xmr-btc-swap/swap/tests/e2e.rs

use bitcoin_harness::Bitcoind;
use futures::future::try_join;
use libp2p::Multiaddr;
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::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_swarm_driver,
        alice_swarm_handle,
        alice_btc_wallet,
        alice_xmr_wallet,
    ) = 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,
            &bitcoind,
            &monero,
            btc_to_swap,
            btc_bob,
            xmr_to_swap,
            xmr_bob,
            config,
        )
        .await;

    let alice_db_datadir = tempdir().unwrap();
    let alice_db = Database::open(alice_db_datadir.path()).unwrap();

    let alice_swap_fut = alice::swap::swap(
        alice_state,
        alice_swarm_handle,
        alice_btc_wallet.clone(),
        alice_xmr_wallet.clone(),
        config,
        Uuid::new_v4(),
        alice_db,
    );

    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::ZERO;

    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) =
        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,
            &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_db_datadir = tempdir().unwrap();
    let alice_db = Database::open(alice_db_datadir.path()).unwrap();

    let alice_fut = alice::swap::swap(
        alice_state,
        alice_swarm_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_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,
    ) = 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,
            &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(),
        todo!(),
        todo!(),
    );

    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(),
        todo!(),
        todo!(),
    )
    .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>,
) {
    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 rng = &mut OsRng;
    let (alice_state, alice_behaviour) = {
        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_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,
    )
}

#[allow(clippy::too_many_arguments)]
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,
    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,
        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()
}