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phorge/src/applications/drydock/worker/DrydockLeaseWorker.php
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DrydockLeaseWorker.php
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<?php
final class DrydockLeaseWorker extends DrydockWorker {
protected function doWork() {
$lease_phid = $this->getTaskDataValue('leasePHID');
$lease = $this->loadLease($lease_phid);
$this->activateLease($lease);
}
private function activateLease(DrydockLease $lease) {
$actual_status = $lease->getStatus();
if ($actual_status != DrydockLeaseStatus::STATUS_ACQUIRED) {
throw new PhabricatorWorkerPermanentFailureException(
pht(
'Trying to activate lease from wrong status ("%s").',
$actual_status));
}
$resource_id = $lease->getResourceID();
$resource = id(new DrydockResourceQuery())
->setViewer($this->getViewer())
->withIDs(array($resource_id))
->executeOne();
if (!$resource) {
throw new PhabricatorWorkerPermanentFailureException(
pht(
'Trying to activate lease on invalid resource ("%s").',
$resource_id));
}
$resource_status = $resource->getStatus();
if ($resource_status == DrydockResourceStatus::STATUS_PENDING) {
// TODO: This is explicitly a temporary failure -- we are waiting for
// the resource to come up.
throw new Exception(pht('Resource still activating.'));
}
if ($resource_status != DrydockResourceStatus::STATUS_OPEN) {
throw new PhabricatorWorkerPermanentFailureException(
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);
}
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()'));
}
}
}

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