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PhabricatorTaskmasterDaemon.php
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Sun, Jan 26, 14:20

PhabricatorTaskmasterDaemon.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
final class PhabricatorTaskmasterDaemon extends PhabricatorDaemon {
public function run() {
$lease_ownership_name = $this->getLeaseOwnershipName();
$task_table = new PhabricatorWorkerTask();
$taskdata_table = new PhabricatorWorkerTaskData();
$sleep = 0;
do {
$conn_w = $task_table->establishConnection('w');
queryfx(
$conn_w,
'UPDATE %T SET leaseOwner = %s, leaseExpires = UNIX_TIMESTAMP() + 15
WHERE leaseOwner IS NULL LIMIT 1',
$task_table->getTableName(),
$lease_ownership_name);
$rows = $conn_w->getAffectedRows();
if (!$rows) {
$rows = queryfx(
$conn_w,
'UPDATE %T SET leaseOwner = %s, leaseExpires = UNIX_TIMESTAMP() + 15
WHERE leaseExpires < UNIX_TIMESTAMP() LIMIT 1',
$task_table->getTableName(),
$lease_ownership_name);
$rows = $conn_w->getAffectedRows();
}
if ($rows) {
$data = queryfx_all(
$conn_w,
'SELECT task.*, taskdata.data _taskData, UNIX_TIMESTAMP() _serverTime
FROM %T task LEFT JOIN %T taskdata
ON taskdata.id = task.dataID
WHERE leaseOwner = %s AND leaseExpires > UNIX_TIMESTAMP()
LIMIT 1',
$task_table->getTableName(),
$taskdata_table->getTableName(),
$lease_ownership_name);
$tasks = $task_table->loadAllFromArray($data);
$tasks = mpull($tasks, null, 'getID');
$task_data = array();
foreach ($data as $row) {
$tasks[$row['id']]->setServerTime($row['_serverTime']);
if ($row['_taskData']) {
$task_data[$row['id']] = json_decode($row['_taskData'], true);
} else {
$task_data[$row['id']] = null;
}
}
foreach ($tasks as $task) {
// TODO: We should detect if we acquired a task with an expired lease
// and log about it / bump up failure count.
// TODO: We should detect if we acquired a task with an excessive
// failure count and fail it permanently.
$data = idx($task_data, $task->getID());
$class = $task->getTaskClass();
try {
if (!class_exists($class) ||
!is_subclass_of($class, 'PhabricatorWorker')) {
throw new Exception(
"Task class '{$class}' does not extend PhabricatorWorker.");
}
$worker = newv($class, array($data));
$lease = $worker->getRequiredLeaseTime();
if ($lease !== null) {
$task->setLeaseDuration($lease);
}
$worker->executeTask();
$task->delete();
if ($data !== null) {
queryfx(
$conn_w,
'DELETE FROM %T WHERE id = %d',
$taskdata_table->getTableName(),
$task->getDataID());
}
} catch (Exception $ex) {
$task->setFailureCount($task->getFailureCount() + 1);
$task->save();
throw $ex;
}
}
$sleep = 0;
} else {
$sleep = min($sleep + 1, 30);
}
$this->sleep($sleep);
} while (true);
}
private function getLeaseOwnershipName() {
static $name = null;
if ($name === null) {
$name = getmypid().':'.time().':'.php_uname('n');
}
return $name;
}
}

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