Fixed common tags leaking state between spans (#9)

* fix bug where state is leaked between spans when using common tags feature * fix linting issue
ExpediaDotCom · Jan 29, 2020 · 0c1c699 · 0c1c699
1 parent 38dcb76
commit 0c1c699
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/haystack/tracer.py b/haystack/tracer.py
@@ -105,7 +105,8 @@ def start_span(self,
 
         # Set common tags
         if self._common_tags:
-            tags = {**self._common_tags, **tags} if tags else self._common_tags
+            tags = {**self._common_tags, **tags} if tags else \
+                self._common_tags.copy()
 
         return Span(self,
                     operation_name=operation_name,