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phorge-phorge/webroot/index.php
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

101 lines
3.1 KiB
PHP

<?php
phabricator_startup();
$fatal_exception = null;
try {
PhabricatorStartup::beginStartupPhase('libraries');
PhabricatorStartup::loadCoreLibraries();
PhabricatorStartup::beginStartupPhase('purge');
PhabricatorCaches::destroyRequestCache();
PhabricatorStartup::beginStartupPhase('sink');
$sink = new AphrontPHPHTTPSink();
// PHP introduced a "Throwable" interface in PHP 7 and began making more
// runtime errors throw as "Throwable" errors. This is generally good, but
// makes top-level exception handling that is compatible with both PHP 5
// and PHP 7 a bit tricky.
// In PHP 5, "Throwable" does not exist, so "catch (Throwable $ex)" catches
// nothing.
// In PHP 7, various runtime conditions raise an Error which is a Throwable
// but NOT an Exception, so "catch (Exception $ex)" will not catch them.
// To cover both cases, we "catch (Exception $ex)" to catch everything in
// PHP 5, and most things in PHP 7. Then, we "catch (Throwable $ex)" to catch
// everything else in PHP 7. For the most part, we only need to do this at
// the top level.
$main_exception = null;
try {
PhabricatorStartup::beginStartupPhase('run');
AphrontApplicationConfiguration::runHTTPRequest($sink);
} catch (Exception $ex) {
$main_exception = $ex;
} catch (Throwable $ex) {
$main_exception = $ex;
}
if ($main_exception) {
$response_exception = null;
try {
$response = new AphrontUnhandledExceptionResponse();
$response->setException($main_exception);
PhabricatorStartup::endOutputCapture();
$sink->writeResponse($response);
} catch (Exception $ex) {
$response_exception = $ex;
} catch (Throwable $ex) {
$response_exception = $ex;
}
// If we hit a rendering exception, ignore it and throw the original
// exception. It is generally more interesting and more likely to be
// the root cause.
if ($response_exception) {
throw $main_exception;
}
}
} catch (Exception $ex) {
$fatal_exception = $ex;
} catch (Throwable $ex) {
$fatal_exception = $ex;
}
if ($fatal_exception) {
PhabricatorStartup::didEncounterFatalException(
'Core Exception',
$fatal_exception,
false);
}
function phabricator_startup() {
// Load the PhabricatorStartup class itself.
$t_startup = microtime(true);
$root = dirname(dirname(__FILE__));
require_once $root.'/support/startup/PhabricatorStartup.php';
// Load client limit classes so the preamble can configure limits.
require_once $root.'/support/startup/PhabricatorClientLimit.php';
require_once $root.'/support/startup/PhabricatorClientRateLimit.php';
require_once $root.'/support/startup/PhabricatorClientConnectionLimit.php';
// If the preamble script exists, load it.
$t_preamble = microtime(true);
$preamble_path = $root.'/support/preamble.php';
if (file_exists($preamble_path)) {
require_once $preamble_path;
}
$t_hook = microtime(true);
PhabricatorStartup::didStartup($t_startup);
PhabricatorStartup::recordStartupPhase('startup.init', $t_startup);
PhabricatorStartup::recordStartupPhase('preamble', $t_preamble);
PhabricatorStartup::recordStartupPhase('hook', $t_hook);
}