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Don't match on expired_timelocks and race it in a select in parallel

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There is no point in first checking for the expired timelocks and
then constructing a `select!` that also watches for the timelock to
expiry.

We can simply only have the select! invocation to achieve the same
effect. In case the timelock is already expired, this future will
resolve immediately.

Normally, the polling order of `select!` is pseudo-random. We
configure it to be _biased_ here to make sure the futures are polled
in order.
This commit is contained in:
Thomas Eizinger 2021-04-01 16:18:16 +11:00
parent dbe03ba1cf
commit 958e5b12bc
No known key found for this signature in database
GPG Key ID: 651AC83A6C6C8B96
1 changed files with 17 additions and 24 deletions
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41
swap/src/protocol/alice/swap.rs
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@ -146,33 +146,26 @@ async fn next_state(
} => {
let tx_lock_status = bitcoin_wallet.subscribe_to(state3.tx_lock.clone()).await;
match state3.expired_timelocks(bitcoin_wallet).await? {
ExpiredTimelocks::None => {
select! {
_ = tx_lock_status.wait_until_confirmed_with(state3.cancel_timelock) => {
AliceState::CancelTimelockExpired {
monero_wallet_restore_blockheight,
transfer_proof,
state3,
}
}
enc_sig = event_loop_handle.recv_encrypted_signature() => {
tracing::info!("Received encrypted signature");
select! {
biased; // make sure the cancel timelock expiry future is polled first
AliceState::EncSigLearned {
monero_wallet_restore_blockheight,
transfer_proof,
encrypted_signature: Box::new(enc_sig?),
state3,
}
}
_ = tx_lock_status.wait_until_confirmed_with(state3.cancel_timelock) => {
AliceState::CancelTimelockExpired {
monero_wallet_restore_blockheight,
transfer_proof,
state3,
}
}
enc_sig = event_loop_handle.recv_encrypted_signature() => {
tracing::info!("Received encrypted signature");
AliceState::EncSigLearned {
monero_wallet_restore_blockheight,
transfer_proof,
encrypted_signature: Box::new(enc_sig?),
state3,
}
}
_ => AliceState::CancelTimelockExpired {
monero_wallet_restore_blockheight,
transfer_proof,
state3,
},
}
}
AliceState::EncSigLearned {