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<?php
namespace Laravel\Horizon;
use Carbon\CarbonImmutable;
use Closure;
use Laravel\Horizon\Events\UnableToLaunchProcess;
use Laravel\Horizon\Events\WorkerProcessRestarting;
use Symfony\Component\Process\Exception\ExceptionInterface;
class WorkerProcess
{
/**
* The underlying Symfony process.
*
* @var \Symfony\Component\Process\Process
*/
public $process;
/**
* The output handler callback.
*
* @var \Closure
*/
public $output;
/**
* The time at which the cooldown period will be over.
*
* @var \Carbon\CarbonImmutable
*/
public $restartAgainAt;
/**
* Create a new worker process instance.
*
* @param \Symfony\Component\Process\Process $process
* @return void
*/
public function __construct($process)
{
$this->process = $process;
}
/**
* Start the process.
*
* @param \Closure $callback
* @return $this
*/
public function start(Closure $callback)
{
$this->output = $callback;
$this->cooldown();
$this->process->start($callback);
return $this;
}
/**
* Pause the worker process.
*
* @return void
*/
public function pause()
{
$this->sendSignal(SIGUSR2);
}
/**
* Instruct the worker process to continue working.
*
* @return void
*/
public function continue()
{
$this->sendSignal(SIGCONT);
}
/**
* Evaluate the current state of the process.
*
* @return void
*/
public function monitor()
{
if ($this->process->isRunning() || $this->coolingDown()) {
return;
}
$this->restart();
}
/**
* Restart the process.
*
* @return void
*/
protected function restart()
{
if ($this->process->isStarted()) {
event(new WorkerProcessRestarting($this));
}
$this->start($this->output);
}
/**
* Terminate the underlying process.
*
* @return void
*/
public function terminate()
{
$this->sendSignal(SIGTERM);
}
/**
* Stop the underlying process.
*
* @return void
*/
public function stop()
{
if ($this->process->isRunning()) {
$this->process->stop();
}
}
/**
* Send a POSIX signal to the process.
*
* @param int $signal
* @return void
*/
protected function sendSignal($signal)
{
try {
$this->process->signal($signal);
} catch (ExceptionInterface $e) {
if ($this->process->isRunning()) {
throw $e;
}
}
}
/**
* Begin the cool-down period for the process.
*
* @return void
*/
protected function cooldown()
{
if ($this->coolingDown()) {
return;
}
if ($this->restartAgainAt) {
$this->restartAgainAt = ! $this->process->isRunning()
? CarbonImmutable::now()->addMinute()
: null;
if (! $this->process->isRunning()) {
event(new UnableToLaunchProcess($this));
}
} else {
$this->restartAgainAt = CarbonImmutable::now()->addSecond();
}
}
/**
* Determine if the process is cooling down from a failed restart.
*
* @return bool
*/
public function coolingDown()
{
return isset($this->restartAgainAt) &&
CarbonImmutable::now()->lt($this->restartAgainAt);
}
/**
* Set the output handler.
*
* @param \Closure $callback
* @return $this
*/
public function handleOutputUsing(Closure $callback)
{
$this->output = $callback;
return $this;
}
/**
* Pass on method calls to the underlying process.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
return $this->process->{$method}(...$parameters);
}
}