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<?php
namespace gipfl\SystemD;
use Exception;
use InvalidArgumentException;
use React\EventLoop\LoopInterface;
use React\EventLoop\TimerInterface;
use RuntimeException;
class NotifySystemD
{
/** @var LoopInterface */
protected $loop;
/** @var TimerInterface */
protected $timer;
/** @var string|null */
protected $path;
/** @var string|null */
protected $status;
/** @var float */
protected $interval;
/** @var bool */
protected $reloading = false;
/** @var bool */
protected $ready = false;
/** @var bool */
protected $failed = false;
/** @var string|null The Invocation ID (128bit UUID) if available */
protected $invocationId;
protected $notificationSocket;
/**
* NotifySystemD constructor.
* @param string $notifySocket
* @param int $intervalSecs
*/
public function __construct($notifySocket, $intervalSecs = 1)
{
$this->interval = $intervalSecs;
$this->notificationSocket = new NotificationSocket($notifySocket);
}
/**
* Starts sending WatchDog pings
*
* @param LoopInterface $loop
*/
public function run(LoopInterface $loop)
{
$this->loop = $loop;
$ping = function () {
try {
$this->pingWatchDog();
} catch (Exception $e) {
printf(
"<%d>Failed to ping systemd watchdog: %s\n",
LOG_ERR,
$e->getMessage()
);
}
};
$loop->futureTick($ping);
$this->timer = $loop->addPeriodicTimer($this->interval, $ping);
return $this;
}
/**
* Stop sending watchdog notifications
*
* Usually there is no need to do so, and the destructor does this anyways
*/
public function stop()
{
if ($this->timer !== null) {
$this->loop->cancelTimer($this->timer);
}
}
public static function ifRequired(LoopInterface $loop, $env = null)
{
if ($env === null) {
$env = $_SERVER;
}
if (! systemd::startedThisProcess($env)) {
return false;
}
if (isset($env['WATCHDOG_USEC'])) {
$interval = $env['WATCHDOG_USEC'] / 2000000; // Half of that time
} else {
$interval = 1;
}
return (new static($env['NOTIFY_SOCKET'], $interval))
->eventuallySetInvocationIdFromEnv($env)
->run($loop);
}
/**
* Extend the Watchdog timeout
*
* Useful to inform systemd before slow startup/shutdown operations. This
* is available since systemd v236. Older versions silently ignore this.
*
* @param float $seconds
*/
public function extendTimeout($seconds)
{
$this->send(['EXTEND_TIMEOUT_USEC' => (int) $seconds * 1000000]);
}
/**
* Send a notification to the systemd watchdog
*/
public function pingWatchDog()
{
$this->send(['WATCHDOG' => '1']);
}
/**
* Set the (visible) service status
*
* @param $status
*/
public function setStatus($status)
{
if ($status !== $this->status) {
$this->status = $status;
$this->send(['STATUS' => $status]);
}
}
public function setReloading($status = null)
{
$this->ready = false;
$this->status = $status;
$params = ['RELOADING' => '1'];
if ($status !== null) {
$params['STATUS'] = $status;
}
$this->send($params);
}
public function setError($error, $status = null)
{
$this->ready = false;
$this->status = $status;
if ($error instanceof Exception) {
$errNo = $error->getCode();
$status = $status ?: $error->getMessage();
} elseif (\is_int($error)) {
$errNo = $error;
} else {
throw new InvalidArgumentException(
'Error has to be an Exception or an Integer'
);
}
$params = [];
if ($status !== null) {
$params['STATUS'] = $status;
$this->status = $status;
}
$params = ['ERRNO' => (string) $errNo];
$this->send($params);
$this->failed = true;
}
public function setReady($status = null)
{
$this->ready = true;
$params = [
'READY' => '1',
'MAINPID' => \posix_getpid(),
];
if ($status !== null) {
$params['STATUS'] = $status;
$this->status = $status;
}
$this->send($params);
}
/**
* Returns a 128bit uuid (16 hex characters) Invocation ID if available,
* null in case there isn't
*
* @return string|null
*/
public function getInvocationId()
{
return $this->invocationId;
}
/**
* Whether we got an Invocation ID
*
* @return bool
*/
public function hasInvocationId()
{
return $this->invocationId !== null;
}
/**
* Get the path to the the systemd notification socket
*
* Usually /run/systemd/notify or similar
*
* @return string
*/
public function getSocketPath()
{
return $this->notificationSocket->getPath();
}
/**
* Our Watchdog interval in seconds
*
* This is a float value: half of WATCHDOG_USEC if given - otherwise 1 second
*
* @return float
*/
public function getWatchdogInterval()
{
return $this->interval;
}
/**
* Send custom parameters to systemd
*
* This is for internal use only, but might be used to test new functionality
*
* @param array $params
* @internal
*/
public function send(array $params)
{
if ($this->failed) {
throw new RuntimeException('Cannot notify SystemD after failing');
}
$this->notificationSocket->send($params);
}
/**
* If INVOCATION_ID is available in the given ENV array: keep it
*
* Fails in case we do not get an 128bit string
*
* @param array $env
* @return $this
*/
protected function eventuallySetInvocationIdFromEnv(array $env)
{
$key = 'INVOCATION_ID';
if (isset($env[$key])) {
if (\strlen($env[$key]) === 32) {
$this->invocationId = $env[$key];
} else {
throw new RuntimeException(sprintf(
'Unsupported %s="%s"',
$key,
$env['$key']
));
}
}
return $this;
}
public function __destruct()
{
$this->notificationSocket->disconnect();
$this->notificationSocket = null;
$this->stop();
unset($this->loop);
}
}
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