从Laravel存储下载而不将整个文件加载到内存中 [英] Download from Laravel storage without loading whole file in memory
问题描述
我正在使用Laravel Storage,我想为用户提供一些文件(大于内存限制).我的代码的灵感来自SO中的帖子,其内容如下:
I am using Laravel Storage and I want to serve users some (larger than memory limit) files. My code was inspired from a post in SO and it goes like this:
$fs = Storage::getDriver();
$stream = $fs->readStream($file->path);
return response()->stream(
function() use($stream) {
fpassthru($stream);
},
200,
[
'Content-Type' => $file->mime,
'Content-disposition' => 'attachment; filename="'.$file->original_name.'"',
]);
不幸的是,我遇到大文件错误:
Unfourtunately, I run into an error for large files:
[2016-04-21 13:37:13] production.ERROR: exception 'Symfony\Component\Debug\Exception\FatalErrorException' with message 'Allowed memory size of 134217728 bytes exhausted (tried to allocate 201740288 bytes)' in /path/app/Http/Controllers/FileController.php:131
Stack trace:
#0 /path/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(133): Symfony\Component\Debug\Exception\FatalErrorException->__construct()
#1 /path/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(118): Illuminate\Foundation\Bootstrap\HandleExceptions->fatalExceptionFromError()
#2 /path/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(0): Illuminate\Foundation\Bootstrap\HandleExceptions->handleShutdown()
#3 /path/app/Http/Controllers/FileController.php(131): fpassthru()
#4 /path/vendor/symfony/http-foundation/StreamedResponse.php(95): App\Http\Controllers\FileController->App\Http\Controllers\{closure}()
#5 /path/vendor/symfony/http-foundation/StreamedResponse.php(95): call_user_func:{/path/vendor/symfony/http-foundation/StreamedResponse.php:95}()
#6 /path/vendor/symfony/http-foundation/Response.php(370): Symfony\Component\HttpFoundation\StreamedResponse->sendContent()
#7 /path/public/index.php(56): Symfony\Component\HttpFoundation\Response->send()
#8 /path/public/index.php(0): {main}()
#9 {main}
似乎它试图将所有文件加载到内存中.我原以为使用stream和passthru不会做到这一点……我的代码中缺少某些内容吗?我必须以某种方式指定块大小还是什么?
It seems that it tries to load all of the file into memory. I was expecting that usage of stream and passthru would not do this... Is there something missing in my code? Do I have to somehow specify chunk size or what?
我使用的版本是Laravel 5.1和PHP 5.6.
The versions I am using are Laravel 5.1 and PHP 5.6.
推荐答案
输出缓冲似乎仍在内存中累积很多.
It seems that output buffering is still building up a lot in memory.
尝试在执行fpassthru之前禁用ob:
Try disabling ob before doing the fpassthru:
function() use($stream) {
while(ob_get_level() > 0) ob_end_flush();
fpassthru($stream);
},
可能存在多个活动的输出缓冲区,这就是为什么需要while的原因.
It could be that there are multiple output buffers active that is why the while is needed.
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