refactor: improve readability and maintainability

app.js

@@ -5,37 +5,36 @@ import webRoutes from "./routes/ui.routes.js";
 import sqlite3 from "./plugins/db/db.js";
 import serverkey from "./plugins/key/server.key.js";
 import adminkey from "./plugins/key/admin.key.js";
-
 import pkg from "./package.json" assert { type: "json" };
-const appVersion = pkg.version;
 
-const buildApp = async function (serverOptions) {
-  const app = await Fastify(serverOptions);
+const appVersion = pkg.version;
 
-  //register the sqlite database plugin
-  await app.register(sqlite3);
-  //register the server key plugin
-  await app.register(serverkey);
-  //register the admin key plugin
-  await app.register(adminkey);
+const buildApp = async (serverOptions) => {
+  const app = Fastify(serverOptions);
 
-  //register the admin api routes
-  await app.register(adminRoutes, { prefix: "/v1/admin" });
-  //register the authentication api routes
-  await app.register(authRoutes, { prefix: "/v1/auth" });
-  //register the frontend routes used for the UI. This is optional
-  await app.register(webRoutes, { prefix: "/v1/web" });
+  try {
+    // Register the defaul authc plugins and routes
+    await app
+      .register(sqlite3)
+      .register(serverkey)
+      .register(adminkey)
+      .register(adminRoutes, { prefix: "/v1/admin" })
+      .register(authRoutes, { prefix: "/v1/auth" })
+      .register(webRoutes, { prefix: "/v1/web" })
+      .register(async (fastify, opts) => {
+        fastify.get("/", async (req, reply) => {
+          return `Welcome and hello 👋 - AuthCompanion is serving requests!      
+          Version: ${appVersion}`;
+        });
+      });
 
-  //register a default route welcoming the user
-  await app.register(async function defaultRoute(fastify, opts) {
-    fastify.get("/", async (req, reply) => {
-      return `Welcome and hello 👋 - AuthCompanion is serving requests!      
-      Version: ${appVersion}
-      `;
-    });
-  });
+    await app.ready();
 
-  return app;
+    return app;
+  } catch (err) {
+    console.log("Error building the app:", err);
+    throw err; // Rethrow the error to indicate app initialization failure
+  }
 };
 
 export default buildApp;

server.js

@@ -1,54 +1,54 @@
 import buildApp from "./app.js";
 import config from "./config.js";
 
-const server = await buildApp({
-  logger: true,
-  forceCloseConnections: true,
-});
-
-/**
- * Let's run the AuthCompanion server!
- */
-function startServer() {
-  server.listen(
-    {
+async function startServer() {
+  try {
+    const server = await buildApp({
+      logger: true,
+      forceCloseConnections: true,
+    });
+
+    await server.listen({
       port: config.AUTHPORT,
       host: "0.0.0.0",
-    },
-    (err) => {
-      if (err) {
-        console.log("Error starting server:", err);
-        process.exit(1);
-      }
-    }
-  );
+    });
+
+    printStartupMessage(config.AUTHPORT);
+    setupGracefulShutdown(server);
+  } catch (error) {
+    console.error("Error starting server:", error);
+    process.exit(1);
+  }
+}
+
+function printStartupMessage(port) {
   console.log(`
       ###########################################################
                 The AuthCompanion Server has started
 
-           🖥️   Client UI on: http://localhost:${config.AUTHPORT}/v1/web/login
-           🚀   Admin UI on: http://localhost:${config.AUTHPORT}/v1/admin/login
+           🖥️   Client UI on: http://localhost:${port}/v1/web/login
+           🚀   Admin UI on: http://localhost:${port}/v1/admin/login
 
       ###########################################################
       `);
-  console.log("Use CTRL-C to shutdown AuthCompanion");
+  console.log("Use CTRL-C to shut down AuthCompanion");
 }
 
-//setup for gracefully exiting the AuthCompanion server
-async function handleSignal() {
-  try {
-    await server.close();
-    console.log(`
-  AuthCompanion has exited, Good bye👋`);
-    process.exit(0);
-  } catch (error) {
-    console.log("Error shutting down server:", error);
-    process.exit(1);
-  }
-}
+function setupGracefulShutdown(server) {
+  const handleSignal = async () => {
+    try {
+      await server.close();
+      console.log("AuthCompanion has exited. Goodbye! 👋");
+      process.exit(0);
+    } catch (error) {
+      console.error("Error shutting down server:", error);
+      process.exit(1);
+    }
+  };
 
-process.on("SIGTERM", handleSignal);
-process.on("SIGINT", handleSignal);
-process.on("SIGUSR2", handleSignal);
+  process.on("SIGTERM", handleSignal);
+  process.on("SIGINT", handleSignal);
+  process.on("SIGUSR2", handleSignal);
+}
 
 startServer();