draw-game/src/main.rs

#![feature(proc_macro_hygiene, decl_macro)]

extern crate pretty_env_logger;
#[macro_use] extern crate log;

use futures::{FutureExt, StreamExt};
use tokio::sync::{mpsc, RwLock};
use warp::ws::{Message, WebSocket};
use warp::Filter;


#[macro_use]
extern crate anyhow;

#[macro_use]
extern crate serde;

extern crate chrono;

use chrono::prelude::*;
use std::{
    collections::BTreeMap,
    fmt::Display,
    sync::{Arc, Mutex, atomic::{AtomicUsize, Ordering}},
    time::{Duration, SystemTime},
collections::HashMap};

#[macro_use]
extern crate dotenv;

use dotenv::dotenv;

use specs::{World, WorldExt, Builder, Component, VecStorage, Entity};

/* user state from chat sample, ecs-ify it */
static NEXT_USER_ID: AtomicUsize = AtomicUsize::new(1);
type Users = Arc<RwLock<HashMap<usize, mpsc::UnboundedSender<Result<Message, warp::Error>>>>>;
/* end chat sample state */

#[derive(Component, Debug)]
#[storage(VecStorage)]
struct Name {
    name: String,
}

#[derive(Component, Debug)]
#[storage(VecStorage)]
struct Textual {
    value: String,
}

#[derive(Component, Debug)]
#[storage(VecStorage)]
struct Contains {
    children: Vec<Entity>,
}


pub struct Client {
  pub user_id: usize,
  pub topics: Vec<String>,
  pub sender: Option<mpsc::UnboundedSender<std::result::Result<Message, warp::Error>>>,
}


/*
#[get("/")]
fn index() -> Result<String, anyhow::Error> {
    Ok(format!(
        "Devices:\n{}\n\nwhile true; do curl https://pc.vvn.space/log/name; sleep 5; done",
        "aa"
    ))
}
*/

/*
#[get("/log/<device_name>/<value>")]
fn log_new(device_name: &RawStr, value: &RawStr) -> Result<String, anyhow::Error> {
    let new_event = NewEvent {
        devicename: device_name,
        value: value.parse()?,
        timestamp: &Local::now().to_rfc3339(),
    };

    Ok(String::from("Logged"))
}

#[get("/log/<device_name>")]
fn log_get(device_name: &RawStr) -> Result<String, anyhow::Error> {

    Ok("what")
}

#[get("/devices")]
fn devices_get() -> Result<String, anyhow::Error> {

    Ok("get")
}

#[get("/device/<name>")]
fn device_get(name: &RawStr) -> Result<String, anyhow::Error> {
    Ok("get")
}
*/

/*
#[catch(404)]
fn not_found() -> Option<NamedFile> {
    NamedFile::open("frontend/build/index.html").ok()
}
*/

    /*
fn main() {
    let mut world = World::new();
    world.register::<Name>();
    world.register::<Textual>();
    world.register::<Contains>();
    */
    // todo: serve static files equiv to
    /*
        .mount(
            "/",
            rocket_contrib::serve::StaticFiles::from("frontend/build"),
        )
        //.mount("/api", routes![log_new, log_get, devices_get, device_get])
        .register(catchers![not_found])
}

        */


#[tokio::main]
async fn main() {
    pretty_env_logger::init();

    // Keep track of all connected users, key is usize, value
    // is a websocket sender.
    let users = Users::default();
    // Turn our "state" into a new Filter...
    let users = warp::any().map(move || users.clone());

    // GET /chat -> websocket upgrade
    let chat = warp::path("chat")
        // The `ws()` filter will prepare Websocket handshake...
        .and(warp::ws())
        .and(users)
        .map(|ws: warp::ws::Ws, users| {
            // This will call our function if the handshake succeeds.
            ws.on_upgrade(move |socket| user_connected(socket, users))
        });

    // GET / -> index html
    let index = warp::path::end().map(|| warp::reply::html(INDEX_HTML));

    let routes = index.or(chat);

    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
}

async fn user_connected(ws: WebSocket, users: Users) {
    // Use a counter to assign a new unique ID for this user.
    let my_id = NEXT_USER_ID.fetch_add(1, Ordering::Relaxed);

    eprintln!("new chat user: {}", my_id);

    // Split the socket into a sender and receive of messages.
    let (user_ws_tx, mut user_ws_rx) = ws.split();

    // Use an unbounded channel to handle buffering and flushing of messages
    // to the websocket...
    let (tx, rx) = mpsc::unbounded_channel();
    tokio::task::spawn(rx.forward(user_ws_tx).map(|result| {
        if let Err(e) = result {
            eprintln!("websocket send error: {}", e);
        }
    }));

    // Save the sender in our list of connected users.
    users.write().await.insert(my_id, tx);

    // Return a `Future` that is basically a state machine managing
    // this specific user's connection.

    // Make an extra clone to give to our disconnection handler...
    let users2 = users.clone();

    // Every time the user sends a message, broadcast it to
    // all other users...
    while let Some(result) = user_ws_rx.next().await {
        let msg = match result {
            Ok(msg) => msg,
            Err(e) => {
                eprintln!("websocket error(uid={}): {}", my_id, e);
                break;
            }
        };
        user_message(my_id, msg, &users).await;
    }

    // user_ws_rx stream will keep processing as long as the user stays
    // connected. Once they disconnect, then...
    user_disconnected(my_id, &users2).await;
}

async fn user_message(my_id: usize, msg: Message, users: &Users) {
    // Skip any non-Text messages...
    let msg = if let Ok(s) = msg.to_str() {
        s
    } else {
        return;
    };

    let new_msg = format!("<User#{}>: {}", my_id, msg);

    // New message from this user, send it to everyone else (except same uid)...
    for (&uid, tx) in users.read().await.iter() {
        if my_id != uid {
            if let Err(_disconnected) = tx.send(Ok(Message::text(new_msg.clone()))) {
                // The tx is disconnected, our `user_disconnected` code
                // should be happening in another task, nothing more to
                // do here.
            }
        }
    }
}

async fn user_disconnected(my_id: usize, users: &Users) {
    eprintln!("good bye user: {}", my_id);

    // Stream closed up, so remove from the user list
    users.write().await.remove(&my_id);
}

static INDEX_HTML: &str = r#"<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Warp Chat</title>
    </head>
    <body>
        <h1>Warp chat</h1>
        <div id="chat">
            <p><em>Connecting...</em></p>
        </div>
        <input type="text" id="text" />
        <button type="button" id="send">Send</button>
        <script type="text/javascript">
        const chat = document.getElementById('chat');
        const text = document.getElementById('text');
        const uri = 'ws://' + location.host + '/chat';
        const ws = new WebSocket(uri);
        function message(data) {
            const line = document.createElement('p');
            line.innerText = data;
            chat.appendChild(line);
        }
        ws.onopen = function() {
            chat.innerHTML = '<p><em>Connected!</em></p>';
        };
        ws.onmessage = function(msg) {
            message(msg.data);
        };
        ws.onclose = function() {
            chat.getElementsByTagName('em')[0].innerText = 'Disconnected!';
        };
        send.onclick = function() {
            const msg = text.value;
            ws.send(msg);
            text.value = '';
            message('<You>: ' + msg);
        };
        </script>
    </body>
</html>
"#;