Add Tickets domain for the voucher-based ticket shop (#8)

Reviewed-on: #8
Co-authored-by: Patrick Mueller <patrick@mueller-patrick.tech>
Co-committed-by: Patrick Mueller <patrick@mueller-patrick.tech>

src/models/tickets/tickets.errors.ts

@@ -0,0 +1,18 @@
+import {Response} from 'express';
+import {Guid} from 'guid-typescript';
+import logger from '../../middleware/logger';
+
+/**
+ * The tickets module's standard catch-block response: log with a reference
+ * guid, never leak the real error message to the client. Mirrors the
+ * Feedback module's feedback.errors.ts convention.
+ */
+export const sendServerError = (res: Response, e: any): void => {
+	const 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
+	});
+};