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Viewing changes to grackle/server/model.py

  • Committer: William Grant
  • Date: 2012-01-20 08:26:17 UTC
  • Revision ID: william.grant@canonical.com-20120120082617-4t3zdb532je063j4
A little bit of server.

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grackle/server/model.py
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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 grackle.server.cassandra import workaround_1779
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def create_schema(host, keyspace, clobber=False, create_keyspace=False):
 
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def create_schema(host, keyspace, clobber=False):
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    mgr = SystemManager(host)
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    if create_keyspace:
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        mgr.create_keyspace(keyspace, replication_factor=1)
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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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        mgr.close()
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def _parse_message(message):
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    """Get a date and dict of an RFC822 message."""
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    parsed = email.parser.Parser().parsestr(message)
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    message_dict = {}
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    for key in ('from', 'to', 'subject', 'message-id'):
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        value = parsed.get(key, None)
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        if value is not None:
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            message_dict[key] = value
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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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    message_dict['date'] = date.isoformat() if date is not None else None
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    return date, message_dict
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class CassandraConnection(object):
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    def __init__(self, keyspace, host):
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    def add_message(self, archive_uuid, message):
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        message_uuid = uuid.uuid4()
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        message_date, message_dict = _parse_message(message)
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        message_dict['content'] = message
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        message_dict['date_created'] = (
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            datetime.datetime.utcnow().isoformat() + 'Z')
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        self.messages.insert(message_uuid, message_dict)
 
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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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             })
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        self.archive_messages.insert(
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            archive_uuid,
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            {message_date.astimezone(dateutil.tz.tzutc()): message_uuid})
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        logging.debug(
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            'Imported %s into %s'
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            % (message_dict.get('message-id', None), archive_uuid))
 
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            archive_uuid, {datetime.datetime.now(): message_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.get('date'),
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            'from': message.get('from'),
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            'subject': message.get('subject'),
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            }
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    def get_messages(self, archive_uuid, order, count, start):
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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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        pairs = self.archive_messages.get(
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            archive_uuid, column_count=count + 1,
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            column_start=start, column_reversed=reversed).items()
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        ids = [v for k, v in pairs]
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        messages = self.messages.multiget(
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            ids, columns=['date', 'from', 'subject'])
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        actual_count = len(pairs)
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        if len(pairs) > count:
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            assert len(pairs) == count + 1
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            actual_count -= 1
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            next_memo = str(pairs[count][0])
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        else:
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            next_memo = None
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        return (
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            [self._format_message(messages[id]) for id in ids[:actual_count]],
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            next_memo,
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            )
 
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    def get_messages(self, archive_uuid):
 
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        ids = self.archive_messages.get(
 
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            archive_uuid, column_count=10, column_reversed=True).values()
 
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        messages = self.messages.multiget(ids)
 
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        return [messages[id]['content'] for id in ids]