darkfi/bin/ircd/src/main.rs

use async_std::{
    net::{TcpListener, TcpStream},
    sync::{Arc, Mutex},
};
use std::net::SocketAddr;

use async_channel::{Receiver, Sender};
use async_executor::Executor;
use darkfi::{
    async_daemonize,
    raft::Raft,
    rpc::rpcserver::{listen_and_serve, RpcServerConfig},
    util::{
        cli::{log_config, spawn_config},
        path::{expand_path, get_config_path},
    },
    Error, Result,
};
use easy_parallel::Parallel;
use futures::{io::BufReader, AsyncBufReadExt, AsyncReadExt, FutureExt};
use log::{debug, error, info, warn};
use simplelog::{ColorChoice, TermLogger, TerminalMode};
use smol::future;
use structopt_toml::StructOptToml;

pub mod privmsg;
pub mod rpc;
pub mod server;
pub mod settings;

use crate::{
    privmsg::Privmsg,
    rpc::JsonRpcInterface,
    server::IrcServerConnection,
    settings::{Args, CONFIG_FILE, CONFIG_FILE_CONTENTS},
};

pub type SeenMsgIds = Arc<Mutex<Vec<u32>>>;

fn build_irc_msg(msg: &Privmsg) -> String {
    debug!("ABOUT TO SEND: {:?}", msg);
    let irc_msg =
        format!(":{}!anon@dark.fi PRIVMSG {} :{}\r\n", msg.nickname, msg.channel, msg.message,);
    irc_msg
}

fn clean_input(mut line: String, peer_addr: &SocketAddr) -> Result<String> {
    if line.is_empty() {
        warn!("Received empty line from {}. ", peer_addr);
        warn!("Closing connection.");
        return Err(Error::ChannelStopped)
    }

    if &line[(line.len() - 2)..] != "\r\n" {
        warn!("Closing connection.");
        return Err(Error::ChannelStopped)
    }
    // Remove CRLF
    line.pop();
    line.pop();

    Ok(line)
}

async fn broadcast_msg(
    irc_msg: String,
    peer_addr: SocketAddr,
    conn: &mut IrcServerConnection,
) -> Result<()> {
    info!("Send msg to IRC server '{}' from {}", irc_msg, peer_addr);

    if let Err(e) = conn.update(irc_msg).await {
        warn!("Connection error: {} for {}", e, peer_addr);
        return Err(Error::ChannelStopped)
    }

    Ok(())
}

async fn process(
    raft_receiver: Receiver<Privmsg>,
    stream: TcpStream,
    peer_addr: SocketAddr,
    raft_sender: Sender<Privmsg>,
    seen_msg_id: SeenMsgIds,
) -> Result<()> {
    let (reader, writer) = stream.split();

    let mut reader = BufReader::new(reader);
    let mut conn = IrcServerConnection::new(writer, seen_msg_id.clone(), raft_sender);

    loop {
        let mut line = String::new();
        futures::select! {
            privmsg = raft_receiver.recv().fuse() => {
                info!("Receive msg from raft");
                let msg = privmsg?;

                let mut smi = seen_msg_id.lock().await;
                if smi.contains(&msg.id) {
                   continue
                }
                smi.push(msg.id);
                drop(smi);

                let irc_msg = build_irc_msg(&msg);
                conn.reply(&irc_msg).await?;
            }
            err = reader.read_line(&mut line).fuse() => {
                if let Err(e) = err {
                    warn!("Read line error. Closing stream for {}: {}", peer_addr, e);
                    return Ok(())
                }
                info!("Receive msg from IRC server");
                let irc_msg = match clean_input(line, &peer_addr) {
                    Ok(m) => m,
                    Err(e) => return Err(e)
                };
                broadcast_msg(irc_msg, peer_addr,&mut conn).await?;
            }
        };
    }
}

async_daemonize!(realmain);
async fn realmain(settings: Args, executor: Arc<Executor<'_>>) -> Result<()> {
    let listener = TcpListener::bind(settings.irc_listen).await?;
    let local_addr = listener.local_addr()?;
    info!("IRC listening on {}", local_addr);

    let seen_msg_id: SeenMsgIds = Arc::new(Mutex::new(vec![]));

    //
    //Raft
    //
    let datastore_path = expand_path(&settings.datastore)?;
    let net_settings = settings.net;
    let datastore_raft = datastore_path.join("ircd.db");
    let mut raft = Raft::<Privmsg>::new(net_settings.inbound, datastore_raft)?;
    let raft_sender = raft.get_broadcast();
    let raft_receiver = raft.get_commits();

    //
    // RPC interface
    //
    let rpc_config = RpcServerConfig {
        socket_addr: settings.rpc_listen,
        use_tls: false,
        identity_path: Default::default(),
        identity_pass: Default::default(),
    };
    let executor_cloned = executor.clone();
    let rpc_interface = Arc::new(JsonRpcInterface { addr: settings.rpc_listen });
    let rpc_task = executor.spawn(async move {
        listen_and_serve(rpc_config, rpc_interface, executor_cloned.clone()).await
    });

    //
    // IRC instance
    //
    let executor_cloned = executor.clone();
    let irc_task: smol::Task<Result<()>> = executor.spawn(async move {
        loop {
            let (stream, peer_addr) = match listener.accept().await {
                Ok((s, a)) => (s, a),
                Err(e) => {
                    error!("Failed listening for connections: {}", e);
                    return Err(Error::ServiceStopped)
                }
            };

            info!("IRC Accepted client: {}", peer_addr);

            executor_cloned
                .spawn(process(
                    raft_receiver.clone(),
                    stream,
                    peer_addr,
                    raft_sender.clone(),
                    seen_msg_id.clone(),
                ))
                .detach();
        }
    });

    let (signal, shutdown) = async_channel::bounded::<()>(1);
    ctrlc_async::set_async_handler(async move {
        warn!(target: "ircd", "ircd start Exit Signal");
        // cleaning up tasks running in the background
        signal.send(()).await.unwrap();
        rpc_task.cancel().await;
        irc_task.cancel().await;
    })
    .unwrap();

    // blocking
    raft.start(net_settings.into(), executor.clone(), shutdown.clone()).await?;

    Ok(())
}