OpenStack Study: kvs.py

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# Copyright 2012 OpenStack Foundation

#

# Licensed under the Apache License, Version 2.0 (the "License"); you may

# not use this file except in compliance with the License. You may obtain

# a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

# License for the specific language governing permissions and limitations

# under the License.

from keystone.common import kvs

from keystone.contrib import stats

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class Stats(kvs.Base, stats.Driver):

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    def get_stats(self, api):

        return self.db.get('stats-%s' % api, {})

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    def set_stats(self, api, stats_ref):

        self.db.set('stats-%s' % api, stats_ref)

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    def increment_stat(self, api, category, value):

        """Increment a statistic counter, or create it if it doesn't exist."""

        stats = self.get_stats(api)

        stats.setdefault(category, dict())

        counter = stats[category].setdefault(value, 0)

        stats[category][value] = counter + 1

        self.set_stats(api, stats)