Return optional Transaction from register_output

[rust-lightning] / lightning / src / chain / mod.rs

diff --git a/lightning/src/chain/mod.rs b/lightning/src/chain/mod.rs
index 7d410b9b71dd116cbe22d2858e9664ec6bc14381..67ae5b347f9d94b029f93333fbb68dc6e23f9518 100644 (file)
--- a/lightning/src/chain/mod.rs
+++ b/lightning/src/chain/mod.rs
@@ -11,7 +11,7 @@
 
 use bitcoin::blockdata::block::{Block, BlockHeader};
 use bitcoin::blockdata::script::Script;
-use bitcoin::blockdata::transaction::TxOut;
+use bitcoin::blockdata::transaction::{Transaction, TxOut};
 use bitcoin::hash_types::{BlockHash, Txid};
 
 use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr, MonitorEvent};
@@ -131,7 +131,10 @@ pub trait Filter: Send + Sync {
 
        /// Registers interest in spends of a transaction output identified by `outpoint` having
        /// `script_pubkey` as the spending condition.
-       fn register_output(&self, outpoint: &OutPoint, script_pubkey: &Script);
+       ///
+       /// Optionally, returns any transaction dependent on the output. This is useful for Electrum
+       /// clients to facilitate registering in-block descendants.
+       fn register_output(&self, outpoint: &OutPoint, script_pubkey: &Script) -> Option<(usize, Transaction)>;
 }
 
 impl<T: Listen> Listen for std::ops::Deref<Target = T> {