From 9516b60d93e45b4985b79229de186f8324374f3d Mon Sep 17 00:00:00 2001
From: Stephan <57194608+stephan418@users.noreply.github.com>
Date: Wed, 27 Apr 2022 17:00:36 +0200
Subject: [PATCH] Add logger using winston

+ Add formats
+ Add debug and error log files
---
 src/Middleware/error/handler.ts |  3 +++
 src/Middleware/error/logger.ts  | 39 +++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 src/Middleware/error/logger.ts

diff --git a/src/Middleware/error/handler.ts b/src/Middleware/error/handler.ts
index d182f19..33f3448 100644
--- a/src/Middleware/error/handler.ts
+++ b/src/Middleware/error/handler.ts
@@ -1,6 +1,7 @@
 import { PrismaClientUnknownRequestError } from "@prisma/client/runtime";
 import { NextFunction, Request, Response } from "express";
 import ForwardableError from "./ForwardableError";
+import logger from "./logger";
 
 const env = process.env.NODE_ENV || "production";
 
@@ -20,6 +21,8 @@ export default function defaultErrorHandler(err: any, req: Request, res: Respons
   }
 
   if (err instanceof PrismaClientUnknownRequestError) {
+    logger.warning(err);
+
     return res.status(404).json({
       type: "error",
       payload: {
diff --git a/src/Middleware/error/logger.ts b/src/Middleware/error/logger.ts
new file mode 100644
index 0000000..184f5f7
--- /dev/null
+++ b/src/Middleware/error/logger.ts
@@ -0,0 +1,39 @@
+import winston, { createLogger } from "winston";
+
+const {
+  format: { printf, colorize, combine, timestamp, json, errors, prettyPrint },
+} = winston;
+
+const defaultJsonFormat = combine(errors({ stack: true }), timestamp(), json({ space: 2 }));
+
+const customCLIFormat = printf(({ level, message, label, timestamp, stack }) => {
+  let output = `${level}${stack ? `(1/2:message)` : ""} at ${timestamp}${label ? ` (#${label})` : ""}: ${message}\n`;
+
+  if (stack) {
+    output += `\n${level}(2/2:stack)${label ? ` (#${label})` : ""}: ${stack}\n\n`;
+  }
+
+  return output;
+});
+
+export default createLogger({
+  levels: winston.config.syslog.levels,
+  format: combine(errors({ stack: true }), timestamp()),
+  transports: [
+    new winston.transports.Console({
+      level: "debug",
+      format: combine(timestamp(), colorize(), customCLIFormat),
+    }),
+    new winston.transports.File({
+      filename: "/app/error.log",
+      level: "error",
+      format: defaultJsonFormat,
+    }),
+    new winston.transports.File({
+      level: "debug",
+      filename: "/app/debug.log",
+      format: defaultJsonFormat,
+      silent: !(process.env.NODE_ENV === "development"), // Silent when not in development
+    }),
+  ],
+});