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DarkConsoleXHProfPluginAPI.php
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Created
Fri, Nov 29, 14:17

DarkConsoleXHProfPluginAPI.php
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<?php
/**
* @phutil-external-symbol function xhprof_enable
* @phutil-external-symbol function xhprof_disable
*/
final class DarkConsoleXHProfPluginAPI extends Phobject {
private static $profilerStarted;
private static $profilerRunning;
private static $profileFilePHID;
public static function isProfilerAvailable() {
return extension_loaded('xhprof');
}
public static function getProfilerHeader() {
return 'X-Phabricator-Profiler';
}
public static function isProfilerRequested() {
if (!empty($_REQUEST['__profile__'])) {
return $_REQUEST['__profile__'];
}
$header = AphrontRequest::getHTTPHeader(self::getProfilerHeader());
if ($header) {
return $header;
}
return false;
}
private static function shouldStartProfiler() {
if (self::isProfilerRequested()) {
return true;
}
static $sample_request = null;
if ($sample_request === null) {
if (PhabricatorEnv::getEnvConfig('debug.profile-rate')) {
$rate = PhabricatorEnv::getEnvConfig('debug.profile-rate');
if (mt_rand(1, $rate) == 1) {
$sample_request = true;
} else {
$sample_request = false;
}
}
}
return $sample_request;
}
public static function isProfilerStarted() {
return self::$profilerStarted;
}
private static function isProfilerRunning() {
return self::$profilerRunning;
}
public static function includeXHProfLib() {
// TODO: this is incredibly stupid, but we may not have Phutil metamodule
// stuff loaded yet so we can't just phutil_get_library_root() our way
// to victory.
$root = __FILE__;
for ($ii = 0; $ii < 6; $ii++) {
$root = dirname($root);
}
require_once $root.'/externals/xhprof/xhprof_lib.php';
}
public static function saveProfilerSample(PhutilDeferredLog $access_log) {
$file_phid = self::getProfileFilePHID();
if (!$file_phid) {
return;
}
if (self::isProfilerRequested()) {
$sample_rate = 0;
} else {
$sample_rate = PhabricatorEnv::getEnvConfig('debug.profile-rate');
}
$profile_sample = id(new PhabricatorXHProfSample())
->setFilePHID($file_phid)
->setSampleRate($sample_rate)
->setUsTotal($access_log->getData('T'))
->setHostname($access_log->getData('h'))
->setRequestPath($access_log->getData('U'))
->setController($access_log->getData('C'))
->setUserPHID($access_log->getData('P'));
AphrontWriteGuard::allowDangerousUnguardedWrites(true);
$caught = null;
try {
$profile_sample->save();
} catch (Exception $ex) {
$caught = $ex;
}
AphrontWriteGuard::allowDangerousUnguardedWrites(false);
if ($caught) {
throw $caught;
}
}
public static function hookProfiler() {
if (!self::shouldStartProfiler()) {
return;
}
if (!self::isProfilerAvailable()) {
return;
}
if (self::$profilerStarted) {
return;
}
self::startProfiler();
}
/**
* @phutil-external-symbol class PhabricatorStartup
*/
private static function startProfiler() {
PhabricatorStartup::beginStartupPhase('profiler.init');
self::includeXHProfLib();
xhprof_enable();
self::$profilerStarted = true;
self::$profilerRunning = true;
}
/**
* @phutil-external-symbol class PhabricatorStartup
*/
public static function getProfileFilePHID() {
if (!self::isProfilerRunning()) {
return;
}
PhabricatorStartup::beginStartupPhase('profiler.stop');
self::stopProfiler();
PhabricatorStartup::beginStartupPhase('profiler.done');
return self::$profileFilePHID;
}
private static function stopProfiler() {
$data = xhprof_disable();
$data = @json_encode($data);
self::$profilerRunning = false;
// Since these happen on GET we can't do guarded writes. These also
// sometimes happen after we've disposed of the write guard; in this
// case we need to disable the whole mechanism.
$use_scope = AphrontWriteGuard::isGuardActive();
if ($use_scope) {
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
} else {
AphrontWriteGuard::allowDangerousUnguardedWrites(true);
}
$caught = null;
try {
$file = call_user_func(
array('PhabricatorFile', 'newFromFileData'),
$data,
array(
'mime-type' => 'application/xhprof',
'name' => 'profile.xhprof',
));
} catch (Exception $ex) {
$caught = $ex;
}
if ($use_scope) {
unset($unguarded);
} else {
AphrontWriteGuard::allowDangerousUnguardedWrites(false);
}
if ($caught) {
throw $caught;
}
self::$profileFilePHID = $file->getPHID();
}
}

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