author | Sverre Rabbelier <srabbelier@gmail.com> |
Wed, 08 Apr 2009 22:19:05 +0000 | |
changeset 2127 | 1a0167169af3 |
parent 828 | f5fd65cc3bf3 |
child 2413 | d0b7dac5325c |
permissions | -rwxr-xr-x |
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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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"""Container of APIProxy stubs for more convenient unittesting. |
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Classes/variables/functions defined here: |
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APIProxyStubMap: container of APIProxy stubs. |
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apiproxy: global instance of an APIProxyStubMap. |
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MakeSyncCall: APIProxy entry point. |
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""" |
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import inspect |
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import sys |
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def CreateRPC(service): |
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"""Creates a RPC instance for the given service. |
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The instance is suitable for talking to remote services. |
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Each RPC instance can be used only once, and should not be reused. |
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Args: |
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service: string representing which service to call. |
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Returns: |
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the rpc object. |
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Raises: |
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AssertionError or RuntimeError if the stub for service doesn't supply a |
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CreateRPC method. |
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""" |
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stub = apiproxy.GetStub(service) |
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assert stub, 'No api proxy found for service "%s"' % service |
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assert hasattr(stub, 'CreateRPC'), ('The service "%s" doesn\'t have ' + |
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'a CreateRPC method.' % service) |
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return stub.CreateRPC() |
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def MakeSyncCall(service, call, request, response): |
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"""The APIProxy entry point for a synchronous API call. |
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Args: |
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service: string representing which service to call |
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call: string representing which function to call |
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request: protocol buffer for the request |
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response: protocol buffer for the response |
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Raises: |
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apiproxy_errors.Error or a subclass. |
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""" |
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apiproxy.MakeSyncCall(service, call, request, response) |
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class ListOfHooks(object): |
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"""An ordered collection of hooks for a particular API call. |
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A hook is a function that has exactly the same signature as |
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a service stub. It will be called before or after an api hook is |
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executed, depending on whether this list is for precall of postcall hooks. |
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Hooks can be used for debugging purposes (check certain |
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pre- or postconditions on api calls) or to apply patches to protocol |
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buffers before/after a call gets submitted. |
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""" |
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def __init__(self): |
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"""Constructor.""" |
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self.__content = [] |
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self.__unique_keys = set() |
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def __len__(self): |
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"""Returns the amount of elements in the collection.""" |
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return self.__content.__len__() |
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def __Insert(self, index, key, function, service=None): |
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"""Appends a hook at a certain position in the list. |
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Args: |
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index: the index of where to insert the function |
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key: a unique key (within the module) for this particular function. |
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If something from the same module with the same key is already |
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registered, nothing will be added. |
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function: the hook to be added. |
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service: optional argument that restricts the hook to a particular api |
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Returns: |
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True if the collection was modified. |
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""" |
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unique_key = (key, inspect.getmodule(function)) |
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if unique_key in self.__unique_keys: |
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109 |
return False |
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self.__content.insert(index, (key, function, service)) |
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self.__unique_keys.add(unique_key) |
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return True |
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113 |
|
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def Append(self, key, function, service=None): |
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"""Appends a hook at the end of the list. |
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116 |
|
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Args: |
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key: a unique key (within the module) for this particular function. |
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If something from the same module with the same key is already |
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registered, nothing will be added. |
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function: the hook to be added. |
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service: optional argument that restricts the hook to a particular api |
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123 |
|
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Returns: |
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True if the collection was modified. |
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""" |
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return self.__Insert(len(self), key, function, service) |
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|
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def Push(self, key, function, service=None): |
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"""Inserts a hook at the beginning of the list. |
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131 |
|
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132 |
Args: |
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key: a unique key (within the module) for this particular function. |
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If something from the same module with the same key is already |
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registered, nothing will be added. |
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function: the hook to be added. |
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service: optional argument that restricts the hook to a particular api |
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138 |
|
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Returns: |
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True if the collection was modified. |
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""" |
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return self.__Insert(0, key, function, service) |
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|
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def Clear(self): |
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"""Removes all hooks from the list (useful for unit tests).""" |
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self.__content = [] |
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self.__unique_keys = set() |
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|
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def Call(self, service, call, request, response): |
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"""Invokes all hooks in this collection. |
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151 |
|
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Args: |
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service: string representing which service to call |
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call: string representing which function to call |
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request: protocol buffer for the request |
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response: protocol buffer for the response |
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""" |
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for key, function, srv in self.__content: |
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if srv is None or srv == service: |
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160 |
function(service, call, request, response) |
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161 |
|
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162 |
|
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class APIProxyStubMap: |
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"""Container of APIProxy stubs for more convenient unittesting. |
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165 |
|
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Stubs may be either trivial implementations of APIProxy services (e.g. |
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167 |
DatastoreFileStub, UserServiceStub) or "real" implementations. |
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168 |
|
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169 |
For unittests, we may want to mix and match real and trivial implementations |
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170 |
of services in order to better focus testing on individual service |
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171 |
implementations. To achieve this, we allow the client to attach stubs to |
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172 |
service names, as well as define a default stub to be used if no specific |
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173 |
matching stub is identified. |
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174 |
""" |
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175 |
|
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176 |
|
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177 |
def __init__(self, default_stub=None): |
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"""Constructor. |
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179 |
|
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180 |
Args: |
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181 |
default_stub: optional stub |
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182 |
|
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183 |
'default_stub' will be used whenever no specific matching stub is found. |
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184 |
""" |
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185 |
self.__stub_map = {} |
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186 |
self.__default_stub = default_stub |
828
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187 |
self.__precall_hooks = ListOfHooks() |
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188 |
self.__postcall_hooks = ListOfHooks() |
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189 |
|
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190 |
def GetPreCallHooks(self): |
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191 |
"""Gets a collection for all precall hooks.""" |
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192 |
return self.__precall_hooks |
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193 |
|
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194 |
def GetPostCallHooks(self): |
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"""Gets a collection for all precall hooks.""" |
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196 |
return self.__postcall_hooks |
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197 |
|
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198 |
def RegisterStub(self, service, stub): |
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199 |
"""Register the provided stub for the specified service. |
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200 |
|
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201 |
Args: |
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202 |
service: string |
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203 |
stub: stub |
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204 |
""" |
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205 |
assert not self.__stub_map.has_key(service) |
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206 |
self.__stub_map[service] = stub |
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207 |
|
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208 |
if service == 'datastore': |
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self.RegisterStub('datastore_v3', stub) |
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|
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def GetStub(self, service): |
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"""Retrieve the stub registered for the specified service. |
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|
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Args: |
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service: string |
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|
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Returns: |
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stub |
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|
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Returns the stub registered for 'service', and returns the default stub |
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if no such stub is found. |
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""" |
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return self.__stub_map.get(service, self.__default_stub) |
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|
828
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def MakeSyncCall(self, service, call, request, response): |
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"""The APIProxy entry point. |
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|
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Args: |
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service: string representing which service to call |
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call: string representing which function to call |
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request: protocol buffer for the request |
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response: protocol buffer for the response |
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|
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Raises: |
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apiproxy_errors.Error or a subclass. |
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""" |
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stub = self.GetStub(service) |
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assert stub, 'No api proxy found for service "%s"' % service |
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self.__precall_hooks.Call(service, call, request, response) |
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stub.MakeSyncCall(service, call, request, response) |
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self.__postcall_hooks.Call(service, call, request, response) |
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|
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|
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def GetDefaultAPIProxy(): |
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try: |
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runtime = __import__('google.appengine.runtime', globals(), locals(), |
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['apiproxy']) |
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return APIProxyStubMap(runtime.apiproxy) |
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except (AttributeError, ImportError): |
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return APIProxyStubMap() |
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|
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apiproxy = GetDefaultAPIProxy() |