author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Thu, 29 Jan 2009 09:33:50 +0000 | |
changeset 1058 | 6acbbb68f032 |
parent 828 | f5fd65cc3bf3 |
child 1278 | a7766286a7be |
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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"""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, 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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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.stub = stub |
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def MakeCall(self, package=None, call=None, request=None, response=None, |
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callback=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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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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103 |
""" |
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104 |
if self.exception and self.__traceback: |
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105 |
raise self.exception.__class__, self.exception, self.__traceback |
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106 |
elif self.exception: |
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107 |
raise self.exception |
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108 |
|
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109 |
@property |
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110 |
def exception(self): |
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111 |
return self.__exception |
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112 |
|
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113 |
@property |
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114 |
def state(self): |
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115 |
return self.__state |
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116 |
|
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117 |
def _MakeCallImpl(self): |
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118 |
"""Override this method to implement a real asynchronous call rpc.""" |
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119 |
self.__state = RPC.RUNNING |
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120 |
|
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121 |
def _WaitImpl(self): |
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122 |
"""Override this method to implement a real asynchronous call rpc. |
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123 |
|
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124 |
Returns: |
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125 |
True if the async call was completed successfully. |
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126 |
""" |
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127 |
try: |
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128 |
try: |
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129 |
self.stub.MakeSyncCall(self.package, self.call, |
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130 |
self.request, self.response) |
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131 |
except Exception, e: |
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132 |
self.__exception = e |
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133 |
finally: |
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134 |
self.__state = RPC.FINISHING |
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135 |
self.__Callback() |
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136 |
|
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137 |
return True |
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138 |
|
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139 |
def __Callback(self): |
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140 |
if self.callback: |
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|
141 |
try: |
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142 |
self.callback() |
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|
143 |
except: |
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144 |
exc_class, self.__exception, self.__traceback = sys.exc_info() |
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145 |
self.__exception._appengine_apiproxy_rpc = self |
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146 |
raise |