author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Wed, 28 Jan 2009 11:26:47 +0000 | |
changeset 1032 | ed83d42d1ed7 |
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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"""Primitives for dealing with datastore indexes. |
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Example index.yaml file: |
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------------------------ |
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indexes: |
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- kind: Cat |
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ancestor: no |
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properties: |
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- name: name |
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- name: age |
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direction: desc |
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- kind: Cat |
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properties: |
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- name: name |
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direction: ascending |
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- name: whiskers |
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direction: descending |
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- kind: Store |
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ancestor: yes |
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properties: |
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- name: business |
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direction: asc |
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- name: owner |
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direction: asc |
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""" |
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from google.appengine.api import datastore_types |
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from google.appengine.api import validation |
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from google.appengine.api import yaml_errors |
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from google.appengine.api import yaml_object |
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from google.appengine.datastore import datastore_pb |
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class Property(validation.Validated): |
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"""Representation for an individual property of an index. |
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Attributes: |
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name: Name of attribute to sort by. |
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direction: Direction of sort. |
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""" |
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ATTRIBUTES = { |
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'name': validation.TYPE_STR, |
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'direction': validation.Options(('asc', ('ascending',)), |
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('desc', ('descending',)), |
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default='asc'), |
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} |
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class Index(validation.Validated): |
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"""Individual index definition. |
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Order of the properties properties determins a given indixes sort priority. |
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Attributes: |
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kind: Datastore kind that index belongs to. |
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ancestors: Include ancestors in index. |
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properties: Properties to sort on. |
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""" |
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ATTRIBUTES = { |
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'kind': validation.TYPE_STR, |
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'ancestor': validation.Type(bool, default=False), |
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'properties': validation.Optional(validation.Repeated(Property)), |
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} |
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class IndexDefinitions(validation.Validated): |
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"""Top level for index definition file. |
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Attributes: |
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indexes: List of Index definitions. |
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""" |
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ATTRIBUTES = { |
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'indexes': validation.Optional(validation.Repeated(Index)), |
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} |
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def ParseIndexDefinitions(document): |
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"""Parse an individual index definitions document from string or stream. |
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Args: |
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document: Yaml document as a string or file-like stream. |
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Raises: |
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EmptyConfigurationFile when the configuration file is empty. |
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MultipleConfigurationFile when the configuration file contains more than |
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one document. |
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Returns: |
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117 |
Single parsed yaml file if one is defined, else None. |
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118 |
""" |
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119 |
try: |
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120 |
return yaml_object.BuildSingleObject(IndexDefinitions, document) |
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121 |
except yaml_errors.EmptyConfigurationFile: |
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122 |
return None |
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123 |
|
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124 |
|
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125 |
def ParseMultipleIndexDefinitions(document): |
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"""Parse multiple index definitions documents from a string or stream. |
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127 |
|
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128 |
Args: |
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document: Yaml document as a string or file-like stream. |
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130 |
|
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131 |
Returns: |
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A list of datstore_index.IndexDefinitions objects, one for each document. |
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133 |
""" |
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134 |
return yaml_object.BuildObjects(IndexDefinitions, document) |
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135 |
|
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136 |
|
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137 |
def IndexDefinitionsToKeys(indexes): |
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"""Convert IndexDefinitions to set of keys. |
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139 |
|
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140 |
Args: |
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141 |
indexes: A datastore_index.IndexDefinitions instance, or None. |
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142 |
|
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143 |
Returns: |
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144 |
A set of keys constructed from the argument, each key being a |
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tuple of the form (kind, ancestor, properties) where properties is |
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a tuple of (name, direction) pairs, direction being ASCENDING or |
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DESCENDING (the enums). |
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148 |
""" |
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149 |
keyset = set() |
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150 |
if indexes is not None: |
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151 |
if indexes.indexes: |
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152 |
for index in indexes.indexes: |
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keyset.add(IndexToKey(index)) |
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154 |
return keyset |
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155 |
|
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156 |
|
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157 |
def IndexToKey(index): |
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158 |
"""Convert Index to key. |
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159 |
|
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160 |
Args: |
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161 |
index: A datastore_index.Index instance (not None!). |
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162 |
|
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163 |
Returns: |
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164 |
A tuple of the form (kind, ancestor, properties) where properties |
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165 |
is a tuple of (name, direction) pairs, direction being ASCENDING |
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166 |
or DESCENDING (the enums). |
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167 |
""" |
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168 |
props = [] |
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169 |
if index.properties is not None: |
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170 |
for prop in index.properties: |
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171 |
if prop.direction == 'asc': |
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172 |
direction = ASCENDING |
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173 |
else: |
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174 |
direction = DESCENDING |
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175 |
props.append((prop.name, direction)) |
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176 |
return index.kind, index.ancestor, tuple(props) |
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177 |
|
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178 |
|
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179 |
|
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180 |
|
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181 |
ASCENDING = datastore_pb.Query_Order.ASCENDING |
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182 |
DESCENDING = datastore_pb.Query_Order.DESCENDING |
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183 |
|
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184 |
EQUALITY_OPERATORS = set((datastore_pb.Query_Filter.EQUAL, |
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185 |
)) |
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186 |
INEQUALITY_OPERATORS = set((datastore_pb.Query_Filter.LESS_THAN, |
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187 |
datastore_pb.Query_Filter.LESS_THAN_OR_EQUAL, |
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188 |
datastore_pb.Query_Filter.GREATER_THAN, |
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189 |
datastore_pb.Query_Filter.GREATER_THAN_OR_EQUAL, |
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190 |
)) |
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191 |
EXISTS_OPERATORS = set((datastore_pb.Query_Filter.EXISTS, |
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192 |
)) |
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193 |
|
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194 |
|
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195 |
def CompositeIndexForQuery(query): |
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196 |
"""Return the composite index needed for a query. |
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197 |
|
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198 |
A query is translated into a tuple, as follows: |
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199 |
|
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200 |
- The first item is the kind string, or None if we're not filtering |
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201 |
on kind (see below). |
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202 |
|
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203 |
- The second item is a bool giving whether the query specifies an |
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204 |
ancestor. |
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205 |
|
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206 |
- After that come (property, ASCENDING) pairs for those Filter |
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207 |
entries whose operator is EQUAL or IN. Since the order of these |
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208 |
doesn't matter, they are sorted by property name to normalize them |
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209 |
in order to avoid duplicates. |
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210 |
|
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211 |
- After that comes at most one (property, ASCENDING) pair for a |
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212 |
Filter entry whose operator is on of the four inequalities. There |
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213 |
can be at most one of these. |
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214 |
|
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215 |
- After that come all the (property, direction) pairs for the Order |
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216 |
entries, in the order given in the query. Exceptions: (a) if |
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217 |
there is a Filter entry with an inequality operator that matches |
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218 |
the first Order entry, the first order pair is omitted (or, |
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219 |
equivalently, in this case the inequality pair is omitted); (b) if |
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220 |
an Order entry corresponds to an equality filter, it is ignored |
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221 |
(since there will only ever be one value returned). |
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222 |
|
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223 |
- Finally, if there are Filter entries whose operator is EXISTS, and |
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224 |
whose property names are not already listed, they are added, with |
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225 |
the direction set to ASCENDING. |
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226 |
|
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227 |
This algorithm should consume all Filter and Order entries. |
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228 |
|
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229 |
Additional notes: |
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230 |
|
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231 |
- The low-level implementation allows queries that don't specify a |
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changeset
|
232 |
kind; but the Python API doesn't support this yet. |
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changeset
|
233 |
|
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changeset
|
234 |
- If there's an inequality filter and one or more sort orders, the |
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diff
changeset
|
235 |
first sort order *must* match the inequality filter. |
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parents:
diff
changeset
|
236 |
|
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changeset
|
237 |
- The following indexes are always built in and should be suppressed: |
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parents:
diff
changeset
|
238 |
- query on kind only; |
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diff
changeset
|
239 |
- query on kind and one filter *or* one order; |
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parents:
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|
240 |
- query on ancestor only, without kind (not exposed in Python yet); |
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parents:
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changeset
|
241 |
- query on kind and equality filters only, no order (with or without |
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|
242 |
ancestor). |
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parents:
diff
changeset
|
243 |
|
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parents:
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changeset
|
244 |
- While the protocol buffer allows a Filter to contain multiple |
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parents:
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changeset
|
245 |
properties, we don't use this. It is only needed for the IN operator |
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parents:
diff
changeset
|
246 |
but this is (currently) handled on the client side, so in practice |
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|
247 |
each Filter is expected to have exactly one property. |
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|
248 |
|
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|
249 |
Args: |
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|
250 |
query: A datastore_pb.Query instance. |
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|
251 |
|
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|
252 |
Returns: |
686
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diff
changeset
|
253 |
A tuple of the form (required, kind, ancestor, (prop1, prop2, ...), neq): |
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diff
changeset
|
254 |
required: boolean, whether the index is required |
109
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|
255 |
kind: the kind or None; |
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|
256 |
ancestor: True if this is an ancestor query; |
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|
257 |
prop1, prop2, ...: tuples of the form (name, direction) where: |
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|
258 |
name: a property name; |
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|
259 |
direction: datastore_pb.Query_Order.ASCENDING or ...DESCENDING; |
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|
260 |
neq: the number of prop tuples corresponding to equality filters. |
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|
261 |
""" |
686
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diff
changeset
|
262 |
required = True |
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parents:
109
diff
changeset
|
263 |
|
109
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parents:
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|
264 |
kind = query.kind() |
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|
265 |
ancestor = query.has_ancestor() |
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parents:
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|
266 |
filters = query.filter_list() |
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parents:
diff
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|
267 |
orders = query.order_list() |
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parents:
diff
changeset
|
268 |
|
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changeset
|
269 |
for filter in filters: |
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|
270 |
assert filter.op() != datastore_pb.Query_Filter.IN, 'Filter.op()==IN' |
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|
271 |
nprops = len(filter.property_list()) |
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|
272 |
assert nprops == 1, 'Filter has %s properties, expected 1' % nprops |
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|
273 |
|
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changeset
|
274 |
if ancestor and not kind and not filters and not orders: |
686
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diff
changeset
|
275 |
required = False |
109
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|
276 |
|
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|
277 |
eq_filters = [f for f in filters if f.op() in EQUALITY_OPERATORS] |
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|
278 |
ineq_filters = [f for f in filters if f.op() in INEQUALITY_OPERATORS] |
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|
279 |
exists_filters = [f for f in filters if f.op() in EXISTS_OPERATORS] |
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|
280 |
assert (len(eq_filters) + len(ineq_filters) + |
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parents:
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|
281 |
len(exists_filters)) == len(filters), 'Not all filters used' |
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parents:
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changeset
|
282 |
|
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parents:
diff
changeset
|
283 |
if (kind and eq_filters and not ineq_filters and not exists_filters and |
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parents:
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|
284 |
not orders): |
686
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parents:
109
diff
changeset
|
285 |
names = set(f.property(0).name() for f in eq_filters) |
df109be0567c
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parents:
109
diff
changeset
|
286 |
if not names.intersection(datastore_types._SPECIAL_PROPERTIES): |
df109be0567c
Load ../../google_appengine_1.1.7/ into
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parents:
109
diff
changeset
|
287 |
required = False |
109
620f9b141567
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parents:
diff
changeset
|
288 |
|
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
289 |
ineq_property = None |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
290 |
if ineq_filters: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
291 |
ineq_property = ineq_filters[0].property(0).name() |
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
292 |
for filter in ineq_filters: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
293 |
assert filter.property(0).name() == ineq_property |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
294 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
295 |
new_orders = [] |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
296 |
for order in orders: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
297 |
name = order.property() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
diff
changeset
|
298 |
for filter in eq_filters: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
299 |
if filter.property(0).name() == name: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
300 |
break |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
301 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
302 |
new_orders.append(order) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
303 |
orders = new_orders |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
304 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
305 |
props = [] |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
306 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
307 |
for f in eq_filters: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
308 |
prop = f.property(0) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
309 |
props.append((prop.name(), ASCENDING)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
310 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
311 |
props.sort() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
312 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
313 |
if ineq_property: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
314 |
if orders: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
315 |
assert ineq_property == orders[0].property() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
316 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
317 |
props.append((ineq_property, ASCENDING)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
318 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
319 |
for order in orders: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
320 |
props.append((order.property(), order.direction())) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
321 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
322 |
for filter in exists_filters: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
323 |
prop = filter.property(0) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
324 |
prop_name = prop.name() |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
325 |
for name, direction in props: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
326 |
if name == prop_name: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
327 |
break |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
328 |
else: |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
329 |
props.append((prop_name, ASCENDING)) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
330 |
|
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
331 |
if (kind and not ancestor and |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
332 |
(not props or (len(props) == 1 and props[0][1] == ASCENDING))): |
686
df109be0567c
Load ../../google_appengine_1.1.7/ into
Sverre Rabbelier <srabbelier@gmail.com>
parents:
109
diff
changeset
|
333 |
required = False |
109
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
334 |
|
828
f5fd65cc3bf3
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
686
diff
changeset
|
335 |
if props: |
f5fd65cc3bf3
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
686
diff
changeset
|
336 |
prop, dir = props[0] |
f5fd65cc3bf3
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
686
diff
changeset
|
337 |
if prop in datastore_types._SPECIAL_PROPERTIES and dir is DESCENDING: |
f5fd65cc3bf3
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
686
diff
changeset
|
338 |
required = True |
f5fd65cc3bf3
Load /Users/solydzajs/Downloads/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
686
diff
changeset
|
339 |
|
109
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
340 |
unique_names = set(name for name, dir in props) |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
341 |
if len(props) > 1 and len(unique_names) == 1: |
686
df109be0567c
Load ../../google_appengine_1.1.7/ into
Sverre Rabbelier <srabbelier@gmail.com>
parents:
109
diff
changeset
|
342 |
required = False |
109
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
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return (required, kind, ancestor, tuple(props), len(eq_filters)) |
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|
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|
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def IndexYamlForQuery(kind, ancestor, props): |
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"""Return the composite index definition YAML needed for a query. |
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349 |
|
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The arguments are the same as the tuples returned by CompositeIndexForQuery, |
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without the last neq element. |
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352 |
|
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Args: |
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kind: the kind or None |
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ancestor: True if this is an ancestor query, False otherwise |
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prop1, prop2, ...: tuples of the form (name, direction) where: |
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name: a property name; |
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direction: datastore_pb.Query_Order.ASCENDING or ...DESCENDING; |
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359 |
|
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Returns: |
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A string with the YAML for the composite index needed by the query. |
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""" |
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yaml = [] |
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yaml.append('- kind: %s' % kind) |
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if ancestor: |
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yaml.append(' ancestor: yes') |
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if props: |
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yaml.append(' properties:') |
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for name, direction in props: |
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yaml.append(' - name: %s' % name) |
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if direction == DESCENDING: |
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yaml.append(' direction: desc') |
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return '\n'.join(yaml) |