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# Copyright 2022 The Matrix.org Foundation C.I.C.
#
# 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.
from twisted.internet import defer
from twisted.test.proto_helpers import MemoryReactorClock
from synapse.logging.context import make_deferred_yieldable, run_in_background
from synapse.logging.tracing import start_active_span
from synapse.util import Clock
from tests.unittest import TestCase
try:
import opentelemetry
import opentelemetry.sdk.trace
import opentelemetry.sdk.trace.export
import opentelemetry.sdk.trace.export.in_memory_span_exporter
import opentelemetry.trace
import opentelemetry.trace.propagation
except ImportError:
opentelemetry = None # type: ignore[assignment]
class TracingTestCase(TestCase):
"""
Test logging contexts and active opentelemetry spans.
"""
if opentelemetry is None:
skip = "Requires opentelemetry" # type: ignore[unreachable]
def setUp(self) -> None:
# since this is a unit test, we don't really want to mess around with the
# global variables that power opentelemetry. We create our own tracer instance
# and test with it.
self._tracer_provider = opentelemetry.sdk.trace.TracerProvider()
self._exporter = (
opentelemetry.sdk.trace.export.in_memory_span_exporter.InMemorySpanExporter()
)
processor = opentelemetry.sdk.trace.export.SimpleSpanProcessor(self._exporter)
self._tracer_provider.add_span_processor(processor)
self._tracer = self._tracer_provider.get_tracer(__name__)
def test_start_active_span(self) -> None:
# This means no current span
self.assertEqual(
opentelemetry.trace.get_current_span(), opentelemetry.trace.INVALID_SPAN
)
# start_active_span should start and activate a span.
with start_active_span("new-span", tracer=self._tracer) as span:
self.assertEqual(opentelemetry.trace.get_current_span(), span)
# ... but leaving it unsets the active span, and finishes the span.
self.assertEqual(
opentelemetry.trace.get_current_span(), opentelemetry.trace.INVALID_SPAN
)
# the span should have been reported
self.assertListEqual(
[span.name for span in self._exporter.get_finished_spans()], ["new-span"]
)
def test_nested_spans(self) -> None:
"""Starting two spans off inside each other should work"""
with start_active_span("root_span", tracer=self._tracer) as root_span:
self.assertEqual(opentelemetry.trace.get_current_span(), root_span)
with start_active_span(
"child_span1",
tracer=self._tracer,
) as child_span1:
self.assertEqual(
opentelemetry.trace.get_current_span(),
child_span1,
"child_span1 was not activated",
)
with start_active_span(
"child_span2",
tracer=self._tracer,
) as child_span2:
self.assertEqual(
opentelemetry.trace.get_current_span(), child_span2
)
# the root scope should be restored
self.assertEqual(opentelemetry.trace.get_current_span(), root_span)
# Active span is unset now that we're outside of the `with` scopes
self.assertEqual(
opentelemetry.trace.get_current_span(), opentelemetry.trace.INVALID_SPAN
)
# the spans should be reported in order of their finishing.
self.assertListEqual(
[span.name for span in self._exporter.get_finished_spans()],
["child_span2", "child_span1", "root_span"],
)
def test_side_by_side_spans(self) -> None:
with start_active_span("span1", tracer=self._tracer), start_active_span(
"span2", tracer=self._tracer
) as span2:
# We expect the last span in `with` list to be active
self.assertEqual(opentelemetry.trace.get_current_span(), span2)
# Active span is unset now that we're outside of the `with` scopes
self.assertEqual(
opentelemetry.trace.get_current_span(), opentelemetry.trace.INVALID_SPAN
)
# the spans should be reported in order of their finishing.
self.assertListEqual(
[span.name for span in self._exporter.get_finished_spans()],
["span2", "span1"],
)
def test_overlapping_spans(self) -> None:
"""Overlapping spans which are not neatly nested should work"""
reactor = MemoryReactorClock()
clock = Clock(reactor)
async def task(i: int):
with start_active_span(
f"task{i}",
tracer=self._tracer,
) as span:
self.assertEqual(opentelemetry.trace.get_current_span(), span)
await clock.sleep(4)
self.assertEqual(opentelemetry.trace.get_current_span(), span)
async def root():
with start_active_span("root_span", tracer=self._tracer) as root_span:
self.assertEqual(opentelemetry.trace.get_current_span(), root_span)
d1 = run_in_background(task, 1)
await clock.sleep(2)
d2 = run_in_background(task, 2)
# because we did run_in_background, the active span should still be the
# root.
self.assertEqual(opentelemetry.trace.get_current_span(), root_span)
await make_deferred_yieldable(
defer.gatherResults([d1, d2], consumeErrors=True)
)
self.assertEqual(opentelemetry.trace.get_current_span(), root_span)
# start the test off
root_defferred = defer.ensureDeferred(root())
# let the tasks complete
reactor.pump((2,) * 8)
self.successResultOf(root_defferred)
# Active span is unset now that we're outside of the `with` scopes
self.assertEqual(
opentelemetry.trace.get_current_span(), opentelemetry.trace.INVALID_SPAN
)
# the spans should be reported in order of their finishing: task 1, task 2,
# root.
self.assertListEqual(
[span.name for span in self._exporter.get_finished_spans()],
["task1", "task2", "root_span"],
)
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