raw account data and re-parsing it. The
ignored_users table is a denormalised version of the account data
for quick searching.

Signed-off-by: Sean Quah <seanq@element.io>

These decorators mostly support cancellation already. Add cancellation
tests and fix use of finished logging contexts by delaying cancellation,
as suggested by @erikjohnston.

Signed-off-by: Sean Quah <seanq@element.io>

Also convert `ReadWriteLock` to use async context managers.

Signed-off-by: Sean Quah <seanq@element.io>

`delay_cancellation` behaves like `stop_cancellation`, except it
delays `CancelledError`s until the original `Deferred` resolves.
This is handy for unifying cleanup paths and ensuring that uncancelled
coroutines don't use finished logcontexts.

Signed-off-by: Sean Quah <seanq@element.io>

And rename the field used for caching from _id to _cache_key.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

This test was relying on poking events which weren't in the database into
filter_events_for_client.

The unstable identifiers are still supported if the experimental configuration
flag is enabled. The unstable identifiers will be removed in a future release.