* Remove redundant python2 support code
`str.decode()` doesn't exist on python3, so presumably this code was doing
nothing
* Filter out pushers with corrupt data
When we get a row with unparsable json, drop the row, rather than returning a
row with null `data`, which will then cause an explosion later on.
* Improve logging when we can't start a pusher
Log the ID to help us understand the problem
* Make email pusher setup more robust
We know we'll have a `data` member, since that comes from the database. What we
*don't* know is if that is a dict, and if that has a `brand` member, and if
that member is a string.
=============================
Bugfixes
--------
- Fix incorrect error message for invalid requests when setting user's avatar URL. ([\#6497](https://github.com/matrix-org/synapse/issues/6497))
- Fix support for SQLite 3.7. ([\#6499](https://github.com/matrix-org/synapse/issues/6499))
- Fix regression where sending email push would not work when using a pusher worker. ([\#6507](https://github.com/matrix-org/synapse/issues/6507), [\#6509](https://github.com/matrix-org/synapse/issues/6509))
-----BEGIN PGP SIGNATURE-----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=ABoZ
-----END PGP SIGNATURE-----
Merge tag 'v1.7.0rc2' into develop
Synapse 1.7.0rc2 (2019-12-11)
=============================
Bugfixes
--------
- Fix incorrect error message for invalid requests when setting user's avatar URL. ([\#6497](https://github.com/matrix-org/synapse/issues/6497))
- Fix support for SQLite 3.7. ([\#6499](https://github.com/matrix-org/synapse/issues/6499))
- Fix regression where sending email push would not work when using a pusher worker. ([\#6507](https://github.com/matrix-org/synapse/issues/6507), [\#6509](https://github.com/matrix-org/synapse/issues/6509))
have_events was a map from event_id to rejection reason (or None) for events
which are in our local database. It was used as filter on the list of
event_ids being passed into get_events_as_list. However, since
get_events_as_list will ignore any event_ids that are unknown or rejected, we
can equivalently just leave it to get_events_as_list to do the filtering.
That means that we don't have to keep `have_events` up-to-date, and can use
`have_seen_events` instead of `get_seen_events_with_rejection` in the one place
we do need it.
Implement part [MSC2228](https://github.com/matrix-org/matrix-doc/pull/2228). The parts that differ are:
* the feature is hidden behind a configuration flag (`enable_ephemeral_messages`)
* self-destruction doesn't happen for state events
* only implement support for the `m.self_destruct_after` field (not the `m.self_destruct` one)
* doesn't send synthetic redactions to clients because for this specific case we consider the clients to be able to destroy an event themselves, instead we just censor it (by pruning its JSON) in the database
