X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fchain%2Fchaininterface.rs;h=54cd3381209d2579667ee33e1c2de8a89c86a420;hb=ba8af2280de6ee906f4d3cc5185884d9faf31e66;hp=d875dcce3e128c1443a2deaa46f1a8465a7cd06b;hpb=0d3adb8fa08474b6d893a373b78e0195d061cfe6;p=rust-lightning

diff --git a/lightning/src/chain/chaininterface.rs b/lightning/src/chain/chaininterface.rs
index d875dcce..54cd3381 100644
--- a/lightning/src/chain/chaininterface.rs
+++ b/lightning/src/chain/chaininterface.rs
@@ -14,9 +14,18 @@
 //! disconnections, transaction broadcasting, and feerate information requests.
 
 use core::{cmp, ops::Deref};
+use core::convert::TryInto;
 
 use bitcoin::blockdata::transaction::Transaction;
 
+// TODO: Define typed abstraction over feerates to handle their conversions.
+pub(crate) fn compute_feerate_sat_per_1000_weight(fee_sat: u64, weight: u64) -> u32 {
+	(fee_sat * 1000 / weight).try_into().unwrap_or(u32::max_value())
+}
+pub(crate) const fn fee_for_weight(feerate_sat_per_1000_weight: u32, weight: u64) -> u64 {
+	((feerate_sat_per_1000_weight as u64 * weight) + 1000 - 1) / 1000
+}
+
 /// An interface to send a transaction to the Bitcoin network.
 pub trait BroadcasterInterface {
 	/// Sends a list of transactions out to (hopefully) be mined.