DrydockLease.php
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Created: Thu, Jul 3, 02:48

DrydockLease.php
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	<?php

	final class DrydockLease extends DrydockDAO
	implements PhabricatorPolicyInterface {

	protected $resourcePHID;
	protected $resourceType;
	protected $until;
	protected $ownerPHID;
	protected $authorizingPHID;
	protected $attributes = array();
	protected $status = DrydockLeaseStatus::STATUS_PENDING;
	protected $acquiredEpoch;
	protected $activatedEpoch;

	private $resource = self::ATTACHABLE;
	private $unconsumedCommands = self::ATTACHABLE;

	private $releaseOnDestruction;
	private $isAcquired = false;
	private $isActivated = false;
	private $activateWhenAcquired = false;
	private $slotLocks = array();

	public static function initializeNewLease() {
	$lease = new DrydockLease();

	// Pregenerate a PHID so that the caller can set something up to release
	// this lease before queueing it for activation.
	$lease->setPHID($lease->generatePHID());

	return $lease;
	}

	/**
	* Flag this lease to be released when its destructor is called. This is
	* mostly useful if you have a script which acquires, uses, and then releases
	* a lease, as you don't need to explicitly handle exceptions to properly
	* release the lease.
	*/
	public function setReleaseOnDestruction($release) {
	$this->releaseOnDestruction = $release;
	return $this;
	}

	public function __destruct() {
	if (!$this->releaseOnDestruction) {
	return;
	}

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

	$actor = PhabricatorUser::getOmnipotentUser();
	$drydock_phid = id(new PhabricatorDrydockApplication())->getPHID();

	$command = DrydockCommand::initializeNewCommand($actor)
	->setTargetPHID($this->getPHID())
	->setAuthorPHID($drydock_phid)
	->setCommand(DrydockCommand::COMMAND_RELEASE)
	->save();

	$this->scheduleUpdate();
	}

	public function setStatus($status) {
	if ($status == DrydockLeaseStatus::STATUS_ACQUIRED) {
	if (!$this->getAcquiredEpoch()) {
	$this->setAcquiredEpoch(PhabricatorTime::getNow());
	}
	}

	if ($status == DrydockLeaseStatus::STATUS_ACTIVE) {
	if (!$this->getActivatedEpoch()) {
	$this->setActivatedEpoch(PhabricatorTime::getNow());
	}
	}

	return parent::setStatus($status);
	}

	public function getLeaseName() {
	return pht('Lease %d', $this->getID());
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_SERIALIZATION => array(
	'attributes' => self::SERIALIZATION_JSON,
	),
	self::CONFIG_COLUMN_SCHEMA => array(
	'status' => 'text32',
	'until' => 'epoch?',
	'resourceType' => 'text128',
	'ownerPHID' => 'phid?',
	'resourcePHID' => 'phid?',
	'acquiredEpoch' => 'epoch?',
	'activatedEpoch' => 'epoch?',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_resource' => array(
	'columns' => array('resourcePHID', 'status'),
	),
	'key_status' => array(
	'columns' => array('status'),
	),
	),
	) + parent::getConfiguration();
	}

	public function setAttribute($key, $value) {
	$this->attributes[$key] = $value;
	return $this;
	}

	public function getAttribute($key, $default = null) {
	return idx($this->attributes, $key, $default);
	}

	public function generatePHID() {
	return PhabricatorPHID::generateNewPHID(DrydockLeasePHIDType::TYPECONST);
	}

	public function getInterface($type) {
	return $this->getResource()->getInterface($this, $type);
	}

	public function getResource() {
	return $this->assertAttached($this->resource);
	}

	public function attachResource(DrydockResource $resource = null) {
	$this->resource = $resource;
	return $this;
	}

	public function hasAttachedResource() {
	return ($this->resource !== null);
	}

	public function getUnconsumedCommands() {
	return $this->assertAttached($this->unconsumedCommands);
	}

	public function attachUnconsumedCommands(array $commands) {
	$this->unconsumedCommands = $commands;
	return $this;
	}

	public function isReleasing() {
	foreach ($this->getUnconsumedCommands() as $command) {
	if ($command->getCommand() == DrydockCommand::COMMAND_RELEASE) {
	return true;
	}
	}

	return false;
	}

	public function queueForActivation() {
	if ($this->getID()) {
	throw new Exception(
	pht('Only new leases may be queued for activation!'));
	}

	if (!$this->getAuthorizingPHID()) {
	throw new Exception(
	pht(
	'Trying to queue a lease for activation without an authorizing '.
	'object. Use "%s" to specify the PHID of the authorizing object. '.
	'The authorizing object must be approved to use the allowed '.
	'blueprints.',
	'setAuthorizingPHID()'));
	}

	if (!$this->getAllowedBlueprintPHIDs()) {
	throw new Exception(
	pht(
	'Trying to queue a lease for activation without any allowed '.
	'Blueprints. Use "%s" to specify allowed blueprints. The '.
	'authorizing object must be approved to use the allowed blueprints.',
	'setAllowedBlueprintPHIDs()'));
	}

	$this
	->setStatus(DrydockLeaseStatus::STATUS_PENDING)
	->save();

	$this->scheduleUpdate();

	$this->logEvent(DrydockLeaseQueuedLogType::LOGCONST);

	return $this;
	}

	public function setActivateWhenAcquired($activate) {
	$this->activateWhenAcquired = true;
	return $this;
	}

	public function needSlotLock($key) {
	$this->slotLocks[] = $key;
	return $this;
	}

	public function acquireOnResource(DrydockResource $resource) {
	$expect_status = DrydockLeaseStatus::STATUS_PENDING;
	$actual_status = $this->getStatus();
	if ($actual_status != $expect_status) {
	throw new Exception(
	pht(
	'Trying to acquire a lease on a resource which is in the wrong '.
	'state: status must be "%s", actually "%s".',
	$expect_status,
	$actual_status));
	}

	if ($this->activateWhenAcquired) {
	$new_status = DrydockLeaseStatus::STATUS_ACTIVE;
	} else {
	$new_status = DrydockLeaseStatus::STATUS_ACQUIRED;
	}

	if ($new_status == DrydockLeaseStatus::STATUS_ACTIVE) {
	if ($resource->getStatus() == DrydockResourceStatus::STATUS_PENDING) {
	throw new Exception(
	pht(
	'Trying to acquire an active lease on a pending resource. '.
	'You can not immediately activate leases on resources which '.
	'need time to start up.'));
	}
	}

	// Before we associate the lease with the resource, we lock the resource
	// and reload it to make sure it is still pending or active. If we don't
	// do this, the resource may have just been reclaimed. (Once we acquire
	// the resource that stops it from being released, so we're nearly safe.)

	$resource_phid = $resource->getPHID();
	$hash = PhabricatorHash::digestForIndex($resource_phid);
	$lock_key = 'drydock.resource:'.$hash;
	$lock = PhabricatorGlobalLock::newLock($lock_key);

	try {
	$lock->lock(15);
	} catch (Exception $ex) {
	throw new DrydockResourceLockException(
	pht(
	'Failed to acquire lock for resource ("%s") while trying to '.
	'acquire lease ("%s").',
	$resource->getPHID(),
	$this->getPHID()));
	}

	$resource->reload();

	if (($resource->getStatus() !== DrydockResourceStatus::STATUS_ACTIVE) &&
	($resource->getStatus() !== DrydockResourceStatus::STATUS_PENDING)) {
	throw new DrydockAcquiredBrokenResourceException(
	pht(
	'Trying to acquire lease ("%s") on a resource ("%s") in the '.
	'wrong status ("%s").',
	$this->getPHID(),
	$resource->getPHID(),
	$resource->getStatus()));
	}

	$caught = null;
	try {
	$this->openTransaction();

	try {
	DrydockSlotLock::acquireLocks($this->getPHID(), $this->slotLocks);
	$this->slotLocks = array();
	} catch (DrydockSlotLockException $ex) {
	$this->killTransaction();

	$this->logEvent(
	DrydockSlotLockFailureLogType::LOGCONST,
	array(
	'locks' => $ex->getLockMap(),
	));

	throw $ex;
	}

	$this
	->setResourcePHID($resource->getPHID())
	->attachResource($resource)
	->setStatus($new_status)
	->save();

	$this->saveTransaction();
	} catch (Exception $ex) {
	$caught = $ex;
	}

	$lock->unlock();

	if ($caught) {
	throw $caught;
	}

	$this->isAcquired = true;

	$this->logEvent(DrydockLeaseAcquiredLogType::LOGCONST);

	if ($new_status == DrydockLeaseStatus::STATUS_ACTIVE) {
	$this->didActivate();
	}

	return $this;
	}

	public function isAcquiredLease() {
	return $this->isAcquired;
	}

	public function activateOnResource(DrydockResource $resource) {
	$expect_status = DrydockLeaseStatus::STATUS_ACQUIRED;
	$actual_status = $this->getStatus();
	if ($actual_status != $expect_status) {
	throw new Exception(
	pht(
	'Trying to activate a lease which has the wrong status: status '.
	'must be "%s", actually "%s".',
	$expect_status,
	$actual_status));
	}

	if ($resource->getStatus() == DrydockResourceStatus::STATUS_PENDING) {
	// TODO: Be stricter about this?
	throw new Exception(
	pht(
	'Trying to activate a lease on a pending resource.'));
	}

	$this->openTransaction();

	try {
	DrydockSlotLock::acquireLocks($this->getPHID(), $this->slotLocks);
	$this->slotLocks = array();
	} catch (DrydockSlotLockException $ex) {
	$this->killTransaction();

	$this->logEvent(
	DrydockSlotLockFailureLogType::LOGCONST,
	array(
	'locks' => $ex->getLockMap(),
	));

	throw $ex;
	}

	$this
	->setStatus(DrydockLeaseStatus::STATUS_ACTIVE)
	->save();

	$this->saveTransaction();

	$this->isActivated = true;

	$this->didActivate();

	return $this;
	}

	public function isActivatedLease() {
	return $this->isActivated;
	}

	public function scheduleUpdate($epoch = null) {
	PhabricatorWorker::scheduleTask(
	'DrydockLeaseUpdateWorker',
	array(
	'leasePHID' => $this->getPHID(),
	'isExpireTask' => ($epoch !== null),
	),
	array(
	'objectPHID' => $this->getPHID(),
	'delayUntil' => ($epoch ? (int)$epoch : null),
	));
	}

	public function setAwakenTaskIDs(array $ids) {
	$this->setAttribute('internal.awakenTaskIDs', $ids);
	return $this;
	}

	public function setAllowedBlueprintPHIDs(array $phids) {
	$this->setAttribute('internal.blueprintPHIDs', $phids);
	return $this;
	}

	public function getAllowedBlueprintPHIDs() {
	return $this->getAttribute('internal.blueprintPHIDs', array());
	}

	private function didActivate() {
	$viewer = PhabricatorUser::getOmnipotentUser();
	$need_update = false;

	$this->logEvent(DrydockLeaseActivatedLogType::LOGCONST);

	$commands = id(new DrydockCommandQuery())
	->setViewer($viewer)
	->withTargetPHIDs(array($this->getPHID()))
	->withConsumed(false)
	->execute();
	if ($commands) {
	$need_update = true;
	}

	if ($need_update) {
	$this->scheduleUpdate();
	}

	$expires = $this->getUntil();
	if ($expires) {
	$this->scheduleUpdate($expires);
	}

	$this->awakenTasks();
	}

	public function logEvent($type, array $data = array()) {
	$log = id(new DrydockLog())
	->setEpoch(PhabricatorTime::getNow())
	->setType($type)
	->setData($data);

	$log->setLeasePHID($this->getPHID());

	$resource_phid = $this->getResourcePHID();
	if ($resource_phid) {
	$resource = $this->getResource();

	$log->setResourcePHID($resource->getPHID());
	$log->setBlueprintPHID($resource->getBlueprintPHID());
	}

	return $log->save();
	}

	/**
	* Awaken yielded tasks after a state change.
	*
	* @return this
	*/
	public function awakenTasks() {
	$awaken_ids = $this->getAttribute('internal.awakenTaskIDs');
	if (is_array($awaken_ids) && $awaken_ids) {
	PhabricatorWorker::awakenTaskIDs($awaken_ids);
	}

	return $this;
	}

	public function getURI() {
	$id = $this->getID();
	return "/drydock/lease/{$id}/";
	}


	/* -( Status )------------------------------------------------------------- */


	public function getStatusObject() {
	return DrydockLeaseStatus::newStatusObject($this->getStatus());
	}

	public function getStatusIcon() {
	return $this->getStatusObject()->getIcon();
	}

	public function getStatusColor() {
	return $this->getStatusObject()->getColor();
	}

	public function getStatusDisplayName() {
	return $this->getStatusObject()->getDisplayName();
	}

	public function isActivating() {
	return $this->getStatusObject()->isActivating();
	}

	public function isActive() {
	return $this->getStatusObject()->isActive();
	}

	public function canRelease() {
	if (!$this->getID()) {
	return false;
	}

	return $this->getStatusObject()->canRelease();
	}

	public function canReceiveCommands() {
	return $this->getStatusObject()->canReceiveCommands();
	}


	/* -( PhabricatorPolicyInterface )----------------------------------------- */


	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	if ($this->getResource()) {
	return $this->getResource()->getPolicy($capability);
	}

	// TODO: Implement reasonable policies.

	return PhabricatorPolicies::getMostOpenPolicy();
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	if ($this->getResource()) {
	return $this->getResource()->hasAutomaticCapability($capability, $viewer);
	}
	return false;
	}

	public function describeAutomaticCapability($capability) {
	return pht('Leases inherit policies from the resources they lease.');
	}

	}

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