add db migration

db/patch1.sql

@@ -0,0 +1,37 @@
+-- You should not modify if this have pushed to Github, unless it do serious wrong with the db.
+-- Change Monitor.created_date from "TIMESTAMP" to "DATETIME"
+-- SQL Generated by Intellij Idea
+PRAGMA foreign_keys=off;
+
+BEGIN TRANSACTION;
+
+create table monitor_dg_tmp
+(
+    id INTEGER not null
+        primary key autoincrement,
+    name VARCHAR(150),
+    active BOOLEAN default 1 not null,
+    user_id INTEGER
+        references user
+                   on update cascade on delete set null,
+    interval INTEGER default 20 not null,
+    url TEXT,
+    type VARCHAR(20),
+    weight INTEGER default 2000,
+    hostname VARCHAR(255),
+    port INTEGER,
+    created_date DATETIME,
+    keyword VARCHAR(255)
+);
+
+insert into monitor_dg_tmp(id, name, active, user_id, interval, url, type, weight, hostname, port, created_date, keyword) select id, name, active, user_id, interval, url, type, weight, hostname, port, created_date, keyword from monitor;
+
+drop table monitor;
+
+alter table monitor_dg_tmp rename to monitor;
+
+create index user_id on monitor (user_id);
+
+COMMIT;
+
+PRAGMA foreign_keys=on;

server/database.js

@@ -0,0 +1,119 @@
+const fs = require("fs");
+const {sleep} = require("./util");
+const {R} = require("redbean-node");
+const {setSetting, setting} = require("./util-server");
+
+
+class Database {
+
+    static templatePath = "./db/kuma.db"
+    static path =  './data/kuma.db';
+    static latestVersion = 1;
+    static noReject = true;
+
+    static async patch() {
+        let version = parseInt(await setting("database_version"));
+
+        if (! version) {
+            version = 0;
+        }
+
+        console.info("Your database version: " + version);
+        console.info("Latest database version: " + this.latestVersion);
+
+        if (version === this.latestVersion) {
+            console.info("Database no need to patch");
+        } else {
+            console.info("Database patch is needed")
+
+            console.info("Backup the db")
+            const backupPath = "./data/kuma.db.bak" + version;
+            fs.copyFileSync(Database.path, backupPath);
+
+            // Try catch anything here, if gone wrong, restore the backup
+            try {
+                for (let i = version + 1; i <= this.latestVersion; i++) {
+                    const sqlFile = `./db/patch${i}.sql`;
+                    console.info(`Patching ${sqlFile}`);
+                    await Database.importSQLFile(sqlFile);
+                    console.info(`Patched ${sqlFile}`);
+                    await setSetting("database_version", i);
+                }
+                console.log("Database Patched Successfully");
+            } catch (ex) {
+                await Database.close();
+                console.error("Patch db failed!!! Restoring the backup")
+                fs.copyFileSync(backupPath, Database.path);
+                console.error(ex)
+
+                console.error("Start Uptime-Kuma failed due to patch db failed")
+                console.error("Please submit the bug report if you still encounter the problem after restart: https://github.com/louislam/uptime-kuma/issues")
+                process.exit(1);
+            }
+        }
+    }
+
+    /**
+     * Sadly, multi sql statements is not supported by many sqlite libraries, I have to implement it myself
+     * @param filename
+     * @returns {Promise<void>}
+     */
+    static async importSQLFile(filename) {
+
+        await R.getCell("SELECT 1");
+
+        let text = fs.readFileSync(filename).toString();
+
+        // Remove all comments (--)
+        let lines = text.split("\n");
+        lines = lines.filter((line) => {
+            return ! line.startsWith("--")
+        });
+
+        // Split statements by semicolon
+        // Filter out empty line
+        text = lines.join("\n")
+
+        let statements = text.split(";")
+            .map((statement) => {
+                return statement.trim();
+            })
+            .filter((statement) => {
+                return statement !== "";
+            })
+
+        for (let statement of statements) {
+            await R.exec(statement);
+        }
+    }
+
+    /**
+     * Special handle, because tarn.js throw a promise reject that cannot be caught
+     * @returns {Promise<void>}
+     */
+    static async close() {
+        const listener = (reason, p) => {
+            Database.noReject = false;
+        };
+        process.addListener('unhandledRejection', listener);
+
+        console.log("Closing DB")
+
+        while (true) {
+            Database.noReject = true;
+            await R.close()
+            await sleep(2000)
+
+            if (Database.noReject) {
+                break;
+            } else {
+                console.log("Waiting to close the db")
+            }
+        }
+        console.log("SQLite closed")
+
+        process.removeListener('unhandledRejection', listener);
+    }
+}
+
+module.exports = Database;

server/server.js

@@ -12,6 +12,7 @@ const fs = require("fs");
 const {getSettings} = require("./util-server");
 const {Notification} = require("./notification")
 const gracefulShutdown = require('http-graceful-shutdown');
+const Database = require("./database");
 const {sleep} = require("./util");
 const args = require('args-parser')(process.argv);
 
@@ -27,9 +28,28 @@ const server = http.createServer(app);
 const io = new Server(server);
 app.use(express.json())
 
+/**
+ * Total WebSocket client connected to server currently, no actual use
+ * @type {number}
+ */
 let totalClient = 0;
+
+/**
+ * Use for decode the auth object
+ * @type {null}
+ */
 let jwtSecret = null;
+
+/**
+ * Main monitor list
+ * @type {{}}
+ */
 let monitorList = {};
+
+/**
+ * Show Setup Page
+ * @type {boolean}
+ */
 let needSetup = false;
 
 (async () => {
@@ -555,19 +575,21 @@ function checkLogin(socket) {
 }
 
 async function initDatabase() {
-    const path = './data/kuma.db';
-
-    if (! fs.existsSync(path)) {
+    if (! fs.existsSync(Database.path)) {
         console.log("Copying Database")
-        fs.copyFileSync("./db/kuma.db", path);
+        fs.copyFileSync(Database.templatePath, Database.path);
     }
 
     console.log("Connecting to Database")
     R.setup('sqlite', {
-        filename: path
+        filename: Database.path
     });
     console.log("Connected")
 
+    // Patch the database
+    await Database.patch()
+
+    // Auto map the model to a bean object
     R.freeze(true)
     await R.autoloadModels("./server/model");
 
@@ -587,6 +609,7 @@ async function initDatabase() {
         console.log("Load JWT secret from database.")
     }
 
+    // If there is no record in user table, it is a new Uptime Kuma instance, need to setup
     if ((await R.count("user")) === 0) {
         console.log("No user, need setup")
         needSetup = true;
@@ -705,11 +728,6 @@ const startGracefulShutdown = async () => {
 
 }
 
-let noReject = true;
-process.on('unhandledRejection', (reason, p) => {
-    noReject = false;
-});
-
 async function shutdownFunction(signal) {
     console.log('Called signal: ' + signal);
 
@@ -718,24 +736,8 @@ async function shutdownFunction(signal) {
         let monitor = monitorList[id]
         monitor.stop()
     }
-    await sleep(2000)
-
-    console.log("Closing DB")
-
-    // Special handle, because tarn.js throw a promise reject that cannot be caught
-    while (true) {
-        noReject = true;
-        await R.close()
-        await sleep(2000)
-
-        if (noReject) {
-            break;
-        } else {
-            console.log("Waiting...")
-        }
-    }
-
-    console.log("OK")
+    await sleep(2000);
+    await Database.close();
 }
 
 function finalFunction() {

server/util-server.js

@@ -45,6 +45,18 @@ exports.setting = async function (key) {
     ])
 }
 
+exports.setSetting = async function (key, value) {
+    let bean = await R.findOne("setting", " `key` = ? ", [
+        key
+    ])
+    if (! bean) {
+        bean = R.dispense("setting")
+        bean.key = key;
+    }
+    bean.value = value;
+    await R.store(bean)
+}
+
 exports.getSettings = async function (type) {
     let list = await R.getAll("SELECT * FROM setting WHERE `type` = ? ", [
         type