def prepare_response(self, span, downstream):
observed_span = get_observed_span(span)
trace_response = TraceResponse(span=observed_span, notImplementedError='')
if downstream:
with request_context.span_in_stack_context(span):
future = self.call_downstream(span, downstream)
downstream_trace_resp = yield future
trace_response.downstream = downstream_trace_resp
raise tornado.gen.Return(trace_response)
def run_coroutine_with_span(span, coro, *args, **kwargs):
"""Wrap the execution of a Tornado coroutine func in a tracing span.
This makes the span available through the get_current_span() function.
:param span: The tracing span to expose.
:param coro: Co-routine to execute in the scope of tracing span.
:param args: Positional args to func, if any.
:param kwargs: Keyword args to func, if any.
"""
with span_in_stack_context(span):
return coro(*args, **kwargs)
def run_coroutine_with_span(span, coro, *args, **kwargs):
"""Wrap the execution of a Tornado coroutine func in a tracing span.
This makes the span available through the get_current_span() function.
:param span: The tracing span to expose.
:param coro: Co-routine to execute in the scope of tracing span.
:param args: Positional args to func, if any.
:param kwargs: Keyword args to func, if any.
"""
with span_in_stack_context(span):
return coro(*args, **kwargs)
def dispatch_wrapper(self, incoming):
message = incoming.message
method = message.get('method')
namespace = message.get('namespace')
log.debug("dispatch target method: {}, namespace: {}".format(
method, namespace))
span = before_dispatcher(incoming)
# Load span to local threading request context
with span_in_stack_context(span):
ret = _RPCDispatcher_dispatch(self, incoming)
log.debug("Dispatch done")
span.finish()
return ret
def test__request_context_is_thread_safe(tracer):
"""
Port of Uber's internal tornado-extras (by @sema).
This test illustrates that the default Tornado's StackContext
is not thread-safe. The test can be made to fail by commenting
out these lines in the ThreadSafeStackContext constructor:
if hasattr(self, 'contexts'):
# only patch if context exists
self.contexts = LocalContexts()
"""
num_iterations = 1000
num_workers = 10
exception = [0]
def async_task():
time.sleep(0.001)
assert get_current_span() is not None
class Worker(Thread):
def __init__(self, fn):
super(Worker, self).__init__()
self.fn = fn
def run(self):
try:
for _ in range(0, num_iterations):
self.fn()
except Exception as e:
exception[0] = e
raise
with span_in_stack_context(span='span'):
workers = []
for i in range(0, num_workers):
worker = Worker(wrap(async_task))
workers.append(worker)
for worker in workers:
worker.start()
for worker in workers:
worker.join()
if exception[0]:
raise exception[0]
def __call__(self, request, handler, next_mw):
# TODO find out if the route can be read from handler
self._initializer.initialize_tracer()
request_wrapper = http_server.TornadoRequestWrapper(request=request)
span = http_server.before_request(request=request_wrapper)
span.set_operation_name("{0}: {1}".format(request.method,
handler.__class__.__name__))
try:
with request_context.span_in_stack_context(span=span):
next_mw_future = next_mw() # cannot yield inside StackContext
yield next_mw_future
except Exception as e:
span.set_tag('error', True)
span.log_event(event='error', payload=e)
raise
finally:
span.finish()
def post(self):
span = self._get_span()
if span:
try:
with span_in_stack_context(span):
res = self.client_channel.json(
service='handler2',
hostport=self.request.body,
endpoint="endpoint2",
)
res = yield res
body = res.body
except Exception as e:
traceback.print_exc()
self.write('ERROR: %s' % e)
self.set_status(200)
return
else:
self.write(body)
self.set_status(200)
finally:
span.finish()
def post(self):
span = self._get_span()
if span:
try:
with span_in_stack_context(span):
res = self.client_channel.json(
service='handler2',
hostport=self.request.body,
endpoint="endpoint2",
)
res = yield res
body = res.body
except Exception as e:
traceback.print_exc()
self.write('ERROR: %s' % e)
self.set_status(200)
return
else:
self.write(body)
self.set_status(200)
finally:
span.finish()