From bf0776e3dd8f457ec5c4b368d05ffb09d2cda20d Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <me@tobin.cc>
Date: Mon, 26 May 2025 07:37:51 +0100
Subject: [PATCH] Remove panic using checked arithmetic

During dev I introduced a pancic, remove it.
---
 units/src/fee.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/units/src/fee.rs b/units/src/fee.rs
index f8a693351..63a75cbfb 100644
--- a/units/src/fee.rs
+++ b/units/src/fee.rs
@@ -31,10 +31,14 @@ impl Amount {
             return None;
         }
 
-        let sats = self.to_sat() * 1_000; // Because we use per/kwu.
-        let fee_rate = sats / wu;
-
-        FeeRate::from_sat_per_kwu(fee_rate)
+        // Mul by 1,000 because we use per/kwu.
+        match self.to_sat().checked_mul(1_000) {
+            Some(sats) => {
+                let fee_rate = sats / wu;
+                FeeRate::from_sat_per_kwu(fee_rate)
+            }
+            None => None,
+        }
     }
 
     /// Checked weight ceiling division.