feat: Live check for chart stock market app (#516)

Author: a2937

Diff for: apps/chart-the-stock-market/index.js

@@ -7,6 +7,10 @@ require('dotenv').config();
 const app = express();
 app.use(express.static('public'));
 
+app.get('/status/ping', (req, res) => {
+  res.status(200).send({ msg: 'pong' });
+});
+
 const portNum = process.env.PORT || 3000;
 
 const server = app.listen(portNum, () => {
@@ -20,13 +24,16 @@ function emitStockData() {
   io.emit('updateStockData', JSON.stringify(currentStockData));
 }
 
-io.on('connection', function(socket) {
+io.on('connection', function (socket) {
   emitStockData();
 
-  socket.on('newStock', function(stock) {
-    if(!(stock.symbol in currentStockData) && Object.keys(currentStockData).length < 4) {
+  socket.on('newStock', function (stock) {
+    if (
+      !(stock.symbol in currentStockData) &&
+      Object.keys(currentStockData).length < 4
+    ) {
       const requestUrl = `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=${stock.symbol}&apikey=${process.env.APIKEY}`;
-    
+
       https.get(requestUrl, res => {
         let stockData = '';
         res.setEncoding('utf8');
@@ -38,14 +45,16 @@ io.on('connection', function(socket) {
         res.on('end', () => {
           stockData = JSON.parse(stockData);
 
-          if (stockData["Error Message"]) { //stock symbol requested doesn't exist
+          if (stockData['Error Message']) {
+            //stock symbol requested doesn't exist
             io.emit('stopLoading');
-          } else { //stock symbol requested found
-            currentStockData[stock.symbol] = stockData['Time Series (Daily)']
+          } else {
+            //stock symbol requested found
+            currentStockData[stock.symbol] = stockData['Time Series (Daily)'];
             emitStockData();
           }
 
-          res.on('error', (e) => {
+          res.on('error', e => {
             console.log('error fetching stock data');
             console.error(e);
             io.emit('stopLoading');
@@ -57,10 +66,10 @@ io.on('connection', function(socket) {
     }
   });
 
-  socket.on('deleteStock', function(stock) {
+  socket.on('deleteStock', function (stock) {
     console.log('delete' + stock);
     console.log(stock.symbol);
-    if(stock.symbol in currentStockData) {
+    if (stock.symbol in currentStockData) {
       delete currentStockData[stock.symbol];
 
       emitStockData();