+const fs = require('fs');
+
+const util = require('util');
+const execFile = util.promisify(require('child_process').execFile);
+
const express = require('express');
const app = express();
+const session = require('express-session');
+const FileStore = require('session-file-store')(session);
const http = require('http');
const server = http.createServer(app);
+const { Server } = require("socket.io");
+const io = new Server(server);
const port = 2122;
+const python_path = '/usr/bin/python3'
+const generate_image_script = '/home/cworth/src/zombocom-ai/generate-image.py'
+const state_file = 'zombocom-state.json'
+
+var state;
+
+if (!process.env.ZOMBOCOM_SESSION_SECRET) {
+ console.log("Error: Environment variable ZOMBOCOM_SESSION_SECRET not set.");
+ console.log("Please set it to a random, but persistent, value.")
+ process.exit();
+}
+
+const session_middleware = session(
+ {store: new FileStore,
+ secret: process.env.ZOMBOCOM_SESSION_SECRET,
+ resave: false,
+ saveUninitialized: true
+ });
+
+app.use(session_middleware);
+
+// convert a connect middleware to a Socket.IO middleware
+const wrap = middleware => (socket, next) => middleware(socket.request, {}, next);
+
+io.use(wrap(session_middleware));
+
+// Load comments at server startup
+fs.readFile(state_file, (err, data) => {
+ if (err)
+ state = { images: [], comments: [] };
+ else
+ state = JSON.parse(data);
+});
+
+// Save comments when server is shutting down
+function cleanup() {
+ fs.writeFileSync('zombocom-state.json', JSON.stringify(state), (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) => {
+
+ // First things first, tell the client their name (if any)
+ if (socket.request.session.name) {
+ socket.emit('inform-name', socket.request.session.name);
+ }
+
+ // Replay old comments and images to a newly-joining client
+ socket.emit('reset');
+ state.comments.forEach((comment) => {
+ socket.emit('comment', comment)
+ });
+ state.images.forEach((image) => {
+ socket.emit('image', image)
+ });
+
+ socket.on('set-name', (name) => {
+ console.log("Received set-name event: " + name);
+ socket.request.session.name = name;
+ socket.request.session.save();
+ });
+
+ // When any client comments, send that to all clients (including sender)
+ socket.on('comment', (comment) => {
+ comment.name = socket.request.session.name;
+ io.emit('comment', comment);
+ state.comments.push(comment);
+ });
+
+ // Generate an image when requested
+ socket.on('generate', (request) => {
+ console.log(`Generating image with code=${request['code']} and prompt=${request['prompt']}`);
+ async function generate_image(code, prompt) {
+ var promise;
+ if (code) {
+ promise = execFile(python_path, [generate_image_script, `--seed=${code}`, prompt])
+ } else {
+ promise = execFile(python_path, [generate_image_script, prompt])
+ }
+ const child = promise.child;
+ child.stdout.on('data', (data) => {
+ const images = JSON.parse(data);
+ images.forEach((image) => {
+ image.index = state.images.length;
+ io.emit('image', image);
+ state.images.push(image);
+ });
+ });
+ child.stderr.on('data', (data) => {
+ console.log("Error occurred during generate-image: " + data);
+ });
+ try {
+ const { stdout, stderr } = await promise;
+ } catch(e) {
+ console.error(e);
+ }
+ socket.emit('generation-done');
+ }
+ generate_image(request['code'], request['prompt']);
+ });
+});
+
server.listen(port, () => {
console.log(`listening on *:${port}`);
});
-