mirror of
https://github.com/comit-network/xmr-btc-swap.git
synced 2024-07-01 00:51:23 +00:00
![Franck Royer](/assets/img/avatar_default.png)
As for Alice, the event loop will be started with the program and will be the one starting swaps (`run_until`) based on libp2p events (swap request).
297 lines
8.5 KiB
Rust
297 lines
8.5 KiB
Rust
//! Run an XMR/BTC swap in the role of Alice.
|
|
//! Alice holds XMR and wishes receive BTC.
|
|
use crate::{
|
|
bitcoin, database,
|
|
database::Database,
|
|
execution_params::ExecutionParams,
|
|
monero,
|
|
network::{
|
|
peer_tracker::{self, PeerTracker},
|
|
Seed as NetworkSeed,
|
|
},
|
|
protocol::{bob::EncryptedSignature, SwapAmounts},
|
|
seed::Seed,
|
|
};
|
|
use anyhow::{bail, Error, Result};
|
|
use libp2p::{
|
|
core::Multiaddr, identity::Keypair, request_response::ResponseChannel, NetworkBehaviour, PeerId,
|
|
};
|
|
use rand::rngs::OsRng;
|
|
use std::sync::Arc;
|
|
use tracing::{debug, info};
|
|
use uuid::Uuid;
|
|
|
|
pub use self::{
|
|
event_loop::{EventLoop, EventLoopHandle},
|
|
execution_setup::Message1,
|
|
state::*,
|
|
swap::{run, run_until},
|
|
swap_response::*,
|
|
transfer_proof::TransferProof,
|
|
};
|
|
use crate::protocol::bob::SwapRequest;
|
|
pub use execution_setup::Message3;
|
|
|
|
mod encrypted_signature;
|
|
pub mod event_loop;
|
|
mod execution_setup;
|
|
pub mod state;
|
|
mod steps;
|
|
pub mod swap;
|
|
mod swap_response;
|
|
mod transfer_proof;
|
|
|
|
pub struct Swap {
|
|
pub state: AliceState,
|
|
pub event_loop_handle: EventLoopHandle,
|
|
pub bitcoin_wallet: Arc<bitcoin::Wallet>,
|
|
pub monero_wallet: Arc<monero::Wallet>,
|
|
pub execution_params: ExecutionParams,
|
|
pub swap_id: Uuid,
|
|
pub db: Database,
|
|
}
|
|
|
|
pub struct Builder {
|
|
swap_id: Uuid,
|
|
identity: Keypair,
|
|
peer_id: PeerId,
|
|
db: Database,
|
|
execution_params: ExecutionParams,
|
|
|
|
listen_address: Multiaddr,
|
|
|
|
bitcoin_wallet: Arc<bitcoin::Wallet>,
|
|
monero_wallet: Arc<monero::Wallet>,
|
|
|
|
init_params: InitParams,
|
|
}
|
|
|
|
enum InitParams {
|
|
None,
|
|
New { swap_amounts: SwapAmounts },
|
|
}
|
|
|
|
impl Builder {
|
|
pub fn new(
|
|
seed: Seed,
|
|
execution_params: ExecutionParams,
|
|
swap_id: Uuid,
|
|
bitcoin_wallet: Arc<bitcoin::Wallet>,
|
|
monero_wallet: Arc<monero::Wallet>,
|
|
db: Database,
|
|
listen_address: Multiaddr,
|
|
) -> Self {
|
|
let network_seed = NetworkSeed::new(seed);
|
|
let identity = network_seed.derive_libp2p_identity();
|
|
let peer_id = PeerId::from(identity.public());
|
|
|
|
Self {
|
|
swap_id,
|
|
identity,
|
|
peer_id,
|
|
db,
|
|
execution_params,
|
|
listen_address,
|
|
bitcoin_wallet,
|
|
monero_wallet,
|
|
init_params: InitParams::None,
|
|
}
|
|
}
|
|
|
|
pub fn with_init_params(self, swap_amounts: SwapAmounts) -> Self {
|
|
Self {
|
|
init_params: InitParams::New { swap_amounts },
|
|
..self
|
|
}
|
|
}
|
|
|
|
pub async fn build(self) -> Result<(Swap, EventLoop)> {
|
|
match self.init_params {
|
|
InitParams::New { swap_amounts } => {
|
|
let initial_state = self
|
|
.make_initial_state(swap_amounts.btc, swap_amounts.xmr)
|
|
.await?;
|
|
|
|
let (event_loop, event_loop_handle) =
|
|
EventLoop::new(self.identity.clone(), self.listen_address(), self.peer_id)?;
|
|
|
|
Ok((
|
|
Swap {
|
|
event_loop_handle,
|
|
bitcoin_wallet: self.bitcoin_wallet,
|
|
monero_wallet: self.monero_wallet,
|
|
execution_params: self.execution_params,
|
|
db: self.db,
|
|
state: initial_state,
|
|
swap_id: self.swap_id,
|
|
},
|
|
event_loop,
|
|
))
|
|
}
|
|
InitParams::None => {
|
|
let resume_state =
|
|
if let database::Swap::Alice(state) = self.db.get_state(self.swap_id)? {
|
|
state.into()
|
|
} else {
|
|
bail!(
|
|
"Trying to load swap with id {} for the wrong direction.",
|
|
self.swap_id
|
|
)
|
|
};
|
|
|
|
let (event_loop, event_loop_handle) =
|
|
EventLoop::new(self.identity.clone(), self.listen_address(), self.peer_id)?;
|
|
|
|
Ok((
|
|
Swap {
|
|
state: resume_state,
|
|
event_loop_handle,
|
|
bitcoin_wallet: self.bitcoin_wallet,
|
|
monero_wallet: self.monero_wallet,
|
|
execution_params: self.execution_params,
|
|
swap_id: self.swap_id,
|
|
db: self.db,
|
|
},
|
|
event_loop,
|
|
))
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn peer_id(&self) -> PeerId {
|
|
self.peer_id
|
|
}
|
|
|
|
pub fn listen_address(&self) -> Multiaddr {
|
|
self.listen_address.clone()
|
|
}
|
|
|
|
async fn make_initial_state(
|
|
&self,
|
|
btc_to_swap: bitcoin::Amount,
|
|
xmr_to_swap: monero::Amount,
|
|
) -> Result<AliceState> {
|
|
let amounts = SwapAmounts {
|
|
btc: btc_to_swap,
|
|
xmr: xmr_to_swap,
|
|
};
|
|
|
|
let state0 = State0::new(
|
|
amounts.btc,
|
|
amounts.xmr,
|
|
self.execution_params,
|
|
self.bitcoin_wallet.as_ref(),
|
|
&mut OsRng,
|
|
)
|
|
.await?;
|
|
|
|
Ok(AliceState::Started { amounts, state0 })
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub enum OutEvent {
|
|
ConnectionEstablished(PeerId),
|
|
SwapRequest {
|
|
msg: SwapRequest,
|
|
channel: ResponseChannel<SwapResponse>,
|
|
},
|
|
ExecutionSetupDone(Result<Box<State3>>),
|
|
TransferProofAcknowledged,
|
|
EncryptedSignature {
|
|
msg: Box<EncryptedSignature>,
|
|
channel: ResponseChannel<()>,
|
|
},
|
|
ResponseSent, // Same variant is used for all messages as no processing is done
|
|
Failure(Error),
|
|
}
|
|
|
|
impl From<peer_tracker::OutEvent> for OutEvent {
|
|
fn from(event: peer_tracker::OutEvent) -> Self {
|
|
match event {
|
|
peer_tracker::OutEvent::ConnectionEstablished(id) => {
|
|
OutEvent::ConnectionEstablished(id)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<swap_response::OutEvent> for OutEvent {
|
|
fn from(event: swap_response::OutEvent) -> Self {
|
|
use swap_response::OutEvent::*;
|
|
match event {
|
|
MsgReceived { msg, channel } => OutEvent::SwapRequest { msg, channel },
|
|
ResponseSent => OutEvent::ResponseSent,
|
|
Failure(err) => OutEvent::Failure(err.context("Swap Request/Response failure")),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<execution_setup::OutEvent> for OutEvent {
|
|
fn from(event: execution_setup::OutEvent) -> Self {
|
|
match event {
|
|
execution_setup::OutEvent::Done(res) => OutEvent::ExecutionSetupDone(res.map(Box::new)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<transfer_proof::OutEvent> for OutEvent {
|
|
fn from(event: transfer_proof::OutEvent) -> Self {
|
|
use transfer_proof::OutEvent::*;
|
|
match event {
|
|
Acknowledged => OutEvent::TransferProofAcknowledged,
|
|
Failure(err) => OutEvent::Failure(err.context("Failure with Transfer Proof")),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<encrypted_signature::OutEvent> for OutEvent {
|
|
fn from(event: encrypted_signature::OutEvent) -> Self {
|
|
use encrypted_signature::OutEvent::*;
|
|
match event {
|
|
MsgReceived { msg, channel } => OutEvent::EncryptedSignature {
|
|
msg: Box::new(msg),
|
|
channel,
|
|
},
|
|
AckSent => OutEvent::ResponseSent,
|
|
Failure(err) => OutEvent::Failure(err.context("Failure with Encrypted Signature")),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A `NetworkBehaviour` that represents an XMR/BTC swap node as Alice.
|
|
#[derive(NetworkBehaviour, Default)]
|
|
#[behaviour(out_event = "OutEvent", event_process = false)]
|
|
#[allow(missing_debug_implementations)]
|
|
pub struct Behaviour {
|
|
pt: PeerTracker,
|
|
amounts: swap_response::Behaviour,
|
|
execution_setup: execution_setup::Behaviour,
|
|
transfer_proof: transfer_proof::Behaviour,
|
|
encrypted_signature: encrypted_signature::Behaviour,
|
|
}
|
|
|
|
impl Behaviour {
|
|
/// Alice always sends her messages as a response to a request from Bob.
|
|
pub fn send_swap_response(
|
|
&mut self,
|
|
channel: ResponseChannel<SwapResponse>,
|
|
swap_response: SwapResponse,
|
|
) -> Result<()> {
|
|
self.amounts.send(channel, swap_response)?;
|
|
info!("Sent swap response");
|
|
Ok(())
|
|
}
|
|
|
|
pub fn start_execution_setup(&mut self, bob_peer_id: PeerId, state0: State0) {
|
|
self.execution_setup.run(bob_peer_id, state0);
|
|
info!("Start execution setup with {}", bob_peer_id);
|
|
}
|
|
|
|
/// Send Transfer Proof to Bob.
|
|
pub fn send_transfer_proof(&mut self, bob: PeerId, msg: TransferProof) {
|
|
self.transfer_proof.send(bob, msg);
|
|
debug!("Sent Transfer Proof");
|
|
}
|
|
}
|