progress

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "editor.tabSize": 2
+}

README.md

@@ -1,47 +1 @@
-```
+# Modbus Logger App
-modbus-logger-app
-├─ .gitignore
-├─ .prettierrc
-├─ app
-│  └─ index.js
-├─ config
-│  ├─ database.config.js
-│  ├─ env.config.js
-│  └─ modbus-client.config.js
-├─ data.db
-├─ index.d.ts
-├─ jsconfig.json
-├─ middlewares
-│  ├─ index.js
-│  └─ validate-body.middleware.js
-├─ nodemon.json
-├─ package-lock.json
-├─ package.json
-├─ public
-│  ├─ css
-│  │  ├─ dist.css
-│  │  ├─ dygraphs.css
-│  │  └─ main.css
-│  ├─ index.html
-│  └─ js
-│     ├─ alpine.js
-│     ├─ app.js
-│     └─ dygraphs.min.js
-├─ routes
-│  ├─ api.router.js
-│  └─ index.js
-├─ scripts
-│  └─ db-init.script.js
-├─ server.js
-├─ services
-│  ├─ app.service.js
-│  └─ index.js
-├─ sql
-│  └─ init-schema.sql
-├─ tailwind.config.js
-├─ utils
-│  └─ database.util.js
-└─ validators
-   └─ index.js
-
-```

controllers/app.controller.js

@@ -0,0 +1,102 @@
+import db from "#root/config/database.config.js";
+
+/**
+ * Services
+ */
+ import { appService } from "#root/services/index.js";
+
+export const appController = {
+    /**
+     * Get application config from database
+     * @param {import('express').Request} req 
+     * @param {import('express').Response} res 
+     * @param {import('express').NextFunction} next 
+     */
+    async getConfig(req, res, next) {
+        try {
+            const data = await appService.getConfig(db);
+            if (!data) return res.status(200).json({ config: null });
+            return res.status(200).json({ config: data });
+        } catch (error) {
+            next(error);
+        }
+    },
+
+    /**
+     * Update application config
+     * @param {import('express').Request} req 
+     * @param {import('express').Response} res 
+     * @param {import('express').NextFunction} next 
+     */
+    async updateConfig(req, res, next) {
+        try {
+            const config = await appService.getConfig(db);
+            const payload = req.body;
+        
+            if (!config) await db.run(`INSERT INTO "app_config" (id) VALUES (?)`, [0]);
+        
+            /* Update TCP configuration */
+            if (payload.mb_connection_type === "TCP") {
+            const { mb_tcp_ip, mb_tcp_port } = payload;
+            await db.run(
+                `
+                UPDATE "app_config" SET id = 0, mb_connection_type = "TCP", mb_tcp_ip = ?, mb_tcp_port = ?, log_interval_ms = ?
+                `,
+                [mb_tcp_ip, mb_tcp_port, payload.log_interval_ms],
+            );
+        
+            return res.status(200).json({ message: "Config Updated." });
+            }
+        
+            /* Update RTU configuration */
+            if (payload.mb_connection_type === "RTU") {
+            const { mb_rtu_path, mb_rtu_baud, mb_rtu_parity, mb_rtu_data_bits, mb_rtu_stop_bits } = payload;
+            await db.run(
+                `
+                UPDATE "app_config" SET id = 0, 
+                                        mb_connection_type = "RTU", 
+                                        mb_rtu_path = ?, 
+                                        mb_rtu_baud = ?, 
+                                        mb_rtu_parity = ?, 
+                                        mb_rtu_data_bits = ?, 
+                                        mb_rtu_stop_bits = ?,
+                                        log_interval_ms = ?
+                `,
+                [mb_rtu_path, mb_rtu_baud, mb_rtu_parity, mb_rtu_data_bits, mb_rtu_stop_bits, payload.log_interval_ms],
+            );
+            return res.status(200).json({ message: "Config updated." });
+            }
+        
+            return res.status(400).json({ message: "Undefined Modbus connection type." });
+        } catch (error) {
+            next(error);
+        }
+    },
+
+    /**
+     * Check whether the application is configured or not
+     * @param {import('express').Request} req 
+     * @param {import('express').Response} res 
+     * @param {import('express').NextFunction} next 
+     */
+    async isConfigured(req, res, next) {
+        try {
+            const config = await appService.getConfig(db);
+            if (!config) return res.status(200).json({ is_configured: false });
+
+            for (const colPrefix of ['mb_tcp', 'mb_rtu']) {
+                if (config.mb_connection_type.toLocaleLowerCase() !== colPrefix.substring(3))
+                    continue;
+                const keys = Object.keys(config).filter((k) => k.includes(colPrefix));
+                for (const k of keys) {
+                    if (!config[k])
+                        return res.status(200).json({ is_configured: false });
+                }
+            }
+        
+            return res.status(200).json({ is_configured: true });
+        } catch (error) {
+            next(error);
+        }
+    }
+}

controllers/index.js

@@ -0,0 +1,2 @@
+export * from './app.controller.js'
+export * from './modbus.controller.js'

controllers/modbus.controller.js

@@ -0,0 +1,139 @@
+import db from "#root/config/database.config.js";
+import modbusClient from "#root/config/modbus-client.config.js";
+import { appService } from "#root/services/index.js";
+
+export const modbusController = {
+   /**
+    * Connect to modbus network using configuration from database
+    * @param {import('express').Request} req 
+    * @param {import('express').Response} res 
+    * @param {import('express').NextFunction} next 
+    */
+  async connect(req, res, next) {
+    try {
+      const config = await appService.getConfig(db);
+      if (!config) return res.status(400).json({ message: "Application is not configured" });
+  
+      if (modbusClient.isOpen) {
+        modbusClient.close(undefined);
+        modbusClient.destroy(undefined);
+      }
+  
+      if (config.mb_connection_type === "TCP") {
+        await modbusClient.connectTCP(config.mb_tcp_ip, { port: config.mb_tcp_port });
+        return res.status(200).json({ message: "Connected." });
+      }
+  
+      if (config.mb_connection_type === "RTU") {
+        await modbusClient.connectRTU(config.mb_rtu_path, {
+          baudRate: config.mb_rtu_baud,
+          dataBits: config.mb_rtu_data_bits,
+          parity: config.mb_rtu_parity,
+          stopBits: config.mb_rtu_stop_bits,
+        });
+        return res.status(200).json({ message: "Connected." });
+      }
+  
+      return res.status(400).json({ message: "Connection type is invalid." });
+    } catch (error) {
+      next(error);
+    }
+  },
+
+  /**
+   * Close the modbus connection
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async close(req, res, next) {
+    try {
+      if (!modbusClient.isOpen) return res.status(400).json({ message: "Already closed." });
+      modbusClient.close(undefined);
+      modbusClient.destroy(undefined);
+    } catch (error) {
+      next(error);
+    }
+  },
+
+  /**
+   * Get list of modbus slave devices
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async list(req, res, next) {
+    try {
+      const slaves = await db.all('SELECT * from modbus_slaves');
+      return res.status(200).json(slaves);
+    } catch (error) {
+      next(error)
+    }
+  },
+
+  /**
+   * Create new modbus slave device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async createSlaveDevice(req, res, next) {},
+
+  /**
+   * Remove modbus slave device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async removeSlaveDevice(req, res, next) {},
+
+  /**
+   * Create display value for modbus slave device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async createDisplayValue(req, res, next) {},
+
+  /**
+   * Remove display value from modbus slave device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async removeDisplayValue(req, res, next) {},
+
+  /**
+   * Get latest data log from modbus slave device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async getLatestLog(req, res, next) {},
+
+  /**
+   * Create event stream for sending data from modbus device
+   * @param {import('express').Request} req 
+   * @param {import('express').Response} res 
+   * @param {import('express').NextFunction} next 
+   */
+  async streamData(req, res, next) {
+    try {
+      if (!modbusClient.isOpen) return res.status(503).json({ message: "Modbus connection closed." });
+  
+      res.setHeader("Cache-Control", "no-cache");
+      res.setHeader("Content-Type", "text/event-stream");
+      res.setHeader("Connection", "keep-alive");
+  
+      let interval = setInterval(async () => {
+        const { data } = await modbusClient.readHoldingRegisters(0, 1);
+        res.write("event: messsage\n");
+        res.write(`data: ${JSON.stringify({ data })}`);
+        res.write("\n\n");
+      }, 1000);
+      req.on("close", () => clearInterval(interval));
+    } catch (error) {
+      next(error);
+    }
+  }
+}

index.d.ts

@@ -9,3 +9,10 @@ export type AppConfig = {
   mb_rtu_stop_bits: number | null;
   log_interval_ms: number;
 };
+
+export type ModbusSlave = {
+  id: number;
+  name: string;
+  display_addr: number;
+  is_logging: boolean;
+}

middlewares/validate-body.middleware.js

@@ -13,7 +13,9 @@ export function validateBodyMiddleware(schema) {
       await schema.validate(req.body);
       next();
     } catch (error) {
-      return res.status(400).send(error.message);
+      return res.status(400).json({ error: {
+        message: error.errors[0]
+      }});
     }
   };
 }

migrations/001-init.sql

@@ -0,0 +1,45 @@
+--------------------------------------------------------------------------------
+-- Up
+--------------------------------------------------------------------------------
+
+CREATE TABLE IF NOT EXISTS "app_config" (
+	"id"	INTEGER,
+	"mb_connection_type"	VARCHAR(3) NOT NULL DEFAULT "RTU" CHECK(mb_connection_type IN ('TCP','RTU')),
+	"mb_tcp_ip"	VARCHAR(15) NOT NULL DEFAULT "127.0.0.1",
+	"mb_tcp_port"	INTEGER NOT NULL DEFAULT 502,
+	"mb_rtu_path"	VARCHAR(10) NOT NULL DEFAULT "",
+	"mb_rtu_baud"	INTEGER NOT NULL DEFAULT 9600,
+	"mb_rtu_parity"	VARCHAR(5) NOT NULL DEFAULT "none" CHECK(mb_rtu_parity IN ("even", "odd", "none")),
+	"mb_rtu_data_bits"	INTEGER NOT NULL DEFAULT 8,
+	"mb_rtu_stop_bits"	INTEGER NOT NULL DEFAULT 1,
+	"log_interval_ms" INTEGER DEFAULT 1000 NOT NULL,
+	CONSTRAINT "id_unique" CHECK(id=0),
+	CONSTRAINT "min_interval_check" CHECK(log_interval_ms >= 1000)
+	PRIMARY KEY("id")
+);
+
+CREATE TABLE IF NOT EXISTS "modbus_slaves" (
+	"id" INTEGER CHECK (id >= 1 AND id <= 255),
+	"name" VARCHAR(256) NOT NULL,
+	"display_addr" INTEGER CHECK(display_addr >= 0 AND display_addr <= 65534),
+	-- "display_val_format" INTEGER CHECK IN(16, 32) NOT NULL,
+	"is_logging" BOOLEAN NOT NULL,
+	PRIMARY KEY("id")
+);
+
+CREATE TABLE IF NOT EXISTS "display_values" (
+	"id" INTEGER,
+	"name" VARCHAR(32),
+	"slave_id" INTEGER NOT NULL,
+	"reg_addr" INTEGER DEFAULT 0 NOT NULL CHECK(reg_addr >= 0 AND reg_addr <= 65534),
+	PRIMARY KEY("id"),
+	FOREIGN KEY("slave_id") REFERENCES modbus_slaves("id") ON DELETE CASCADE
+);
+
+--------------------------------------------------------------------------------
+-- Down
+--------------------------------------------------------------------------------
+
+DROP TABLE app_config;
+DROP TABLE modbus_slaves;
+DROP TABLE display_values;

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "node server.js",
     "dev": "nodemon server.js",
+    "tailwind-build": "tailwindcss -i ./public/css/main.css -o ./public/css/dist.css --watch",
     "db:init": "node ./scripts/db-init.script.js"
   },
   "keywords": [],

public/css/dist.css

@@ -616,6 +616,10 @@ video {
   margin-left: auto;
 }
 
+.mr-1 {
+  margin-right: 0.25rem;
+}
+
 .mr-2 {
   margin-right: 0.5rem;
 }
@@ -660,6 +664,10 @@ video {
   height: 5rem;
 }
 
+.h-screen {
+  height: 100vh;
+}
+
 .w-1 {
   width: 0.25rem;
 }
@@ -668,6 +676,34 @@ video {
   width: 5rem;
 }
 
+.w-48 {
+  width: 12rem;
+}
+
+.w-72 {
+  width: 18rem;
+}
+
+.w-full {
+  width: 100%;
+}
+
+.w-24 {
+  width: 6rem;
+}
+
+.w-16 {
+  width: 4rem;
+}
+
+.w-12 {
+  width: 3rem;
+}
+
+.w-64 {
+  width: 16rem;
+}
+
 .max-w-2xl {
   max-width: 42rem;
 }
@@ -676,6 +712,10 @@ video {
   max-width: 72rem;
 }
 
+.flex-auto {
+  flex: 1 1 auto;
+}
+
 .transform {
   transform: translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y));
 }
@@ -710,6 +750,12 @@ video {
   justify-content: space-between;
 }
 
+.space-x-2 > :not([hidden]) ~ :not([hidden]) {
+  --tw-space-x-reverse: 0;
+  margin-right: calc(0.5rem * var(--tw-space-x-reverse));
+  margin-left: calc(0.5rem * calc(1 - var(--tw-space-x-reverse)));
+}
+
 .space-y-3 > :not([hidden]) ~ :not([hidden]) {
   --tw-space-y-reverse: 0;
   margin-top: calc(0.75rem * calc(1 - var(--tw-space-y-reverse)));
@@ -724,6 +770,14 @@ video {
   border-width: 1px;
 }
 
+.border-l {
+  border-left-width: 1px;
+}
+
+.border-r {
+  border-right-width: 1px;
+}
+
 .fill-blue-600 {
   fill: #2563eb;
 }
@@ -752,6 +806,26 @@ video {
   padding: 20rem;
 }
 
+.px-2 {
+  padding-left: 0.5rem;
+  padding-right: 0.5rem;
+}
+
+.px-2\.5 {
+  padding-left: 0.625rem;
+  padding-right: 0.625rem;
+}
+
+.py-1 {
+  padding-top: 0.25rem;
+  padding-bottom: 0.25rem;
+}
+
+.py-1\.5 {
+  padding-top: 0.375rem;
+  padding-bottom: 0.375rem;
+}
+
 .py-8 {
   padding-top: 2rem;
   padding-bottom: 2rem;
@@ -761,10 +835,6 @@ video {
   text-align: center;
 }
 
-.align-middle {
-  vertical-align: middle;
-}
-
 .text-2xl {
   font-size: 1.5rem;
   line-height: 2rem;
@@ -775,6 +845,11 @@ video {
   line-height: 2.25rem;
 }
 
+.text-sm {
+  font-size: 0.875rem;
+  line-height: 1.25rem;
+}
+
 .font-bold {
   font-weight: 700;
 }

public/index.html

@@ -8,28 +8,42 @@
     <script defer type="module" src="/js/app.js"></script>
   </head>
   <body class="m-2">
+    <!-- <div class="border p-4" x-data>
+      <span>app state:</span>
+      <pre x-text="JSON.stringify($store.app, undefined, 2)"></pre>
+    </div> -->
+    
     <!-- Root element -->
     <div x-data x-cloak class="mx-auto max-w-6xl m-2 py-8">
       <!-- Monitoring content -->
       <main x-bind:hidden="$store.app.currentPage !== 'monitoring'">
-        <div>
+        <!-- <div>
           <h1 class="text-3xl font-bold">Monitoring page</h1>
-          <button @click="$store.app.currentPage = 'configuration'" class="btn">Config</button>
+          <button @click="$store.app.setPage('configuration')" class="btn">Config</button>
+        </div> -->
+        <div class="flex flex-auto flex-row h-screen space-x-2">
+          <div class="border-r w-64 p-4">
+            <div class="w-full border px-2.5 py-1.5 rounded-sm">
+              <h2 class="text-sm">Modbus slave #1</h2>
+            </div>
+          </div>
+          <div class="w-full">
+            graph...
+          </div>
+          <div class="border-l w-48 p-4">
+
+          </div>
         </div>
       </main>
 
       <!-- Configuration content -->
-      <main x-data="configApp" x-bind:hidden="$store.app.currentPage !== 'configuration'">
+      <main x-data="configAppPage" x-bind:hidden="$store.app.currentPage !== 'configuration'">
         <div class="border rounded-sm p-4 max-w-2xl mx-auto">
           <h2 class="text-2xl font-bold">Setup configuration</h2>
           <p class="text-gray-700 italic">
             Fill in the required configuration settings to connect to the Modbus network.
           </p>
           <hr />
-          <!-- <div>
-            <span>app config state:</span>
-            <pre x-text="JSON.stringify($store.app.config, undefined, 2)"></pre>
-          </div> -->
           <form @submit.prevent="configurateApp()" action="#">
             <div>
               <div>
@@ -96,7 +110,7 @@
                     <option value="57600">57600</option>
                     <option value="38400">38400</option>
                     <option value="19200">19200</option>
-                    <option selected value="9600">9600</option>
+                    <option value="9600">9600</option>
                     <option value="1200">1200</option>
                   </select>
                 </div>
@@ -123,7 +137,7 @@
                     x-model.number="$store.app.config.mb_rtu_data_bits"
                     x-bind:required="$store.app.config.mb_connection_type === 'RTU'"
                   >
-                    <option selected value="8">8</option>
+                    <option value="8">8</option>
                     <option value="7">7</option>
                     <option value="6">6</option>
                     <option value="5">5</option>
@@ -158,7 +172,7 @@
             </div>
 
             <div class="mt-3 flex flex-row justify-between items-center">
-              <div>
+              <div class="mr-1">
                 <button
                   x-bind:disabled="isLoading"
                   x-bind:class="isLoading && 'opacity-70'"
@@ -169,7 +183,7 @@
                 </button>
               </div>
               <div>
-                <span class="text-red-600" x-text="errorMessage">Error while connection to Modbus network</span>
+                <span class="text-red-600" x-text="errorMessage"></span>
               </div>
             </div>
           </form>
@@ -200,6 +214,26 @@
           <p class="mt-4">Loading...</p>
         </div>
       </main>
+
+      <!-- Error content -->
+      <main x-bind:hidden="$store.app.currentPage !== 'error'">
+        <div>
+          <h1 class="text-2xl font-bold">Something went wrong.</h1>
+          <p>Refresh page to try again.</p>
+          <br />
+          <div class="border p-4">
+            <pre x-text="JSON.stringify($store.app.error, undefined, 2)" x-show="$store.app.error">
+            </pre>
+          </div>
+        </div>
+      </main>
+
+      <!-- 404 content -->
+      <main x-bind:hidden="$store.app.currentPage !== '404'">
+        <div>
+          <h1 class="text 2xl font-bold">Page not found</h1>
+        </div>
+      </main>
     </div>
   </body>
 </html>

public/js/app.js

@@ -1,13 +1,13 @@
 // @ts-nocheck
 import "./alpine.js";
 import api from "./api.js";
+import * as utils from './utils/index.js'
+
+const pages = ['loading', 'monitoring', 'configuration', '404']
 
 document.addEventListener("alpine:init", async () => {
   Alpine.store("app", {
     is_configured: false,
-    /**
-     * Default configuration
-     */
     config: {
       mb_connection_type: "TCP",
       mb_tcp_ip: "127.0.0.1",
@@ -20,6 +20,8 @@ document.addEventListener("alpine:init", async () => {
       log_interval_ms: 1000,
     },
     currentPage: "loading",
+    error: null,
+    devices: [],
     async init() {
       try {
         const { config } = await api.get("/app/config");
@@ -29,70 +31,50 @@ document.addEventListener("alpine:init", async () => {
 
         if (config) this.config = config;
         if (is_configured) {
+          const devices = await api.get('/modbus/devices');
+          this.devices = devices;
           this.currentPage = "monitoring";
           return;
         }
 
         this.currentPage = "configuration";
       } catch (error) {
-        throw new Error("Error on initializing app.");
+        this.currentPage = 'error'
+        this.error = error;
       }
     },
+
+    setPage(page) {
+      if (!pages.includes(page)) {
+        this.currentPage = '404'
+        return;
+      }
+
+      this.currentPage = page;
+    }
   });
 
-  Alpine.data("configApp", () => ({
+  Alpine.data("configAppPage", () => ({
     selectedConnectionType: "TCP",
     isLoading: false,
     errorMessage: "",
     async configurateApp() {
-      this.isLoading = true;
+      try {
-      this.errorMessage = "";
+        this.isLoading = true;
-      let data = {};
+        this.errorMessage = "";
-      const {
+        const data = { ...this.$store.app.config };
-        mb_connection_type,
+        const body = {
-        mb_tcp_ip,
+          RTU: utils.objKeysExclude(data, ['mb_tcp_ip', 'mb_tcp_port']),
-        mb_tcp_port,
+          TCP: utils.objKeysExclude(data, ['mb_rtu_path', 'mb_rtu_baud', 'mb_rtu_parity', 'mb_rtu_data_bits', 'mb_rtu_stop_bits'])
-        mb_rtu_path,
-        mb_rtu_baud,
-        mb_rtu_parity,
-        mb_rtu_data_bits,
-        mb_rtu_stop_bits,
-        log_interval_ms,
-      } = this.$store.app.config;
-
-      if (mb_connection_type === "TCP") {
-        data = {
-          mb_connection_type,
-          mb_tcp_ip,
-          mb_tcp_port,
-          log_interval_ms,
-        };
-      }
-
-      if (mb_connection_type === "RTU") {
-        data = {
-          mb_connection_type,
-          mb_rtu_path,
-          mb_rtu_parity,
-          mb_rtu_data_bits,
-          mb_rtu_stop_bits,
-          mb_rtu_baud,
-          log_interval_ms,
-        };
-      }
-
-      if (data) {
-        await api.patch("/app/config", data);
-
-        try {
-          await api.post("/modbus/connect");
-          this.$store.app.currentPage = "monitoring";
-        } catch (error) {
-          this.errorMessage = `Modbus connection error: ${error.message}`;
         }
+        await api.patch("/app/config", body[data.mb_connection_type]);
+        await api.post("/modbus/connect");  
+        this.$store.app.currentPage = "monitoring";
+      } catch (error) {
+        this.errorMessage = `${error.message}`;
+      } finally {
+        this.isLoading = false;
       }
-
-      this.isLoading = false;
     },
   }));
 });

public/js/utils/index.js

@@ -0,0 +1 @@
+export * from './object.js'

public/js/utils/object.js

@@ -0,0 +1,11 @@
+/**
+ * Deletes specified keys from object
+ * @param {object} obj
+ * @param {string[]} keys
+ * @returns new object
+ */
+export function objKeysExclude(obj, keys) {
+  const res = structuredClone(obj);
+  Object.keys(res).forEach(k => keys.includes(k) && delete res[k]);
+  return res;
+}

routes/api.router.js

@@ -1,5 +1,4 @@
 import express from "express";
-import db from "#root/config/database.config.js";
 import modbusClient from "#root/config/modbus-client.config.js";
 
 /**
@@ -8,9 +7,9 @@ import modbusClient from "#root/config/modbus-client.config.js";
 import { appConfigSchema } from "#root/validators/index.js";
 
 /**
- * Services
+ * Controllers
  */
-import { appService } from "#root/services/index.js";
+import { appController, modbusController } from '#root/controllers/index.js'
 
 /**
  * Middlewares
@@ -19,154 +18,13 @@ import { validateBodyMiddleware } from "#root/middlewares/index.js";
 
 const apiRouter = express.Router();
 
-/**
+apiRouter.get("/app/config", appController.getConfig);
- * Get application config
+apiRouter.patch("/app/config", validateBodyMiddleware(appConfigSchema), appController.updateConfig);
- */
+apiRouter.get("/app/is_configured", appController.isConfigured);
-apiRouter.get("/app/config", async (req, res, next) => {
-  try {
-    const data = await appService.getConfig(db);
-    if (!data) return res.status(200).json({ config: null });
-    return res.status(200).json({ config: data });
-  } catch (error) {
-    next(error);
-  }
-});
 
-/**
+apiRouter.get('/modbus/devices', modbusController.list);
- * Update app configuration
+apiRouter.post("/modbus/connect", modbusController.connect);
- */
+apiRouter.post("/modbus/close", modbusController.close);
-apiRouter.patch("/app/config", validateBodyMiddleware(appConfigSchema), async (req, res, next) => {
+apiRouter.get("/modbus/data_stream", modbusController.streamData);
-  try {
-    const config = await appService.getConfig(db);
-    const payload = req.body;
-
-    if (!config) await db.run(`INSERT INTO "app_config" (id) VALUES (?)`, [0]);
-
-    /* Update TCP configuration */
-    if (payload.mb_connection_type === "TCP") {
-      const { mb_tcp_ip, mb_tcp_port } = payload;
-      await db.run(
-        `
-        UPDATE "app_config" SET id = 0, mb_connection_type = "TCP", mb_tcp_ip = ?, mb_tcp_port = ?, log_interval_ms = ?
-        `,
-        [mb_tcp_ip, mb_tcp_port, payload.log_interval_ms],
-      );
-
-      return res.status(200).json({ message: "Config Updated." });
-    }
-
-    /* Update RTU configuration */
-    if (payload.mb_connection_type === "RTU") {
-      const { mb_rtu_path, mb_rtu_baud, mb_rtu_parity, mb_rtu_data_bits, mb_rtu_stop_bits } = payload;
-      await db.run(
-        `
-        UPDATE "app_config" SET id = 0, 
-                                mb_connection_type = "RTU", 
-                                mb_rtu_path = ?, 
-                                mb_rtu_baud = ?, 
-                                mb_rtu_parity = ?, 
-                                mb_rtu_data_bits = ?, 
-                                mb_rtu_stop_bits = ?,
-                                log_interval_ms = ?
-        `,
-        [mb_rtu_path, mb_rtu_baud, mb_rtu_parity, mb_rtu_data_bits, mb_rtu_stop_bits, payload.log_interval_ms],
-      );
-      return res.status(200).json({ message: "Config updated." });
-    }
-
-    return res.status(400).json({ message: "Undefined Modbus connection type." });
-  } catch (error) {
-    next(error);
-  }
-});
-
-/**
- * Check whether the application is configured or not
- */
-apiRouter.get("/app/is_configured", async (req, res, next) => {
-  try {
-    const config = await appService.getConfig(db);
-    let is_configured = false;
-
-    if (!config) return res.status(200).json({ is_configured: false });
-
-    const isValuesExists = (colPrefix) => {
-      const keys = Object.keys(config).filter((k) => k.includes(colPrefix));
-      for (const k of keys) if (!config[k]) return false;
-      return true;
-    };
-
-    if (config.mb_connection_type === "TCP") is_configured = isValuesExists("mb_tcp");
-    if (config.mb_connection_type === "RTU") is_configured = isValuesExists("mb_rtu");
-
-    return res.status(200).json({ is_configured });
-  } catch (error) {
-    next(error);
-  }
-});
-
-/**
- * Connect to modbus network using configuration from database
- */
-apiRouter.post("/modbus/connect", async (req, res, next) => {
-  try {
-    const config = await appService.getConfig(db);
-    if (!config) return res.status(400).json({ message: "Application is not configured" });
-
-    if (modbusClient.isOpen) {
-      modbusClient.close(undefined);
-      modbusClient.destroy(undefined);
-    }
-
-    if (config.mb_connection_type === "TCP") {
-      await modbusClient.connectTCP(config.mb_tcp_ip, { port: config.mb_tcp_port });
-      return res.status(200).json({ message: "Connected." });
-    }
-
-    if (config.mb_connection_type === "RTU") {
-      await modbusClient.connectRTU(config.mb_rtu_path, {
-        baudRate: config.mb_rtu_baud,
-        dataBits: config.mb_rtu_data_bits,
-        parity: config.mb_rtu_parity,
-        stopBits: config.mb_rtu_stop_bits,
-      });
-      return res.status(200).json({ message: "Connected." });
-    }
-
-    return res.status(400).json({ message: "Connection type is invalid." });
-  } catch (error) {
-    next(error);
-  }
-});
-
-apiRouter.post("/modbus/close", (req, res, next) => {
-  try {
-    if (!modbusClient.isOpen) return res.status(400).json({ message: "Already closed." });
-    modbusClient.close(undefined);
-    modbusClient.destroy(undefined);
-  } catch (error) {
-    next(error);
-  }
-});
-
-apiRouter.get("/modbus/data_stream", async (req, res, next) => {
-  try {
-    if (!modbusClient.isOpen) return res.status(503).json({ message: "Modbus connection closed." });
-
-    res.setHeader("Cache-Control", "no-cache");
-    res.setHeader("Content-Type", "text/event-stream");
-    res.setHeader("Connection", "keep-alive");
-
-    let interval = setInterval(async () => {
-      const { data } = await modbusClient.readHoldingRegisters(0, 1);
-      res.write("event: messsage\n");
-      res.write(`data: ${JSON.stringify({ data })}`);
-      res.write("\n\n");
-    }, 1000);
-    req.on("close", () => clearInterval(interval));
-  } catch (error) {
-    next(error);
-  }
-});
 
 export { apiRouter };

scripts/db-init.script.js

@@ -1,7 +1,12 @@
-import { runQueryFromFile } from "#root/utils/database.util.js";
+import db from '#root/config/database.config.js'
 
 async function run() {
-  await runQueryFromFile("sql/init-schema.sql");
+  try {
+    await db.migrate({ force: false })
+    console.log('Database initialized.');
+  } catch (error) {
+    throw error;
+  }
 }
 
 run();

server.js

@@ -1,4 +1,4 @@
 import app from "#root/app/index.js";
 import env from "#root/config/env.config.js";
 
-app.listen(env.SERVER_PORT, () => console.log(`Web server started: http://127.0.0.1:${env.SERVER_PORT}.`));
+app.listen(env.SERVER_PORT, () => console.log(`Web server started: http://localhost:${env.SERVER_PORT}.`));

sql/init-schema.sql

@@ -1,15 +0,0 @@
-CREATE TABLE IF NOT EXISTS "app_config" (
-	"id"	INTEGER,
-	"mb_connection_type"	VARCHAR(3) NOT NULL DEFAULT "RTU" CHECK(mb_connection_type IN ('TCP','RTU')),
-	"mb_tcp_ip"	VARCHAR(15) NOT NULL DEFAULT "127.0.0.1",
-	"mb_tcp_port"	INTEGER NOT NULL DEFAULT 502,
-	"mb_rtu_path"	VARCHAR(10) NOT NULL DEFAULT "",
-	"mb_rtu_baud"	INTEGER NOT NULL DEFAULT 9600,
-	"mb_rtu_parity"	VARCHAR(5) NOT NULL DEFAULT "none" CHECK(mb_rtu_parity IN ("even", "odd", "none")),
-	"mb_rtu_data_bits"	INTEGER NOT NULL DEFAULT 8,
-	"mb_rtu_stop_bits"	INTEGER NOT NULL DEFAULT 1,
-	"log_interval_ms" INTEGER DEFAULT 1000 NOT NULL,
-	CONSTRAINT "id_unique" CHECK(id=0),
-	CONSTRAINT "min_interval_check" CHECK(log_interval_ms >= 1000)
-	PRIMARY KEY("id")
-);

utils/database.util.js

@@ -1,15 +0,0 @@
-import fs from "fs/promises";
-import db from "#root/config/database.config.js";
-
-/**
- * Reads the `.sql` file and executes the query
- * @param {string} filepath
- */
-export async function runQueryFromFile(filepath) {
-  try {
-    const query = await fs.readFile(filepath);
-    await db.run(query.toString());
-  } catch (error) {
-    throw error;
-  }
-}