Add ChannelDetails::next_splice_out_maximum_sat

Author: tankyleo

fuzz/src/router.rs

@@ -248,6 +248,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 							outbound_capacity_msat: capacity.saturating_mul(1000),
 							next_outbound_htlc_limit_msat: capacity.saturating_mul(1000),
 							next_outbound_htlc_minimum_msat: 0,
+							next_splice_out_maximum_sat: capacity,
 							inbound_htlc_minimum_msat: None,
 							inbound_htlc_maximum_msat: None,
 							config: None,

lightning/src/ln/channel_state.rs

@@ -399,6 +399,8 @@ pub struct ChannelDetails {
 	/// an upper-bound. This is intended for use when routing, allowing us to ensure we pick a
 	/// route which is valid.
 	pub next_outbound_htlc_minimum_msat: u64,
+	/// The maximum value of the next splice out from our channel balance.
+	pub next_splice_out_maximum_sat: u64,
 	/// The available inbound capacity for the remote peer to send HTLCs to us. This does not
 	/// include any pending HTLCs which are not yet fully resolved (and, thus, whose balance is not
 	/// available for inclusion in new inbound HTLCs).
@@ -583,6 +585,7 @@ impl ChannelDetails {
 			outbound_capacity_msat: balance.outbound_capacity_msat,
 			next_outbound_htlc_limit_msat: balance.next_outbound_htlc_limit_msat,
 			next_outbound_htlc_minimum_msat: balance.next_outbound_htlc_minimum_msat,
+			next_splice_out_maximum_sat: balance.next_splice_out_maximum_sat,
 			user_channel_id: context.get_user_id(),
 			confirmations_required: channel.minimum_depth(),
 			confirmations: Some(funding.get_funding_tx_confirmations(best_block_height)),
@@ -622,6 +625,7 @@ impl_writeable_tlv_based!(ChannelDetails, {
 	(20, inbound_capacity_msat, required),
 	(21, next_outbound_htlc_minimum_msat, (default_value, 0)),
 	(22, confirmations_required, option),
+	(23, next_splice_out_maximum_sat, (default_value, u64::from(outbound_capacity_msat.0.unwrap()) / 1000)),
 	(24, force_close_spend_delay, option),
 	(26, is_outbound, required),
 	(28, is_channel_ready, required),
@@ -726,6 +730,7 @@ mod tests {
 			outbound_capacity_msat: 24_300,
 			next_outbound_htlc_limit_msat: 20_000,
 			next_outbound_htlc_minimum_msat: 132,
+			next_splice_out_maximum_sat: 20,
 			inbound_capacity_msat: 42,
 			unspendable_punishment_reserve: Some(8273),
 			confirmations_required: Some(5),

lightning/src/routing/router.rs

@@ -4150,6 +4150,7 @@ mod tests {
 			outbound_capacity_msat,
 			next_outbound_htlc_limit_msat: outbound_capacity_msat,
 			next_outbound_htlc_minimum_msat: 0,
+			next_splice_out_maximum_sat: outbound_capacity_msat / 1000,
 			inbound_capacity_msat: 42,
 			unspendable_punishment_reserve: None,
 			confirmations_required: None,
@@ -9649,6 +9650,7 @@ pub(crate) mod bench_utils {
 			outbound_capacity_msat: 10_000_000_000,
 			next_outbound_htlc_minimum_msat: 0,
 			next_outbound_htlc_limit_msat: 10_000_000_000,
+			next_splice_out_maximum_sat: 10_000_000,
 			inbound_capacity_msat: 0,
 			unspendable_punishment_reserve: None,
 			confirmations_required: None,