From 7215f852b8b591d20b4eaab39fbb8582ad46557e Mon Sep 17 00:00:00 2001
From: Blake Harnden <32446120+bharnden@users.noreply.github.com>
Date: Tue, 23 Jun 2020 13:34:40 -0700
Subject: [PATCH] grpc: added check for emane pathloss when nem id is None and
 throw an error

---
 daemon/core/api/grpc/grpcutils.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/daemon/core/api/grpc/grpcutils.py b/daemon/core/api/grpc/grpcutils.py
index b63cb895..8df545cd 100644
--- a/daemon/core/api/grpc/grpcutils.py
+++ b/daemon/core/api/grpc/grpcutils.py
@@ -487,4 +487,8 @@ def get_nem_id(node: CoreNode, iface_id: int, context: ServicerContext) -> int:
     if not isinstance(net, EmaneNet):
         message = f"{node.name} interface {iface_id} is not an EMANE network"
         context.abort(grpc.StatusCode.INVALID_ARGUMENT, message)
-    return net.getnemid(iface)
+    nem_id = net.getnemid(iface)
+    if nem_id is None:
+        message = f"{node.name} interface {iface_id} nem id does not exist"
+        context.abort(grpc.StatusCode.INVALID_ARGUMENT, message)
+    return nem_id