expose feerate_per_kw in ChannelDetails

lightning/src/ln/channelmanager.rs

@@ -1118,6 +1118,10 @@ pub struct ChannelDetails {
 	/// inbound. This may be zero for inbound channels serialized with LDK versions prior to
 	/// 0.0.113.
 	pub user_channel_id: u128,
+	/// The currently negotiated feerate per 1000-weight-unit applied to commitment and htlc txs
+	///
+	/// This value will be `None` for objects serialized with LDK versions prior to 0.0.115.
+	pub feerate_per_kw: Option<u32>,
 	/// Our total balance.  This is the amount we would get if we close the channel.
 	/// This value is not exact. Due to various in-flight changes and feerate changes, exactly this
 	/// amount is not likely to be recoverable on close.
@@ -1260,6 +1264,7 @@ impl ChannelDetails {
 			outbound_scid_alias: if channel.is_usable() { Some(channel.outbound_scid_alias()) } else { None },
 			inbound_scid_alias: channel.latest_inbound_scid_alias(),
 			channel_value_satoshis: channel.get_value_satoshis(),
+			feerate_per_kw: Some(channel.get_feerate()),
 			unspendable_punishment_reserve: to_self_reserve_satoshis,
 			balance_msat: balance.balance_msat,
 			inbound_capacity_msat: balance.inbound_capacity_msat,
@@ -6570,6 +6575,7 @@ impl Writeable for ChannelDetails {
 			(33, self.inbound_htlc_minimum_msat, option),
 			(35, self.inbound_htlc_maximum_msat, option),
 			(37, user_channel_id_high_opt, option),
+			(39, self.feerate_per_kw, option),
 		});
 		Ok(())
 	}
@@ -6605,6 +6611,7 @@ impl Readable for ChannelDetails {
 			(33, inbound_htlc_minimum_msat, option),
 			(35, inbound_htlc_maximum_msat, option),
 			(37, user_channel_id_high_opt, option),
+			(39, feerate_per_kw, option),
 		});
 
 		// `user_channel_id` used to be a single u64 value. In order to remain backwards compatible with
@@ -6638,6 +6645,7 @@ impl Readable for ChannelDetails {
 			is_public: is_public.0.unwrap(),
 			inbound_htlc_minimum_msat,
 			inbound_htlc_maximum_msat,
+			feerate_per_kw,
 		})
 	}
 }

lightning/src/routing/router.rs

@@ -2208,6 +2208,7 @@ mod tests {
 			inbound_htlc_minimum_msat: None,
 			inbound_htlc_maximum_msat: None,
 			config: None,
+			feerate_per_kw: None
 		}
 	}
 
@@ -5737,6 +5738,7 @@ mod benches {
 			inbound_htlc_minimum_msat: None,
 			inbound_htlc_maximum_msat: None,
 			config: None,
+			feerate_per_kw: None,
 		}
 	}