}
impl ChannelTypeFeatures {
- /// Constructs the implicit channel type based on the common supported types between us and our
- /// counterparty
- pub(crate) fn from_counterparty_init(counterparty_init: &InitFeatures) -> Self {
- let mut ret = counterparty_init.to_context_internal();
+ // Maps the relevant `InitFeatures` to `ChannelTypeFeatures`. Any unknown features to
+ // `ChannelTypeFeatures` are not included in the result.
+ pub(crate) fn from_init(init: &InitFeatures) -> Self {
+ let mut ret = init.to_context_internal();
// ChannelTypeFeatures must only contain required bits, so we OR the required forms of all
// optional bits and then AND out the optional ones.
for byte in ret.flags.iter_mut() {
(byte & unknown_features) != 0
})
}
+
+ // Returns true if the features within `self` are a subset of the features within `other`.
+ pub(crate) fn is_subset(&self, other: &Self) -> bool {
+ for (idx, byte) in self.flags.iter().enumerate() {
+ if let Some(other_byte) = other.flags.get(idx) {
+ if byte & other_byte != *byte {
+ // `self` has bits set that `other` doesn't.
+ return false;
+ }
+ } else {
+ if *byte > 0 {
+ // `self` has a non-zero byte that `other` doesn't.
+ return false;
+ }
+ }
+ }
+ true
+ }
}
impl<T: sealed::UpfrontShutdownScript> Features<T> {
}
}
+impl<T: sealed::SCIDPrivacy> Features<T> {
+ pub(crate) fn clear_scid_privacy(&mut self) {
+ <T as sealed::SCIDPrivacy>::clear_bits(&mut self.flags);
+ }
+}
+
+impl<T: sealed::AnchorsZeroFeeHtlcTx> Features<T> {
+ pub(crate) fn clear_anchors_zero_fee_htlc_tx(&mut self) {
+ <T as sealed::AnchorsZeroFeeHtlcTx>::clear_bits(&mut self.flags);
+ }
+}
+
#[cfg(test)]
impl<T: sealed::UnknownFeature> Features<T> {
pub(crate) fn unknown() -> Self {
init_features.set_channel_type_optional();
init_features.set_scid_privacy_optional();
init_features.set_zero_conf_optional();
+ init_features.set_anchors_zero_fee_htlc_tx_optional();
assert!(init_features.initial_routing_sync());
assert!(!init_features.supports_upfront_shutdown_script());
// required-StaticRemoteKey ChannelTypeFeatures.
let mut init_features = InitFeatures::empty();
init_features.set_static_remote_key_optional();
- let converted_features = ChannelTypeFeatures::from_counterparty_init(&init_features);
+ let converted_features = ChannelTypeFeatures::from_init(&init_features);
assert_eq!(converted_features, ChannelTypeFeatures::only_static_remote_key());
assert!(!converted_features.supports_any_optional_bits());
assert!(converted_features.requires_static_remote_key());