Store settings in lowdb

backend/src/ConfigStorage.ts

@@ -0,0 +1,41 @@
+import * as FileAsync from 'lowdb/adapters/FileAsync'
+import * as lowdb from 'lowdb'
+import { backendEvents } from '../../events'
+import {
+  makeStorageResponseEvent,
+  storageClearEvent,
+  storageLoadEvent,
+  storageStoreEvent,
+  makeStorageAcknoledgementEvent,
+} from '../../events/StorageEvents'
+
+export default class ConfigStorage {
+  private adapter: any
+  constructor(file: string) {
+    this.adapter = new FileAsync(file)
+  }
+
+  public async init() {
+    const database: lowdb.LoDashExplicitAsyncWrapper<any> = await lowdb(this.adapter)
+    backendEvents.subscribe(storageStoreEvent, async (event) => {
+      await database.set(event.store, event.data).write()
+      backendEvents.emit(makeStorageAcknoledgementEvent(event.transactionId), undefined)
+    })
+
+    backendEvents.subscribe(storageLoadEvent, async (event) => {
+      const responseEvent = makeStorageResponseEvent(event.transactionId)
+      try {
+        const data = await database.get(event.store).value()
+        backendEvents.emit(responseEvent, { data, transactionId: event.transactionId })
+      } catch (error) {
+        console.error(error)
+        backendEvents.emit(responseEvent, { transactionId: event.transactionId })
+      }
+    })
+
+    backendEvents.subscribe(storageClearEvent, async (event) => {
+      await database.drop()
+      backendEvents.emit(makeStorageAcknoledgementEvent(event.transactionId), undefined)
+    })
+  }
+}