Generate ClaimEvent for HolderFundingOutput inputs from anchor channels

[rust-lightning] / lightning / src / ln / chan_utils.rs

diff --git a/lightning/src/ln/chan_utils.rs b/lightning/src/ln/chan_utils.rs
index 69ca4fb83f954f946b1236c7239980c3de104b85..e1bceb3ce2447cce3006d04cc318e29ed25c63a6 100644 (file)
--- a/lightning/src/ln/chan_utils.rs
+++ b/lightning/src/ln/chan_utils.rs
@@ -727,6 +727,15 @@ pub fn get_anchor_redeemscript(funding_pubkey: &PublicKey) -> Script {
                .into_script()
 }
 
+#[cfg(anchors)]
+/// Locates the output with an anchor script paying to `funding_pubkey` within `commitment_tx`.
+pub(crate) fn get_anchor_output<'a>(commitment_tx: &'a Transaction, funding_pubkey: &PublicKey) -> Option<(u32, &'a TxOut)> {
+       let anchor_script = chan_utils::get_anchor_redeemscript(funding_pubkey).to_v0_p2wsh();
+       commitment_tx.output.iter().enumerate()
+               .find(|(_, txout)| txout.script_pubkey == anchor_script)
+               .map(|(idx, txout)| (idx as u32, txout))
+}
+
 /// Per-channel data used to build transactions in conjunction with the per-commitment data (CommitmentTransaction).
 /// The fields are organized by holder/counterparty.
 ///