refactor: moved connect/disconnect events from provider to client

example/daemon/www/js/wsfs/client.js

@@ -6,21 +6,19 @@ export class Client {
     constructor(provider) {
         this._provider = provider;
         this._ws = null;
-        this.isConnected = false;
+        this.onopen = () => { };
+        this.onclose = () => { };
+        this.onerror = () => { };
     }
 
     connectTo(url) {
         this.disconnect();
 
         this._ws = new WebSocket(url, Client._PROTOCOL);
-        this._ws.onopen = () => {
-            this.isConnected = true;
-            this._provider.connected(); 
-        };
-        this._ws.onclose = () => {
-            this.isConnected = false;
-            this._provider.disconnected();
-        };
+        this._ws.onopen = this.onopen;
+        this._ws.onclose = this.onclose;
+        this._ws.onerror = this.onerror;
+
         this._ws.onmessage = (message) => {
             this._onmessage(message);
         };
@@ -29,9 +27,14 @@ export class Client {
     disconnect() {
         if (this._ws) {
             this._ws.close();
+            this._ws = null;
         }
     }
 
+    isConnected() {
+        return ((this._ws) && (this._ws.readyState === WebSocket.OPEN));
+    }
+
     _onmessage(message) {
         try {
             const request = JSON.parse(message.data);

example/daemon/www/js/wsfs/provider.js

@@ -4,14 +4,6 @@ import { BadState } from "./bad_state.js";
 
 export class Provider {
 
-    connected() {
-        // empty
-    }
-
-    disconnected() {
-        // empty
-    }
-
     async lookup(_parent, _name) {
         throw new BadState(BadState.NOT_IMPLEMENTED);
     }