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Copy pathtest_cache_invalidation.py
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85 lines (63 loc) · 3.11 KB
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# 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 TestCacheInvalidation(tb.ConnectedTestCase):
async def test_prepare_cache_invalidation_silent(self):
await self.con.execute('CREATE TABLE tab1(a int, b int)')
try:
await self.con.execute('INSERT INTO tab1 VALUES (1, 2)')
result = await self.con.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, 2))
await self.con.execute(
'ALTER TABLE tab1 ALTER COLUMN b SET DATA TYPE text')
result = await self.con.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, '2'))
finally:
await self.con.execute('DROP TABLE tab1')
async def test_prepare_cache_invalidation_in_transaction(self):
await self.con.execute('CREATE TABLE tab1(a int, b int)')
try:
await self.con.execute('INSERT INTO tab1 VALUES (1, 2)')
result = await self.con.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, 2))
await self.con.execute(
'ALTER TABLE tab1 ALTER COLUMN b SET DATA TYPE text')
with self.assertRaisesRegex(asyncpg.InvalidCachedStatementError,
'cached statement plan is invalid'):
async with self.con.transaction():
result = await self.con.fetchrow('SELECT * FROM tab1')
# This is now OK,
result = await self.con.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, '2'))
finally:
await self.con.execute('DROP TABLE tab1')
async def test_prepare_cache_invalidation_in_pool(self):
pool = await self.create_pool(database='postgres',
min_size=2, max_size=2)
await self.con.execute('CREATE TABLE tab1(a int, b int)')
try:
await self.con.execute('INSERT INTO tab1 VALUES (1, 2)')
con1 = await pool.acquire()
con2 = await pool.acquire()
result = await con1.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, 2))
result = await con2.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, 2))
await self.con.execute(
'ALTER TABLE tab1 ALTER COLUMN b SET DATA TYPE text')
# con1 tries the same plan, will invalidate the cache
# for the entire pool.
result = await con1.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, '2'))
async with con2.transaction():
# This should work, as con1 should have invalidated
# the plan cache.
result = await con2.fetchrow('SELECT * FROM tab1')
self.assertEqual(result, (1, '2'))
finally:
await self.con.execute('DROP TABLE tab1')
await pool.close()