137 lines
5.1 KiB
Python
137 lines
5.1 KiB
Python
##############################################################################
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#
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# Copyright (c) 2009 Zope Foundation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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import unittest
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class ReplicaSelectorTests(unittest.TestCase):
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def setUp(self):
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import os
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import tempfile
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fd, self.fn = tempfile.mkstemp()
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os.write(fd,
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b"# Replicas\n\nexample.com:1234\nlocalhost:4321\n"
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b"\nlocalhost:9999\n")
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os.close(fd)
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def tearDown(self):
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import os
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os.remove(self.fn)
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def test__read_config_normal(self):
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from relstorage.adapters.replica import ReplicaSelector
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rs = ReplicaSelector(self.fn, 600.0)
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self.assertEqual(rs._replicas,
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['example.com:1234', 'localhost:4321', 'localhost:9999'])
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def test__read_config_empty(self):
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from relstorage.adapters.replica import ReplicaSelector
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open(self.fn, 'w').close() # truncate the replica list file
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self.assertRaises(IndexError, ReplicaSelector, self.fn, 600.0)
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def test__is_config_modified(self):
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from relstorage.adapters.replica import ReplicaSelector
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import time
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rs = ReplicaSelector(self.fn, 600.0)
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self.assertEqual(rs._is_config_modified(), False)
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# change the file
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rs._config_modified = 0
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# don't check the file yet
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rs._config_checked = time.time() + 3600
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self.assertEqual(rs._is_config_modified(), False)
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# now check the file
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rs._config_checked = 0
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self.assertEqual(rs._is_config_modified(), True)
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def test__select(self):
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from relstorage.adapters.replica import ReplicaSelector
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rs = ReplicaSelector(self.fn, 600.0)
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rs._select(0)
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self.assertEqual(rs._current_replica, 'example.com:1234')
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self.assertEqual(rs._current_index, 0)
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self.assertEqual(rs._expiration, None)
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rs._select(1)
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self.assertEqual(rs._current_replica, 'localhost:4321')
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self.assertEqual(rs._current_index, 1)
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self.assertNotEqual(rs._expiration, None)
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def test_current(self):
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from relstorage.adapters.replica import ReplicaSelector
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rs = ReplicaSelector(self.fn, 600.0)
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self.assertEqual(rs.current(), 'example.com:1234')
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# change the file and get the new current replica
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f = open(self.fn, 'w')
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f.write('localhost\nalternate\n')
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f.close()
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rs._config_checked = 0
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rs._config_modified = 0
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self.assertEqual(rs.current(), 'localhost')
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# switch to the alternate
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rs._select(1)
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self.assertEqual(rs.current(), 'alternate')
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# expire the alternate
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rs._expiration = 0
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self.assertEqual(rs.current(), 'localhost')
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def test_next_iteration(self):
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from relstorage.adapters.replica import ReplicaSelector
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rs = ReplicaSelector(self.fn, 600.0)
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# test forward iteration
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self.assertEqual(rs.current(), 'example.com:1234')
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self.assertEqual(rs.next(), 'localhost:4321')
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self.assertEqual(rs.next(), 'localhost:9999')
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self.assertEqual(rs.next(), None)
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# test iteration that skips over the replica that failed
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self.assertEqual(rs.current(), 'example.com:1234')
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self.assertEqual(rs.next(), 'localhost:4321')
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self.assertEqual(rs.current(), 'localhost:4321')
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# next() after current() indicates the last replica failed
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self.assertEqual(rs.next(), 'example.com:1234')
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self.assertEqual(rs.next(), 'localhost:9999')
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self.assertEqual(rs.next(), None)
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def test_next_only_one_server(self):
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from relstorage.adapters.replica import ReplicaSelector
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f = open(self.fn, 'w')
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f.write('localhost\n')
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f.close()
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rs = ReplicaSelector(self.fn, 600.0)
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self.assertEqual(rs.current(), 'localhost')
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self.assertEqual(rs.next(), None)
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def test_next_with_new_conf(self):
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from relstorage.adapters.replica import ReplicaSelector
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rs = ReplicaSelector(self.fn, 600.0)
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self.assertEqual(rs.current(), 'example.com:1234')
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self.assertEqual(rs.next(), 'localhost:4321')
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# interrupt the iteration by changing the replica conf file
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f = open(self.fn, 'w')
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f.write('example.com:9999\n')
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f.close()
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rs._config_checked = 0
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rs._config_modified = 0
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self.assertEqual(rs.next(), 'example.com:9999')
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self.assertEqual(rs.next(), None)
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def test_suite():
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suite = unittest.TestSuite()
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suite.addTest(unittest.makeSuite(ReplicaSelectorTests))
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return suite
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if __name__ == '__main__':
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unittest.main(defaultTest='test_suite')
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