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from __future__ import print_function
import asyncio
from opentracing.mocktracer import MockTracer
from ..testcase import OpenTracingTestCase
from opentracing.scope_managers.contextvars import ContextVarsScopeManager
from ..utils import stop_loop_when
class TestAsyncioContextVars(OpenTracingTestCase):
def setUp(self):
self.tracer = MockTracer(ContextVarsScopeManager())
self.loop = asyncio.get_event_loop()
def test_main(self):
# Start an isolated task and query for its result -and finish it-
# in another task/thread
span = self.tracer.start_span('initial')
self.submit_another_task(span)
stop_loop_when(self.loop,
lambda: len(self.tracer.finished_spans()) >= 3)
self.loop.run_forever()
initial, subtask, task = self.tracer.finished_spans()
self.assertEmptySpan(initial, 'initial')
self.assertEmptySpan(subtask, 'subtask')
self.assertEmptySpan(task, 'task')
# task/subtask are part of the same trace,
# and subtask is a child of task
self.assertSameTrace(subtask, task)
self.assertIsChildOf(subtask, task)
# initial task is not related in any way to those two tasks
self.assertNotSameTrace(initial, subtask)
self.assertHasNoParent(initial)
async def task(self, span):
# Create a new Span for this task
with self.tracer.start_active_span('task'):
with self.tracer.scope_manager.activate(span, True):
# Simulate work strictly related to the initial Span
pass
# Use the task span as parent of a new subtask
with self.tracer.start_active_span('subtask'):
pass
def submit_another_task(self, span):
self.loop.create_task(self.task(span))
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