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MultimeterControl.php
064d9a9bfd62production

MultimeterControl.php
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			<?php

			final class MultimeterControl extends Phobject {

			private static $instance;

			private $events = array();
			private $sampleRate;
			private $pauseDepth;

			private $eventViewer;
			private $eventContext;

			private function __construct() {
			// Private.
			}

			public static function newInstance() {
			$instance = new MultimeterControl();

			// NOTE: We don't set the sample rate yet. This allows the multimeter to
			// be initialized and begin recording events, then make a decision about
			// whether the page will be sampled or not later on (once we've loaded
			// enough configuration).

			self::$instance = $instance;
			return self::getInstance();
			}

			public static function getInstance() {
			return self::$instance;
			}

			public function isActive() {
			return ($this->sampleRate !== 0) && ($this->pauseDepth == 0);
			}

			public function setSampleRate($rate) {
			if ($rate && (mt_rand(1, $rate) == $rate)) {
			$sample_rate = $rate;
			} else {
			$sample_rate = 0;
			}

			$this->sampleRate = $sample_rate;

			return;
			}

			public function pauseMultimeter() {
			$this->pauseDepth++;
			return $this;
			}

			public function unpauseMultimeter() {
			if (!$this->pauseDepth) {
			throw new Exception(pht('Trying to unpause an active multimeter!'));
			}
			$this->pauseDepth--;
			return $this;
			}


			public function newEvent($type, $label, $cost) {
			if (!$this->isActive()) {
			return null;
			}

			$event = id(new MultimeterEvent())
			->setEventType($type)
			->setEventLabel($label)
			->setResourceCost($cost)
			->setEpoch(PhabricatorTime::getNow());

			$this->events[] = $event;

			return $event;
			}

			public function saveEvents() {
			if (!$this->isActive()) {
			return;
			}

			$events = $this->events;
			if (!$events) {
			return;
			}

			if ($this->sampleRate === null) {
			throw new PhutilInvalidStateException('setSampleRate');
			}

			$this->addServiceEvents();

			// Don't sample any of this stuff.
			$this->pauseMultimeter();

			$use_scope = AphrontWriteGuard::isGuardActive();
			if ($use_scope) {
			$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
			} else {
			AphrontWriteGuard::allowDangerousUnguardedWrites(true);
			}

			$caught = null;
			try {
			$this->writeEvents();
			} catch (Exception $ex) {
			$caught = $ex;
			}

			if ($use_scope) {
			unset($unguarded);
			} else {
			AphrontWriteGuard::allowDangerousUnguardedWrites(false);
			}

			$this->unpauseMultimeter();

			if ($caught) {
			throw $caught;
			}
			}

			private function writeEvents() {
			$events = $this->events;

			$random = Filesystem::readRandomBytes(32);
			$request_key = PhabricatorHash::digestForIndex($random);

			$host_id = $this->loadHostID(php_uname('n'));
			$context_id = $this->loadEventContextID($this->eventContext);
			$viewer_id = $this->loadEventViewerID($this->eventViewer);
			$label_map = $this->loadEventLabelIDs(mpull($events, 'getEventLabel'));

			foreach ($events as $event) {
			$event
			->setRequestKey($request_key)
			->setSampleRate($this->sampleRate)
			->setEventHostID($host_id)
			->setEventContextID($context_id)
			->setEventViewerID($viewer_id)
			->setEventLabelID($label_map[$event->getEventLabel()])
			->save();
			}
			}

			public function setEventContext($event_context) {
			$this->eventContext = $event_context;
			return $this;
			}

			public function getEventContext() {
			return $this->eventContext;
			}

			public function setEventViewer($viewer) {
			$this->eventViewer = $viewer;
			return $this;
			}

			private function loadHostID($host) {
			$map = $this->loadDimensionMap(new MultimeterHost(), array($host));
			return idx($map, $host);
			}

			private function loadEventViewerID($viewer) {
			$map = $this->loadDimensionMap(new MultimeterViewer(), array($viewer));
			return idx($map, $viewer);
			}

			private function loadEventContextID($context) {
			$map = $this->loadDimensionMap(new MultimeterContext(), array($context));
			return idx($map, $context);
			}

			private function loadEventLabelIDs(array $labels) {
			return $this->loadDimensionMap(new MultimeterLabel(), $labels);
			}

			private function loadDimensionMap(MultimeterDimension $table, array $names) {
			$hashes = array();
			foreach ($names as $name) {
			$hashes[] = PhabricatorHash::digestForIndex($name);
			}

			$objects = $table->loadAllWhere('nameHash IN (%Ls)', $hashes);
			$map = mpull($objects, 'getID', 'getName');

			$need = array();
			foreach ($names as $name) {
			if (isset($map[$name])) {
			continue;
			}
			$need[$name] = $name;
			}

			foreach ($need as $name) {
			$object = id(clone $table)
			->setName($name)
			->save();
			$map[$name] = $object->getID();
			}

			return $map;
			}

			private function addServiceEvents() {
			$events = PhutilServiceProfiler::getInstance()->getServiceCallLog();
			foreach ($events as $event) {
			$type = idx($event, 'type');
			switch ($type) {
			case 'exec':
			$this->newEvent(
			MultimeterEvent::TYPE_EXEC_TIME,
			$label = $this->getLabelForCommandEvent($event['command']),
			(1000000 * $event['duration']));
			break;
			}
			}
			}

			private function getLabelForCommandEvent($command) {
			$argv = preg_split('/\s+/', $command);

			$bin = array_shift($argv);
			$bin = basename($bin);
			$bin = trim($bin, '"\'');

			// It's important to avoid leaking details about command parameters,
			// because some may be sensitive. Given this, it's not trivial to
			// determine which parts of a command are arguments and which parts are
			// flags.

			// Rather than try too hard for now, just whitelist some workflows that we
			// know about and record everything else generically. Overall, this will
			// produce labels like "pygmentize" or "git log", discarding all flags and
			// arguments.

			$workflows = array(
			'git' => array(
			'log' => true,
			'for-each-ref' => true,
			'pull' => true,
			'clone' => true,
			'fetch' => true,
			'cat-file' => true,
			'init' => true,
			'config' => true,
			'remote' => true,
			'rev-parse' => true,
			'diff' => true,
			'ls-tree' => true,
			),
			'svn' => array(
			'log' => true,
			'diff' => true,
			),
			'hg' => array(
			'log' => true,
			'locate' => true,
			'pull' => true,
			'clone' => true,
			'init' => true,
			'diff' => true,
			'cat' => true,
			'files' => true,
			),
			'svnadmin' => array(
			'create' => true,
			),
			);

			$workflow = null;
			$candidates = idx($workflows, $bin);
			if ($candidates) {
			foreach ($argv as $arg) {
			if (isset($candidates[$arg])) {
			$workflow = $arg;
			break;
			}
			}
			}

			if ($workflow) {
			return 'bin.'.$bin.' '.$workflow;
			} else {
			return 'bin.'.$bin;
			}
			}

			}

phab/src/applications/multimeter/data/MultimeterControl.php064d9a9bfd62production

MultimeterControl.phpView Options

phab/src/applications/multimeter/data/MultimeterControl.php
064d9a9bfd62production

MultimeterControl.php
View Options