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};
20 use bitcoin::secp256k1::{PublicKey, SecretKey};
21 use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
22 use bitcoin::secp256k1::ecdsa::Signature;
23 use bitcoin::blockdata::script::Script;
24 use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
25 use bitcoin::consensus;
26 use bitcoin::consensus::Encodable;
27 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
28 use bitcoin::hash_types::{Txid, BlockHash};
29 use core::marker::Sized;
30 use core::time::Duration;
31 use ln::msgs::DecodeError;
32 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
34 use util::byte_utils::{be48_to_array, slice_to_be48};
36 /// serialization buffer size
37 pub const MAX_BUF_SIZE: usize = 64 * 1024;
39 /// A simplified version of std::io::Write that exists largely for backwards compatibility.
40 /// An impl is provided for any type that also impls std::io::Write.
42 /// (C-not exported) as we only export serialization to/from byte arrays instead
44 /// Writes the given buf out. See std::io::Write::write_all for more
45 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error>;
48 impl<W: Write> Writer for W {
50 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
51 <Self as io::Write>::write_all(self, buf)
55 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
56 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
58 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
62 fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
63 self.0.write_all(buf)?;
67 fn flush(&mut self) -> Result<(), io::Error> {
72 pub(crate) struct VecWriter(pub Vec<u8>);
73 impl Writer for VecWriter {
75 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
76 self.0.extend_from_slice(buf);
81 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
82 /// of some data when serialized but don't yet need the full data.
83 pub(crate) struct LengthCalculatingWriter(pub usize);
84 impl Writer for LengthCalculatingWriter {
86 fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
92 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
93 /// forward to ensure we always consume exactly the fixed length specified.
94 pub(crate) struct FixedLengthReader<R: Read> {
99 impl<R: Read> FixedLengthReader<R> {
100 pub fn new(read: R, total_bytes: u64) -> Self {
101 Self { read, bytes_read: 0, total_bytes }
105 pub fn bytes_remain(&mut self) -> bool {
106 self.bytes_read != self.total_bytes
110 pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
111 copy(self, &mut sink()).unwrap();
112 if self.bytes_read != self.total_bytes {
113 Err(DecodeError::ShortRead)
119 impl<R: Read> Read for FixedLengthReader<R> {
121 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
122 if self.total_bytes == self.bytes_read {
125 let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
126 match self.read.read(&mut dest[0..(read_len as usize)]) {
128 self.bytes_read += v as u64;
137 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
138 /// between "EOF reached before we started" and "EOF reached mid-read".
139 pub(crate) struct ReadTrackingReader<R: Read> {
143 impl<R: Read> ReadTrackingReader<R> {
144 pub fn new(read: R) -> Self {
145 Self { read, have_read: false }
148 impl<R: Read> Read for ReadTrackingReader<R> {
150 fn read(&mut self, dest: &mut [u8]) -> Result<usize, io::Error> {
151 match self.read.read(dest) {
154 self.have_read = true;
162 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
164 /// (C-not exported) as we only export serialization to/from byte arrays instead
165 pub trait Writeable {
166 /// Writes self out to the given Writer
167 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error>;
169 /// Writes self out to a Vec<u8>
170 fn encode(&self) -> Vec<u8> {
171 let mut msg = VecWriter(Vec::new());
172 self.write(&mut msg).unwrap();
176 /// Writes self out to a Vec<u8>
178 fn encode_with_len(&self) -> Vec<u8> {
179 let mut msg = VecWriter(Vec::new());
180 0u16.write(&mut msg).unwrap();
181 self.write(&mut msg).unwrap();
182 let len = msg.0.len();
183 msg.0[..2].copy_from_slice(&(len as u16 - 2).to_be_bytes());
187 /// Gets the length of this object after it has been serialized. This can be overridden to
188 /// optimize cases where we prepend an object with its length.
189 // Note that LLVM optimizes this away in most cases! Check that it isn't before you override!
191 fn serialized_length(&self) -> usize {
192 let mut len_calc = LengthCalculatingWriter(0);
193 self.write(&mut len_calc).expect("No in-memory data may fail to serialize");
198 impl<'a, T: Writeable> Writeable for &'a T {
199 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { (*self).write(writer) }
202 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
204 /// (C-not exported) as we only export serialization to/from byte arrays instead
208 /// Reads a Self in from the given Read
209 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError>;
212 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
213 /// from a Read given some additional set of arguments which is required to deserialize.
215 /// (C-not exported) as we only export serialization to/from byte arrays instead
216 pub trait ReadableArgs<P>
219 /// Reads a Self in from the given Read
220 fn read<R: Read>(reader: &mut R, params: P) -> Result<Self, DecodeError>;
223 /// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
225 /// (C-not exported) as we only export serialization to/from byte arrays instead
226 pub trait MaybeReadable
229 /// Reads a Self in from the given Read
230 fn read<R: Read>(reader: &mut R) -> Result<Option<Self>, DecodeError>;
233 impl<T: Readable> MaybeReadable for T {
235 fn read<R: Read>(reader: &mut R) -> Result<Option<T>, DecodeError> {
236 Ok(Some(Readable::read(reader)?))
240 pub(crate) struct OptionDeserWrapper<T: Readable>(pub Option<T>);
241 impl<T: Readable> Readable for OptionDeserWrapper<T> {
243 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
244 Ok(Self(Some(Readable::read(reader)?)))
248 /// Wrapper to write each element of a Vec with no length prefix
249 pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
250 impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
252 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
253 for ref v in self.0.iter() {
260 /// Wrapper to read elements from a given stream until it reaches the end of the stream.
261 pub(crate) struct VecReadWrapper<T>(pub Vec<T>);
262 impl<T: MaybeReadable> Readable for VecReadWrapper<T> {
264 fn read<R: Read>(mut reader: &mut R) -> Result<Self, DecodeError> {
265 let mut values = Vec::new();
267 let mut track_read = ReadTrackingReader::new(&mut reader);
268 match MaybeReadable::read(&mut track_read) {
269 Ok(Some(v)) => { values.push(v); },
271 // If we failed to read any bytes at all, we reached the end of our TLV
272 // stream and have simply exhausted all entries.
273 Err(ref e) if e == &DecodeError::ShortRead && !track_read.have_read => break,
274 Err(e) => return Err(e),
281 pub(crate) struct U48(pub u64);
282 impl Writeable for U48 {
284 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
285 writer.write_all(&be48_to_array(self.0))
288 impl Readable for U48 {
290 fn read<R: Read>(reader: &mut R) -> Result<U48, DecodeError> {
291 let mut buf = [0; 6];
292 reader.read_exact(&mut buf)?;
293 Ok(U48(slice_to_be48(&buf)))
297 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
298 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
300 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
301 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
302 /// you're looking for an example of a variable-length integer to use for your own project, move
303 /// along, this is a rather poor design.
304 pub struct BigSize(pub u64);
305 impl Writeable for BigSize {
307 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
310 (self.0 as u8).write(writer)
313 0xFDu8.write(writer)?;
314 (self.0 as u16).write(writer)
316 0x10000...0xFFFFFFFF => {
317 0xFEu8.write(writer)?;
318 (self.0 as u32).write(writer)
321 0xFFu8.write(writer)?;
322 (self.0 as u64).write(writer)
327 impl Readable for BigSize {
329 fn read<R: Read>(reader: &mut R) -> Result<BigSize, DecodeError> {
330 let n: u8 = Readable::read(reader)?;
333 let x: u64 = Readable::read(reader)?;
335 Err(DecodeError::InvalidValue)
341 let x: u32 = Readable::read(reader)?;
343 Err(DecodeError::InvalidValue)
345 Ok(BigSize(x as u64))
349 let x: u16 = Readable::read(reader)?;
351 Err(DecodeError::InvalidValue)
353 Ok(BigSize(x as u64))
356 n => Ok(BigSize(n as u64))
361 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
362 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
363 /// encapsulates such integers implementing Readable/Writeable for them.
364 #[cfg_attr(test, derive(PartialEq, Debug))]
365 pub(crate) struct HighZeroBytesDroppedVarInt<T>(pub T);
367 macro_rules! impl_writeable_primitive {
368 ($val_type:ty, $len: expr) => {
369 impl Writeable for $val_type {
371 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
372 writer.write_all(&self.to_be_bytes())
375 impl Writeable for HighZeroBytesDroppedVarInt<$val_type> {
377 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
378 // Skip any full leading 0 bytes when writing (in BE):
379 writer.write_all(&self.0.to_be_bytes()[(self.0.leading_zeros()/8) as usize..$len])
382 impl Readable for $val_type {
384 fn read<R: Read>(reader: &mut R) -> Result<$val_type, DecodeError> {
385 let mut buf = [0; $len];
386 reader.read_exact(&mut buf)?;
387 Ok(<$val_type>::from_be_bytes(buf))
390 impl Readable for HighZeroBytesDroppedVarInt<$val_type> {
392 fn read<R: Read>(reader: &mut R) -> Result<HighZeroBytesDroppedVarInt<$val_type>, DecodeError> {
393 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
394 // the high bytes being dropped. To do so, we start reading into the middle of buf
395 // and then convert the appropriate number of bytes with extra high bytes out of
397 let mut buf = [0; $len*2];
398 let mut read_len = reader.read(&mut buf[$len..])?;
399 let mut total_read_len = read_len;
400 while read_len != 0 && total_read_len != $len {
401 read_len = reader.read(&mut buf[($len + total_read_len)..])?;
402 total_read_len += read_len;
404 if total_read_len == 0 || buf[$len] != 0 {
405 let first_byte = $len - ($len - total_read_len);
406 let mut bytes = [0; $len];
407 bytes.copy_from_slice(&buf[first_byte..first_byte + $len]);
408 Ok(HighZeroBytesDroppedVarInt(<$val_type>::from_be_bytes(bytes)))
410 // If the encoding had extra zero bytes, return a failure even though we know
411 // what they meant (as the TLV test vectors require this)
412 Err(DecodeError::InvalidValue)
419 impl_writeable_primitive!(u64, 8);
420 impl_writeable_primitive!(u32, 4);
421 impl_writeable_primitive!(u16, 2);
423 impl Writeable for u8 {
425 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
426 writer.write_all(&[*self])
429 impl Readable for u8 {
431 fn read<R: Read>(reader: &mut R) -> Result<u8, DecodeError> {
432 let mut buf = [0; 1];
433 reader.read_exact(&mut buf)?;
438 impl Writeable for bool {
440 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
441 writer.write_all(&[if *self {1} else {0}])
444 impl Readable for bool {
446 fn read<R: Read>(reader: &mut R) -> Result<bool, DecodeError> {
447 let mut buf = [0; 1];
448 reader.read_exact(&mut buf)?;
449 if buf[0] != 0 && buf[0] != 1 {
450 return Err(DecodeError::InvalidValue);
457 macro_rules! impl_array {
459 impl Writeable for [u8; $size]
462 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
467 impl Readable for [u8; $size]
470 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
471 let mut buf = [0u8; $size];
472 r.read_exact(&mut buf)?;
479 impl_array!(3); // for rgb
480 impl_array!(4); // for IPv4
481 impl_array!(12); // for OnionV2
482 impl_array!(16); // for IPv6
483 impl_array!(32); // for channel id & hmac
484 impl_array!(PUBLIC_KEY_SIZE); // for PublicKey
485 impl_array!(COMPACT_SIGNATURE_SIZE); // for Signature
486 impl_array!(1300); // for OnionPacket.hop_data
489 impl<K, V> Writeable for HashMap<K, V>
490 where K: Writeable + Eq + Hash,
494 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
495 (self.len() as u16).write(w)?;
496 for (key, value) in self.iter() {
504 impl<K, V> Readable for HashMap<K, V>
505 where K: Readable + Eq + Hash,
509 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
510 let len: u16 = Readable::read(r)?;
511 let mut ret = HashMap::with_capacity(len as usize);
514 let v_opt = V::read(r)?;
515 if let Some(v) = v_opt {
516 if ret.insert(k, v).is_some() {
517 return Err(DecodeError::InvalidValue);
526 impl<T> Writeable for HashSet<T>
527 where T: Writeable + Eq + Hash
530 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
531 (self.len() as u16).write(w)?;
532 for item in self.iter() {
539 impl<T> Readable for HashSet<T>
540 where T: Readable + Eq + Hash
543 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
544 let len: u16 = Readable::read(r)?;
545 let mut ret = HashSet::with_capacity(len as usize);
547 if !ret.insert(T::read(r)?) {
548 return Err(DecodeError::InvalidValue)
556 impl Writeable for Vec<u8> {
558 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
559 (self.len() as u16).write(w)?;
564 impl Readable for Vec<u8> {
566 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
567 let len: u16 = Readable::read(r)?;
568 let mut ret = Vec::with_capacity(len as usize);
569 ret.resize(len as usize, 0);
570 r.read_exact(&mut ret)?;
574 impl Writeable for Vec<Signature> {
576 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
577 (self.len() as u16).write(w)?;
578 for e in self.iter() {
585 impl Readable for Vec<Signature> {
587 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
588 let len: u16 = Readable::read(r)?;
589 let byte_size = (len as usize)
590 .checked_mul(COMPACT_SIGNATURE_SIZE)
591 .ok_or(DecodeError::BadLengthDescriptor)?;
592 if byte_size > MAX_BUF_SIZE {
593 return Err(DecodeError::BadLengthDescriptor);
595 let mut ret = Vec::with_capacity(len as usize);
596 for _ in 0..len { ret.push(Readable::read(r)?); }
601 impl Writeable for Script {
602 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
603 (self.len() as u16).write(w)?;
604 w.write_all(self.as_bytes())
608 impl Readable for Script {
609 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
610 let len = <u16 as Readable>::read(r)? as usize;
611 let mut buf = vec![0; len];
612 r.read_exact(&mut buf)?;
613 Ok(Script::from(buf))
617 impl Writeable for PublicKey {
618 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
619 self.serialize().write(w)
622 fn serialized_length(&self) -> usize {
627 impl Readable for PublicKey {
628 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
629 let buf: [u8; PUBLIC_KEY_SIZE] = Readable::read(r)?;
630 match PublicKey::from_slice(&buf) {
632 Err(_) => return Err(DecodeError::InvalidValue),
637 impl Writeable for SecretKey {
638 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
639 let mut ser = [0; SECRET_KEY_SIZE];
640 ser.copy_from_slice(&self[..]);
644 fn serialized_length(&self) -> usize {
649 impl Readable for SecretKey {
650 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
651 let buf: [u8; SECRET_KEY_SIZE] = Readable::read(r)?;
652 match SecretKey::from_slice(&buf) {
654 Err(_) => return Err(DecodeError::InvalidValue),
659 impl Writeable for Sha256dHash {
660 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
661 w.write_all(&self[..])
665 impl Readable for Sha256dHash {
666 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
667 use bitcoin::hashes::Hash;
669 let buf: [u8; 32] = Readable::read(r)?;
670 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
674 impl Writeable for Signature {
675 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
676 self.serialize_compact().write(w)
679 fn serialized_length(&self) -> usize {
680 COMPACT_SIGNATURE_SIZE
684 impl Readable for Signature {
685 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
686 let buf: [u8; COMPACT_SIGNATURE_SIZE] = Readable::read(r)?;
687 match Signature::from_compact(&buf) {
689 Err(_) => return Err(DecodeError::InvalidValue),
694 impl Writeable for PaymentPreimage {
695 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
700 impl Readable for PaymentPreimage {
701 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
702 let buf: [u8; 32] = Readable::read(r)?;
703 Ok(PaymentPreimage(buf))
707 impl Writeable for PaymentHash {
708 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
713 impl Readable for PaymentHash {
714 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
715 let buf: [u8; 32] = Readable::read(r)?;
720 impl Writeable for PaymentSecret {
721 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
726 impl Readable for PaymentSecret {
727 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
728 let buf: [u8; 32] = Readable::read(r)?;
729 Ok(PaymentSecret(buf))
733 impl<T: Writeable> Writeable for Box<T> {
734 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
739 impl<T: Readable> Readable for Box<T> {
740 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
741 Ok(Box::new(Readable::read(r)?))
745 impl<T: Writeable> Writeable for Option<T> {
746 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
748 None => 0u8.write(w)?,
750 BigSize(data.serialized_length() as u64 + 1).write(w)?;
758 impl<T: Readable> Readable for Option<T>
760 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
761 let len: BigSize = Readable::read(r)?;
765 let mut reader = FixedLengthReader::new(r, len - 1);
766 Ok(Some(Readable::read(&mut reader)?))
772 impl Writeable for Txid {
773 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
774 w.write_all(&self[..])
778 impl Readable for Txid {
779 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
780 use bitcoin::hashes::Hash;
782 let buf: [u8; 32] = Readable::read(r)?;
783 Ok(Txid::from_slice(&buf[..]).unwrap())
787 impl Writeable for BlockHash {
788 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
789 w.write_all(&self[..])
793 impl Readable for BlockHash {
794 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
795 use bitcoin::hashes::Hash;
797 let buf: [u8; 32] = Readable::read(r)?;
798 Ok(BlockHash::from_slice(&buf[..]).unwrap())
802 impl Writeable for OutPoint {
803 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
810 impl Readable for OutPoint {
811 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
812 let txid = Readable::read(r)?;
813 let vout = Readable::read(r)?;
821 macro_rules! impl_consensus_ser {
822 ($bitcoin_type: ty) => {
823 impl Writeable for $bitcoin_type {
824 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
825 match self.consensus_encode(WriterWriteAdaptor(writer)) {
832 impl Readable for $bitcoin_type {
833 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
834 match consensus::encode::Decodable::consensus_decode(r) {
836 Err(consensus::encode::Error::Io(ref e)) if e.kind() == io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
837 Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e.kind())),
838 Err(_) => Err(DecodeError::InvalidValue),
844 impl_consensus_ser!(Transaction);
845 impl_consensus_ser!(TxOut);
847 impl<T: Readable> Readable for Mutex<T> {
848 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
849 let t: T = Readable::read(r)?;
853 impl<T: Writeable> Writeable for Mutex<T> {
854 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
855 self.lock().unwrap().write(w)
859 impl<A: Readable, B: Readable> Readable for (A, B) {
860 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
861 let a: A = Readable::read(r)?;
862 let b: B = Readable::read(r)?;
866 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
867 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
873 impl<A: Readable, B: Readable, C: Readable> Readable for (A, B, C) {
874 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
875 let a: A = Readable::read(r)?;
876 let b: B = Readable::read(r)?;
877 let c: C = Readable::read(r)?;
881 impl<A: Writeable, B: Writeable, C: Writeable> Writeable for (A, B, C) {
882 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
889 impl Writeable for () {
890 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
894 impl Readable for () {
895 fn read<R: Read>(_r: &mut R) -> Result<Self, DecodeError> {
900 impl Writeable for String {
902 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
903 (self.len() as u16).write(w)?;
904 w.write_all(self.as_bytes())
907 impl Readable for String {
909 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
910 let v: Vec<u8> = Readable::read(r)?;
911 let ret = String::from_utf8(v).map_err(|_| DecodeError::InvalidValue)?;
916 impl Writeable for Duration {
918 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
919 self.as_secs().write(w)?;
920 self.subsec_nanos().write(w)
923 impl Readable for Duration {
925 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
926 let secs = Readable::read(r)?;
927 let nanos = Readable::read(r)?;
928 Ok(Duration::new(secs, nanos))