Add functional tests

These add some coverage to functionality not covered by the regular
unit tests, but I think they can't be run in the gate because they
use sudo.

Change-Id: Ic62c95b83f68f94328deb00227b7eabf249ce898

.stestr.conf

@@ -1,3 +1,3 @@
 [DEFAULT]
-test_path=./oslo_privsep/tests
+test_path=${OS_TEST_PATH:-./oslo_privsep/tests}
 top_path=./

oslo_privsep/functional/__init__.py

@@ -0,0 +1,8 @@
+import os.path
+
+
+def load_tests(loader, tests, pattern):
+    this_dir = os.path.dirname(__file__)
+    new_tests = loader.discover(start_dir=this_dir, pattern=pattern)
+    tests.addTests(new_tests)
+    return tests

oslo_privsep/functional/test_daemon.py

@@ -0,0 +1,74 @@
+# Copyright 2019 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import os
+import time
+import unittest
+
+from oslo_config import fixture as config_fixture
+from oslotest import base
+
+from oslo_privsep import priv_context
+
+
+test_context = priv_context.PrivContext(
+    __name__,
+    cfg_section='privsep',
+    pypath=__name__ + '.test_context',
+    capabilities=[],
+)
+
+
+@test_context.entrypoint
+def sleep():
+    # We don't want the daemon to be able to handle these calls too fast.
+    time.sleep(.001)
+
+
+@test_context.entrypoint
+def one():
+    return 1
+
+
+@test_context.entrypoint
+def logs():
+    logging.warning('foo')
+
+
+class TestDaemon(base.BaseTestCase):
+    def setUp(self):
+        super(TestDaemon, self).setUp()
+        venv_path = os.environ['VIRTUAL_ENV']
+        self.cfg_fixture = self.useFixture(config_fixture.Config())
+        self.cfg_fixture.config(
+            group='privsep',
+            helper_command='sudo -E %s/bin/privsep-helper' % venv_path)
+        priv_context.init()
+
+    def test_concurrency(self):
+        # Throw a large number of simultaneous requests at the daemon to make
+        # sure it can can handle them.
+        for i in range(1000):
+            sleep()
+        # Make sure the daemon is still working
+        self.assertEqual(1, one())
+
+    def test_logging(self):
+        logs()
+        self.assertIn('foo', self.log_fixture.logger.output)
+
+
+if __name__ == '__main__':
+    unittest.main()

tox.ini

@@ -78,3 +78,9 @@ deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
+
+[testenv:functional]
+basepython = python3
+setenv =
+    OS_TEST_PATH=./oslo_privsep/functional
+    OS_LOG_CAPTURE=1