author | David Anderson <david.jc.anderson@gmail.com> |
Fri, 13 Mar 2009 02:13:21 +0000 | |
changeset 1825 | a610a2df83d2 |
parent 828 | f5fd65cc3bf3 |
permissions | -rwxr-xr-x |
828
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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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"""Allows applications to identify API outages and scheduled downtime. |
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Some examples: |
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def StoreUploadedProfileImage(self): |
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uploaded_image = self.request.get('img') |
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# If the images API is unavailable, we'll just skip the resize. |
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if CapabilitySet('images').is_enabled(): |
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uploaded_image = images.resize(uploaded_image, 64, 64) |
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store(uploaded_image) |
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def RenderHTMLForm(self): |
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datastore_readonly = CapabilitySet('datastore_v3', capabilities=['write']) |
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if datastore_readonly.may_be_disabled_in(60): |
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# self.response.out('<p>Not accepting submissions right now: %s</p>' % |
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datastore_readonly.admin_message()) |
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# ...render form with form elements disabled... |
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else: |
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# ...render form normally... |
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Individual API wrapper modules should expose CapabilitySet objects |
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for users rather than relying on users to create them. They may |
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also create convenience methods (e.g. db.IsReadOnly()) that delegate |
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to the relevant CapabilitySet. |
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Classes defined here: |
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CapabilitySet: encapsulates one or more capabilities, allows introspection. |
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UnknownCapabilityError: thrown when an unknown capability is requested. |
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""" |
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from google.appengine.api.capabilities import capability_service_pb |
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from google.appengine.base import capabilities_pb |
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from google.appengine.api import apiproxy_stub_map |
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IsEnabledRequest = capability_service_pb.IsEnabledRequest |
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IsEnabledResponse = capability_service_pb.IsEnabledResponse |
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CapabilityConfig = capabilities_pb.CapabilityConfig |
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class UnknownCapabilityError(Exception): |
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"""An unknown capability was requested.""" |
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class CapabilitySet(object): |
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"""Encapsulates one or more capabilities. |
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Capabilities can either be named explicitly, or inferred from the |
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list of methods provided. If no capabilities or methods are |
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provided, this will check whether the entire package is enabled. |
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""" |
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def __init__(self, package, capabilities=None, methods=None, |
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stub_map=apiproxy_stub_map): |
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"""Constructor. |
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Args: |
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capabilities: list of strings |
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methods: list of strings |
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""" |
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if capabilities is None: |
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capabilities = [] |
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if methods is None: |
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methods = [] |
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self._package = package |
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self._capabilities = ['*'] + capabilities |
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self._methods = methods |
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self._stub_map = stub_map |
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def is_enabled(self): |
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"""Tests whether the capabilities is currently enabled. |
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Returns: |
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True if API calls that require these capabillities will succeed. |
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Raises: |
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UnknownCapabilityError, if a specified capability was not recognized. |
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""" |
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config = self._get_status() |
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return config.summary_status() in (IsEnabledResponse.ENABLED, |
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IsEnabledResponse.SCHEDULED_FUTURE, |
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IsEnabledResponse.SCHEDULED_NOW) |
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|
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|
103 |
def will_remain_enabled_for(self, time=60): |
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|
104 |
"""Returns true if it will remain enabled for the specified amount of time. |
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|
105 |
|
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|
106 |
Args: |
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|
107 |
time: Number of seconds in the future to look when checking for scheduled |
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|
108 |
downtime. |
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|
109 |
|
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110 |
Returns: |
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|
111 |
True if there is no scheduled downtime for the specified capability |
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|
112 |
within the amount of time specified. |
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|
113 |
|
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|
114 |
Raises: |
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|
115 |
UnknownCapabilityError, if a specified capability was not recognized. |
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|
116 |
""" |
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117 |
config = self._get_status() |
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118 |
|
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119 |
status = config.summary_status() |
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120 |
if status == IsEnabledResponse.ENABLED: |
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121 |
return True |
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122 |
elif status == IsEnabledResponse.SCHEDULED_NOW: |
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123 |
return False |
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124 |
elif status == IsEnabledResponse.SCHEDULED_FUTURE: |
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125 |
if config.has_time_until_scheduled(): |
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126 |
return config.time_until_scheduled() >= time |
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127 |
else: |
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128 |
return True |
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129 |
elif status == IsEnabledResponse.DISABLED: |
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130 |
return False |
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131 |
else: |
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132 |
return False |
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|
133 |
|
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|
134 |
def admin_message(self): |
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|
135 |
"""Get any administrator notice messages for these capabilities. |
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|
136 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
137 |
Returns: |
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|
138 |
A string containing one or more admin messages, or an empty string. |
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|
139 |
|
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|
140 |
Raises: |
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parents:
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|
141 |
UnknownCapabilityError, if a specified capability was not recognized. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
142 |
""" |
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|
143 |
message_list = [] |
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|
144 |
for config in self._get_status().config_list(): |
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|
145 |
message = config.admin_message() |
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|
146 |
if message and message not in message_list: |
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|
147 |
message_list.append(message) |
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|
148 |
return ' '.join(message_list) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
149 |
|
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|
150 |
def _get_status(self): |
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|
151 |
"""Get an IsEnabledResponse for the capabilities listed. |
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|
152 |
|
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|
153 |
Returns: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
154 |
IsEnabledResponse for the specified capabilities. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
155 |
|
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
156 |
Raises: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
157 |
UnknownCapabilityError: If an unknown capability was requested. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
158 |
""" |
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|
159 |
req = IsEnabledRequest() |
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|
160 |
req.set_package(self._package) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
161 |
for capability in self._capabilities: |
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|
162 |
req.add_capability(capability) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
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|
163 |
for method in self._methods: |
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|
164 |
req.add_call(method) |
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|
165 |
|
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|
166 |
resp = capability_service_pb.IsEnabledResponse() |
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|
167 |
self._stub_map.MakeSyncCall('capability_service', 'IsEnabled', req, resp) |
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|
168 |
|
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|
169 |
if resp.summary_status() == IsEnabledResponse.UNKNOWN: |
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|
170 |
raise UnknownCapabilityError() |
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|
171 |
|
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|
172 |
return resp |