测试以查看Gearman守护程序是否正在运行

Question

我想查看Gearman守护程序是否正在运行.然后才运行任务,以便我的应用程序不会崩溃.

这是我的代码:

$daemonRunning = true;

while( true )
{
    try
    {
        Yii::app()->gearman->client->ping( true );

        if ( $daemonRunning === false )
        {
            echo "Daemon back online. Starting signature process...\n";
        }

        Yii::app()->gearman->client->runTasks();
    }
    catch( GearmanException $e )
    {
        echo "Daemon appears to be down. Waiting for it to come back up...\n";
        $daemonRunning = false;
    }
    sleep(1);
}

但问题是ping不会抛出异常,它会抛出一个致命的错误:

PHP Error[2]: GearmanClient::ping(): flush(GEARMAN_COULD_NOT_CONNECT) 127.0.0.1:4730 -> libgearman/connection.cc:673

虽然奇怪的是,如果我删除ping并仅使用runTasks,则抛出异常.

有关:

当进程运行时Gearman守护程序关闭时,如何处理错误？当我关闭Gearman守护进程时,我从PHP得到以下错误:

php: libgearman/universal.cc:481: gearman_return_t connection_loop(gearman_universal_st&, const gearman_packet_st&, Check&): Assertion `&con->_packet == universal.packet_list' failed.
Aborted (core dumped)

Answer 1

在最基本的情况下,可以通过命令行使用以下命令检查Gearman服务器的状态:

(echo status ; sleep 0.1) | nc 127.0.0.1 4730 -w 1

但是,如此问题中所述,您可以使用它fsocketopen来获取齿轮箱服务器的状态.

 // Taken from https://stackoverflow.com/questions/2752431/any-way-to-access-gearman-administration
class Waps_Gearman_Server {

    /**
     * @var string
     */
    protected $host = "127.0.0.1";
    /**
     * @var int
     */
    protected $port = 4730;

    /**
     * @param string $host
     * @param int $port
     */
    public function __construct($host=null,$port=null){
        if( !is_null($host) ){
            $this->host = $host;
        }
        if( !is_null($port) ){
            $this->port = $port;
        }
    }

    /**
     * @return array | null
     */
    public function getStatus(){
        $status = null;
        $handle = fsockopen($this->host,$this->port,$errorNumber,$errorString,30);
        if($handle!=null){
            fwrite($handle,"status\n");
            while (!feof($handle)) {
                $line = fgets($handle, 4096);
                if( $line==".\n"){
                    break;
                }
                if( preg_match("~^(.*)[ \t](\d+)[ \t](\d+)[ \t](\d+)~",$line,$matches) ){
                    $function = $matches[1];
                    $status['operations'][$function] = array(
                        'function' => $function,
                        'total' => $matches[2],
                        'running' => $matches[3],
                        'connectedWorkers' => $matches[4],
                    );
                }
            }
            fwrite($handle,"workers\n");
            while (!feof($handle)) {
                $line = fgets($handle, 4096);
                if( $line==".\n"){
                    break;
                }
                // FD IP-ADDRESS CLIENT-ID : FUNCTION
                if( preg_match("~^(\d+)[ \t](.*?)[ \t](.*?) : ?(.*)~",$line,$matches) ){
                    $fd = $matches[1];
                    $status['connections'][$fd] = array(
                        'fd' => $fd,
                        'ip' => $matches[2],
                        'id' => $matches[3],
                        'function' => $matches[4],
                    );
                }
            }
            fclose($handle);
        }

        return $status;
    }

}

关于你的第二个问题,当连接丢失时,我从来没有能够找到一个齿轮工人.您基本上必须终止运行客户端工作程序的整个进程,并让主管收回并重新启动另一个工作进程.Gearman客户工作者应该是极端短暂的.您应该定期监视它们的内存使用情况并自动查杀它们.所以,如果你曾经遇到过segfault/coredump,那么杀死这名工人是完全正常的.

如上所述,您可以使用Supervisor自动启动工作人员.同时检查一下,它解释了如何让Gearman客户端与Supervisor一起工作