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DrydockLeaseUpdateWorker.php
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DrydockLeaseUpdateWorker.php
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			<?php

			/**
			* @task update Updating Leases
			* @task command Processing Commands
			* @task allocator Drydock Allocator
			* @task acquire Acquiring Leases
			* @task activate Activating Leases
			* @task release Releasing Leases
			* @task break Breaking Leases
			* @task destroy Destroying Leases
			*/
			final class DrydockLeaseUpdateWorker extends DrydockWorker {

			protected function doWork() {
			$lease_phid = $this->getTaskDataValue('leasePHID');

			$hash = PhabricatorHash::digestForIndex($lease_phid);
			$lock_key = 'drydock.lease:'.$hash;

			$lock = PhabricatorGlobalLock::newLock($lock_key)
			->lock(1);

			try {
			$lease = $this->loadLease($lease_phid);
			$this->handleUpdate($lease);
			} catch (Exception $ex) {
			$lock->unlock();
			$this->flushDrydockTaskQueue();
			throw $ex;
			}

			$lock->unlock();
			}


			/* -( Updating Leases )---------------------------------------------------- */


			/**
			* @task update
			*/
			private function handleUpdate(DrydockLease $lease) {
			try {
			$this->updateLease($lease);
			} catch (Exception $ex) {
			if ($this->isTemporaryException($ex)) {
			$this->yieldLease($lease, $ex);
			} else {
			$this->breakLease($lease, $ex);
			}
			}
			}


			/**
			* @task update
			*/
			private function updateLease(DrydockLease $lease) {
			$this->processLeaseCommands($lease);

			$lease_status = $lease->getStatus();
			switch ($lease_status) {
			case DrydockLeaseStatus::STATUS_PENDING:
			$this->executeAllocator($lease);
			break;
			case DrydockLeaseStatus::STATUS_ACQUIRED:
			$this->activateLease($lease);
			break;
			case DrydockLeaseStatus::STATUS_ACTIVE:
			// Nothing to do.
			break;
			case DrydockLeaseStatus::STATUS_RELEASED:
			case DrydockLeaseStatus::STATUS_BROKEN:
			$this->destroyLease($lease);
			break;
			case DrydockLeaseStatus::STATUS_DESTROYED:
			break;
			}

			$this->yieldIfExpiringLease($lease);
			}


			/**
			* @task update
			*/
			private function yieldLease(DrydockLease $lease, Exception $ex) {
			$duration = $this->getYieldDurationFromException($ex);

			$lease->logEvent(
			DrydockLeaseActivationYieldLogType::LOGCONST,
			array(
			'duration' => $duration,
			));

			throw new PhabricatorWorkerYieldException($duration);
			}


			/* -( Processing Commands )------------------------------------------------ */


			/**
			* @task command
			*/
			private function processLeaseCommands(DrydockLease $lease) {
			if (!$lease->canReceiveCommands()) {
			return;
			}

			$this->checkLeaseExpiration($lease);

			$commands = $this->loadCommands($lease->getPHID());
			foreach ($commands as $command) {
			if (!$lease->canReceiveCommands()) {
			break;
			}

			$this->processLeaseCommand($lease, $command);

			$command
			->setIsConsumed(true)
			->save();
			}
			}


			/**
			* @task command
			*/
			private function processLeaseCommand(
			DrydockLease $lease,
			DrydockCommand $command) {
			switch ($command->getCommand()) {
			case DrydockCommand::COMMAND_RELEASE:
			$this->releaseLease($lease);
			break;
			}
			}


			/* -( Drydock Allocator )-------------------------------------------------- */


			/**
			* Find or build a resource which can satisfy a given lease request, then
			* acquire the lease.
			*
			* @param DrydockLease Requested lease.
			* @return void
			* @task allocator
			*/
			private function executeAllocator(DrydockLease $lease) {
			$blueprints = $this->loadBlueprintsForAllocatingLease($lease);

			// If we get nothing back, that means no blueprint is defined which can
			// ever build the requested resource. This is a permanent failure, since
			// we don't expect to succeed no matter how many times we try.
			if (!$blueprints) {
			throw new PhabricatorWorkerPermanentFailureException(
			pht(
			'No active Drydock blueprint exists which can ever allocate a '.
			'resource for lease "%s".',
			$lease->getPHID()));
			}

			// First, try to find a suitable open resource which we can acquire a new
			// lease on.
			$resources = $this->loadResourcesForAllocatingLease($blueprints, $lease);

			// If no resources exist yet, see if we can build one.
			if (!$resources) {
			$usable_blueprints = $this->removeOverallocatedBlueprints(
			$blueprints,
			$lease);

			// If we get nothing back here, some blueprint claims it can eventually
			// satisfy the lease, just not right now. This is a temporary failure,
			// and we expect allocation to succeed eventually.
			if (!$usable_blueprints) {
			$blueprints = $this->rankBlueprints($blueprints, $lease);

			// Try to actively reclaim unused resources. If we succeed, jump back
			// into the queue in an effort to claim it.
			foreach ($blueprints as $blueprint) {
			$reclaimed = $this->reclaimResources($blueprint, $lease);
			if ($reclaimed) {
			$lease->logEvent(
			DrydockLeaseReclaimLogType::LOGCONST,
			array(
			'resourcePHIDs' => array($reclaimed->getPHID()),
			));

			throw new PhabricatorWorkerYieldException(15);
			}
			}

			$lease->logEvent(
			DrydockLeaseWaitingForResourcesLogType::LOGCONST,
			array(
			'blueprintPHIDs' => mpull($blueprints, 'getPHID'),
			));

			throw new PhabricatorWorkerYieldException(15);
			}

			$usable_blueprints = $this->rankBlueprints($usable_blueprints, $lease);

			$exceptions = array();
			foreach ($usable_blueprints as $blueprint) {
			try {
			$resources[] = $this->allocateResource($blueprint, $lease);

			// Bail after allocating one resource, we don't need any more than
			// this.
			break;
			} catch (Exception $ex) {
			$exceptions[] = $ex;
			}
			}

			if (!$resources) {
			throw new PhutilAggregateException(
			pht(
			'All blueprints failed to allocate a suitable new resource when '.
			'trying to allocate lease "%s".',
			$lease->getPHID()),
			$exceptions);
			}

			$resources = $this->removeUnacquirableResources($resources, $lease);
			if (!$resources) {
			// If we make it here, we just built a resource but aren't allowed
			// to acquire it. We expect this during routine operation if the
			// resource prevents acquisition until it activates. Yield and wait
			// for activation.
			throw new PhabricatorWorkerYieldException(15);
			}

			// NOTE: We have not acquired the lease yet, so it is possible that the
			// resource we just built will be snatched up by some other lease before
			// we can acquire it. This is not problematic: we'll retry a little later
			// and should suceed eventually.
			}

			$resources = $this->rankResources($resources, $lease);

			$exceptions = array();
			$allocated = false;
			foreach ($resources as $resource) {
			try {
			$this->acquireLease($resource, $lease);
			$allocated = true;
			break;
			} catch (Exception $ex) {
			$exceptions[] = $ex;
			}
			}

			if (!$allocated) {
			throw new PhutilAggregateException(
			pht(
			'Unable to acquire lease "%s" on any resouce.',
			$lease->getPHID()),
			$exceptions);
			}
			}


			/**
			* Get all the @{class:DrydockBlueprintImplementation}s which can possibly
			* build a resource to satisfy a lease.
			*
			* This method returns blueprints which might, at some time, be able to
			* build a resource which can satisfy the lease. They may not be able to
			* build that resource right now.
			*
			* @param DrydockLease Requested lease.
			* @return list<DrydockBlueprintImplementation> List of qualifying blueprint
			* implementations.
			* @task allocator
			*/
			private function loadBlueprintImplementationsForAllocatingLease(
			DrydockLease $lease) {

			$impls = DrydockBlueprintImplementation::getAllBlueprintImplementations();

			$keep = array();
			foreach ($impls as $key => $impl) {
			// Don't use disabled blueprint types.
			if (!$impl->isEnabled()) {
			continue;
			}

			// Don't use blueprint types which can't allocate the correct kind of
			// resource.
			if ($impl->getType() != $lease->getResourceType()) {
			continue;
			}

			if (!$impl->canAnyBlueprintEverAllocateResourceForLease($lease)) {
			continue;
			}

			$keep[$key] = $impl;
			}

			return $keep;
			}


			/**
			* Get all the concrete @{class:DrydockBlueprint}s which can possibly
			* build a resource to satisfy a lease.
			*
			* @param DrydockLease Requested lease.
			* @return list<DrydockBlueprint> List of qualifying blueprints.
			* @task allocator
			*/
			private function loadBlueprintsForAllocatingLease(
			DrydockLease $lease) {
			$viewer = $this->getViewer();

			$impls = $this->loadBlueprintImplementationsForAllocatingLease($lease);
			if (!$impls) {
			return array();
			}

			$blueprint_phids = $lease->getAllowedBlueprintPHIDs();
			if (!$blueprint_phids) {
			$lease->logEvent(DrydockLeaseNoBlueprintsLogType::LOGCONST);
			return array();
			}

			$query = id(new DrydockBlueprintQuery())
			->setViewer($viewer)
			->withPHIDs($blueprint_phids)
			->withBlueprintClasses(array_keys($impls))
			->withDisabled(false);

			// The Drydock application itself is allowed to authorize anything. This
			// is primarily used for leases generated by CLI administrative tools.
			$drydock_phid = id(new PhabricatorDrydockApplication())->getPHID();

			$authorizing_phid = $lease->getAuthorizingPHID();
			if ($authorizing_phid != $drydock_phid) {
			$blueprints = id(clone $query)
			->withAuthorizedPHIDs(array($authorizing_phid))
			->execute();
			if (!$blueprints) {
			// If we didn't hit any blueprints, check if this is an authorization
			// problem: re-execute the query without the authorization constraint.
			// If the second query hits blueprints, the overall configuration is
			// fine but this is an authorization problem. If the second query also
			// comes up blank, this is some other kind of configuration issue so
			// we fall through to the default pathway.
			$all_blueprints = $query->execute();
			if ($all_blueprints) {
			$lease->logEvent(
			DrydockLeaseNoAuthorizationsLogType::LOGCONST,
			array(
			'authorizingPHID' => $authorizing_phid,
			));
			return array();
			}
			}
			} else {
			$blueprints = $query->execute();
			}

			$keep = array();
			foreach ($blueprints as $key => $blueprint) {
			if (!$blueprint->canEverAllocateResourceForLease($lease)) {
			continue;
			}

			$keep[$key] = $blueprint;
			}

			return $keep;
			}


			/**
			* Load a list of all resources which a given lease can possibly be
			* allocated against.
			*
			* @param list<DrydockBlueprint> Blueprints which may produce suitable
			* resources.
			* @param DrydockLease Requested lease.
			* @return list<DrydockResource> Resources which may be able to allocate
			* the lease.
			* @task allocator
			*/
			private function loadResourcesForAllocatingLease(
			array $blueprints,
			DrydockLease $lease) {
			assert_instances_of($blueprints, 'DrydockBlueprint');
			$viewer = $this->getViewer();

			$resources = id(new DrydockResourceQuery())
			->setViewer($viewer)
			->withBlueprintPHIDs(mpull($blueprints, 'getPHID'))
			->withTypes(array($lease->getResourceType()))
			->withStatuses(
			array(
			DrydockResourceStatus::STATUS_PENDING,
			DrydockResourceStatus::STATUS_ACTIVE,
			))
			->execute();

			return $this->removeUnacquirableResources($resources, $lease);
			}


			/**
			* Remove resources which can not be acquired by a given lease from a list.
			*
			* @param list<DrydockResource> Candidate resources.
			* @param DrydockLease Acquiring lease.
			* @return list<DrydockResource> Resources which the lease may be able to
			* acquire.
			* @task allocator
			*/
			private function removeUnacquirableResources(
			array $resources,
			DrydockLease $lease) {
			$keep = array();
			foreach ($resources as $key => $resource) {
			$blueprint = $resource->getBlueprint();

			if (!$blueprint->canAcquireLeaseOnResource($resource, $lease)) {
			continue;
			}

			$keep[$key] = $resource;
			}

			return $keep;
			}


			/**
			* Remove blueprints which are too heavily allocated to build a resource for
			* a lease from a list of blueprints.
			*
			* @param list<DrydockBlueprint> List of blueprints.
			* @return list<DrydockBlueprint> List with blueprints that can not allocate
			* a resource for the lease right now removed.
			* @task allocator
			*/
			private function removeOverallocatedBlueprints(
			array $blueprints,
			DrydockLease $lease) {
			assert_instances_of($blueprints, 'DrydockBlueprint');

			$keep = array();

			foreach ($blueprints as $key => $blueprint) {
			if (!$blueprint->canAllocateResourceForLease($lease)) {
			continue;
			}

			$keep[$key] = $blueprint;
			}

			return $keep;
			}


			/**
			* Rank blueprints by suitability for building a new resource for a
			* particular lease.
			*
			* @param list<DrydockBlueprint> List of blueprints.
			* @param DrydockLease Requested lease.
			* @return list<DrydockBlueprint> Ranked list of blueprints.
			* @task allocator
			*/
			private function rankBlueprints(array $blueprints, DrydockLease $lease) {
			assert_instances_of($blueprints, 'DrydockBlueprint');

			// TODO: Implement improvements to this ranking algorithm if they become
			// available.
			shuffle($blueprints);

			return $blueprints;
			}


			/**
			* Rank resources by suitability for allocating a particular lease.
			*
			* @param list<DrydockResource> List of resources.
			* @param DrydockLease Requested lease.
			* @return list<DrydockResource> Ranked list of resources.
			* @task allocator
			*/
			private function rankResources(array $resources, DrydockLease $lease) {
			assert_instances_of($resources, 'DrydockResource');

			// TODO: Implement improvements to this ranking algorithm if they become
			// available.
			shuffle($resources);

			return $resources;
			}


			/**
			* Perform an actual resource allocation with a particular blueprint.
			*
			* @param DrydockBlueprint The blueprint to allocate a resource from.
			* @param DrydockLease Requested lease.
			* @return DrydockResource Allocated resource.
			* @task allocator
			*/
			private function allocateResource(
			DrydockBlueprint $blueprint,
			DrydockLease $lease) {
			$resource = $blueprint->allocateResource($lease);
			$this->validateAllocatedResource($blueprint, $resource, $lease);

			// If this resource was allocated as a pending resource, queue a task to
			// activate it.
			if ($resource->getStatus() == DrydockResourceStatus::STATUS_PENDING) {
			PhabricatorWorker::scheduleTask(
			'DrydockResourceUpdateWorker',
			array(
			'resourcePHID' => $resource->getPHID(),
			),
			array(
			'objectPHID' => $resource->getPHID(),
			));
			}

			return $resource;
			}


			/**
			* Check that the resource a blueprint allocated is roughly the sort of
			* object we expect.
			*
			* @param DrydockBlueprint Blueprint which built the resource.
			* @param wild Thing which the blueprint claims is a valid resource.
			* @param DrydockLease Lease the resource was allocated for.
			* @return void
			* @task allocator
			*/
			private function validateAllocatedResource(
			DrydockBlueprint $blueprint,
			$resource,
			DrydockLease $lease) {

			if (!($resource instanceof DrydockResource)) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: %s must '.
			'return an object of type %s or throw, but returned something else.',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			'allocateResource()',
			'DrydockResource'));
			}

			if (!$resource->isAllocatedResource()) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: %s '.
			'must actually allocate the resource it returns.',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			'allocateResource()'));
			}

			$resource_type = $resource->getType();
			$lease_type = $lease->getResourceType();

			if ($resource_type !== $lease_type) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: it '.
			'built a resource of type "%s" to satisfy a lease requesting a '.
			'resource of type "%s".',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			$resource_type,
			$lease_type));
			}
			}

			private function reclaimResources(
			DrydockBlueprint $blueprint,
			DrydockLease $lease) {
			$viewer = $this->getViewer();

			$resources = id(new DrydockResourceQuery())
			->setViewer($viewer)
			->withBlueprintPHIDs(array($blueprint->getPHID()))
			->withStatuses(
			array(
			DrydockResourceStatus::STATUS_ACTIVE,
			))
			->execute();

			// TODO: We could be much smarter about this and try to release long-unused
			// resources, resources with many similar copies, old resources, resources
			// that are cheap to rebuild, etc.
			shuffle($resources);

			foreach ($resources as $resource) {
			if ($this->canReclaimResource($resource)) {
			$this->reclaimResource($resource, $lease);
			return $resource;
			}
			}

			return null;
			}


			/* -( Acquiring Leases )--------------------------------------------------- */


			/**
			* Perform an actual lease acquisition on a particular resource.
			*
			* @param DrydockResource Resource to acquire a lease on.
			* @param DrydockLease Lease to acquire.
			* @return void
			* @task acquire
			*/
			private function acquireLease(
			DrydockResource $resource,
			DrydockLease $lease) {

			$blueprint = $resource->getBlueprint();
			$blueprint->acquireLease($resource, $lease);

			$this->validateAcquiredLease($blueprint, $resource, $lease);

			// If this lease has been acquired but not activated, queue a task to
			// activate it.
			if ($lease->getStatus() == DrydockLeaseStatus::STATUS_ACQUIRED) {
			$this->queueTask(
			__CLASS__,
			array(
			'leasePHID' => $lease->getPHID(),
			),
			array(
			'objectPHID' => $lease->getPHID(),
			));
			}
			}


			/**
			* Make sure that a lease was really acquired properly.
			*
			* @param DrydockBlueprint Blueprint which created the resource.
			* @param DrydockResource Resource which was acquired.
			* @param DrydockLease The lease which was supposedly acquired.
			* @return void
			* @task acquire
			*/
			private function validateAcquiredLease(
			DrydockBlueprint $blueprint,
			DrydockResource $resource,
			DrydockLease $lease) {

			if (!$lease->isAcquiredLease()) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: it '.
			'returned from "%s" without acquiring a lease.',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			'acquireLease()'));
			}

			$lease_phid = $lease->getResourcePHID();
			$resource_phid = $resource->getPHID();

			if ($lease_phid !== $resource_phid) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: it '.
			'returned from "%s" with a lease acquired on the wrong resource.',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			'acquireLease()'));
			}
			}


			/* -( Activating Leases )-------------------------------------------------- */


			/**
			* @task activate
			*/
			private function activateLease(DrydockLease $lease) {
			$resource = $lease->getResource();
			if (!$resource) {
			throw new Exception(
			pht('Trying to activate lease with no resource.'));
			}

			$resource_status = $resource->getStatus();

			if ($resource_status == DrydockResourceStatus::STATUS_PENDING) {
			throw new PhabricatorWorkerYieldException(15);
			}

			if ($resource_status != DrydockResourceStatus::STATUS_ACTIVE) {
			throw new Exception(
			pht(
			'Trying to activate lease on a dead resource (in status "%s").',
			$resource_status));
			}

			// NOTE: We can race resource destruction here. Between the time we
			// performed the read above and now, the resource might have closed, so
			// we may activate leases on dead resources. At least for now, this seems
			// fine: a resource dying right before we activate a lease on it should not
			// be distinguisahble from a resource dying right after we activate a lease
			// on it. We end up with an active lease on a dead resource either way, and
			// can not prevent resources dying from lightning strikes.

			$blueprint = $resource->getBlueprint();
			$blueprint->activateLease($resource, $lease);
			$this->validateActivatedLease($blueprint, $resource, $lease);
			}

			/**
			* @task activate
			*/
			private function validateActivatedLease(
			DrydockBlueprint $blueprint,
			DrydockResource $resource,
			DrydockLease $lease) {

			if (!$lease->isActivatedLease()) {
			throw new Exception(
			pht(
			'Blueprint "%s" (of type "%s") is not properly implemented: it '.
			'returned from "%s" without activating a lease.',
			$blueprint->getBlueprintName(),
			$blueprint->getClassName(),
			'acquireLease()'));
			}

			}


			/* -( Releasing Leases )--------------------------------------------------- */


			/**
			* @task release
			*/
			private function releaseLease(DrydockLease $lease) {
			$lease
			->setStatus(DrydockLeaseStatus::STATUS_RELEASED)
			->save();

			$lease->logEvent(DrydockLeaseReleasedLogType::LOGCONST);

			$resource = $lease->getResource();
			if ($resource) {
			$blueprint = $resource->getBlueprint();
			$blueprint->didReleaseLease($resource, $lease);
			}

			$this->destroyLease($lease);
			}


			/* -( Breaking Leases )---------------------------------------------------- */


			/**
			* @task break
			*/
			protected function breakLease(DrydockLease $lease, Exception $ex) {
			switch ($lease->getStatus()) {
			case DrydockLeaseStatus::STATUS_BROKEN:
			case DrydockLeaseStatus::STATUS_RELEASED:
			case DrydockLeaseStatus::STATUS_DESTROYED:
			throw new PhutilProxyException(
			pht(
			'Unexpected failure while destroying lease ("%s").',
			$lease->getPHID()),
			$ex);
			}

			$lease
			->setStatus(DrydockLeaseStatus::STATUS_BROKEN)
			->save();

			$lease->logEvent(
			DrydockLeaseActivationFailureLogType::LOGCONST,
			array(
			'class' => get_class($ex),
			'message' => $ex->getMessage(),
			));

			$lease->awakenTasks();

			$this->queueTask(
			__CLASS__,
			array(
			'leasePHID' => $lease->getPHID(),
			),
			array(
			'objectPHID' => $lease->getPHID(),
			));

			throw new PhabricatorWorkerPermanentFailureException(
			pht(
			'Permanent failure while activating lease ("%s"): %s',
			$lease->getPHID(),
			$ex->getMessage()));
			}


			/* -( Destroying Leases )-------------------------------------------------- */


			/**
			* @task destroy
			*/
			private function destroyLease(DrydockLease $lease) {
			$resource = $lease->getResource();

			if ($resource) {
			$blueprint = $resource->getBlueprint();
			$blueprint->destroyLease($resource, $lease);
			}

			DrydockSlotLock::releaseLocks($lease->getPHID());

			$lease
			->setStatus(DrydockLeaseStatus::STATUS_DESTROYED)
			->save();

			$lease->logEvent(DrydockLeaseDestroyedLogType::LOGCONST);

			$lease->awakenTasks();
			}

			}

phab/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php7168d8edd971production

DrydockLeaseUpdateWorker.phpView Options

phab/src/applications/drydock/worker/DrydockLeaseUpdateWorker.php
7168d8edd971production

DrydockLeaseUpdateWorker.php
View Options