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<?php
namespace Illuminate\Queue;
use Closure;
use Symfony\Component\Process\Process;
use Symfony\Component\Process\PhpExecutableFinder;
class Listener
{
/**
* The command working path.
*
* @var string
*/
protected $commandPath;
/**
* The environment the workers should run under.
*
* @var string
*/
protected $environment;
/**
* The amount of seconds to wait before polling the queue.
*
* @var int
*/
protected $sleep = 3;
/**
* The amount of times to try a job before logging it failed.
*
* @var int
*/
protected $maxTries = 0;
/**
* The output handler callback.
*
* @var \Closure|null
*/
protected $outputHandler;
/**
* Create a new queue listener.
*
* @param string $commandPath
* @return void
*/
public function __construct($commandPath)
{
$this->commandPath = $commandPath;
}
/**
* Get the PHP binary.
*
* @return string
*/
protected function phpBinary()
{
return (new PhpExecutableFinder)->find(false);
}
/**
* Get the Artisan binary.
*
* @return string
*/
protected function artisanBinary()
{
return defined('ARTISAN_BINARY') ? ARTISAN_BINARY : 'artisan';
}
/**
* Listen to the given queue connection.
*
* @param string $connection
* @param string $queue
* @param \Illuminate\Queue\ListenerOptions $options
* @return void
*/
public function listen($connection, $queue, ListenerOptions $options)
{
$process = $this->makeProcess($connection, $queue, $options);
while (true) {
$this->runProcess($process, $options->memory);
}
}
/**
* Create a new Symfony process for the worker.
*
* @param string $connection
* @param string $queue
* @param \Illuminate\Queue\ListenerOptions $options
* @return \Symfony\Component\Process\Process
*/
public function makeProcess($connection, $queue, ListenerOptions $options)
{
$command = $this->createCommand(
$connection,
$queue,
$options
);
// If the environment is set, we will append it to the command array so the
// workers will run under the specified environment. Otherwise, they will
// just run under the production environment which is not always right.
if (isset($options->environment)) {
$command = $this->addEnvironment($command, $options);
}
return new Process(
$command,
$this->commandPath,
null,
null,
$options->timeout
);
}
/**
* Add the environment option to the given command.
*
* @param array $command
* @param \Illuminate\Queue\ListenerOptions $options
* @return array
*/
protected function addEnvironment($command, ListenerOptions $options)
{
return array_merge($command, ["--env={$options->environment}"]);
}
/**
* Create the command with the listener options.
*
* @param string $connection
* @param string $queue
* @param \Illuminate\Queue\ListenerOptions $options
* @return array
*/
protected function createCommand($connection, $queue, ListenerOptions $options)
{
return array_filter([
$this->phpBinary(),
$this->artisanBinary(),
'queue:work',
$connection,
'--once',
"--queue={$queue}",
"--delay={$options->delay}",
"--memory={$options->memory}",
"--sleep={$options->sleep}",
"--tries={$options->maxTries}",
], function ($value) {
return ! is_null($value);
});
}
/**
* Run the given process.
*
* @param \Symfony\Component\Process\Process $process
* @param int $memory
* @return void
*/
public function runProcess(Process $process, $memory)
{
$process->run(function ($type, $line) {
$this->handleWorkerOutput($type, $line);
});
// Once we have run the job we'll go check if the memory limit has been exceeded
// for the script. If it has, we will kill this script so the process manager
// will restart this with a clean slate of memory automatically on exiting.
if ($this->memoryExceeded($memory)) {
$this->stop();
}
}
/**
* Handle output from the worker process.
*
* @param int $type
* @param string $line
* @return void
*/
protected function handleWorkerOutput($type, $line)
{
if (isset($this->outputHandler)) {
call_user_func($this->outputHandler, $type, $line);
}
}
/**
* Determine if the memory limit has been exceeded.
*
* @param int $memoryLimit
* @return bool
*/
public function memoryExceeded($memoryLimit)
{
return (memory_get_usage(true) / 1024 / 1024) >= $memoryLimit;
}
/**
* Stop listening and bail out of the script.
*
* @return void
*/
public function stop()
{
die;
}
/**
* Set the output handler callback.
*
* @param \Closure $outputHandler
* @return void
*/
public function setOutputHandler(Closure $outputHandler)
{
$this->outputHandler = $outputHandler;
}
}