span propagation

hiphop/service.py

@@ -47,7 +47,8 @@ def hip():
         print(ex)
         traceback.print_exc() 
         r = "END"
-    parent_span.finish()
+    if "finish" in dir(parent_span):
+        parent_span.finish()
     return f"hop-{ tier } -> { r }"
 
 app.run(host="0.0.0.0", port=80)