--- /dev/null
+extern crate bytes;
+extern crate tokio;
+extern crate tokio_codec;
+extern crate futures;
+extern crate lightning;
+extern crate secp256k1;
+
+use bytes::BufMut;
+
+use futures::future;
+use futures::future::Future;
+use futures::{AsyncSink, Stream, Sink};
+use futures::sync::mpsc;
+
+use secp256k1::key::PublicKey;
+
+use tokio::timer::Delay;
+use tokio::net::TcpStream;
+
+use lightning::ln::peer_handler;
+use lightning::ln::peer_handler::SocketDescriptor as LnSocketTrait;
+
+use std::mem;
+use std::net::SocketAddr;
+use std::sync::{Arc, Mutex};
+use std::sync::atomic::{AtomicU64, Ordering};
+use std::time::{Duration, Instant};
+use std::vec::Vec;
+use std::hash::Hash;
+
+static ID_COUNTER: AtomicU64 = AtomicU64::new(0);
+
+/// A connection to a remote peer. Can be constructed either as a remote connection using
+/// Connection::setup_outbound o
+pub struct Connection {
+ writer: Option<mpsc::Sender<bytes::Bytes>>,
+ event_notify: mpsc::Sender<()>,
+ pending_read: Vec<u8>,
+ read_blocker: Option<futures::sync::oneshot::Sender<Result<(), ()>>>,
+ read_paused: bool,
+ need_disconnect: bool,
+ id: u64,
+}
+impl Connection {
+ fn schedule_read(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>, us: Arc<Mutex<Self>>, reader: futures::stream::SplitStream<tokio_codec::Framed<TcpStream, tokio_codec::BytesCodec>>) {
+ let us_ref = us.clone();
+ let us_close_ref = us.clone();
+ let peer_manager_ref = peer_manager.clone();
+ tokio::spawn(reader.for_each(move |b| {
+ let pending_read = b.to_vec();
+ {
+ let mut lock = us_ref.lock().unwrap();
+ assert!(lock.pending_read.is_empty());
+ if lock.read_paused {
+ lock.pending_read = pending_read;
+ let (sender, blocker) = futures::sync::oneshot::channel();
+ lock.read_blocker = Some(sender);
+ return future::Either::A(blocker.then(|_| { Ok(()) }));
+ }
+ }
+ //TODO: There's a race where we don't meet the requirements of disconnect_socket if its
+ //called right here, after we release the us_ref lock in the scope above, but before we
+ //call read_event!
+ match peer_manager.read_event(&mut SocketDescriptor::new(us_ref.clone(), peer_manager.clone()), pending_read) {
+ Ok(pause_read) => {
+ if pause_read {
+ let mut lock = us_ref.lock().unwrap();
+ lock.read_paused = true;
+ }
+ },
+ Err(e) => {
+ us_ref.lock().unwrap().need_disconnect = false;
+ return future::Either::B(future::result(Err(std::io::Error::new(std::io::ErrorKind::InvalidData, e))));
+ }
+ }
+
+ if let Err(e) = us_ref.lock().unwrap().event_notify.try_send(()) {
+ // Ignore full errors as we just need them to poll after this point, so if the user
+ // hasn't received the last send yet, it doesn't matter.
+ assert!(e.is_full());
+ }
+
+ future::Either::B(future::result(Ok(())))
+ }).then(move |_| {
+ if us_close_ref.lock().unwrap().need_disconnect {
+ peer_manager_ref.disconnect_event(&SocketDescriptor::new(us_close_ref, peer_manager_ref.clone()));
+ println!("Peer disconnected!");
+ } else {
+ println!("We disconnected peer!");
+ }
+ Ok(())
+ }));
+ }
+
+ fn new(event_notify: mpsc::Sender<()>, stream: TcpStream) -> (futures::stream::SplitStream<tokio_codec::Framed<TcpStream, tokio_codec::BytesCodec>>, Arc<Mutex<Self>>) {
+ let (writer, reader) = tokio_codec::Framed::new(stream, tokio_codec::BytesCodec::new()).split();
+ let (send_sink, send_stream) = mpsc::channel(3);
+ tokio::spawn(writer.send_all(send_stream.map_err(|_| -> std::io::Error {
+ unreachable!();
+ })).then(|_| {
+ future::result(Ok(()))
+ }));
+ let us = Arc::new(Mutex::new(Self { writer: Some(send_sink), event_notify, pending_read: Vec::new(), read_blocker: None, read_paused: false, need_disconnect: true, id: ID_COUNTER.fetch_add(1, Ordering::AcqRel) }));
+
+ (reader, us)
+ }
+
+ /// Process incoming messages and feed outgoing messages on the provided socket generated by
+ /// accepting an incoming connection (by scheduling futures with tokio::spawn).
+ ///
+ /// You should poll the Receive end of event_notify and call get_and_clear_pending_events() on
+ /// ChannelManager and ChannelMonitor objects.
+ pub fn setup_inbound(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>, event_notify: mpsc::Sender<()>, stream: TcpStream) {
+ let (reader, us) = Self::new(event_notify, stream);
+
+ if let Ok(_) = peer_manager.new_inbound_connection(SocketDescriptor::new(us.clone(), peer_manager.clone())) {
+ Self::schedule_read(peer_manager, us, reader);
+ }
+ }
+
+ /// Process incoming messages and feed outgoing messages on the provided socket generated by
+ /// making an outbound connection which is expected to be accepted by a peer with the given
+ /// public key (by scheduling futures with tokio::spawn).
+ ///
+ /// You should poll the Receive end of event_notify and call get_and_clear_pending_events() on
+ /// ChannelManager and ChannelMonitor objects.
+ pub fn setup_outbound(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>, event_notify: mpsc::Sender<()>, their_node_id: PublicKey, stream: TcpStream) {
+ let (reader, us) = Self::new(event_notify, stream);
+
+ if let Ok(initial_send) = peer_manager.new_outbound_connection(their_node_id, SocketDescriptor::new(us.clone(), peer_manager.clone())) {
+ if SocketDescriptor::new(us.clone(), peer_manager.clone()).send_data(&initial_send, 0, true) == initial_send.len() {
+ Self::schedule_read(peer_manager, us, reader);
+ } else {
+ println!("Failed to write first full message to socket!");
+ }
+ }
+ }
+
+ /// Process incoming messages and feed outgoing messages on a new connection made to the given
+ /// socket address which is expected to be accepted by a peer with the given public key (by
+ /// scheduling futures with tokio::spawn).
+ ///
+ /// You should poll the Receive end of event_notify and call get_and_clear_pending_events() on
+ /// ChannelManager and ChannelMonitor objects.
+ pub fn connect_outbound(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>, event_notify: mpsc::Sender<()>, their_node_id: PublicKey, addr: SocketAddr) {
+ let connect_timeout = Delay::new(Instant::now() + Duration::from_secs(10)).then(|_| {
+ future::err(std::io::Error::new(std::io::ErrorKind::TimedOut, "timeout reached"))
+ });
+ tokio::spawn(TcpStream::connect(&addr).select(connect_timeout)
+ .and_then(move |stream| {
+ Connection::setup_outbound(peer_manager, event_notify, their_node_id, stream.0);
+ future::ok(())
+ }).or_else(|_| {
+ //TODO: return errors somehow
+ future::ok(())
+ }));
+ }
+}
+
+#[derive(Clone)]
+pub struct SocketDescriptor {
+ conn: Arc<Mutex<Connection>>,
+ id: u64,
+ peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>,
+}
+impl SocketDescriptor {
+ fn new(conn: Arc<Mutex<Connection>>, peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor>>) -> Self {
+ let id = conn.lock().unwrap().id;
+ Self { conn, id, peer_manager }
+ }
+}
+impl peer_handler::SocketDescriptor for SocketDescriptor {
+ fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, resume_read: bool) -> usize {
+ macro_rules! schedule_read {
+ ($us_ref: expr) => {
+ tokio::spawn(future::lazy(move || -> Result<(), ()> {
+ let mut read_data = Vec::new();
+ {
+ let mut us = $us_ref.conn.lock().unwrap();
+ mem::swap(&mut read_data, &mut us.pending_read);
+ }
+ if !read_data.is_empty() {
+ let mut us_clone = $us_ref.clone();
+ match $us_ref.peer_manager.read_event(&mut us_clone, read_data) {
+ Ok(pause_read) => {
+ if pause_read { return Ok(()); }
+ },
+ Err(_) => {
+ //TODO: Not actually sure how to do this
+ return Ok(());
+ }
+ }
+ }
+ let mut us = $us_ref.conn.lock().unwrap();
+ if let Some(sender) = us.read_blocker.take() {
+ sender.send(Ok(())).unwrap();
+ }
+ us.read_paused = false;
+ if let Err(e) = us.event_notify.try_send(()) {
+ // Ignore full errors as we just need them to poll after this point, so if the user
+ // hasn't received the last send yet, it doesn't matter.
+ assert!(e.is_full());
+ }
+ Ok(())
+ }));
+ }
+ }
+
+ let mut us = self.conn.lock().unwrap();
+ if resume_read {
+ let us_ref = self.clone();
+ schedule_read!(us_ref);
+ }
+ if data.len() == write_offset { return 0; }
+ if us.writer.is_none() {
+ us.read_paused = true;
+ return 0;
+ }
+
+ let mut bytes = bytes::BytesMut::with_capacity(data.len() - write_offset);
+ bytes.put(&data[write_offset..]);
+ let write_res = us.writer.as_mut().unwrap().start_send(bytes.freeze());
+ match write_res {
+ Ok(res) => {
+ match res {
+ AsyncSink::Ready => {
+ data.len() - write_offset
+ },
+ AsyncSink::NotReady(_) => {
+ us.read_paused = true;
+ let us_ref = self.clone();
+ tokio::spawn(us.writer.take().unwrap().flush().then(move |writer_res| -> Result<(), ()> {
+ if let Ok(writer) = writer_res {
+ {
+ let mut us = us_ref.conn.lock().unwrap();
+ us.writer = Some(writer);
+ }
+ schedule_read!(us_ref);
+ } // we'll fire the disconnect event on the socket reader end
+ Ok(())
+ }));
+ 0
+ }
+ }
+ },
+ Err(_) => {
+ // We'll fire the disconnected event on the socket reader end
+ 0
+ },
+ }
+ }
+
+ fn disconnect_socket(&mut self) {
+ let mut us = self.conn.lock().unwrap();
+ us.need_disconnect = true;
+ us.read_paused = true;
+ }
+}
+impl Eq for SocketDescriptor {}
+impl PartialEq for SocketDescriptor {
+ fn eq(&self, o: &Self) -> bool {
+ self.id == o.id
+ }
+}
+impl Hash for SocketDescriptor {
+ fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+ self.id.hash(state);
+ }
+}
+
projects / rust-lightning / commitdiff