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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
# Copyright (C) 2016-present the asyncpg authors and contributors
# <see AUTHORS file>
#
# This module is part of asyncpg and is released under
# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
import asyncpg
from asyncpg import _testbase as tb
class TestTransaction(tb.ConnectedTestCase):
async def test_transaction_regular(self):
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction()
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
with self.assertRaises(ZeroDivisionError):
async with tr as with_tr:
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
# We don't return the transaction object from __aenter__,
# to make it harder for people to use '.rollback()' and
# '.commit()' from within an 'async with' block.
self.assertIsNone(with_tr)
await self.con.execute('''
CREATE TABLE mytab (a int);
''')
1 / 0
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
with self.assertRaisesRegex(asyncpg.PostgresError,
'"mytab" does not exist'):
await self.con.prepare('''
SELECT * FROM mytab
''')
async def test_transaction_nested(self):
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction()
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
with self.assertRaises(ZeroDivisionError):
async with tr:
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
await self.con.execute('''
CREATE TABLE mytab (a int);
''')
async with self.con.transaction():
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
await self.con.execute('''
INSERT INTO mytab (a) VALUES (1), (2);
''')
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
with self.assertRaises(ZeroDivisionError):
in_tr = self.con.transaction()
async with in_tr:
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
await self.con.execute('''
INSERT INTO mytab (a) VALUES (3), (4);
''')
1 / 0
st = await self.con.prepare('SELECT * FROM mytab;')
recs = []
async for rec in st.cursor():
recs.append(rec)
self.assertEqual(len(recs), 2)
self.assertEqual(recs[0][0], 1)
self.assertEqual(recs[1][0], 2)
self.assertIs(self.con._top_xact, tr)
self.assertTrue(self.con.is_in_transaction())
1 / 0
self.assertIs(self.con._top_xact, None)
self.assertFalse(self.con.is_in_transaction())
with self.assertRaisesRegex(asyncpg.PostgresError,
'"mytab" does not exist'):
await self.con.prepare('''
SELECT * FROM mytab
''')
async def test_transaction_interface_errors(self):
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction(readonly=True, isolation='serializable')
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot start; .* already started'):
async with tr:
await tr.start()
self.assertTrue(repr(tr).startswith(
'<asyncpg.Transaction state:rolledback serializable readonly'))
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot start; .* already rolled back'):
async with tr:
pass
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction()
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot manually commit.*async with'):
async with tr:
await tr.commit()
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction()
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot manually rollback.*async with'):
async with tr:
await tr.rollback()
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
tr = self.con.transaction()
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot enter context:.*async with'):
async with tr:
async with tr:
pass
async def test_transaction_within_manual_transaction(self):
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
await self.con.execute('BEGIN')
tr = self.con.transaction()
self.assertIsNone(self.con._top_xact)
self.assertTrue(self.con.is_in_transaction())
with self.assertRaisesRegex(asyncpg.InterfaceError,
'cannot use Connection.transaction'):
await tr.start()
with self.assertLoopErrorHandlerCalled(
'Resetting connection with an active transaction'):
await self.con.reset()
self.assertIsNone(self.con._top_xact)
self.assertFalse(self.con.is_in_transaction())
async def test_isolation_level(self):
await self.con.reset()
default_isolation = await self.con.fetchval(
'SHOW default_transaction_isolation'
)
isolation_levels = {
None: default_isolation,
'read_committed': 'read committed',
'read_uncommitted': 'read uncommitted',
'repeatable_read': 'repeatable read',
'serializable': 'serializable',
}
set_sql = 'SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL '
get_sql = 'SHOW TRANSACTION ISOLATION LEVEL'
for tx_level in isolation_levels:
for conn_level in isolation_levels:
with self.subTest(conn=conn_level, tx=tx_level):
if conn_level:
await self.con.execute(
set_sql + isolation_levels[conn_level]
)
level = await self.con.fetchval(get_sql)
self.assertEqual(level, isolation_levels[conn_level])
async with self.con.transaction(isolation=tx_level):
level = await self.con.fetchval(get_sql)
self.assertEqual(
level,
isolation_levels[tx_level or conn_level],
)
await self.con.reset()
async def test_nested_isolation_level(self):
set_sql = 'SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL '
isolation_levels = {
'read_committed': 'read committed',
'read_uncommitted': 'read uncommitted',
'repeatable_read': 'repeatable read',
'serializable': 'serializable',
}
for inner in [None] + list(isolation_levels):
for outer, outer_sql_level in isolation_levels.items():
for implicit in [False, True]:
with self.subTest(
implicit=implicit, outer=outer, inner=inner,
):
if implicit:
await self.con.execute(set_sql + outer_sql_level)
outer_level = None
else:
outer_level = outer
async with self.con.transaction(isolation=outer_level):
if inner and outer != inner:
with self.assertRaisesRegex(
asyncpg.InterfaceError,
'current {!r} != outer {!r}'.format(
inner, outer
)
):
async with self.con.transaction(
isolation=inner,
):
pass
else:
async with self.con.transaction(
isolation=inner,
):
pass
|
