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from __future__ import print_function
import asyncio
import opentracing
from opentracing.ext import tags
from opentracing.mocktracer import MockTracer
from opentracing.scope_managers.contextvars import ContextVarsScopeManager
from ..testcase import OpenTracingTestCase
from ..utils import get_logger, get_one_by_tag, stop_loop_when
logger = get_logger(__name__)
class Server(object):
def __init__(self, *args, **kwargs):
tracer = kwargs.pop('tracer')
queue = kwargs.pop('queue')
super(Server, self).__init__(*args, **kwargs)
self.tracer = tracer
self.queue = queue
async def run(self):
value = await self.queue.get()
self.process(value)
def process(self, message):
logger.info('Processing message in server')
ctx = self.tracer.extract(opentracing.Format.TEXT_MAP, message)
with self.tracer.start_active_span('receive',
child_of=ctx) as scope:
scope.span.set_tag(tags.SPAN_KIND, tags.SPAN_KIND_RPC_SERVER)
class Client(object):
def __init__(self, tracer, queue):
self.tracer = tracer
self.queue = queue
async def send(self):
with self.tracer.start_active_span('send') as scope:
scope.span.set_tag(tags.SPAN_KIND, tags.SPAN_KIND_RPC_CLIENT)
message = {}
self.tracer.inject(scope.span.context,
opentracing.Format.TEXT_MAP,
message)
await self.queue.put(message)
logger.info('Sent message from client')
class TestAsyncioContextVars(OpenTracingTestCase):
def setUp(self):
self.tracer = MockTracer(ContextVarsScopeManager())
self.queue = asyncio.Queue()
self.loop = asyncio.get_event_loop()
self.server = Server(tracer=self.tracer, queue=self.queue)
def test(self):
client = Client(self.tracer, self.queue)
self.loop.create_task(self.server.run())
self.loop.create_task(client.send())
stop_loop_when(self.loop,
lambda: len(self.tracer.finished_spans()) >= 2)
self.loop.run_forever()
spans = self.tracer.finished_spans()
self.assertIsNotNone(get_one_by_tag(spans,
tags.SPAN_KIND,
tags.SPAN_KIND_RPC_SERVER))
self.assertIsNotNone(get_one_by_tag(spans,
tags.SPAN_KIND,
tags.SPAN_KIND_RPC_CLIENT))
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