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DrydockLease.php
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Mon, Nov 25, 15:01

DrydockLease.php
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<?php
final class DrydockLease extends DrydockDAO
implements PhabricatorPolicyInterface {
protected $resourceID;
protected $resourceType;
protected $until;
protected $ownerPHID;
protected $attributes = array();
protected $status = DrydockLeaseStatus::STATUS_PENDING;
protected $taskID;
private $resource = self::ATTACHABLE;
private $releaseOnDestruction;
/**
* 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) {
if ($this->isActive()) {
$this->release();
}
}
}
public function getLeaseName() {
return pht('Lease %d', $this->getID());
}
protected function getConfiguration() {
return array(
self::CONFIG_AUX_PHID => true,
self::CONFIG_SERIALIZATION => array(
'attributes' => self::SERIALIZATION_JSON,
),
self::CONFIG_COLUMN_SCHEMA => array(
'status' => 'uint32',
'until' => 'epoch?',
'resourceType' => 'text128',
'taskID' => 'id?',
'ownerPHID' => 'phid?',
'resourceID' => 'id?',
),
self::CONFIG_KEY_SCHEMA => array(
'key_phid' => null,
'phid' => array(
'columns' => array('phid'),
'unique' => true,
),
),
) + parent::getConfiguration();
}
public function setAttribute($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 loadResource() {
return id(new DrydockResource())->loadOneWhere(
'id = %d',
$this->getResourceID());
}
public function queueForActivation() {
if ($this->getID()) {
throw new Exception(
pht('Only new leases may be queued for activation!'));
}
$this->setStatus(DrydockLeaseStatus::STATUS_PENDING);
$this->save();
$task = PhabricatorWorker::scheduleTask(
'DrydockAllocatorWorker',
$this->getID());
// NOTE: Scheduling the task might execute it in-process, if we're running
// from a CLI script. Reload the lease to make sure we have the most
// up-to-date information. Normally, this has no effect.
$this->reload();
$this->setTaskID($task->getID());
$this->save();
return $this;
}
public function release() {
$this->assertActive();
$this->setStatus(DrydockLeaseStatus::STATUS_RELEASED);
$this->save();
$this->resource = null;
return $this;
}
public function isActive() {
switch ($this->status) {
case DrydockLeaseStatus::STATUS_ACTIVE:
case DrydockLeaseStatus::STATUS_ACQUIRING:
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 static function waitForLeases(array $leases) {
assert_instances_of($leases, __CLASS__);
$task_ids = array_filter(mpull($leases, 'getTaskID'));
PhabricatorWorker::waitForTasks($task_ids);
$unresolved = $leases;
while (true) {
foreach ($unresolved as $key => $lease) {
$lease->reload();
switch ($lease->getStatus()) {
case DrydockLeaseStatus::STATUS_ACTIVE:
unset($unresolved[$key]);
break;
case DrydockLeaseStatus::STATUS_RELEASED:
throw new Exception(pht('Lease has already been released!'));
case DrydockLeaseStatus::STATUS_EXPIRED:
throw new Exception(pht('Lease has already expired!'));
case DrydockLeaseStatus::STATUS_BROKEN:
throw new Exception(pht('Lease has been broken!'));
case DrydockLeaseStatus::STATUS_PENDING:
case DrydockLeaseStatus::STATUS_ACQUIRING:
break;
default:
throw new Exception(pht('Unknown status??'));
}
}
if ($unresolved) {
sleep(1);
} else {
break;
}
}
foreach ($leases as $lease) {
$lease->attachResource($lease->loadResource());
}
}
public function waitUntilActive() {
if (!$this->getID()) {
$this->queueForActivation();
}
self::waitForLeases(array($this));
return $this;
}
/* -( PhabricatorPolicyInterface )----------------------------------------- */
public function getCapabilities() {
return array(
PhabricatorPolicyCapability::CAN_VIEW,
);
}
public function getPolicy($capability) {
if ($this->getResource()) {
return $this->getResource()->getPolicy($capability);
}
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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