1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
# 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 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()
self.messages.insert(
message_uuid,
{'date_created': datetime.datetime.utcnow().isoformat() + 'Z',
'content': message,
})
self.archive_messages.insert(
archive_uuid, {datetime.datetime.now(): message_uuid})
return message_uuid
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 [messages[id]['content'] for id in ids]
|