~unity-2d-team/unity-2d/Shell-MultiMonitor

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# Copyright (c) 2012 Canonical Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with this program. If not, see
# <http://www.gnu.org/licenses/>.

import datetime
import dateutil.tz
import email.parser
from email.utils import parsedate_tz
import logging
import uuid

import pycassa
from pycassa.system_manager import (
    LEXICAL_UUID_TYPE,
    SystemManager,
    TIME_UUID_TYPE,
    )

from grackle.cassandra import workaround_1779


def create_schema(host, keyspace, clobber=False, create_keyspace=False):
    mgr = SystemManager(host)

    if create_keyspace:
        mgr.create_keyspace(keyspace, replication_factor=1)

    if clobber:
        for cf in mgr.get_keyspace_column_families(keyspace):
            mgr.drop_column_family(keyspace, cf)

    try:
        workaround_1779(
            mgr.create_column_family, keyspace, 'message',
            key_validation_class=LEXICAL_UUID_TYPE)
        workaround_1779(
            mgr.create_column_family, keyspace, 'archive_message',
            comparator_type=TIME_UUID_TYPE,
            default_validation_class=LEXICAL_UUID_TYPE)
        pass
    finally:
        mgr.close()


def _parse_message(message):
    """Get a date and dict of an RFC822 message."""
    parsed = email.parser.Parser().parsestr(message)
    message_dict = {}

    for key in ('from', 'to', 'subject', 'message-id'):
        value = parsed.get(key, None)
        if value is not None:
            message_dict[key] = value

    date = parsed.get('date')
    if date is not None:
        try:
            pdate = parsedate_tz(date)
            date = datetime.datetime(
                *pdate[:6],
                tzinfo=dateutil.tz.tzoffset('', pdate[9]))
        except ValueError:
            pass
    message_dict['date'] = date.isoformat() if date is not None else None

    return date, message_dict


class CassandraConnection(object):

    def __init__(self, keyspace, host):
        self._keyspace = keyspace
        self._host = host
        self._connection = self._connect()
        self.messages = self._column_family('message')
        self.archive_messages = self._column_family('archive_message')

    def _connect(self):
        return pycassa.connect(self._keyspace, self._host)

    def _column_family(self, name):
        return pycassa.ColumnFamily(self._connection, name)

    def add_message(self, archive_uuid, message):
        message_uuid = uuid.uuid4()
        message_date, message_dict = _parse_message(message)
        message_dict['content'] = message
        message_dict['date_created'] = (
            datetime.datetime.utcnow().isoformat() + 'Z')
        self.messages.insert(message_uuid, message_dict)
        self.archive_messages.insert(
            archive_uuid,
            {message_date.astimezone(dateutil.tz.tzutc()): message_uuid})
        logging.debug(
            'Imported %s into %s'
            % (message_dict.get('message-id', None), archive_uuid))
        return message_uuid

    def _format_message(self, message):
        return {
            'date': message.get('date'),
            'from': message.get('from'),
            'subject': message.get('subject'),
            'message-id': message.get('message-id'),
            }

    def get_messages(self, archive_uuid, order, count, start):
        if order in ("date", "-date"):
            reversed = order[0] == '-'
        else:
            raise AssertionError("Unsupported order.")
        pairs = self.archive_messages.get(
            archive_uuid, column_count=count + 1,
            column_start=start, column_reversed=reversed).items()
        ids = [v for k, v in pairs]
        messages = self.messages.multiget(
            ids, columns=['date', 'from', 'subject', 'message-id'])
        actual_count = len(pairs)
        if len(pairs) > count:
            assert len(pairs) == count + 1
            actual_count -= 1
            next_memo = str(pairs[count][0])
        else:
            next_memo = None
        return (
            [self._format_message(messages[id]) for id in ids[:actual_count]],
            next_memo,
            )