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 ChannelsManagers and ChannelMonitors.
14 use io::{self, Read, Write};
15 use io_extras::{copy, sink};
19 use core::convert::TryFrom;
22 use bitcoin::secp256k1::{PublicKey, SecretKey};
23 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
24 use bitcoin::secp256k1::ecdsa::Signature;
25 use bitcoin::blockdata::script::Script;
26 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
27 use bitcoin::consensus;
28 use bitcoin::consensus::Encodable;
29 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
30 use bitcoin::hash_types::{Txid, BlockHash};
31 use core::marker::Sized;
32 use core::time::Duration;
33 use ln::msgs::DecodeError;
34 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
36 use util::byte_utils::{be48_to_array, slice_to_be48};
38 /// serialization buffer size
39 pub const MAX_BUF_SIZE: usize = 64 * 1024;
41 /// A simplified version of std::io::Write that exists largely for backwards compatibility.
42 /// An impl is provided for any type that also impls std::io::Write.
44 /// (C-not exported) as we only export serialization to/from byte arrays instead
46 /// Writes the given buf out. See std::io::Write::write_all for more
47 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
50 impl<W: Write> Writer for W {
52 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
53 <Self as io::Write>::write_all(self, buf)
57 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
58 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
60 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
64 fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
65 self.0.write_all(buf)?;
69 fn flush(&mut self) -> Result<(), io::Error> {
74 pub(crate) struct VecWriter(pub Vec<u8>);
75 impl Writer for VecWriter {
77 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
78 self.0.extend_from_slice(buf);
83 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
84 /// of some data when serialized but don't yet need the full data.
85 pub(crate) struct LengthCalculatingWriter(pub usize);
86 impl Writer for LengthCalculatingWriter {
88 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
94 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
95 /// forward to ensure we always consume exactly the fixed length specified.
96 pub(crate) struct FixedLengthReader<R: Read> {
101 impl<R: Read> FixedLengthReader<R> {
102 pub fn new(read: R, total_bytes: u64) -> Self {
103 Self { read, bytes_read: 0, total_bytes }
107 pub fn bytes_remain(&mut self) -> bool {
108 self.bytes_read != self.total_bytes
112 pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
113 copy(self, &mut sink()).unwrap();
114 if self.bytes_read != self.total_bytes {
115 Err(DecodeError::ShortRead)
121 impl<R: Read> Read for FixedLengthReader<R> {
123 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
124 if self.total_bytes == self.bytes_read {
127 let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
128 match self.read.read(&mut dest[0..(read_len as usize)]) {
130 self.bytes_read += v as u64;
139 impl<R: Read> LengthRead for FixedLengthReader<R> {
141 fn total_bytes(&self) -> u64 {
146 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
147 /// between "EOF reached before we started" and "EOF reached mid-read".
148 pub(crate) struct ReadTrackingReader<R: Read> {
152 impl<R: Read> ReadTrackingReader<R> {
153 pub fn new(read: R) -> Self {
154 Self { read, have_read: false }
157 impl<R: Read> Read for ReadTrackingReader<R> {
159 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
160 match self.read.read(dest) {
163 self.have_read = true;
171 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
173 /// (C-not exported) as we only export serialization to/from byte arrays instead
174 pub trait Writeable {
175 /// Writes self out to the given Writer
176 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
178 /// Writes self out to a Vec<u8>
179 fn encode(&self) -> Vec<u8> {
180 let mut msg = VecWriter(Vec::new());
181 self.write(&mut msg).unwrap();
185 /// Writes self out to a Vec<u8>
187 fn encode_with_len(&self) -> Vec<u8> {
188 let mut msg = VecWriter(Vec::new());
189 0u16.write(&mut msg).unwrap();
190 self.write(&mut msg).unwrap();
191 let len = msg.0.len();
192 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
196 /// Gets the length of this object after it has been serialized. This can be overridden to
197 /// optimize cases where we prepend an object with its length.
198 // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
200 fn serialized_length(&self) -> usize {
201 let mut len_calc = LengthCalculatingWriter(0);
202 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
207 impl<'a, T: Writeable> Writeable for &'a T {
208 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
211 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
213 /// (C-not exported) as we only export serialization to/from byte arrays instead
217 /// Reads a Self in from the given Read
218 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
221 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
222 /// from a Read given some additional set of arguments which is required to deserialize.
224 /// (C-not exported) as we only export serialization to/from byte arrays instead
225 pub trait ReadableArgs<P>
228 /// Reads a Self in from the given Read
229 fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
232 /// A std::io::Read that also provides the total bytes available to read.
233 pub(crate) trait LengthRead: Read {
234 /// The total number of bytes available to read.
235 fn total_bytes(&self) -> u64;
238 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
239 /// from a Read given some additional set of arguments which is required to deserialize, requiring
240 /// the implementer to provide the total length of the read.
241 pub(crate) trait LengthReadableArgs<P> where Self: Sized
243 /// Reads a Self in from the given LengthRead
244 fn read<R: LengthRead>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
247 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
248 /// from a Read, requiring the implementer to provide the total length of the read.
249 pub(crate) trait LengthReadable where Self: Sized
251 /// Reads a Self in from the given LengthRead
252 fn read<R: LengthRead>(reader: &mut R) -> Result<Self, DecodeError>;
255 /// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
257 /// (C-not exported) as we only export serialization to/from byte arrays instead
258 pub trait MaybeReadable
261 /// Reads a Self in from the given Read
262 fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
265 impl<T: Readable> MaybeReadable for T {
267 fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
268 Ok(Some(Readable::read(reader)?))
272 pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
273 impl<T: Readable> Readable for OptionDeserWrapper<T> {
275 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
276 Ok(Self(Some(Readable::read(reader)?)))
279 /// When handling default_values, we want to map the default-value T directly
280 /// to a OptionDeserWrapper<T> in a way that works for `field: T = t;` as
281 /// well. Thus, we assume `Into<T> for T` does nothing and use that.
282 impl<T: Readable> From<T> for OptionDeserWrapper<T> {
283 fn from(t: T) -> OptionDeserWrapper<T> { OptionDeserWrapper(Some(t)) }
286 /// Wrapper to write each element of a Vec with no length prefix
287 pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
288 impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
290 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
291 for ref v in self.0.iter() {
298 /// Wrapper to read elements from a given stream until it reaches the end of the stream.
299 pub(crate) struct VecReadWrapper<T>(pub Vec<T>);
300 impl<T: MaybeReadable> Readable for VecReadWrapper<T> {
302 fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
303 let mut values = Vec::new();
305 let mut track_read = ReadTrackingReader::new(&mut reader);
306 match MaybeReadable::read(&mut track_read) {
307 Ok(Some(v)) => { values.push(v); },
309 // If we failed to read any bytes at all, we reached the end of our TLV
310 // stream and have simply exhausted all entries.
311 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
312 Err(e) => return Err(e),
319 pub(crate) struct U48(pub u64);
320 impl Writeable for U48 {
322 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
323 writer.write_all(&be48_to_array(self.0))
326 impl Readable for U48 {
328 fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
329 let mut buf = [0; 6];
330 reader.read_exact(&mut buf)?;
331 Ok(U48(slice_to_be48(&buf)))
335 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
336 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
338 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
339 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
340 /// you're looking for an example of a variable-length integer to use for your own project, move
341 /// along, this is a rather poor design.
342 pub struct BigSize(pub u64);
343 impl Writeable for BigSize {
345 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
348 (self.0 as u8).write(writer)
351 0xFDu8.write(writer)?;
352 (self.0 as u16).write(writer)
354 0x10000...0xFFFFFFFF => {
355 0xFEu8.write(writer)?;
356 (self.0 as u32).write(writer)
359 0xFFu8.write(writer)?;
360 (self.0 as u64).write(writer)
365 impl Readable for BigSize {
367 fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
368 let n: u8 = Readable::read(reader)?;
371 let x: u64 = Readable::read(reader)?;
373 Err(DecodeError::InvalidValue)
379 let x: u32 = Readable::read(reader)?;
381 Err(DecodeError::InvalidValue)
383 Ok(BigSize(x as u64))
387 let x: u16 = Readable::read(reader)?;
389 Err(DecodeError::InvalidValue)
391 Ok(BigSize(x as u64))
394 n => Ok(BigSize(n as u64))
399 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
400 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
401 /// encapsulates such integers implementing Readable/Writeable for them.
402 #[cfg_attr(test, derive(PartialEq, Debug))]
403 pub(crate) struct HighZeroBytesDroppedBigSize<T>(pub T);
405 macro_rules! impl_writeable_primitive {
406 ($val_type:ty, $len: expr) => {
407 impl Writeable for $val_type {
409 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
410 writer.write_all(&self.to_be_bytes())
413 impl Writeable for HighZeroBytesDroppedBigSize<$val_type> {
415 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
416 // Skip any full leading 0 bytes when writing (in BE):
417 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
420 impl Readable for $val_type {
422 fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
423 let mut buf = [0; $len];
424 reader.read_exact(&mut buf)?;
425 Ok(<$val_type>::from_be_bytes(buf))
428 impl Readable for HighZeroBytesDroppedBigSize<$val_type> {
430 fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedBigSize<$val_type>, DecodeError> {
431 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
432 // the high bytes being dropped. To do so, we start reading into the middle of buf
433 // and then convert the appropriate number of bytes with extra high bytes out of
435 let mut buf = [0; $len*2];
436 let mut read_len = reader.read(&mut buf[$len..])?;
437 let mut total_read_len = read_len;
438 while read_len != 0 && total_read_len != $len {
439 read_len = reader.read(&mut buf[($len + total_read_len)..])?;
440 total_read_len += read_len;
442 if total_read_len == 0 || buf[$len] != 0 {
443 let first_byte = $len - ($len - total_read_len);
444 let mut bytes = [0; $len];
445 bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
446 Ok(HighZeroBytesDroppedBigSize(<$val_type>::from_be_bytes(bytes)))
448 // If the encoding had extra zero bytes, return a failure even though we know
449 // what they meant (as the TLV test vectors require this)
450 Err(DecodeError::InvalidValue)
457 impl_writeable_primitive!(u64, 8);
458 impl_writeable_primitive!(u32, 4);
459 impl_writeable_primitive!(u16, 2);
461 impl Writeable for u8 {
463 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
464 writer.write_all(&[*self])
467 impl Readable for u8 {
469 fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
470 let mut buf = [0; 1];
471 reader.read_exact(&mut buf)?;
476 impl Writeable for bool {
478 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
479 writer.write_all(&[if *self {1} else {0}])
482 impl Readable for bool {
484 fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
485 let mut buf = [0; 1];
486 reader.read_exact(&mut buf)?;
487 if buf[0] != 0 && buf[0] != 1 {
488 return Err(DecodeError::InvalidValue);
495 macro_rules! impl_array {
497 impl Writeable for [u8; $size]
500 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
505 impl Readable for [u8; $size]
508 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
509 let mut buf = [0u8; $size];
510 r.read_exact(&mut buf)?;
517 impl_array!(3); // for rgb
518 impl_array!(4); // for IPv4
519 impl_array!(12); // for OnionV2
520 impl_array!(16); // for IPv6
521 impl_array!(32); // for channel id & hmac
522 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
523 impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
524 impl_array!(1300); // for OnionPacket.hop_data
527 impl<K, V> Writeable for HashMap<K, V>
528 where K: Writeable + Eq + Hash,
532 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
533 (self.len() as u16).write(w)?;
534 for (key, value) in self.iter() {
542 impl<K, V> Readable for HashMap<K, V>
543 where K: Readable + Eq + Hash,
547 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
548 let len: u16 = Readable::read(r)?;
549 let mut ret = HashMap::with_capacity(len as usize);
552 let v_opt = V::read(r)?;
553 if let Some(v) = v_opt {
554 if ret.insert(k, v).is_some() {
555 return Err(DecodeError::InvalidValue);
564 impl<T> Writeable for HashSet<T>
565 where T: Writeable + Eq + Hash
568 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
569 (self.len() as u16).write(w)?;
570 for item in self.iter() {
577 impl<T> Readable for HashSet<T>
578 where T: Readable + Eq + Hash
581 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
582 let len: u16 = Readable::read(r)?;
583 let mut ret = HashSet::with_capacity(len as usize);
585 if !ret.insert(T::read(r)?) {
586 return Err(DecodeError::InvalidValue)
594 impl Writeable for Vec<u8> {
596 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
597 (self.len() as u16).write(w)?;
602 impl Readable for Vec<u8> {
604 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
605 let len: u16 = Readable::read(r)?;
606 let mut ret = Vec::with_capacity(len as usize);
607 ret.resize(len as usize, 0);
608 r.read_exact(&mut ret)?;
612 impl Writeable for Vec<Signature> {
614 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
615 (self.len() as u16).write(w)?;
616 for e in self.iter() {
623 impl Readable for Vec<Signature> {
625 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
626 let len: u16 = Readable::read(r)?;
627 let byte_size = (len as usize)
628 .checked_mul(COMPACT_SIGNATURE_SIZE)
629 .ok_or(DecodeError::BadLengthDescriptor)?;
630 if byte_size > MAX_BUF_SIZE {
631 return Err(DecodeError::BadLengthDescriptor);
633 let mut ret = Vec::with_capacity(len as usize);
634 for _ in 0..len { ret.push(Readable::read(r)?); }
639 impl Writeable for Script {
640 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
641 (self.len() as u16).write(w)?;
642 w.write_all(self.as_bytes())
646 impl Readable for Script {
647 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
648 let len = <u16 as Readable>::read(r)? as usize;
649 let mut buf = vec![0; len];
650 r.read_exact(&mut buf)?;
651 Ok(Script::from(buf))
655 impl Writeable for PublicKey {
656 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
657 self.serialize().write(w)
660 fn serialized_length(&self) -> usize {
665 impl Readable for PublicKey {
666 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
667 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
668 match PublicKey::from_slice(&buf) {
670 Err(_) => return Err(DecodeError::InvalidValue),
675 impl Writeable for SecretKey {
676 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
677 let mut ser = [0; SECRET_KEY_SIZE];
678 ser.copy_from_slice(&self[..]);
682 fn serialized_length(&self) -> usize {
687 impl Readable for SecretKey {
688 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
689 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
690 match SecretKey::from_slice(&buf) {
692 Err(_) => return Err(DecodeError::InvalidValue),
697 impl Writeable for Sha256dHash {
698 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
699 w.write_all(&self[..])
703 impl Readable for Sha256dHash {
704 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
705 use bitcoin::hashes::Hash;
707 let buf: [u8; 32] = Readable::read(r)?;
708 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
712 impl Writeable for Signature {
713 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
714 self.serialize_compact().write(w)
717 fn serialized_length(&self) -> usize {
718 COMPACT_SIGNATURE_SIZE
722 impl Readable for Signature {
723 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
724 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
725 match Signature::from_compact(&buf) {
727 Err(_) => return Err(DecodeError::InvalidValue),
732 impl Writeable for PaymentPreimage {
733 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
738 impl Readable for PaymentPreimage {
739 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
740 let buf: [u8; 32] = Readable::read(r)?;
741 Ok(PaymentPreimage(buf))
745 impl Writeable for PaymentHash {
746 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
751 impl Readable for PaymentHash {
752 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
753 let buf: [u8; 32] = Readable::read(r)?;
758 impl Writeable for PaymentSecret {
759 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
764 impl Readable for PaymentSecret {
765 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
766 let buf: [u8; 32] = Readable::read(r)?;
767 Ok(PaymentSecret(buf))
771 impl<T: Writeable> Writeable for Box<T> {
772 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
777 impl<T: Readable> Readable for Box<T> {
778 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
779 Ok(Box::new(Readable::read(r)?))
783 impl<T: Writeable> Writeable for Option<T> {
784 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
786 None => 0u8.write(w)?,
788 BigSize(data.serialized_length() as u64 + 1).write(w)?;
796 impl<T: Readable> Readable for Option<T>
798 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
799 let len: BigSize = Readable::read(r)?;
803 let mut reader = FixedLengthReader::new(r, len - 1);
804 Ok(Some(Readable::read(&mut reader)?))
810 impl Writeable for Txid {
811 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
812 w.write_all(&self[..])
816 impl Readable for Txid {
817 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
818 use bitcoin::hashes::Hash;
820 let buf: [u8; 32] = Readable::read(r)?;
821 Ok(Txid::from_slice(&buf[..]).unwrap())
825 impl Writeable for BlockHash {
826 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
827 w.write_all(&self[..])
831 impl Readable for BlockHash {
832 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
833 use bitcoin::hashes::Hash;
835 let buf: [u8; 32] = Readable::read(r)?;
836 Ok(BlockHash::from_slice(&buf[..]).unwrap())
840 impl Writeable for OutPoint {
841 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
848 impl Readable for OutPoint {
849 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
850 let txid = Readable::read(r)?;
851 let vout = Readable::read(r)?;
859 macro_rules! impl_consensus_ser {
860 ($bitcoin_type: ty) => {
861 impl Writeable for $bitcoin_type {
862 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
863 match self.consensus_encode(&mut WriterWriteAdaptor(writer)) {
870 impl Readable for $bitcoin_type {
871 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
872 match consensus::encode::Decodable::consensus_decode(r) {
874 Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
875 Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
876 Err(_) => Err(DecodeError::InvalidValue),
882 impl_consensus_ser!(Transaction);
883 impl_consensus_ser!(TxOut);
885 impl<T: Readable> Readable for Mutex<T> {
886 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
887 let t: T = Readable::read(r)?;
891 impl<T: Writeable> Writeable for Mutex<T> {
892 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
893 self.lock().unwrap().write(w)
897 impl<A: Readable, B: Readable> Readable for (A, B) {
898 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
899 let a: A = Readable::read(r)?;
900 let b: B = Readable::read(r)?;
904 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
905 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
911 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
912 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
913 let a: A = Readable::read(r)?;
914 let b: B = Readable::read(r)?;
915 let c: C = Readable::read(r)?;
919 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
920 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
927 impl Writeable for () {
928 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
932 impl Readable for () {
933 fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
938 impl Writeable for String {
940 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
941 (self.len() as u16).write(w)?;
942 w.write_all(self.as_bytes())
945 impl Readable for String {
947 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
948 let v: Vec<u8> = Readable::read(r)?;
949 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;
954 /// Represents a hostname for serialization purposes.
955 /// Only the character set and length will be validated.
956 /// The character set consists of ASCII alphanumeric characters, hyphens, and periods.
957 /// Its length is guaranteed to be representable by a single byte.
958 /// This serialization is used by BOLT 7 hostnames.
959 #[derive(Clone, Debug, PartialEq)]
960 pub struct Hostname(String);
962 /// Returns the length of the hostname.
963 pub fn len(&self) -> u8 {
964 (&self.0).len() as u8
967 impl Deref for Hostname {
968 type Target = String;
970 fn deref(&self) -> &Self::Target {
974 impl From<Hostname> for String {
975 fn from(hostname: Hostname) -> Self {
979 impl TryFrom<Vec<u8>> for Hostname {
982 fn try_from(bytes: Vec<u8>) -> Result<Self, Self::Error> {
983 if let Ok(s) = String::from_utf8(bytes) {
984 Hostname::try_from(s)
990 impl TryFrom<String> for Hostname {
993 fn try_from(s: String) -> Result<Self, Self::Error> {
994 if s.len() <= 255 && s.chars().all(|c|
995 c.is_ascii_alphanumeric() ||
1005 impl Writeable for Hostname {
1007 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1008 self.len().write(w)?;
1009 w.write_all(self.as_bytes())
1012 impl Readable for Hostname {
1014 fn read<R: Read>(r: &mut R) -> Result<Hostname, DecodeError> {
1015 let len: u8 = Readable::read(r)?;
1016 let mut vec = Vec::with_capacity(len.into());
1017 vec.resize(len.into(), 0);
1018 r.read_exact(&mut vec)?;
1019 Hostname::try_from(vec).map_err(|_| DecodeError::InvalidValue)
1023 impl Writeable for Duration {
1025 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
1026 self.as_secs().write(w)?;
1027 self.subsec_nanos().write(w)
1030 impl Readable for Duration {
1032 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
1033 let secs = Readable::read(r)?;
1034 let nanos = Readable::read(r)?;
1035 Ok(Duration::new(secs, nanos))
1041 use core::convert::TryFrom;
1042 use util::ser::{Readable, Hostname, Writeable};
1045 fn hostname_conversion() {
1046 assert_eq!(Hostname::try_from(String::from("a-test.com")).unwrap().as_str(), "a-test.com");
1048 assert!(Hostname::try_from(String::from("\"")).is_err());
1049 assert!(Hostname::try_from(String::from("$")).is_err());
1050 assert!(Hostname::try_from(String::from("⚡")).is_err());
1051 let mut large_vec = Vec::with_capacity(256);
1052 large_vec.resize(256, b'A');
1053 assert!(Hostname::try_from(String::from_utf8(large_vec).unwrap()).is_err());
1057 fn hostname_serialization() {
1058 let hostname = Hostname::try_from(String::from("test")).unwrap();
1059 let mut buf: Vec<u8> = Vec::new();
1060 hostname.write(&mut buf).unwrap();
1061 assert_eq!(Hostname::read(&mut buf.as_slice()).unwrap().as_str(), "test");