feat: add health check server

package.json

@@ -12,7 +12,7 @@
   },
   "engines": {
     "node": "20",
-    "pnpm": "8"
+    "pnpm": "9"
   },
   "repository": {
     "type": "git",
@@ -43,6 +43,7 @@
     "@sentry/node": "7.114.0",
     "discord.js": "14.15.2",
     "dotenv": "16.4.5",
+    "fastify": "5.0.0",
     "winston": "3.13.0"
   }
 }

src/index.ts

@@ -3,6 +3,7 @@ import * as Sentry from "@sentry/node";
 import { Client, GatewayIntentBits, WebhookClient } from "discord.js";
 
 import { manageRoles } from "./modules/manageRoles";
+import { instantiateServer } from "./server/serve";
 import { errorHandler } from "./utils/errorHandler";
 
 Sentry.init({
@@ -43,6 +44,7 @@ Sentry.init({
     });
 
     await bot.login(process.env.DISCORD_TOKEN);
+    await instantiateServer(bot);
   } catch (err) {
     await errorHandler("index", err);
   }

src/server/serve.ts

@@ -0,0 +1,48 @@
+import { readFile } from "fs/promises";
+
+import { type Client, WebhookClient } from "discord.js";
+import fastify from "fastify";
+
+import { errorHandler } from "../utils/errorHandler";
+
+/**
+ * Starts up a web server for health monitoring.
+ *
+ * @param {Client} bot The bot's Discord instance.
+ */
+export const instantiateServer = async (bot: Client) => {
+  try {
+    const server = fastify({
+      logger: false,
+      https: {
+        cert: await readFile(
+          "/etc/letsencrypt/live/oogie.nhcarrigan.com-0001/cert.pem"
+        ),
+        key: await readFile(
+          "/etc/letsencrypt/live/oogie.nhcarrigan.com-0001/privkey.pem"
+        ),
+      },
+    });
+
+    server.get("/", (_req, res) => {
+      res.send("Health check~!");
+    });
+
+    server.listen({ port: 1443 }, (err) => {
+      if (err) {
+        void errorHandler("start server", err);
+        return;
+      }
+      const hook = new WebhookClient({ url: process.env.DEBUG_HOOK as string });
+      void hook.send({
+        avatarURL:
+          bot.user?.displayAvatarURL() ??
+          "https://cdn.nhcarrigan.com/profile.png",
+        content: "Fastify server live on port 1443~!",
+        username: bot.user?.username ?? "Hacktoberfest",
+      });
+    });
+  } catch (err) {
+    await errorHandler("instantiate server", err);
+  }
+};