GAE内部服务器错误URLError: <urlopen错误ftp错误: [Errno 110] 连接超时>

Question

我在Google App Engine（GAE）上想从FTP服务器下载文件，在我本地的开发环境中一切都很好。但是当这个应用在GAE上运行时，就出现了错误。有没有什么建议？谢谢你的帮助。

167.220.232.24 - - [09/Jun/2014:08:51:00 -0700] "GET /task/updateShipStatus/ HTTP/1.1" 500 10812 - "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36" "******.appspot.com" ms=19543 cpu_ms=2274 cpm_usd=0.001214 loading_request=1 instance=00c61b117c1ae14d753986063e6a1d8ac230349b app_engine_release=1.9.5
   E 23:50:44.530 *get* '220 LR-Fairplay FTP Server ready...\r\n'

   E 23:50:44.530 *resp* '220 LR-Fairplay FTP Server ready...'

   E 23:50:44.530 *cmd* 'USER bunge2'

   E 23:50:44.530 *put* 'USER bunge2\r\n'

   E 23:50:44.530 *get* '331 User name okay, need password.\r\n'

   E 23:50:44.530 *resp* '331 User name okay, need password.'

   E 23:50:44.530 *cmd* 'PASS ********'

   E 23:50:44.530 *put* 'PASS ********\r\n'

   E 23:50:44.530 *get* '230 User logged in, proceed.\r\n'
   E 23:50:44.530 *resp* '230 User logged in, proceed.'
   E 23:50:44.530 *cmd* 'CWD ./'
   E 23:50:44.530 *put* 'CWD ./\r\n'
   E 23:50:44.530 *get* 
   E 23:50:59.896 Internal Server Error: /task/updateShipStatus/

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/django-1.4/django/core/handlers/base.py", line 111, in get_response

    response = callback(request, *callback_args, **callback_kwargs)

  File "/base/data/home/apps/s~precise-rune-588/1.376434829982431426/googlemapapp/views.py", line 227, in updateShipStatus

    ftp.retrbinary('RETR 201406050450_combinedpositionsdata.txt', r.write, bufsize)

  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ftplib.py", line 409, in retrbinary

    conn = self.transfercmd(cmd, rest)

  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ftplib.py", line 371, in transfercmd

    return self.ntransfercmd(cmd, rest)[0]

  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ftplib.py", line 330, in ntransfercmd

    conn = socket.create_connection((host, port), self.timeout)

  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/socket.py", line 569, in create_connection

    raise err
error: [Errno 110] Connection timed out

   E 23:51:00.232 '250 Directory changed to /\r\n'

   E 23:51:00.232 *resp* '250 Directory changed to /'

   E 23:51:00.232 *cmd* 'TYPE I'

   E 23:51:00.232 *put* 'TYPE I\r\n'

   E 23:51:00.232 *get* '200 Type set to I.\r\n'

   E 23:51:00.232 *resp* '200 Type set to I.'

   E 23:51:00.232 *cmd* 'PASV'

   E 23:51:00.232 *put* 'PASV\r\n'

   E 23:51:00.232 *get* '227 Entering Passive Mode (216,35,233,26,7,176)\r\n'

   E 23:51:00.232 *resp* '227 Entering Passive Mode (216,35,233,26,7,176)'

   I 23:51:00.236 This request caused a new process to be started for your application, and thus caused your application code to be loaded for the first time. This request may thus take longer and use more CPU than a typical request for your application.

Answer 1

你可以进行外部连接，但可能会遇到一些限制。

首先

1 billing must be enabled
2. there are strict timeouts
3. some restrictions in destinations and ports.
4. And if you run this from a frontend request, then you will need to do all your work inside 60 second.
5. no inbound sockets.

关于具体的超时时间，需要进一步调查。你可能会被阻止。理论上，PASV模式的FTP应该可以用，但普通的FTP就不行。我还没有尝试过这个。