Bring newly-commented images up to the top of the feed

[zombocom-ai] / index.js

diff --git a/index.js b/index.js
index 5e88926ae3e29db5bf7161a44e0deb10eb008d13..49a85669e45c3c436ccf2141042d4ca30f9c1339 100644 (file)
--- a/index.js
+++ b/index.js
@@ -1,28 +1,55 @@
 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 comments;
+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)
-        comments = [];
+        state = { images: [] };
     else
-        comments = JSON.parse(data);
+        state = JSON.parse(data);
 });
 
 // Save comments when server is shutting down
 function cleanup() {
-    fs.writeFileSync('zombocom-state.json', JSON.stringify(comments), (error) => {
+    fs.writeFileSync('zombocom-state.json', JSON.stringify(state), (error) => {
         if (error)
             throw error;
     })
@@ -42,14 +69,76 @@ app.get('/index.html', (req, res) => {
 });
 
 io.on('connection', (socket) => {
-    // Replay old comments to a newly-joining client
-    comments.forEach((comment) => {
-        socket.emit('comment', comment)
+
+    // 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.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) => {
+        const images = state.images;
+
+        // Send comment to clients after adding commenter's name
+        comment.name = socket.request.session.name;
         io.emit('comment', comment);
-        comments.push(comment);
+
+        const index = images.findIndex(image => image.id == comment.image_id);
+
+        // Before adding the comment to server's state, drop the image_id
+        delete comment.image_id;
+
+        // Now add the comment to the image, remove the image from the
+        // images array and then add it back at the end, (so it appears
+        // as the most-recently-modified image for any new clients)
+        const image = images[index];
+        image.comments.push(comment);
+        images.splice(index, 1);
+        images.push(image);
+    });
+
+    // Generate an image when requested
+    socket.on('generate', (request) => {
+        console.log(`Generating image for ${socket.request.session.name} with code=${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.id = 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']);
     });
 });