I'm using imaplib
to query Gmail's IMAP, but some requests are taking more than 60 seconds to return. This is already done in a task, so I have a full 10 minutes to do the request, but my tasks are failing due to the 60 second limit on urlfetch
.
I've tried setting urlfetch.set_default_fetch_deadline(600)
, but it doesn't seem to do anything.
Here's a 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.
There are three kinds of DeadlineExceededError
in AppEngine.
https://developers.google.com/appengine/articles/deadlineexceedederrors
- google.appengine.runtime.DeadlineExceededError: raised if the overall request times out, typically after 60 seconds, or 10 minutes for task queue requests.
- google.appengine.runtime.apiproxy_errors.DeadlineExceededError: raised if an RPC exceeded its deadline. This is typically 5 seconds, but it is settable for some APIs using the 'deadline' option.
- google.appengine.api.urlfetch_errors.DeadlineExceededError: raised if the URLFetch times out.
As you can see. The 10mins limit of taskqueue
only help the google.appengine.runtime.DeadlineExceededError
. The type of DeadlineExceededError
can be identified via traceback (list below). In this case, it is google.appengine.runtime.apiproxy_errors.DeadlineExceededError
. Which will raise in 5secs by default. (I will update the post after figure out how to change it)
The traceback looks like
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
This exception can be solved by using taskqueue (10mins), backend or manual scaling options. https://developers.google.com/appengine/docs/python/modules/#Python_Instance_scaling_and_class
The traceback looks like
DeadlineExceededError: The API call remote_socket.Receive() took too long to respond and was cancelled.
The traceback looks like
DeadlineExceededError: Deadline exceeded while waiting for HTTP response from URL: http://www.sogi.com.tw/newforum/article_list.aspx?topic_ID=6089521
This exception can be solved by extend the deadline.
urlfetch.fetch(url, deadline=10*60)
https://developers.google.com/appengine/docs/python/urlfetch/fetchfunction
There's no mentioning of timeout in imaplib sources. So there are several options:
From the Google App Engine documentation , it seems like there are many possible causes for DeadlineExceededError
.
In your case, it seems that it may be one of the last two (out of three) types of DeadlineExceededError
presented on the page.
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