Protect against short tuples (#141)

Author: pglombardo

instana/instrumentation/asynqp.py

@@ -30,7 +30,9 @@ def publish_with_instana(wrapped, instance, argv, kwargs):
                 scope.span.set_tag("exchange", instance.name)
                 scope.span.set_tag("sort", "publish")
                 scope.span.set_tag("address", host + ":" + str(port) )
-                scope.span.set_tag("key", argv[1])
+
+                if len(argv) > 1 and argv[1] is not None:
+                    scope.span.set_tag("key", argv[1])
 
                 rv = wrapped(*argv, **kwargs)
             except Exception as e:

tests/test_asynqp.py

@@ -66,7 +66,7 @@ def test_publish(self):
         @asyncio.coroutine
         def test():
             with async_tracer.start_active_span('test'):
-                msg = asynqp.Message({'hello': 'world'})
+                msg = asynqp.Message({'hello': 'world'}, content_type='application/json')
                 self.exchange.publish(msg, 'routing.key')
 
         self.loop.run_until_complete(test())