//! [BOLT #9]: https://github.com/lightningnetwork/lightning-rfc/blob/master/09-features.md
//! [messages]: crate::ln::msgs
+use io;
use prelude::*;
use core::{cmp, fmt};
+use core::hash::{Hash, Hasher};
use core::marker::PhantomData;
use bitcoin::bech32;
)*
];
}
+
+ impl alloc::fmt::Display for Features<$context> {
+ fn fmt(&self, fmt: &mut alloc::fmt::Formatter) -> Result<(), alloc::fmt::Error> {
+ $(
+ $(
+ fmt.write_fmt(format_args!("{}: {}, ", stringify!($required_feature),
+ if <$context as $required_feature>::requires_feature(&self.flags) { "required" }
+ else if <$context as $required_feature>::supports_feature(&self.flags) { "supported" }
+ else { "not supported" }))?;
+ )*
+ $(
+ fmt.write_fmt(format_args!("{}: {}, ", stringify!($optional_feature),
+ if <$context as $optional_feature>::requires_feature(&self.flags) { "required" }
+ else if <$context as $optional_feature>::supports_feature(&self.flags) { "supported" }
+ else { "not supported" }))?;
+ )*
+ )*
+ fmt.write_fmt(format_args!("unknown flags: {}",
+ if self.requires_unknown_bits() { "required" }
+ else if self.supports_unknown_bits() { "supported" } else { "none" }))
+ }
+ }
};
}
}
}
}
+impl<T: sealed::Context> Hash for Features<T> {
+ fn hash<H: Hasher>(&self, hasher: &mut H) {
+ self.flags.hash(hasher);
+ }
+}
impl<T: sealed::Context> PartialEq for Features<T> {
fn eq(&self, o: &Self) -> bool {
self.flags.eq(&o.flags)
impl InitFeatures {
/// Writes all features present up to, and including, 13.
- pub(crate) fn write_up_to_13<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ 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)?;
&self.flags
}
- pub(crate) fn requires_unknown_bits(&self) -> bool {
+ /// Returns true if this `Features` object contains unknown feature flags which are set as
+ /// "required".
+ pub fn requires_unknown_bits(&self) -> bool {
// Bitwise AND-ing with all even bits set except for known features will select required
// unknown features.
let byte_count = T::KNOWN_FEATURE_MASK.len();
pub(crate) fn requires_data_loss_protect(&self) -> bool {
<T as sealed::DataLossProtect>::requires_feature(&self.flags)
}
+ #[cfg(test)]
pub(crate) fn supports_data_loss_protect(&self) -> bool {
<T as sealed::DataLossProtect>::supports_feature(&self.flags)
}
}
impl<T: sealed::Context> Writeable for Features<T> {
- fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+ 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
}
impl<T: sealed::Context> Readable for Features<T> {
- fn read<R: ::std::io::Read>(r: &mut R) -> Result<Self, DecodeError> {
+ fn read<R: io::Read>(r: &mut R) -> Result<Self, DecodeError> {
let mut flags: Vec<u8> = Readable::read(r)?;
flags.reverse(); // Swap to little-endian
Ok(Self {