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Merge #85

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85: Database & Swap Resume r=da-kami a=D4nte

- Introduce Database for Alice and Bob
- Save states in database
- Resume from database (broken for Bob, will create test + fix it in follow-up) PR
- Tests when alice restarts: Both happy and refund path

Co-authored-by: Franck Royer <franck@coblox.tech>
Co-authored-by: rishflab <rishflab@hotmail.com>
Co-authored-by: Daniel Karzel <daniel@comit.network>
This commit is contained in:
bors[bot] 2020-12-15 06:13:47 +00:00 committed by GitHub
commit 6ef6fc894f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
24 changed files with 1758 additions and 1390 deletions
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51
swap/src/alice.rs
View File

@ -17,15 +17,15 @@ use libp2p::{
NetworkBehaviour, PeerId,
};
use tracing::{debug, info};
use xmr_btc::{alice::State0, bob};
use xmr_btc::bob;
mod amounts;
pub mod event_loop;
mod execution;
mod message0;
mod message1;
mod message2;
mod message3;
mod steps;
pub mod swap;
pub type Swarm = libp2p::Swarm<Behaviour>;
@ -60,7 +60,10 @@ pub enum OutEvent {
// TODO (Franck): Change this to get both amounts so parties can verify the amounts are
// expected early on.
Request(amounts::OutEvent), // Not-uniform with Bob on purpose, ready for adding Xmr event.
Message0(bob::Message0),
Message0 {
msg: bob::Message0,
channel: ResponseChannel<AliceToBob>,
},
Message1 {
msg: bob::Message1,
channel: ResponseChannel<AliceToBob>,
@ -91,7 +94,7 @@ impl From<amounts::OutEvent> for OutEvent {
impl From<message0::OutEvent> for OutEvent {
fn from(event: message0::OutEvent) -> Self {
match event {
message0::OutEvent::Msg(msg) => OutEvent::Message0(msg),
message0::OutEvent::Msg { channel, msg } => OutEvent::Message0 { msg, channel },
}
}
}
@ -136,20 +139,6 @@ pub struct Behaviour {
}
impl Behaviour {
pub fn new(state: State0) -> Self {
let identity = Keypair::generate_ed25519();
Self {
pt: PeerTracker::default(),
amounts: Amounts::default(),
message0: Message0::new(state),
message1: Message1::default(),
message2: Message2::default(),
message3: Message3::default(),
identity,
}
}
pub fn identity(&self) -> Keypair {
self.identity.clone()
}
@ -165,6 +154,16 @@ impl Behaviour {
info!("Sent amounts response");
}
/// Send Message0 to Bob in response to receiving his Message0.
pub fn send_message0(
&mut self,
channel: ResponseChannel<AliceToBob>,
msg: xmr_btc::alice::Message0,
) {
self.message0.send(channel, msg);
debug!("Sent Message0");
}
/// Send Message1 to Bob in response to receiving his Message1.
pub fn send_message1(
&mut self,
@ -185,3 +184,19 @@ impl Behaviour {
debug!("Sent Message2");
}
}
impl Default for Behaviour {
fn default() -> Self {
let identity = Keypair::generate_ed25519();
Self {
pt: PeerTracker::default(),
amounts: Amounts::default(),
message0: Message0::default(),
message1: Message1::default(),
message2: Message2::default(),
message3: Message3::default(),
identity,
}
}
}

29
swap/src/alice/event_loop.rs
View File

@ -30,13 +30,14 @@ impl<T> Default for Channels<T> {
}
pub struct EventLoopHandle {
msg0: Receiver<bob::Message0>,
msg0: Receiver<(bob::Message0, ResponseChannel<AliceToBob>)>,
msg1: Receiver<(bob::Message1, ResponseChannel<AliceToBob>)>,
msg2: Receiver<(bob::Message2, ResponseChannel<AliceToBob>)>,
msg3: Receiver<bob::Message3>,
request: Receiver<crate::alice::amounts::OutEvent>,
conn_established: Receiver<PeerId>,
send_amounts: Sender<(ResponseChannel<AliceToBob>, SwapAmounts)>,
send_msg0: Sender<(ResponseChannel<AliceToBob>, alice::Message0)>,
send_msg1: Sender<(ResponseChannel<AliceToBob>, alice::Message1)>,
send_msg2: Sender<(ResponseChannel<AliceToBob>, alice::Message2)>,
}
@ -49,7 +50,7 @@ impl EventLoopHandle {
.ok_or_else(|| anyhow!("Failed to receive connection established from Bob"))
}
pub async fn recv_message0(&mut self) -> Result<bob::Message0> {
pub async fn recv_message0(&mut self) -> Result<(bob::Message0, ResponseChannel<AliceToBob>)> {
self.msg0
.recv()
.await
@ -93,6 +94,15 @@ impl EventLoopHandle {
Ok(())
}
pub async fn send_message0(
&mut self,
channel: ResponseChannel<AliceToBob>,
msg: alice::Message0,
) -> Result<()> {
let _ = self.send_msg0.send((channel, msg)).await?;
Ok(())
}
pub async fn send_message1(
&mut self,
channel: ResponseChannel<AliceToBob>,
@ -114,13 +124,14 @@ impl EventLoopHandle {
pub struct EventLoop {
swarm: libp2p::Swarm<Behaviour>,
msg0: Sender<bob::Message0>,
msg0: Sender<(bob::Message0, ResponseChannel<AliceToBob>)>,
msg1: Sender<(bob::Message1, ResponseChannel<AliceToBob>)>,
msg2: Sender<(bob::Message2, ResponseChannel<AliceToBob>)>,
msg3: Sender<bob::Message3>,
request: Sender<crate::alice::amounts::OutEvent>,
conn_established: Sender<PeerId>,
send_amounts: Receiver<(ResponseChannel<AliceToBob>, SwapAmounts)>,
send_msg0: Receiver<(ResponseChannel<AliceToBob>, alice::Message0)>,
send_msg1: Receiver<(ResponseChannel<AliceToBob>, alice::Message1)>,
send_msg2: Receiver<(ResponseChannel<AliceToBob>, alice::Message2)>,
}
@ -149,6 +160,7 @@ impl EventLoop {
let request = Channels::new();
let conn_established = Channels::new();
let send_amounts = Channels::new();
let send_msg0 = Channels::new();
let send_msg1 = Channels::new();
let send_msg2 = Channels::new();
@ -161,6 +173,7 @@ impl EventLoop {
request: request.sender,
conn_established: conn_established.sender,
send_amounts: send_amounts.receiver,
send_msg0: send_msg0.receiver,
send_msg1: send_msg1.receiver,
send_msg2: send_msg2.receiver,
};
@ -173,6 +186,7 @@ impl EventLoop {
request: request.receiver,
conn_established: conn_established.receiver,
send_amounts: send_amounts.sender,
send_msg0: send_msg0.sender,
send_msg1: send_msg1.sender,
send_msg2: send_msg2.sender,
};
@ -188,8 +202,8 @@ impl EventLoop {
OutEvent::ConnectionEstablished(alice) => {
let _ = self.conn_established.send(alice).await;
}
OutEvent::Message0(msg) => {
let _ = self.msg0.send(msg).await;
OutEvent::Message0 { msg, channel } => {
let _ = self.msg0.send((msg, channel)).await;
}
OutEvent::Message1 { msg, channel } => {
let _ = self.msg1.send((msg, channel)).await;
@ -210,6 +224,11 @@ impl EventLoop {
self.swarm.send_amounts(channel, amounts);
}
},
msg0 = self.send_msg0.next().fuse() => {
if let Some((channel, msg)) = msg0 {
self.swarm.send_message0(channel, msg);
}
},
msg1 = self.send_msg1.next().fuse() => {
if let Some((channel, msg)) = msg1 {
self.swarm.send_message1(channel, msg);

52
swap/src/alice/message0.rs
View File

@ -6,7 +6,6 @@ use libp2p::{
swarm::{NetworkBehaviourAction, NetworkBehaviourEventProcess, PollParameters},
NetworkBehaviour,
};
use rand::rngs::OsRng;
use std::{
collections::VecDeque,
task::{Context, Poll},
@ -15,11 +14,15 @@ use std::{
use tracing::{debug, error};
use crate::network::request_response::{AliceToBob, BobToAlice, Codec, Message0Protocol, TIMEOUT};
use xmr_btc::{alice::State0, bob};
use libp2p::request_response::ResponseChannel;
use xmr_btc::bob;
#[derive(Debug)]
pub enum OutEvent {
Msg(bob::Message0),
Msg {
msg: bob::Message0,
channel: ResponseChannel<AliceToBob>,
},
}
/// A `NetworkBehaviour` that represents send/recv of message 0.
@ -30,12 +33,28 @@ pub struct Message0 {
rr: RequestResponse<Codec<Message0Protocol>>,
#[behaviour(ignore)]
events: VecDeque<OutEvent>,
#[behaviour(ignore)]
state: State0,
}
impl Message0 {
pub fn new(state: State0) -> Self {
pub fn send(&mut self, channel: ResponseChannel<AliceToBob>, msg: xmr_btc::alice::Message0) {
let msg = AliceToBob::Message0(msg);
self.rr.send_response(channel, msg);
}
fn poll(
&mut self,
_: &mut Context<'_>,
_: &mut impl PollParameters,
) -> Poll<NetworkBehaviourAction<RequestProtocol<Codec<Message0Protocol>>, OutEvent>> {
if let Some(event) = self.events.pop_front() {
return Poll::Ready(NetworkBehaviourAction::GenerateEvent(event));
}
Poll::Pending
}
}
impl Default for Message0 {
fn default() -> Self {
let timeout = Duration::from_secs(TIMEOUT);
let mut config = RequestResponseConfig::default();
config.set_request_timeout(timeout);
@ -47,21 +66,8 @@ impl Message0 {
config,
),
events: Default::default(),
state,
}
}
fn poll(
&mut self,
_: &mut Context<'_>,
_: &mut impl PollParameters,
) -> Poll<NetworkBehaviourAction<RequestProtocol<Codec<Message0Protocol>>, OutEvent>> {
if let Some(event) = self.events.pop_front() {
return Poll::Ready(NetworkBehaviourAction::GenerateEvent(event));
}
Poll::Pending
}
}
impl NetworkBehaviourEventProcess<RequestResponseEvent<BobToAlice, AliceToBob>> for Message0 {
@ -76,13 +82,7 @@ impl NetworkBehaviourEventProcess<RequestResponseEvent<BobToAlice, AliceToBob>>
} => {
if let BobToAlice::Message0(msg) = request {
debug!("Received Message0");
// TODO(Franck): Move this business logic out of the network behaviour.
let response = AliceToBob::Message0(self.state.next_message(&mut OsRng));
self.rr.send_response(channel, response);
debug!("Sent Message0");
self.events.push_back(OutEvent::Msg(msg));
self.events.push_back(OutEvent::Msg { msg, channel });
}
}
RequestResponseEvent::Message {

11
swap/src/alice/execution.rs → swap/src/alice/steps.rs
View File

@ -10,6 +10,7 @@ use futures::{
};
use libp2p::request_response::ResponseChannel;
use rand::rngs::OsRng;
use sha2::Sha256;
use std::{sync::Arc, time::Duration};
use tokio::time::timeout;
@ -59,7 +60,13 @@ pub async fn negotiate(
.send_amounts(event.channel, amounts)
.await?;
let bob_message0 = timeout(config.bob_time_to_act, event_loop_handle.recv_message0()).await??;
let (bob_message0, channel) =
timeout(config.bob_time_to_act, event_loop_handle.recv_message0()).await??;
let alice_message0 = state0.next_message(&mut OsRng);
event_loop_handle
.send_message0(channel, alice_message0)
.await?;
let state1 = state0.receive(bob_message0)?;
@ -80,6 +87,8 @@ pub async fn negotiate(
Ok((channel, state3))
}
// TODO(Franck): Use helper functions from xmr-btc instead of re-writing them
// here
pub async fn wait_for_locked_bitcoin<W>(
lock_bitcoin_txid: bitcoin::Txid,
bitcoin_wallet: Arc<W>,

443
swap/src/alice/swap.rs
View File

@ -3,18 +3,22 @@
use crate::{
alice::{
event_loop::EventLoopHandle,
execution::{
steps::{
build_bitcoin_punish_transaction, build_bitcoin_redeem_transaction,
extract_monero_private_key, lock_xmr, negotiate, publish_bitcoin_punish_transaction,
publish_bitcoin_redeem_transaction, publish_cancel_transaction,
wait_for_bitcoin_encrypted_signature, wait_for_bitcoin_refund, wait_for_locked_bitcoin,
},
},
bitcoin,
bitcoin::EncryptedSignature,
network::request_response::AliceToBob,
state,
state::{Alice, Swap},
storage::Database,
SwapAmounts,
};
use anyhow::Result;
use anyhow::{bail, Result};
use async_recursion::async_recursion;
use futures::{
future::{select, Either},
@ -22,8 +26,9 @@ use futures::{
};
use libp2p::request_response::ResponseChannel;
use rand::{CryptoRng, RngCore};
use std::{fmt, sync::Arc};
use std::{convert::TryFrom, fmt, sync::Arc};
use tracing::info;
use uuid::Uuid;
use xmr_btc::{
alice::{State0, State3},
bitcoin::{TransactionBlockHeight, TxCancel, TxRefund, WatchForRawTransaction},
@ -36,8 +41,6 @@ trait Rng: RngCore + CryptoRng + Send {}
impl<T> Rng for T where T: RngCore + CryptoRng + Send {}
// The same data structure is used for swap execution and recovery.
// This allows for a seamless transition from a failed swap to recovery.
#[allow(clippy::large_enum_variant)]
pub enum AliceState {
Started {
@ -45,12 +48,12 @@ pub enum AliceState {
state0: State0,
},
Negotiated {
channel: ResponseChannel<AliceToBob>,
channel: Option<ResponseChannel<AliceToBob>>,
amounts: SwapAmounts,
state3: State3,
},
BtcLocked {
channel: ResponseChannel<AliceToBob>,
channel: Option<ResponseChannel<AliceToBob>>,
amounts: SwapAmounts,
state3: State3,
},
@ -67,8 +70,7 @@ pub enum AliceState {
tx_cancel: TxCancel,
},
BtcRefunded {
tx_refund: TxRefund,
published_refund_tx: ::bitcoin::Transaction,
spend_key: monero::PrivateKey,
state3: State3,
},
BtcPunishable {
@ -76,7 +78,7 @@ pub enum AliceState {
state3: State3,
},
XmrRefunded,
Cancelling {
T1Expired {
state3: State3,
},
Punished,
@ -98,7 +100,113 @@ impl fmt::Display for AliceState {
AliceState::SafelyAborted => write!(f, "safely_aborted"),
AliceState::BtcPunishable { .. } => write!(f, "btc_punishable"),
AliceState::XmrRefunded => write!(f, "xmr_refunded"),
AliceState::Cancelling { .. } => write!(f, "cancelling"),
AliceState::T1Expired { .. } => write!(f, "t1 is expired"),
}
}
}
impl From<&AliceState> for state::Alice {
fn from(alice_state: &AliceState) -> Self {
match alice_state {
AliceState::Negotiated { state3, .. } => Alice::Negotiated(state3.clone()),
AliceState::BtcLocked { state3, .. } => Alice::BtcLocked(state3.clone()),
AliceState::XmrLocked { state3 } => Alice::XmrLocked(state3.clone()),
AliceState::EncSignLearned {
state3,
encrypted_signature,
} => Alice::EncSignLearned {
state: state3.clone(),
encrypted_signature: encrypted_signature.clone(),
},
AliceState::BtcRedeemed => Alice::SwapComplete,
AliceState::BtcCancelled { state3, .. } => Alice::BtcCancelled(state3.clone()),
AliceState::BtcRefunded { .. } => Alice::SwapComplete,
AliceState::BtcPunishable { state3, .. } => Alice::BtcPunishable(state3.clone()),
AliceState::XmrRefunded => Alice::SwapComplete,
AliceState::T1Expired { state3 } => Alice::T1Expired(state3.clone()),
AliceState::Punished => Alice::SwapComplete,
AliceState::SafelyAborted => Alice::SwapComplete,
// TODO: Potentially add support to resume swaps that are not Negotiated
AliceState::Started { .. } => {
panic!("Alice attempted to save swap before being negotiated")
}
}
}
}
impl TryFrom<state::Swap> for AliceState {
type Error = anyhow::Error;
fn try_from(db_state: Swap) -> Result<Self, Self::Error> {
use AliceState::*;
if let Swap::Alice(state) = db_state {
let alice_state = match state {
Alice::Negotiated(state3) => Negotiated {
channel: None,
amounts: SwapAmounts {
btc: state3.btc,
xmr: state3.xmr,
},
state3,
},
Alice::BtcLocked(state3) => BtcLocked {
channel: None,
amounts: SwapAmounts {
btc: state3.btc,
xmr: state3.xmr,
},
state3,
},
Alice::XmrLocked(state3) => XmrLocked { state3 },
Alice::BtcRedeemable { .. } => bail!("BtcRedeemable state is unexpected"),
Alice::EncSignLearned {
state,
encrypted_signature,
} => EncSignLearned {
state3: state,
encrypted_signature,
},
Alice::T1Expired(state3) => AliceState::T1Expired { state3 },
Alice::BtcCancelled(state) => {
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B,
);
BtcCancelled {
state3: state,
tx_cancel,
}
}
Alice::BtcPunishable(state) => {
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B,
);
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &state.refund_address);
BtcPunishable {
tx_refund,
state3: state,
}
}
Alice::BtcRefunded {
state, spend_key, ..
} => BtcRefunded {
spend_key,
state3: state,
},
Alice::SwapComplete => {
// TODO(Franck): Better fine grain
AliceState::SafelyAborted
}
};
Ok(alice_state)
} else {
bail!("Alice swap state expected.")
}
}
}
@ -109,7 +217,9 @@ pub async fn swap(
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
monero_wallet: Arc<crate::monero::Wallet>,
config: Config,
) -> Result<(AliceState, EventLoopHandle)> {
swap_id: Uuid,
db: Database,
) -> Result<AliceState> {
run_until(
state,
is_complete,
@ -117,10 +227,35 @@ pub async fn swap(
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
pub async fn resume_from_database(
event_loop_handle: EventLoopHandle,
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
monero_wallet: Arc<crate::monero::Wallet>,
config: Config,
swap_id: Uuid,
db: Database,
) -> Result<AliceState> {
let db_swap = db.get_state(swap_id)?;
let start_state = AliceState::try_from(db_swap)?;
let state = swap(
start_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await?;
Ok(state)
}
pub fn is_complete(state: &AliceState) -> bool {
matches!(
state,
@ -138,8 +273,16 @@ pub fn is_xmr_locked(state: &AliceState) -> bool {
)
}
pub fn is_encsig_learned(state: &AliceState) -> bool {
matches!(
state,
AliceState::EncSignLearned{..}
)
}
// State machine driver for swap execution
#[async_recursion]
#[allow(clippy::too_many_arguments)]
pub async fn run_until(
state: AliceState,
is_target_state: fn(&AliceState) -> bool,
@ -147,27 +290,37 @@ pub async fn run_until(
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
monero_wallet: Arc<crate::monero::Wallet>,
config: Config,
) -> Result<(AliceState, EventLoopHandle)> {
swap_id: Uuid,
db: Database,
// TODO: Remove EventLoopHandle!
) -> Result<AliceState> {
info!("Current state:{}", state);
if is_target_state(&state) {
Ok((state, event_loop_handle))
Ok(state)
} else {
match state {
AliceState::Started { amounts, state0 } => {
let (channel, state3) =
negotiate(state0, amounts, &mut event_loop_handle, config).await?;
let state = AliceState::Negotiated {
channel: Some(channel),
amounts,
state3,
};
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::Negotiated {
channel,
amounts,
state3,
},
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
@ -176,21 +329,41 @@ pub async fn run_until(
channel,
amounts,
} => {
let _ =
wait_for_locked_bitcoin(state3.tx_lock.txid(), bitcoin_wallet.clone(), config)
let state = match channel {
Some(channel) => {
let _ = wait_for_locked_bitcoin(
state3.tx_lock.txid(),
bitcoin_wallet.clone(),
config,
)
.await?;
AliceState::BtcLocked {
channel: Some(channel),
amounts,
state3,
}
}
None => {
tracing::info!("Cannot resume swap from negotiated state, aborting");
// Alice did not lock Xmr yet
AliceState::SafelyAborted
}
};
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::BtcLocked {
channel,
amounts,
state3,
},
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
@ -199,77 +372,82 @@ pub async fn run_until(
amounts,
state3,
} => {
lock_xmr(
channel,
amounts,
state3.clone(),
&mut event_loop_handle,
monero_wallet.clone(),
)
.await?;
let state = match channel {
Some(channel) => {
lock_xmr(
channel,
amounts,
state3.clone(),
&mut event_loop_handle,
monero_wallet.clone(),
)
.await?;
AliceState::XmrLocked { state3 }
}
None => {
tracing::info!("Cannot resume swap from BTC locked state, aborting");
// Alice did not lock Xmr yet
AliceState::SafelyAborted
}
};
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::XmrLocked { state3 },
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
AliceState::XmrLocked { state3 } => {
// todo: match statement and wait for t1 can probably be expressed more cleanly
match state3.current_epoch(bitcoin_wallet.as_ref()).await? {
let state = match state3.current_epoch(bitcoin_wallet.as_ref()).await? {
Epoch::T0 => {
let wait_for_enc_sig = wait_for_bitcoin_encrypted_signature(
&mut event_loop_handle,
config.monero_max_finality_time,
);
let t1_timeout = state3.wait_for_t1(bitcoin_wallet.as_ref());
let state3_clone = state3.clone();
let t1_timeout = state3_clone.wait_for_t1(bitcoin_wallet.as_ref());
tokio::select! {
_ = t1_timeout => {
run_until(
AliceState::Cancelling { state3 },
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
)
.await
}
enc_sig = wait_for_enc_sig => {
run_until(
AliceState::EncSignLearned {
state3,
encrypted_signature: enc_sig?,
},
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
)
.await
}
pin_mut!(wait_for_enc_sig);
pin_mut!(t1_timeout);
match select(t1_timeout, wait_for_enc_sig).await {
Either::Left(_) => AliceState::T1Expired { state3 },
Either::Right((enc_sig, _)) => AliceState::EncSignLearned {
state3,
encrypted_signature: enc_sig?,
},
}
}
_ => {
run_until(
AliceState::Cancelling { state3 },
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
)
.await
}
}
}
_ => AliceState::T1Expired { state3 },
};
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
state,
is_target_state,
event_loop_handle,
bitcoin_wallet.clone(),
monero_wallet,
config,
swap_id,
db,
)
.await
}
AliceState::EncSignLearned {
state3,
encrypted_signature,
@ -284,13 +462,21 @@ pub async fn run_until(
) {
Ok(tx) => tx,
Err(_) => {
state3.wait_for_t1(bitcoin_wallet.as_ref()).await?;
let state = AliceState::T1Expired { state3 };
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
return run_until(
AliceState::Cancelling { state3 },
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await;
}
@ -306,17 +492,23 @@ pub async fn run_until(
)
.await?;
let state = AliceState::BtcRedeemed;
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::BtcRedeemed,
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
AliceState::Cancelling { state3 } => {
AliceState::T1Expired { state3 } => {
let tx_cancel = publish_cancel_transaction(
state3.tx_lock.clone(),
state3.a.clone(),
@ -327,13 +519,19 @@ pub async fn run_until(
)
.await?;
let state = AliceState::BtcCancelled { state3, tx_cancel };
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::BtcCancelled { state3, tx_cancel },
state,
is_target_state,
event_loop_handle,
bitcoin_wallet,
monero_wallet,
config,
swap_id,
db,
)
.await
}
@ -354,52 +552,60 @@ pub async fn run_until(
// TODO(Franck): Review error handling
match published_refund_tx {
None => {
run_until(
AliceState::BtcPunishable { tx_refund, state3 },
is_target_state,
let state = AliceState::BtcPunishable { tx_refund, state3 };
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
swap(
state,
event_loop_handle,
bitcoin_wallet.clone(),
monero_wallet,
config,
swap_id,
db,
)
.await
}
Some(published_refund_tx) => {
let spend_key = extract_monero_private_key(
published_refund_tx,
tx_refund,
state3.s_a,
state3.a.clone(),
state3.S_b_bitcoin,
)?;
let state = AliceState::BtcRefunded { spend_key, state3 };
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::BtcRefunded {
tx_refund,
published_refund_tx,
state3,
},
state,
is_target_state,
event_loop_handle,
bitcoin_wallet.clone(),
monero_wallet,
config,
swap_id,
db,
)
.await
}
}
}
AliceState::BtcRefunded {
tx_refund,
published_refund_tx,
state3,
} => {
let spend_key = extract_monero_private_key(
published_refund_tx,
tx_refund,
state3.s_a,
state3.a.clone(),
state3.S_b_bitcoin,
)?;
AliceState::BtcRefunded { spend_key, state3 } => {
let view_key = state3.v;
monero_wallet
.create_and_load_wallet_for_output(spend_key, view_key)
.await?;
Ok((AliceState::XmrRefunded, event_loop_handle))
let state = AliceState::XmrRefunded;
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
Ok(state)
}
AliceState::BtcPunishable { tx_refund, state3 } => {
let signed_tx_punish = build_bitcoin_punish_transaction(
@ -425,37 +631,52 @@ pub async fn run_until(
match select(punish_tx_finalised, refund_tx_seen).await {
Either::Left(_) => {
let state = AliceState::Punished;
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::Punished,
state,
is_target_state,
event_loop_handle,
bitcoin_wallet.clone(),
monero_wallet,
config,
swap_id,
db,
)
.await
}
Either::Right((published_refund_tx, _)) => {
let spend_key = extract_monero_private_key(
published_refund_tx,
tx_refund,
state3.s_a,
state3.a.clone(),
state3.S_b_bitcoin,
)?;
let state = AliceState::BtcRefunded { spend_key, state3 };
let db_state = (&state).into();
db.insert_latest_state(swap_id, Swap::Alice(db_state))
.await?;
run_until(
AliceState::BtcRefunded {
tx_refund,
published_refund_tx,
state3,
},
state,
is_target_state,
event_loop_handle,
bitcoin_wallet.clone(),
monero_wallet,
config,
swap_id,
db,
)
.await
}
}
}
AliceState::XmrRefunded => Ok((AliceState::XmrRefunded, event_loop_handle)),
AliceState::BtcRedeemed => Ok((AliceState::BtcRedeemed, event_loop_handle)),
AliceState::Punished => Ok((AliceState::Punished, event_loop_handle)),
AliceState::SafelyAborted => Ok((AliceState::SafelyAborted, event_loop_handle)),
AliceState::XmrRefunded => Ok(AliceState::XmrRefunded),
AliceState::BtcRedeemed => Ok(AliceState::BtcRedeemed),
AliceState::Punished => Ok(AliceState::Punished),
AliceState::SafelyAborted => Ok(AliceState::SafelyAborted),
}
}
}

47
swap/src/bin/swap.rs
View File

@ -19,8 +19,7 @@ use std::sync::Arc;
use structopt::StructOpt;
use swap::{
alice, alice::swap::AliceState, bitcoin, bob, bob::swap::BobState, cli::Options, monero,
network::transport::build, recover::recover, storage::Database, trace::init_tracing,
SwapAmounts,
network::transport::build, storage::Database, trace::init_tracing, SwapAmounts,
};
use tracing::{info, log::LevelFilter};
use uuid::Uuid;
@ -98,11 +97,8 @@ async fn main() -> Result<()> {
);
(
AliceState::Started {
amounts,
state0: state0.clone(),
},
alice::Behaviour::new(state0),
AliceState::Started { amounts, state0 },
alice::Behaviour::default(),
)
};
@ -117,12 +113,20 @@ async fn main() -> Result<()> {
let (mut event_loop, handle) =
alice::event_loop::EventLoop::new(alice_transport, alice_behaviour, listen_addr)?;
let swap_id = Uuid::new_v4();
info!(
"Swap sending {} and receiving {} started with ID {}",
send_monero, receive_bitcoin, swap_id
);
let swap = alice::swap::swap(
alice_state,
handle,
bitcoin_wallet.clone(),
monero_wallet.clone(),
config,
swap_id,
db,
);
let _event_loop = tokio::spawn(async move { event_loop.run().await });
@ -130,7 +134,6 @@ async fn main() -> Result<()> {
}
Options::BuyXmr {
alice_addr,
alice_peer_id,
bitcoind_url,
bitcoin_wallet_name,
monero_wallet_rpc_url,
@ -182,13 +185,18 @@ async fn main() -> Result<()> {
let bob_state = BobState::Started {
state0,
amounts,
peer_id: alice_peer_id,
addr: alice_addr,
};
let (event_loop, handle) =
bob::event_loop::EventLoop::new(bob_transport, bob_behaviour).unwrap();
let swap_id = Uuid::new_v4();
info!(
"Swap sending {} and receiving {} started with ID {}",
send_bitcoin, receive_monero, swap_id
);
let swap = bob::swap::swap(
bob_state,
handle,
@ -196,7 +204,7 @@ async fn main() -> Result<()> {
bitcoin_wallet.clone(),
monero_wallet.clone(),
OsRng,
Uuid::new_v4(),
swap_id,
);
let _event_loop = tokio::spawn(async move { event_loop.run().await });
@ -214,24 +222,7 @@ async fn main() -> Result<()> {
// Print the table to stdout
table.printstd();
}
Options::Recover {
swap_id,
bitcoind_url,
monerod_url,
bitcoin_wallet_name,
} => {
let state = db.get_state(swap_id)?;
let bitcoin_wallet = bitcoin::Wallet::new(
bitcoin_wallet_name.as_ref(),
bitcoind_url,
config.bitcoin_network,
)
.await
.expect("failed to create bitcoin wallet");
let monero_wallet = monero::Wallet::new(monerod_url);
recover(bitcoin_wallet, monero_wallet, state).await?;
}
Options::Resume { .. } => todo!("implement this"),
}
Ok(())

1
swap/src/bob.rs
View File

@ -20,7 +20,6 @@ use xmr_btc::{
mod amounts;
pub mod event_loop;
mod execution;
mod message0;
mod message1;
mod message2;

43
swap/src/bob/execution.rs
View File

@ -1,43 +0,0 @@
use crate::{bob::event_loop::EventLoopHandle, SwapAmounts};
use anyhow::Result;
use libp2p::core::Multiaddr;
use rand::{CryptoRng, RngCore};
use std::sync::Arc;
use xmr_btc::bob::State2;
pub async fn negotiate<R>(
state0: xmr_btc::bob::State0,
amounts: SwapAmounts,
swarm: &mut EventLoopHandle,
addr: Multiaddr,
mut rng: R,
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
) -> Result<State2>
where
R: RngCore + CryptoRng + Send,
{
tracing::trace!("Starting negotiate");
swarm.dial_alice(addr).await?;
let alice = swarm.recv_conn_established().await?;
swarm.request_amounts(alice.clone(), amounts.btc).await?;
swarm
.send_message0(alice.clone(), state0.next_message(&mut rng))
.await?;
let msg0 = swarm.recv_message0().await?;
let state1 = state0.receive(bitcoin_wallet.as_ref(), msg0).await?;
swarm
.send_message1(alice.clone(), state1.next_message())
.await?;
let msg1 = swarm.recv_message1().await?;
let state2 = state1.receive(msg1)?;
swarm
.send_message2(alice.clone(), state2.next_message())
.await?;
Ok(state2)
}

276
swap/src/bob/swap.rs
View File

@ -1,27 +1,31 @@
use crate::{
bob::{event_loop::EventLoopHandle, execution::negotiate},
bob::event_loop::EventLoopHandle,
state,
state::{Bob, Swap},
storage::Database,
SwapAmounts,
};
use anyhow::Result;
use anyhow::{bail, Result};
use async_recursion::async_recursion;
use futures::{
future::{select, Either},
pin_mut,
};
use libp2p::{core::Multiaddr, PeerId};
use rand::{CryptoRng, RngCore};
use std::{fmt, sync::Arc};
use std::{convert::TryFrom, fmt, sync::Arc};
use tracing::info;
use uuid::Uuid;
use xmr_btc::{
bob::{self},
bob::{self, State2},
Epoch,
};
// The same data structure is used for swap execution and recovery.
// This allows for a seamless transition from a failed swap to recovery.
#[derive(Debug, Clone)]
pub enum BobState {
Started {
state0: bob::State0,
amounts: SwapAmounts,
peer_id: PeerId,
addr: Multiaddr,
},
Negotiated(bob::State2, PeerId),
@ -54,6 +58,49 @@ impl fmt::Display for BobState {
}
}
impl From<BobState> for state::Bob {
fn from(bob_state: BobState) -> Self {
match bob_state {
BobState::Started { .. } => {
// TODO: Do we want to resume just started swaps
unimplemented!("Cannot save a swap that has just started")
}
BobState::Negotiated(state2, peer_id) => Bob::Negotiated { state2, peer_id },
BobState::BtcLocked(state3, peer_id) => Bob::BtcLocked { state3, peer_id },
BobState::XmrLocked(state4, peer_id) => Bob::XmrLocked { state4, peer_id },
BobState::EncSigSent(state4, peer_id) => Bob::EncSigSent { state4, peer_id },
BobState::BtcRedeemed(state5) => Bob::BtcRedeemed(state5),
BobState::Cancelled(state4) => Bob::BtcCancelled(state4),
BobState::BtcRefunded(_)
| BobState::XmrRedeemed
| BobState::Punished
| BobState::SafelyAborted => Bob::SwapComplete,
}
}
}
impl TryFrom<state::Swap> for BobState {
type Error = anyhow::Error;
fn try_from(db_state: state::Swap) -> Result<Self, Self::Error> {
if let Swap::Bob(state) = db_state {
let bob_State = match state {
Bob::Negotiated { state2, peer_id } => BobState::Negotiated(state2, peer_id),
Bob::BtcLocked { state3, peer_id } => BobState::BtcLocked(state3, peer_id),
Bob::XmrLocked { state4, peer_id } => BobState::XmrLocked(state4, peer_id),
Bob::EncSigSent { state4, peer_id } => BobState::EncSigSent(state4, peer_id),
Bob::BtcRedeemed(state5) => BobState::BtcRedeemed(state5),
Bob::BtcCancelled(state4) => BobState::Cancelled(state4),
Bob::SwapComplete => BobState::SafelyAborted,
};
Ok(bob_State)
} else {
bail!("Bob swap state expected.")
}
}
}
pub async fn swap<R>(
state: BobState,
event_loop_handle: EventLoopHandle,
@ -79,6 +126,32 @@ where
.await
}
pub async fn resume_from_database<R>(
event_loop_handle: EventLoopHandle,
db: Database,
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
monero_wallet: Arc<crate::monero::Wallet>,
rng: R,
swap_id: Uuid,
) -> Result<BobState>
where
R: RngCore + CryptoRng + Send,
{
let db_swap = db.get_state(swap_id)?;
let start_state = BobState::try_from(db_swap)?;
let state = swap(
start_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await?;
Ok(state)
}
pub fn is_complete(state: &BobState) -> bool {
matches!(
state,
@ -97,6 +170,10 @@ pub fn is_xmr_locked(state: &BobState) -> bool {
matches!(state, BobState::XmrLocked(..))
}
pub fn is_encsig_sent(state: &BobState) -> bool {
matches!(state, BobState::EncSigSent(..))
}
// State machine driver for swap execution
#[allow(clippy::too_many_arguments)]
#[async_recursion]
@ -121,10 +198,9 @@ where
BobState::Started {
state0,
amounts,
peer_id,
addr,
} => {
let state2 = negotiate(
let (state2, alice_peer_id) = negotiate(
state0,
amounts,
&mut event_loop_handle,
@ -133,8 +209,13 @@ where
bitcoin_wallet.clone(),
)
.await?;
let state = BobState::Negotiated(state2, alice_peer_id);
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
BobState::Negotiated(state2, peer_id),
state,
is_target_state,
event_loop_handle,
db,
@ -148,9 +229,13 @@ where
BobState::Negotiated(state2, alice_peer_id) => {
// Alice and Bob have exchanged info
let state3 = state2.lock_btc(bitcoin_wallet.as_ref()).await?;
// db.insert_latest_state(state);
let state = BobState::BtcLocked(state3, alice_peer_id);
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
BobState::BtcLocked(state3, alice_peer_id),
state,
is_target_state,
event_loop_handle,
db,
@ -170,8 +255,12 @@ where
.watch_for_lock_xmr(monero_wallet.as_ref(), msg2)
.await?;
let state = BobState::XmrLocked(state4, alice_peer_id);
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
BobState::XmrLocked(state4, alice_peer_id),
state,
is_target_state,
event_loop_handle,
db,
@ -194,8 +283,12 @@ where
.send_message3(alice_peer_id.clone(), tx_redeem_encsig)
.await?;
let state = BobState::EncSigSent(state, alice_peer_id);
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
BobState::EncSigSent(state, alice_peer_id),
state,
is_target_state,
event_loop_handle,
db,
@ -207,51 +300,55 @@ where
.await
}
BobState::EncSigSent(state, ..) => {
// Watch for redeem
let redeem_watcher = state.watch_for_redeem_btc(bitcoin_wallet.as_ref());
let t1_timeout = state.wait_for_t1(bitcoin_wallet.as_ref());
let state_clone = state.clone();
let redeem_watcher = state_clone.watch_for_redeem_btc(bitcoin_wallet.as_ref());
let t1_timeout = state_clone.wait_for_t1(bitcoin_wallet.as_ref());
tokio::select! {
val = redeem_watcher => {
run_until(
BobState::BtcRedeemed(val?),
is_target_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
_ = t1_timeout => {
pin_mut!(redeem_watcher);
pin_mut!(t1_timeout);
let state = match select(redeem_watcher, t1_timeout).await {
Either::Left((val, _)) => BobState::BtcRedeemed(val?),
Either::Right((..)) => {
// Check whether TxCancel has been published.
// We should not fail if the transaction is already on the blockchain
if state.check_for_tx_cancel(bitcoin_wallet.as_ref()).await.is_err() {
if state
.check_for_tx_cancel(bitcoin_wallet.as_ref())
.await
.is_err()
{
state.submit_tx_cancel(bitcoin_wallet.as_ref()).await?;
}
run_until(
BobState::Cancelled(state),
is_target_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id
)
.await
BobState::Cancelled(state)
}
}
};
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
state,
is_target_state,
event_loop_handle,
db,
bitcoin_wallet.clone(),
monero_wallet,
rng,
swap_id,
)
.await
}
BobState::BtcRedeemed(state) => {
// Bob redeems XMR using revealed s_a
state.claim_xmr(monero_wallet.as_ref()).await?;
let state = BobState::XmrRedeemed;
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
BobState::XmrRedeemed,
state,
is_target_state,
event_loop_handle,
db,
@ -263,37 +360,31 @@ where
.await
}
BobState::Cancelled(state) => {
// TODO
// Bob has cancelled the swap
match state.current_epoch(bitcoin_wallet.as_ref()).await? {
let state = match state.current_epoch(bitcoin_wallet.as_ref()).await? {
Epoch::T0 => panic!("Cancelled before t1??? Something is really wrong"),
Epoch::T1 => {
state.refund_btc(bitcoin_wallet.as_ref()).await?;
run_until(
BobState::BtcRefunded(state),
is_target_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
BobState::BtcRefunded(state)
}
Epoch::T2 => {
run_until(
BobState::Punished,
is_target_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
}
Epoch::T2 => BobState::Punished,
};
let db_state = state.clone().into();
db.insert_latest_state(swap_id, state::Swap::Bob(db_state))
.await?;
run_until(
state,
is_target_state,
event_loop_handle,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
BobState::BtcRefunded(state4) => Ok(BobState::BtcRefunded(state4)),
BobState::Punished => Ok(BobState::Punished),
@ -302,3 +393,42 @@ where
}
}
}
pub async fn negotiate<R>(
state0: xmr_btc::bob::State0,
amounts: SwapAmounts,
swarm: &mut EventLoopHandle,
addr: Multiaddr,
mut rng: R,
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
) -> Result<(State2, PeerId)>
where
R: RngCore + CryptoRng + Send,
{
tracing::trace!("Starting negotiate");
swarm.dial_alice(addr).await?;
let alice_peer_id = swarm.recv_conn_established().await?;
swarm
.request_amounts(alice_peer_id.clone(), amounts.btc)
.await?;
swarm
.send_message0(alice_peer_id.clone(), state0.next_message(&mut rng))
.await?;
let msg0 = swarm.recv_message0().await?;
let state1 = state0.receive(bitcoin_wallet.as_ref(), msg0).await?;
swarm
.send_message1(alice_peer_id.clone(), state1.next_message())
.await?;
let msg1 = swarm.recv_message1().await?;
let state2 = state1.receive(msg1)?;
swarm
.send_message2(alice_peer_id.clone(), state2.next_message())
.await?;
Ok((state2, alice_peer_id))
}

7
swap/src/cli.rs
View File

@ -1,4 +1,4 @@
use libp2p::{core::Multiaddr, PeerId};
use libp2p::core::Multiaddr;
use url::Url;
use uuid::Uuid;
@ -40,9 +40,6 @@ pub enum Options {
#[structopt(short = "a", long = "connect-addr")]
alice_addr: Multiaddr,
#[structopt(short = "p", long = "connect-peer-id")]
alice_peer_id: PeerId,
#[structopt(
short = "b",
long = "bitcoind",
@ -67,7 +64,7 @@ pub enum Options {
receive_monero: xmr_btc::monero::Amount,
},
History,
Recover {
Resume {
#[structopt(required = true)]
swap_id: Uuid,

6
swap/src/lib.rs
View File

@ -1,6 +1,6 @@
#![allow(non_snake_case)]
use serde::{Deserialize, Serialize};
use ::serde::{Deserialize, Serialize};
use std::fmt::{self, Display};
pub mod alice;
@ -9,7 +9,7 @@ pub mod bob;
pub mod cli;
pub mod monero;
pub mod network;
pub mod recover;
pub mod serde;
pub mod state;
pub mod storage;
pub mod tor;
@ -31,7 +31,7 @@ pub enum Rsp {
}
/// XMR/BTC swap amounts.
#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq)]
// TODO(Franck): review necessity of this struct
pub struct SwapAmounts {
/// Amount of BTC to swap.

463
swap/src/recover.rs
View File

@ -1,463 +0,0 @@
//! This module is used to attempt to recover an unfinished swap.
//!
//! Recovery is only supported for certain states and the strategy followed is
//! to perform the simplest steps that require no further action from the
//! counterparty.
//!
//! The quality of this module is bad because there is a lot of code
//! duplication, both within the module and with respect to
//! `xmr_btc/src/{alice,bob}.rs`. In my opinion, a better approach to support
//! swap recovery would be through the `action_generator`s themselves, but this
//! was deemed too complicated for the time being.
use crate::{
bitcoin, monero,
monero::CreateWalletForOutput,
state::{Alice, Bob, Swap},
};
use anyhow::Result;
use bitcoin_harness::BitcoindRpcApi;
use ecdsa_fun::{adaptor::Adaptor, nonce::Deterministic};
use futures::{
future::{select, Either},
pin_mut,
};
use sha2::Sha256;
use tracing::info;
use xmr_btc::bitcoin::{
poll_until_block_height_is_gte, BroadcastSignedTransaction, TransactionBlockHeight,
WatchForRawTransaction,
};
pub async fn recover(
bitcoin_wallet: bitcoin::Wallet,
monero_wallet: monero::Wallet,
state: Swap,
) -> Result<()> {
match state {
Swap::Alice(state) => alice_recover(bitcoin_wallet, monero_wallet, state).await,
Swap::Bob(state) => bob_recover(bitcoin_wallet, monero_wallet, state).await,
}
}
pub async fn alice_recover(
bitcoin_wallet: bitcoin::Wallet,
monero_wallet: monero::Wallet,
state: Alice,
) -> Result<()> {
match state {
Alice::Negotiated(_) | Alice::BtcLocked(_) | Alice::SwapComplete => {
info!("Nothing to do");
}
Alice::XmrLocked(state) => {
info!("Monero still locked up");
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B,
);
info!("Checking if the Bitcoin cancel transaction has been published");
if bitcoin_wallet
.inner
.get_raw_transaction(tx_cancel.txid())
.await
.is_err()
{
info!("Bitcoin cancel transaction not yet published");
let tx_lock_height = bitcoin_wallet
.transaction_block_height(state.tx_lock.txid())
.await;
poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_lock_height + state.refund_timelock,
)
.await;
let sig_a = state.a.sign(tx_cancel.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let tx_cancel = tx_cancel
.clone()
.add_signatures(&state.tx_lock, (state.a.public(), sig_a), (state.B, sig_b))
.expect("sig_{a,b} to be valid signatures for tx_cancel");
// TODO: We should not fail if the transaction is already on the blockchain
bitcoin_wallet
.broadcast_signed_transaction(tx_cancel)
.await?;
}
info!("Confirmed that Bitcoin cancel transaction is on the blockchain");
let tx_cancel_height = bitcoin_wallet
.transaction_block_height(tx_cancel.txid())
.await;
let poll_until_bob_can_be_punished = poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_cancel_height + state.punish_timelock,
);
pin_mut!(poll_until_bob_can_be_punished);
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &state.refund_address);
info!("Waiting for either Bitcoin refund or punish timelock");
match select(
bitcoin_wallet.watch_for_raw_transaction(tx_refund.txid()),
poll_until_bob_can_be_punished,
)
.await
{
Either::Left((tx_refund_published, ..)) => {
info!("Found Bitcoin refund transaction");
let s_a = monero::PrivateKey {
scalar: state.s_a.into_ed25519(),
};
let tx_refund_sig = tx_refund
.extract_signature_by_key(tx_refund_published, state.a.public())?;
let tx_refund_encsig = state.a.encsign(state.S_b_bitcoin, tx_refund.digest());
let s_b = bitcoin::recover(state.S_b_bitcoin, tx_refund_sig, tx_refund_encsig)?;
let s_b = monero::PrivateKey::from_scalar(
monero::Scalar::from_bytes_mod_order(s_b.to_bytes()),
);
monero_wallet
.create_and_load_wallet_for_output(s_a + s_b, state.v)
.await?;
info!("Successfully refunded monero");
}
Either::Right(_) => {
info!("Punish timelock reached, attempting to punish Bob");
let tx_punish = bitcoin::TxPunish::new(
&tx_cancel,
&state.punish_address,
state.punish_timelock,
);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_punish_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B, sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
info!("Successfully punished Bob's inactivity by taking bitcoin");
}
};
}
Alice::BtcRedeemable { redeem_tx, state } => {
info!("Have the means to redeem the Bitcoin");
let tx_lock_height = bitcoin_wallet
.transaction_block_height(state.tx_lock.txid())
.await;
let block_height = bitcoin_wallet.inner.client.getblockcount().await?;
let refund_absolute_expiry = tx_lock_height + state.refund_timelock;
info!("Checking refund timelock");
if block_height < refund_absolute_expiry {
info!("Safe to redeem");
bitcoin_wallet
.broadcast_signed_transaction(redeem_tx)
.await?;
info!("Successfully redeemed bitcoin");
} else {
info!("Refund timelock reached");
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B,
);
info!("Checking if the Bitcoin cancel transaction has been published");
if bitcoin_wallet
.inner
.get_raw_transaction(tx_cancel.txid())
.await
.is_err()
{
let sig_a = state.a.sign(tx_cancel.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let tx_cancel = tx_cancel
.clone()
.add_signatures(&state.tx_lock, (state.a.public(), sig_a), (state.B, sig_b))
.expect("sig_{a,b} to be valid signatures for tx_cancel");
// TODO: We should not fail if the transaction is already on the blockchain
bitcoin_wallet
.broadcast_signed_transaction(tx_cancel)
.await?;
}
info!("Confirmed that Bitcoin cancel transaction is on the blockchain");
let tx_cancel_height = bitcoin_wallet
.transaction_block_height(tx_cancel.txid())
.await;
let poll_until_bob_can_be_punished = poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_cancel_height + state.punish_timelock,
);
pin_mut!(poll_until_bob_can_be_punished);
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &state.refund_address);
info!("Waiting for either Bitcoin refund or punish timelock");
match select(
bitcoin_wallet.watch_for_raw_transaction(tx_refund.txid()),
poll_until_bob_can_be_punished,
)
.await
{
Either::Left((tx_refund_published, ..)) => {
info!("Found Bitcoin refund transaction");
let s_a = monero::PrivateKey {
scalar: state.s_a.into_ed25519(),
};
let tx_refund_sig = tx_refund
.extract_signature_by_key(tx_refund_published, state.a.public())?;
let tx_refund_encsig =
state.a.encsign(state.S_b_bitcoin, tx_refund.digest());
let s_b =
bitcoin::recover(state.S_b_bitcoin, tx_refund_sig, tx_refund_encsig)?;
let s_b = monero::PrivateKey::from_scalar(
monero::Scalar::from_bytes_mod_order(s_b.to_bytes()),
);
monero_wallet
.create_and_load_wallet_for_output(s_a + s_b, state.v)
.await?;
info!("Successfully refunded monero");
}
Either::Right(_) => {
info!("Punish timelock reached, attempting to punish Bob");
let tx_punish = bitcoin::TxPunish::new(
&tx_cancel,
&state.punish_address,
state.punish_timelock,
);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_punish_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B, sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
info!("Successfully punished Bob's inactivity by taking bitcoin");
}
};
}
}
Alice::BtcPunishable(state) => {
info!("Punish timelock reached, attempting to punish Bob");
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.a.public(),
state.B,
);
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &state.refund_address);
info!("Checking if Bitcoin has already been refunded");
// TODO: Protect against transient errors so that we can correctly decide if the
// bitcoin has been refunded
match bitcoin_wallet
.inner
.get_raw_transaction(tx_refund.txid())
.await
{
Ok(tx_refund_published) => {
info!("Bitcoin already refunded");
let s_a = monero::PrivateKey {
scalar: state.s_a.into_ed25519(),
};
let tx_refund_sig = tx_refund
.extract_signature_by_key(tx_refund_published, state.a.public())?;
let tx_refund_encsig = state.a.encsign(state.S_b_bitcoin, tx_refund.digest());
let s_b = bitcoin::recover(state.S_b_bitcoin, tx_refund_sig, tx_refund_encsig)?;
let s_b = monero::PrivateKey::from_scalar(
monero::Scalar::from_bytes_mod_order(s_b.to_bytes()),
);
monero_wallet
.create_and_load_wallet_for_output(s_a + s_b, state.v)
.await?;
info!("Successfully refunded monero");
}
Err(_) => {
info!("Bitcoin not yet refunded");
let tx_punish = bitcoin::TxPunish::new(
&tx_cancel,
&state.punish_address,
state.punish_timelock,
);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_punish_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B, sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
info!("Successfully punished Bob's inactivity by taking bitcoin");
}
}
}
Alice::BtcRefunded {
view_key,
spend_key,
..
} => {
info!("Bitcoin was refunded, attempting to refund monero");
monero_wallet
.create_and_load_wallet_for_output(spend_key, view_key)
.await?;
info!("Successfully refunded monero");
}
};
Ok(())
}
pub async fn bob_recover(
bitcoin_wallet: crate::bitcoin::Wallet,
monero_wallet: crate::monero::Wallet,
state: Bob,
) -> Result<()> {
match state {
Bob::Handshaken(_) | Bob::SwapComplete => {
info!("Nothing to do");
}
Bob::BtcLocked(state) | Bob::XmrLocked(state) | Bob::BtcRefundable(state) => {
info!("Bitcoin may still be locked up, attempting to refund");
let tx_cancel = bitcoin::TxCancel::new(
&state.tx_lock,
state.refund_timelock,
state.A,
state.b.public(),
);
info!("Checking if the Bitcoin cancel transaction has been published");
if bitcoin_wallet
.inner
.get_raw_transaction(tx_cancel.txid())
.await
.is_err()
{
info!("Bitcoin cancel transaction not yet published");
let tx_lock_height = bitcoin_wallet
.transaction_block_height(state.tx_lock.txid())
.await;
poll_until_block_height_is_gte(
&bitcoin_wallet,
tx_lock_height + state.refund_timelock,
)
.await;
let sig_a = state.tx_cancel_sig_a.clone();
let sig_b = state.b.sign(tx_cancel.digest());
let tx_cancel = tx_cancel
.clone()
.add_signatures(&state.tx_lock, (state.A, sig_a), (state.b.public(), sig_b))
.expect("sig_{a,b} to be valid signatures for tx_cancel");
// TODO: We should not fail if the transaction is already on the blockchain
bitcoin_wallet
.broadcast_signed_transaction(tx_cancel)
.await?;
}
info!("Confirmed that Bitcoin cancel transaction is on the blockchain");
let tx_refund = bitcoin::TxRefund::new(&tx_cancel, &state.refund_address);
let signed_tx_refund = {
let adaptor = Adaptor::<Sha256, Deterministic<Sha256>>::default();
let sig_a = adaptor
.decrypt_signature(&state.s_b.into_secp256k1(), state.tx_refund_encsig.clone());
let sig_b = state.b.sign(tx_refund.digest());
tx_refund
.add_signatures(&tx_cancel, (state.A, sig_a), (state.b.public(), sig_b))
.expect("sig_{a,b} to be valid signatures for tx_refund")
};
// TODO: Check if Bitcoin has already been punished and provide a useful error
// message/log to the user if so
bitcoin_wallet
.broadcast_signed_transaction(signed_tx_refund)
.await?;
info!("Successfully refunded bitcoin");
}
Bob::BtcRedeemed(state) => {
info!("Bitcoin was redeemed, attempting to redeem monero");
let tx_redeem = bitcoin::TxRedeem::new(&state.tx_lock, &state.redeem_address);
let tx_redeem_published = bitcoin_wallet
.inner
.get_raw_transaction(tx_redeem.txid())
.await?;
let tx_redeem_encsig = state.b.encsign(state.S_a_bitcoin, tx_redeem.digest());
let tx_redeem_sig =
tx_redeem.extract_signature_by_key(tx_redeem_published, state.b.public())?;
let s_a = bitcoin::recover(state.S_a_bitcoin, tx_redeem_sig, tx_redeem_encsig)?;
let s_a = monero::PrivateKey::from_scalar(monero::Scalar::from_bytes_mod_order(
s_a.to_bytes(),
));
let s_b = monero::PrivateKey {
scalar: state.s_b.into_ed25519(),
};
monero_wallet
.create_and_load_wallet_for_output(s_a + s_b, state.v)
.await?;
info!("Successfully redeemed monero")
}
};
Ok(())
}

47
swap/src/serde.rs Normal file
View File

@ -0,0 +1,47 @@
pub mod peer_id {
use libp2p::PeerId;
use serde::{de::Error, Deserialize, Deserializer, Serializer};
pub fn serialize<S>(peer_id: &PeerId, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let string = peer_id.to_string();
serializer.serialize_str(&string)
}
#[allow(dead_code)]
pub fn deserialize<'de, D>(deserializer: D) -> Result<PeerId, D::Error>
where
D: Deserializer<'de>,
{
let string = String::deserialize(deserializer)?;
let peer_id = string.parse().map_err(D::Error::custom)?;
Ok(peer_id)
}
#[cfg(test)]
mod tests {
use super::*;
use serde::Serialize;
use spectral::prelude::*;
#[derive(Serialize)]
struct SerializablePeerId(#[serde(with = "super")] PeerId);
#[test]
fn maker_id_serializes_as_expected() {
let peer_id = SerializablePeerId(
"QmfUfpC2frwFvcDzpspnfZitHt5wct6n4kpG5jzgRdsxkY"
.parse()
.unwrap(),
);
let got = serde_json::to_string(&peer_id).expect("failed to serialize peer id");
assert_that(&got)
.is_equal_to(r#""QmfUfpC2frwFvcDzpspnfZitHt5wct6n4kpG5jzgRdsxkY""#.to_string());
}
}
}

45
swap/src/state.rs
View File

@ -1,6 +1,7 @@
use libp2p::PeerId;
use serde::{Deserialize, Serialize};
use std::fmt::Display;
use xmr_btc::{alice, bob, monero, serde::monero_private_key};
use xmr_btc::{alice, bitcoin::EncryptedSignature, bob, monero, serde::monero_private_key};
#[allow(clippy::large_enum_variant)]
#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
@ -15,10 +16,17 @@ pub enum Alice {
Negotiated(alice::State3),
BtcLocked(alice::State3),
XmrLocked(alice::State3),
// TODO(Franck): Delete this state as it is not used in alice::swap
BtcRedeemable {
state: alice::State3,
redeem_tx: bitcoin::Transaction,
},
EncSignLearned {
state: alice::State3,
encrypted_signature: EncryptedSignature,
},
T1Expired(alice::State3),
BtcCancelled(alice::State3),
BtcPunishable(alice::State3),
BtcRefunded {
state: alice::State3,
@ -31,11 +39,28 @@ pub enum Alice {
#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
pub enum Bob {
Handshaken(bob::State2),
BtcLocked(bob::State2),
XmrLocked(bob::State2),
BtcRedeemed(bob::State2),
BtcRefundable(bob::State2),
Negotiated {
state2: bob::State2,
#[serde(with = "crate::serde::peer_id")]
peer_id: PeerId,
},
BtcLocked {
state3: bob::State3,
#[serde(with = "crate::serde::peer_id")]
peer_id: PeerId,
},
XmrLocked {
state4: bob::State4,
#[serde(with = "crate::serde::peer_id")]
peer_id: PeerId,
},
EncSigSent {
state4: bob::State4,
#[serde(with = "crate::serde::peer_id")]
peer_id: PeerId,
},
BtcRedeemed(bob::State5),
BtcCancelled(bob::State4),
SwapComplete,
}
@ -67,9 +92,12 @@ impl Display for Alice {
Alice::BtcLocked(_) => f.write_str("Bitcoin locked"),
Alice::XmrLocked(_) => f.write_str("Monero locked"),
Alice::BtcRedeemable { .. } => f.write_str("Bitcoin redeemable"),
Alice::T1Expired(_) => f.write_str("Submitting TxCancel"),
Alice::BtcCancelled(_) => f.write_str("Bitcoin cancel transaction published"),
Alice::BtcPunishable(_) => f.write_str("Bitcoin punishable"),
Alice::BtcRefunded { .. } => f.write_str("Monero refundable"),
Alice::SwapComplete => f.write_str("Swap complete"),
Alice::EncSignLearned { .. } => f.write_str("Encrypted signature learned"),
}
}
}
@ -77,12 +105,13 @@ impl Display for Alice {
impl Display for Bob {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Bob::Handshaken(_) => f.write_str("Handshake complete"),
Bob::BtcLocked(_) | Bob::XmrLocked(_) | Bob::BtcRefundable(_) => {
Bob::Negotiated { .. } => f.write_str("Handshake complete"),
Bob::BtcLocked { .. } | Bob::XmrLocked { .. } | Bob::BtcCancelled(_) => {
f.write_str("Bitcoin refundable")
}
Bob::BtcRedeemed(_) => f.write_str("Monero redeemable"),
Bob::SwapComplete => f.write_str("Swap complete"),
Bob::EncSigSent { .. } => f.write_str("Encrypted signature sent"),
}
}
}

574
swap/tests/e2e.rs
View File

@ -1,574 +0,0 @@
use bitcoin_harness::Bitcoind;
use futures::future::try_join;
use libp2p::{Multiaddr, PeerId};
use monero_harness::Monero;
use rand::rngs::OsRng;
use std::sync::Arc;
use swap::{
alice, alice::swap::AliceState, bob, bob::swap::BobState, network::transport::build,
storage::Database, SwapAmounts,
};
use tempfile::tempdir;
use testcontainers::clients::Cli;
use tracing_core::dispatcher::DefaultGuard;
use tracing_log::LogTracer;
use uuid::Uuid;
use xmr_btc::{alice::State0, bitcoin, config::Config, cross_curve_dleq};
/// Run the following tests with RUST_MIN_STACK=10000000
#[tokio::test]
async fn happy_path() {
let _guard = init_tracing();
let cli = Cli::default();
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
let _ = bitcoind.init(5).await;
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let btc_alice = bitcoin::Amount::ZERO;
let btc_bob = btc_to_swap * 10;
// this xmr value matches the logic of alice::calculate_amounts i.e. btc *
// 10_000 * 100
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let xmr_alice = xmr_to_swap * 10;
let xmr_bob = xmr_btc::monero::Amount::from_piconero(0);
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9876"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
alice_state,
mut alice_swarm_driver,
alice_swarm_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_peer_id,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
btc_alice,
xmr_to_swap,
xmr_alice,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_swarm_driver, bob_swarm_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr,
alice_peer_id,
&bitcoind,
&monero,
btc_to_swap,
btc_bob,
xmr_to_swap,
xmr_bob,
config,
)
.await;
let alice_swap_fut = alice::swap::swap(
alice_state,
alice_swarm_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
config,
);
let _alice_swarm_fut = tokio::spawn(async move { alice_swarm_driver.run().await });
let bob_swap_fut = bob::swap::swap(
bob_state,
bob_swarm_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
let _bob_swarm_fut = tokio::spawn(async move { bob_swarm_driver.run().await });
try_join(alice_swap_fut, bob_swap_fut).await.unwrap();
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
let xmr_alice_final = alice_xmr_wallet.as_ref().get_balance().await.unwrap();
bob_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(
btc_alice_final,
btc_alice + btc_to_swap - bitcoin::Amount::from_sat(bitcoin::TX_FEE)
);
assert!(btc_bob_final <= btc_bob - btc_to_swap);
assert!(xmr_alice_final <= xmr_alice - xmr_to_swap);
assert_eq!(xmr_bob_final, xmr_bob + xmr_to_swap);
}
/// Bob locks Btc and Alice locks Xmr. Bob does not act; he fails to send Alice
/// the encsig and fail to refund or redeem. Alice punishes.
#[tokio::test]
async fn alice_punishes_if_bob_never_acts_after_fund() {
let _guard = init_tracing();
let cli = Cli::default();
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
let _ = bitcoind.init(5).await;
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let bob_xmr_starting_balance = xmr_btc::monero::Amount::from_piconero(0);
let alice_btc_starting_balance = bitcoin::Amount::ZERO;
let alice_xmr_starting_balance = xmr_to_swap * 10;
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
alice_state,
mut alice_swarm,
alice_swarm_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_peer_id,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
alice_btc_starting_balance,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_swarm_driver, bob_swarm_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr,
alice_peer_id,
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
bob_xmr_starting_balance,
config,
)
.await;
let bob_btc_locked_fut = bob::swap::run_until(
bob_state,
bob::swap::is_btc_locked,
bob_swarm_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
let _bob_swarm_fut = tokio::spawn(async move { bob_swarm_driver.run().await });
let alice_fut = alice::swap::swap(
alice_state,
alice_swarm_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
);
let _alice_swarm_fut = tokio::spawn(async move { alice_swarm.run().await });
// Wait until alice has locked xmr and bob has locked btc
let ((alice_state, _), bob_state) = try_join(alice_fut, bob_btc_locked_fut).await.unwrap();
assert!(matches!(alice_state, AliceState::Punished));
let bob_state3 = if let BobState::BtcLocked(state3, ..) = bob_state {
state3
} else {
panic!("Bob in unexpected state");
};
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
// lock_tx_bitcoin_fee is determined by the wallet, it is not necessarily equal
// to TX_FEE
let lock_tx_bitcoin_fee = bob_btc_wallet
.transaction_fee(bob_state3.tx_lock_id())
.await
.unwrap();
assert_eq!(
btc_alice_final,
alice_btc_starting_balance + btc_to_swap - bitcoin::Amount::from_sat(2 * bitcoin::TX_FEE)
);
assert_eq!(
btc_bob_final,
bob_btc_starting_balance - btc_to_swap - lock_tx_bitcoin_fee
);
}
// Bob locks btc and Alice locks xmr. Alice fails to act so Bob refunds. Alice
// then also refunds.
#[tokio::test]
async fn both_refund() {
use tracing_subscriber::util::SubscriberInitExt as _;
let _guard = tracing_subscriber::fmt()
.with_env_filter("swap=info,xmr_btc=info")
.with_ansi(false)
.set_default();
let cli = Cli::default();
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
let _ = bitcoind.init(5).await;
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let bob_xmr_starting_balance = xmr_btc::monero::Amount::from_piconero(0);
let alice_btc_starting_balance = bitcoin::Amount::ZERO;
let alice_xmr_starting_balance = xmr_to_swap * 10;
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9879"
.parse()
.expect("failed to parse Alice's address");
let (
alice_state,
mut alice_swarm_driver,
alice_swarm_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_peer_id,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
alice_btc_starting_balance,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
Config::regtest(),
)
.await;
let (bob_state, bob_swarm_driver, bob_swarm_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr,
alice_peer_id,
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
bob_xmr_starting_balance,
Config::regtest(),
)
.await;
let bob_fut = bob::swap::swap(
bob_state,
bob_swarm_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
tokio::spawn(async move { bob_swarm_driver.run().await });
let alice_xmr_locked_fut = alice::swap::run_until(
alice_state,
alice::swap::is_xmr_locked,
alice_swarm_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
);
tokio::spawn(async move { alice_swarm_driver.run().await });
// Wait until alice has locked xmr and bob has locked btc
let (bob_state, (alice_state, alice_swarm_handle)) =
try_join(bob_fut, alice_xmr_locked_fut).await.unwrap();
let bob_state4 = if let BobState::BtcRefunded(state4) = bob_state {
state4
} else {
panic!("Bob in unexpected state");
};
let (alice_state, _) = alice::swap::swap(
alice_state,
alice_swarm_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
)
.await
.unwrap();
assert!(matches!(alice_state, AliceState::XmrRefunded));
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
// lock_tx_bitcoin_fee is determined by the wallet, it is not necessarily equal
// to TX_FEE
let lock_tx_bitcoin_fee = bob_btc_wallet
.transaction_fee(bob_state4.tx_lock_id())
.await
.unwrap();
assert_eq!(btc_alice_final, alice_btc_starting_balance);
// Alice or Bob could publish TxCancel. This means Bob could pay tx fees for
// TxCancel and TxRefund or only TxRefund
let btc_bob_final_alice_submitted_cancel = btc_bob_final
== bob_btc_starting_balance
- lock_tx_bitcoin_fee
- bitcoin::Amount::from_sat(bitcoin::TX_FEE);
let btc_bob_final_bob_submitted_cancel = btc_bob_final
== bob_btc_starting_balance
- lock_tx_bitcoin_fee
- bitcoin::Amount::from_sat(2 * bitcoin::TX_FEE);
assert!(btc_bob_final_alice_submitted_cancel || btc_bob_final_bob_submitted_cancel);
alice_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_alice_final = alice_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(xmr_alice_final, xmr_to_swap);
bob_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(xmr_bob_final, bob_xmr_starting_balance);
}
#[allow(clippy::too_many_arguments)]
async fn init_alice(
bitcoind: &Bitcoind<'_>,
monero: &Monero,
btc_to_swap: bitcoin::Amount,
_btc_starting_balance: bitcoin::Amount,
xmr_to_swap: xmr_btc::monero::Amount,
xmr_starting_balance: xmr_btc::monero::Amount,
listen: Multiaddr,
config: Config,
) -> (
AliceState,
alice::event_loop::EventLoop,
alice::event_loop::EventLoopHandle,
Arc<swap::bitcoin::Wallet>,
Arc<swap::monero::Wallet>,
PeerId,
) {
monero
.init(vec![("alice", xmr_starting_balance.as_piconero())])
.await
.unwrap();
let alice_xmr_wallet = Arc::new(swap::monero::Wallet(
monero.wallet("alice").unwrap().client(),
));
let alice_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("alice", bitcoind.node_url.clone(), config.bitcoin_network)
.await
.unwrap(),
);
let amounts = SwapAmounts {
btc: btc_to_swap,
xmr: xmr_to_swap,
};
let (alice_state, alice_behaviour) = {
let rng = &mut OsRng;
let a = bitcoin::SecretKey::new_random(rng);
let s_a = cross_curve_dleq::Scalar::random(rng);
let v_a = xmr_btc::monero::PrivateViewKey::new_random(rng);
let redeem_address = alice_btc_wallet.as_ref().new_address().await.unwrap();
let punish_address = redeem_address.clone();
let state0 = State0::new(
a,
s_a,
v_a,
amounts.btc,
amounts.xmr,
config.bitcoin_refund_timelock,
config.bitcoin_punish_timelock,
redeem_address,
punish_address,
);
(
AliceState::Started {
amounts,
state0: state0.clone(),
},
alice::Behaviour::new(state0),
)
};
let alice_peer_id = alice_behaviour.peer_id();
let alice_transport = build(alice_behaviour.identity()).unwrap();
let (swarm_driver, handle) =
alice::event_loop::EventLoop::new(alice_transport, alice_behaviour, listen).unwrap();
(
alice_state,
swarm_driver,
handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_peer_id,
)
}
#[allow(clippy::too_many_arguments)]
async fn init_bob(
alice_multiaddr: Multiaddr,
alice_peer_id: PeerId,
bitcoind: &Bitcoind<'_>,
monero: &Monero,
btc_to_swap: bitcoin::Amount,
btc_starting_balance: bitcoin::Amount,
xmr_to_swap: xmr_btc::monero::Amount,
xmr_stating_balance: xmr_btc::monero::Amount,
config: Config,
) -> (
BobState,
bob::event_loop::EventLoop,
bob::event_loop::EventLoopHandle,
Arc<swap::bitcoin::Wallet>,
Arc<swap::monero::Wallet>,
Database,
) {
let bob_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("bob", bitcoind.node_url.clone(), config.bitcoin_network)
.await
.unwrap(),
);
bitcoind
.mint(
bob_btc_wallet.inner.new_address().await.unwrap(),
btc_starting_balance,
)
.await
.unwrap();
monero
.init(vec![("bob", xmr_stating_balance.as_piconero())])
.await
.unwrap();
let bob_xmr_wallet = Arc::new(swap::monero::Wallet(monero.wallet("bob").unwrap().client()));
let amounts = SwapAmounts {
btc: btc_to_swap,
xmr: xmr_to_swap,
};
let bob_db_dir = tempdir().unwrap();
let bob_db = Database::open(bob_db_dir.path()).unwrap();
let bob_behaviour = bob::Behaviour::default();
let bob_transport = build(bob_behaviour.identity()).unwrap();
let refund_address = bob_btc_wallet.new_address().await.unwrap();
let state0 = xmr_btc::bob::State0::new(
&mut OsRng,
btc_to_swap,
xmr_to_swap,
config.bitcoin_refund_timelock,
config.bitcoin_punish_timelock,
refund_address,
);
let bob_state = BobState::Started {
state0,
amounts,
peer_id: alice_peer_id,
addr: alice_multiaddr,
};
let (swarm_driver, swarm_handle) =
bob::event_loop::EventLoop::new(bob_transport, bob_behaviour).unwrap();
(
bob_state,
swarm_driver,
swarm_handle,
bob_btc_wallet,
bob_xmr_wallet,
bob_db,
)
}
/// Utility function to initialize logging in the test environment.
/// Note that you have to keep the `_guard` in scope after calling in test:
///
/// ```rust
/// let _guard = init_tracing();
/// ```
fn init_tracing() -> DefaultGuard {
// converts all log records into tracing events
// Note: Make sure to initialize without unwrapping, otherwise this causes
// trouble when running multiple tests.
let _ = LogTracer::init();
let global_filter = tracing::Level::WARN;
let swap_filter = tracing::Level::DEBUG;
let xmr_btc_filter = tracing::Level::DEBUG;
let monero_harness_filter = tracing::Level::INFO;
let bitcoin_harness_filter = tracing::Level::INFO;
use tracing_subscriber::util::SubscriberInitExt as _;
tracing_subscriber::fmt()
.with_env_filter(format!(
"{},swap={},xmr-btc={},monero_harness={},bitcoin_harness={}",
global_filter,
swap_filter,
xmr_btc_filter,
monero_harness_filter,
bitcoin_harness_filter,
))
.set_default()
}

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use crate::testutils::{init_alice, init_bob};
use futures::future::try_join;
use libp2p::Multiaddr;
use rand::rngs::OsRng;
use swap::{alice, bob};
use testcontainers::clients::Cli;
use testutils::init_tracing;
use uuid::Uuid;
use xmr_btc::{bitcoin, config::Config};
pub mod testutils;
/// Run the following tests with RUST_MIN_STACK=10000000
#[tokio::test]
async fn happy_path() {
let _guard = init_tracing();
let cli = Cli::default();
let (
monero,
testutils::Containers {
bitcoind,
monerods: _monerods,
},
) = testutils::init_containers(&cli).await;
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let btc_alice = bitcoin::Amount::ZERO;
let btc_bob = btc_to_swap * 10;
// this xmr value matches the logic of alice::calculate_amounts i.e. btc *
// 10_000 * 100
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let xmr_alice = xmr_to_swap * 10;
let xmr_bob = xmr_btc::monero::Amount::ZERO;
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9876"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
alice_state,
mut alice_event_loop,
alice_event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_db,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
xmr_to_swap,
xmr_alice,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_event_loop, bob_event_loop_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr,
&bitcoind,
&monero,
btc_to_swap,
btc_bob,
xmr_to_swap,
config,
)
.await;
let alice_swap_fut = alice::swap::swap(
alice_state,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
config,
Uuid::new_v4(),
alice_db,
);
let _alice_swarm_fut = tokio::spawn(async move { alice_event_loop.run().await });
let bob_swap_fut = bob::swap::swap(
bob_state,
bob_event_loop_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
let _bob_swarm_fut = tokio::spawn(async move { bob_event_loop.run().await });
try_join(alice_swap_fut, bob_swap_fut).await.unwrap();
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
let xmr_alice_final = alice_xmr_wallet.as_ref().get_balance().await.unwrap();
bob_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(
btc_alice_final,
btc_alice + btc_to_swap - bitcoin::Amount::from_sat(bitcoin::TX_FEE)
);
assert!(btc_bob_final <= btc_bob - btc_to_swap);
assert!(xmr_alice_final <= xmr_alice - xmr_to_swap);
assert_eq!(xmr_bob_final, xmr_bob + xmr_to_swap);
}

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use libp2p::Multiaddr;
use rand::rngs::OsRng;
use swap::{alice, alice::swap::AliceState, bitcoin, bob, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
use uuid::Uuid;
use xmr_btc::config::Config;
pub mod testutils;
use crate::testutils::{init_alice, init_bob};
use testutils::init_tracing;
#[tokio::test]
async fn given_alice_restarts_after_encsig_is_learned_resume_swap() {
let _guard = init_tracing();
let cli = Cli::default();
let (
monero,
testutils::Containers {
bitcoind,
monerods: _monerods,
},
) = testutils::init_containers(&cli).await;
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let alice_xmr_starting_balance = xmr_to_swap * 10;
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
start_state,
mut alice_event_loop,
alice_event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
_,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_event_loop, bob_event_loop_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr.clone(),
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
config,
)
.await;
// TODO: we are making a clone of Bob's wallets here to keep them in scope after
// Bob's wallets are moved into an async task.
let bob_btc_wallet_clone = bob_btc_wallet.clone();
let bob_xmr_wallet_clone = bob_xmr_wallet.clone();
let _ = tokio::spawn(async move {
bob::swap::swap(
bob_state,
bob_event_loop_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
)
.await
});
let _bob_swarm_fut = tokio::spawn(async move { bob_event_loop.run().await });
let alice_db_datadir = tempdir().unwrap();
let alice_db = Database::open(alice_db_datadir.path()).unwrap();
let _alice_swarm_fut = tokio::spawn(async move { alice_event_loop.run().await });
let alice_swap_id = Uuid::new_v4();
let alice_state = alice::swap::run_until(
start_state,
alice::swap::is_encsig_learned,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
config,
alice_swap_id,
alice_db,
)
.await
.unwrap();
assert!(matches!(alice_state, AliceState::EncSignLearned {..}));
let alice_db = Database::open(alice_db_datadir.path()).unwrap();
let state_before_restart = alice_db.get_state(alice_swap_id).unwrap();
if let swap::state::Swap::Alice(state) = state_before_restart.clone() {
assert!(matches!(state, swap::state::Alice::EncSignLearned {..}));
}
let (mut event_loop_after_restart, event_loop_handle_after_restart) =
testutils::init_alice_event_loop(alice_multiaddr);
let _alice_swarm_fut = tokio::spawn(async move { event_loop_after_restart.run().await });
let alice_state = alice::swap::resume_from_database(
event_loop_handle_after_restart,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
config,
alice_swap_id,
alice_db,
)
.await
.unwrap();
assert!(matches!(alice_state, AliceState::BtcRedeemed {..}));
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet_clone.as_ref().balance().await.unwrap();
assert_eq!(
btc_alice_final,
btc_to_swap - bitcoin::Amount::from_sat(bitcoin::TX_FEE)
);
assert!(btc_bob_final <= bob_btc_starting_balance - btc_to_swap);
let xmr_alice_final = alice_xmr_wallet.as_ref().get_balance().await.unwrap();
bob_xmr_wallet_clone.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet_clone.as_ref().get_balance().await.unwrap();
assert!(xmr_alice_final <= alice_xmr_starting_balance - xmr_to_swap);
assert_eq!(xmr_bob_final, xmr_to_swap);
}

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use libp2p::Multiaddr;
use rand::rngs::OsRng;
use swap::{alice, bitcoin, bob, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
use uuid::Uuid;
use xmr_btc::config::Config;
pub mod testutils;
use crate::testutils::{init_alice, init_bob};
use swap::bob::swap::BobState;
use testutils::init_tracing;
#[tokio::test]
async fn given_bob_restarts_after_encsig_is_sent_resume_swap() {
let _guard = init_tracing();
let cli = Cli::default();
let (
monero,
testutils::Containers {
bitcoind,
monerods: _monerods,
},
) = testutils::init_containers(&cli).await;
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let alice_xmr_starting_balance = xmr_to_swap * 10;
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
alice_state,
mut alice_event_loop,
alice_event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_db,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_event_loop, bob_event_loop_handle, bob_btc_wallet, bob_xmr_wallet, _) =
init_bob(
alice_multiaddr.clone(),
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
config,
)
.await;
// TODO: we are making a clone of Alices's wallets here to keep them in scope
// after Alices's wallets are moved into an async task.
let alice_btc_wallet_clone = alice_btc_wallet.clone();
let alice_xmr_wallet_clone = alice_xmr_wallet.clone();
// TODO: we are making a clone of Bob's wallets here to keep them in scope after
// Bob's wallets are moved into an async task.
let bob_btc_wallet_clone = bob_btc_wallet.clone();
let bob_xmr_wallet_clone = bob_xmr_wallet.clone();
let _ = tokio::spawn(async move {
alice::swap::swap(
alice_state,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
config,
Uuid::new_v4(),
alice_db,
)
.await
});
let _alice_swarm_fut = tokio::spawn(async move { alice_event_loop.run().await });
let _bob_swarm_fut = tokio::spawn(async move { bob_event_loop.run().await });
let bob_swap_id = Uuid::new_v4();
let bob_db_datadir = tempdir().unwrap();
let bob_db = Database::open(bob_db_datadir.path()).unwrap();
let bob_state = bob::swap::run_until(
bob_state,
bob::swap::is_encsig_sent,
bob_event_loop_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
bob_swap_id,
)
.await
.unwrap();
assert!(matches!(bob_state, BobState::EncSigSent {..}));
let bob_db = Database::open(bob_db_datadir.path()).unwrap();
let state_before_restart = bob_db.get_state(bob_swap_id).unwrap();
if let swap::state::Swap::Bob(state) = state_before_restart.clone() {
assert!(matches!(state, swap::state::Bob::EncSigSent {..}));
}
let (event_loop_after_restart, event_loop_handle_after_restart) =
testutils::init_bob_event_loop();
let _alice_swarm_fut = tokio::spawn(async move { event_loop_after_restart.run().await });
let alice_state = bob::swap::resume_from_database(
event_loop_handle_after_restart,
bob_db,
bob_btc_wallet,
bob_xmr_wallet,
OsRng,
bob_swap_id,
)
.await
.unwrap();
assert!(matches!(alice_state, BobState::XmrRedeemed {..}));
let btc_alice_final = alice_btc_wallet_clone.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet_clone.as_ref().balance().await.unwrap();
assert_eq!(
btc_alice_final,
btc_to_swap - bitcoin::Amount::from_sat(bitcoin::TX_FEE)
);
assert!(btc_bob_final <= bob_btc_starting_balance - btc_to_swap);
let xmr_alice_final = alice_xmr_wallet_clone.as_ref().get_balance().await.unwrap();
bob_xmr_wallet_clone.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet_clone.as_ref().get_balance().await.unwrap();
assert!(xmr_alice_final <= alice_xmr_starting_balance - xmr_to_swap);
assert_eq!(xmr_bob_final, xmr_to_swap);
}

127
swap/tests/punish.rs Normal file
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@ -0,0 +1,127 @@
use crate::testutils::{init_alice, init_bob};
use futures::future::try_join;
use libp2p::Multiaddr;
use rand::rngs::OsRng;
use swap::{alice, alice::swap::AliceState, bob, bob::swap::BobState};
use testcontainers::clients::Cli;
use testutils::init_tracing;
use uuid::Uuid;
use xmr_btc::{bitcoin, config::Config};
pub mod testutils;
/// Bob locks Btc and Alice locks Xmr. Bob does not act; he fails to send Alice
/// the encsig and fail to refund or redeem. Alice punishes.
#[tokio::test]
async fn alice_punishes_if_bob_never_acts_after_fund() {
let _guard = init_tracing();
let cli = Cli::default();
let (
monero,
testutils::Containers {
bitcoind,
monerods: _monerods,
},
) = testutils::init_containers(&cli).await;
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let alice_btc_starting_balance = bitcoin::Amount::ZERO;
let alice_xmr_starting_balance = xmr_to_swap * 10;
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
.parse()
.expect("failed to parse Alice's address");
let config = Config::regtest();
let (
alice_state,
mut alice_event_loop,
alice_event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_db,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
config,
)
.await;
let (bob_state, bob_event_loop, bob_event_loop_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr,
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
config,
)
.await;
let bob_btc_locked_fut = bob::swap::run_until(
bob_state,
bob::swap::is_btc_locked,
bob_event_loop_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
let _bob_swarm_fut = tokio::spawn(async move { bob_event_loop.run().await });
let alice_fut = alice::swap::swap(
alice_state,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
Uuid::new_v4(),
alice_db,
);
let _alice_swarm_fut = tokio::spawn(async move { alice_event_loop.run().await });
// Wait until alice has locked xmr and bob has locked btc
let (alice_state, bob_state) = try_join(alice_fut, bob_btc_locked_fut).await.unwrap();
assert!(matches!(alice_state, AliceState::Punished));
let bob_state3 = if let BobState::BtcLocked(state3, ..) = bob_state {
state3
} else {
panic!("Bob in unexpected state");
};
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
// lock_tx_bitcoin_fee is determined by the wallet, it is not necessarily equal
// to TX_FEE
let lock_tx_bitcoin_fee = bob_btc_wallet
.transaction_fee(bob_state3.tx_lock_id())
.await
.unwrap();
assert_eq!(
btc_alice_final,
alice_btc_starting_balance + btc_to_swap - bitcoin::Amount::from_sat(2 * bitcoin::TX_FEE)
);
assert_eq!(
btc_bob_final,
bob_btc_starting_balance - btc_to_swap - lock_tx_bitcoin_fee
);
}

162
swap/tests/refund_restart.rs Normal file
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@ -0,0 +1,162 @@
use crate::testutils::{init_alice, init_bob};
use futures::future::try_join;
use libp2p::Multiaddr;
use rand::rngs::OsRng;
use swap::{alice, alice::swap::AliceState, bob, bob::swap::BobState, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
use testutils::init_tracing;
use uuid::Uuid;
use xmr_btc::{bitcoin, config::Config};
pub mod testutils;
// Bob locks btc and Alice locks xmr. Alice fails to act so Bob refunds. Alice
// then also refunds.
#[tokio::test]
async fn both_refund() {
let _guard = init_tracing();
let cli = Cli::default();
let (
monero,
testutils::Containers {
bitcoind,
monerods: _monerods,
},
) = testutils::init_containers(&cli).await;
let btc_to_swap = bitcoin::Amount::from_sat(1_000_000);
let xmr_to_swap = xmr_btc::monero::Amount::from_piconero(1_000_000_000_000);
let bob_btc_starting_balance = btc_to_swap * 10;
let bob_xmr_starting_balance = xmr_btc::monero::Amount::from_piconero(0);
let alice_btc_starting_balance = bitcoin::Amount::ZERO;
let alice_xmr_starting_balance = xmr_to_swap * 10;
// todo: This should not be hardcoded
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9879"
.parse()
.expect("failed to parse Alice's address");
let (
alice_state,
mut alice_event_loop,
alice_event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
_,
) = init_alice(
&bitcoind,
&monero,
btc_to_swap,
xmr_to_swap,
alice_xmr_starting_balance,
alice_multiaddr.clone(),
Config::regtest(),
)
.await;
let (bob_state, bob_event_loop, bob_event_loop_handle, bob_btc_wallet, bob_xmr_wallet, bob_db) =
init_bob(
alice_multiaddr.clone(),
&bitcoind,
&monero,
btc_to_swap,
bob_btc_starting_balance,
xmr_to_swap,
Config::regtest(),
)
.await;
let bob_fut = bob::swap::swap(
bob_state,
bob_event_loop_handle,
bob_db,
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
OsRng,
Uuid::new_v4(),
);
tokio::spawn(async move { bob_event_loop.run().await });
let alice_swap_id = Uuid::new_v4();
let alice_db_datadir = tempdir().unwrap();
let alice_db = Database::open(alice_db_datadir.path()).unwrap();
let alice_xmr_locked_fut = alice::swap::run_until(
alice_state,
alice::swap::is_xmr_locked,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
alice_swap_id,
alice_db,
);
tokio::spawn(async move { alice_event_loop.run().await });
// Wait until alice has locked xmr and bob has locked btc
let (bob_state, alice_state) = try_join(bob_fut, alice_xmr_locked_fut).await.unwrap();
let bob_state4 = if let BobState::BtcRefunded(state4) = bob_state {
state4
} else {
panic!("Bob in unexpected state");
};
let alice_db = Database::open(alice_db_datadir.path()).unwrap();
let (mut alice_event_loop, alice_event_loop_handle) =
testutils::init_alice_event_loop(alice_multiaddr);
let alice_state = alice::swap::swap(
alice_state,
alice_event_loop_handle,
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
Config::regtest(),
alice_swap_id,
alice_db,
)
.await
.unwrap();
tokio::spawn(async move { alice_event_loop.run().await });
assert!(matches!(alice_state, AliceState::XmrRefunded));
let btc_alice_final = alice_btc_wallet.as_ref().balance().await.unwrap();
let btc_bob_final = bob_btc_wallet.as_ref().balance().await.unwrap();
// lock_tx_bitcoin_fee is determined by the wallet, it is not necessarily equal
// to TX_FEE
let lock_tx_bitcoin_fee = bob_btc_wallet
.transaction_fee(bob_state4.tx_lock_id())
.await
.unwrap();
assert_eq!(btc_alice_final, alice_btc_starting_balance);
// Alice or Bob could publish TxCancel. This means Bob could pay tx fees for
// TxCancel and TxRefund or only TxRefund
let btc_bob_final_alice_submitted_cancel = btc_bob_final
== bob_btc_starting_balance
- lock_tx_bitcoin_fee
- bitcoin::Amount::from_sat(bitcoin::TX_FEE);
let btc_bob_final_bob_submitted_cancel = btc_bob_final
== bob_btc_starting_balance
- lock_tx_bitcoin_fee
- bitcoin::Amount::from_sat(2 * bitcoin::TX_FEE);
assert!(btc_bob_final_alice_submitted_cancel || btc_bob_final_bob_submitted_cancel);
alice_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_alice_final = alice_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(xmr_alice_final, xmr_to_swap);
bob_xmr_wallet.as_ref().0.refresh().await.unwrap();
let xmr_bob_final = bob_xmr_wallet.as_ref().get_balance().await.unwrap();
assert_eq!(xmr_bob_final, bob_xmr_starting_balance);
}

279
swap/tests/testutils/mod.rs Normal file
View File

@ -0,0 +1,279 @@
use bitcoin_harness::Bitcoind;
use libp2p::core::Multiaddr;
use monero_harness::{image, Monero};
use rand::rngs::OsRng;
use std::sync::Arc;
use swap::{
alice, alice::swap::AliceState, bitcoin, bob, bob::swap::BobState, monero,
network::transport::build, storage::Database, SwapAmounts,
};
use tempfile::tempdir;
use testcontainers::{clients::Cli, Container};
use tracing_core::dispatcher::DefaultGuard;
use tracing_log::LogTracer;
use xmr_btc::{alice::State0, config::Config, cross_curve_dleq};
pub async fn init_containers(cli: &Cli) -> (Monero, Containers<'_>) {
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
let _ = bitcoind.init(5).await;
let (monero, monerods) = Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
(monero, Containers { bitcoind, monerods })
}
pub async fn init_wallets(
name: &str,
bitcoind: &Bitcoind<'_>,
monero: &Monero,
btc_starting_balance: Option<xmr_btc::bitcoin::Amount>,
xmr_starting_balance: Option<xmr_btc::monero::Amount>,
config: Config,
) -> (Arc<bitcoin::Wallet>, Arc<monero::Wallet>) {
match xmr_starting_balance {
Some(amount) => {
monero
.init(vec![(name, amount.as_piconero())])
.await
.unwrap();
}
None => {
monero
.init(vec![(name, monero::Amount::ZERO.as_piconero())])
.await
.unwrap();
}
};
let xmr_wallet = Arc::new(swap::monero::Wallet(monero.wallet(name).unwrap().client()));
let btc_wallet = Arc::new(
swap::bitcoin::Wallet::new(name, bitcoind.node_url.clone(), config.bitcoin_network)
.await
.unwrap(),
);
if let Some(amount) = btc_starting_balance {
bitcoind
.mint(btc_wallet.inner.new_address().await.unwrap(), amount)
.await
.unwrap();
}
(btc_wallet, xmr_wallet)
}
pub async fn init_alice_state(
btc_to_swap: bitcoin::Amount,
xmr_to_swap: monero::Amount,
alice_btc_wallet: Arc<bitcoin::Wallet>,
config: Config,
) -> AliceState {
let rng = &mut OsRng;
let amounts = SwapAmounts {
btc: btc_to_swap,
xmr: xmr_to_swap,
};
let a = crate::bitcoin::SecretKey::new_random(rng);
let s_a = cross_curve_dleq::Scalar::random(rng);
let v_a = xmr_btc::monero::PrivateViewKey::new_random(rng);
let redeem_address = alice_btc_wallet.as_ref().new_address().await.unwrap();
let punish_address = redeem_address.clone();
let state0 = State0::new(
a,
s_a,
v_a,
amounts.btc,
amounts.xmr,
config.bitcoin_refund_timelock,
config.bitcoin_punish_timelock,
redeem_address,
punish_address,
);
AliceState::Started { amounts, state0 }
}
pub fn init_alice_event_loop(
listen: Multiaddr,
) -> (
alice::event_loop::EventLoop,
alice::event_loop::EventLoopHandle,
) {
let alice_behaviour = alice::Behaviour::default();
let alice_transport = build(alice_behaviour.identity()).unwrap();
alice::event_loop::EventLoop::new(alice_transport, alice_behaviour, listen).unwrap()
}
#[allow(clippy::too_many_arguments)]
pub async fn init_alice(
bitcoind: &Bitcoind<'_>,
monero: &Monero,
btc_to_swap: bitcoin::Amount,
xmr_to_swap: monero::Amount,
xmr_starting_balance: xmr_btc::monero::Amount,
listen: Multiaddr,
config: Config,
) -> (
AliceState,
alice::event_loop::EventLoop,
alice::event_loop::EventLoopHandle,
Arc<swap::bitcoin::Wallet>,
Arc<swap::monero::Wallet>,
Database,
) {
let (alice_btc_wallet, alice_xmr_wallet) = init_wallets(
"alice",
bitcoind,
monero,
None,
Some(xmr_starting_balance),
config,
)
.await;
let alice_start_state =
init_alice_state(btc_to_swap, xmr_to_swap, alice_btc_wallet.clone(), config).await;
let (event_loop, event_loop_handle) = init_alice_event_loop(listen);
let alice_db_datadir = tempdir().unwrap();
let alice_db = Database::open(alice_db_datadir.path()).unwrap();
(
alice_start_state,
event_loop,
event_loop_handle,
alice_btc_wallet,
alice_xmr_wallet,
alice_db,
)
}
pub async fn init_bob_state(
alice_multiaddr: Multiaddr,
btc_to_swap: bitcoin::Amount,
xmr_to_swap: xmr_btc::monero::Amount,
bob_btc_wallet: Arc<bitcoin::Wallet>,
config: Config,
) -> BobState {
let amounts = SwapAmounts {
btc: btc_to_swap,
xmr: xmr_to_swap,
};
let refund_address = bob_btc_wallet.new_address().await.unwrap();
let state0 = xmr_btc::bob::State0::new(
&mut OsRng,
btc_to_swap,
xmr_to_swap,
config.bitcoin_refund_timelock,
config.bitcoin_punish_timelock,
refund_address,
);
BobState::Started {
state0,
amounts,
addr: alice_multiaddr,
}
}
pub fn init_bob_event_loop() -> (bob::event_loop::EventLoop, bob::event_loop::EventLoopHandle) {
let bob_behaviour = bob::Behaviour::default();
let bob_transport = build(bob_behaviour.identity()).unwrap();
bob::event_loop::EventLoop::new(bob_transport, bob_behaviour).unwrap()
}
#[allow(clippy::too_many_arguments)]
pub async fn init_bob(
alice_multiaddr: Multiaddr,
bitcoind: &Bitcoind<'_>,
monero: &Monero,
btc_to_swap: bitcoin::Amount,
btc_starting_balance: bitcoin::Amount,
xmr_to_swap: xmr_btc::monero::Amount,
config: Config,
) -> (
BobState,
bob::event_loop::EventLoop,
bob::event_loop::EventLoopHandle,
Arc<swap::bitcoin::Wallet>,
Arc<swap::monero::Wallet>,
Database,
) {
let (bob_btc_wallet, bob_xmr_wallet) = init_wallets(
"bob",
bitcoind,
monero,
Some(btc_starting_balance),
None,
config,
)
.await;
let bob_state = init_bob_state(
alice_multiaddr,
btc_to_swap,
xmr_to_swap,
bob_btc_wallet.clone(),
config,
)
.await;
let (event_loop, event_loop_handle) = init_bob_event_loop();
let bob_db_dir = tempdir().unwrap();
let bob_db = Database::open(bob_db_dir.path()).unwrap();
(
bob_state,
event_loop,
event_loop_handle,
bob_btc_wallet,
bob_xmr_wallet,
bob_db,
)
}
// This is just to keep the containers alive
#[allow(dead_code)]
pub struct Containers<'a> {
pub bitcoind: Bitcoind<'a>,
pub monerods: Vec<Container<'a, Cli, image::Monero>>,
}
/// Utility function to initialize logging in the test environment.
/// Note that you have to keep the `_guard` in scope after calling in test:
///
/// ```rust
/// let _guard = init_tracing();
/// ```
pub fn init_tracing() -> DefaultGuard {
// converts all log records into tracing events
// Note: Make sure to initialize without unwrapping, otherwise this causes
// trouble when running multiple tests.
let _ = LogTracer::init();
let global_filter = tracing::Level::WARN;
let swap_filter = tracing::Level::DEBUG;
let xmr_btc_filter = tracing::Level::DEBUG;
let monero_harness_filter = tracing::Level::INFO;
let bitcoin_harness_filter = tracing::Level::INFO;
use tracing_subscriber::util::SubscriberInitExt as _;
tracing_subscriber::fmt()
.with_env_filter(format!(
"{},swap={},xmr-btc={},monero_harness={},bitcoin_harness={}",
global_filter,
swap_filter,
xmr_btc_filter,
monero_harness_filter,
bitcoin_harness_filter,
))
.set_default()
}

18
xmr-btc/src/alice.rs
View File

@ -435,16 +435,16 @@ impl State {
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct State0 {
a: bitcoin::SecretKey,
s_a: cross_curve_dleq::Scalar,
v_a: monero::PrivateViewKey,
pub a: bitcoin::SecretKey,
pub s_a: cross_curve_dleq::Scalar,
pub v_a: monero::PrivateViewKey,
#[serde(with = "::bitcoin::util::amount::serde::as_sat")]
btc: bitcoin::Amount,
xmr: monero::Amount,
refund_timelock: u32,
punish_timelock: u32,
redeem_address: bitcoin::Address,
punish_address: bitcoin::Address,
pub btc: bitcoin::Amount,
pub xmr: monero::Amount,
pub refund_timelock: u32,
pub punish_timelock: u32,
pub redeem_address: bitcoin::Address,
pub punish_address: bitcoin::Address,
}
impl State0 {

44
xmr-btc/src/bob.rs
View File

@ -346,7 +346,7 @@ impl_from_child_enum!(State3, State);
impl_from_child_enum!(State4, State);
impl_from_child_enum!(State5, State);
#[derive(Debug, Deserialize, Serialize)]
#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
pub struct State0 {
b: bitcoin::SecretKey,
s_b: cross_curve_dleq::Scalar,
@ -560,25 +560,25 @@ impl State2 {
}
}
#[derive(Debug, Serialize, Deserialize)]
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct State3 {
A: bitcoin::PublicKey,
b: bitcoin::SecretKey,
s_b: cross_curve_dleq::Scalar,
pub A: bitcoin::PublicKey,
pub b: bitcoin::SecretKey,
pub s_b: cross_curve_dleq::Scalar,
S_a_monero: monero::PublicKey,
S_a_bitcoin: bitcoin::PublicKey,
v: monero::PrivateViewKey,
#[serde(with = "::bitcoin::util::amount::serde::as_sat")]
btc: bitcoin::Amount,
xmr: monero::Amount,
refund_timelock: u32,
pub refund_timelock: u32,
punish_timelock: u32,
refund_address: bitcoin::Address,
pub refund_address: bitcoin::Address,
redeem_address: bitcoin::Address,
punish_address: bitcoin::Address,
tx_lock: bitcoin::TxLock,
tx_cancel_sig_a: Signature,
tx_refund_encsig: EncryptedSignature,
pub tx_lock: bitcoin::TxLock,
pub tx_cancel_sig_a: Signature,
pub tx_refund_encsig: EncryptedSignature,
}
impl State3 {
@ -626,11 +626,11 @@ impl State3 {
}
}
#[derive(Debug, Clone, Deserialize, Serialize)]
#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct State4 {
pub A: bitcoin::PublicKey,
pub b: bitcoin::SecretKey,
s_b: cross_curve_dleq::Scalar,
pub s_b: cross_curve_dleq::Scalar,
S_a_monero: monero::PublicKey,
pub S_a_bitcoin: bitcoin::PublicKey,
v: monero::PrivateViewKey,
@ -639,12 +639,12 @@ pub struct State4 {
xmr: monero::Amount,
pub refund_timelock: u32,
punish_timelock: u32,
refund_address: bitcoin::Address,
pub refund_address: bitcoin::Address,
pub redeem_address: bitcoin::Address,
punish_address: bitcoin::Address,
pub tx_lock: bitcoin::TxLock,
tx_cancel_sig_a: Signature,
tx_refund_encsig: EncryptedSignature,
pub tx_cancel_sig_a: Signature,
pub tx_refund_encsig: EncryptedSignature,
}
impl State4 {
@ -823,25 +823,25 @@ impl State4 {
}
}
#[derive(Debug, Clone, Deserialize, Serialize)]
#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct State5 {
A: bitcoin::PublicKey,
b: bitcoin::SecretKey,
pub b: bitcoin::SecretKey,
#[serde(with = "monero_private_key")]
s_a: monero::PrivateKey,
s_b: cross_curve_dleq::Scalar,
pub s_b: cross_curve_dleq::Scalar,
S_a_monero: monero::PublicKey,
S_a_bitcoin: bitcoin::PublicKey,
v: monero::PrivateViewKey,
pub S_a_bitcoin: bitcoin::PublicKey,
pub v: monero::PrivateViewKey,
#[serde(with = "::bitcoin::util::amount::serde::as_sat")]
btc: bitcoin::Amount,
xmr: monero::Amount,
refund_timelock: u32,
punish_timelock: u32,
refund_address: bitcoin::Address,
redeem_address: bitcoin::Address,
pub redeem_address: bitcoin::Address,
punish_address: bitcoin::Address,
tx_lock: bitcoin::TxLock,
pub tx_lock: bitcoin::TxLock,
tx_refund_encsig: EncryptedSignature,
tx_cancel_sig: Signature,
}

1
xmr-btc/src/monero.rs
View File

@ -76,6 +76,7 @@ pub struct PublicViewKey(PublicKey);
pub struct Amount(u64);
impl Amount {
pub const ZERO: Self = Self(0);
/// Create an [Amount] with piconero precision and the given number of
/// piconeros.
///