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PhabricatorDaemonReference.php
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Created
Wed, Nov 27, 10:24

PhabricatorDaemonReference.php
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<?php
final class PhabricatorDaemonReference extends Phobject {
private $name;
private $argv;
private $pid;
private $start;
private $pidFile;
private $daemonLog;
public static function loadReferencesFromFile($path) {
$pid_data = Filesystem::readFile($path);
try {
$dict = phutil_json_decode($pid_data);
} catch (PhutilJSONParserException $ex) {
$dict = array();
}
$refs = array();
$daemons = idx($dict, 'daemons', array());
$logs = array();
$daemon_ids = ipull($daemons, 'id');
if ($daemon_ids) {
try {
$logs = id(new PhabricatorDaemonLogQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withDaemonIDs($daemon_ids)
->execute();
} catch (AphrontQueryException $ex) {
// Ignore any issues here; getting this information only allows us
// to provide a more complete picture of daemon status, and we want
// these commands to work if the database is inaccessible.
}
$logs = mpull($logs, null, 'getDaemonID');
}
// Support PID files that use the old daemon format, where each overseer
// had exactly one daemon. We can eventually remove this; they will still
// be stopped by `phd stop --force` even if we don't identify them here.
if (!$daemons && idx($dict, 'name')) {
$daemons = array(
array(
'config' => array(
'class' => idx($dict, 'name'),
'argv' => idx($dict, 'argv', array()),
),
),
);
}
foreach ($daemons as $daemon) {
$ref = new PhabricatorDaemonReference();
// NOTE: This is the overseer PID, not the actual daemon process PID.
// This is correct for checking status and sending signals (the only
// things we do with it), but might be confusing. $daemon['pid'] has
// the daemon PID, and we could expose that if we had some use for it.
$ref->pid = idx($dict, 'pid');
$ref->start = idx($dict, 'start');
$config = idx($daemon, 'config', array());
$ref->name = idx($config, 'class');
$ref->argv = idx($config, 'argv', array());
$log = idx($logs, idx($daemon, 'id'));
if ($log) {
$ref->daemonLog = $log;
}
$ref->pidFile = $path;
$refs[] = $ref;
}
return $refs;
}
public function updateStatus($new_status) {
if (!$this->daemonLog) {
return;
}
try {
$this->daemonLog
->setStatus($new_status)
->save();
} catch (AphrontQueryException $ex) {
// Ignore anything that goes wrong here.
}
}
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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