Fix error handling to display them correctly without crashing

backend/src/main.ts

@@ -4,6 +4,6 @@ import { AppModule } from './app.module';
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
   app.enableCors();
-  await app.listen(3000);
+  await app.listen(3500);
 }
 bootstrap();

backend/src/models/RequestError.ts

@@ -0,0 +1,12 @@
+// @ts-ignore
+interface RequestError extends Error {
+  response?: any;
+}
+
+interface RequestErrorConstructor extends ErrorConstructor {
+  new(message?: string): RequestError;
+  (message?: string): RequestError;
+  readonly prototype: RequestError;
+}
+
+declare var RequestError: RequestErrorConstructor;

backend/src/services/sinusbot.service.ts

@@ -31,7 +31,7 @@ export class SinusBotService {
         .then(token => this.bearer = token)
         .catch(error => {
           logger.error(`Oh oh! Something went wrong while fetching Bearer token.`, error);
-          throw this.createHttpException(HttpStatus.UNAUTHORIZED, error.message);
+          throw this.createHttpException(HttpStatus.UNAUTHORIZED, `Fetching Bearer token for Sinusbot failed.`);
         });
       logger.debug(
         `Seems like I have my Bearer token! 
@@ -46,7 +46,7 @@ export class SinusBotService {
       .then(data => this.consumeTunakillResponse(data))
       .catch(error => {
         logger.error(`I couldn't fetch user data.`, error);
-        throw this.createHttpException(error.statusCode, error.message);
+        throw this.createHttpException(HttpStatus.INTERNAL_SERVER_ERROR, error.message);
       });
   }
 
@@ -90,12 +90,12 @@ export class SinusBotService {
 
   private consumeTunakillResponse(data: any): TableEntry[] {
     if (!(data !== null || data[0] !== null || data[0].data !== null)) {
-      throw Error('Response from SinusBot does not have any data to parse.')
+      throw Error('Response from SinusBot does not have any data to parse.');
     }
 
     const response = data[0].data;
     if (!(response.length > 0)) {
-      throw Error('User list is empty.')
+      throw Error('Response from SinusBot does not have any data to parse.');
     }
 
     return response
@@ -134,7 +134,9 @@ export class SinusBotService {
 
   private checkStatus = response => {
     if (!response.ok) {
-      throw Error(response.statusText);
+      let err = new RequestError(response.errorText);
+      err.response = response;
+      throw err;
     }
     return response;
   }