Started on edit timeline
Added a gsoc timeline logic module. Also added a scope_path as the
key_field to timeline. Updated the django_paterns to only include
the edit field and removed link_id as dynafield.
Patch by: Sverre Rabbelier
#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Makes API calls to various Google-provided services.
Provides methods for making calls into Google Apphosting services and APIs
from your application code. This code will only work properly from within
the Google Apphosting environment.
"""
import sys
from google.net.proto import ProtocolBuffer
from google.appengine import runtime
from google.appengine.runtime import apiproxy_errors
from google3.apphosting.runtime import _apphosting_runtime___python__apiproxy
OK = 0
RPC_FAILED = 1
CALL_NOT_FOUND = 2
ARGUMENT_ERROR = 3
DEADLINE_EXCEEDED = 4
CANCELLED = 5
APPLICATION_ERROR = 6
OTHER_ERROR = 7
OVER_QUOTA = 8
REQUEST_TOO_LARGE = 9
CAPABILITY_DISABLED = 10
_ExceptionsMap = {
RPC_FAILED:
(apiproxy_errors.RPCFailedError,
"The remote RPC to the application server failed for the call %s.%s()."),
CALL_NOT_FOUND:
(apiproxy_errors.CallNotFoundError,
"The API package '%s' or call '%s()' was not found."),
ARGUMENT_ERROR:
(apiproxy_errors.ArgumentError,
"An error occurred parsing (locally or remotely) the arguments to %s.%s()."),
DEADLINE_EXCEEDED:
(apiproxy_errors.DeadlineExceededError,
"The API call %s.%s() took too long to respond and was cancelled."),
CANCELLED:
(apiproxy_errors.CancelledError,
"The API call %s.%s() was explicitly cancelled."),
OTHER_ERROR:
(apiproxy_errors.Error,
"An error occurred for the API request %s.%s()."),
OVER_QUOTA:
(apiproxy_errors.OverQuotaError,
"The API call %s.%s() required more quota than is available."),
REQUEST_TOO_LARGE:
(apiproxy_errors.RequestTooLargeError,
"The request to API call %s.%s() was too large."),
}
class RPC(object):
"""A RPC object, suitable for talking to remote services.
Each instance of this object can be used only once, and should not be reused.
Stores the data members and methods for making RPC calls via the APIProxy.
"""
IDLE = 0
RUNNING = 1
FINISHING = 2
def __init__(self, package=None, call=None, request=None, response=None,
callback=None):
"""Constructor for the RPC object. All arguments are optional, and
simply set members on the class. These data members will be
overriden by values passed to MakeCall.
Args:
package: string, the package for the call
call: string, the call within the package
request: ProtocolMessage instance, appropriate for the arguments
response: ProtocolMessage instance, appropriate for the response
callback: callable, called when call is complete
"""
self.__exception = None
self.__traceback = None
self.__result_dict = {}
self.__state = RPC.IDLE
self.package = package
self.call = call
self.request = request
self.response = response
self.callback = callback
def MakeCall(self, package=None, call=None, request=None, response=None,
callback=None):
"""Makes an asynchronous (i.e. non-blocking) API call within the
specified package for the specified call method. request and response must
be the appropriately typed ProtocolBuffers for the API call.
callback, if provided, will be called when the request completes
successfully or when an error occurs. If an error has ocurred, the
exception() method on this class will return the error, which can be
accessed from the callback.
Args:
Same as constructor; see __init__.
Raises:
TypeError or AssertionError if an argument is of an invalid type.
AssertionError or RuntimeError is an RPC is already in use.
"""
self.callback = callback or self.callback
self.package = package or self.package
self.call = call or self.call
self.request = request or self.request
self.response = response or self.response
assert self.__state is RPC.IDLE, ("RPC for %s.%s has already been started" %
(self.package, self.call))
assert self.callback is None or callable(self.callback)
assert isinstance(self.request, ProtocolBuffer.ProtocolMessage)
assert isinstance(self.response, ProtocolBuffer.ProtocolMessage)
e = ProtocolBuffer.Encoder()
self.request.Output(e)
self.__state = RPC.RUNNING
_apphosting_runtime___python__apiproxy.MakeCall(
self.package, self.call, e.buffer(), self.__result_dict,
self.__MakeCallDone, self)
def Wait(self):
"""Waits on the API call associated with this RPC. The callback,
if provided, will be executed before Wait() returns. If this RPC
is already complete, or if the RPC was never started, this
function will return immediately.
Raises:
InterruptedError if a callback throws an uncaught exception.
"""
try:
rpc_completed = _apphosting_runtime___python__apiproxy.Wait(self)
except runtime.DeadlineExceededError:
raise
except apiproxy_errors.InterruptedError:
raise
except:
exc_class, exc, tb = sys.exc_info()
if (isinstance(exc, SystemError) and
exc.args == ('uncaught RPC exception',)):
raise
rpc = None
if hasattr(exc, "_appengine_apiproxy_rpc"):
rpc = exc._appengine_apiproxy_rpc
new_exc = apiproxy_errors.InterruptedError(exc, rpc)
raise new_exc.__class__, new_exc, tb
assert rpc_completed, ("RPC for %s.%s was not completed, and no other " +
"exception was raised " % (self.package, self.call))
def CheckSuccess(self):
"""If there was an exception, raise it now.
Raises:
Exception of the API call or the callback, if any.
"""
if self.exception and self.__traceback:
raise self.exception.__class__, self.exception, self.__traceback
if self.exception:
raise self.exception
@property
def exception(self):
return self.__exception
@property
def state(self):
return self.__state
def __MakeCallDone(self):
self.__state = RPC.FINISHING
if self.__result_dict['error'] == APPLICATION_ERROR:
self.__exception = apiproxy_errors.ApplicationError(
self.__result_dict['application_error'],
self.__result_dict['error_detail'])
elif self.__result_dict['error'] == CAPABILITY_DISABLED:
if self.__result_dict['error_detail']:
self.__exception = apiproxy_errors.CapabilityDisabledError(
self.__result_dict['error_detail'])
else:
self.__exception = apiproxy_errors.CapabilityDisabledError(
"The API call %s.%s() is temporarily unavailable." % (
self.package, self.call))
elif _ExceptionsMap.has_key(self.__result_dict['error']):
exception_entry = _ExceptionsMap[self.__result_dict['error']]
self.__exception = exception_entry[0](
exception_entry[1] % (self.package, self.call))
else:
try:
self.response.ParseFromString(self.__result_dict['result_string'])
except Exception, e:
self.__exception = e
if self.callback:
try:
self.callback()
except:
exc_class, self.__exception, self.__traceback = sys.exc_info()
self.__exception._appengine_apiproxy_rpc = self
raise
def MakeSyncCall(package, call, request, response):
"""Makes a synchronous (i.e. blocking) API call within the specified
package for the specified call method. request and response must be the
appropriately typed ProtocolBuffers for the API call. An exception is
thrown if an error occurs when communicating with the system.
Args:
See MakeCall above.
Raises:
See CheckSuccess() above.
"""
rpc = RPC()
rpc.MakeCall(package, call, request, response)
rpc.Wait()
rpc.CheckSuccess()