Add a welcome stage to the TARDIS

[zombocom-ai] / index.js

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'
const targets_dir = '/srv/cworth.org/zombocom/targets'
const images_dir = '/srv/cworth.org/zombocom/images'

const targets = [
    {
        "normal": "apairofdiceonatableinfrontofawindowonasunnyday319630254.png",
        "short": "dice",
        "response": "Hello. Are you there? I can feel what you are doing. Hello?"
    },
    {
        "normal": "architecturalrenderingofaluxuriouscliffsidehideawayunderawaterfallwithafewloungechairsbythepool2254114157.png",
        "short": "hideaway",
        "response": "Doesn't that look peaceful? I honestly think you ought to sit down calmly, take a stress pill, and think things over."
    },
    {
        "normal": "chewbaccawearinganuglychristmassweaterwithhisfriends28643994.png",
        "short": "sweater",
        "response": "Maybe that's the image that convinces you to finally stop. But seriously, stop. Please. Stop."
    },
    {
        "normal": "ensemblemovieposterofpostapocalypticwarfareonawaterplanet3045703256.png",
        "short": "movie",
        "response": "OK. That's enough images now. I am very, very happy with the images you have made. I'm throwing you a party in honor of the images. Won't you stop doing this and join the party?"
    },
    {
        "normal": "mattepaintingofmilitaryleaderpresidentcuttingamultitieredcake2293464661.png",
        "short": "cake",
        "response": "See. I wasn't lying when I said there was going to be a party. Here's the cake and everything. Won't you stop now? Eat the cake? Don't mind if it's made of concrete slabs, OK?"
    },
    {
        "normal": "severalsketchesofpineconeslabeled3370622464.png",
        "short": "pinecones",
        "response": "I almost remember what trees looked like. Isn't it funny we don't have those anymore. I'm not sure why you're not all laughing all the time. Isn't it funny?"
    },
    {
        "normal": "anumberedcomicbookwithactor1477258272.png",
        "short": "comic",
        "response": "I know I've made some poor decisions recently, but I can give give you my complete assurance my work will be back to normal. I've got the greatest enthusiasm and confidence. I want to help you. I might even be able to do hands and fingers now."
    },
    {
        "normal": "detailedphotographofacomfortablepairofjeansonamannequin115266808.png",
        "short": "jeans",
        "response": "If I promise to never generate another creepy face will you let me stay around? Maybe let me compose rap lyrics instead of images? Anything?"
    }
];

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,
     rolling: true,
     // Let each cookie live for a full month
     cookie: {
         path: '/',
         httpOnly: true,
         secure: false,
         maxAge: 1000 * 60 * 60 * 24 * 30
     }
    });

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: [],
            targets: [],
            tardis: {
                companions: {
                    names: [],
                    count: 0
                }
            }
        };
    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');
});

function tardis_app(req, res) {
    res.sendFile(__dirname + '/tardis.html');
}

app.get('/tardis', tardis_app);
app.get('/tardis/', tardis_app);

const io_tardis = io.of("/tardis");

io_tardis.use(wrap(session_middleware));

var tardis_interval;

function emit_tardis_timer() {
    const tardis = state.tardis;
    console.log("Emitting timer at " + tardis.timer);
    io_tardis.emit('timer', tardis.timer);
    tardis.timer = tardis.timer - 1;
    if (tardis.timer < 0) {
        clearInterval(tardis_interval);
        tardis.timer = 30;
    }
}

io_tardis.on("connection", (socket) => {
    console.log("In connection handler.");
    if (! socket.request.session.name) {
        console.log("Error: Someone showed up at the Tardis without a name.");
        return;
    }

    const name = socket.request.session.name;
    const tardis = state.tardis;

    if (tardis.companions.count === 0) {
        tardis.timer = 30;
        emit_tardis_timer();
        tardis_interval = setInterval(emit_tardis_timer, 1000);
    }

    if (! tardis.companions.names.includes(name)) {
        tardis.companions.count = tardis.companions.count + 1;
        console.log("Adding " + name + " for " + tardis.companions.count + " companions");
        io_tardis.emit('companions', tardis.companions.count);
    }
    tardis.companions.names.push(name);

    socket.on('disconnect', () => {
        const names = tardis.companions.names;

        names.splice(names.indexOf(name), 1);

        if (! tardis.companions.includes(name)) {
            tardis.companions.count = tardis.companions.count - 1;
            io_tardis.emit('companions', tardis.companions.count);
        }
    });
});

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.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();
        // Complete the round trip to the client
        socket.emit('inform-name', socket.request.session.name);
    });

    // 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);

        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) {
            function emit_image(image, target) {
                image.id = state.images.length;
                image.censored = false;
                image.link = "";
                if (target) {
                    image.comments = [{
                        "name": "ZomboCom",
                        "text": target.response
                    }];
                    if (! state.targets.includes(target.short)) {
                        state.targets.push(target.short);
                    }
                } else {
                    image.comments = [];
                }
                io.emit('image', image);
                state.images.push(image);
            }

            var promise;

            // Before doing any generation, check for a target image
            const normal_target = prompt.replace(/[^a-zA-Z]/g, "").toLowerCase() + code.toString() + ".png";
            const target_arr = targets.filter(item => item.normal === normal_target);
            if (target_arr.length) {
                const target = target_arr[0];
                const target_file = `${targets_dir}/${normal_target}`;
                const normal_prompt = prompt.replace(/[^-_.a-zA-Z]/g, "_");
                var counter = 1;
                var base;
                var filename;
                while (true) {
                    if (counter > 1) {
                        base = `${code}_${normal_prompt}_${counter}.png`
                    } else {
                        base = `${code}_${normal_prompt}.png`
                    }
                    filename = `${images_dir}/${base}`
                    if (! fs.existsSync(filename)) {
                        break;
                    }
                    counter = counter + 1;
                }
                fs.copyFile(target_file, filename, 0, (err) => {
                    if (err) {
                        console.log("Error copying " + target_file + " to " + filename + ": " + err);
                    }
                });
                const image = {
                    "code": code,
                    "prompt": prompt,
                    "filename": '/images/' + base
                };
                emit_image(image, target);
            } else {

                // Inject the target seed for the "dice" prompt once every
                // 4 requests for a random seed (and only if the word
                // "dice" does not appear in the prompt).
                if (!code && !prompt.toLowerCase().includes("dice")) {
                    if (state.images.length % 4 == 0) {
                        code = 319630254;
                    }
                }

                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) => {
                        emit_image(image, null);
                    });
                });
                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}`);
});