Summary:
Ref T13008. We haven't hit any issues with this, but I can imagine we might in the future.
When one host makes an intracluster request to another host, the `$viewer` ends up as the omnipotent viewer. This viewer isn't logged in, so they'll currently accumulate rate limit points at a high rate.
Instead, don't give them any points. These requests are always legitimate, and if they originated from a user request, that request should be the one getting rate limited.
Test Plan: Browsed around.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13008
Differential Revision: https://secure.phabricator.com/D18708
Summary:
Depends on D18702. Ref T13008. This replaces the old hard-coded single rate limit with multiple flexible limits, and defines two types of limits:
- Rate: reject requests if a client has completed too many requests recently.
- Connection: reject requests if a client has too many more connections than disconnections recently.
The connection limit adds +1 to the score for each connection, then adds -1 for each disconnection. So the overall number is how many open connections they have, at least approximately.
Supporting multiple limits will let us do limiting by Hostname and by remote address (e.g., a specific IP can't exceed a low limit, and all requests to a hostname can't exceed a higher limit).
Configuring the new limits looks something like this:
```
PhabricatorStartup::addRateLimit(new PhabricatorClientRateLimit())
->setLimitKey('rate')
->setClientKey($_SERVER['REMOTE_ADDR'])
->setLimit(5);
PhabricatorStartup::addRateLimit(new PhabricatorClientConnectionLimit())
->setLimitKey('conn')
->setClientKey($_SERVER['REMOTE_ADDR'])
->setLimit(2);
```
Test Plan:
- Configured limits as above.
- Made a lot of requests, got cut off by the rate limit.
- Used `curl --limit-rate -F 'data=@the_letter_m.txt' ...` to upload files really slowly. Got cut off by the connection limit. With `enable_post_data_reading` off, this correctly killed the connections //before// the uploads finished.
- I'll send this stuff to `secure` before production to give it more of a chance.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13008
Differential Revision: https://secure.phabricator.com/D18703
