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PhabricatorDaemonReference.php
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Tue, Jan 7, 10:41

PhabricatorDaemonReference.php
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<?php
final class PhabricatorDaemonReference {
private $name;
private $argv;
private $pid;
private $start;
private $pidFile;
private $daemonLog;
public static function newFromFile($path) {
$pid_data = Filesystem::readFile($path);
try {
$dict = phutil_json_decode($pid_data);
} catch (PhutilJSONParserException $ex) {
$dict = array();
}
$ref = self::newFromDictionary($dict);
$ref->pidFile = $path;
return $ref;
}
public static function newFromDictionary(array $dict) {
$ref = new PhabricatorDaemonReference();
// TODO: This is a little rough during the transition from one-to-one
// overseers to one-to-many.
$config = idx($dict, 'config', array());
$daemon_list = null;
if ($config) {
$daemon_list = idx($config, 'daemons');
}
if ($daemon_list) {
$ref->name = pht('Overseer Daemon Group');
$ref->argv = array();
} else {
$ref->name = idx($dict, 'name', 'Unknown');
$ref->argv = idx($dict, 'argv', array());
}
$ref->pid = idx($dict, 'pid');
$ref->start = idx($dict, 'start');
try {
$ref->daemonLog = id(new PhabricatorDaemonLog())->loadOneWhere(
'daemon = %s AND pid = %d AND dateCreated = %d',
$ref->name,
$ref->pid,
$ref->start);
} catch (AphrontQueryException $ex) {
// Ignore the exception. We want to be able to terminate the daemons,
// even if MySQL is down.
}
return $ref;
}
/**
* Appropriate for getting @{class:PhabricatorDaemonReference} objects from
* the data from @{class:PhabricatorDaemonManagementWorkflow}'s method
* @{method:findRunningDaemons}.
*
* NOTE: the objects are not fully featured and should be used with caution.
*/
public static function newFromRogueDictionary(array $dict) {
$ref = new PhabricatorDaemonReference();
$ref->name = pht('Rogue %s', idx($dict, 'type'));
$ref->pid = idx($dict, 'pid');
return $ref;
}
public function updateStatus($new_status) {
try {
if (!$this->daemonLog) {
$this->daemonLog = id(new PhabricatorDaemonLog())->loadOneWhere(
'daemon = %s AND pid = %d AND dateCreated = %d',
$this->name,
$this->pid,
$this->start);
}
if ($this->daemonLog) {
$this->daemonLog
->setStatus($new_status)
->save();
}
} catch (AphrontQueryException $ex) {
// Ignore anything that goes wrong here. We anticipate at least two
// specific failure modes:
//
// - Upgrade scripts which run `git pull`, then `phd stop`, then
// `bin/storage upgrade` will fail when trying to update the `status`
// column, as it does not exist yet.
// - Daemons running on machines which do not have access to MySQL
// (like an IRC bot) will not be able to load or save the log.
//
//
}
}
public function getPID() {
return $this->pid;
}
public function getName() {
return $this->name;
}
public function getArgv() {
return $this->argv;
}
public function getEpochStarted() {
return $this->start;
}
public function getPIDFile() {
return $this->pidFile;
}
public function getDaemonLog() {
return $this->daemonLog;
}
public function isRunning() {
return self::isProcessRunning($this->getPID());
}
public static function isProcessRunning($pid) {
if (!$pid) {
return false;
}
if (function_exists('posix_kill')) {
// This may fail if we can't signal the process because we are running as
// a different user (for example, we are 'apache' and the process is some
// other user's, or we are a normal user and the process is root's), but
// we can check the error code to figure out if the process exists.
$is_running = posix_kill($pid, 0);
if (posix_get_last_error() == 1) {
// "Operation Not Permitted", indicates that the PID exists. If it
// doesn't, we'll get an error 3 ("No such process") instead.
$is_running = true;
}
} else {
// If we don't have the posix extension, just exec.
list($err) = exec_manual('ps %s', $pid);
$is_running = ($err == 0);
}
return $is_running;
}
public function waitForExit($seconds) {
$start = time();
while (time() < $start + $seconds) {
usleep(100000);
if (!$this->isRunning()) {
return true;
}
}
return !$this->isRunning();
}
}

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