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DrydockLease.php
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Wed, Apr 9, 10:12

DrydockLease.php
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<?php
final class DrydockLease extends DrydockDAO
implements PhabricatorPolicyInterface {
protected $resourcePHID;
protected $resourceType;
protected $until;
protected $ownerPHID;
protected $attributes = array();
protected $status = DrydockLeaseStatus::STATUS_PENDING;
private $resource = self::ATTACHABLE;
private $releaseOnDestruction;
private $isAcquired = false;
private $isActivated = false;
private $activateWhenAcquired = false;
private $slotLocks = array();
/**
* 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 releaseOnDestruction() {
$this->releaseOnDestruction = true;
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 getLeaseName() {
return pht('Lease %d', $this->getID());
}
protected function getConfiguration() {
return array(
self::CONFIG_AUX_PHID => true,
self::CONFIG_SERIALIZATION => array(
'attributes' => self::SERIALIZATION_JSON,
),
self::CONFIG_COLUMN_SCHEMA => array(
'status' => 'uint32',
'until' => 'epoch?',
'resourceType' => 'text128',
'ownerPHID' => 'phid?',
'resourcePHID' => 'phid?',
),
self::CONFIG_KEY_SCHEMA => array(
'key_resource' => array(
'columns' => array('resourcePHID', 'status'),
),
),
) + parent::getConfiguration();
}
public function setAttribute($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 queueForActivation() {
if ($this->getID()) {
throw new Exception(
pht('Only new leases may be queued for activation!'));
}
$this
->setStatus(DrydockLeaseStatus::STATUS_PENDING)
->save();
$task = PhabricatorWorker::scheduleTask(
'DrydockAllocatorWorker',
array(
'leasePHID' => $this->getPHID(),
),
array(
'objectPHID' => $this->getPHID(),
));
return $this;
}
public function isActive() {
switch ($this->status) {
case DrydockLeaseStatus::STATUS_ACQUIRED:
case DrydockLeaseStatus::STATUS_ACTIVE:
return true;
}
return false;
}
private function assertActive() {
if (!$this->isActive()) {
throw new Exception(
pht(
'Lease is not active! You can not interact with resources through '.
'an inactive lease.'));
}
}
public function waitUntilActive() {
while (true) {
$lease = $this->reload();
if (!$lease) {
throw new Exception(pht('Failed to reload lease.'));
}
$status = $lease->getStatus();
switch ($status) {
case DrydockLeaseStatus::STATUS_ACTIVE:
return;
case DrydockLeaseStatus::STATUS_RELEASED:
throw new Exception(pht('Lease has already been released!'));
case DrydockLeaseStatus::STATUS_DESTROYED:
throw new Exception(pht('Lease has already been destroyed!'));
case DrydockLeaseStatus::STATUS_BROKEN:
throw new Exception(pht('Lease has been broken!'));
case DrydockLeaseStatus::STATUS_PENDING:
case DrydockLeaseStatus::STATUS_ACQUIRED:
break;
default:
throw new Exception(
pht(
'Lease has unknown status "%s".',
$status));
}
sleep(1);
}
}
public function setActivateWhenAcquired($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.'));
}
}
$this->openTransaction();
$this
->setResourcePHID($resource->getPHID())
->setStatus($new_status)
->save();
DrydockSlotLock::acquireLocks($this->getPHID(), $this->slotLocks);
$this->slotLocks = array();
$this->saveTransaction();
$this->isAcquired = true;
if ($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();
$this
->setStatus(DrydockLeaseStatus::STATUS_ACTIVE)
->save();
DrydockSlotLock::acquireLocks($this->getPHID(), $this->slotLocks);
$this->slotLocks = array();
$this->saveTransaction();
$this->isActivated = true;
$this->didActivate();
return $this;
}
public function isActivatedLease() {
return $this->isActivated;
}
public function canRelease() {
if (!$this->getID()) {
return false;
}
switch ($this->getStatus()) {
case DrydockLeaseStatus::STATUS_RELEASED:
case DrydockLeaseStatus::STATUS_DESTROYED:
return false;
default:
return true;
}
}
public function scheduleUpdate($epoch = null) {
PhabricatorWorker::scheduleTask(
'DrydockLeaseUpdateWorker',
array(
'leasePHID' => $this->getPHID(),
'isExpireTask' => ($epoch !== null),
),
array(
'objectPHID' => $this->getPHID(),
'delayUntil' => $epoch,
));
}
private function didActivate() {
$viewer = PhabricatorUser::getOmnipotentUser();
$need_update = false;
$commands = id(new DrydockCommandQuery())
->setViewer($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);
}
}
/* -( 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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