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Avoid redundant broadcast of local commitment transaction #1922

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Merged
merged 1 commit into from
Dec 19, 2022
Merged

Avoid redundant broadcast of local commitment transaction #1922

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11 changes: 11 additions & 0 deletions lightning/src/chain/channelmonitor.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2325,6 +2325,17 @@ impl<Signer: Sign> ChannelMonitorImpl<Signer> {
log_trace!(logger, "Updating ChannelMonitor: channel force closed, should broadcast: {}", should_broadcast);
self.lockdown_from_offchain = true;
if *should_broadcast {
// There's no need to broadcast our commitment transaction if we've seen one
// confirmed (even with 1 confirmation) as it'll be rejected as
// duplicate/conflicting.
let detected_funding_spend = self.funding_spend_confirmed.is_some() ||
self.onchain_events_awaiting_threshold_conf.iter().find(|event| match event.event {
OnchainEvent::FundingSpendConfirmation { .. } => true,
_ => false,
}).is_some();
if detected_funding_spend {
continue;
}
self.broadcast_latest_holder_commitment_txn(broadcaster, logger);
// If the channel supports anchor outputs, we'll need to emit an external
// event to be consumed such that a child transaction is broadcast with a
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