Set extra skimmed fee on intercepted forward

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

diff --git a/lightning/src/chain/chaininterface.rs b/lightning/src/chain/chaininterface.rs
index 02961f2dc71a84d5b1d4a54225072e60cad9d482..d875dcce3e128c1443a2deaa46f1a8465a7cd06b 100644 (file)
--- a/lightning/src/chain/chaininterface.rs
+++ b/lightning/src/chain/chaininterface.rs
@@ -19,13 +19,25 @@ use bitcoin::blockdata::transaction::Transaction;
 
 /// An interface to send a transaction to the Bitcoin network.
 pub trait BroadcasterInterface {
-       /// Sends a transaction out to (hopefully) be mined.
-       fn broadcast_transaction(&self, tx: &Transaction);
+       /// Sends a list of transactions out to (hopefully) be mined.
+       /// This only needs to handle the actual broadcasting of transactions, LDK will automatically
+       /// rebroadcast transactions that haven't made it into a block.
+       ///
+       /// In some cases LDK may attempt to broadcast a transaction which double-spends another
+       /// and this isn't a bug and can be safely ignored.
+       ///
+       /// If more than one transaction is given, these transactions should be considered to be a
+       /// package and broadcast together. Some of the transactions may or may not depend on each other,
+       /// be sure to manage both cases correctly.
+       ///
+       /// Bitcoin transaction packages are defined in BIP 331 and here:
+       /// https://github.com/bitcoin/bitcoin/blob/master/doc/policy/packages.md
+       fn broadcast_transactions(&self, txs: &[&Transaction]);
 }
 
 /// An enum that represents the speed at which we want a transaction to confirm used for feerate
 /// estimation.
-#[derive(Clone, Copy, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
 pub enum ConfirmationTarget {
        /// We are happy with this transaction confirming slowly when feerate drops some.
        Background,
@@ -46,30 +58,24 @@ pub trait FeeEstimator {
        /// LDK will wrap this method and ensure that the value returned is no smaller than 253
        /// (ie 1 satoshi-per-byte rounded up to ensure later round-downs don't put us below 1 satoshi-per-byte).
        ///
-       /// The following unit conversions can be used to convert to sats/KW. Note that it is not
-       /// necessary to use max() as the minimum of 253 will be enforced by LDK:
-       ///  * max(satoshis-per-byte * 250, 253)
-       ///  * max(satoshis-per-kbyte / 4, 253)
+       /// The following unit conversions can be used to convert to sats/KW:
+       ///  * satoshis-per-byte * 250
+       ///  * satoshis-per-kbyte / 4
        fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32;
 }
 
-// We need `FeeEstimator` implemented so that in some places where we only have a shared
-// reference to a `Deref` to a `FeeEstimator`, we can still wrap it.
-impl<D: Deref> FeeEstimator for D where D::Target: FeeEstimator {
-       fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32 {
-               (**self).get_est_sat_per_1000_weight(confirmation_target)
-       }
-}
-
 /// Minimum relay fee as required by bitcoin network mempool policy.
 pub const MIN_RELAY_FEE_SAT_PER_1000_WEIGHT: u64 = 4000;
 /// Minimum feerate that takes a sane approach to bitcoind weight-to-vbytes rounding.
 /// See the following Core Lightning commit for an explanation:
-/// https://github.com/ElementsProject/lightning/commit/2e687b9b352c9092b5e8bd4a688916ac50b44af0
+/// <https://github.com/ElementsProject/lightning/commit/2e687b9b352c9092b5e8bd4a688916ac50b44af0>
 pub const FEERATE_FLOOR_SATS_PER_KW: u32 = 253;
 
 /// Wraps a `Deref` to a `FeeEstimator` so that any fee estimations provided by it
-/// are bounded below by `FEERATE_FLOOR_SATS_PER_KW` (253 sats/KW)
+/// are bounded below by `FEERATE_FLOOR_SATS_PER_KW` (253 sats/KW).
+///
+/// Note that this does *not* implement [`FeeEstimator`] to make it harder to accidentally mix the
+/// two.
 pub(crate) struct LowerBoundedFeeEstimator<F: Deref>(pub F) where F::Target: FeeEstimator;
 
 impl<F: Deref> LowerBoundedFeeEstimator<F> where F::Target: FeeEstimator {
@@ -78,7 +84,7 @@ impl<F: Deref> LowerBoundedFeeEstimator<F> where F::Target: FeeEstimator {
                LowerBoundedFeeEstimator(fee_estimator)
        }
 
-       pub fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32 {
+       pub fn bounded_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32 {
                cmp::max(
                        self.0.get_est_sat_per_1000_weight(confirmation_target),
                        FEERATE_FLOOR_SATS_PER_KW,
@@ -106,7 +112,7 @@ mod tests {
                let test_fee_estimator = &TestFeeEstimator { sat_per_kw };
                let fee_estimator = LowerBoundedFeeEstimator::new(test_fee_estimator);
 
-               assert_eq!(fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background), FEERATE_FLOOR_SATS_PER_KW);
+               assert_eq!(fee_estimator.bounded_sat_per_1000_weight(ConfirmationTarget::Background), FEERATE_FLOOR_SATS_PER_KW);
        }
 
        #[test]
@@ -115,6 +121,6 @@ mod tests {
                let test_fee_estimator = &TestFeeEstimator { sat_per_kw };
                let fee_estimator = LowerBoundedFeeEstimator::new(test_fee_estimator);
 
-               assert_eq!(fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background), sat_per_kw);
+               assert_eq!(fee_estimator.bounded_sat_per_1000_weight(ConfirmationTarget::Background), sat_per_kw);
        }
 }