_ Git - rust-lightning/blob - lightning/src/util/ser.rs

   1 //! A very simple serialization framework which is used to serialize/deserialize messages as well
   2 //! as ChannelsManagers and ChannelMonitors.
   3
   4 use std::result::Result;
   5 use std::io::{Read, Write};
   6 use std::collections::HashMap;
   7 use std::hash::Hash;
   8 use std::sync::Mutex;
   9 use std::cmp;
  10
  11 use secp256k1::Signature;
  12 use secp256k1::key::{PublicKey, SecretKey};
  13 use bitcoin::blockdata::script::Script;
  14 use bitcoin::blockdata::transaction::{OutPoint, Transaction};
  15 use bitcoin::consensus;
  16 use bitcoin::consensus::Encodable;
  17 use bitcoin_hashes::sha256d::Hash as Sha256dHash;
  18 use std::marker::Sized;
  19 use ln::msgs::DecodeError;
  20 use ln::channelmanager::{PaymentPreimage, PaymentHash};
  21 use util::byte_utils;
  22
  23 use util::byte_utils::{be64_to_array, be48_to_array, be32_to_array, be16_to_array, slice_to_be16, slice_to_be32, slice_to_be48, slice_to_be64};
  24
  25 const MAX_BUF_SIZE: usize = 64 * 1024;
  26
  27 /// A trait that is similar to std::io::Write but has one extra function which can be used to size
  28 /// buffers being written into.
  29 /// An impl is provided for any type that also impls std::io::Write which simply ignores size
  30 /// hints.
  31 pub trait Writer {
  32         /// Writes the given buf out. See std::io::Write::write_all for more
  33         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error>;
  34         /// Hints that data of the given size is about the be written. This may not always be called
  35         /// prior to data being written and may be safely ignored.
  36         fn size_hint(&mut self, size: usize);
  37 }
  38
  39 impl<W: Write> Writer for W {
  40         #[inline]
  41         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  42                 <Self as ::std::io::Write>::write_all(self, buf)
  43         }
  44         #[inline]
  45         fn size_hint(&mut self, _size: usize) { }
  46 }
  47
  48 pub(crate) struct WriterWriteAdaptor<'a, W: Writer + 'a>(pub &'a mut W);
  49 impl<'a, W: Writer + 'a> Write for WriterWriteAdaptor<'a, W> {
  50         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  51                 self.0.write_all(buf)
  52         }
  53         fn write(&mut self, buf: &[u8]) -> Result<usize, ::std::io::Error> {
  54                 self.0.write_all(buf)?;
  55                 Ok(buf.len())
  56         }
  57         fn flush(&mut self) -> Result<(), ::std::io::Error> {
  58                 Ok(())
  59         }
  60 }
  61
  62 pub(crate) struct VecWriter(pub Vec<u8>);
  63 impl Writer for VecWriter {
  64         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  65                 self.0.extend_from_slice(buf);
  66                 Ok(())
  67         }
  68         fn size_hint(&mut self, size: usize) {
  69                 self.0.reserve_exact(size);
  70         }
  71 }
  72
  73 /// Writer that only tracks the amount of data written - useful if you need to calculate the length
  74 /// of some data when serialized but don't yet need the full data.
  75 pub(crate) struct LengthCalculatingWriter(pub usize);
  76 impl Writer for LengthCalculatingWriter {
  77         #[inline]
  78         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  79                 self.0 += buf.len();
  80                 Ok(())
  81         }
  82         #[inline]
  83         fn size_hint(&mut self, _size: usize) {}
  84 }
  85
  86 /// Essentially std::io::Take but a bit simpler and with a method to walk the underlying stream
  87 /// forward to ensure we always consume exactly the fixed length specified.
  88 pub(crate) struct FixedLengthReader<R: Read> {
  89         read: R,
  90         bytes_read: u64,
  91         total_bytes: u64,
  92 }
  93 impl<R: Read> FixedLengthReader<R> {
  94         pub fn new(read: R, total_bytes: u64) -> Self {
  95                 Self { read, bytes_read: 0, total_bytes }
  96         }
  97
  98         pub fn bytes_remain(&mut self) -> bool {
  99                 self.bytes_read != self.total_bytes
 100         }
 101
 102         pub fn eat_remaining(&mut self) -> Result<(), DecodeError> {
 103                 ::std::io::copy(self, &mut ::std::io::sink()).unwrap();
 104                 if self.bytes_read != self.total_bytes {
 105                         Err(DecodeError::ShortRead)
 106                 } else {
 107                         Ok(())
 108                 }
 109         }
 110 }
 111 impl<R: Read> Read for FixedLengthReader<R> {
 112         fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
 113                 if self.total_bytes == self.bytes_read {
 114                         Ok(0)
 115                 } else {
 116                         let read_len = cmp::min(dest.len() as u64, self.total_bytes - self.bytes_read);
 117                         match self.read.read(&mut dest[0..(read_len as usize)]) {
 118                                 Ok(v) => {
 119                                         self.bytes_read += v as u64;
 120                                         Ok(v)
 121                                 },
 122                                 Err(e) => Err(e),
 123                         }
 124                 }
 125         }
 126 }
 127
 128 /// A Read which tracks whether any bytes have been read at all. This allows us to distinguish
 129 /// between "EOF reached before we started" and "EOF reached mid-read".
 130 pub(crate) struct ReadTrackingReader<R: Read> {
 131         read: R,
 132         pub have_read: bool,
 133 }
 134 impl<R: Read> ReadTrackingReader<R> {
 135         pub fn new(read: R) -> Self {
 136                 Self { read, have_read: false }
 137         }
 138 }
 139 impl<R: Read> Read for ReadTrackingReader<R> {
 140         fn read(&mut self, dest: &mut [u8]) -> Result<usize, ::std::io::Error> {
 141                 match self.read.read(dest) {
 142                         Ok(0) => Ok(0),
 143                         Ok(len) => {
 144                                 self.have_read = true;
 145                                 Ok(len)
 146                         },
 147                         Err(e) => Err(e),
 148                 }
 149         }
 150 }
 151
 152 /// A trait that various rust-lightning types implement allowing them to be written out to a Writer
 153 pub trait Writeable {
 154         /// Writes self out to the given Writer
 155         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error>;
 156
 157         /// Writes self out to a Vec<u8>
 158         fn encode(&self) -> Vec<u8> {
 159                 let mut msg = VecWriter(Vec::new());
 160                 self.write(&mut msg).unwrap();
 161                 msg.0
 162         }
 163
 164         /// Writes self out to a Vec<u8>
 165         fn encode_with_len(&self) -> Vec<u8> {
 166                 let mut msg = VecWriter(Vec::new());
 167                 0u16.write(&mut msg).unwrap();
 168                 self.write(&mut msg).unwrap();
 169                 let len = msg.0.len();
 170                 msg.0[..2].copy_from_slice(&byte_utils::be16_to_array(len as u16 - 2));
 171                 msg.0
 172         }
 173 }
 174
 175 /// A trait that various rust-lightning types implement allowing them to be read in from a Read
 176 pub trait Readable<R>
 177         where Self: Sized,
 178               R: Read
 179 {
 180         /// Reads a Self in from the given Read
 181         fn read(reader: &mut R) -> Result<Self, DecodeError>;
 182 }
 183
 184 /// A trait that various higher-level rust-lightning types implement allowing them to be read in
 185 /// from a Read given some additional set of arguments which is required to deserialize.
 186 pub trait ReadableArgs<R, P>
 187         where Self: Sized,
 188               R: Read
 189 {
 190         /// Reads a Self in from the given Read
 191         fn read(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 192 }
 193
 194 pub(crate) struct U48(pub u64);
 195 impl Writeable for U48 {
 196         #[inline]
 197         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 198                 writer.write_all(&be48_to_array(self.0))
 199         }
 200 }
 201 impl<R: Read> Readable<R> for U48 {
 202         #[inline]
 203         fn read(reader: &mut R) -> Result<U48, DecodeError> {
 204                 let mut buf = [0; 6];
 205                 reader.read_exact(&mut buf)?;
 206                 Ok(U48(slice_to_be48(&buf)))
 207         }
 208 }
 209
 210 /// Lightning TLV uses a custom variable-length integer called BigSize. It is similar to Bitcoin's
 211 /// variable-length integers except that it is serialized in big-endian instead of little-endian.
 212 ///
 213 /// Like Bitcoin's variable-length integer, it exhibits ambiguity in that certain values can be
 214 /// encoded in several different ways, which we must check for at deserialization-time. Thus, if
 215 /// you're looking for an example of a variable-length integer to use for your own project, move
 216 /// along, this is a rather poor design.
 217 pub(crate) struct BigSize(pub u64);
 218 impl Writeable for BigSize {
 219         #[inline]
 220         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 221                 match self.0 {
 222                         0...0xFC => {
 223                                 (self.0 as u8).write(writer)
 224                         },
 225                         0xFD...0xFFFF => {
 226                                 0xFDu8.write(writer)?;
 227                                 (self.0 as u16).write(writer)
 228                         },
 229                         0x10000...0xFFFFFFFF => {
 230                                 0xFEu8.write(writer)?;
 231                                 (self.0 as u32).write(writer)
 232                         },
 233                         _ => {
 234                                 0xFFu8.write(writer)?;
 235                                 (self.0 as u64).write(writer)
 236                         },
 237                 }
 238         }
 239 }
 240 impl<R: Read> Readable<R> for BigSize {
 241         #[inline]
 242         fn read(reader: &mut R) -> Result<BigSize, DecodeError> {
 243                 let n: u8 = Readable::read(reader)?;
 244                 match n {
 245                         0xFF => {
 246                                 let x: u64 = Readable::read(reader)?;
 247                                 if x < 0x100000000 {
 248                                         Err(DecodeError::InvalidValue)
 249                                 } else {
 250                                         Ok(BigSize(x))
 251                                 }
 252                         }
 253                         0xFE => {
 254                                 let x: u32 = Readable::read(reader)?;
 255                                 if x < 0x10000 {
 256                                         Err(DecodeError::InvalidValue)
 257                                 } else {
 258                                         Ok(BigSize(x as u64))
 259                                 }
 260                         }
 261                         0xFD => {
 262                                 let x: u16 = Readable::read(reader)?;
 263                                 if x < 0xFD {
 264                                         Err(DecodeError::InvalidValue)
 265                                 } else {
 266                                         Ok(BigSize(x as u64))
 267                                 }
 268                         }
 269                         n => Ok(BigSize(n as u64))
 270                 }
 271         }
 272 }
 273
 274 /// In TLV we occasionally send fields which only consist of, or potentially end with, a
 275 /// variable-length integer which is simply truncated by skipping high zero bytes. This type
 276 /// encapsulates such integers implementing Readable/Writeable for them.
 277 #[cfg_attr(test, derive(PartialEq, Debug))]
 278 pub(crate) struct HighZeroBytesDroppedVarInt<T>(pub T);
 279
 280 macro_rules! impl_writeable_primitive {
 281         ($val_type:ty, $meth_write:ident, $len: expr, $meth_read:ident) => {
 282                 impl Writeable for $val_type {
 283                         #[inline]
 284                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 285                                 writer.write_all(&$meth_write(*self))
 286                         }
 287                 }
 288                 impl Writeable for HighZeroBytesDroppedVarInt<$val_type> {
 289                         #[inline]
 290                         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 291                                 // Skip any full leading 0 bytes when writing (in BE):
 292                                 writer.write_all(&$meth_write(self.0)[(self.0.leading_zeros()/8) as usize..$len])
 293                         }
 294                 }
 295                 impl<R: Read> Readable<R> for $val_type {
 296                         #[inline]
 297                         fn read(reader: &mut R) -> Result<$val_type, DecodeError> {
 298                                 let mut buf = [0; $len];
 299                                 reader.read_exact(&mut buf)?;
 300                                 Ok($meth_read(&buf))
 301                         }
 302                 }
 303                 impl<R: Read> Readable<R> for HighZeroBytesDroppedVarInt<$val_type> {
 304                         #[inline]
 305                         fn read(reader: &mut R) -> Result<HighZeroBytesDroppedVarInt<$val_type>, DecodeError> {
 306                                 // We need to accept short reads (read_len == 0) as "EOF" and handle them as simply
 307                                 // the high bytes being dropped. To do so, we start reading into the middle of buf
 308                                 // and then convert the appropriate number of bytes with extra high bytes out of
 309                                 // buf.
 310                                 let mut buf = [0; $len*2];
 311                                 let mut read_len = reader.read(&mut buf[$len..])?;
 312                                 let mut total_read_len = read_len;
 313                                 while read_len != 0 && total_read_len != $len {
 314                                         read_len = reader.read(&mut buf[($len + total_read_len)..])?;
 315                                         total_read_len += read_len;
 316                                 }
 317                                 if total_read_len == 0 || buf[$len] != 0 {
 318                                         let first_byte = $len - ($len - total_read_len);
 319                                         Ok(HighZeroBytesDroppedVarInt($meth_read(&buf[first_byte..first_byte + $len])))
 320                                 } else {
 321                                         // If the encoding had extra zero bytes, return a failure even though we know
 322                                         // what they meant (as the TLV test vectors require this)
 323                                         Err(DecodeError::InvalidValue)
 324                                 }
 325                         }
 326                 }
 327         }
 328 }
 329
 330 impl_writeable_primitive!(u64, be64_to_array, 8, slice_to_be64);
 331 impl_writeable_primitive!(u32, be32_to_array, 4, slice_to_be32);
 332 impl_writeable_primitive!(u16, be16_to_array, 2, slice_to_be16);
 333
 334 impl Writeable for u8 {
 335         #[inline]
 336         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 337                 writer.write_all(&[*self])
 338         }
 339 }
 340 impl<R: Read> Readable<R> for u8 {
 341         #[inline]
 342         fn read(reader: &mut R) -> Result<u8, DecodeError> {
 343                 let mut buf = [0; 1];
 344                 reader.read_exact(&mut buf)?;
 345                 Ok(buf[0])
 346         }
 347 }
 348
 349 impl Writeable for bool {
 350         #[inline]
 351         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 352                 writer.write_all(&[if *self {1} else {0}])
 353         }
 354 }
 355 impl<R: Read> Readable<R> for bool {
 356         #[inline]
 357         fn read(reader: &mut R) -> Result<bool, DecodeError> {
 358                 let mut buf = [0; 1];
 359                 reader.read_exact(&mut buf)?;
 360                 if buf[0] != 0 && buf[0] != 1 {
 361                         return Err(DecodeError::InvalidValue);
 362                 }
 363                 Ok(buf[0] == 1)
 364         }
 365 }
 366
 367 // u8 arrays
 368 macro_rules! impl_array {
 369         ( $size:expr ) => (
 370                 impl Writeable for [u8; $size]
 371                 {
 372                         #[inline]
 373                         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 374                                 w.write_all(self)
 375                         }
 376                 }
 377
 378                 impl<R: Read> Readable<R> for [u8; $size]
 379                 {
 380                         #[inline]
 381                         fn read(r: &mut R) -> Result<Self, DecodeError> {
 382                                 let mut buf = [0u8; $size];
 383                                 r.read_exact(&mut buf)?;
 384                                 Ok(buf)
 385                         }
 386                 }
 387         );
 388 }
 389
 390 //TODO: performance issue with [u8; size] with impl_array!()
 391 impl_array!(3); // for rgb
 392 impl_array!(4); // for IPv4
 393 impl_array!(10); // for OnionV2
 394 impl_array!(16); // for IPv6
 395 impl_array!(32); // for channel id & hmac
 396 impl_array!(33); // for PublicKey
 397 impl_array!(64); // for Signature
 398 impl_array!(1300); // for OnionPacket.hop_data
 399
 400 // HashMap
 401 impl<K, V> Writeable for HashMap<K, V>
 402         where K: Writeable + Eq + Hash,
 403               V: Writeable
 404 {
 405         #[inline]
 406         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 407         (self.len() as u16).write(w)?;
 408                 for (key, value) in self.iter() {
 409                         key.write(w)?;
 410                         value.write(w)?;
 411                 }
 412                 Ok(())
 413         }
 414 }
 415
 416 impl<R, K, V> Readable<R> for HashMap<K, V>
 417         where R: Read,
 418               K: Readable<R> + Eq + Hash,
 419               V: Readable<R>
 420 {
 421         #[inline]
 422         fn read(r: &mut R) -> Result<Self, DecodeError> {
 423                 let len: u16 = Readable::read(r)?;
 424                 let mut ret = HashMap::with_capacity(len as usize);
 425                 for _ in 0..len {
 426                         ret.insert(K::read(r)?, V::read(r)?);
 427                 }
 428                 Ok(ret)
 429         }
 430 }
 431
 432 // Vectors
 433 impl Writeable for Vec<u8> {
 434         #[inline]
 435         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 436                 (self.len() as u16).write(w)?;
 437                 w.write_all(&self)
 438         }
 439 }
 440
 441 impl<R: Read> Readable<R> for Vec<u8> {
 442         #[inline]
 443         fn read(r: &mut R) -> Result<Self, DecodeError> {
 444                 let len: u16 = Readable::read(r)?;
 445                 let mut ret = Vec::with_capacity(len as usize);
 446                 ret.resize(len as usize, 0);
 447                 r.read_exact(&mut ret)?;
 448                 Ok(ret)
 449         }
 450 }
 451 impl Writeable for Vec<Signature> {
 452         #[inline]
 453         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 454                 (self.len() as u16).write(w)?;
 455                 for e in self.iter() {
 456                         e.write(w)?;
 457                 }
 458                 Ok(())
 459         }
 460 }
 461
 462 impl<R: Read> Readable<R> for Vec<Signature> {
 463         #[inline]
 464         fn read(r: &mut R) -> Result<Self, DecodeError> {
 465                 let len: u16 = Readable::read(r)?;
 466                 let byte_size = (len as usize)
 467                                 .checked_mul(33)
 468                                 .ok_or(DecodeError::BadLengthDescriptor)?;
 469                 if byte_size > MAX_BUF_SIZE {
 470                         return Err(DecodeError::BadLengthDescriptor);
 471                 }
 472                 let mut ret = Vec::with_capacity(len as usize);
 473                 for _ in 0..len { ret.push(Signature::read(r)?); }
 474                 Ok(ret)
 475         }
 476 }
 477
 478 impl Writeable for Script {
 479         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 480                 (self.len() as u16).write(w)?;
 481                 w.write_all(self.as_bytes())
 482         }
 483 }
 484
 485 impl<R: Read> Readable<R> for Script {
 486         fn read(r: &mut R) -> Result<Self, DecodeError> {
 487                 let len = <u16 as Readable<R>>::read(r)? as usize;
 488                 let mut buf = vec![0; len];
 489                 r.read_exact(&mut buf)?;
 490                 Ok(Script::from(buf))
 491         }
 492 }
 493
 494 impl Writeable for PublicKey {
 495         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 496                 self.serialize().write(w)
 497         }
 498 }
 499
 500 impl<R: Read> Readable<R> for PublicKey {
 501         fn read(r: &mut R) -> Result<Self, DecodeError> {
 502                 let buf: [u8; 33] = Readable::read(r)?;
 503                 match PublicKey::from_slice(&buf) {
 504                         Ok(key) => Ok(key),
 505                         Err(_) => return Err(DecodeError::InvalidValue),
 506                 }
 507         }
 508 }
 509
 510 impl Writeable for SecretKey {
 511         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 512                 let mut ser = [0; 32];
 513                 ser.copy_from_slice(&self[..]);
 514                 ser.write(w)
 515         }
 516 }
 517
 518 impl<R: Read> Readable<R> for SecretKey {
 519         fn read(r: &mut R) -> Result<Self, DecodeError> {
 520                 let buf: [u8; 32] = Readable::read(r)?;
 521                 match SecretKey::from_slice(&buf) {
 522                         Ok(key) => Ok(key),
 523                         Err(_) => return Err(DecodeError::InvalidValue),
 524                 }
 525         }
 526 }
 527
 528 impl Writeable for Sha256dHash {
 529         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 530                 w.write_all(&self[..])
 531         }
 532 }
 533
 534 impl<R: Read> Readable<R> for Sha256dHash {
 535         fn read(r: &mut R) -> Result<Self, DecodeError> {
 536                 use bitcoin_hashes::Hash;
 537
 538                 let buf: [u8; 32] = Readable::read(r)?;
 539                 Ok(Sha256dHash::from_slice(&buf[..]).unwrap())
 540         }
 541 }
 542
 543 impl Writeable for Signature {
 544         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 545                 self.serialize_compact().write(w)
 546         }
 547 }
 548
 549 impl<R: Read> Readable<R> for Signature {
 550         fn read(r: &mut R) -> Result<Self, DecodeError> {
 551                 let buf: [u8; 64] = Readable::read(r)?;
 552                 match Signature::from_compact(&buf) {
 553                         Ok(sig) => Ok(sig),
 554                         Err(_) => return Err(DecodeError::InvalidValue),
 555                 }
 556         }
 557 }
 558
 559 impl Writeable for PaymentPreimage {
 560         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 561                 self.0.write(w)
 562         }
 563 }
 564
 565 impl<R: Read> Readable<R> for PaymentPreimage {
 566         fn read(r: &mut R) -> Result<Self, DecodeError> {
 567                 let buf: [u8; 32] = Readable::read(r)?;
 568                 Ok(PaymentPreimage(buf))
 569         }
 570 }
 571
 572 impl Writeable for PaymentHash {
 573         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 574                 self.0.write(w)
 575         }
 576 }
 577
 578 impl<R: Read> Readable<R> for PaymentHash {
 579         fn read(r: &mut R) -> Result<Self, DecodeError> {
 580                 let buf: [u8; 32] = Readable::read(r)?;
 581                 Ok(PaymentHash(buf))
 582         }
 583 }
 584
 585 impl<T: Writeable> Writeable for Option<T> {
 586         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 587                 match *self {
 588                         None => 0u8.write(w)?,
 589                         Some(ref data) => {
 590                                 1u8.write(w)?;
 591                                 data.write(w)?;
 592                         }
 593                 }
 594                 Ok(())
 595         }
 596 }
 597
 598 impl<R, T> Readable<R> for Option<T>
 599         where R: Read,
 600               T: Readable<R>
 601 {
 602         fn read(r: &mut R) -> Result<Self, DecodeError> {
 603                 match <u8 as Readable<R>>::read(r)? {
 604                         0 => Ok(None),
 605                         1 => Ok(Some(Readable::read(r)?)),
 606                         _ => return Err(DecodeError::InvalidValue),
 607                 }
 608         }
 609 }
 610
 611 impl Writeable for OutPoint {
 612         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 613                 self.txid.write(w)?;
 614                 self.vout.write(w)?;
 615                 Ok(())
 616         }
 617 }
 618
 619 impl<R: Read> Readable<R> for OutPoint {
 620         fn read(r: &mut R) -> Result<Self, DecodeError> {
 621                 let txid = Readable::read(r)?;
 622                 let vout = Readable::read(r)?;
 623                 Ok(OutPoint {
 624                         txid,
 625                         vout,
 626                 })
 627         }
 628 }
 629
 630 impl Writeable for Transaction {
 631         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 632                 match self.consensus_encode(WriterWriteAdaptor(writer)) {
 633                         Ok(_) => Ok(()),
 634                         Err(consensus::encode::Error::Io(e)) => Err(e),
 635                         Err(_) => panic!("We shouldn't get a consensus::encode::Error unless our Write generated an std::io::Error"),
 636                 }
 637         }
 638 }
 639
 640 impl<R: Read> Readable<R> for Transaction {
 641         fn read(r: &mut R) -> Result<Self, DecodeError> {
 642                 match consensus::encode::Decodable::consensus_decode(r) {
 643                         Ok(t) => Ok(t),
 644                         Err(consensus::encode::Error::Io(ref e)) if e.kind() == ::std::io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
 645                         Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e)),
 646                         Err(_) => Err(DecodeError::InvalidValue),
 647                 }
 648         }
 649 }
 650
 651 impl<R: Read, T: Readable<R>> Readable<R> for Mutex<T> {
 652         fn read(r: &mut R) -> Result<Self, DecodeError> {
 653                 let t: T = Readable::read(r)?;
 654                 Ok(Mutex::new(t))
 655         }
 656 }
 657 impl<T: Writeable> Writeable for Mutex<T> {
 658         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 659                 self.lock().unwrap().write(w)
 660         }
 661 }
 662
 663 impl<R: Read, A: Readable<R>, B: Readable<R>> Readable<R> for (A, B) {
 664         fn read(r: &mut R) -> Result<Self, DecodeError> {
 665                 let a: A = Readable::read(r)?;
 666                 let b: B = Readable::read(r)?;
 667                 Ok((a, b))
 668         }
 669 }
 670 impl<A: Writeable, B: Writeable> Writeable for (A, B) {
 671         fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
 672                 self.0.write(w)?;
 673                 self.1.write(w)
 674         }
 675 }