1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! A very simple serialization framework which is used to serialize/deserialize messages as well
11 //! as [`ChannelManager`]s and [`ChannelMonitor`]s.
13 //! [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
14 //! [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
16 use crate::prelude::*;
17 use crate::io::{self, Read, Seek, Write};
18 use crate::io_extras::{copy, sink};
20 use crate::sync::Mutex;
22 use core::convert::TryFrom;
25 use alloc::collections::BTreeMap;
27 use bitcoin::secp256k1::{PublicKey, SecretKey};
28 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE, SCHNORR_SIGNATURE_SIZE};
29 use bitcoin::secp256k1::ecdsa;
30 use bitcoin::secp256k1::schnorr;
31 use bitcoin::blockdata::constants::ChainHash;
32 use bitcoin::blockdata::script::Script;
33 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
34 use bitcoin::consensus;
35 use bitcoin::consensus::Encodable;
36 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
37 use bitcoin::hash_types::{Txid, BlockHash};
38 use core::marker::Sized;
39 use core::time::Duration;
40 use crate::ln::msgs::DecodeError;
41 use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
43 use crate::util::byte_utils::{be48_to_array, slice_to_be48};
45 /// serialization buffer size
46 pub const MAX_BUF_SIZE: usize = 64 * 1024;
48 /// A simplified version of [`std::io::Write`] that exists largely for backwards compatibility.
49 /// An impl is provided for any type that also impls [`std::io::Write`].
51 /// (C-not exported) as we only export serialization to/from byte arrays instead
53 /// Writes the given buf out. See std::io::Write::write_all for more
54 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
57 impl<W: Write> Writer for W {
59 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
60 <Self as io::Write>::write_all(self, buf)
64 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
65 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
67 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
71 fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
72 self.0.write_all(buf)?;
76 fn flush(&mut self) -> Result<(), io::Error> {
81 pub(crate) struct VecWriter(pub Vec<u8>);
82 impl Writer for VecWriter {
84 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
85 self.0.extend_from_slice(buf);
90 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
91 /// of some data when serialized but don't yet need the full data.
92 pub struct LengthCalculatingWriter(pub usize);
93 impl Writer for LengthCalculatingWriter {
95 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
101 /// Essentially [`std::io::Take`] but a bit simpler and with a method to walk the underlying stream
102 /// forward to ensure we always consume exactly the fixed length specified.
103 pub struct FixedLengthReader<R: Read> {
108 impl<R: Read> FixedLengthReader<R> {
109 /// Returns a new [`FixedLengthReader`].
110 pub fn new(read: R, total_bytes: u64) -> Self {
111 Self { read, bytes_read: 0, total_bytes }
114 /// Returns whether some bytes are remaining or not.
116 pub fn bytes_remain(&mut self) -> bool {
117 self.bytes_read != self.total_bytes
120 /// Consumes the remaining bytes.
122 pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
123 copy(self, &mut sink()).unwrap();
124 if self.bytes_read != self.total_bytes {
125 Err(DecodeError::ShortRead)
131 impl<R: Read> Read for FixedLengthReader<R> {
133 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
134 if self.total_bytes == self.bytes_read {
137 let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
138 match self.read.read(&mut dest[0..(read_len as usize)]) {
140 self.bytes_read += v as u64;
149 impl<R: Read> LengthRead for FixedLengthReader<R> {
151 fn total_bytes(&self) -> u64 {
156 /// A [`Read`] implementation which tracks whether any bytes have been read at all. This allows us to distinguish
157 /// between "EOF reached before we started" and "EOF reached mid-read".
158 pub struct ReadTrackingReader<R: Read> {
160 /// Returns whether we have read from this reader or not yet.
163 impl<R: Read> ReadTrackingReader<R> {
164 /// Returns a new [`ReadTrackingReader`].
165 pub fn new(read: R) -> Self {
166 Self { read, have_read: false }
169 impl<R: Read> Read for ReadTrackingReader<R> {
171 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
172 match self.read.read(dest) {
175 self.have_read = true;
183 /// A trait that various LDK types implement allowing them to be written out to a [`Writer`].
185 /// (C-not exported) as we only export serialization to/from byte arrays instead
186 pub trait Writeable {
187 /// Writes `self` out to the given [`Writer`].
188 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
190 /// Writes `self` out to a `Vec<u8>`.
191 fn encode(&self) -> Vec<u8> {
192 let mut msg = VecWriter(Vec::new());
193 self.write(&mut msg).unwrap();
197 /// Writes `self` out to a `Vec<u8>`.
199 fn encode_with_len(&self) -> Vec<u8> {
200 let mut msg = VecWriter(Vec::new());
201 0u16.write(&mut msg).unwrap();
202 self.write(&mut msg).unwrap();
203 let len = msg.0.len();
204 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
208 /// Gets the length of this object after it has been serialized. This can be overridden to
209 /// optimize cases where we prepend an object with its length.
210 // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
212 fn serialized_length(&self) -> usize {
213 let mut len_calc = LengthCalculatingWriter(0);
214 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
219 impl<'a, T: Writeable> Writeable for &'a T {
220 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
223 /// A trait that various LDK types implement allowing them to be read in from a [`Read`].
225 /// (C-not exported) as we only export serialization to/from byte arrays instead
229 /// Reads a `Self` in from the given [`Read`].
230 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
233 /// A trait that various LDK types implement allowing them to be read in from a
234 /// [`Read`]` + `[`Seek`].
235 pub(crate) trait SeekReadable where Self: Sized {
236 /// Reads a `Self` in from the given [`Read`].
237 fn read<R: Read + Seek>(reader: &mut R) -> Result<Self, DecodeError>;
240 /// A trait that various higher-level LDK types implement allowing them to be read in
241 /// from a [`Read`] given some additional set of arguments which is required to deserialize.
243 /// (C-not exported) as we only export serialization to/from byte arrays instead
244 pub trait ReadableArgs<P>
247 /// Reads a `Self` in from the given [`Read`].
248 fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
251 /// A [`std::io::Read`] that also provides the total bytes available to be read.
252 pub(crate) trait LengthRead: Read {
253 /// The total number of bytes available to be read.
254 fn total_bytes(&self) -> u64;
257 /// A trait that various higher-level LDK types implement allowing them to be read in
258 /// from a Read given some additional set of arguments which is required to deserialize, requiring
259 /// the implementer to provide the total length of the read.
260 pub(crate) trait LengthReadableArgs<P> where Self: Sized
262 /// Reads a `Self` in from the given [`LengthRead`].
263 fn read<R: LengthRead>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
266 /// A trait that various higher-level LDK types implement allowing them to be read in
267 /// from a [`Read`], requiring the implementer to provide the total length of the read.
268 pub(crate) trait LengthReadable where Self: Sized
270 /// Reads a `Self` in from the given [`LengthRead`].
271 fn read<R: LengthRead>(reader: &mut R) -> Result<Self, DecodeError>;
274 /// A trait that various LDK types implement allowing them to (maybe) be read in from a [`Read`].
276 /// (C-not exported) as we only export serialization to/from byte arrays instead
277 pub trait MaybeReadable
280 /// Reads a `Self` in from the given [`Read`].
281 fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
284 impl<T: Readable> MaybeReadable for T {
286 fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
287 Ok(Some(Readable::read(reader)?))
291 /// Wrapper to read a required (non-optional) TLV record.
292 pub struct OptionDeserWrapper<T: Readable>(pub Option<T>);
293 impl<T: Readable> Readable for OptionDeserWrapper<T> {
295 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
296 Ok(Self(Some(Readable::read(reader)?)))
299 /// When handling `default_values`, we want to map the default-value T directly
300 /// to a `OptionDeserWrapper<T>` in a way that works for `field: T = t;` as
301 /// well. Thus, we assume `Into<T> for T` does nothing and use that.
302 impl<T: Readable> From<T> for OptionDeserWrapper<T> {
303 fn from(t: T) -> OptionDeserWrapper<T> { OptionDeserWrapper(Some(t)) }
306 pub(crate) struct U48(pub u64);
307 impl Writeable for U48 {
309 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
310 writer.write_all(&be48_to_array(self.0))
313 impl Readable for U48 {
315 fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
316 let mut buf = [0; 6];
317 reader.read_exact(&mut buf)?;
318 Ok(U48(slice_to_be48(&buf)))
322 /// Lightning TLV uses a custom variable-length integer called `BigSize`. It is similar to Bitcoin's
323 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
325 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
326 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
327 /// you're looking for an example of a variable-length integer to use for your own project, move
328 /// along, this is a rather poor design.
329 pub struct BigSize(pub u64);
330 impl Writeable for BigSize {
332 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
335 (self.0 as u8).write(writer)
338 0xFDu8.write(writer)?;
339 (self.0 as u16).write(writer)
341 0x10000...0xFFFFFFFF => {
342 0xFEu8.write(writer)?;
343 (self.0 as u32).write(writer)
346 0xFFu8.write(writer)?;
347 (self.0 as u64).write(writer)
352 impl Readable for BigSize {
354 fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
355 let n: u8 = Readable::read(reader)?;
358 let x: u64 = Readable::read(reader)?;
360 Err(DecodeError::InvalidValue)
366 let x: u32 = Readable::read(reader)?;
368 Err(DecodeError::InvalidValue)
370 Ok(BigSize(x as u64))
374 let x: u16 = Readable::read(reader)?;
376 Err(DecodeError::InvalidValue)
378 Ok(BigSize(x as u64))
381 n => Ok(BigSize(n as u64))
386 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
387 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
388 /// encapsulates such integers implementing [`Readable`]/[`Writeable`] for them.
389 #[cfg_attr(test, derive(PartialEq, Eq, Debug))]
390 pub(crate) struct HighZeroBytesDroppedBigSize<T>(pub T);
392 macro_rules! impl_writeable_primitive {
393 ($val_type:ty, $len: expr) => {
394 impl Writeable for $val_type {
396 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
397 writer.write_all(&self.to_be_bytes())
400 impl Writeable for HighZeroBytesDroppedBigSize<$val_type> {
402 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
403 // Skip any full leading 0 bytes when writing (in BE):
404 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
407 impl Readable for $val_type {
409 fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
410 let mut buf = [0; $len];
411 reader.read_exact(&mut buf)?;
412 Ok(<$val_type>::from_be_bytes(buf))
415 impl Readable for HighZeroBytesDroppedBigSize<$val_type> {
417 fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedBigSize<$val_type>, DecodeError> {
418 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
419 // the high bytes being dropped. To do so, we start reading into the middle of buf
420 // and then convert the appropriate number of bytes with extra high bytes out of
422 let mut buf = [0; $len*2];
423 let mut read_len = reader.read(&mut buf[$len..])?;
424 let mut total_read_len = read_len;
425 while read_len != 0 && total_read_len != $len {
426 read_len = reader.read(&mut buf[($len + total_read_len)..])?;
427 total_read_len += read_len;
429 if total_read_len == 0 || buf[$len] != 0 {
430 let first_byte = $len - ($len - total_read_len);
431 let mut bytes = [0; $len];
432 bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
433 Ok(HighZeroBytesDroppedBigSize(<$val_type>::from_be_bytes(bytes)))
435 // If the encoding had extra zero bytes, return a failure even though we know
436 // what they meant (as the TLV test vectors require this)
437 Err(DecodeError::InvalidValue)
441 impl From<$val_type> for HighZeroBytesDroppedBigSize<$val_type> {
442 fn from(val: $val_type) -> Self { Self(val) }
447 impl_writeable_primitive!(u128, 16);
448 impl_writeable_primitive!(u64, 8);
449 impl_writeable_primitive!(u32, 4);
450 impl_writeable_primitive!(u16, 2);
452 impl Writeable for u8 {
454 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
455 writer.write_all(&[*self])
458 impl Readable for u8 {
460 fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
461 let mut buf = [0; 1];
462 reader.read_exact(&mut buf)?;
467 impl Writeable for bool {
469 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
470 writer.write_all(&[if *self {1} else {0}])
473 impl Readable for bool {
475 fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
476 let mut buf = [0; 1];
477 reader.read_exact(&mut buf)?;
478 if buf[0] != 0 && buf[0] != 1 {
479 return Err(DecodeError::InvalidValue);
486 macro_rules! impl_array {
488 impl Writeable for [u8; $size]
491 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
496 impl Readable for [u8; $size]
499 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
500 let mut buf = [0u8; $size];
501 r.read_exact(&mut buf)?;
508 impl_array!(3); // for rgb, ISO 4712 code
509 impl_array!(4); // for IPv4
510 impl_array!(12); // for OnionV2
511 impl_array!(16); // for IPv6
512 impl_array!(32); // for channel id & hmac
513 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
514 impl_array!(64); // for ecdsa::Signature and schnorr::Signature
515 impl_array!(1300); // for OnionPacket.hop_data
517 impl Writeable for [u16; 8] {
519 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
520 for v in self.iter() {
521 w.write_all(&v.to_be_bytes())?
527 impl Readable for [u16; 8] {
529 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
530 let mut buf = [0u8; 16];
531 r.read_exact(&mut buf)?;
532 let mut res = [0u16; 8];
533 for (idx, v) in res.iter_mut().enumerate() {
534 *v = (buf[idx] as u16) << 8 | (buf[idx + 1] as u16)
540 /// A type for variable-length values within TLV record where the length is encoded as part of the record.
541 /// Used to prevent encoding the length twice.
542 pub struct WithoutLength<T>(pub T);
544 impl Writeable for WithoutLength<&String> {
546 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
547 w.write_all(self.0.as_bytes())
550 impl Readable for WithoutLength<String> {
552 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
553 let v: WithoutLength<Vec<u8>> = Readable::read(r)?;
554 Ok(Self(String::from_utf8(v.0).map_err(|_| DecodeError::InvalidValue)?))
557 impl<'a> From<&'a String> for WithoutLength<&'a String> {
558 fn from(s: &'a String) -> Self { Self(s) }
561 impl<'a, T: Writeable> Writeable for WithoutLength<&'a Vec<T>> {
563 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
564 for ref v in self.0.iter() {
571 impl<T: MaybeReadable> Readable for WithoutLength<Vec<T>> {
573 fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
574 let mut values = Vec::new();
576 let mut track_read = ReadTrackingReader::new(&mut reader);
577 match MaybeReadable::read(&mut track_read) {
578 Ok(Some(v)) => { values.push(v); },
580 // If we failed to read any bytes at all, we reached the end of our TLV
581 // stream and have simply exhausted all entries.
582 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
583 Err(e) => return Err(e),
589 impl<'a, T> From<&'a Vec<T>> for WithoutLength<&'a Vec<T>> {
590 fn from(v: &'a Vec<T>) -> Self { Self(v) }
593 macro_rules! impl_for_map {
594 ($ty: ident, $keybound: ident, $constr: expr) => {
595 impl<K, V> Writeable for $ty<K, V>
596 where K: Writeable + Eq + $keybound, V: Writeable
599 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
600 (self.len() as u16).write(w)?;
601 for (key, value) in self.iter() {
609 impl<K, V> Readable for $ty<K, V>
610 where K: Readable + Eq + $keybound, V: MaybeReadable
613 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
614 let len: u16 = Readable::read(r)?;
615 let mut ret = $constr(len as usize);
618 let v_opt = V::read(r)?;
619 if let Some(v) = v_opt {
620 if ret.insert(k, v).is_some() {
621 return Err(DecodeError::InvalidValue);
631 impl_for_map!(BTreeMap, Ord, |_| BTreeMap::new());
632 impl_for_map!(HashMap, Hash, |len| HashMap::with_capacity(len));
635 impl<T> Writeable for HashSet<T>
636 where T: Writeable + Eq + Hash
639 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
640 (self.len() as u16).write(w)?;
641 for item in self.iter() {
648 impl<T> Readable for HashSet<T>
649 where T: Readable + Eq + Hash
652 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
653 let len: u16 = Readable::read(r)?;
654 let mut ret = HashSet::with_capacity(len as usize);
656 if !ret.insert(T::read(r)?) {
657 return Err(DecodeError::InvalidValue)
665 macro_rules! impl_for_vec {
666 ($ty: ty $(, $name: ident)*) => {
667 impl<$($name : Writeable),*> Writeable for Vec<$ty> {
669 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
670 (self.len() as u16).write(w)?;
671 for elem in self.iter() {
678 impl<$($name : Readable),*> Readable for Vec<$ty> {
680 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
681 let len: u16 = Readable::read(r)?;
682 let mut ret = Vec::with_capacity(cmp::min(len as usize, MAX_BUF_SIZE / core::mem::size_of::<$ty>()));
684 if let Some(val) = MaybeReadable::read(r)? {
694 impl Writeable for Vec<u8> {
696 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
697 (self.len() as u16).write(w)?;
702 impl Readable for Vec<u8> {
704 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
705 let len: u16 = Readable::read(r)?;
706 let mut ret = Vec::with_capacity(len as usize);
707 ret.resize(len as usize, 0);
708 r.read_exact(&mut ret)?;
713 impl_for_vec!(ecdsa::Signature);
714 impl_for_vec!((A, B), A, B);
716 impl Writeable for Script {
717 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
718 (self.len() as u16).write(w)?;
719 w.write_all(self.as_bytes())
723 impl Readable for Script {
724 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
725 let len = <u16 as Readable>::read(r)? as usize;
726 let mut buf = vec![0; len];
727 r.read_exact(&mut buf)?;
728 Ok(Script::from(buf))
732 impl Writeable for PublicKey {
733 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
734 self.serialize().write(w)
737 fn serialized_length(&self) -> usize {
742 impl Readable for PublicKey {
743 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
744 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
745 match PublicKey::from_slice(&buf) {
747 Err(_) => return Err(DecodeError::InvalidValue),
752 impl Writeable for SecretKey {
753 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
754 let mut ser = [0; SECRET_KEY_SIZE];
755 ser.copy_from_slice(&self[..]);
759 fn serialized_length(&self) -> usize {
764 impl Readable for SecretKey {
765 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
766 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
767 match SecretKey::from_slice(&buf) {
769 Err(_) => return Err(DecodeError::InvalidValue),
774 impl Writeable for Sha256dHash {
775 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
776 w.write_all(&self[..])
780 impl Readable for Sha256dHash {
781 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
782 use bitcoin::hashes::Hash;
784 let buf: [u8; 32] = Readable::read(r)?;
785 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
789 impl Writeable for ecdsa::Signature {
790 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
791 self.serialize_compact().write(w)
795 impl Readable for ecdsa::Signature {
796 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
797 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
798 match ecdsa::Signature::from_compact(&buf) {
800 Err(_) => return Err(DecodeError::InvalidValue),
805 impl Writeable for schnorr::Signature {
806 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
807 self.as_ref().write(w)
811 impl Readable for schnorr::Signature {
812 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
813 let buf: [u8; SCHNORR_SIGNATURE_SIZE] = Readable::read(r)?;
814 match schnorr::Signature::from_slice(&buf) {
816 Err(_) => return Err(DecodeError::InvalidValue),
821 impl Writeable for PaymentPreimage {
822 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
827 impl Readable for PaymentPreimage {
828 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
829 let buf: [u8; 32] = Readable::read(r)?;
830 Ok(PaymentPreimage(buf))
834 impl Writeable for PaymentHash {
835 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
840 impl Readable for PaymentHash {
841 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
842 let buf: [u8; 32] = Readable::read(r)?;
847 impl Writeable for PaymentSecret {
848 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
853 impl Readable for PaymentSecret {
854 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
855 let buf: [u8; 32] = Readable::read(r)?;
856 Ok(PaymentSecret(buf))
860 impl<T: Writeable> Writeable for Box<T> {
861 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
866 impl<T: Readable> Readable for Box<T> {
867 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
868 Ok(Box::new(Readable::read(r)?))
872 impl<T: Writeable> Writeable for Option<T> {
873 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
875 None => 0u8.write(w)?,
877 BigSize(data.serialized_length() as u64 + 1).write(w)?;
885 impl<T: Readable> Readable for Option<T>
887 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
888 let len: BigSize = Readable::read(r)?;
892 let mut reader = FixedLengthReader::new(r, len - 1);
893 Ok(Some(Readable::read(&mut reader)?))
899 impl Writeable for Txid {
900 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
901 w.write_all(&self[..])
905 impl Readable for Txid {
906 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
907 use bitcoin::hashes::Hash;
909 let buf: [u8; 32] = Readable::read(r)?;
910 Ok(Txid::from_slice(&buf[..]).unwrap())
914 impl Writeable for BlockHash {
915 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
916 w.write_all(&self[..])
920 impl Readable for BlockHash {
921 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
922 use bitcoin::hashes::Hash;
924 let buf: [u8; 32] = Readable::read(r)?;
925 Ok(BlockHash::from_slice(&buf[..]).unwrap())
929 impl Writeable for ChainHash {
930 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
931 w.write_all(self.as_bytes())
935 impl Readable for ChainHash {
936 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
937 let buf: [u8; 32] = Readable::read(r)?;
938 Ok(ChainHash::from(&buf[..]))
942 impl Writeable for OutPoint {
943 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
950 impl Readable for OutPoint {
951 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
952 let txid = Readable::read(r)?;
953 let vout = Readable::read(r)?;
961 macro_rules! impl_consensus_ser {
962 ($bitcoin_type: ty) => {
963 impl Writeable for $bitcoin_type {
964 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
965 match self.consensus_encode(&mut WriterWriteAdaptor(writer)) {
972 impl Readable for $bitcoin_type {
973 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
974 match consensus::encode::Decodable::consensus_decode(r) {
976 Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
977 Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
978 Err(_) => Err(DecodeError::InvalidValue),
984 impl_consensus_ser!(Transaction);
985 impl_consensus_ser!(TxOut);
987 impl<T: Readable> Readable for Mutex<T> {
988 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
989 let t: T = Readable::read(r)?;
993 impl<T: Writeable> Writeable for Mutex<T> {
994 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
995 self.lock().unwrap().write(w)
999 impl<A: Readable, B: Readable> Readable for (A, B) {
1000 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1001 let a: A = Readable::read(r)?;
1002 let b: B = Readable::read(r)?;
1006 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
1007 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1013 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
1014 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1015 let a: A = Readable::read(r)?;
1016 let b: B = Readable::read(r)?;
1017 let c: C = Readable::read(r)?;
1021 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
1022 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1029 impl Writeable for () {
1030 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
1034 impl Readable for () {
1035 fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
1040 impl Writeable for String {
1042 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1043 (self.len() as u16).write(w)?;
1044 w.write_all(self.as_bytes())
1047 impl Readable for String {
1049 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1050 let v: Vec<u8> = Readable::read(r)?;
1051 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;
1056 /// Represents a hostname for serialization purposes.
1057 /// Only the character set and length will be validated.
1058 /// The character set consists of ASCII alphanumeric characters, hyphens, and periods.
1059 /// Its length is guaranteed to be representable by a single byte.
1060 /// This serialization is used by [`BOLT 7`] hostnames.
1062 /// [`BOLT 7`]: https://github.com/lightning/bolts/blob/master/07-routing-gossip.md
1063 #[derive(Clone, Debug, PartialEq, Eq)]
1064 pub struct Hostname(String);
1066 /// Returns the length of the hostname.
1067 pub fn len(&self) -> u8 {
1068 (&self.0).len() as u8
1071 impl Deref for Hostname {
1072 type Target = String;
1074 fn deref(&self) -> &Self::Target {
1078 impl From<Hostname> for String {
1079 fn from(hostname: Hostname) -> Self {
1083 impl TryFrom<Vec<u8>> for Hostname {
1086 fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
1087 if let Ok(s) = String::from_utf8(bytes) {
1088 Hostname::try_from(s)
1094 impl TryFrom<String> for Hostname {
1097 fn try_from(s: String) -> Result<Self, Self::Error> {
1098 if s.len() <= 255 && s.chars().all(|c|
1099 c.is_ascii_alphanumeric() ||
1109 impl Writeable for Hostname {
1111 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1112 self.len().write(w)?;
1113 w.write_all(self.as_bytes())
1116 impl Readable for Hostname {
1118 fn read<R: Read>(r: &mut R) -> Result<Hostname, DecodeError> {
1119 let len: u8 = Readable::read(r)?;
1120 let mut vec = Vec::with_capacity(len.into());
1121 vec.resize(len.into(), 0);
1122 r.read_exact(&mut vec)?;
1123 Hostname::try_from(vec).map_err(|_| DecodeError::InvalidValue)
1127 impl Writeable for Duration {
1129 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1130 self.as_secs().write(w)?;
1131 self.subsec_nanos().write(w)
1134 impl Readable for Duration {
1136 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1137 let secs = Readable::read(r)?;
1138 let nanos = Readable::read(r)?;
1139 Ok(Duration::new(secs, nanos))
1145 use core::convert::TryFrom;
1146 use crate::util::ser::{Readable, Hostname, Writeable};
1149 fn hostname_conversion() {
1150 assert_eq!(Hostname::try_from(String::from("a-test.com")).unwrap().as_str(), "a-test.com");
1152 assert!(Hostname::try_from(String::from("\"")).is_err());
1153 assert!(Hostname::try_from(String::from("$")).is_err());
1154 assert!(Hostname::try_from(String::from("⚡")).is_err());
1155 let mut large_vec = Vec::with_capacity(256);
1156 large_vec.resize(256, b'A');
1157 assert!(Hostname::try_from(String::from_utf8(large_vec).unwrap()).is_err());
1161 fn hostname_serialization() {
1162 let hostname = Hostname::try_from(String::from("test")).unwrap();
1163 let mut buf: Vec<u8> = Vec::new();
1164 hostname.write(&mut buf).unwrap();
1165 assert_eq!(Hostname::read(&mut buf.as_slice()).unwrap().as_str(), "test");