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cf243ccf37
If the cancel signal misses the race, this query will stay in the backend until the sleep expires.
92 lines
2.7 KiB
Python
92 lines
2.7 KiB
Python
#!/usr/bin/env python
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import time
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import threading
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from testutils import unittest, skip_if_no_pg_sleep
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import tests
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import psycopg2
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import psycopg2.extensions
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from psycopg2 import extras
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class CancelTests(unittest.TestCase):
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def setUp(self):
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self.conn = psycopg2.connect(tests.dsn)
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cur = self.conn.cursor()
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cur.execute('''
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CREATE TEMPORARY TABLE table1 (
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id int PRIMARY KEY
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)''')
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self.conn.commit()
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def tearDown(self):
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self.conn.close()
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def test_empty_cancel(self):
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self.conn.cancel()
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@skip_if_no_pg_sleep('conn')
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def test_cancel(self):
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errors = []
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def neverending(conn):
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cur = conn.cursor()
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try:
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self.assertRaises(psycopg2.extensions.QueryCanceledError,
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cur.execute, "select pg_sleep(60)")
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# make sure the connection still works
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conn.rollback()
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cur.execute("select 1")
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self.assertEqual(cur.fetchall(), [(1, )])
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except Exception, e:
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errors.append(e)
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raise
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def canceller(conn):
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cur = conn.cursor()
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try:
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conn.cancel()
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except Exception, e:
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errors.append(e)
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raise
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thread1 = threading.Thread(target=neverending, args=(self.conn, ))
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# wait a bit to make sure that the other thread is already in
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# pg_sleep -- ugly and racy, but the chances are ridiculously low
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thread2 = threading.Timer(0.3, canceller, args=(self.conn, ))
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thread1.start()
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thread2.start()
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thread1.join()
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thread2.join()
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self.assertEqual(errors, [])
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@skip_if_no_pg_sleep('conn')
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def test_async_cancel(self):
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async_conn = psycopg2.connect(tests.dsn, async=True)
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self.assertRaises(psycopg2.OperationalError, async_conn.cancel)
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extras.wait_select(async_conn)
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cur = async_conn.cursor()
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cur.execute("select pg_sleep(10000)")
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self.assertTrue(async_conn.isexecuting())
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async_conn.cancel()
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self.assertRaises(psycopg2.extensions.QueryCanceledError,
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extras.wait_select, async_conn)
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cur.execute("select 1")
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extras.wait_select(async_conn)
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self.assertEqual(cur.fetchall(), [(1, )])
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def test_async_connection_cancel(self):
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async_conn = psycopg2.connect(tests.dsn, async=True)
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async_conn.close()
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self.assertTrue(async_conn.closed)
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def test_suite():
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return unittest.TestLoader().loadTestsFromName(__name__)
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if __name__ == "__main__":
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unittest.main()
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