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PhabricatorWorkerActiveTask.php
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Thu, May 9, 02:19

PhabricatorWorkerActiveTask.php
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<?php
final class PhabricatorWorkerActiveTask extends PhabricatorWorkerTask {
protected $failureTime;
private $serverTime;
private $localTime;
public function getConfiguration() {
return array(
self::CONFIG_IDS => self::IDS_COUNTER,
self::CONFIG_TIMESTAMPS => false,
) + parent::getConfiguration();
}
public function setServerTime($server_time) {
$this->serverTime = $server_time;
$this->localTime = time();
return $this;
}
public function setLeaseDuration($lease_duration) {
$this->checkLease();
$server_lease_expires = $this->serverTime + $lease_duration;
$this->setLeaseExpires($server_lease_expires);
// NOTE: This is primarily to allow unit tests to set negative lease
// durations so they don't have to wait around for leases to expire. We
// check that the lease is valid above.
return $this->forceSaveWithoutLease();
}
public function save() {
$this->checkLease();
return $this->forceSaveWithoutLease();
}
public function forceSaveWithoutLease() {
$is_new = !$this->getID();
if ($is_new) {
$this->failureCount = 0;
}
if ($is_new && ($this->getData() !== null)) {
$data = new PhabricatorWorkerTaskData();
$data->setData($this->getData());
$data->save();
$this->setDataID($data->getID());
}
return parent::save();
}
protected function checkLease() {
if ($this->leaseOwner) {
$current_server_time = $this->serverTime + (time() - $this->localTime);
if ($current_server_time >= $this->leaseExpires) {
$id = $this->getID();
$class = $this->getTaskClass();
throw new Exception(
"Trying to update Task {$id} ({$class}) after lease expiration!");
}
}
}
public function delete() {
throw new Exception(
'Active tasks can not be deleted directly. '.
'Use archiveTask() to move tasks to the archive.');
}
public function archiveTask($result, $duration) {
if ($this->getID() === null) {
throw new Exception(
"Attempting to archive a task which hasn't been save()d!");
}
$this->checkLease();
$archive = id(new PhabricatorWorkerArchiveTask())
->setID($this->getID())
->setTaskClass($this->getTaskClass())
->setLeaseOwner($this->getLeaseOwner())
->setLeaseExpires($this->getLeaseExpires())
->setFailureCount($this->getFailureCount())
->setDataID($this->getDataID())
->setResult($result)
->setDuration($duration);
// NOTE: This deletes the active task (this object)!
$archive->save();
return $archive;
}
public function executeTask() {
// We do this outside of the try .. catch because we don't have permission
// to release the lease otherwise.
$this->checkLease();
$did_succeed = false;
try {
$worker = $this->getWorkerInstance();
$maximum_failures = $worker->getMaximumRetryCount();
if ($maximum_failures !== null) {
if ($this->getFailureCount() > $maximum_failures) {
$id = $this->getID();
throw new PhabricatorWorkerPermanentFailureException(
"Task {$id} has exceeded the maximum number of failures ".
"({$maximum_failures}).");
}
}
$lease = $worker->getRequiredLeaseTime();
if ($lease !== null) {
$this->setLeaseDuration($lease);
}
$t_start = microtime(true);
$worker->executeTask();
$t_end = microtime(true);
$duration = (int)(1000000 * ($t_end - $t_start));
$result = $this->archiveTask(
PhabricatorWorkerArchiveTask::RESULT_SUCCESS,
$duration);
$did_succeed = true;
} catch (PhabricatorWorkerPermanentFailureException $ex) {
$result = $this->archiveTask(
PhabricatorWorkerArchiveTask::RESULT_FAILURE,
0);
$result->setExecutionException($ex);
} catch (PhabricatorWorkerYieldException $ex) {
$this->setExecutionException($ex);
$retry = $ex->getDuration();
$retry = max($retry, 5);
// NOTE: As a side effect, this saves the object.
$this->setLeaseDuration($retry);
$result = $this;
} catch (Exception $ex) {
$this->setExecutionException($ex);
$this->setFailureCount($this->getFailureCount() + 1);
$this->setFailureTime(time());
$retry = $worker->getWaitBeforeRetry($this);
$retry = coalesce(
$retry,
PhabricatorWorkerLeaseQuery::getDefaultWaitBeforeRetry());
// NOTE: As a side effect, this saves the object.
$this->setLeaseDuration($retry);
$result = $this;
}
// NOTE: If this throws, we don't want it to cause the task to fail again,
// so execute it out here and just let the exception escape.
if ($did_succeed) {
foreach ($worker->getQueuedTasks() as $task) {
list($class, $data) = $task;
PhabricatorWorker::scheduleTask($class, $data);
}
}
return $result;
}
}

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