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partitions.py
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partitions.py
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# Copyright (c) 2013 Rackspace Hosting, Inc.
#
# 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.
import six
from marconi.proxy.storage import base
from marconi.proxy.storage import exceptions
class PartitionsController(base.PartitionsBase):
def __init__(self, *args, **kwargs):
super(PartitionsController, self).__init__(*args, **kwargs)
self._col = self.driver.db['partitions']
def list(self):
for entry in sorted(self._col.values(), key=lambda x: x['n']):
yield _normalize(entry)
def get(self, name):
entry = None
try:
entry = self._col[name]
except KeyError:
raise exceptions.PartitionNotFound(name)
return _normalize(entry)
def exists(self, name):
return name in self._col
def create(self, name, weight, hosts):
self._col[name] = {'n': name,
'w': weight,
'h': hosts}
def update(self, name, **kwargs):
key, value = kwargs.popitem()
assert key in ('weight', 'hosts'), "kwargs (hosts, weight)"
try:
self._col[name][key[0]] = value
except KeyError:
raise exceptions.PartitionNotFound(name)
def delete(self, name):
try:
del self._col[name]
except KeyError:
pass
def drop_all(self):
self._col = {}
def _normalize(entry):
return {
'name': six.text_type(entry['n']),
'hosts': entry['h'],
'weight': entry['w']
}