← Back to branch summary

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

« back to all changes in this revision

Viewing changes to grackle/server/model.py

  • Committer: William Grant
  • Date: 2012-01-20 08:26:17 UTC
  • Revision ID: william.grant@canonical.com-20120120082617-4t3zdb532je063j4
A little bit of server.

Show diffs side-by-side

added added

removed removed

Lines of Context:
grackle/server/model.py
 
1
# Copyright (c) 2012 Canonical Ltd
 
2
#
 
3
# This program is free software: you can redistribute it and/or modify
 
4
# it under the terms of the GNU Affero General Public License as published by
 
5
# the Free Software Foundation, either version 3 of the License, or
 
6
# (at your option) any later version.
 
7
#
 
8
# This program is distributed in the hope that it will be useful,
 
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
11
# GNU Affero General Public License for more details.
 
12
#
 
13
# You should have received a copy of the GNU Affero General Public
 
14
# License along with this program. If not, see
 
15
# <http://www.gnu.org/licenses/>.
 
16
 
 
17
import datetime
 
18
import uuid
 
19
 
 
20
import pycassa
 
21
from pycassa.system_manager import (
 
22
    LEXICAL_UUID_TYPE,
 
23
    SystemManager,
 
24
    TIME_UUID_TYPE,
 
25
    )
 
26
 
 
27
from grackle.server.cassandra import workaround_1779
 
28
 
 
29
 
 
30
def create_schema(host, keyspace, clobber=False):
 
31
    mgr = SystemManager(host)
 
32
 
 
33
    if clobber:
 
34
        for cf in mgr.get_keyspace_column_families(keyspace):
 
35
            mgr.drop_column_family(keyspace, cf)
 
36
 
 
37
    try:
 
38
        workaround_1779(
 
39
            mgr.create_column_family, keyspace, 'message',
 
40
            key_validation_class=LEXICAL_UUID_TYPE)
 
41
        workaround_1779(
 
42
            mgr.create_column_family, keyspace, 'archive_message',
 
43
            comparator_type=TIME_UUID_TYPE,
 
44
            default_validation_class=LEXICAL_UUID_TYPE)
 
45
        pass
 
46
    finally:
 
47
        mgr.close()
 
48
 
 
49
 
 
50
class CassandraConnection(object):
 
51
 
 
52
    def __init__(self, keyspace, host):
 
53
        self._keyspace = keyspace
 
54
        self._host = host
 
55
        self._connection = self._connect()
 
56
        self.messages = self._column_family('message')
 
57
        self.archive_messages = self._column_family('archive_message')
 
58
 
 
59
    def _connect(self):
 
60
        return pycassa.connect(self._keyspace, self._host)
 
61
 
 
62
    def _column_family(self, name):
 
63
        return pycassa.ColumnFamily(self._connection, name)
 
64
 
 
65
    def add_message(self, archive_uuid, message):
 
66
        message_uuid = uuid.uuid4()
 
67
        self.messages.insert(
 
68
            message_uuid,
 
69
            {'date_created': datetime.datetime.utcnow().isoformat() + 'Z',
 
70
             'content': message,
 
71
             })
 
72
        self.archive_messages.insert(
 
73
            archive_uuid, {datetime.datetime.now(): message_uuid})
 
74
        return message_uuid
 
75
 
 
76
    def get_messages(self, archive_uuid):
 
77
        ids = self.archive_messages.get(
 
78
            archive_uuid, column_count=10, column_reversed=True).values()
 
79
        messages = self.messages.multiget(ids)
 
80
        return [messages[id]['content'] for id in ids]