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xmr-btc-swap/swap/src/bob/swap.rs

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Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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use crate::{
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bob::{execution::negotiate, OutEvent, Swarm},
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storage::Database,
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SwapAmounts,
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};
use anyhow::Result;
use async_recursion::async_recursion;
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use libp2p::{core::Multiaddr, PeerId};
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use rand::{CryptoRng, RngCore};
use std::sync::Arc;
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use tracing::debug;
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use uuid::Uuid;
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use xmr_btc::bob::{self};
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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// The same data structure is used for swap execution and recovery.
// This allows for a seamless transition from a failed swap to recovery.
pub enum BobState {
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Started {
state0: bob::State0,
amounts: SwapAmounts,
peer_id: PeerId,
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addr: Multiaddr,
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},
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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Negotiated(bob::State2, PeerId),
BtcLocked(bob::State3, PeerId),
XmrLocked(bob::State4, PeerId),
EncSigSent(bob::State4, PeerId),
BtcRedeemed(bob::State5),
Cancelled(bob::State4),
BtcRefunded,
XmrRedeemed,
Punished,
SafelyAborted,
}
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pub async fn swap<R>(
state: BobState,
swarm: Swarm,
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,
{
run_until(state, is_complete, swarm, db, bitcoin_wallet, monero_wallet, rng, swap_id).await
}
// TODO: use macro or generics
pub fn is_complete(state: &BobState) -> bool {
matches!(state, BobState::BtcRefunded| BobState::XmrRedeemed | BobState::Punished | BobState::SafelyAborted)
}
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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// State machine driver for swap execution
#[async_recursion]
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pub async fn run_until<R>(
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state: BobState,
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is_state: fn(&BobState) -> bool,
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mut swarm: Swarm,
db: Database,
bitcoin_wallet: Arc<crate::bitcoin::Wallet>,
monero_wallet: Arc<crate::monero::Wallet>,
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mut rng: R,
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swap_id: Uuid,
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) -> Result<BobState>
where
R: RngCore + CryptoRng + Send,
{
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if is_state(&state) {
Ok(state)
} else {
match state {
BobState::Started {
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state0,
amounts,
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peer_id,
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addr,
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} => {
let state2 = negotiate(
state0,
amounts,
&mut swarm,
addr,
&mut rng,
bitcoin_wallet.clone(),
)
.await?;
run_until(
BobState::Negotiated(state2, peer_id),
is_state,
swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
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);
run_until(
BobState::BtcLocked(state3, alice_peer_id),
is_state,
swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
// Bob has locked Btc
// Watch for Alice to Lock Xmr or for t1 to elapse
BobState::BtcLocked(state3, alice_peer_id) => {
// todo: watch until t1, not indefinetely
let state4 = match swarm.next().await {
OutEvent::Message2(msg) => {
state3
.watch_for_lock_xmr(monero_wallet.as_ref(), msg)
.await?
}
other => panic!("unexpected event: {:?}", other),
};
run_until(
BobState::XmrLocked(state4, alice_peer_id),
is_state,
swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
BobState::XmrLocked(state, alice_peer_id) => {
// Alice has locked Xmr
// Bob sends Alice his key
let tx_redeem_encsig = state.tx_redeem_encsig();
// Do we have to wait for a response?
// What if Alice fails to receive this? Should we always resend?
// todo: If we cannot dial Alice we should go to EncSigSent. Maybe dialing
// should happen in this arm?
swarm.send_message3(alice_peer_id.clone(), tx_redeem_encsig);
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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// Sadly we have to poll the swarm to get make sure the message is sent?
// 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 swarm.next().await {
OutEvent::Message3 => {
debug!("Got Message3 empty response");
}
other => panic!("unexpected event: {:?}", other),
};
Fix happy path test Poll bob swarm to send encsig after calling send message3. Comment out unimplmented wait for transaction finality trait. Dial alice.
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Allow Bob to exit execution at a specified state
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run_until(
BobState::EncSigSent(state, alice_peer_id),
is_state,
swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.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());
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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tokio::select! {
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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val = redeem_watcher => {
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run_until(
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BobState::BtcRedeemed(val?),
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is_state,
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swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
WIP: Test simplified swap execution
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swap_id,
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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)
.await
}
Resolve rebase issues, restructure code and fix warnings
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_ = t1_timeout => {
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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// Check whether TxCancel has been published.
// We should not fail if the transaction is already on the blockchain
Fix clippy warnings and formatting
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if state.check_for_tx_cancel(bitcoin_wallet.as_ref()).await.is_err() {
state.submit_tx_cancel(bitcoin_wallet.as_ref()).await?;
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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}
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run_until(
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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BobState::Cancelled(state),
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is_state,
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swarm,
db,
bitcoin_wallet,
monero_wallet,
WIP: Test simplified swap execution
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rng,
swap_id
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)
.await
}
}
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}
BobState::BtcRedeemed(state) => {
// Bob redeems XMR using revealed s_a
state.claim_xmr(monero_wallet.as_ref()).await?;
run_until(
BobState::XmrRedeemed,
is_state,
swarm,
db,
bitcoin_wallet,
monero_wallet,
rng,
swap_id,
)
.await
}
BobState::Cancelled(_state) => Ok(BobState::BtcRefunded),
BobState::BtcRefunded => Ok(BobState::BtcRefunded),
BobState::Punished => Ok(BobState::Punished),
BobState::SafelyAborted => Ok(BobState::SafelyAborted),
BobState::XmrRedeemed => Ok(BobState::XmrRedeemed),
Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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}
}
}
Resolve rebase issues, restructure code and fix warnings
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Allow Bob to exit execution at a specified state
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Add Alice execution path Consolidate and simplify swap execution. Generators are no longer needed. Consolidate recovery and swap data structures. The recursive calls can be replaced with a loop if returning prior to completion is desired for testing purposes. Fill out alice abort path Move state machine executors into seperate files Not compiling due to recursion/async issues Fix async recursion compilation errors Fix Bob swap execution Remove check for ack message from Alice. Seems like a bad idea to rely on an acknowledgement message instead of looking at the blockchain. Fix Bob abort Fix warnings Xmr lock complete Add TxCancel submit to XmrLocked Bob swap completed Remove alice
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// // State machine driver for recovery execution
// #[async_recursion]
// pub async fn abort(state: BobState, io: Io) -> Result<BobState> {
// match state {
// BobState::Started => {
// // Nothing has been commited by either party, abort swap.
// abort(BobState::SafelyAborted, io).await
// }
// BobState::Negotiated => {
// // Nothing has been commited by either party, abort swap.
// abort(BobState::SafelyAborted, io).await
// }
// BobState::BtcLocked => {
// // Bob has locked BTC and must refund it
// // Bob waits for alice to publish TxRedeem or t1
// if unimplemented!("TxRedeemSeen") {
// // Alice has redeemed revealing s_a
// abort(BobState::BtcRedeemed, io).await
// } else if unimplemented!("T1Elapsed") {
// // publish TxCancel or see if it has been published
// abort(BobState::Cancelled, io).await
// } else {
// Err(unimplemented!())
// }
// }
// BobState::XmrLocked => {
// // Alice has locked Xmr
// // Wait until t1
// if unimplemented!(">t1 and <t2") {
// // Bob publishes TxCancel
// abort(BobState::Cancelled, io).await
// } else {
// // >t2
// // submit TxCancel
// abort(BobState::Punished, io).await
// }
// }
// BobState::Cancelled => {
// // Bob has cancelled the swap
// // If <t2 Bob refunds
// if unimplemented!("<t2") {
// // Submit TxRefund
// abort(BobState::BtcRefunded, io).await
// } else {
// // Bob failed to refund in time and has been punished
// abort(BobState::Punished, io).await
// }
// }
// BobState::BtcRedeemed => {
// // Bob uses revealed s_a to redeem XMR
// abort(BobState::XmrRedeemed, io).await
// }
// BobState::BtcRefunded => Ok(BobState::BtcRefunded),
// BobState::Punished => Ok(BobState::Punished),
// BobState::SafelyAborted => Ok(BobState::SafelyAborted),
// BobState::XmrRedeemed => Ok(BobState::XmrRedeemed),
// }
// }
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