Define `ChannelTypeFeatures` methods for anchors logic.

Specifically, introduce a new constructor for an anchors-
supporting feature set, as well as methods that will
maintain forwards-compatible deserialization in older
versions.

diff --git a/lightning/src/ln/features.rs b/lightning/src/ln/features.rs
index 3e3484e7372fc4a9ee59adaa01eb35badec11416..714bfaa5528fab5a5144cd9e54b827bb7de3b422 100644 (file)
--- a/lightning/src/ln/features.rs
+++ b/lightning/src/ln/features.rs
@@ -594,6 +594,15 @@ impl ChannelTypeFeatures {
                <sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
                ret
        }
+
+       #[cfg(any(anchors, test))]
+       /// Constructs a ChannelTypeFeatures with anchors support
+       pub(crate) fn anchors_zero_htlc_fee_and_dependencies() -> Self {
+               let mut ret = Self::empty();
+               <sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
+               <sealed::ChannelTypeContext as sealed::AnchorsZeroFeeHtlcTx>::set_required_bit(&mut ret.flags);
+               ret
+       }
 }
 
 impl ToBase32 for InvoiceFeatures {