psycopg2/tests/test_cancel.py

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