def run_on_appengine(gdata_service, store_tokens=True,
single_user_mode=False, deadline=None):
"""Modifies a GDataService object to allow it to run on App Engine.
Args:
gdata_service: An instance of AtomService, GDataService, or any
of their subclasses which has an http_client member and a
token_store member.
store_tokens: Boolean, defaults to True. If True, the gdata_service
will attempt to add each token to it's token_store when
SetClientLoginToken or SetAuthSubToken is called. If False
the tokens will not automatically be added to the
token_store.
single_user_mode: Boolean, defaults to False. If True, the current_token
member of gdata_service will be set when
SetClientLoginToken or SetAuthTubToken is called. If set
to True, the current_token is set in the gdata_service
and anyone who accesses the object will use the same
token.
Note: If store_tokens is set to False and
single_user_mode is set to False, all tokens will be
ignored, since the library assumes: the tokens should not
be stored in the datastore and they should not be stored
in the gdata_service object. This will make it
impossible to make requests which require authorization.
deadline: int (optional) The number of seconds to wait for a response
before timing out on the HTTP request. If no deadline is
specified, the deafault deadline for HTTP requests from App
Engine is used. The maximum is currently 10 (for 10 seconds).
The default deadline for App Engine is 5 seconds.
"""
gdata_service.http_client = AppEngineHttpClient(deadline=deadline)
gdata_service.token_store = AppEngineTokenStore()
gdata_service.auto_store_tokens = store_tokens
gdata_service.auto_set_current_token = single_user_mode
return gdata_service
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