refactor: change firebaseAccessTokenService to a factory function for improved instantiation

Author: mitchdowney

src/factories/firebaseAccessTokenService.ts

@@ -1,6 +1,6 @@
 import { FirebaseAccessTokenService } from 'podverse-external-services';
 import { config } from '../config';
 
-export const firebaseAccessTokenService = new FirebaseAccessTokenService({
+export const firebaseAccessTokenServiceFactory = () => new FirebaseAccessTokenService({
   keyFilePath: config.firebase.authJsonPath
 });

src/lib/rss/parser.ts

@@ -12,7 +12,7 @@ import { handleAllRemoteItemsFeedParsing } from '@parser/lib/rss/remoteItemParse
 import { FeedIsParsingError, FeedNoChangesSinceLastParsedError } from './errors';
 import { timerManager } from '@parser/factories/timerManager';
 import { loggerService } from '@parser/factories/loggerService';
-import { firebaseAccessTokenService } from '@parser/factories/firebaseAccessTokenService';
+import { firebaseAccessTokenServiceFactory } from '@parser/factories/firebaseAccessTokenService';
 import { NotificationsServiceFactory } from '@parser/factories/notificationsService';
 
 /*
@@ -82,6 +82,7 @@ export const parseRSSFeedAndSaveToDatabase = async (url: string, podcast_index_i
     }
 
     if (newItemIdentifiers.newItemGuids.length > 0 || newLiveItemIdentifiers.newItemGuids.length > 0) {
+      const firebaseAccessTokenService = firebaseAccessTokenServiceFactory();
       const googleAuthToken = await firebaseAccessTokenService.generateAccessToken();
       const notificationsService = NotificationsServiceFactory(googleAuthToken);
       const accountFCMDeviceService = new AccountFCMDeviceService();