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我们有一个网站,可以将文件流式传输给我们的客户。现在,我们开始拥有大于 300Mb 的文件,并且没有明显的原因,下载随机失败。我们收到“下载被中断”错误。

我们登录到服务器并发现 PHP 进程有时会在开始下载时关闭,但在事件查看器或日志中都没有任何意义。

这是提供下载的代码:

public function downloadAction($asset, $csrfToken) {
        if ($this->securityContext->isCsrfProtectionTokenValid($csrfToken) === FALSE) {
            throw new \TYPO3\Flow\Security\Exception\AccessDeniedException();
        }

        // This is a : \TYPO3\Flow\Resource\Resource
        $resource = $asset->getResource();
        $stream = $resource->getStream();

        if (FALSE === $stream) {
            $this->throwStatus(500);
        }

        try {
            $streamMetadata = stream_get_meta_data($stream);
            $modified = filemtime($streamMetadata['uri']);
            $filename = $asset->getResource()->getFilename();

            $this->response->setStatus(200);
            $this->response->setHeader('Content-Type', 'application/octet-stream');
            $this->response->setHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
            $this->response->setHeader('Last-Modified', gmdate('r', $modified));
            $this->response->setHeader('Content-Length', $asset->getResource()->getFileSize());
            $this->response->setHeader('Content-transfer-encoding', 'binary');
            $this->response->sendHeaders();

            @set_time_limit(86400);

            $fileBuffer = 8192;
            while (!feof($stream)) {
                print(fread($stream, $fileBuffer));
                ob_flush();
                flush();
            }
        } finally {
            fclose($stream);
        }

        return '';
    }

这是我们的设置:

  • 视窗服务器 2008 R2
  • IIS 7.5
  • PHP 5.5.30

我尝试了什么:

我尝试将 memory_limit 增加到 1024Mb,以增加超时,以增加脚本执行时间,但我们没有从增加这些中获得任何好处。

从事件查看器中,当下载失败时,我们会收到很多错误:

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x0000000000d94b98
Faulting process id: 0x26a0
Faulting application start time: 0x01d1c3157fec8818
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: unknown
Report Id: 9ea4b22a-2f09-11e6-8366-00155d016700

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2
Faulting module name: nativerd.dll, version: 7.5.7601.17855, time stamp: 0x4fc85321
Exception code: 0xc0000005
Fault offset: 0x000000000000f4d3
Faulting process id: 0x2170
Faulting application start time: 0x01d1c310490342e2
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: c:\windows\system32\inetsrv\nativerd.dll
Report Id: 9ea48b1a-2f09-11e6-8366-00155d016700

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2
Faulting module name: iisfcgi.dll, version: 7.5.7601.17514, time stamp: 0x4ce7c6cb
Exception code: 0xc0000005
Fault offset: 0x0000000000007a47
Faulting process id: 0x28b8
Faulting application start time: 0x01d1c3016d933dec
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Windows\System32\inetsrv\iisfcgi.dll
Report Id: 82a04d74-2f03-11e6-8366-00155d016700

编辑 1

看起来像修改缓冲区并将其设置为 12000 有效,但不是 11999。这是什么魔法?

4

2 回答 2

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你试过用 readfile() 替换 fread() 吗?它不是打开文件处理程序,通过 php 读取和传输文件块,而是直接将文件内容流式传输到网络服务器。

http://php.net/manual/de/function.readfile.php

于 2016-06-13T09:59:37.340 回答
0

显然,把$fileBufferat放在12000工作上而不是放在11999...... 但是为什么呢?

于 2016-06-13T15:07:51.827 回答