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

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

These are ids anyways, not mxc uris.

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

This is intended to be used by administrators to monitor the media that is passing through their server, if they wish.

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

Use the right path for url_preview thumbnails

This was introduced by #2627: we were overwriting the original media for url
previews with the thumbnails :/

(fixes https://github.com/vector-im/riot-web/issues/6012, hopefully)

Make storage providers configurable

Add decent impl of a FileConsumer

Fix bugs in block metrics

... which I introduced in #2785

better exception logging in callbackmetrics

when we fail to render a metric, give a clue as to which metric it was

Log room when doing state resolution

Mostly because it helps figure out what is prompting the resolution

Twisted core doesn't have a general purpose one, so we need to write one
ourselves.

Features:
- All writing happens in background thread
- Supports both push and pull producers
- Push producers get paused if the consumer falls behind

Keep track of last access time for local media

fix SQL when searching all users

Split resolve_events into two functions

... so that the return type doesn't depend on the arg types

Track DB scheduling delay per-request

Sanity checking for user ids

Check the user_id passed to a couple of APIs for validity, to avoid
"IndexError: list index out of range" exception which looks scary and results
in a 500 rather than a more useful error.

Fixes #1432, among other things

Track db txn time in millisecs