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<?php
namespace Laravel\Horizon;
use Closure;
use Laravel\Horizon\Contracts\HorizonCommandQueue;
use Laravel\Horizon\MasterSupervisorCommands\AddSupervisor;
use Laravel\Horizon\SupervisorCommands\Terminate;
class SupervisorProcess extends WorkerProcess
{
/**
* The name of the supervisor.
*
* @var string
*/
public $name;
/**
* The supervisor process options.
*
* @var \Laravel\Horizon\SupervisorOptions
*/
public $options;
/**
* Indicates if the process is "dead".
*
* @var bool
*/
public $dead = false;
/**
* The exit codes on which supervisor should be marked as dead.
*
* @var array
*/
public $dontRestartOn = [
0,
2,
13, // Indicates duplicate supervisors...
];
/**
* Create a new supervisor process instance.
*
* @param \Laravel\Horizon\SupervisorOptions $options
* @param \Symfony\Component\Process\Process $process
* @param \Closure|null $output
* @return void
*/
public function __construct(SupervisorOptions $options, $process, Closure $output = null)
{
$this->options = $options;
$this->name = $options->name;
$this->output = $output ?: function () {
//
};
parent::__construct($process);
}
/**
* Evaluate the current state of the process.
*
* @return void
*/
public function monitor()
{
if (! $this->process->isStarted()) {
return $this->restart();
}
// First, we will check to see if the supervisor failed as a duplicate and if
// it did we will go ahead and mark it as dead. We will do this before the
// other checks run because we do not care if this is cooling down here.
if (! $this->process->isRunning() &&
$this->process->getExitCode() === 13) {
return $this->markAsDead();
}
// If the process is running or cooling down from a failure, we don't need to
// attempt to do anything right now, so we can just bail out of the method
// here and it will get checked out during the next master monitor loop.
if ($this->process->isRunning() ||
$this->coolingDown()) {
return;
}
// Next, we will determine if the exit code is one that means this supervisor
// should be marked as dead and not be restarted. Typically, this could be
// an indication that the supervisor was simply purposefully terminated.
$exitCode = $this->process->getExitCode();
$this->markAsDead();
// If the supervisor exited with a status code that we do not restart on then
// we will not attempt to restart it. Otherwise, we will need to provision
// it back out based on the latest provisioning information we have now.
if (in_array($exitCode, $this->dontRestartOn)) {
return;
}
$this->reprovision();
}
/**
* Re-provision this supervisor process based on the provisioning plan.
*
* @return void
*/
protected function reprovision()
{
app(HorizonCommandQueue::class)->push(
MasterSupervisor::commandQueue(),
AddSupervisor::class,
$this->options->toArray()
);
}
/**
* Terminate the supervisor with the given status.
*
* @param int $status
* @return void
*/
public function terminateWithStatus($status)
{
app(HorizonCommandQueue::class)->push(
$this->options->name, Terminate::class, ['status' => $status]
);
}
/**
* Mark the process as "dead".
*
* @return void
*/
protected function markAsDead()
{
$this->dead = true;
}
}