80 lines
2.8 KiB
Python
80 lines
2.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2013 Red Hat, Inc.
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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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import contextlib
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import eventlet
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import eventlet.timeout
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import fixtures
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from neutron.agent.linux import async_process
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from neutron.tests import base
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class TestAsyncProcess(base.BaseTestCase):
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def setUp(self):
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super(TestAsyncProcess, self).setUp()
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self.test_file_path = self.useFixture(
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fixtures.TempDir()).join("test_async_process.tmp")
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self.data = [str(x) for x in xrange(4)]
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with file(self.test_file_path, 'w') as f:
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f.writelines('%s\n' % item for item in self.data)
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def _check_stdout(self, proc):
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# Ensure that all the output from the file is read
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output = []
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while output != self.data:
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new_output = list(proc.iter_stdout())
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if new_output:
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output += new_output
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eventlet.sleep(0.01)
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@contextlib.contextmanager
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def assert_max_execution_time(self, max_execution_time=5):
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with eventlet.timeout.Timeout(max_execution_time, False):
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yield
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return
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self.fail('Execution of this test timed out')
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def test_stopping_async_process_lifecycle(self):
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with self.assert_max_execution_time():
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proc = async_process.AsyncProcess(['tail', '-f',
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self.test_file_path])
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proc.start()
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self._check_stdout(proc)
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proc.stop()
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# Ensure that the process and greenthreads have stopped
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proc._process.wait()
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self.assertEqual(proc._process.returncode, -9)
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for watcher in proc._watchers:
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watcher.wait()
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def test_async_process_respawns(self):
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with self.assert_max_execution_time():
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proc = async_process.AsyncProcess(['tail', '-f',
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self.test_file_path],
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respawn_interval=0)
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proc.start()
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# Ensure that the same output is read twice
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self._check_stdout(proc)
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pid = proc._get_pid_to_kill()
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proc._kill_process(pid)
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self._check_stdout(proc)
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proc.stop()
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