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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,
)
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