php - 如何在 Symfony2 应用程序的 Controller 中执行命令并在 Twig 模板中实时打印输出

Question

我需要在我的 Symfony2 应用程序的 Controller 中执行一个持久的命令，并实时向用户返回终端的输出。

我读过这个:

http://symfony.com/doc/current/components/process.html#getting-real-time-process-output

我不知道如何在 Twig 模板中实时打印终端输出。

编辑:感谢 Matteo 的代码和用户的评论，最终实现是:

/**
 * @Route("/genera-xxx-r", name="commission_generate_r_xxx")
 * @Method({"GET"})
 */
public function generateRXXXsAction()
{
    //remove time constraints if your script last very long
    set_time_limit(0);        

    $rFolderPath = $this->container->getParameter('xxx_settings')['r_setting_folder_path'];
    $script = 'R --slave -f ' . $rFolderPath . 'main.R';

    $response = new StreamedResponse();
    $process = new Process($script);
    $response->setCallback(function() use ($process) {
        $process->run(function ($type, $buffer) {
            //if you don't want to render a template, please refer to the @Matteo's reply
            echo $this->renderView('AppBundle:Commission:_process.html.twig',
                array(
                    'type' => $type,
                    'buffer' => $buffer
                ));
            //according to @Ilmari Karonen a flush call could fix some buffering issues
            flush();
        });
    });
    $response->setStatusCode(200);
    return $response;
}

Answer 1

如果您需要启动一个简单的 shell 脚本并捕获输出，您可以使用 StreamedResponse结合您发布的 Process 回调。

例如，假设您有一个非常简单的 bash 脚本，如下所示:

loop.sh

for i in {1..500}
do
   echo "Welcome $i times"
done

您可以像这样实现您的操作:

/**
 * @Route("/process", name="_processaction")
 */
public function processAction()
{
    // If your script take a very long time:
    // set_time_limit(0);
    $script='/path-script/.../loop.sh';
    $process = new Process($script);

    $response->setCallback(function() use ($process) {
        $process->run(function ($type, $buffer) {
            if (Process::ERR === $type) {
                echo 'ERR > '.$buffer;
            } else {
                echo 'OUT > '.$buffer;
                echo '<br>';
            }
        });
    });
    $response->setStatusCode(200);
    return $response;
}

根据缓冲区长度，您可以得到如下输出:

.....
OUT > Welcome 40 times Welcome 41 times 
OUT > Welcome 42 times Welcome 43 times 
OUT > Welcome 44 times Welcome 45 times 
OUT > Welcome 46 times Welcome 47 times 
OUT > Welcome 48 times 
OUT > Welcome 49 times Welcome 50 times 
OUT > Welcome 51 times Welcome 52 times 
OUT > Welcome 53 times 
.....

例如，您可以使用呈现 Controller 将其包装在页面的一部分中:

<div id="process">
    {{ render(controller(
        'AcmeDemoBundle:Test:processAction'
    )) }}
</div>

更多信息 here

希望对你有帮助