90 lines
3.2 KiB
Python
90 lines
3.2 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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from sqlalchemy.orm import aliased
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from neutron.db.models import tag as tag_model
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def _get_tag_list(tag_strings):
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tags = set()
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for tag_str in tag_strings:
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tags |= set(tag_str.split(','))
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return list(tags)
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def apply_tag_filters(model, query, filters):
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"""Apply tag filters
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There are four types of filter:
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`tags` -- One or more strings that will be used to filter results
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in an AND expression: T1 AND T2
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`tags-any` -- One or more strings that will be used to filter results
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in an OR expression: T1 OR T2
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`not-tags` -- One or more strings that will be used to filter results
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in a NOT AND expression: NOT (T1 AND T2)
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`not-tags-any` -- One or more strings that will be used to filter results
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in a NOT OR expression: NOT (T1 OR T2)
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Note: tag values can be specified comma separated string.
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for example,
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'GET /v2.0/networks?tags-any=red,blue' is equivalent to
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'GET /v2.0/networks?tags-any=red&tags-any=blue'
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it means 'red' or 'blue'.
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"""
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if 'tags' in filters:
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tags = _get_tag_list(filters.pop('tags'))
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first_tag = tags.pop(0)
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query = query.join(tag_model.Tag,
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model.standard_attr_id == tag_model.Tag.standard_attr_id)
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query = query.filter(tag_model.Tag.tag == first_tag)
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for tag in tags:
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tag_alias = aliased(tag_model.Tag)
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query = query.join(tag_alias,
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model.standard_attr_id == tag_alias.standard_attr_id)
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query = query.filter(tag_alias.tag == tag)
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if 'tags-any' in filters:
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tags = _get_tag_list(filters.pop('tags-any'))
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query = query.join(tag_model.Tag,
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model.standard_attr_id == tag_model.Tag.standard_attr_id)
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query = query.filter(tag_model.Tag.tag.in_(tags))
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if 'not-tags' in filters:
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tags = _get_tag_list(filters.pop('not-tags'))
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first_tag = tags.pop(0)
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subq = query.session.query(tag_model.Tag.standard_attr_id)
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subq = subq.filter(tag_model.Tag.tag == first_tag)
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for tag in tags:
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tag_alias = aliased(tag_model.Tag)
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subq = subq.join(tag_alias,
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tag_model.Tag.standard_attr_id == tag_alias.standard_attr_id)
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subq = subq.filter(tag_alias.tag == tag)
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query = query.filter(~model.standard_attr_id.in_(subq))
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if 'not-tags-any' in filters:
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tags = _get_tag_list(filters.pop('not-tags-any'))
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subq = query.session.query(tag_model.Tag.standard_attr_id)
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subq = subq.filter(tag_model.Tag.tag.in_(tags))
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query = query.filter(~model.standard_attr_id.in_(subq))
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return query
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