Работа над WebWorker и DbCreator

server/core/WebWorker.js

@@ -0,0 +1,50 @@
+const WorkerState = require('./WorkerState');
+
+//server states:
+const ssNormal = 'normal';
+const ssDbLoading = 'db_loading';
+
+//singleton
+let instance = null;
+
+class WebWorker {
+    constructor(config) {
+        if (!instance) {
+            this.config = config;
+            this.workerState = new WorkerState();
+            
+            this.wState = this.workerState.getControl('server_state');
+            this.myState = '';
+
+            this.loadOrCreateDb();//no await
+
+            instance = this;
+        }
+
+        return instance;
+    }
+
+    checkMyState() {
+        if (this.myState != ssNormal)
+            throw new Error('server_busy');
+    }
+
+    setMyState(newState) {
+        this.myState = newState;
+        this.wState.set({state: newState});
+    }
+
+    async loadOrCreateDb() {
+        this.setMyState(ssDbLoading);
+
+        try {
+            //
+        } catch (e) {
+            //
+        } finally {
+            this.setMyState(ssNormal);
+        }
+    }
+}
+
+module.exports = WebWorker;