test_client_server

Client-Server example.

This example shows a Span created by a Client, which will send a Message/SpanContext to a Server, which will in turn extract such context and use it as parent of a new (server-side) Span.

Client.send() is used to send messages and inject the SpanContext using the TEXT_MAP format, and Server.process() will process received messages and will extract the context used as parent.

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)
        self.queue.put(message)