Increase EventEmitter listener limit

docs/event-emitter-listener-limit.md

@@ -0,0 +1,8 @@
+# EventEmitter listener limit
+
+`NetworkClass` sets a higher listener limit by calling `this.setMaxListeners(100)` in its constructor.
+This enables many modules to attach network event handlers without triggering Node's default
+`MaxListenersExceededWarning` after ten listeners. The value of 100 was selected as a reasonable upper bound.
+
+If the application logs show `MaxListenersExceededWarning`, review the registered events and consider
+adjusting the limit accordingly.

src/network/index.ts

@@ -72,6 +72,11 @@ export class NetworkClass extends EventEmitter {
 
   constructor(config: Shardus.StrictServerConfiguration, logger: Logger) {
     super()
+    // Allow more listeners to attach to this EventEmitter to avoid memory leak warnings
+    // if various modules register network-related events.
+    // 100 was chosen as a reasonable upper bound; monitor logs for MaxListenersExceeded warnings
+    // and adjust if needed.
+    this.setMaxListeners(100)
     this.app = express()
     this.sn = null
     this.logger = logger