Add try/catch around node execution.

networkfox/functional.py

@@ -9,22 +9,32 @@
 from .modifiers import optional
 
 
+# class GraphExecutionException(Exception):
+
+#     def __init__(self, node_name, exception):
+#         self.node_name = node_name
+#         self.exception = exception
+
+
 class FunctionalOperation(Operation):
     def __init__(self, **kwargs):
         self.fn = kwargs.pop('fn')
         Operation.__init__(self, **kwargs)
 
     def _compute(self, named_inputs, outputs=None):
-
         inputs = [named_inputs[d.name] for d in self.needs if not d.optional]
 
         # Find any optional inputs in named_inputs.  Get only the ones that
         # are present there, no extra `None`s.
         optionals = {n.name: named_inputs[n.name] for n in self.needs if n.optional and n.name in named_inputs}
-
         # Combine params and optionals into one big glob of keyword arguments.
         kwargs = {k: v for d in (self.params, optionals) for k, v in d.items()}
-        result = self.fn(*inputs, **kwargs)
+        try:
+            result = self.fn(*inputs, **kwargs)
+        except Exception as e:
+            e.node_name = self.name
+            raise e
+
         if len(self.provides) == 1:
             result = [result]