Convert fee API to per_kw instead of per_vb

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

diff --git a/src/chain/chaininterface.rs b/src/chain/chaininterface.rs
index 518b20b128c70a6143cdb15587b694fe2bd23585..7e9e9aeff05b902923703846337cc5c9b9666edd 100644 (file)
--- a/src/chain/chaininterface.rs
+++ b/src/chain/chaininterface.rs
@@ -57,7 +57,12 @@ pub enum ConfirmationTarget {
 /// called from inside the library in response to ChainListener events, P2P events, or timer
 /// events).
 pub trait FeeEstimator: Sync + Send {
-       fn get_est_sat_per_vbyte(&self, confirmation_target: ConfirmationTarget) -> u64;
+       /// Gets estimated satoshis of fee required per 1000 Weight-Units. This translates to:
+       ///  * satoshis-per-byte * 250
+       ///  * ceil(satoshis-per-kbyte / 4)
+       /// Must be 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).
+       fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u64;
 }
 
 /// Utility to capture some common parts of ChainWatchInterface implementors.