f - Warn about calling features() in a hot code path

diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs
index b1e24627d9e0c06fa4901088e12a069524b474d6..08f499fb751837bf4ef4921897e8227325cc84e3 100644 (file)
--- a/lightning/src/routing/router.rs
+++ b/lightning/src/routing/router.rs
@@ -373,6 +373,7 @@ impl<'a> CandidateRouteHop<'a> {
                }
        }
 
+       // NOTE: This may copy bytes to so avoid calling it in a hot code path.
        fn features(&self) -> ChannelFeatures {
                match self {
                        CandidateRouteHop::FirstHop { details } => details.counterparty.features.to_context(),