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wow-btc-swap
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Some more fixes and comments after testing Alice's recovery

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pull/36/head
Lucas Soriano del Pino 4 years ago committed by rishflab
parent bea99185ed
commit f5ff50157e
3 changed files with 189 additions and 131 deletions
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8
swap/src/bob.rs
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@ -167,6 +167,9 @@ pub async fn swap(
info!("Resumed execution of generator, got: {:?}", state);
// TODO: Protect against transient errors
// TODO: Ignore transaction-already-in-block-chain errors
match state {
GeneratorState::Yielded(bob::Action::LockBtc(tx_lock)) => {
let signed_tx_lock = bitcoin_wallet.sign_tx_lock(tx_lock).await?;
@ -184,8 +187,9 @@ pub async fn swap(
guard.0.send_message3(alice.clone(), tx_redeem_encsig);
info!("Sent Bitcoin redeem encsig");
// TODO: Does Bob need to wait for Alice to send an empty response, or can we
// just continue?
// FIXME: Having to wait for Alice's response here is a big problem, because
// we're stuck if she doesn't send her response back. I believe this is
// currently necessary, so we may have to rework this and/or how we use libp2p
match guard.0.next().shared().await {
OutEvent::Message3 => {
debug!("Got Message3 empty response");

77
swap/src/recover.rs
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@ -1,3 +1,15 @@
//! 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::{
monero::CreateWalletForOutput,
state::{Alice, Bob, Swap},
@ -257,7 +269,7 @@ pub async fn alice_recover(
TxPunish::new(&tx_cancel, &state.punish_address, state.punish_timelock);
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_cancel_sig_bob.clone();
let sig_b = state.tx_punish_sig_bob.clone();
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
@ -282,22 +294,61 @@ pub async fn alice_recover(
state.a.public(),
state.B.clone(),
);
let tx_refund = TxRefund::new(&tx_cancel, &state.refund_address);
let tx_punish = TxPunish::new(&tx_cancel, &state.punish_address, state.punish_timelock);
info!("Checking if Bitcoin has already been refunded");
let sig_a = state.a.sign(tx_punish.digest());
let sig_b = state.tx_punish_sig_bob.clone();
// TODO: Protect against transient errors so that we can correctly decide if the
// bitcoin has been refunded
match bitcoin_wallet.0.get_raw_transaction(tx_refund.txid()).await {
Ok(tx_refund_published) => {
info!("Bitcoin already refunded");
let sig_tx_punish = tx_punish.add_signatures(
&tx_cancel,
(state.a.public(), sig_a),
(state.B.clone(), sig_b),
)?;
let s_a = monero::PrivateKey {
scalar: state.s_a.into_ed25519(),
};
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
info!("Successfully punished Bob's inactivity by taking bitcoin");
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.clone(), tx_refund.digest());
let s_b = xmr_btc::bitcoin::recover(
state.S_b_bitcoin,
tx_refund_sig,
tx_refund_encsig,
)?;
let s_b = monero::PrivateKey::from_scalar(
xmr_btc::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 =
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.clone(), sig_b),
)?;
bitcoin_wallet
.broadcast_signed_transaction(sig_tx_punish)
.await?;
info!("Successfully punished Bob's inactivity by taking bitcoin");
}
}
}
Alice::BtcRefunded {
view_key,

235
swap/tests/e2e.rs
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@ -1,120 +1,123 @@
#[cfg(not(feature = "tor"))]
mod e2e_test {
use bitcoin_harness::Bitcoind;
use futures::{channel::mpsc, future::try_join};
use libp2p::Multiaddr;
use monero_harness::Monero;
use std::sync::Arc;
use swap::{alice, bob, network::transport::build, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
// NOTE: For some reason running these tests overflows the stack. In order to
// mitigate this run them with:
//
// RUST_MIN_STACK=100000000 cargo test
#[tokio::test]
async fn swap() {
let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9876"
.parse()
.expect("failed to parse Alice's address");
let cli = Cli::default();
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
let _ = bitcoind.init(5).await;
let btc = bitcoin::Amount::from_sat(1_000_000);
let btc_alice = bitcoin::Amount::ZERO;
let btc_bob = btc * 10;
// this xmr value matches the logic of alice::calculate_amounts i.e. btc *
// 10_000 * 100
let xmr = 1_000_000_000_000;
let xmr_alice = xmr * 10;
let xmr_bob = 0;
let alice_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("alice", bitcoind.node_url.clone())
.await
.unwrap(),
);
let bob_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("bob", bitcoind.node_url.clone())
.await
.unwrap(),
);
bitcoind
.mint(bob_btc_wallet.0.new_address().await.unwrap(), btc_bob)
use bitcoin_harness::Bitcoind;
use futures::{channel::mpsc, future::try_join};
use libp2p::Multiaddr;
use monero_harness::Monero;
use std::sync::Arc;
use swap::{alice, bob, network::transport::build, storage::Database};
use tempfile::tempdir;
use testcontainers::clients::Cli;
// NOTE: For some reason running these tests overflows the stack. In order to
// mitigate this run them with:
//
// RUST_MIN_STACK=100000000 cargo test
#[tokio::test]
async fn swap() {
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 alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9876"
.parse()
.expect("failed to parse Alice's address");
let cli = Cli::default();
let bitcoind = Bitcoind::new(&cli, "0.19.1").unwrap();
dbg!(&bitcoind.node_url);
let _ = bitcoind.init(5).await;
let btc = bitcoin::Amount::from_sat(1_000_000);
let btc_alice = bitcoin::Amount::ZERO;
let btc_bob = btc * 10;
// this xmr value matches the logic of alice::calculate_amounts i.e. btc *
// 10_000 * 100
let xmr = 1_000_000_000_000;
let xmr_alice = xmr * 10;
let xmr_bob = 0;
let alice_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("alice", bitcoind.node_url.clone())
.await
.unwrap();
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
monero
.init(vec![("alice", xmr_alice), ("bob", xmr_bob)])
.unwrap(),
);
let bob_btc_wallet = Arc::new(
swap::bitcoin::Wallet::new("bob", bitcoind.node_url.clone())
.await
.unwrap(),
);
bitcoind
.mint(bob_btc_wallet.0.new_address().await.unwrap(), btc_bob)
.await
.unwrap();
let (monero, _container) =
Monero::new(&cli, None, vec!["alice".to_string(), "bob".to_string()])
.await
.unwrap();
let alice_xmr_wallet = Arc::new(swap::monero::Wallet(
monero.wallet("alice").unwrap().client(),
));
let bob_xmr_wallet = Arc::new(swap::monero::Wallet(monero.wallet("bob").unwrap().client()));
let alice_behaviour = alice::Alice::default();
let alice_transport = build(alice_behaviour.identity()).unwrap();
let db_dir = tempdir().unwrap();
let db = Database::open(db_dir.path()).unwrap();
let alice_swap = alice::swap(
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
db,
alice_multiaddr.clone(),
alice_transport,
alice_behaviour,
);
let db_dir = tempdir().unwrap();
let db = Database::open(db_dir.path()).unwrap();
let (cmd_tx, mut _cmd_rx) = mpsc::channel(1);
let (mut rsp_tx, rsp_rx) = mpsc::channel(1);
let bob_behaviour = bob::Bob::default();
let bob_transport = build(bob_behaviour.identity()).unwrap();
let bob_swap = bob::swap(
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
db,
btc.as_sat(),
alice_multiaddr,
cmd_tx,
rsp_rx,
bob_transport,
bob_behaviour,
);
// automate the verification step by accepting any amounts sent over by Alice
rsp_tx.try_send(swap::Rsp::VerifiedAmounts).unwrap();
try_join(alice_swap, bob_swap).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 - bitcoin::Amount::from_sat(xmr_btc::bitcoin::TX_FEE)
);
assert!(btc_bob_final <= btc_bob - btc);
assert!(xmr_alice_final.as_piconero() <= xmr_alice - xmr);
assert_eq!(xmr_bob_final.as_piconero(), xmr_bob + xmr);
}
monero
.init(vec![("alice", xmr_alice), ("bob", xmr_bob)])
.await
.unwrap();
let alice_xmr_wallet = Arc::new(swap::monero::Wallet(
monero.wallet("alice").unwrap().client(),
));
let bob_xmr_wallet = Arc::new(swap::monero::Wallet(monero.wallet("bob").unwrap().client()));
let alice_behaviour = alice::Alice::default();
let alice_transport = build(alice_behaviour.identity()).unwrap();
let db = Database::open(std::path::Path::new("../.swap-db/")).unwrap();
let alice_swap = alice::swap(
alice_btc_wallet.clone(),
alice_xmr_wallet.clone(),
db,
alice_multiaddr.clone(),
alice_transport,
alice_behaviour,
);
let db_dir = tempdir().unwrap();
let db = Database::open(db_dir.path()).unwrap();
let (cmd_tx, mut _cmd_rx) = mpsc::channel(1);
let (mut rsp_tx, rsp_rx) = mpsc::channel(1);
let bob_behaviour = bob::Bob::default();
let bob_transport = build(bob_behaviour.identity()).unwrap();
let bob_swap = bob::swap(
bob_btc_wallet.clone(),
bob_xmr_wallet.clone(),
db,
btc.as_sat(),
alice_multiaddr,
cmd_tx,
rsp_rx,
bob_transport,
bob_behaviour,
);
// automate the verification step by accepting any amounts sent over by Alice
rsp_tx.try_send(swap::Rsp::VerifiedAmounts).unwrap();
try_join(alice_swap, bob_swap).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 - bitcoin::Amount::from_sat(xmr_btc::bitcoin::TX_FEE)
);
assert!(btc_bob_final <= btc_bob - btc);
assert!(xmr_alice_final.as_piconero() <= xmr_alice - xmr);
assert_eq!(xmr_bob_final.as_piconero(), xmr_bob + xmr);
}

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