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Author SHA1 Message Date
epriestley
b9a1260ef5 Improve top-level fatal exception handling in PHP 7+
Summary:
Depends on D20137. Ref T13250. Ref T12101. In versions of PHP beyond 7, various engine errors are gradually changing from internal fatals or internal errors to `Throwables`, a superclass of `Exception`.

This is generally a good change, but code written against PHP 5.x before `Throwable` was introduced may not catch these errors, even when the code is intended to be a top-level exception handler.

(The double-catch pattern here and elsewhere is because `Throwable` does not exist in older PHP, so `catch (Throwable $ex)` catches nothing. The `Exception $ex` clause catches everything in old PHP, the `Throwable $ex` clause catches everything in newer PHP.)

Generalize some `Exception` into `Throwable`.

Test Plan:
  - Added a bogus function call to the rendering stack.
  - Before change: got a blank page.
  - After change: nice exception page.

{F6205012}

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13250, T12101

Differential Revision: https://secure.phabricator.com/D20138
2019-02-11 15:05:15 -08:00
epriestley
c32fa06266 Use phutil_microseconds_since(...) to simplify some timing arithmetic
Summary: Depends on D19796. Simplify some timing code by using phutil_microseconds_since() instead of duplicate casting and arithmetic.

Test Plan: Grepped for `1000000` to find these. Pulled, pushed, made a conduit call. This isn't exhaustive but it should be hard for these to break in a bad way since they're all just diagnostic.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D19797
2018-11-08 16:46:32 -08:00
epriestley
7e6bae471c Always setlocale() to en_US.UTF-8 for the main process
Summary:
Depends on D18987. See PHI343. Fixes T13060. See also T7339.

When the main process starts up with `LANG=POSIX` (this is the default on Ubuntu) and we later try to run a subprocess with a UTF8 character in the argument list (like `git cat-file blob 🐑.txt`), the argument is not passed to the subprocess correctly.

We already set `LANG=en_US.UTF-8` in the //subprocess// environment, but this only controls behavior for the subprocess itself. It appears that the argument list encoding before the actual subprocess starts depends on the parent process's locale setting, which makes some degree of sense.

Setting `putenv('LANG=en_US.UTF-8')` has no effect on this, but my guess is that the parent process's locale setting is read at startup (rather than read anew from `LANG` every time) and not changed by further modifications of `LANG`.

Using `setlocale(...)` does appear to fix this.

Ideally, installs would probably set some UTF-8-compatible LANG setting as the default. However, this makes setup harder and I couldn't figure out how to do it on our production Ubuntu AMI after spending a reasonable amount of time at it (see T13060).

Since it's very rare that this setting matters, try to just do the right thing. This may fail if "en_US.UTF-8" isn't available, but I think warnings/remedies to this are in the scope of T7339, since we want this locale to exist for other legitimate reasons anyway.

Test Plan:
  - Applied this fix in production, processed the failing worker task from PHI343 after kicking Apache hard enough.
  - Ran locally with `setlocale(LC_ALL, 'duck.quack')` to make sure a bad/invalid/unavailable setting didn't break anything, didn't hit any issues.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13060

Differential Revision: https://secure.phabricator.com/D18988
2018-02-05 12:23:06 -08:00
epriestley
0e645b8f11 Disconnect rate limits in the PhabricatorStartup shutdown handler
This makes counts more accurate, particularly for connection limits.
2017-10-14 07:14:31 -07:00
epriestley
3f53718d10 Modularize rate/connection limits in Phabricator
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
2017-10-13 13:12:05 -07:00
Renamed from support/PhabricatorStartup.php (Browse further)