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
|
# Copyright (C) 2007-2014 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman 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.
#
# GNU Mailman 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
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Storm type conversions."""
from __future__ import absolute_import, print_function, unicode_literals
__metaclass__ = type
__all__ = [
'Enum',
'UUID',
]
import uuid
from sqlalchemy import Integer
from sqlalchemy.dialects import postgresql
from sqlalchemy.types import TypeDecorator, BINARY, CHAR
class Enum(TypeDecorator):
"""Handle Python 3.4 style enums.
Stores an integer-based Enum as an integer in the database, and
converts it on-the-fly.
"""
impl = Integer
def __init__(self, enum, *args, **kw):
self.enum = enum
super(Enum, self).__init__(*args, **kw)
def process_bind_param(self, value, dialect):
if value is None:
return None
return value.value
def process_result_value(self, value, dialect):
if value is None:
return None
return self.enum(value)
class UUID(TypeDecorator):
"""Handle UUIds."""
impl = BINARY(16)
python_type = uuid.UUID
def __init__(self, binary=True, native=True):
self.binary = binary
self.native = native
def load_dialect_impl(self, dialect):
if dialect.name == 'postgresql' and self.native:
# Use the native UUID type.
return dialect.type_descriptor(postgresql.UUID())
else:
# Fallback to either a BINARY or a CHAR.
kind = self.impl if self.binary else CHAR(32)
return dialect.type_descriptor(kind)
@staticmethod
def _coerce(value):
if value and not isinstance(value, uuid.UUID):
try:
value = uuid.UUID(value)
except (TypeError, ValueError):
value = uuid.UUID(bytes=value)
return value
def process_bind_param(self, value, dialect):
if value is None:
return value
if not isinstance(value, uuid.UUID):
value = self._coerce(value)
if self.native and dialect.name == 'postgresql':
return str(value)
return value.bytes if self.binary else value.hex
def process_result_value(self, value, dialect):
if value is None:
return value
if self.native and dialect.name == 'postgresql':
return uuid.UUID(value)
return uuid.UUID(bytes=value) if self.binary else uuid.UUID(value)
|
