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Viewing changes to grackle/server/model.py

  • Committer: Curtis Hovey
  • Date: 2012-03-16 19:40:16 UTC
  • mto: This revision was merged to the branch mainline in revision 45.
  • Revision ID: curtis.hovey@canonical.com-20120316194016-l6hkopyhbocultxd
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grackle/server/model.py
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# Copyright (c) 2012 Canonical Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public
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# License along with this program. If not, see
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# <http://www.gnu.org/licenses/>.
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import datetime
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import dateutil.tz
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import email.parser
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from email.utils import parsedate_tz
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import logging
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import uuid
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import pycassa
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from pycassa.system_manager import (
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    LEXICAL_UUID_TYPE,
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    SystemManager,
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    TIME_UUID_TYPE,
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    )
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from grackle.server.cassandra import workaround_1779
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def create_schema(host, keyspace, clobber=False):
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    mgr = SystemManager(host)
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    if clobber:
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        for cf in mgr.get_keyspace_column_families(keyspace):
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            mgr.drop_column_family(keyspace, cf)
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    try:
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        workaround_1779(
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            mgr.create_column_family, keyspace, 'message',
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            key_validation_class=LEXICAL_UUID_TYPE)
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        workaround_1779(
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            mgr.create_column_family, keyspace, 'archive_message',
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            comparator_type=TIME_UUID_TYPE,
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            default_validation_class=LEXICAL_UUID_TYPE)
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        pass
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    finally:
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        mgr.close()
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class CassandraConnection(object):
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    def __init__(self, keyspace, host):
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        self._keyspace = keyspace
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        self._host = host
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        self._connection = self._connect()
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        self.messages = self._column_family('message')
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        self.archive_messages = self._column_family('archive_message')
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    def _connect(self):
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        return pycassa.connect(self._keyspace, self._host)
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    def _column_family(self, name):
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        return pycassa.ColumnFamily(self._connection, name)
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    def add_message(self, archive_uuid, message):
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        message_uuid = uuid.uuid4()
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        parsed = email.parser.Parser().parsestr(message)
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        date = parsed.get('date')
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        if date is not None:
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            try:
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                pdate = parsedate_tz(date)
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                date = datetime.datetime(
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                    *pdate[:6],
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                    tzinfo=dateutil.tz.tzoffset('', pdate[9]))
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            except ValueError:
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                pass
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        self.messages.insert(
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            message_uuid,
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            {'date_created': datetime.datetime.utcnow().isoformat() + 'Z',
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             'content': message,
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             'from': parsed.get('From'),
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             'subject': parsed.get('Subject'),
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             'date': date.isoformat() if date is not None else None,
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             'message_id': parsed.get('Message-ID'),
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             })
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        self.archive_messages.insert(
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            archive_uuid,
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            {date.astimezone(dateutil.tz.tzutc()): message_uuid})
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        logging.debug(
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            'Imported %s into %s' % (parsed.get('Message-ID'), archive_uuid))
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        return message_uuid
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    def _format_message(self, message):
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        return {
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            'date': message['date'],
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            'from': message['from'],
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            'subject': message['subject'],
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            }
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    def get_messages(self, archive_uuid, count, order):
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        if order in ("date", "-date"):
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            reversed = order[0] == '-'
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        else:
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            raise AssertionError("Unsupported order.")
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        ids = self.archive_messages.get(
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            archive_uuid, column_count=count,
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            column_reversed=reversed).values()
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        messages = self.messages.multiget(ids)
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        return [self._format_message(messages[id]) for id in ids]