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

use crate::testutils::{init_alice, init_bob};
use bitcoin_harness::Bitcoind;
use futures::future::try_join;
use libp2p::Multiaddr;
use monero_harness::Monero;
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;

/// 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_event_loop,
        alice_event_loop_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_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,
            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_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);
}

/// 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_event_loop,
        alice_event_loop_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_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,
            bob_xmr_starting_balance,
            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_db_datadir = tempdir().unwrap();
    let alice_db = Database::open(alice_db_datadir.path()).unwrap();

    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
    );
}

// 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_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_swarm_handle,
        alice_btc_wallet.clone(),
        alice_xmr_wallet.clone(),
        Config::regtest(),
        alice_swap_id,
        alice_db,
    );

    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_db = Database::open(alice_db_datadir.path()).unwrap();

    let (alice_state, _) = alice::swap::swap(
        alice_state,
        alice_swarm_handle,
        alice_btc_wallet.clone(),
        alice_xmr_wallet.clone(),
        Config::regtest(),
        alice_swap_id,
        alice_db,
    )
    .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);
}