Python 如何增加imaplib请求的超时？

我正在使用

imaplib

查询Gmail的IMAP，但有些请求需要60秒以上才能返回。这已在任务中完成，因此我有整整10分钟的时间来执行请求，但由于

urlfetch

上的60秒限制，我的任务失败

我试过设置

urlfetch.set\u default\u fetch\u deadline（600）

，但它似乎没有任何作用

这里有一个stacktrace：

The API call remote_socket.Receive() took too long to respond and was cancelled.
Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 760, in uid
    typ, dat = self._simple_command(name, command, *args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 1070, in _simple_command
    return self._command_complete(name, self._command(name, *args))
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 897, in _command_complete
    typ, data = self._get_tagged_response(tag)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 999, in _get_tagged_response
    self._get_response()
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 916, in _get_response
    resp = self._get_line()
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 1009, in _get_line
    line = self.readline()
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/imaplib.py", line 1171, in readline
    return self.file.readline()
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/socket.py", line 445, in readline
    data = self._sock.recv(self._rbufsize)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ssl.py", line 301, in recv
    return self.read(buflen)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ssl.py", line 220, in read
    return self._sslobj.read(len)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/remote_socket/_remote_socket.py", line 864, in recv
    return self.recvfrom(buffersize, flags)[0]
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/remote_socket/_remote_socket.py", line 903, in recvfrom
    apiproxy_stub_map.MakeSyncCall('remote_socket', 'Receive', request, reply)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 94, in MakeSyncCall
    return stubmap.MakeSyncCall(service, call, request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 328, in MakeSyncCall
    rpc.CheckSuccess()
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 133, in CheckSuccess
    raise self.exception
DeadlineExceededError: The API call remote_socket.Receive() took too long to respond and was cancelled.

---

imaplib源代码中没有提到超时。因此，有几种选择：

第二个选项是使用 可调超时，我们可以说在

从表面上看，似乎有很多

死线超出DederRor

的可能原因

在您的情况下，它可能是页面上显示的最后两种（三种类型中的一种）类型的

deadlineexceedderror

。

哪种类型的deadlineexceedderror？ AppEngine中有三种类型的

死线超出derror

。

google.appengine.runtime.DeadlineExceededError：如果整个请求超时，通常在60秒或10分钟后引发 用于任务队列请求

google.appengine.runtime.apiproxy_errors.deadlineExceederRor：如果RPC超过其截止日期，则引发。这通常是5秒， 但对于某些API，它可以使用“截止日期”选项进行设置

google.appengine.api.urlfetch_errors.DeadlineExceededError：如果urlfetch超时，则引发

如你所见。

taskqueue

的10分钟限制只对

google.appengine.runtime.DeadlineExceededError

有帮助。

死线超标错误的类型可以通过回溯（如下列表）进行识别。在本例中，它是
google.appengine.runtime.apiproxy\u errors.DeadlineExceededError
。默认情况下，它将在5秒内升高。（我会在弄清楚如何更改后更新帖子）

类型1。google.appengine.runtime.deadlineExceederRor
回溯看起来像

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 266, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~tagtooadex2/test.371204033771063679/index.py", line 9, in get
    pass
DeadlineExceededError

DeadlineExceededError: Deadline exceeded while waiting for HTTP response from URL:     http://www.sogi.com.tw/newforum/article_list.aspx?topic_ID=6089521

解决方案
使用taskqueue（10分钟）、后端或手动缩放选项可以解决此异常。

类型2。google.appengine.runtime.apiproxy_errors.deadlineExceederRor
回溯看起来像

DeadlineExceededError: The API call remote_socket.Receive() took too long to respond and was cancelled.

类型3。google.appengine.api.urlfetch_errors.deadlineExceederRor
回溯看起来像

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 266, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~tagtooadex2/test.371204033771063679/index.py", line 9, in get
    pass
DeadlineExceededError

DeadlineExceededError: Deadline exceeded while waiting for HTTP response from URL:     http://www.sogi.com.tw/newforum/article_list.aspx?topic_ID=6089521

解决方案：
这个例外可以通过延长截止日期来解决

urlfetch.fetch(url, deadline=10*60)

我不认为是套接字库超时了。(It)。似乎是阿彭尼把死线抛得太远了。所有请求限制为60秒。但由于我是在taskqueue中执行此操作，我应该有最多10分钟的时间来执行请求。我认为，您更希望添加一些代码来重现问题，这将增加您获得答案的机会。我尝试了imaplib，但无法重现错误。它可以一直执行到请求超时。类型2。问题是，没有（记录在案的）方法来设置套接字的超时。事实上，据文件记载，默认情况下套接字没有超时。所以我不明白为什么我的一些请求会在60秒内超时。一个谷歌的家伙说事实上imap端口被阻塞了。。。我试图访问gmail帐户，但没有收到IMAP4_SSL错误。如果您的imap服务器是gmail，请尝试：