/// Writes all features present up to, and including, 13.
pub(crate) fn write_up_to_13<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
let len = cmp::min(2, self.flags.len());
- w.size_hint(len + 2);
(len as u16).write(w)?;
for i in (0..len).rev() {
if i == 0 {
/// Getting a route for a keysend payment to a private node requires providing the payee's
/// features (since they were not announced in a node announcement). However, keysend payments
/// don't have an invoice to pull the payee's features from, so this method is provided for use in
- /// [`get_keysend_route`], thus omitting the need for payers to manually construct an
- /// `InvoiceFeatures` for [`get_route`].
+ /// [`Payee::for_keysend`], thus omitting the need for payers to manually construct an
+ /// `InvoiceFeatures` for [`find_route`].
///
- /// [`get_keysend_route`]: crate::routing::router::get_keysend_route
- /// [`get_route`]: crate::routing::router::get_route
+ /// [`Payee::for_keysend`]: crate::routing::router::Payee::for_keysend
+ /// [`find_route`]: crate::routing::router::find_route
pub(crate) fn for_keysend() -> InvoiceFeatures {
InvoiceFeatures::empty().set_variable_length_onion_optional()
}
(byte & unknown_features) != 0
})
}
-
- /// The number of bytes required to represent the feature flags present. This does not include
- /// the length bytes which are included in the serialized form.
- pub(crate) fn byte_count(&self) -> usize {
- self.flags.len()
- }
}
impl<T: sealed::DataLossProtect> Features<T> {
impl<T: sealed::Context> Writeable for Features<T> {
fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
- w.size_hint(self.flags.len() + 2);
(self.flags.len() as u16).write(w)?;
for f in self.flags.iter().rev() { // Swap back to big-endian
f.write(w)?;
#[test]
fn convert_to_context_with_unknown_flags() {
// Ensure the `from` context has fewer known feature bytes than the `to` context.
- assert!(InvoiceFeatures::known().byte_count() < NodeFeatures::known().byte_count());
+ assert!(InvoiceFeatures::known().flags.len() < NodeFeatures::known().flags.len());
let invoice_features = InvoiceFeatures::known().set_unknown_feature_optional();
assert!(invoice_features.supports_unknown_bits());
let node_features: NodeFeatures = invoice_features.to_context();