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181 lines
4.6 KiB
Rust
181 lines
4.6 KiB
Rust
use crate::monero;
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use async_trait::async_trait;
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use futures::prelude::*;
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use libp2p::{
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core::upgrade,
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request_response::{ProtocolName, RequestResponseCodec},
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};
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use serde::{Deserialize, Serialize};
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use std::{fmt::Debug, io, marker::PhantomData};
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use tracing::debug;
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use crate::{
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protocol::{alice, bob},
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SwapAmounts,
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};
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/// Time to wait for a response back once we send a request.
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pub const TIMEOUT: u64 = 3600; // One hour.
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/// Message receive buffer.
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const BUF_SIZE: usize = 1024 * 1024;
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// TODO: Think about whether there is a better way to do this, e.g., separate
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// Codec for each Message and a macro that implements them.
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/// Messages Bob sends to Alice.
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#[derive(Clone, Debug, Serialize, Deserialize)]
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pub enum BobToAlice {
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#[serde(with = "::bitcoin::util::amount::serde::as_sat")]
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AmountsFromBtc(::bitcoin::Amount),
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AmountsFromXmr(monero::Amount),
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Message0(Box<bob::Message0>),
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Message1(bob::Message1),
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Message2(bob::Message2),
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Message3(bob::Message3),
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}
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/// Messages Alice sends to Bob.
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#[derive(Clone, Debug, Serialize, Deserialize)]
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pub enum AliceToBob {
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Amounts(SwapAmounts),
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Message0(Box<alice::Message0>),
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Message1(Box<alice::Message1>),
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Message2(alice::Message2),
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Message3, // empty response
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}
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#[derive(Debug, Clone, Copy, Default)]
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pub struct AmountsProtocol;
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Message0Protocol;
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Message1Protocol;
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Message2Protocol;
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#[derive(Debug, Clone, Copy, Default)]
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pub struct Message3Protocol;
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impl ProtocolName for AmountsProtocol {
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fn protocol_name(&self) -> &[u8] {
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b"/xmr/btc/amounts/1.0.0"
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}
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}
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impl ProtocolName for Message0Protocol {
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fn protocol_name(&self) -> &[u8] {
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b"/xmr/btc/message0/1.0.0"
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}
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}
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impl ProtocolName for Message1Protocol {
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fn protocol_name(&self) -> &[u8] {
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b"/xmr/btc/message1/1.0.0"
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}
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}
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impl ProtocolName for Message2Protocol {
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fn protocol_name(&self) -> &[u8] {
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b"/xmr/btc/message2/1.0.0"
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}
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}
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impl ProtocolName for Message3Protocol {
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fn protocol_name(&self) -> &[u8] {
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b"/xmr/btc/message3/1.0.0"
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}
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}
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#[derive(Clone, Copy, Debug, Default)]
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pub struct Codec<P> {
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phantom: PhantomData<P>,
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}
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#[async_trait]
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impl<P> RequestResponseCodec for Codec<P>
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where
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P: Send + Sync + Clone + ProtocolName,
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{
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type Protocol = P;
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type Request = BobToAlice;
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type Response = AliceToBob;
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async fn read_request<T>(&mut self, _: &Self::Protocol, io: &mut T) -> io::Result<Self::Request>
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where
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T: AsyncRead + Unpin + Send,
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{
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debug!("enter read_request");
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let message = upgrade::read_one(io, BUF_SIZE)
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.await
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.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
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let mut de = serde_cbor::Deserializer::from_slice(&message);
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let msg = BobToAlice::deserialize(&mut de).map_err(|e| {
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tracing::debug!("serde read_request error: {:?}", e);
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io::Error::new(io::ErrorKind::Other, e)
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})?;
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Ok(msg)
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}
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async fn read_response<T>(
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&mut self,
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_: &Self::Protocol,
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io: &mut T,
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) -> io::Result<Self::Response>
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where
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T: AsyncRead + Unpin + Send,
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{
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debug!("enter read_response");
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let message = upgrade::read_one(io, BUF_SIZE)
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.await
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.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
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let mut de = serde_cbor::Deserializer::from_slice(&message);
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let msg = AliceToBob::deserialize(&mut de).map_err(|e| {
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tracing::debug!("serde read_response error: {:?}", e);
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io::Error::new(io::ErrorKind::InvalidData, e)
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})?;
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Ok(msg)
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}
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async fn write_request<T>(
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&mut self,
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_: &Self::Protocol,
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io: &mut T,
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req: Self::Request,
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) -> io::Result<()>
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where
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T: AsyncWrite + Unpin + Send,
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{
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let bytes =
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serde_cbor::to_vec(&req).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
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upgrade::write_one(io, &bytes).await?;
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Ok(())
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}
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async fn write_response<T>(
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&mut self,
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_: &Self::Protocol,
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io: &mut T,
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res: Self::Response,
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) -> io::Result<()>
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where
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T: AsyncWrite + Unpin + Send,
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{
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debug!("enter write_response");
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let bytes = serde_cbor::to_vec(&res).map_err(|e| {
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tracing::debug!("serde write_reponse error: {:?}", e);
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io::Error::new(io::ErrorKind::InvalidData, e)
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})?;
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upgrade::write_one(io, &bytes).await?;
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Ok(())
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}
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}
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