* drop room pdu linearizer sooner

No point holding onto it while we recheck the db

* move out `missing_prevs` calculation

we're going to need `missing_prevs` whatever we do, so we may as well calculate
it eagerly and just update it if it gets outdated.

* Add another `if missing_prevs` condition

this should be a no-op, since all the code inside the block already checks `if
missing_prevs`

* reorder if conditions

This shouldn't change the logic at all.

* Push down `min_depth` read

No point reading it from the database unless we're going to use it.

* Collect the sent_to_us_directly code together

Move the remaining `sent_to_us_directly` code inside the `if
sent_to_us_directly` block.

* Properly separate the `not sent_to_us_directly` branch

Since the only way this second block is now reachable is if we
*didn't* go into the `sent_to_us_directly` branch, we can replace it with a
simple `else`.

* changelog

Port the PresenceRouter module interface to the new generic interface introduced in v1.37.0

Marking things as outliers to inhibit pushes is a sledgehammer to crack a
nut. Move the test further down the stack so that we just inhibit the thing we
want.

Signed-off-by: Dirk Klimpel <dirk@klimpel.org>

Allow using several directories in read_templates.

This adds a new API GET /_synapse/admin/v1/username_available?username=foo to check if a username is available. It is the counterpart to https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-register-available, except that it works even if registration is disabled.

Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

* Include outlier status in `str(event)`

In places where we log event objects, knowing whether or not you're dealing
with an outlier is super useful.

* Remove duplicated logging in get_missing_events

When we process events received from get_missing_events, we log them twice
(once in `_get_missing_events_for_pdu`, and once in `on_receive_pdu`). Reduce
the duplication by removing the logging in `on_receive_pdu`, and ensuring the
call sites do sensible logging.

* log in `on_receive_pdu` when we already have the event

* Log which prev_events we are missing

* changelog

* Handle string read receipt data

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Test that we handle string read receipt data

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Add changelog for #10606

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Add docs

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Ignore malformed RRs

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Only surround hidden = ...

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Remove unnecessary argument

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Update changelog.d/10606.bugfix

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

* Move /batch_send to /v2_alpha directory

As pointed out by @erikjohnston,
https://github.com/matrix-org/synapse/pull/10552#discussion_r685836624

Remove references to BuildKite in favour of GitHub Actions

Should have been more systematic with my grepping.

As opposed to only allowing the summary of spaces which the user is
already in or has world-readable visibility.

This makes the logic consistent with whether a space/room is returned
as part of a space and whether a space summary can start at a space.

And ensure that the file is checked via mypy.

Signed-off-by: Marcus Hoffmann <bubu@bubu1.eu>
Signed-off-by: Dirk Klimpel <dirk@klimpel.org>

* Only return state events that the AS passed in via state_events_at_start

As discovered by @Half-Shot in
https://github.com/matrix-org/matrix-doc/pull/2716#discussion_r684158448

Part of MSC2716

* Add changelog

* Fix changelog extension