When _get_state_for_groups is given a wildcard filter, just do a complete
lookup. Hopefully this will give us the best of both worlds by not filling up
the ram if we only need one or two keys, but also making the cache still work
for the federation reader usecase.

Optimise state_group_cache update

Log number of events fetched from DB

so that we can stub it for the sentinel and not have a billion failing UTs

Fix description of "python_gc_time" metric

When we finish processing a request, log the number of events we fetched from
the database to handle it.

[I'm trying to figure out which requests are responsible for large amounts of
event cache churn. It may turn out to be more helpful to add counts to the
prometheus per-request/block metrics, but that is an extension to this code
anyway.]

Write a clear restart indicator in logs

Add error code to room creation error

I'm fed up with never being able to find the point a server restarted in the
logs.

SECURITY UPDATE: Prevent unauthorised users from setting state events in a room
when there is no `m.room.power_levels` event in force in the room. (PR #3397)

Discussion around the Matrix Spec change proposal for this change can be
followed at https://github.com/matrix-org/matrix-doc/issues/1304.

Adjust event auth rules when there is no PL event

We need power levels for this test to do what it is supposed to do.

This error code is mentioned in the documentation at https://matrix.org/docs/api/client-server/#!/Room32creation/createRoom

Make it so that, before there is a power-levels event in the room, you need a
power level of at least 50 to send state.

Partially addresses https://github.com/matrix-org/matrix-doc/issues/1192

stop pretending that it returns a boolean, which just almost gave me a heart
attack.

it makes it easier for me to reason about

Fix commandline federation_client to send the right Host header

Use the correct flag (enable_metrics) when warning about an incorrect metrics setup

Use the RegistryProxy for appservices too

Signed-off-by: Travis Ralston <travpc@gmail.com>

Signed-off-by: Travis Ralston <travpc@gmail.com>

This appears to have stopped working since matrix.org moved to cloudflare. The
Host header should match the name of the server, not whatever is in the SRV
record.

(1) matrix-org-hotfixes has removed the intern calls; let's do the same here.
(2) remove redundant iteritems() so we can used an optimised db update.

Remove email addresses / phone numbers from ID servers when they're removed from synapse

Changes in synapse v0.31.1 (2018-06-08)
=======================================

v0.31.1 fixes a security bug in the ``get_missing_events`` federation API
where event visibility rules were not applied correctly.

We are not aware of it being actively exploited but please upgrade asap.

Bug Fixes:

* Fix event filtering in get_missing_events handler (PR #3371)