Merge pull request #24 from csc301-winter-2019/feat/8

Add live updates functionality

2 files changed, 30 insertions, 1 deletions

diff --git a/web/routes/index.js b/web/routes/index.js
index b2d0796..b2ba91f 100644
--- a/web/routes/index.js
+++ b/web/routes/index.js
@@ -2,7 +2,7 @@ var express = require('express');
 var router = express.Router();
 var Mockpoints = require('../models/mockpoints');
 var Points = require('../models/points');
-
+const connections = [];
 /* GET home page. */
 router.get('/', function(req, res, next) {
 	// for now just redirect to /map
@@ -36,10 +36,24 @@ router.post('/mobilerequest', function(req, res) {
 			console.log(`err inserting mobile request into db: ${err}`);
 			res.status(500).send({ error: "boo:(" });
 		} else {
+			// send event to all connections
+			for(var i = 0; i < connections.length; i++) {
+				connections[i].sseSend(data);
+			}
 			console.log(result);
 			res.status(200).send({'status': 'success', 'data': data});
 		}
 	});
+	
 });
 
+
+router.get('/stream', function(req, res){
+	// set up server side event (communication line between front end and server)
+	res.sseSetup();
+	// send an event to the front end to open the connection
+	res.sseSend('ok');
+	// push connection to connection array
+	connections.push(res);
+});
 module.exports = router;
diff --git a/web/routes/sse.js b/web/routes/sse.js
new file mode 100644
index 0000000..5cd9a3f
--- /dev/null
+++ b/web/routes/sse.js
@@ -0,0 +1,15 @@
+module.exports = function (req, res, next) {
+  res.sseSetup = function() {
+    res.writeHead(200, {
+      'Content-Type': 'text/event-stream',
+      'Cache-Control': 'no-cache',
+      'Connection': 'keep-alive'
+    })
+  }
+
+  res.sseSend = function(data) {
+    res.write("data: " + JSON.stringify(data) + "\n\n");
+  }
+
+  next()
+}
\ No newline at end of file