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# Copyright The OpenTelemetry Authors
#
# 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 unittest
from opencensus.trace.tracer import Tracer
from opencensus.trace.tracers.noop_tracer import NoopTracer
from opentelemetry.shim.opencensus import install_shim, uninstall_shim
from opentelemetry.shim.opencensus._shim_tracer import ShimTracer
class TestPatch(unittest.TestCase):
def setUp(self):
uninstall_shim()
def tearDown(self):
uninstall_shim()
def test_install_shim(self):
# Initially the shim is not installed. The Tracer class has no tracer property, it is
# instance level only.
self.assertFalse(hasattr(Tracer, "tracer"))
install_shim()
# The actual Tracer class should now be patched with a tracer property
self.assertTrue(hasattr(Tracer, "tracer"))
self.assertIsInstance(Tracer.tracer, property)
def test_install_shim_affects_existing_tracers(self):
# Initially the shim is not installed. A OC Tracer instance should have a NoopTracer
oc_tracer = Tracer()
self.assertIsInstance(oc_tracer.tracer, NoopTracer)
self.assertNotIsInstance(oc_tracer.tracer, ShimTracer)
install_shim()
# The property should cause existing instances to get the singleton ShimTracer
self.assertIsInstance(oc_tracer.tracer, ShimTracer)
def test_install_shim_affects_new_tracers(self):
install_shim()
# The property should cause existing instances to get the singleton ShimTracer
oc_tracer = Tracer()
self.assertIsInstance(oc_tracer.tracer, ShimTracer)
def test_uninstall_shim_resets_tracer(self):
install_shim()
uninstall_shim()
# The actual Tracer class should not be patched
self.assertFalse(hasattr(Tracer, "tracer"))
def test_uninstall_shim_resets_existing_tracers(self):
oc_tracer = Tracer()
orig = oc_tracer.tracer
install_shim()
uninstall_shim()
# Accessing the tracer member should no longer use the property, and instead should get
# its original NoopTracer
self.assertIs(oc_tracer.tracer, orig)
def test_uninstall_shim_resets_new_tracers(self):
install_shim()
uninstall_shim()
# Accessing the tracer member should get the NoopTracer
oc_tracer = Tracer()
self.assertIsInstance(oc_tracer.tracer, NoopTracer)
self.assertNotIsInstance(oc_tracer.tracer, ShimTracer)
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