Update App Server

- Use App server port for Websocket Server.
- pause/resume serving and market when node acts as slave/master respectively.

src/app.js

@@ -3,11 +3,17 @@ const express = require('express');
 const cookieParser = require("cookie-parser");
 const sessions = require('express-session');
 const Request = require('./request');
+const WebSocket = require('ws');
 
 const REFRESH_INTERVAL = 5 * 1000; //10 * 60 * 1000;
 
-module.exports = function App(secret, trustedIDs, DB) {
+module.exports = function App(secret, DB) {
 
+    if (!(this instanceof App))
+        return new App(secret, DB);
+
+    var server = null,
+        wss = null;
     const app = express();
     //session middleware
     app.use(sessions({
@@ -65,12 +71,67 @@ module.exports = function App(secret, trustedIDs, DB) {
     app.post('/withdraw-rupee', Request.WithdrawRupee);
 
     //Manage user tags (Access to trusted IDs only)
-    Request.trustedIDs = trustedIDs;
+
     app.post('/add-tag', Request.addUserTag);
     app.post('/remove-tag', Request.removeUserTag);
 
     Request.DB = DB;
-    Request.periodicProcess();
-    let refresher = setInterval(Request.periodicProcess, REFRESH_INTERVAL);
-    return app;
+
+    //Properties
+    var periodInstance = null;
+    let self = this;
+
+    //return server, express-app, wss
+    Object.defineProperty(self, "server", {
+        get: () => server
+    });
+    Object.defineProperty(self, "express", {
+        get: () => app
+    });
+    Object.defineProperty(self, "wss", {
+        get: () => wss
+    });
+
+    //set trustedID for subAdmin requests
+    Object.defineProperty(self, "trustedIDs", {
+        set: (ids) => Request.trustedIDs = ids
+    });
+
+    //Start (or) Stop servers
+    self.start = (port) => new Promise(resolve => {
+        server = app.listen(port, () => {
+            wss = new WebSocket.Server({
+                server
+            });
+            resolve(`Server Running at port ${port}`);
+        });
+    });
+    self.stop = () => new Promise(resolve => {
+        server.close(() => {
+            server = null;
+            wss = null;
+            resolve('Server stopped')
+        });
+    });
+
+    //(Node is not master) Pause serving the clients
+    self.pause = () => {
+        Request.pause();
+        if (periodInstance !== null) {
+            clearInterval(periodInstance);
+            periodInstance = null;
+        }
+    }
+
+    //(Node is master) Resume serving the clients
+    self.resume = () => {
+        Request.resume();
+        Request.periodicProcess();
+        if (periodInstance === null)
+            periodInstance = setInterval(Request.periodicProcess, REFRESH_INTERVAL);
+    }
+
+    Object.defineProperty(self, "periodInstance", {
+        get: () => periodInstance
+    });
 }

src/market.js

@@ -54,10 +54,6 @@ const tokenAPI = {
     }
 }
 
-function returnRates() {
-    return coupling.price.currentRate;
-}
-
 function addSellOrder(floID, quantity, min_price) {
     return new Promise((resolve, reject) => {
         if (!floID || !floCrypto.validateAddr(floID))
@@ -505,7 +501,9 @@ function blockchainReCheck() {
 }
 
 module.exports = {
-    returnRates,
+    get rate() {
+        return coupling.price.currentRate;
+    },
     addBuyOrder,
     addSellOrder,
     cancelOrder,

src/request.js

@@ -21,8 +21,13 @@ INTERNAL.e_code = 500;
 const oneDay = 1000 * 60 * 60 * 24;
 const maxSessionTimeout = 60 * oneDay;
 
+var serving;
+const INVALID_SERVER_MSG = "Incorrect Server. Please connect to main server.";
+
 function validateRequestFromFloID(request, sign, floID, proxy = true) {
     return new Promise((resolve, reject) => {
+        if (!serving)
+            return reject(INVALID(INVALID_SERVER_MSG));
         DB.query("SELECT " + (proxy ? "proxyKey AS pubKey FROM Sessions" : "pubKey FROM Users") + " WHERE floID=?", [floID]).then(result => {
             if (result.length < 1)
                 return reject(INVALID(proxy ? "Session not active" : "User not registered"));
@@ -53,6 +58,8 @@ function storeRequest(floID, req_str, sign) {
 }
 
 function SignUp(req, res) {
+    if (!serving)
+        return res.status(INVALID.e_code).send(INVALID_SERVER_MSG);
     let data = req.body,
         session = req.session;
     if (floCrypto.getFloID(data.pubKey) !== data.floID)
@@ -249,11 +256,15 @@ function ListTransactions(req, res) {
 }
 
 function getRate(req, res) {
-    let rate = market.returnRates();
-    res.send(`${rate}`);
+    if (!serving)
+        res.status(INVALID.e_code).send(INVALID_SERVER_MSG);
+    else
+        res.send(`${market.rate}`);
 }
 
 function Account(req, res) {
+    if (!serving)
+        return res.status(INVALID.e_code).send(INVALID_SERVER_MSG);
     const setLogin = function(message) {
         let randID = floCrypto.randString(16, true);
         req.session.random = randID;
@@ -506,5 +517,11 @@ module.exports = {
     set DB(db) {
         DB = db;
         market.DB = db;
+    },
+    pause() {
+        serving = false;
+    },
+    resume() {
+        serving = true;
     }
 };