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72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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'''
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Cassandra-based object store
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The shove psuedo-URL for a cassandra-based store is:
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cassandra://<host>:<port>/<keyspace>/<columnFamily>
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'''
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import urlparse
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try:
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import pycassa
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except ImportError:
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raise ImportError('This store requires the pycassa library')
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from shove import BaseStore
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class CassandraStore(BaseStore):
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'''Cassandra based store'''
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init = 'cassandra://'
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def __init__(self, engine, **kw):
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super(CassandraStore, self).__init__(engine, **kw)
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spliturl = urlparse.urlsplit(engine)
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_, keyspace, column_family = spliturl[2].split('/')
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try:
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self._pool = pycassa.connect(keyspace, [spliturl[1]])
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self._store = pycassa.ColumnFamily(self._pool, column_family)
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except pycassa.InvalidRequestException:
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from pycassa.system_manager import SystemManager
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system_manager = SystemManager(spliturl[1])
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system_manager.create_keyspace(
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keyspace,
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pycassa.system_manager.SIMPLE_STRATEGY,
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{'replication_factor': str(kw.get('replication', 1))}
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)
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system_manager.create_column_family(keyspace, column_family)
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self._pool = pycassa.connect(keyspace, [spliturl[1]])
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self._store = pycassa.ColumnFamily(self._pool, column_family)
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def __getitem__(self, key):
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try:
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item = self._store.get(key).get(key)
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if item is not None:
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return self.loads(item)
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raise KeyError(key)
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except pycassa.NotFoundException:
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raise KeyError(key)
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def __setitem__(self, key, value):
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self._store.insert(key, dict(key=self.dumps(value)))
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def __delitem__(self, key):
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# beware eventual consistency
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try:
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self._store.remove(key)
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except pycassa.NotFoundException:
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raise KeyError(key)
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def clear(self):
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# beware eventual consistency
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self._store.truncate()
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def keys(self):
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return list(i[0] for i in self._store.get_range())
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__all__ = ['CassandraStore']
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