API-15: Error reference codes (#14)

Co-authored-by: Patrick Müller <patrick@mueller-patrick.tech>
Reviewed-on: #14
Co-authored-by: Patrick Müller <patrick@plutodev.de>
Co-committed-by: Patrick Müller <patrick@plutodev.de>

src/models/partyplaner/friendship/Friendship.router.ts

@@ -5,6 +5,7 @@ import express, {Request, Response} from 'express';
 import * as FriendshipService from './friendship.service';
 import * as UserService from '../user/user.service';
 import logger from '../../../middleware/logger';
+import {Guid} from 'guid-typescript';
 
 /**
  * Router Definition
@@ -38,7 +39,12 @@ friendshipRouter.get('/:isDevCall', async (req: Request, res: Response) => {
 
         res.status(200).send(data);
     } catch (e) {
-        logger.error('Error handling a request: ' + e.message);
-        res.status(500).send({'message': 'Internal Server Error. Try again later.'});
+        let errorGuid = Guid.create().toString();
+        logger.error('Error handling a request: ' + e.message, {reference: errorGuid});
+        res.status(500).send({
+            'status': 'PROCESSING_ERROR',
+            'message': 'Internal Server Error. Try again later.',
+            'reference': errorGuid
+        });
     }
 });