当 send_file 结束时清理/tmp [英] clean /tmp when send_file is over

问题描述

我有一个 Redmine 插件.我在/tmp 中创建了一个临时文件，然后用 File.open 发送它.我想在用户下载临时文件时删除它.我该怎么办?

I have a Redmine plugin. I create a temporary file in /tmp, then I send it with File.open. I want to delete the temporary file when user has download it. How can I do ?

我的代码(在控制器中):

My code (in a controller):

File.open(filelocation, 'r') do |file|
  send_file file, :filename => filename, :type => "application/pdf", :disposition => "attachment"
end

如果我在 File.open 之后删除文件，它不起作用.

If I remove the file after File.open, it doesn't work.

编辑

在我的控制器中:

def something
  temp = Tempfile.new(['PDF_','.pdf'])
  # ... some code that modify my pdf ...

  begin
    File.open(temp.path, 'r') do |file|
      send_file file, :filename => temp.path, :type => "application/pdf", :disposition => "attachment"
    end

  ensure
    temp.close
    temp.unlink
  end

end

我的临时文件被删除，但不在我的代码末尾:File.open 返回损坏的 PDF.

My temporary file is remove, but not in the end of my code: the File.open return a damage PDF.

推荐答案

我使用 send_data 而不是 send_file，然后我删除了文件.send_data 将阻塞直到数据发送，允许 File.delete 请求成功.

I use send_data instead of send_file, then I delete the file. send_data will block until the data is sent, allowing File.delete request to succeed.

 file = temp.path
 File.open(file, 'r') do |f|
   send_data f.read.force_encoding('BINARY'), :filename => filename, :type => "application/pdf", :disposition => "attachment"
 end
 File.delete(file)

来源:在Ruby on Rails，在 send_file 方法后从服务器中删除文件

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