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Replace sorting with slice pattern matching

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Sorting `psbt.output` by `witness_script` is at times pointless
because it might be set to `None`. To be more robust, we pattern
match against the produced transaction.
This commit is contained in:
Thomas Eizinger 2021-07-06 18:28:21 +10:00
parent 625ff4868a
commit 8b59ac26ba
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GPG Key ID: 651AC83A6C6C8B96
1 changed files with 12 additions and 15 deletions
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27
swap/src/bitcoin/wallet.rs
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@ -16,7 +16,6 @@ use reqwest::Url;
use rust_decimal::prelude::*;
use rust_decimal::Decimal;
use rust_decimal_macros::dec;
use std::cmp::Ordering;
use std::collections::{BTreeMap, HashMap};
use std::convert::TryFrom;
use std::fmt;
@ -326,22 +325,20 @@ where
let (psbt, _details) = tx_builder.finish()?;
let mut psbt: PartiallySignedTransaction = psbt;
// When subscribing to transactions we depend on the relevant script being at
// output index 0, thus we ensure the relevant output to be at index `0`.
psbt.outputs.sort_by(|a, _| {
if a.witness_script.as_ref() == Some(&script) {
Ordering::Less
} else {
Ordering::Greater
match psbt.global.unsigned_tx.output.as_mut_slice() {
// our primary output is the 2nd one? reverse the vectors
[_, second_txout] if second_txout.script_pubkey == script => {
psbt.outputs.reverse();
psbt.global.unsigned_tx.output.reverse();
}
});
psbt.global.unsigned_tx.output.sort_by(|a, _| {
if a.script_pubkey == script {
Ordering::Less
} else {
Ordering::Greater
[first_txout, _] if first_txout.script_pubkey == script => {
// no need to do anything
}
[_] => {
// single output, no need do anything
}
_ => bail!("Unexpected transaction layout"),
}
});
Ok(psbt)
}