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@@ 1,224 @@
+use async_std::{
+ io::BufReader,
+ net::{SocketAddr, TcpListener, TcpStream},
+ prelude::*,
+ task,
+};
+use chrono::Local;
+use futures::{channel::mpsc, select, sink::SinkExt, FutureExt};
+use log::info;
+use re_redis::{init_logging, now, time_log};
+use std::{
+ collections::hash_map::{Entry, HashMap},
+ sync::Arc,
+};
+
+type Sender<T> = mpsc::UnboundedSender<T>;
+type Receiver<T> = mpsc::UnboundedReceiver<T>;
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
+
+/// By default, Redis runs on port 6379, we'll use 2000 for building this.
+const DEFAULT_PORT: u16 = 2000;
+
+/// The various events that can occur
+#[derive(Debug)]
+enum Event {
+ NewPeer {
+ stream: Arc<TcpStream>,
+ shutdown: Receiver<Void>,
+ },
+ Command {
+ msg: String,
+ },
+ Broadcast {
+ msg: String,
+ },
+}
+
+/// This empty type enforces that no messages are sent down the shutdown channel.
+#[derive(Debug)]
+enum Void {}
+
+/// A simple Redis-like server
+#[derive(Debug)]
+struct Server {
+ addr: SocketAddr,
+}
+
+impl Server {
+ /// Initialize server on localhost with given port.
+ pub fn new(port: u16) -> Self {
+ Self {
+ addr: SocketAddr::from(([127, 0, 0, 1], port)),
+ }
+ }
+
+ /// Run the server.
+ pub async fn accept_loop(&self) -> Result<()> {
+ let listener = TcpListener::bind(self.addr).await?;
+
+ // Set up broker's channel and task
+ let (broker_send, broker_recv) = mpsc::unbounded();
+ let broker_handle = task::spawn(Self::broker_loop(broker_recv));
+
+ time_log!("Server listening on {}.", listener.local_addr()?);
+
+ let mut incoming = listener.incoming();
+ while let Some(stream) = incoming.next().await {
+ let stream = stream?;
+
+ // Spawn a new independent task for each client
+ let _handle = task::spawn(Server::connection_loop(broker_send.clone(), stream));
+ }
+ drop(broker_send);
+ broker_handle.await?;
+ Ok(())
+ }
+
+ /// Handle a single connection, reading incoming messages.
+ async fn connection_loop(mut broker: Sender<Event>, stream: TcpStream) -> Result<()> {
+ let stream = Arc::new(stream); // Needed to share with connection_writer_loop
+ let reader = BufReader::new(&*stream);
+ let mut lines = reader.lines();
+
+ // First, inform the broker of the new peer
+ let (_shutdown_send, shutdown_recv) = mpsc::unbounded::<Void>();
+ broker
+ .send(Event::NewPeer {
+ stream: Arc::clone(&stream),
+ shutdown: shutdown_recv,
+ })
+ .await
+ .unwrap();
+
+ while let Some(line) = lines.next().await {
+ let line = line?;
+ let msg = line.to_string();
+ broker.send(Event::Command { msg }).await.unwrap()
+ }
+
+ Ok(())
+ }
+
+ /// Task to broker messages, keeps track of peers and an event queue
+ async fn broker_loop(events: Receiver<Event>) -> Result<()> {
+ let (disconnect_send, mut disconnect_recv) = // 1
+ mpsc::unbounded::<(usize, Receiver<String>)>();
+ let mut peers: HashMap<usize, Sender<String>> = HashMap::new();
+ let mut id: usize = 0;
+ let mut events = events.fuse();
+
+ loop {
+ let event = select! {
+ event = events.next().fuse() => match event {
+ None => break,
+ Some(event) => event,
+ },
+ disconnect = disconnect_recv.next().fuse() => {
+ let (id, _pending_messages) = disconnect.unwrap();
+ time_log!("Client {} disconnected", id);
+ assert!(peers.remove(&id).is_some());
+ continue;
+ },
+ };
+ match event {
+ Event::Broadcast { msg } => {
+ for (_id, peer) in peers.iter_mut() {
+ peer.send(msg.clone()).await?;
+ }
+ }
+ Event::Command { msg: _ } => {
+ // TODO - REDIS
+ }
+ Event::NewPeer { stream, shutdown } => {
+ match peers.entry(id) {
+ Entry::Occupied(..) => (),
+ Entry::Vacant(entry) => {
+ time_log!("New client {}: {}", id, stream.peer_addr()?);
+
+ // Send a welcome message.
+ // TODO can/should this be a separate type of Event, sent from connection_loop?
+ let welcome = format!("Hello!\nLocal time is: {}\n", now!());
+ (&*stream).write_all(welcome.as_bytes()).await?;
+
+ // Set up send/receive channels and push to broker
+ let (client_send, mut client_recv) = mpsc::unbounded();
+ entry.insert(client_send);
+
+ let mut disconnect_send = disconnect_send.clone();
+
+ Self::spawn_and_log_error(async move {
+ let res = Self::connection_writer_loop(
+ &mut client_recv,
+ stream,
+ shutdown,
+ )
+ .await;
+ disconnect_send.send((id, client_recv)).await?;
+ res
+ });
+ id += 1;
+ }
+ }
+ }
+ }
+ }
+ drop(peers);
+ drop(disconnect_send);
+ Ok(())
+ }
+
+ /// Receives messages over a channel and writes to given socket.
+ async fn connection_writer_loop(
+ messages: &mut Receiver<String>,
+ stream: Arc<TcpStream>,
+ shutdown: Receiver<Void>,
+ ) -> Result<()> {
+ let mut stream = &*stream;
+ let mut messages = messages.fuse();
+ let mut shutdown = shutdown.fuse();
+ loop {
+ select! {
+ msg = messages.next().fuse() => match msg {
+ Some(msg) => stream.write_all(msg.as_bytes()).await?,
+ None => break,
+ },
+ void = shutdown.next().fuse() => match void {
+ Some(void) => match void {}, // unreachable!(), but statically checked
+ None => break,
+ }
+ }
+ }
+ Ok(())
+ }
+
+ /// Helper to log errors as a separate task, instead of blocking/unepectedly exiting.
+ fn spawn_and_log_error<F>(fut: F) -> task::JoinHandle<()>
+ where
+ F: Future<Output = Result<()>> + Send + 'static,
+ {
+ task::spawn(async move {
+ if let Err(e) = fut.await {
+ eprintln!("{}", e)
+ }
+ })
+ }
+}
+
+impl Default for Server {
+ fn default() -> Self {
+ Self::new(DEFAULT_PORT)
+ }
+}
+
+pub fn main() -> Result<()> {
+ init_logging(2);
+ let server = Server::default();
+
+ let fut = server.accept_loop();
+ if let Err(e) = task::block_on(fut) {
+ eprintln!("Error: {}", e);
+ }
+
+ Ok(())
+}