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phab/src/infrastructure/daemon/control/PhabricatorDaemonReference.php
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PhabricatorDaemonReference.php
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<?php
final class PhabricatorDaemonReference {
private $name;
private $argv;
private $pid;
private $start;
private $pidFile;
private $daemonLog;
public static function loadReferencesFromFile($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());
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');
$ref->name = idx($daemon, 'class');
$ref->argv = idx($daemon, 'argv', array());
// TODO: We previously identified daemon logs by using a <class, pid,
// epoch> tuple, but now all daemons under a single overseer will share
// that identifier. We can uniquely identify daemons by $daemon['id'],
// but that isn't currently written into the daemon logs. We should
// start writing it, then load the logs here. This would give us a
// slightly greater ability to keep the web UI in sync when daemons
// get killed forcefully and clean up `phd status` a bit.
$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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