Map socket comm

app/routes/private_routes.js

@@ -6,6 +6,7 @@ const express = require('express');
 const app_conf = require("../config/app.conf.js");
 const map_conf = require("../config/map.conf.js");
 const messages = require("../config/messages.conf.js");
+const socket = require("../utils/socket.util.js");
 
 const map = require("../utils/map.util.js");
 
@@ -29,6 +30,7 @@ router.get("/disable", async (req, res) => {
     logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);
 
     fs.writeFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), "");
+    socket.broadcastMap(null);
 
     res.status(200).send();
 });
@@ -41,6 +43,7 @@ router.get("/enable", async (req, res) => {
 
     if (requested_map && map.mapExists(requested_map)) {
         fs.writeFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), requested_map);
+        socket.broadcastMap(requested_map);
 
         res.status(200).send();
     } else {
@@ -62,6 +65,7 @@ router.delete("/remove", async (req, res) => {
                 selected_map_name = fs.readFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), "utf-8");
                 if (selected_map_name == element) {
                     fs.writeFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), "");
+                    socket.broadcastMap(null);
                 }
             }
             res.status(200).send();
@@ -195,12 +199,7 @@ router.get("/", async (req, res) => {
 
     try {
         const maps = await map.getAvailableMaps();
-        var selected_map_name = "";
-
-        // Check if a map has been selected to show it
-        if (fs.existsSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"))) {
-            selected_map_name = fs.readFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), "utf-8");
-        }
+        var selected_map_name = map.getSelectedMap();
 
         // Construct the maps table
         var table_data = "";

app/utils/map.util.js

@@ -5,6 +5,18 @@ const uuid = require("uuid");
 const map_conf = require("../config/map.conf");
 const logger = require("./logger.util");
 
+// Returns map filename or ""
+function getSelectedMap() {
+    var selected_map_name = "";
+
+    // Check if a map has been selected to show it
+    if (fs.existsSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"))) {
+        selected_map_name = fs.readFileSync(path.join(path.dirname(require.main.filename), map_conf.map_storage_path, "selected"), "utf-8");
+    }
+
+    return(selected_map_name);
+}
+
 // Creates new map
 async function addMap(filename, meta, throttle, motor) {
     var total = "";
@@ -201,5 +213,6 @@ module.exports = {
     parseMapJson,
     mapExists,
     updateMap,
-    addMap
+    addMap,
+    getSelectedMap
 };

app/utils/socket.util.js

@@ -0,0 +1,65 @@
+const net = require("net");
+const fs = require("fs");
+const path = require("path");
+const map_conf = require("../config/map.conf");
+const map = require("../utils/map.util");
+const logger = require("../utils/logger.util");
+const can_conf = require("../config/can.conf")
+
+const SOCKET_PATH = path.join(path.dirname(require.main.filename), map_conf.map_storage_path, can_conf.socket_filename);
+var clients = [];
+
+if (fs.existsSync(SOCKET_PATH)) {
+    logger.info("Removing existing map socket...");
+    fs.unlinkSync(SOCKET_PATH);
+}
+
+function broadcastMap(filename) {
+    logger.info("Map updated. Broadcasting new filename to map socket...");
+
+    let message = JSON.stringify({ "map": filename });
+
+    for (c of clients) {
+        c.write(message);
+    }
+}
+
+function closeSocket() {
+    for (c of clients) {
+        c.end();
+    }
+
+    logger.info("Closing map socket.");
+    server.close();
+}
+
+const server = net.createServer((client) => {
+    // send selected map
+    logger.info("Client connected to map socket.");
+
+    var map_filename = map.getSelectedMap();
+    if (map_filename === "") {
+        map_filename = null;
+    }
+
+    client.write(JSON.stringify({"map": map_filename}));
+
+    // client array
+    clients.push(client);
+    client.on("end", () => {
+        logger.info("Client disconnected from map socket.");
+        const index = clients.indexOf(client);
+        if (index !== -1) {
+            clients.splice(index, 1);
+        }
+    });
+});
+
+server.listen(SOCKET_PATH, () => {
+    logger.info("Started map socket");
+});
+
+module.exports = {
+    broadcastMap,
+    closeSocket
+}