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PhabricatorWorker.php
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Tue, Dec 24, 00:45

PhabricatorWorker.php
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<?php
/**
* @task config Configuring Retries and Failures
*
* @group worker
*/
abstract class PhabricatorWorker {
private $data;
/* -( Configuring Retries and Failures )----------------------------------- */
/**
* Return the number of seconds this worker needs hold a lease on the task for
* while it performs work. For most tasks you can leave this at `null`, which
* will give you a short default lease (currently 60 seconds).
*
* For tasks which may take a very long time to complete, you should return
* an upper bound on the amount of time the task may require.
*
* @return int|null Number of seconds this task needs to remain leased for,
* or null for a default (currently 60 second) lease.
*
* @task config
*/
public function getRequiredLeaseTime() {
return null;
}
/**
* Return the maximum number of times this task may be retried before it
* is considered permanently failed. By default, tasks retry indefinitely. You
* can throw a @{class:PhabricatorWorkerPermanentFailureException} to cause an
* immediate permanent failure.
*
* @return int|null Number of times the task will retry before permanent
* failure. Return `null` to retry indefinitely.
*
* @task config
*/
public function getMaximumRetryCount() {
return null;
}
/**
* Return the number of seconds a task should wait after a failure before
* retrying. For most tasks you can leave this at `null`, which will give you
* a short default retry period (currently 60 seconds).
*
* @param PhabricatorWorkerTask The task itself. This object is probably
* useful mostly to examine the failure
* count if you want to implement staggered
* retries, or to examine the execution
* exception if you want to react to
* different failures in different ways.
* @param Exception The exception which caused the failure.
* @return int|null Number of seconds to wait between retries,
* or null for a default retry period
* (currently 60 seconds).
*
* @task config
*/
public function getWaitBeforeRetry(PhabricatorWorkerTask $task) {
return null;
}
abstract protected function doWork();
final public function __construct($data) {
$this->data = $data;
}
final protected function getTaskData() {
return $this->data;
}
final public function executeTask() {
$this->doWork();
}
final public static function scheduleTask($task_class, $data) {
return id(new PhabricatorWorkerActiveTask())
->setTaskClass($task_class)
->setData($data)
->save();
}
/**
* Wait for tasks to complete. If tasks are not leased by other workers, they
* will be executed in this process while waiting.
*
* @param list<int> List of queued task IDs to wait for.
* @return void
*/
final public static function waitForTasks(array $task_ids) {
$task_table = new PhabricatorWorkerActiveTask();
$waiting = array_fuse($task_ids);
while ($waiting) {
$conn_w = $task_table->establishConnection('w');
// Check if any of the tasks we're waiting on are still queued. If they
// are not, we're done waiting.
$row = queryfx_one(
$conn_w,
'SELECT COUNT(*) N FROM %T WHERE id IN (%Ld)',
$task_table->getTableName(),
$waiting);
if (!$row['N']) {
// Nothing is queued anymore. Stop waiting.
break;
}
$tasks = id(new PhabricatorWorkerLeaseQuery())
->withIDs($waiting)
->setLimit(1)
->execute();
if (!$tasks) {
// We were not successful in leasing anything. Sleep for a bit and
// see if we have better luck later.
sleep(1);
continue;
}
$task = head($tasks)->executeTask();
$ex = $task->getExecutionException();
if ($ex) {
throw $ex;
}
}
$tasks = id(new PhabricatorWorkerArchiveTask())->loadAllWhere(
'id IN (%Ld)',
$task_ids);
foreach ($tasks as $task) {
if ($task->getResult() != PhabricatorWorkerArchiveTask::RESULT_SUCCESS) {
throw new Exception("Task ".$task->getID()." failed!");
}
}
}
public function renderForDisplay() {
$data = PhutilReadableSerializer::printableValue($this->data);
$data = phutil_escape_html($data);
$data = '<pre>'.$data.'</pre>';
return $data;
}
}

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