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b/Cargo.toml new file mode 100644 index 0000000..3b564a7 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "sdk_relay" +version = "0.1.0" +edition = "2021" + +[dependencies] +bitcoincore-zmq = "1.4.0" +env_logger = "0.9" +futures-util = { version = "0.3.28", default-features = false, features = ["sink", "std"] } +log = "0.4.20" +serde = { version = "1.0.193", features = ["derive"]} +serde_json = "1.0" +tokio = { version = "1.0.0", features = ["io-util", "rt-multi-thread", "macros", "sync"] } +tokio-stream = "0.1" +tokio-tungstenite = "0.21.0" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..0303cb1 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,138 @@ +use std::{ + collections::HashMap, + env, + io::Error as IoError, + net::SocketAddr, + sync::{Arc, Mutex}, +}; + +use futures_util::{future, pin_mut, stream::TryStreamExt, FutureExt, StreamExt}; + +use log::{debug, error}; +use tokio::net::{TcpListener, TcpStream}; +use tokio::sync::mpsc::{unbounded_channel, UnboundedSender}; +use tokio_stream::wrappers::UnboundedReceiverStream; +use tokio_tungstenite::tungstenite::Message; + +type Tx = UnboundedSender; + +type PeerMap = Arc>>; + +// #[derive(Deserialize, Serialize, Debug)] +// struct AnkMessage { +// dest: SilentPaymentId, +// payload: String +// } + +// impl TryFrom for AnkMessage { +// type Error = serde_json::Error; + +// fn try_from(value: Message) -> Result { +// match value { +// Message::Text(s) => serde_json::from_str(&s), +// _ => Err(serde_json::Error::custom("Unsupported message type")), +// } +// } +// } + +async fn handle_connection(peer_map: PeerMap, raw_stream: TcpStream, addr: SocketAddr) { + debug!("Incoming TCP connection from: {}", addr); + + let ws_stream = tokio_tungstenite::accept_async(raw_stream) + .await + .expect("Error during the websocket handshake occurred"); + debug!("WebSocket connection established"); + + // Insert the write part of this peer to the peer map. + let (tx, rx) = unbounded_channel(); + peer_map.lock().unwrap().insert(addr, tx); + + let (outgoing, incoming) = ws_stream.split(); + + let broadcast_incoming = incoming.try_for_each({ + let peer_map = peer_map.clone(); + move |msg| { + let peers = peer_map.lock().unwrap(); + + // Broadcast message to other peers + peers + .iter() + .filter(|(peer_addr, _)| peer_addr != &&addr) + .for_each(|(_, peer_tx)| { + let _ = peer_tx.send(msg.clone()); + }); + + future::ok(()) + } + }); + + let receive_from_others = UnboundedReceiverStream::new(rx) + .map(Ok) + .forward(outgoing) + .map(|result| { + if let Err(e) = result { + debug!("Error sending message: {}", e); + } + }); + + pin_mut!(broadcast_incoming, receive_from_others); + future::select(broadcast_incoming, receive_from_others).await; + + debug!("{} disconnected", &addr); + peer_map.lock().unwrap().remove(&addr); +} + +async fn handle_zmq(peer_map: PeerMap) { + tokio::task::spawn_blocking(move || { + debug!("Starting listening on Core"); + for msg in bitcoincore_zmq::subscribe_receiver(&["tcp://127.0.0.1:29000"]).unwrap() { + match msg { + Ok(core_msg) => { + debug!("Received a {} message", core_msg.topic_str()); + let peers = peer_map.lock().unwrap(); + + let vectors = core_msg.serialize_to_vecs(); + + let mut payload: Vec = Vec::with_capacity(vectors[0].len() + vectors[1].len() + vectors[2].len()); + for v in vectors { + payload.extend(v); + } + + for tx in peers.values() { + let _ = tx.send(Message::Binary(payload.clone())); + } + } + Err(e) => { + error!("Error receiving ZMQ message: {}", e); + continue; + } + } + } + }); +} + +#[tokio::main(flavor = "multi_thread")] +async fn main() -> Result<(), IoError> { + env_logger::init(); + + let addr = env::args() + .nth(1) + .unwrap_or_else(|| "127.0.0.1:8080".to_string()); + + let state = PeerMap::new(Mutex::new(HashMap::new())); + + // Subscribe to Bitcoin Core + tokio::spawn(handle_zmq(state.clone())); + + // Create the event loop and TCP listener we'll accept connections on. + let try_socket = TcpListener::bind(&addr).await; + let listener = try_socket.expect("Failed to bind"); + debug!("Listening on: {}", addr); + + // Let's spawn the handling of each connection in a separate task. + while let Ok((stream, addr)) = listener.accept().await { + tokio::spawn(handle_connection(state.clone(), stream, addr)); + } + + Ok(()) +}