WIP: aquatic_ws network: organize into submodule, other small fixes

aquatic_ws/src/lib/network/mod.rs

@@ -0,0 +1,545 @@
+use std::time::Duration;
+use std::io::ErrorKind;
+
+use tungstenite::WebSocket;
+use tungstenite::handshake::{HandshakeError, server::ServerHandshake};
+use hashbrown::HashMap;
+use native_tls::{TlsAcceptor, TlsStream};
+
+use mio::{Events, Poll, Interest, Token};
+use mio::net::{TcpListener, TcpStream};
+
+use crate::common::*;
+use crate::config::Config;
+use crate::protocol::*;
+
+pub mod common;
+pub mod utils;
+
+use common::*;
+use utils::*;
+
+
+pub fn run_socket_worker(
+    config: Config,
+    socket_worker_index: usize,
+    in_message_sender: InMessageSender,
+    out_message_receiver: OutMessageReceiver,
+    use_tls: bool
+){
+    let poll_timeout = Duration::from_millis(
+        config.network.poll_timeout_milliseconds
+    );
+
+    let mut listener = TcpListener::from_std(create_listener(&config));
+    let mut poll = Poll::new().expect("create poll");
+    let mut events = Events::with_capacity(config.network.poll_event_capacity);
+
+    poll.registry()
+        .register(&mut listener, Token(0), Interest::READABLE)
+        .unwrap();
+
+    let opt_tls_acceptor = if use_tls {
+        Some(create_tls_acceptor(&config))
+    } else {
+        None
+    };
+
+    let mut connections: ConnectionMap = HashMap::new();
+
+    let mut poll_token_counter = Token(0usize);
+    let mut iter_counter = 0usize;
+
+    loop {
+        poll.poll(&mut events, Some(poll_timeout))
+            .expect("failed polling");
+        
+        let valid_until = ValidUntil::new(config.cleaning.max_connection_age);
+
+        for event in events.iter(){
+            let token = event.token();
+
+            if token.0 == 0 {
+                accept_new_streams(
+                    &mut listener,
+                    &mut poll,
+                    &mut connections,
+                    valid_until,
+                    &mut poll_token_counter,
+                );
+            } else if event.is_readable(){
+                run_handshakes_and_read_messages(
+                    socket_worker_index,
+                    &in_message_sender,
+                    &opt_tls_acceptor,
+                    &mut poll,
+                    &mut connections,
+                    token,
+                    valid_until,
+                );
+            }
+        }
+
+        send_out_messages(
+            out_message_receiver.drain(),
+            &mut poll,
+            &mut connections
+        );
+
+        // Remove inactive connections, but not every iteration
+        if iter_counter % 128 == 0 {
+            remove_inactive_connections(&mut poll, &mut connections);
+        }
+
+        iter_counter = iter_counter.wrapping_add(1);
+    }
+}
+
+
+fn accept_new_streams(
+    listener: &mut TcpListener,
+    poll: &mut Poll,
+    connections: &mut ConnectionMap,
+    valid_until: ValidUntil,
+    poll_token_counter: &mut Token,
+){
+    loop {
+        match listener.accept(){
+            Ok((mut stream, _)) => {
+                poll_token_counter.0 = poll_token_counter.0.wrapping_add(1);
+
+                if poll_token_counter.0 == 0 {
+                    poll_token_counter.0 = 1;
+                }
+
+                let token = *poll_token_counter;
+
+                remove_connection_if_exists(poll, connections, token);
+
+                poll.registry()
+                    .register(&mut stream, token, Interest::READABLE)
+                    .unwrap();
+
+                let connection = Connection {
+                    valid_until,
+                    stage: ConnectionStage::TcpStream(stream)
+                };
+
+                connections.insert(token, connection);
+            },
+            Err(err) => {
+                if err.kind() == ErrorKind::WouldBlock {
+                    break
+                }
+
+                eprint!("{}", err);
+            }
+        }
+    }
+}
+
+
+pub fn handle_tls_handshake_result(
+    connections: &mut ConnectionMap,
+    poll_token: Token,
+    valid_until: ValidUntil,
+    result: Result<TlsStream<TcpStream>, native_tls::HandshakeError<TcpStream>>,
+) -> bool {
+    match result {
+        Ok(stream) => {
+            println!("handshake established");
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::TlsStream(stream)
+            };
+
+            connections.insert(poll_token, connection);
+
+            false
+        },
+        Err(native_tls::HandshakeError::WouldBlock(handshake)) => {
+            println!("interrupted");
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::TlsMidHandshake(handshake),
+            };
+
+            connections.insert(poll_token, connection);
+
+            true
+        },
+        Err(native_tls::HandshakeError::Failure(err)) => {
+            dbg!(err);
+
+            false
+        }
+    }
+}
+
+
+pub fn handle_ws_handshake_no_tls_result(
+    connections: &mut ConnectionMap,
+    poll_token: Token,
+    valid_until: ValidUntil,
+    result: Result<WebSocket<TcpStream>, HandshakeError<ServerHandshake<TcpStream, DebugCallback>>> ,
+) -> bool {
+    match result {
+        Ok(mut ws) => {
+            println!("handshake established");
+
+            let peer_addr = ws.get_mut().peer_addr().unwrap();
+
+            let established_ws = EstablishedWs {
+                ws,
+                peer_addr,
+            };
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::EstablishedWsNoTls(established_ws)
+            };
+
+            connections.insert(poll_token, connection);
+
+            false
+        },
+        Err(HandshakeError::Interrupted(handshake)) => {
+            println!("interrupted");
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::WsHandshakeNoTls(handshake),
+            };
+
+            connections.insert(poll_token, connection);
+
+            true
+        },
+        Err(HandshakeError::Failure(err)) => {
+            dbg!(err);
+
+            false
+        }
+    }
+}
+
+
+pub fn handle_ws_handshake_tls_result(
+    connections: &mut ConnectionMap,
+    poll_token: Token,
+    valid_until: ValidUntil,
+    result: Result<WebSocket<Stream>, HandshakeError<ServerHandshake<Stream, DebugCallback>>> ,
+) -> bool {
+    match result {
+        Ok(mut ws) => {
+            println!("handshake established");
+
+            let peer_addr = ws.get_mut().get_mut().peer_addr().unwrap();
+
+            let established_ws = EstablishedWs {
+                ws,
+                peer_addr,
+            };
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::EstablishedWsTls(established_ws)
+            };
+
+            connections.insert(poll_token, connection);
+
+            false
+        },
+        Err(HandshakeError::Interrupted(handshake)) => {
+            println!("interrupted");
+
+            let connection = Connection {
+                valid_until,
+                stage: ConnectionStage::WsHandshakeTls(handshake),
+            };
+
+            connections.insert(poll_token, connection);
+
+            true
+        },
+        Err(HandshakeError::Failure(err)) => {
+            dbg!(err);
+
+            false
+        }
+    }
+}
+
+
+// Macro hack to not have to write the following twice in
+// `run_handshakes_and_read_messages` (putting it in a function causes error
+// because of multiple mutable references)
+macro_rules! read_ws_messages {
+    (
+        $socket_worker_index: ident,
+        $in_message_sender: ident,
+        $poll: ident,
+        $connections: ident,
+        $poll_token: ident,
+        $established_ws: ident
+    ) => {
+        println!("conn established");
+
+        match $established_ws.ws.read_message(){
+            Ok(ws_message) => {
+                dbg!(ws_message.clone());
+
+                if let Some(in_message) = InMessage::from_ws_message(ws_message){
+                    dbg!(in_message.clone());
+
+                    let meta = ConnectionMeta {
+                        worker_index: $socket_worker_index,
+                        poll_token: $poll_token,
+                        peer_addr: $established_ws.peer_addr
+                    };
+
+                    $in_message_sender.send((meta, in_message));
+                }
+            },
+            Err(tungstenite::Error::Io(err)) => {
+                if err.kind() == ErrorKind::WouldBlock {
+                    break;
+                }
+
+                remove_connection_if_exists($poll, $connections, $poll_token);
+
+                eprint!("{}", err);
+
+                break;
+            },
+            Err(tungstenite::Error::ConnectionClosed) => {
+                remove_connection_if_exists($poll, $connections, $poll_token);
+
+                break;
+            },
+            Err(err) => {
+                dbg!(err);
+
+                remove_connection_if_exists($poll, $connections, $poll_token);
+
+                break;
+            }
+        } 
+    };
+}
+
+
+/// Get TLS (if requested) and tungstenite up and running, then read messages
+pub fn run_handshakes_and_read_messages(
+    socket_worker_index: usize,
+    in_message_sender: &InMessageSender,
+    opt_tls_acceptor: &Option<TlsAcceptor>, // If set, run TLS
+    poll: &mut Poll,
+    connections: &mut ConnectionMap,
+    poll_token: Token,
+    valid_until: ValidUntil,
+){
+    println!("poll_token: {}", poll_token.0);
+
+    loop {
+        let established = match connections.get(&poll_token).map(|c| &c.stage){
+            Some(stage) => stage.is_established(),
+            None => break,
+        };
+
+        if !established {
+            let conn = connections.remove(&poll_token).unwrap();
+
+            match conn.stage {
+                ConnectionStage::TcpStream(stream) => {
+                    if let Some(tls_acceptor) = opt_tls_acceptor {
+                        let stop_loop = handle_tls_handshake_result(
+                            connections,
+                            poll_token,
+                            valid_until,
+                            tls_acceptor.accept(stream)
+                        );
+    
+                        if stop_loop {
+                            break;
+                        }
+                    } else {
+                        let handshake_result = ::tungstenite::server::accept_hdr(
+                            stream,
+                            DebugCallback
+                        );
+
+                        let stop_loop = handle_ws_handshake_no_tls_result(
+                            connections,
+                            poll_token,
+                            valid_until,
+                            handshake_result
+                        );
+
+                        if stop_loop {
+                            break;
+                        }
+                    }
+                },
+                ConnectionStage::TlsMidHandshake(handshake) => {
+                    let stop_loop = handle_tls_handshake_result(
+                        connections,
+                        poll_token,
+                        valid_until,
+                        handshake.handshake()
+                    );
+
+                    if stop_loop {
+                        break;
+                    }
+                },
+                ConnectionStage::TlsStream(stream) => {
+                    let handshake_result = ::tungstenite::server::accept_hdr(
+                        stream,
+                        DebugCallback
+                    );
+
+                    let stop_loop = handle_ws_handshake_tls_result(
+                        connections,
+                        poll_token,
+                        valid_until,
+                        handshake_result
+                    );
+
+                    if stop_loop {
+                        break;
+                    }
+                },
+                ConnectionStage::WsHandshakeNoTls(handshake) => {
+                    let stop_loop = handle_ws_handshake_no_tls_result(
+                        connections,
+                        poll_token,
+                        valid_until,
+                        handshake.handshake()
+                    );
+
+                    if stop_loop {
+                        break;
+                    }
+                },
+                ConnectionStage::WsHandshakeTls(handshake) => {
+                    let stop_loop = handle_ws_handshake_tls_result(
+                        connections,
+                        poll_token,
+                        valid_until,
+                        handshake.handshake()
+                    );
+
+                    if stop_loop {
+                        break;
+                    }
+                },
+                ConnectionStage::EstablishedWsNoTls(_) => unreachable!(),
+                ConnectionStage::EstablishedWsTls(_) => unreachable!(),
+            }
+        } else {
+            match connections.get_mut(&poll_token){
+                Some(Connection{
+                    stage: ConnectionStage::EstablishedWsNoTls(established_ws),
+                    ..
+                }) => {
+                    read_ws_messages!(
+                        socket_worker_index,
+                        in_message_sender,
+                        poll,
+                        connections,
+                        poll_token,
+                        established_ws
+                    );
+                },
+                Some(Connection{
+                    stage: ConnectionStage::EstablishedWsTls(established_ws),
+                    ..
+                }) => {
+                    read_ws_messages!(
+                        socket_worker_index,
+                        in_message_sender,
+                        poll,
+                        connections,
+                        poll_token,
+                        established_ws
+                    );
+                },
+                _ => ()
+            }
+        }
+    }
+}
+
+
+/// Read messages from channel, send to peers
+pub fn send_out_messages(
+    out_message_receiver: ::flume::Drain<(ConnectionMeta, OutMessage)>,
+    poll: &mut Poll,
+    connections: &mut ConnectionMap,
+){
+    for (meta, out_message) in out_message_receiver {
+        let opt_stage = connections
+            .get_mut(&meta.poll_token)
+            .map(|v| &mut v.stage);
+        
+        use ::tungstenite::Error::Io;
+        
+        // Exactly the same for both established stages
+        match opt_stage {
+            Some(ConnectionStage::EstablishedWsNoTls(connection)) => {
+                if connection.peer_addr != meta.peer_addr {
+                    eprintln!("socket worker: peer socket addrs didn't match");
+
+                    continue;
+                }
+
+                dbg!(out_message.clone());
+
+                match connection.ws.write_message(out_message.to_ws_message()){
+                    Ok(()) => {},
+                    Err(Io(err)) if err.kind() == ErrorKind::WouldBlock => {
+                        continue;
+                    },
+                    Err(err) => {
+                        dbg!(err);
+
+                        remove_connection_if_exists(
+                            poll,
+                            connections,
+                            meta.poll_token
+                        );
+                    },
+                }
+            },
+            Some(ConnectionStage::EstablishedWsTls(connection)) => {
+                if connection.peer_addr != meta.peer_addr {
+                    eprintln!("socket worker: peer socket addrs didn't match");
+
+                    continue;
+                }
+
+                dbg!(out_message.clone());
+
+                match connection.ws.write_message(out_message.to_ws_message()){
+                    Ok(()) => {},
+                    Err(Io(err)) if err.kind() == ErrorKind::WouldBlock => {
+                        continue;
+                    },
+                    Err(err) => {
+                        dbg!(err);
+
+                        remove_connection_if_exists(
+                            poll,
+                            connections,
+                            meta.poll_token
+                        );
+                    },
+                }
+            },
+            _ => {},
+        }
+    }
+}