fix: use custom storage adapter

src/bot.ts

@@ -3,10 +3,12 @@ import { FileAdapter } from '@grammyjs/storage-file'
 import { ISession, MongoDBAdapter } from '@grammyjs/storage-mongodb'
 import { Bot, Context, session, SessionFlavor } from 'grammy'
 import { MongoClient } from 'mongodb'
+
 import * as commands from './commands'
 import { AppConfig } from './config'
 import * as conversations from './conversations'
 import * as handlers from './handlers'
+import { ISession, MongoDBAdapter } from './util/storage-adapter'
 
 export type AppSession = {
   pixKey: string

src/util/storage-adapter.ts

@@ -0,0 +1,45 @@
+import type { StorageAdapter } from 'grammy'
+import type { Collection } from 'mongodb'
+
+export interface ISession {
+  _id: { $oid: string }
+  key: string
+  value: unknown
+}
+
+export class MongoDBAdapter<T> implements StorageAdapter<T> {
+  private collection: Collection<ISession>
+
+  constructor({ collection }: { collection: Collection<ISession> }) {
+    this.collection = collection
+  }
+
+  async read(key: string) {
+    const session = await this.collection.findOne({ key })
+
+    if (session === null || session === undefined) {
+      return undefined
+    }
+
+    return session.value as T
+  }
+
+  async write(key: string, data: T) {
+    await this.collection.updateOne(
+      {
+        key
+      },
+      {
+        $set: {
+          key,
+          value: data
+        }
+      },
+      { upsert: true, ignoreUndefined: true }
+    )
+  }
+
+  async delete(key: string) {
+    await this.collection.deleteOne({ key })
+  }
+}