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我正在使用 pdftk 合并 pdf 文件。有时，用户上传格式不正确的 pdf，它会挂起进程，不返回任何错误并消耗所有服务器资源。为了防止这种情况发生，我正在考虑实现进程调用，proc_open并希望为进程设置运行时间限制，如果超过时间限制则终止进程。

下面是我用来合并 pdf 文件的函数示例，如果我设置

stream_set_blocking($process, 0);

它返回一个错误：

stream_set_blocking(): supplied resource is not a valid stream resource

我认为此函数中的某些内容格式不正确，希望有人能够为我指出正确的方向...该函数目前没有返回任何错误，但不会根据需要在 30 秒后终止

 protected function pdf_merge($documents,$output_file,$time = 30){      

        $end = time() + $time;
        $cmd = sprintf('/usr/local/bin/pdftk %s cat output %s', $documents, $output_file);

        $descriptorspec = array(
           0 => array("pipe", "r"),  
           1 => array("pipe", "w"),  
           2 => array("file","./error.log","a")
        );

        $process = proc_open($cmd, $descriptorspec, $pipes);

        if (is_resource($process)) {
            stream_set_blocking($pipes[1], 0);
            while (!feof($pipes[1]) && (time() < $end)) {

                fwrite($pipes[0], stream_get_contents($pipes[0]));
                fclose($pipes[0]);

                $pdf_content = stream_get_contents($pipes[1]);
                fclose($pipes[1]);

                $return_value = proc_close($process);

                return $return_value;
            }   
            error_log('file is taking too long... kill process');
            proc_terminate();               
        }
    }
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1 回答 1

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Perhaps I'm off base here, does most of this code run?

fwrite($pipes[0], stream_get_contents($pipes[0]));

Looks like you are trying to write to the pipe whatever you can read from the pipe...

Also, you may want to check with get_proc_status() as the command may have completed by the time you try to set the blocking...

于 2013-02-05T13:02:21.437 回答