Write comments out to disk when the server exits

[zombocom-ai] / index.js

diff --git a/index.js b/index.js
index 19035310d08d207618ebff39e06b2f0a3e4000ce..9279c877250c9e6055d142f9839dddd22dae775d 100644 (file)
--- a/index.js
+++ b/index.js
@@ -1,14 +1,48 @@
+const fs = require('fs');
+
 const express = require('express');
 const app = express();
 const http = require('http');
 const server = http.createServer(app);
+const { Server } = require("socket.io");
+const io = new Server(server);
 const port = 2122;
 
-app.get('/', (req, res) => {
+comments = [];
+
+// Save comments when server is shutting down
+function cleanup() {
+    fs.writeFileSync('zombocom-state.json', JSON.stringify(comments), (error) => {
+        if (error)
+            throw error;
+    })
+}
+
+// And connect to that on either clean exit...
+process.on('exit', cleanup);
+
+// ... or on a SIGINT (control-C)
+process.on('SIGINT', () => {
+    cleanup();
+    process.exit();
+});
+
+app.get('/index.html', (req, res) => {
     res.sendFile(__dirname + '/index.html');
 });
 
+io.on('connection', (socket) => {
+    // Replay old comments to a newly-joining client
+    comments.forEach((comment) => {
+        socket.emit('comment', comment)
+    });
+    // When any client comments, send that to all clients (including sender)
+    socket.on('comment', (comment) => {
+        io.emit('comment', comment);
+        comments.push(comment);
+    });
+});
+
 server.listen(port, () => {
     console.log(`listening on *:${port}`);
 });
-