When figuring out which topological token to start a purge job at, we
need to do the following:
1. Figure out a timestamp before which events will be purged
2. Select the first stream ordering after that timestamp
3. Select info about the first event after that stream ordering
4. Build a topological token from that info
In some situations (e.g. quiet rooms with a short max_lifetime), there
might not be an event after the stream ordering at step 3, therefore we
abort the purge with the error `No event found`. To mitigate that, this
patch fetches the first event _before_ the stream ordering, instead of
after.
* 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))
