Clear global callback collections after use

Author: jonmmease

dash/dash.py

@@ -714,6 +714,9 @@ def _generate_scripts_html(self):
             )
         )
 
+        global_inline_scripts = list(_callback.GLOBAL_INLINE_SCRIPTS)
+        _callback.GLOBAL_INLINE_SCRIPTS.clear()
+
         return "\n".join(
             [
                 format_tag("script", src)
@@ -723,7 +726,7 @@ def _generate_scripts_html(self):
             ]
             + [
                 "<script>{}</script>".format(src)
-                for src in (self._inline_scripts + _callback.GLOBAL_INLINE_SCRIPTS)
+                for src in (self._inline_scripts + global_inline_scripts)
             ]
         )
 
@@ -1343,7 +1346,7 @@ def _setup_server(self):
         self._generate_css_dist_html()
 
         # Copy over global callback data structures assigned with `dash.callback`
-        for k in _callback.GLOBAL_CALLBACK_MAP:
+        for k in list(_callback.GLOBAL_CALLBACK_MAP):
 
             if k in self.callback_map:
                 raise DuplicateCallback(
@@ -1353,9 +1356,10 @@ def _setup_server(self):
                     + "assigned with `app.callback`."
                 )
 
-            self.callback_map[k] = _callback.GLOBAL_CALLBACK_MAP[k]
+            self.callback_map[k] = _callback.GLOBAL_CALLBACK_MAP.pop(k)
 
         self._callback_list.extend(_callback.GLOBAL_CALLBACK_LIST)
+        _callback.GLOBAL_CALLBACK_LIST.clear()
 
     def _add_assets_resource(self, url_path, file_path):
         res = {"asset_path": url_path, "filepath": file_path}