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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 functools
import logging
import time
import uuid
import pycassa
from pycassa.system_manager import (
LEXICAL_UUID_TYPE,
SystemManager,
TIME_UUID_TYPE,
)
from pycassa.util import convert_time_to_uuid
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
def _utc_datetime(dt):
return dt.astimezone(dateutil.tz.tzutc())
def _utc_timestamp(dt):
return time.mktime(_utc_datetime(dt).timetuple()) - time.timezone
def _utc_timeuuid(dt, lowest_val=True):
return convert_time_to_uuid(_utc_timestamp(dt), lowest_val)
def _cmp_timeuuid(a, b):
if a.time != b.time:
return cmp(a.time, b.time)
return cmp(a, b)
def _bound_timeuuid(a, b, max=False):
if a == '' or _cmp_timeuuid(b, a) == (1 if max else -1):
return b
return a
def _make_bounds(memo, range_start, range_finish, backward):
start = finish = ''
if memo != '':
memo = uuid.UUID(memo)
if backward:
finish = memo
else:
start = memo
if range_start is not None:
start = _bound_timeuuid(
start, _utc_timeuuid(range_start), max=True)
if range_finish is not None:
finish = _bound_timeuuid(
finish, _utc_timeuuid(range_finish, lowest_val=False))
return memo, start, finish
LEGAL_HEADERS = set([
'date', 'from', 'subject', 'message-id',
])
def _format_message(want, message):
data = {}
for key in want:
data[key] = message.get(key)
return data
def _format_all(headers):
assert not set(headers).difference(LEGAL_HEADERS)
want = list(headers) + ['content']
return want, functools.partial(_format_message, want)
FORMATS = {
'all': _format_all,
}
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,
{_utc_timestamp(message_date): message_uuid})
logging.debug(
'Imported %s into %s'
% (message_dict.get('message-id', None), archive_uuid))
return message_uuid
def _trim(self, sequence, end):
"""Return the sequence with one of the ends trimmed.
:param end: if true, remove the last element. otherwise remove
the first.
"""
if end:
return sequence[:-1]
else:
return sequence[1:]
def get_messages(self, archive_uuid, order, count, memo, backward=False,
start_date=None, finish_date=None, format='all',
headers=['from', 'date', 'subject', 'message-id']):
if order in ("date", "-date"):
reversed = order[0] == '-'
else:
raise AssertionError("Unsupported order.")
memo, start, finish = _make_bounds(
memo, start_date, finish_date, backward)
# Get up to n+1 messages from the memo: the last item of the
# previous batch (because that's where the memo starts) + this
# batch.
pairs = self.archive_messages.get(
archive_uuid, column_count=count + 1, column_start=start,
column_finish=finish, column_reversed=reversed).items()
if len(pairs) and memo and pairs[0][0] <= memo:
# The memo (from the previous batch) was included in the result.
# Trim it.
pairs = self._trim(pairs, False ^ backward)
elif len(pairs) > count:
# There was no memo in the result, so the n+1th element is
# unnecessary. Kill it.
pairs = self._trim(pairs, True ^ backward)
if len(pairs) == 0:
return (None, [], None)
assert 0 < len(pairs) <= count
# We've narrowed down the message references. Fetch the messages.
ids = [v for k, v in pairs]
wanted_cols, func = FORMATS[format](headers)
# XXX: No need to get all columns. Restrict based on format.
messages = self.messages.multiget(ids)
return (
str(pairs[0][0]),
[func(messages[id]) for id in ids],
str(pairs[-1][0]),
)
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