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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# test_cancel.py - unit test for query cancellation
#
# Copyright (C) 2010-2011 Jan Urbański <wulczer@wulczer.org>
#
# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# In addition, as a special exception, the copyright holders give
# permission to link this program with the OpenSSL library (or with
# modified versions of OpenSSL that use the same license as OpenSSL),
# and distribute linked combinations including the two.
#
# You must obey the GNU Lesser General Public License in all respects for
# all of the code used other than OpenSSL.
#
# psycopg2 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 Lesser General Public
# License for more details.
import time
import threading
import psycopg2
import psycopg2.extensions
from psycopg2 import extras
from .testconfig import dsn
import unittest
from .testutils import ConnectingTestCase, skip_before_postgres, slow
class CancelTests(ConnectingTestCase):
def setUp(self):
ConnectingTestCase.setUp(self)
cur = self.conn.cursor()
cur.execute('''
CREATE TEMPORARY TABLE table1 (
id int PRIMARY KEY
)''')
self.conn.commit()
def test_empty_cancel(self):
self.conn.cancel()
@slow
@skip_before_postgres(8, 2)
def test_cancel(self):
errors = []
def neverending(conn):
cur = conn.cursor()
try:
self.assertRaises(psycopg2.extensions.QueryCanceledError,
cur.execute, "select pg_sleep(60)")
# make sure the connection still works
conn.rollback()
cur.execute("select 1")
self.assertEqual(cur.fetchall(), [(1, )])
except Exception as e:
errors.append(e)
raise
def canceller(conn):
cur = conn.cursor()
try:
conn.cancel()
except Exception as e:
errors.append(e)
raise
del cur
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, [])
@slow
@skip_before_postgres(8, 2)
def test_async_cancel(self):
async_conn = psycopg2.connect(dsn, async_=True)
self.assertRaises(psycopg2.OperationalError, async_conn.cancel)
extras.wait_select(async_conn)
cur = async_conn.cursor()
cur.execute("select pg_sleep(10)")
time.sleep(1)
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(dsn, async_=True)
async_conn.close()
self.assertTrue(async_conn.closed)
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
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