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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
# -*- coding: utf-8 -*-
# interfaces.py
# Copyright (C) 2017 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from zope.interface import Interface
class IBlobsBackend(Interface):
"""
An interface for a backend that can store blobs.
"""
def read_blob(user, blob_id, consumer, namespace=''):
"""
Read a blob from the backend storage.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param consumer: The object to write data to.
:type consumer: twisted.internet.interfaces.IConsumer provider
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires when the blob has been written to the
consumer.
:rtype: twisted.internet.defer.Deferred
"""
def write_blob(user, blob_id, producer, namespace=''):
"""
Write a blob to the backend storage.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param producer: The object to read data from.
:type producer: twisted.internet.interfaces.IProducer provider
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires when the blob has been written to the
backend storage.
:rtype: twisted.internet.defer.Deferred
:raise BlobExists: Raised when a blob with that id already exists.
:raise QuotaExceeded: Raised when the quota for that user would be
exceeded by this write operation.
"""
def delete_blob(user, blob_id, namespace=''):
"""
Delete a blob from the backend storage.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires when the blob has been deleted.
:rtype: twisted.internet.defer.Deferred
"""
def get_blob_size(user, blob_id, namespace=''):
"""
Get the size of a blob.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires with the size of the blob.
:rtype: twisted.internet.defer.Deferred
"""
def count(user, namespace=''):
"""
Count the total number of blobs.
:param user: The id of the user who owns the blob.
:type user: str
:param namespace: Restrict the count to a certain namespace.
:type namespace: str
:return: A deferred that fires with the number of blobs in the backend
storage, possibly restricted to a certain namespace.
:rtype: twisted.internet.defer.Deferred
"""
def list_blobs(user, namespace='', order_by=None, deleted=False,
filter_flag=None):
"""
List the blobs stored in the backend.
The resulting list can be ordered by date, filtered by namespace or
flag, and include deleted items or not.
:param user: The id of the user who owns the blob.
:type user: str
:param namespace: Restrict the count to a certain namespace.
:type namespace: str
:param order_by: 'date' (equivalent to '+date') or '-date', to sort
ascending or descending by date, respectivelly.
:type order_by: str
:param deleted: Whether to include deleted items in the result.
:type deleted: bool
:param filter_flag: If given, only results flagged with that flag will
be returned.
:type filter_flag: str
:return: A list of blob ids, optionally ordered and/or restricted by
namespace.
:rtype: list of str
:return: A deferred that fires with a list of blob ids, optionally
ordered and/or restricted by namespace.
:rtype: twisted.internet.defer.Deferred
"""
def get_total_storage(user):
"""
Get the size used by a given user as the sum of all the blobs stored
under all that user's namespaces.
:param user: The id of a user.
:type user: str
:return: The size in units of 1024 bytes.
:rtype: int
:return: A deferred that fires with the amount of storage used in units
of 1024 bytes.
:rtype: twisted.internet.defer.Deferred
"""
def get_tag(user, blob_id, namespace=''):
"""
Get the tag of a blob.
:param blob_id: The id of the blob.
:type blob_id: str
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires with the tag of the blob.
:rtype: twisted.internet.defer.Deferred
"""
def get_flags(user, blob_id, namespace=''):
"""
Get the flags for a blob.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires with the list of flags for a blob.
:rtype: twisted.internet.defer.Deferred
"""
def set_flags(user, blob_id, flags, namespace=''):
"""
Set flags for a blob.
:param user: The id of the user who owns the blob.
:type user: str
:param blob_id: The id of the blob.
:type blob_id: str
:param flags: The list of flags to be set.
:type flags: list of str
:param namespace: An optional namespace for the blob.
:type namespace: str
:return: A deferred that fires when the flags have been set.
:rtype: twisted.internet.defer.Deferred
"""
|
