control setup

database/index.ts

@@ -13,9 +13,28 @@ class ChatCacheDatabaseController {
     private readonly chatListKey = "chat-list";
     private readonly chatMessageKey = "chat-message";
 
+    private setuping = false;
+
+    private waitSetupCompleted() {
+        return new Promise<void>(resolve => {
+            const checker = () => {
+                if (!this.setuping) {
+                    resolve();
+                } else {
+                    setTimeout(() => checker(), 200);
+                }
+            };
+            checker();
+        });
+    }
+
     public setup(uid: string) {
+        if (this.setuping) {
+            return this.waitSetupCompleted();
+        }
         return new Promise<void>((resolve) => {
             if (uid && indexedDB) {
+                this.setuping = true;
                 const r = indexedDB.open(
                     "u-" + (this.uid = uid),
                     this.listVersion
@@ -33,6 +52,7 @@ class ChatCacheDatabaseController {
                             console.error(e);
                         }
                     }
+                    this.setuping = false;
                     resolve();
                 };
                 r.onsuccess = function(e) {