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78 lines
3.1 KiB
78 lines
3.1 KiB
3 years ago
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use crate::bitcoin::{ExpiredTimelocks, Txid, Wallet};
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use crate::database::{Database, Swap};
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use crate::protocol::alice::AliceState;
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use anyhow::{bail, Result};
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use std::sync::Arc;
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use uuid::Uuid;
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#[derive(Debug, thiserror::Error, Clone, Copy)]
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pub enum Error {
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#[error("The cancel transaction cannot be published because the cancel timelock has not expired yet. Please try again later")]
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CancelTimelockNotExpiredYet,
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}
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pub async fn cancel(
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swap_id: Uuid,
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bitcoin_wallet: Arc<Wallet>,
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db: Arc<Database>,
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force: bool,
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) -> Result<Result<(Txid, AliceState), Error>> {
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let state = db.get_state(swap_id)?.try_into_alice()?.into();
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let (monero_wallet_restore_blockheight, transfer_proof, state3) = match state {
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// In case no XMR has been locked, move to Safely Aborted
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AliceState::Started { .. }
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| AliceState::BtcLocked { .. } => bail!("Cannot cancel swap {} because it is in state {} where no XMR was locked.", swap_id, state),
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AliceState::XmrLockTransactionSent { monero_wallet_restore_blockheight, transfer_proof, state3, }
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| AliceState::XmrLocked { monero_wallet_restore_blockheight, transfer_proof, state3 }
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| AliceState::XmrLockTransferProofSent { monero_wallet_restore_blockheight, transfer_proof, state3 }
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// in cancel mode we do not care about the fact that we could redeem, but always wait for cancellation (leading either refund or punish)
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| AliceState::EncSigLearned { monero_wallet_restore_blockheight, transfer_proof, state3, .. }
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| AliceState::CancelTimelockExpired { monero_wallet_restore_blockheight, transfer_proof, state3} => {
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(monero_wallet_restore_blockheight, transfer_proof, state3)
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}
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// The cancel tx was already published, but Alice not yet in final state
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AliceState::BtcCancelled { .. }
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| AliceState::BtcRefunded { .. }
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| AliceState::BtcPunishable { .. }
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// Alice already in final state
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| AliceState::BtcRedeemed
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| AliceState::XmrRefunded
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| AliceState::BtcPunished
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| AliceState::SafelyAborted => bail!("Cannot cancel swap {} because it is in state {} which is not cancelable", swap_id, state),
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};
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tracing::info!(%swap_id, "Trying to manually cancel swap");
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if !force {
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tracing::debug!(%swap_id, "Checking if cancel timelock is expired");
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if let ExpiredTimelocks::None = state3.expired_timelocks(bitcoin_wallet.as_ref()).await? {
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return Ok(Err(Error::CancelTimelockNotExpiredYet));
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}
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}
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let txid = if let Ok(tx) = state3.check_for_tx_cancel(bitcoin_wallet.as_ref()).await {
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let txid = tx.txid();
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tracing::debug!(%swap_id, "Cancel transaction has already been published: {}", txid);
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txid
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} else {
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state3.submit_tx_cancel(bitcoin_wallet.as_ref()).await?
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};
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let state = AliceState::BtcCancelled {
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monero_wallet_restore_blockheight,
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transfer_proof,
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state3,
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};
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let db_state = (&state).into();
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db.insert_latest_state(swap_id, Swap::Alice(db_state))
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.await?;
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Ok(Ok((txid, state)))
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}
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