fix: always return empty array for selection on unknown topology

Topology types of `Unknown` should always return an empty set of servers for server selection using a read preference NODE-2549
mongodb · Apr 8, 2020 · f9e786a · f9e786a
1 parent d6f3001
commit f9e786a
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/lib/core/sdam/server_selection.js b/lib/core/sdam/server_selection.js
@@ -186,6 +186,10 @@ function readPreferenceServerSelector(readPreference) {
       );
     }
 
+    if (topologyDescription.type === TopologyType.Unknown) {
+      return [];
+    }
+
     if (
       topologyDescription.type === TopologyType.Single ||
       topologyDescription.type === TopologyType.Sharded