feat: add concept of data-bearing type to ServerDescription

mongodb · Aug 13, 2019 · 852e14f · 852e14f
1 parent 5c8bf32
commit 852e14f
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/lib/core/sdam/server_description.js b/lib/core/sdam/server_description.js
@@ -19,6 +19,13 @@ const WRITABLE_SERVER_TYPES = new Set([
   ServerType.Mongos
 ]);
 
+const DATA_BEARING_SERVER_TYPES = new Set([
+  ServerType.RSPrimary,
+  ServerType.RSSecondary,
+  ServerType.Mongos,
+  ServerType.Standalone
+]);
+
 const ISMASTER_FIELDS = [
   'minWireVersion',
   'maxWireVersion',
@@ -99,6 +106,13 @@ class ServerDescription {
     return this.type === ServerType.RSSecondary || this.isWritable;
   }
 
+  /**
+   * @return {Boolean} Is this server data bearing
+   */
+  get isDataBearing() {
+    return DATA_BEARING_SERVER_TYPES.has(this.type);
+  }
+
   /**
    * @return {Boolean} Is this server available for writes
    */