ruby-on-rails - 通过 ruby​​ OpenURI 下载文件时间歇性 EOFError

Question

我有一个 cron 作业定期从外部服务 (Twilio) 下载 mp3 文件然后使用 Paperclip 将文件上传到 Amazon S3 的设置。该过程由 Resque 在后台处理。

下面是处理从 Twilio 下载和随后附加到 Paperclip 的代码:

# Perform transfer from Twilio to S3
def self.perform(group_recording_id = nil)
  gr = GroupRecording.find(group_recording_id)
  # ...
  recording = TwilioClient.account.recordings.get(gr.external_id)

  if recording.present?
    # ....
    gr.audio_file = download_remote_file(gr.twilio_mp3_url)
    gr.save
  end
end

def download_remote_file(url)
  io = open(URI.parse(url))  

  # overrides Paperclip::Upfile#original_filename
  def io.original_filename
    base_uri.path.split('/').last
  end
  io.original_filename.blank? ? nil : io
end

由于 EOFError 而失败:

EOFError
end of file reached
/usr/local/lib/ruby/1.9.1/openssl/buffering.rb:145:in `sysread_nonblock'
/usr/local/lib/ruby/1.9.1/openssl/buffering.rb:145:in `read_nonblock'
/usr/local/lib/ruby/1.9.1/net/protocol.rb:135:in `rbuf_fill'
/usr/local/lib/ruby/1.9.1/net/protocol.rb:116:in `readuntil'
/usr/local/lib/ruby/1.9.1/net/protocol.rb:126:in `readline'
/usr/local/lib/ruby/1.9.1/net/http.rb:2219:in `read_status_line'
/usr/local/lib/ruby/1.9.1/net/http.rb:2208:in `read_new'
/usr/local/lib/ruby/1.9.1/net/http.rb:1191:in `transport_request'
/usr/local/lib/ruby/1.9.1/net/http.rb:1177:in `request'
/app/vendor/bundle/ruby/1.9.1/gems/rest-client-1.6.7/lib/restclient/net_http_ext.rb:51:in `request'
/usr/local/lib/ruby/1.9.1/open-uri.rb:312:in `block in open_http'
/usr/local/lib/ruby/1.9.1/net/http.rb:627:in `start'
/usr/local/lib/ruby/1.9.1/open-uri.rb:306:in `open_http'
/usr/local/lib/ruby/1.9.1/open-uri.rb:769:in `buffer_open'
/usr/local/lib/ruby/1.9.1/open-uri.rb:203:in `block in open_loop'
/usr/local/lib/ruby/1.9.1/open-uri.rb:201:in `catch'
/usr/local/lib/ruby/1.9.1/open-uri.rb:201:in `open_loop'
/usr/local/lib/ruby/1.9.1/open-uri.rb:146:in `open_uri'
/usr/local/lib/ruby/1.9.1/open-uri.rb:671:in `open'
/usr/local/lib/ruby/1.9.1/open-uri.rb:33:in `open'
/app/app/models/group_recording.rb:112:in `download_remote_file'
/app/app/models/group_recording.rb:85:in `perform'

上面是最常见的错误，不过我也遇到过这个:

Errno::ECONNRESET
Connection reset by peer
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/openssl/buffering.rb:145:in `sysread_nonblock'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/openssl/buffering.rb:145:in `read_nonblock'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/protocol.rb:135:in `rbuf_fill'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/protocol.rb:86:in `read'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:2424:in `read_body_0'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:2379:in `read_body'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:321:in `block (2 levels) in open_http'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:1194:in `block in transport_request'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:2342:in `reading_body'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:1193:in `transport_request'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:1177:in `request'
/app/vendor/bundle/ruby/1.9.1/gems/rest-client-1.6.7/lib/restclient/net_http_ext.rb:51:in `request'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:312:in `block in open_http'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/net/http.rb:627:in `start'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:306:in `open_http'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:769:in `buffer_open'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:203:in `block in open_loop'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:201:in `catch'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:201:in `open_loop'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:146:in `open_uri'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:671:in `open'
/app/vendor/ruby-1.9.2/lib/ruby/1.9.1/open-uri.rb:33:in `open'
/app/app/models/group_recording.rb:113:in `download_remote_file'
/app/app/models/group_recording.rb:86:in `perform'

该问题是间歇性的，最近才在heroku的生产环境中出现，相关代码没有任何改动。该应用目前在 heroku 上的 ruby 1.9.3-p429 上运行。该问题也发生在本地，但频率较低。我尝试了相同和更低的 ruby​​ 版本(低至 1.9.3-p194)。

有人遇到过类似的问题吗？在线搜索错误发现了类似的错误，但在截然不同的上下文中。

Answer 1

这些是您应该在代码中预料到的暂时性网络错误，并重试该操作(通常在短暂休眠后)。互联网不可靠!

您应该记录重试，如果您发现峰值或不寻常的模式，您可能需要与您的服务提供商(heroku、twilio 等)联系，因为他们可能会提供一些可以深入了解的东西。

尽管您无法通过代码直接解决问题(如果它确实没有改变)。