removed comments var from global and all I/O of comments to/from disk

Author: Andrew Switlyk

server.js

@@ -16,23 +16,26 @@ var express = require('express');
 var bodyParser = require('body-parser');
 var app = express();
 
-var comments = JSON.parse(fs.readFileSync('_comments.json'));
-
 app.use('/', express.static(path.join(__dirname, 'public')));
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({extended: true}));
 
 app.get('/comments.json', function(req, res) {
-  comments = JSON.parse(fs.readFileSync('_comments.json'));
-  res.setHeader('Content-Type', 'application/json');
-  res.send(JSON.stringify(comments));
+  fs.readFile('_comments.json', function(err, data) {
+    res.setHeader('Content-Type', 'application/json');
+    res.send(data);
+  });
 });
 
 app.post('/comments.json', function(req, res) {
-  comments.push(req.body);
-  fs.writeFile('_comments.json', JSON.stringify(comments));
-  res.setHeader('Content-Type', 'application/json');
-  res.send(JSON.stringify(comments));
+  fs.readFile('_comments.json', function(err, data) {
+    var tempComments = JSON.parse(data);
+    tempComments.push(req.body);
+    fs.writeFile('_comments.json', JSON.stringify(tempComments), function(err) {
+      res.setHeader('Content-Type', 'application/json');
+      res.send(JSON.stringify(tempComments));
+    });
+  });
 });
 
 app.listen(3000);