thirdparty/google_appengine/google/appengine/api/apiproxy_rpc.py
author Sverre Rabbelier <srabbelier@gmail.com>
Fri, 23 Oct 2009 13:54:11 -0500
changeset 3031 7678f72140e6
parent 2864 2e0b0af889be
permissions -rwxr-xr-x
Update Google App Engine from 1.2.5 to 1.2.7 in thirdparty folder.
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Base class for implementing RPC of API proxy stubs."""
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import sys
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class RPC(object):
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  """Base class for implementing RPC of API proxy stubs.
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  To implement a RPC to make real asynchronous API call:
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    - Extend this class.
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    - Override _MakeCallImpl and/or _WaitImpl to do a real asynchronous call.
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  """
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  IDLE = 0
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  RUNNING = 1
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  FINISHING = 2
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  def __init__(self, package=None, call=None, request=None, response=None,
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               callback=None, deadline=None, stub=None):
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    """Constructor for the RPC object.
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    All arguments are optional, and simply set members on the class.
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    These data members will be overriden by values passed to MakeCall.
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    Args:
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      package: string, the package for the call
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      call: string, the call within the package
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      request: ProtocolMessage instance, appropriate for the arguments
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      response: ProtocolMessage instance, appropriate for the response
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      callback: callable, called when call is complete
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      deadline: A double specifying the deadline for this call as the number of
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                seconds from the current time. Ignored if non-positive.
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      stub: APIProxyStub instance, used in default _WaitImpl to do real call
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    """
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    self.__exception = None
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    self.__state = RPC.IDLE
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    self.__traceback = None
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    self.package = package
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    self.call = call
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    self.request = request
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    self.response = response
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    self.callback = callback
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    self.deadline = deadline
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    self.stub = stub
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    self.cpu_usage_mcycles = 0
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  def MakeCall(self, package=None, call=None, request=None, response=None,
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               callback=None, deadline=None):
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    """Makes an asynchronous (i.e. non-blocking) API call within the
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    specified package for the specified call method.
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    It will call the _MakeRealCall to do the real job.
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    Args:
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      Same as constructor; see __init__.
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    Raises:
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      TypeError or AssertionError if an argument is of an invalid type.
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      AssertionError or RuntimeError is an RPC is already in use.
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    """
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    self.callback = callback or self.callback
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    self.package = package or self.package
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    self.call = call or self.call
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    self.request = request or self.request
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    self.response = response or self.response
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    self.deadline = deadline or self.deadline
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    assert self.__state is RPC.IDLE, ('RPC for %s.%s has already been started' %
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                                      (self.package, self.call))
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    assert self.callback is None or callable(self.callback)
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    self._MakeCallImpl()
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  def Wait(self):
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    """Waits on the API call associated with this RPC."""
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    rpc_completed = self._WaitImpl()
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    assert rpc_completed, ('RPC for %s.%s was not completed, and no other ' +
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                           'exception was raised ' % (self.package, self.call))
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  def CheckSuccess(self):
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    """If there was an exception, raise it now.
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    Raises:
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      Exception of the API call or the callback, if any.
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    """
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    if self.exception and self.__traceback:
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      raise self.exception.__class__, self.exception, self.__traceback
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    elif self.exception:
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      raise self.exception
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  @property
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  def exception(self):
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    return self.__exception
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  @property
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  def state(self):
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    return self.__state
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  def _MakeCallImpl(self):
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    """Override this method to implement a real asynchronous call rpc."""
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    self.__state = RPC.RUNNING
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  def _WaitImpl(self):
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    """Override this method to implement a real asynchronous call rpc.
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    Returns:
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      True if the async call was completed successfully.
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    """
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    try:
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      try:
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        self.stub.MakeSyncCall(self.package, self.call,
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                               self.request, self.response)
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      except Exception, e:
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        self.__exception = e
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    finally:
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      self.__state = RPC.FINISHING
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      self.__Callback()
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    return True
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  def __Callback(self):
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    if self.callback:
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      try:
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        self.callback()
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      except:
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        exc_class, self.__exception, self.__traceback = sys.exc_info()
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        self.__exception._appengine_apiproxy_rpc = self
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        raise