From 61a62527f3db2c1b84c6bc9e753963b3845c7b31 Mon Sep 17 00:00:00 2001
From: Ruslan Kabalin <ruslan.kabalin@gmail.com>
Date: Mon, 4 Dec 2023 22:10:48 +0000
Subject: [PATCH] Add healthcheck for each express instance.

Instance accepts /health query on listening port.
---
 controllers/routes.js | 5 +++--
 downloader.js         | 8 ++++++++
 uploader.js           | 8 ++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/controllers/routes.js b/controllers/routes.js
index 83cb36046..ec6286a77 100644
--- a/controllers/routes.js
+++ b/controllers/routes.js
@@ -321,8 +321,9 @@ export function bindRoutes(app) {
     });
 
     // Ping-pong to verify the server is working
-    app.all('/ping', (req, res) => {
-        res.status(200).send('pong');
+    app.all('/health', (req, res) => {
+        res.set('Cache-Control', 'no-store');
+        res.status(200).send('OK');
     });
 
     // Last handler. If request reaches it, means that there is no handler for this request
diff --git a/downloader.js b/downloader.js
index 3cbee5034..e357b7149 100644
--- a/downloader.js
+++ b/downloader.js
@@ -302,6 +302,14 @@ export async function configure(startStamp) {
     // Start server and do manual manual url router, express is not needed
     const server = http
         .createServer(function handleRequest(req, res) {
+            if (req.url === '/health') {
+                res.setHeader('Cache-Control', 'no-store');
+                res.statusCode = 200;
+                res.end('OK');
+
+                return;
+            }
+
             if (protectedServePattern.test(req.url)) {
                 return protectedHandler(req, res);
             }
diff --git a/uploader.js b/uploader.js
index 6dc0a1faa..3df8c404b 100644
--- a/uploader.js
+++ b/uploader.js
@@ -268,6 +268,14 @@ export function configure(startStamp) {
     };
 
     const handleRequest = (req, res) => {
+        if (req.url === '/health') {
+            res.setHeader('Cache-Control', 'no-store');
+            res.statusCode = 200;
+            res.end('OK');
+
+            return;
+        }
+
         if (req.url !== '/upload' && req.url !== '/uploadava') {
             res.statusCode = 403;
             res.end();