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80 lines
2.8 KiB
Rust
80 lines
2.8 KiB
Rust
use crate::network::cbor_request_response::BUF_SIZE;
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use crate::protocol::alice::{State0, State3};
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use crate::protocol::{Message0, Message2, Message4};
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use anyhow::{Context, Error};
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use libp2p::PeerId;
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use libp2p_async_await::BehaviourOutEvent;
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#[derive(Debug)]
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pub enum OutEvent {
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Done { bob_peer_id: PeerId, state3: State3 },
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Failure { peer: PeerId, error: Error },
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}
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impl From<BehaviourOutEvent<(PeerId, State3), (), Error>> for OutEvent {
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fn from(event: BehaviourOutEvent<(PeerId, State3), (), Error>) -> Self {
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match event {
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BehaviourOutEvent::Inbound(_, Ok((bob_peer_id, state3))) => OutEvent::Done {
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bob_peer_id,
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state3,
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},
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BehaviourOutEvent::Inbound(peer, Err(e)) => OutEvent::Failure { peer, error: e },
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BehaviourOutEvent::Outbound(..) => unreachable!("Alice only supports inbound"),
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}
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}
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}
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#[derive(libp2p::NetworkBehaviour)]
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#[behaviour(out_event = "OutEvent", event_process = false)]
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pub struct Behaviour {
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inner: libp2p_async_await::Behaviour<(PeerId, State3), (), anyhow::Error>,
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}
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impl Default for Behaviour {
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fn default() -> Self {
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Self {
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inner: libp2p_async_await::Behaviour::new(b"/comit/xmr/btc/execution_setup/1.0.0"),
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}
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}
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}
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impl Behaviour {
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pub fn run(&mut self, bob: PeerId, state0: State0) {
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self.inner
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.do_protocol_listener(bob, move |mut substream| async move {
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let message0 =
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serde_cbor::from_slice::<Message0>(&substream.read_message(BUF_SIZE).await?)
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.context("Failed to deserialize message0")?;
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let state1 = state0.receive(message0)?;
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substream
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.write_message(
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&serde_cbor::to_vec(&state1.next_message())
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.context("Failed to serialize message1")?,
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)
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.await?;
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let message2 =
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serde_cbor::from_slice::<Message2>(&substream.read_message(BUF_SIZE).await?)
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.context("Failed to deserialize message2")?;
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let state2 = state1
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.receive(message2)
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.context("Failed to receive Message2")?;
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substream
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.write_message(
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&serde_cbor::to_vec(&state2.next_message())
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.context("Failed to serialize message3")?,
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)
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.await?;
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let message4 =
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serde_cbor::from_slice::<Message4>(&substream.read_message(BUF_SIZE).await?)
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.context("Failed to deserialize message4")?;
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let state3 = state2.receive(message4)?;
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Ok((bob, state3))
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})
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}
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}
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