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<?php
namespace Icinga\Module\Director\Daemon;
use Exception;
use gipfl\Cli\Process;
use gipfl\IcingaCliDaemon\DbResourceConfigWatch;
use gipfl\SystemD\NotifySystemD;
use React\EventLoop\Factory as Loop;
use React\EventLoop\LoopInterface;
use Ramsey\Uuid\Uuid;
class BackgroundDaemon
{
/** @var LoopInterface */
private $loop;
/** @var NotifySystemD|boolean */
protected $systemd;
/** @var JobRunner */
protected $jobRunner;
/** @var string|null */
protected $dbResourceName;
/** @var DaemonDb */
protected $daemonDb;
/** @var DaemonProcessState */
protected $processState;
/** @var DaemonProcessDetails */
protected $processDetails;
/** @var LogProxy */
protected $logProxy;
/** @var bool */
protected $reloading = false;
/** @var bool */
protected $shuttingDown = false;
public function run(LoopInterface $loop = null)
{
if ($ownLoop = ($loop === null)) {
$loop = Loop::create();
}
$this->loop = $loop;
$this->loop->futureTick(function () {
$this->initialize();
});
if ($ownLoop) {
$loop->run();
}
}
public function setDbResourceName($name)
{
$this->dbResourceName = $name;
return $this;
}
protected function initialize()
{
$this->registerSignalHandlers($this->loop);
$this->processState = new DaemonProcessState('icinga::director');
$this->jobRunner = new JobRunner($this->loop);
$this->systemd = $this->eventuallyInitializeSystemd();
$this->processState->setSystemd($this->systemd);
if ($this->systemd) {
$this->systemd->setReady();
}
$this->setState('ready');
$this->processDetails = $this
->initializeProcessDetails($this->systemd)
->registerProcessList($this->jobRunner->getProcessList());
$this->logProxy = new LogProxy($this->processDetails->getInstanceUuid());
$this->jobRunner->forwardLog($this->logProxy);
$this->daemonDb = $this->initializeDb(
$this->processDetails,
$this->processState,
$this->dbResourceName
);
$this->daemonDb
->register($this->jobRunner)
->register($this->logProxy)
->register(new DeploymentChecker($this->loop))
->run($this->loop);
$this->setState('running');
}
/**
* @param NotifySystemD|false $systemd
* @return DaemonProcessDetails
*/
protected function initializeProcessDetails($systemd)
{
if ($systemd && $systemd->hasInvocationId()) {
$uuid = $systemd->getInvocationId();
} else {
try {
$uuid = \bin2hex(Uuid::uuid4()->getBytes());
} catch (Exception $e) {
$uuid = 'deadc0de' . \substr(\md5(\getmypid()), 0, 24);
}
}
$processDetails = new DaemonProcessDetails($uuid);
if ($systemd) {
$processDetails->set('running_with_systemd', 'y');
}
return $processDetails;
}
protected function eventuallyInitializeSystemd()
{
$systemd = NotifySystemD::ifRequired($this->loop);
if ($systemd) {
Logger::replaceRunningInstance(new SystemdLogWriter());
Logger::info(sprintf(
"Started by systemd, notifying watchdog every %0.2Gs via %s",
$systemd->getWatchdogInterval(),
$systemd->getSocketPath()
));
} else {
Logger::debug('Running without systemd');
}
return $systemd;
}
/**
* @return DaemonProcessDetails
*/
public function getProcessDetails()
{
return $this->processDetails;
}
/**
* @return DaemonProcessState
*/
public function getProcessState()
{
return $this->processState;
}
protected function initializeDb(
DaemonProcessDetails $processDetails,
DaemonProcessState $processState,
$dbResourceName = null
) {
$db = new DaemonDb($processDetails);
$db->on('state', function ($state, $level = null) use ($processState) {
// TODO: level is sent but not used
$processState->setComponentState('db', $state);
});
$db->on('schemaChange', function ($startupSchema, $dbSchema) {
Logger::info(sprintf(
"DB schema version changed. Started with %d, DB has %d. Restarting.",
$startupSchema,
$dbSchema
));
$this->reload();
});
$db->setConfigWatch(
$dbResourceName
? DbResourceConfigWatch::name($dbResourceName)
: DbResourceConfigWatch::module('director')
);
return $db;
}
protected function registerSignalHandlers(LoopInterface $loop)
{
$func = function ($signal) use (&$func) {
$this->shutdownWithSignal($signal, $func);
};
$funcReload = function () {
$this->reload();
};
$loop->addSignal(SIGHUP, $funcReload);
$loop->addSignal(SIGINT, $func);
$loop->addSignal(SIGTERM, $func);
}
protected function shutdownWithSignal($signal, &$func)
{
$this->loop->removeSignal($signal, $func);
$this->shutdown();
}
public function reload()
{
if ($this->reloading) {
Logger::error('Ignoring reload request, reload is already in progress');
return;
}
$this->reloading = true;
Logger::info('Going gown for reload now');
$this->setState('reloading the main process');
$this->daemonDb->disconnect()->then(function () {
Process::restart();
});
}
protected function shutdown()
{
if ($this->shuttingDown) {
Logger::error('Ignoring shutdown request, shutdown is already in progress');
return;
}
Logger::info('Shutting down');
$this->shuttingDown = true;
$this->setState('shutting down');
$this->daemonDb->disconnect()->then(function () {
Logger::info('DB has been disconnected, shutdown finished');
$this->loop->stop();
});
}
protected function setState($state)
{
if ($this->processState) {
$this->processState->setState($state);
}
return $this;
}
}
|
