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# -*- coding: utf-8 -*-
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# Copyright 2010 - 2017 RhodeCode GmbH and the AppEnlight project authors
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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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import sqlalchemy as sa
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from appenlight.lib.ext_json import json
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from pyramid.threadlocal import get_current_registry
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from appenlight.models.tag import Tag
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from appenlight.models.services.base import BaseService
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from appenlight.models import get_db_session
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class TagService(BaseService):
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@classmethod
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def cut_name(cls, tag_name):
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return tag_name[:32]
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@classmethod
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def cut_value(cls, value):
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if isinstance(value, str):
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value = value[:128]
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return value
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@classmethod
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def by_resource_id_and_value(cls, resource_id, tag_name, value,
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db_session=None, create_missing=True):
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"""
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Fetches tag and creates a new one if missing
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"""
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db_session = get_db_session(db_session)
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registry = get_current_registry()
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@registry.cache_regions.redis_min_10.cache_on_arguments(
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namespace='TagService.by_resource_id_and_value')
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def cached(resource_id, tag_name, value):
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reduced_name = cls.cut_name(tag_name.decode('utf8'))
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reduced_value = cls.cut_value(value.decode('utf8'))
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query = db_session.query(Tag)
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query = query.filter(Tag.resource_id == resource_id)
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query = query.filter(Tag.name == reduced_name)
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query = query.filter(sa.cast(Tag.value, sa.types.TEXT) ==
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sa.cast(json.dumps(reduced_value),
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sa.types.TEXT))
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tag = query.first()
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if tag:
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db_session.expunge(tag)
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return tag
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view = cached(resource_id, tag_name.encode('utf8'),
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value.encode('utf8'))
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if not view and create_missing:
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view = cls.create_tag(resource_id,
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cls.cut_name(tag_name),
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cls.cut_value(value),
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db_session)
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cached.invalidate(resource_id, tag_name.encode('utf8'),
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value.encode('utf8'))
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return view
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@classmethod
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def create_tag(cls, resource_id, tag_name, value, db_session=None):
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tag = Tag(resource_id=resource_id,
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name=cls.cut_name(tag_name),
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value=cls.cut_value(value))
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db_session = get_db_session(db_session)
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db_session.add(tag)
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db_session.flush()
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return tag
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@classmethod
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def by_tag_id(cls, tag_id, db_session=None):
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db_session = get_db_session(db_session)
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registry = get_current_registry()
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@registry.cache_regions.redis_min_10.cache_on_arguments(
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namespace='TagService.by_tag_id')
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def cached(tag_id):
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tag = db_session.query(Tag).filter(Tag.id == tag_id).first()
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if tag:
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db_session.expunge(tag)
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return tag
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return cached(tag_id)
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