Check if invoices contain unknown required features

[rust-lightning] / lightning / src / ln / features.rs

diff --git a/lightning/src/ln/features.rs b/lightning/src/ln/features.rs
index b90748aa87b7e5cd55bf0461244fd2c654feb7eb..c0eb8f68ac541c4ed5181713686141bd7d287139 100644 (file)
--- a/lightning/src/ln/features.rs
+++ b/lightning/src/ln/features.rs
@@ -22,6 +22,7 @@
 //! [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::marker::PhantomData;
@@ -383,7 +384,7 @@ pub type InvoiceFeatures = Features<sealed::InvoiceContext>;
 
 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)?;
@@ -547,7 +548,9 @@ impl<T: sealed::Context> Features<T> {
                &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();
@@ -692,7 +695,7 @@ impl<T: sealed::ShutdownAnySegwit> Features<T> {
 }
 
 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
@@ -703,7 +706,7 @@ impl<T: sealed::Context> Writeable for Features<T> {
 }
 
 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 {