add util.ts for sharing common functions between frontend and backend

server/database.js

@@ -1,5 +1,5 @@
 const fs = require("fs");
-const {sleep} = require("./util");
+const {sleep} = require("../src/util");
 const {R} = require("redbean-node");
 const {setSetting, setting} = require("./util-server");
 

server/model/monitor.js

@@ -6,7 +6,7 @@ dayjs.extend(utc)
 dayjs.extend(timezone)
 const axios = require("axios");
 const {Prometheus} = require("../prometheus");
-const {debug, UP, DOWN, PENDING} = require("../util");
+const {debug, UP, DOWN, PENDING} = require("../../src/util");
 const {tcping, ping, checkCertificate} = require("../util-server");
 const {R} = require("redbean-node");
 const {BeanModel} = require("redbean-node/dist/bean-model");
@@ -221,9 +221,12 @@ class Monitor extends BeanModel {
         clearInterval(this.heartbeatInterval)
     }
 
-    // Helper Method:
-    // returns URL object for further usage
-    // returns null if url is invalid
+    /**
+     * Helper Method:
+     * returns URL object for further usage
+     * returns null if url is invalid
+     * @returns {null|URL}
+     */
     getUrl() {
         try {
             return new URL(this.url);
@@ -232,7 +235,11 @@ class Monitor extends BeanModel {
         }
     }
 
-    // Store TLS info to database
+    /**
+     * Store TLS info to database
+     * @param checkCertificateResult
+     * @returns {Promise<void>}
+     */
     async updateTlsInfo(checkCertificateResult) {
         let tls_info_bean = await R.findOne("monitor_tls_info", "monitor_id = ?", [
             this.id

server/server.js

@@ -12,7 +12,7 @@ const { getSettings } = require("./util-server");
 const { Notification } = require("./notification")
 const gracefulShutdown = require("http-graceful-shutdown");
 const Database = require("./database");
-const { sleep } = require("./util");
+const { sleep } = require("../src/util");
 const args = require("args-parser")(process.argv);
 const prometheusAPIMetrics = require("prometheus-api-metrics");
 const { basicAuth } = require("./auth");

server/util.js

@@ -1,25 +0,0 @@
-// Common JS cannot be used in frontend sadly
-// sleep, ucfirst is duplicated in ../src/util-frontend.js
-
-exports.DOWN = 0;
-exports.UP = 1;
-exports.PENDING = 2;
-
-exports.sleep = function (ms) {
-    return new Promise(resolve => setTimeout(resolve, ms));
-}
-
-exports.ucfirst = function (str) {
-    if (! str) {
-        return str;
-    }
-
-    const firstLetter = str.substr(0, 1);
-    return firstLetter.toUpperCase() + str.substr(1);
-}
-
-exports.debug = (msg) => {
-    if (process.env.NODE_ENV === "development") {
-        console.log(msg)
-    }
-}