Use `crate::prelude::*` rather than specific imports

[rust-lightning] / lightning / src / util / ser.rs

diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index f333fa2bac27f5182e4122a5321e684fc83a08ab..f88d9f36a72832ef1161c4ff65b48abb9e66a14a 100644 (file)
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -19,7 +19,6 @@ use crate::io_extras::{copy, sink};
 use core::hash::Hash;
 use crate::sync::{Mutex, RwLock};
 use core::cmp;
-use core::convert::TryFrom;
 use core::ops::Deref;
 
 use alloc::collections::BTreeMap;
@@ -35,7 +34,6 @@ use bitcoin::{consensus, Witness};
 use bitcoin::consensus::Encodable;
 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::hash_types::{Txid, BlockHash};
-use core::marker::Sized;
 use core::time::Duration;
 use crate::chain::ClaimId;
 use crate::ln::msgs::DecodeError;
@@ -820,6 +818,49 @@ macro_rules! impl_for_vec {
        }
 }
 
+// Alternatives to impl_writeable_for_vec/impl_readable_for_vec that add a length prefix to each
+// element in the Vec. Intended to be used when elements have variable lengths.
+macro_rules! impl_writeable_for_vec_with_element_length_prefix {
+       ($ty: ty $(, $name: ident)*) => {
+               impl<$($name : Writeable),*> Writeable for Vec<$ty> {
+                       #[inline]
+                       fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+                               CollectionLength(self.len() as u64).write(w)?;
+                               for elem in self.iter() {
+                                       CollectionLength(elem.serialized_length() as u64).write(w)?;
+                                       elem.write(w)?;
+                               }
+                               Ok(())
+                       }
+               }
+       }
+}
+macro_rules! impl_readable_for_vec_with_element_length_prefix {
+       ($ty: ty $(, $name: ident)*) => {
+               impl<$($name : Readable),*> Readable for Vec<$ty> {
+                       #[inline]
+                       fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+                               let len: CollectionLength = Readable::read(r)?;
+                               let mut ret = Vec::with_capacity(cmp::min(len.0 as usize, MAX_BUF_SIZE / core::mem::size_of::<$ty>()));
+                               for _ in 0..len.0 {
+                                       let elem_len: CollectionLength = Readable::read(r)?;
+                                       let mut elem_reader = FixedLengthReader::new(r, elem_len.0);
+                                       if let Some(val) = MaybeReadable::read(&mut elem_reader)? {
+                                               ret.push(val);
+                                       }
+                               }
+                               Ok(ret)
+                       }
+               }
+       }
+}
+macro_rules! impl_for_vec_with_element_length_prefix {
+       ($ty: ty $(, $name: ident)*) => {
+               impl_writeable_for_vec_with_element_length_prefix!($ty $(, $name)*);
+               impl_readable_for_vec_with_element_length_prefix!($ty $(, $name)*);
+       }
+}
+
 impl Writeable for Vec<u8> {
        #[inline]
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
@@ -851,6 +892,8 @@ impl_for_vec!(crate::ln::msgs::SocketAddress);
 impl_for_vec!((A, B), A, B);
 impl_writeable_for_vec!(&crate::routing::router::BlindedTail);
 impl_readable_for_vec!(crate::routing::router::BlindedTail);
+impl_for_vec_with_element_length_prefix!(crate::ln::msgs::UpdateAddHTLC);
+impl_writeable_for_vec_with_element_length_prefix!(&crate::ln::msgs::UpdateAddHTLC);
 
 impl Writeable for Vec<Witness> {
        #[inline]
@@ -1449,10 +1492,10 @@ impl Readable for ClaimId {
 
 #[cfg(test)]
 mod tests {
-       use core::convert::TryFrom;
        use bitcoin::hashes::hex::FromHex;
        use bitcoin::secp256k1::ecdsa;
        use crate::util::ser::{Readable, Hostname, Writeable};
+       use crate::prelude::*;
 
        #[test]
        fn hostname_conversion() {