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255 lines
8.5 KiB
Rust
255 lines
8.5 KiB
Rust
use crate::{
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network::{request_response::AliceToBob, transport::SwapTransport, TokioExecutor},
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protocol::{
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alice,
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alice::{Behaviour, OutEvent, SwapResponse},
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bob,
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},
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};
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use anyhow::{anyhow, Context, Result};
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use futures::FutureExt;
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use libp2p::{
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core::Multiaddr, futures::StreamExt, request_response::ResponseChannel, PeerId, Swarm,
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};
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use tokio::sync::mpsc::{Receiver, Sender};
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#[allow(missing_debug_implementations)]
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pub struct Channels<T> {
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sender: Sender<T>,
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receiver: Receiver<T>,
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}
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impl<T> Channels<T> {
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pub fn new() -> Channels<T> {
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let (sender, receiver) = tokio::sync::mpsc::channel(100);
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Channels { sender, receiver }
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}
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}
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impl<T> Default for Channels<T> {
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fn default() -> Self {
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Self::new()
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}
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}
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#[derive(Debug)]
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pub struct EventLoopHandle {
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msg0: Receiver<(bob::Message0, ResponseChannel<AliceToBob>)>,
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msg1: Receiver<(bob::Message1, ResponseChannel<AliceToBob>)>,
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msg2: Receiver<(bob::Message2, ResponseChannel<AliceToBob>)>,
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msg3: Receiver<bob::Message3>,
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request: Receiver<crate::protocol::alice::swap_response::OutEvent>,
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conn_established: Receiver<PeerId>,
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send_swap_response: Sender<(ResponseChannel<AliceToBob>, SwapResponse)>,
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send_msg0: Sender<(ResponseChannel<AliceToBob>, alice::Message0)>,
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send_msg1: Sender<(ResponseChannel<AliceToBob>, alice::Message1)>,
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send_msg2: Sender<(ResponseChannel<AliceToBob>, alice::Message2)>,
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}
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impl EventLoopHandle {
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pub async fn recv_conn_established(&mut self) -> Result<PeerId> {
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self.conn_established
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed to receive connection established from Bob"))
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}
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pub async fn recv_message0(&mut self) -> Result<(bob::Message0, ResponseChannel<AliceToBob>)> {
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self.msg0
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed to receive message 0 from Bob"))
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}
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pub async fn recv_message1(&mut self) -> Result<(bob::Message1, ResponseChannel<AliceToBob>)> {
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self.msg1
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed to receive message 1 from Bob"))
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}
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pub async fn recv_message2(&mut self) -> Result<(bob::Message2, ResponseChannel<AliceToBob>)> {
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self.msg2
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed o receive message 2 from Bob"))
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}
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pub async fn recv_message3(&mut self) -> Result<bob::Message3> {
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self.msg3
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed to receive Bitcoin encrypted signature from Bob"))
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}
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pub async fn recv_request(
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&mut self,
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) -> Result<crate::protocol::alice::swap_response::OutEvent> {
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self.request
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.recv()
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.await
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.ok_or_else(|| anyhow!("Failed to receive amounts request from Bob"))
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}
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pub async fn send_swap_response(
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&mut self,
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channel: ResponseChannel<AliceToBob>,
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swap_response: SwapResponse,
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) -> Result<()> {
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let _ = self
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.send_swap_response
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.send((channel, swap_response))
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.await?;
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Ok(())
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}
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pub async fn send_message0(
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&mut self,
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channel: ResponseChannel<AliceToBob>,
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msg: alice::Message0,
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) -> Result<()> {
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let _ = self.send_msg0.send((channel, msg)).await?;
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Ok(())
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}
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pub async fn send_message1(
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&mut self,
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channel: ResponseChannel<AliceToBob>,
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msg: alice::Message1,
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) -> Result<()> {
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let _ = self.send_msg1.send((channel, msg)).await?;
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Ok(())
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}
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pub async fn send_message2(
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&mut self,
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channel: ResponseChannel<AliceToBob>,
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msg: alice::Message2,
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) -> Result<()> {
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let _ = self.send_msg2.send((channel, msg)).await?;
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Ok(())
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}
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}
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#[allow(missing_debug_implementations)]
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pub struct EventLoop {
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swarm: libp2p::Swarm<Behaviour>,
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msg0: Sender<(bob::Message0, ResponseChannel<AliceToBob>)>,
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msg1: Sender<(bob::Message1, ResponseChannel<AliceToBob>)>,
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msg2: Sender<(bob::Message2, ResponseChannel<AliceToBob>)>,
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msg3: Sender<bob::Message3>,
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request: Sender<crate::protocol::alice::swap_response::OutEvent>,
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conn_established: Sender<PeerId>,
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send_swap_response: Receiver<(ResponseChannel<AliceToBob>, SwapResponse)>,
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send_msg0: Receiver<(ResponseChannel<AliceToBob>, alice::Message0)>,
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send_msg1: Receiver<(ResponseChannel<AliceToBob>, alice::Message1)>,
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send_msg2: Receiver<(ResponseChannel<AliceToBob>, alice::Message2)>,
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}
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impl EventLoop {
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pub fn new(
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transport: SwapTransport,
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behaviour: Behaviour,
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listen: Multiaddr,
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peer_id: PeerId,
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) -> Result<(Self, EventLoopHandle)> {
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let mut swarm = libp2p::swarm::SwarmBuilder::new(transport, behaviour, peer_id)
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.executor(Box::new(TokioExecutor {
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handle: tokio::runtime::Handle::current(),
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}))
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.build();
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Swarm::listen_on(&mut swarm, listen.clone())
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.with_context(|| format!("Address is not supported: {:#}", listen))?;
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let msg0 = Channels::new();
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let msg1 = Channels::new();
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let msg2 = Channels::new();
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let msg3 = Channels::new();
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let request = Channels::new();
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let conn_established = Channels::new();
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let send_swap_response = Channels::new();
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let send_msg0 = Channels::new();
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let send_msg1 = Channels::new();
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let send_msg2 = Channels::new();
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let driver = EventLoop {
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swarm,
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msg0: msg0.sender,
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msg1: msg1.sender,
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msg2: msg2.sender,
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msg3: msg3.sender,
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request: request.sender,
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conn_established: conn_established.sender,
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send_swap_response: send_swap_response.receiver,
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send_msg0: send_msg0.receiver,
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send_msg1: send_msg1.receiver,
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send_msg2: send_msg2.receiver,
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};
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let handle = EventLoopHandle {
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msg0: msg0.receiver,
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msg1: msg1.receiver,
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msg2: msg2.receiver,
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msg3: msg3.receiver,
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request: request.receiver,
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conn_established: conn_established.receiver,
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send_swap_response: send_swap_response.sender,
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send_msg0: send_msg0.sender,
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send_msg1: send_msg1.sender,
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send_msg2: send_msg2.sender,
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};
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Ok((driver, handle))
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}
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pub async fn run(&mut self) {
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loop {
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tokio::select! {
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swarm_event = self.swarm.next().fuse() => {
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match swarm_event {
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OutEvent::ConnectionEstablished(alice) => {
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let _ = self.conn_established.send(alice).await;
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}
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OutEvent::Message0 { msg, channel } => {
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let _ = self.msg0.send((*msg, channel)).await;
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}
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OutEvent::Message1 { msg, channel } => {
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let _ = self.msg1.send((msg, channel)).await;
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}
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OutEvent::Message2 { msg, channel } => {
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let _ = self.msg2.send((msg, channel)).await;
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}
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OutEvent::Message3(msg) => {
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let _ = self.msg3.send(msg).await;
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}
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OutEvent::Request(event) => {
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let _ = self.request.send(*event).await;
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}
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}
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},
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swap_response = self.send_swap_response.next().fuse() => {
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if let Some((channel, swap_response)) = swap_response {
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self.swarm.send_swap_response(channel, swap_response);
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}
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},
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msg0 = self.send_msg0.next().fuse() => {
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if let Some((channel, msg)) = msg0 {
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self.swarm.send_message0(channel, msg);
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}
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},
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msg1 = self.send_msg1.next().fuse() => {
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if let Some((channel, msg)) = msg1 {
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self.swarm.send_message1(channel, msg);
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}
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},
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msg2 = self.send_msg2.next().fuse() => {
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if let Some((channel, msg)) = msg2 {
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self.swarm.send_message2(channel, msg);
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}
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},
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}
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}
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}
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}
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