breez_sdk_liquid/recover/handlers/
mod.rs

1mod handle_chain_receive_swap;
2mod handle_chain_send_swap;
3mod handle_receive_swap;
4mod handle_send_swap;
5mod tests;
6
7use lwk_wollet::elements::Txid;
8
9pub(crate) use self::handle_chain_receive_swap::ChainReceiveSwapHandler;
10pub(crate) use self::handle_chain_send_swap::ChainSendSwapHandler;
11pub(crate) use self::handle_receive_swap::ReceiveSwapHandler;
12pub(crate) use self::handle_send_swap::SendSwapHandler;
13
14use super::model::TxMap;
15use crate::model::LBtcHistory;
16
17/// Helper function for determining lockup and claim transactions in incoming swaps
18pub(crate) fn determine_incoming_lockup_and_claim_txs(
19    history: &[LBtcHistory],
20    tx_map: &TxMap,
21) -> (Option<LBtcHistory>, Option<LBtcHistory>) {
22    match history.len() {
23        // Only lockup tx available
24        1 => (Some(history[0].clone()), None),
25        2 => {
26            let first = history[0].clone();
27            let second = history[1].clone();
28
29            if tx_map.incoming_tx_map.contains_key::<Txid>(&first.txid) {
30                // If the first tx is a known incoming tx, it's the claim tx and the second is the lockup
31                (Some(second), Some(first))
32            } else if tx_map.incoming_tx_map.contains_key::<Txid>(&second.txid) {
33                // If the second tx is a known incoming tx, it's the claim tx and the first is the lockup
34                (Some(first), Some(second))
35            } else {
36                // If none of the 2 txs is the claim tx, then the txs are lockup and swapper refund
37                // If so, we expect them to be confirmed at different heights
38                let first_conf_height = first.height;
39                let second_conf_height = second.height;
40                match (first.confirmed(), second.confirmed()) {
41                    // If they're both confirmed, the one with the lowest confirmation height is the lockup
42                    (true, true) => match first_conf_height < second_conf_height {
43                        true => (Some(first), None),
44                        false => (Some(second), None),
45                    },
46
47                    // If only one tx is confirmed, then that is the lockup
48                    (true, false) => (Some(first), None),
49                    (false, true) => (Some(second), None),
50
51                    // If neither is confirmed, this is an edge-case, and the most likely cause is an
52                    // out of date wallet tx_map that doesn't yet include one of the txs.
53                    (false, false) => {
54                        log::warn!(
55                            "Found 2 unconfirmed txs in the claim script history. \
56                          Unable to determine if they include a swapper refund or a user claim"
57                        );
58                        (None, None)
59                    }
60                }
61            }
62        }
63        n => {
64            log::warn!("Unexpected script history length {n} while recovering data for swap");
65            (None, None)
66        }
67    }
68}
breez_sdk_liquid/recover/handlers/mod.rs

breez_sdk_liquid/recover/handlers/
mod.rs
