From 6fe398c82a60937d15ff9fc44c0f0d525b4ccedb Mon Sep 17 00:00:00 2001
From: hippoz <10706925-hippoz@users.noreply.gitlab.com>
Date: Fri, 5 Aug 2022 04:32:10 +0300
Subject: [PATCH] add custon express error handler

---
 src/errors.ts |  3 ++-
 src/server.ts | 10 +++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/errors.ts b/src/errors.ts
index f660013..1d236c6 100644
--- a/src/errors.ts
+++ b/src/errors.ts
@@ -6,7 +6,8 @@ export const errors = {
     FORBIDDEN_DUE_TO_MISSING_PERMISSIONS: { code: 6005, message: "Forbidden due to missing permission(s)" },
     BAD_SUPERUSER_KEY: { code: 6006, message: "Bad superuser key" },
     GOT_NO_DATABASE_DATA: { code: 7001, message: "Unexpectedly got no data from database" },
-    FEATURE_DISABLED: { code: 7002, message: "This feature is disabled" }
+    FEATURE_DISABLED: { code: 7002, message: "This feature is disabled" },
+    INTERNAL_ERROR: { code: 7003, message: "Internal server error" }
 };
 
 export const gatewayErrors = {
diff --git a/src/server.ts b/src/server.ts
index 210f5f0..84a483a 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -1,7 +1,8 @@
-import express, { Application, json } from "express";
+import express, { Application, ErrorRequestHandler, json } from "express";
 import usersRouter from "./routes/api/v1/users";
 import channelsRouter from "./routes/api/v1/channels";
 import messagesRouter from "./routes/api/v1/messages";
+import { errors } from "./errors";
 
 export default function(app: Application) {
     app.use(json());
@@ -9,4 +10,11 @@ export default function(app: Application) {
     app.use("/api/v1/channels", channelsRouter);
     app.use("/api/v1/messages", messagesRouter);
     app.use("/", express.static("frontend/public"));
+
+    const errorHandler: ErrorRequestHandler = (error, req, res, next) => {
+        console.error("error: while handling request", error);
+        res.status(500).json({ ...errors.INTERNAL_ERROR });
+    };
+
+    app.use(errorHandler);
 };