Fix shutdown issue and tidy up

server/util-server.js

@@ -29,9 +29,6 @@ const {
     },
 } = require("node-radius-utils");
 const dayjs = require("dayjs");
-const readline = require("readline");
-const rl = readline.createInterface({ input: process.stdin,
-    output: process.stdout });
 
 // SASLOptions used in JSDoc
 // eslint-disable-next-line no-unused-vars
@@ -1079,7 +1076,15 @@ module.exports.shake256 = (data, len) => {
         .digest("hex");
 };
 
-module.exports.prompt = (query) => new Promise((resolve) => rl.question(query, resolve));
+/**
+ * Non await sleep
+ * Source: https://stackoverflow.com/questions/59099454/is-there-a-way-to-call-sleep-without-await-keyword
+ * @param {number} n Milliseconds to wait
+ * @returns {void}
+ */
+module.exports.wait = (n) => {
+    Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, n);
+};
 
 // For unit test, export functions
 if (process.env.TEST_BACKEND) {