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<?php |
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namespace Deployer\Executor; |
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use Deployer\Deployer; |
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use Deployer\Exception\Exception; |
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use Deployer\Task\Context; |
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use Psr\Http\Message\ServerRequestInterface; |
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use React; |
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use React\Http\Message\Response; |
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use Symfony\Component\Console\Helper\QuestionHelper; |
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use Symfony\Component\Console\Input\InputInterface; |
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use Symfony\Component\Console\Output\OutputInterface; |
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use Throwable; |
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use function Deployer\getHost; |
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class Server |
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{ |
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private $input; |
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private $output; |
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private $questionHelper; |
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/** |
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* @var React\EventLoop\LoopInterface |
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*/ |
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private $loop; |
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private $port; |
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public function __construct( |
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InputInterface $input, |
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OutputInterface $output, |
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QuestionHelper $questionHelper |
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) |
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{ |
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$this->input = $input; |
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$this->output = $output; |
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$this->questionHelper = $questionHelper; |
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} |
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public function start() |
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{ |
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$this->loop = React\EventLoop\Factory::create(); |
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$server = new React\Http\Server($this->loop, function (ServerRequestInterface $request) { |
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try { |
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return $this->router($request); |
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} catch (Throwable $exception) { |
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Deployer::printException($this->output, $exception); |
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return new React\Http\Message\Response(500, ['Content-Type' => 'text/plain'], 'Master error: ' . $exception->getMessage()); |
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} |
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}); |
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$socket = new React\Socket\Server(0, $this->loop); |
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$server->listen($socket); |
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$address = $socket->getAddress(); |
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$this->port = parse_url($address, PHP_URL_PORT); |
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} |
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private function router(ServerRequestInterface $request): Response |
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{ |
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$path = $request->getUri()->getPath(); |
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switch ($path) { |
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case '/load': |
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['host' => $host] = json_decode($request->getBody(), true); |
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$host = getHost($host); |
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$config = json_encode($host->config()->persist()); |
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return new Response(200, ['Content-Type' => 'application/json'], $config); |
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case '/save': |
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['host' => $host, 'config' => $config] = json_decode($request->getBody(), true); |
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$host = getHost($host); |
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$host->config()->update($config); |
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return new Response(200, ['Content-Type' => 'application/json'], 'true'); |
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case '/proxy': |
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['host' => $host, 'func' => $func, 'arguments' => $arguments] = json_decode($request->getBody(), true); |
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Context::push(new Context(getHost($host), $this->input, $this->output)); |
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$answer = call_user_func($func, ...$arguments); |
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Context::pop(); |
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return new Response(200, ['Content-Type' => 'application/json'], json_encode($answer)); |
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default: |
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throw new Exception('Server path not found: ' . $request->getUri()->getPath()); |
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} |
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} |
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public function addPeriodicTimer($interval, $callback) |
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{ |
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$this->loop->addPeriodicTimer($interval, $callback); |
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} |
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public function addTimer($interval, $callback) |
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{ |
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$this->loop->addTimer($interval, $callback); |
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} |
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public function cancelTimer($timer) |
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{ |
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$this->loop->cancelTimer($timer); |
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} |
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public function run() |
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{ |
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$this->loop->run(); |
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} |
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public function stop() |
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{ |
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$this->loop->stop(); |
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} |
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public function getPort(): int |
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{ |
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return $this->port; |
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} |
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} |
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This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$x
would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.