Fixes https://github.com/matrix-org/synapse/issues/3050.

Improve logging and comments. Group all the stuff to do with inspecting tables
together rather than creating the port tables in the middle.

We really shouldn't spit out "Failed to create port table", it looks scary.

Add a blurb explaining the main synapse worker

Add room_id to the response of `rooms/{roomId}/join`

Improve database cache performance

Remove redundant metrics which were deprecated in 0.27.0.

Fixes an issue where a cache invalidation would invalidate *all* pending
entries, rather than just the entry that we intended to invalidate.

Add joinability for groups

R30 stats

Remove uses of events.content

Use iteritems over item to loop over dict
formatting

phone home cache size configurations

Fixes https://github.com/matrix-org/synapse/issues/3018



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

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

Revert "improve mxid check performance"

Replace old style error catching with 'as' keyword

Add basic performance statistics to phone home

improve mxid check performance

The API is now under
 /groups/$group_id/setting/m.join_policy

and expects a JSON blob of the shape

```json
{
  "m.join_policy": {
    "type": "invite"
  }
}
```

where "invite" could alternatively be "open".

Use static JSONEncoders

json encoders have an encode method, not a dumps method.

Use simplejson throughout

Signed-off-by: Adrian Tschira <nota@notafile.com>

using json.dumps with custom options requires us to create a new JSONEncoder on
each call. It's more efficient to create one upfront and reuse it.

Let's use simplejson rather than json, for consistency.

Measure time it takes to calculate state group ID