feat: initial persistence (#3)

packages/bolt/app/lib/persistence/db.ts

@@ -0,0 +1,67 @@
+import type { ChatHistory } from './useChatHistory';
+import type { Message } from 'ai';
+import { createScopedLogger } from '~/utils/logger';
+
+const logger = createScopedLogger('ChatHistory');
+
+// this is used at the top level and never rejects
+export async function openDatabase(): Promise<IDBDatabase | undefined> {
+  return new Promise((resolve) => {
+    const request = indexedDB.open('boltHistory', 1);
+
+    request.onupgradeneeded = (event: IDBVersionChangeEvent) => {
+      const db = (event.target as IDBOpenDBRequest).result;
+
+      if (!db.objectStoreNames.contains('chats')) {
+        const store = db.createObjectStore('chats', { keyPath: 'id' });
+        store.createIndex('id', 'id', { unique: true });
+      }
+    };
+
+    request.onsuccess = (event: Event) => {
+      resolve((event.target as IDBOpenDBRequest).result);
+    };
+
+    request.onerror = (event: Event) => {
+      resolve(undefined);
+      logger.error((event.target as IDBOpenDBRequest).error);
+    };
+  });
+}
+
+export async function setMessages(db: IDBDatabase, id: string, messages: Message[]): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const transaction = db.transaction('chats', 'readwrite');
+    const store = transaction.objectStore('chats');
+
+    const request = store.put({
+      id,
+      messages,
+    });
+
+    request.onsuccess = () => resolve();
+    request.onerror = () => reject(request.error);
+  });
+}
+
+export async function getMessages(db: IDBDatabase, id: string): Promise<ChatHistory> {
+  return new Promise((resolve, reject) => {
+    const transaction = db.transaction('chats', 'readonly');
+    const store = transaction.objectStore('chats');
+    const request = store.get(id);
+
+    request.onsuccess = () => resolve(request.result as ChatHistory);
+    request.onerror = () => reject(request.error);
+  });
+}
+
+export async function getNextID(db: IDBDatabase): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const transaction = db.transaction('chats', 'readonly');
+    const store = transaction.objectStore('chats');
+    const request = store.count();
+
+    request.onsuccess = () => resolve(String(request.result));
+    request.onerror = () => reject(request.error);
+  });
+}