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

# 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.server.cassandra import workaround_1779

def create_schema(host, keyspace, clobber=False):

    mgr = SystemManager(host)

    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()

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()

        parsed = email.parser.Parser().parsestr(message)

        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

        self.messages.insert(

            message_uuid,

            {'date_created': datetime.datetime.utcnow().isoformat() + 'Z',

             'content': message,

             'from': parsed.get('From'),

             'subject': parsed.get('Subject'),

             'date': date.isoformat() if date is not None else None,

             'message_id': parsed.get('Message-ID'),

             })

        self.archive_messages.insert(

            archive_uuid,

            {date.astimezone(dateutil.tz.tzutc()): message_uuid})

        logging.debug(

            'Imported %s into %s' % (parsed.get('Message-ID'), archive_uuid))

        return message_uuid

    def _format_message(self, message):

        return {

            'date': message['date'],

            'from': message['from'],

            'subject': message['subject'],

            }

    def get_messages(self, archive_uuid):

        ids = self.archive_messages.get(

            archive_uuid, column_count=10, column_reversed=True).values()

        messages = self.messages.multiget(ids)

        return [self._format_message(messages[id]) for id in ids]