229 lines
8.1 KiB
Python
229 lines
8.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Unit Tests for remote procedure calls using queue
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"""
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from nova import context
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from nova import flags
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from nova import log as logging
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from nova import rpc
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from nova import test
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FLAGS = flags.FLAGS
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LOG = logging.getLogger('nova.tests.rpc')
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class RpcTestCase(test.TestCase):
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def setUp(self):
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super(RpcTestCase, self).setUp()
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self.conn = rpc.Connection.instance(True)
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self.receiver = TestReceiver()
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self.consumer = rpc.TopicAdapterConsumer(connection=self.conn,
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topic='test',
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proxy=self.receiver)
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self.consumer.attach_to_eventlet()
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self.context = context.get_admin_context()
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def test_call_succeed(self):
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value = 42
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result = rpc.call(self.context, 'test', {"method": "echo",
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"args": {"value": value}})
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self.assertEqual(value, result)
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def test_call_succeed_despite_multiple_returns(self):
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value = 42
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result = rpc.call(self.context, 'test', {"method": "echo_three_times",
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"args": {"value": value}})
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self.assertEqual(value + 2, result)
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def test_call_succeed_despite_multiple_returns_yield(self):
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value = 42
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result = rpc.call(self.context, 'test',
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{"method": "echo_three_times_yield",
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"args": {"value": value}})
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self.assertEqual(value + 2, result)
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def test_multicall_succeed_once(self):
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value = 42
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result = rpc.multicall(self.context,
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'test',
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{"method": "echo",
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"args": {"value": value}})
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for i, x in enumerate(result):
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if i > 0:
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self.fail('should only receive one response')
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self.assertEqual(value + i, x)
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def test_multicall_succeed_three_times(self):
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value = 42
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result = rpc.multicall(self.context,
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'test',
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{"method": "echo_three_times",
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"args": {"value": value}})
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for i, x in enumerate(result):
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self.assertEqual(value + i, x)
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def test_multicall_succeed_three_times_yield(self):
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value = 42
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result = rpc.multicall(self.context,
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'test',
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{"method": "echo_three_times_yield",
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"args": {"value": value}})
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for i, x in enumerate(result):
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self.assertEqual(value + i, x)
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def test_context_passed(self):
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"""Makes sure a context is passed through rpc call."""
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value = 42
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result = rpc.call(self.context,
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'test', {"method": "context",
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"args": {"value": value}})
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self.assertEqual(self.context.to_dict(), result)
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def test_call_exception(self):
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"""Test that exception gets passed back properly.
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rpc.call returns a RemoteError object. The value of the
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exception is converted to a string, so we convert it back
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to an int in the test.
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"""
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value = 42
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self.assertRaises(rpc.RemoteError,
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rpc.call,
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self.context,
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'test',
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{"method": "fail",
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"args": {"value": value}})
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try:
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rpc.call(self.context,
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'test',
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{"method": "fail",
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"args": {"value": value}})
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self.fail("should have thrown rpc.RemoteError")
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except rpc.RemoteError as exc:
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self.assertEqual(int(exc.value), value)
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def test_nested_calls(self):
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"""Test that we can do an rpc.call inside another call."""
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class Nested(object):
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@staticmethod
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def echo(context, queue, value):
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"""Calls echo in the passed queue"""
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LOG.debug(_("Nested received %(queue)s, %(value)s")
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% locals())
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ret = rpc.call(context,
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queue,
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{"method": "echo",
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"args": {"value": value}})
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LOG.debug(_("Nested return %s"), ret)
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return value
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nested = Nested()
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conn = rpc.Connection.instance(True)
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consumer = rpc.TopicAdapterConsumer(connection=conn,
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topic='nested',
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proxy=nested)
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consumer.attach_to_eventlet()
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value = 42
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result = rpc.call(self.context,
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'nested', {"method": "echo",
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"args": {"queue": "test",
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"value": value}})
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self.assertEqual(value, result)
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def test_connectionpool_single(self):
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"""Test that ConnectionPool recycles a single connection."""
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conn1 = rpc.ConnectionPool.get()
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rpc.ConnectionPool.put(conn1)
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conn2 = rpc.ConnectionPool.get()
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rpc.ConnectionPool.put(conn2)
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self.assertEqual(conn1, conn2)
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def test_connectionpool_double(self):
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"""Test that ConnectionPool returns and reuses separate connections.
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When called consecutively we should get separate connections and upon
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returning them those connections should be reused for future calls
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before generating a new connection.
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"""
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conn1 = rpc.ConnectionPool.get()
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conn2 = rpc.ConnectionPool.get()
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self.assertNotEqual(conn1, conn2)
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rpc.ConnectionPool.put(conn1)
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rpc.ConnectionPool.put(conn2)
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conn3 = rpc.ConnectionPool.get()
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conn4 = rpc.ConnectionPool.get()
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self.assertEqual(conn1, conn3)
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self.assertEqual(conn2, conn4)
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def test_connectionpool_limit(self):
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"""Test connection pool limit and connection uniqueness."""
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max_size = FLAGS.rpc_conn_pool_size
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conns = []
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for i in xrange(max_size):
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conns.append(rpc.ConnectionPool.get())
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self.assertFalse(rpc.ConnectionPool.free_items)
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self.assertEqual(rpc.ConnectionPool.current_size,
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rpc.ConnectionPool.max_size)
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self.assertEqual(len(set(conns)), max_size)
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class TestReceiver(object):
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"""Simple Proxy class so the consumer has methods to call.
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Uses static methods because we aren't actually storing any state.
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"""
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@staticmethod
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def echo(context, value):
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"""Simply returns whatever value is sent in."""
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LOG.debug(_("Received %s"), value)
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return value
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@staticmethod
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def context(context, value):
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"""Returns dictionary version of context."""
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LOG.debug(_("Received %s"), context)
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return context.to_dict()
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@staticmethod
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def echo_three_times(context, value):
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context.reply(value)
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context.reply(value + 1)
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context.reply(value + 2)
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@staticmethod
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def echo_three_times_yield(context, value):
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yield value
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yield value + 1
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yield value + 2
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@staticmethod
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def fail(context, value):
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"""Raises an exception with the value sent in."""
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raise Exception(value)
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