Simple example of how to use the new request tracing

request_tracing.py

async def request_start(session, trace_context, method, host, port, headers):
    trace_context.start = loop.time()
    headers['X-Request-id'] = 'request_id'

async def request_stop(session, trace_context, response):
    print("request type {}".format(trace_context.query))
    print("request finsihed with {} status code".format(response.status_code))
    print("request took {}".format(loop.time() - trace_context.start))

async def request_exception(session, trace_context, exc):
    print("request_exception {}".format(exc))


session = ClientSession()
session.on_request_start.add(request_start)
session.on_request_stop.add(request_stop)
session.on_request_exception.add(request_exception)

async def foo():
    resp = await session.get(
        "http://microservice_foo.local/search?q=people",
        trace_context=SimpleNamespace(query='people')
    )