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https://mau.dev/maunium/synapse.git
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31b554c297
`start_active_span` was inconsistent as to whether it would activate the span immediately, or wait for `scope.__enter__` to happen (it depended on whether the current logcontext already had an associated scope). The inconsistency was rather confusing if you were hoping to set up a couple of separate spans before activating either. Looking at the other implementations of opentracing `ScopeManager`s, the intention is that it *should* be activated immediately, as the name implies. Indeed, the idea is that you don't have to use the scope as a contextmanager at all - you can just call `.close` on the result. Hence, our cleanup has to happen in `.close` rather than `.__exit__`. So, the main change here is to ensure that `start_active_span` does activate the span, and that `scope.close()` does close the scope. We also add some tests, which requires a `tracer` param so that we don't have to rely on the global variable in unit tests.
184 lines
6.5 KiB
Python
184 lines
6.5 KiB
Python
# Copyright 2022 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from twisted.test.proto_helpers import MemoryReactorClock
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from synapse.logging.context import (
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LoggingContext,
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make_deferred_yieldable,
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run_in_background,
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)
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from synapse.logging.opentracing import (
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start_active_span,
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start_active_span_follows_from,
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)
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from synapse.util import Clock
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try:
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from synapse.logging.scopecontextmanager import LogContextScopeManager
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except ImportError:
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LogContextScopeManager = None # type: ignore
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try:
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import jaeger_client
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except ImportError:
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jaeger_client = None # type: ignore
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from tests.unittest import TestCase
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class LogContextScopeManagerTestCase(TestCase):
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if LogContextScopeManager is None:
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skip = "Requires opentracing" # type: ignore[unreachable]
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if jaeger_client is None:
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skip = "Requires jaeger_client" # type: ignore[unreachable]
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def setUp(self) -> None:
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# since this is a unit test, we don't really want to mess around with the
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# global variables that power opentracing. We create our own tracer instance
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# and test with it.
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scope_manager = LogContextScopeManager({})
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config = jaeger_client.config.Config(
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config={}, service_name="test", scope_manager=scope_manager
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)
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self._reporter = jaeger_client.reporter.InMemoryReporter()
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self._tracer = config.create_tracer(
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sampler=jaeger_client.ConstSampler(True),
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reporter=self._reporter,
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)
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def test_start_active_span(self) -> None:
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# the scope manager assumes a logging context of some sort.
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with LoggingContext("root context"):
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self.assertIsNone(self._tracer.active_span)
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# start_active_span should start and activate a span.
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scope = start_active_span("span", tracer=self._tracer)
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span = scope.span
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self.assertEqual(self._tracer.active_span, span)
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self.assertIsNotNone(span.start_time)
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# entering the context doesn't actually do a whole lot.
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with scope as ctx:
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self.assertIs(ctx, scope)
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self.assertEqual(self._tracer.active_span, span)
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# ... but leaving it unsets the active span, and finishes the span.
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self.assertIsNone(self._tracer.active_span)
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self.assertIsNotNone(span.end_time)
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# the span should have been reported
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self.assertEqual(self._reporter.get_spans(), [span])
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def test_nested_spans(self) -> None:
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"""Starting two spans off inside each other should work"""
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with LoggingContext("root context"):
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with start_active_span("root span", tracer=self._tracer) as root_scope:
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self.assertEqual(self._tracer.active_span, root_scope.span)
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scope1 = start_active_span(
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"child1",
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tracer=self._tracer,
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)
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self.assertEqual(
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self._tracer.active_span, scope1.span, "child1 was not activated"
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)
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self.assertEqual(
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scope1.span.context.parent_id, root_scope.span.context.span_id
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)
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scope2 = start_active_span_follows_from(
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"child2",
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contexts=(scope1,),
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tracer=self._tracer,
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)
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self.assertEqual(self._tracer.active_span, scope2.span)
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self.assertEqual(
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scope2.span.context.parent_id, scope1.span.context.span_id
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)
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with scope1, scope2:
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pass
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# the root scope should be restored
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self.assertEqual(self._tracer.active_span, root_scope.span)
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self.assertIsNotNone(scope2.span.end_time)
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self.assertIsNotNone(scope1.span.end_time)
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self.assertIsNone(self._tracer.active_span)
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# the spans should be reported in order of their finishing.
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self.assertEqual(
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self._reporter.get_spans(), [scope2.span, scope1.span, root_scope.span]
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)
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def test_overlapping_spans(self) -> None:
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"""Overlapping spans which are not neatly nested should work"""
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reactor = MemoryReactorClock()
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clock = Clock(reactor)
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scopes = []
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async def task(i: int):
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scope = start_active_span(
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f"task{i}",
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tracer=self._tracer,
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)
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scopes.append(scope)
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self.assertEqual(self._tracer.active_span, scope.span)
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await clock.sleep(4)
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self.assertEqual(self._tracer.active_span, scope.span)
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scope.close()
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async def root():
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with start_active_span("root span", tracer=self._tracer) as root_scope:
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self.assertEqual(self._tracer.active_span, root_scope.span)
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scopes.append(root_scope)
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d1 = run_in_background(task, 1)
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await clock.sleep(2)
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d2 = run_in_background(task, 2)
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# because we did run_in_background, the active span should still be the
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# root.
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self.assertEqual(self._tracer.active_span, root_scope.span)
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await make_deferred_yieldable(
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defer.gatherResults([d1, d2], consumeErrors=True)
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)
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self.assertEqual(self._tracer.active_span, root_scope.span)
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with LoggingContext("root context"):
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# start the test off
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d1 = defer.ensureDeferred(root())
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# let the tasks complete
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reactor.pump((2,) * 8)
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self.successResultOf(d1)
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self.assertIsNone(self._tracer.active_span)
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# the spans should be reported in order of their finishing: task 1, task 2,
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# root.
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self.assertEqual(
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self._reporter.get_spans(),
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[scopes[1].span, scopes[2].span, scopes[0].span],
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)
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