Rename infer_jupyter_config to infer_jupyter_proxy_config and raise exception if

config can not be inferred

Author: jonmmease

jupyter_dash/comms.py

@@ -30,7 +30,7 @@ def _jupyter_comm_response_received():
     return bool(_jupyter_config)
 
 
-def _request_jupyter_config(timeout=1):
+def _request_jupyter_proxy_config(timeout=2):
     # Heavily inspired by implementation of CaptureExecution in the
     if _dash_comm.kernel is None:
         # Not in jupyter server setting
@@ -59,7 +59,10 @@ def capture_event(stream, ident, parent):
     while True:
         if (time.time() - t0) > timeout:
             # give up
-            break
+            raise EnvironmentError(
+                "Unable to communicate with the jupyter_dash notebook or JupyterLab \n"
+                "extension required to infer proxy configuration."
+            )
         if _jupyter_comm_response_received():
             break
 

jupyter_dash/jupyter_app.py

@@ -8,13 +8,20 @@
 
 
 from IPython.display import IFrame, display
-from .comms import _dash_comm, _jupyter_config, _request_jupyter_config
+from .comms import _dash_comm, _jupyter_config, _request_jupyter_proxy_config
 
 
 class JupyterDash(dash.Dash):
     @classmethod
-    def infer_jupyter_config(cls):
-        _request_jupyter_config()
+    def infer_jupyter_proxy_config(cls):
+        try:
+            import jupyter_server_proxy
+        except Exception:
+            raise ImportError(
+                "The infer_jupyter_proxy_config function requires the"
+                "jupyter_server_proxy Python package"
+            )
+        _request_jupyter_proxy_config()
 
     def __init__(self, server_url=None, **kwargs):