125 lines
3.3 KiB
Python
125 lines
3.3 KiB
Python
# Copyright 2013-2014 MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Test MongoClient's mongos high-availability features using a mock."""
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import sys
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import threading
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import unittest
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sys.path[0:0] = [""]
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from pymongo.errors import AutoReconnect
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from test.pymongo_mocks import MockClient
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class FindOne(threading.Thread):
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def __init__(self, client):
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super(FindOne, self).__init__()
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self.client = client
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self.passed = False
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def run(self):
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self.client.db.collection.find_one()
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self.passed = True # No exception raised.
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def do_find_one(client, nthreads):
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threads = [FindOne(client) for _ in range(nthreads)]
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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for t in threads:
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assert t.passed
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class TestMongosHA(unittest.TestCase):
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def mock_client(self, connect):
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return MockClient(
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standalones=[],
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members=[],
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mongoses=['a:1', 'b:2', 'c:3'],
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host='a:1,b:2,c:3',
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_connect=connect)
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def test_lazy_connect(self):
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nthreads = 10
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client = self.mock_client(False)
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self.assertEqual(0, len(client.nodes))
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# Trigger initial connection.
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do_find_one(client, nthreads)
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self.assertEqual(3, len(client.nodes))
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def test_reconnect(self):
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nthreads = 10
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client = self.mock_client(True)
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self.assertEqual(3, len(client.nodes))
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# Trigger reconnect.
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client.disconnect()
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do_find_one(client, nthreads)
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self.assertEqual(3, len(client.nodes))
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def test_failover(self):
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nthreads = 1
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# ['1:1', '2:2', '3:3', ...]
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mock_hosts = ['%d:%d' % (i, i) for i in range(50)]
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client = MockClient(
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standalones=[],
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members=[],
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mongoses=mock_hosts,
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host=','.join(mock_hosts))
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self.assertEqual(len(mock_hosts), len(client.nodes))
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# Our chosen mongos goes down.
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client.kill_host('%s:%s' % (client.host, client.port))
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# Trigger failover. AutoReconnect should be raised exactly once.
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errors = []
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passed = []
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def f():
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try:
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client.db.collection.find_one()
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except AutoReconnect:
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errors.append(True)
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# Second attempt succeeds.
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client.db.collection.find_one()
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passed.append(True)
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threads = [threading.Thread(target=f) for _ in range(nthreads)]
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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self.assertEqual(1, len(errors))
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self.assertEqual(nthreads, len(passed))
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# Down host is still in list.
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self.assertEqual(len(mock_hosts), len(client.nodes))
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if __name__ == "__main__":
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unittest.main()
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