| author | Sverre Rabbelier <srabbelier@gmail.com> |
| Sat, 06 Dec 2008 16:52:21 +0000 | |
| changeset 686 | df109be0567c |
| parent 109 | 620f9b141567 |
| permissions | -rwxr-xr-x |
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parents:
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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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"""CGI for displaying info about the currently running app in dev_appserver. |
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This serves pages under /_ah/info/ that display information about the app |
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currently running in the dev_appserver. It currently serves on these URLs: |
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/_ah/info/queries: |
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A list of datastore queries run so far, grouped by kind. Used to suggest |
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composite indices that should be built. |
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/_ah/info/index.yaml: |
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Produces an index.yaml file that can be uploaded to the real app |
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server by appcfg.py. This information is derived from the query |
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history above, by removing queries that don't need any indexes to |
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be built and by combining queries that can use the same index. |
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""" |
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import cgi |
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import wsgiref.handlers |
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from google.appengine.api import apiproxy_stub_map |
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from google.appengine.datastore import datastore_pb |
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from google.appengine.ext import webapp |
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from google.appengine.tools import dev_appserver_index |
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class QueriesHandler(webapp.RequestHandler): |
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"""A handler that displays a list of the datastore queries run so far. |
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""" |
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HEADER = """<html> |
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<head><title>Query History</title></head> |
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<body> |
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<h3>Query History</h3> |
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<p>This is a list of datastore queries your app has run. You have to |
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make composite indices for these queries before deploying your app. |
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This is normally done automatically by running dev_appserver, which |
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will write the file index.yaml into your app's root directory, and |
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then deploying your app with appcfg, which will upload that |
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index.yaml.</p> |
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<p>You can also view a 'clean' <a href="index.yaml">index.yaml</a> |
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file and save that to your app's root directory.</p> |
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<table> |
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<tr><th>Times run</th><th>Query</th></tr> |
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""" |
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ROW = """<tr><td>%(count)s</td><td>%(query)s</td></tr>""" |
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FOOTER = """ |
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</table> |
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</body> |
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</html>""" |
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def Render(self): |
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"""Renders and returns the query history page HTML. |
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Returns: |
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A string, formatted as an HTML page. |
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""" |
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history = apiproxy_stub_map.apiproxy.GetStub('datastore_v3').QueryHistory()
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history_items = [(count, query) for query, count in history.items()] |
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history_items.sort(reverse=True) |
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rows = [self.ROW % {'query': _FormatQuery(query),
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'count': count} |
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for count, query in history_items] |
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return self.HEADER + '\n'.join(rows) + self.FOOTER |
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def get(self): |
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"""Handle a GET. Just calls Render().""" |
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self.response.out.write(self.Render()) |
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class IndexYamlHandler(webapp.RequestHandler): |
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"""A handler that renders an index.yaml file suitable for upload.""" |
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def Render(self): |
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"""Renders and returns the index.yaml file. |
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Returns: |
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A string, formatted as an index.yaml file. |
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""" |
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datastore_stub = apiproxy_stub_map.apiproxy.GetStub('datastore_v3')
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query_history = datastore_stub.QueryHistory() |
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body = dev_appserver_index.GenerateIndexFromHistory(query_history) |
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return 'indexes:\n' + body |
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108 |
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109 |
def get(self): |
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110 |
"""Handle a GET. Just calls Render().""" |
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111 |
self.response.headers['Content-Type'] = 'text/plain' |
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self.response.out.write(self.Render()) |
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113 |
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114 |
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115 |
def _FormatQuery(query): |
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116 |
"""Format a Query protobuf as (very simple) HTML. |
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117 |
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118 |
Args: |
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119 |
query: A datastore_pb.Query instance. |
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120 |
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121 |
Returns: |
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A string containing formatted HTML. This is mostly the output of |
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123 |
str(query) with '<' etc. escaped, and '<br>' inserted in front of |
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124 |
Order and Filter parts. |
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125 |
""" |
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126 |
res = cgi.escape(str(query)) |
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res = res.replace('Order', '<br>Order')
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res = res.replace('Filter', '<br>Filter')
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129 |
return res |
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130 |
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131 |
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132 |
def _DirectionToString(direction): |
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133 |
"""Turn a direction enum into a string. |
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134 |
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135 |
Args: |
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136 |
direction: ASCENDING or DESCENDING |
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137 |
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138 |
Returns: |
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Either 'asc' or 'descending'. |
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140 |
""" |
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141 |
if direction == datastore_pb.Query_Order.DESCENDING: |
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142 |
return 'descending' |
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143 |
else: |
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144 |
return 'asc' |
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145 |
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146 |
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147 |
URL_MAP = {
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148 |
'/_ah/info/queries': QueriesHandler, |
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149 |
'/_ah/info/index.yaml': IndexYamlHandler, |
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150 |
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151 |
} |
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152 |
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153 |
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154 |
def main(): |
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155 |
application = webapp.WSGIApplication(URL_MAP.items()) |
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156 |
wsgiref.handlers.CGIHandler().run(application) |
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157 |
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158 |
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159 |
if __name__ == '__main__': |
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160 |
main() |