Implement Readable/Writeable for Events

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

diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index 1b98e341fad6f35e94e555528865ed1cee508b5a..96936fe95416fd06a1061e323dbbe1952cb09c09 100644 (file)
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -11,7 +11,9 @@ use std::cmp;
 use secp256k1::Signature;
 use secp256k1::key::{PublicKey, SecretKey};
 use bitcoin::blockdata::script::Script;
-use bitcoin::blockdata::transaction::OutPoint;
+use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
+use bitcoin::consensus;
+use bitcoin::consensus::Encodable;
 use bitcoin_hashes::sha256d::Hash as Sha256dHash;
 use std::marker::Sized;
 use ln::msgs::DecodeError;
@@ -189,6 +191,15 @@ pub trait ReadableArgs<R, P>
        fn read(reader: &mut R, params: P) -> Result<Self, DecodeError>;
 }
 
+/// A trait that various rust-lightning types implement allowing them to (maybe) be read in from a Read
+pub trait MaybeReadable<R>
+       where Self: Sized,
+             R: Read
+{
+       /// Reads a Self in from the given Read
+       fn read(reader: &mut R) -> Result<Option<Self>, DecodeError>;
+}
+
 pub(crate) struct U48(pub u64);
 impl Writeable for U48 {
        #[inline]
@@ -625,6 +636,33 @@ impl<R: Read> Readable<R> for OutPoint {
        }
 }
 
+macro_rules! impl_consensus_ser {
+       ($bitcoin_type: ty) => {
+               impl Writeable for $bitcoin_type {
+                       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+                               match self.consensus_encode(WriterWriteAdaptor(writer)) {
+                                       Ok(_) => Ok(()),
+                                       Err(consensus::encode::Error::Io(e)) => Err(e),
+                                       Err(_) => panic!("We shouldn't get a consensus::encode::Error unless our Write generated an std::io::Error"),
+                               }
+                       }
+               }
+
+               impl<R: Read> Readable<R> for $bitcoin_type {
+                       fn read(r: &mut R) -> Result<Self, DecodeError> {
+                               match consensus::encode::Decodable::consensus_decode(r) {
+                                       Ok(t) => Ok(t),
+                                       Err(consensus::encode::Error::Io(ref e)) if e.kind() == ::std::io::ErrorKind::UnexpectedEof => Err(DecodeError::ShortRead),
+                                       Err(consensus::encode::Error::Io(e)) => Err(DecodeError::Io(e)),
+                                       Err(_) => Err(DecodeError::InvalidValue),
+                               }
+                       }
+               }
+       }
+}
+impl_consensus_ser!(Transaction);
+impl_consensus_ser!(TxOut);
+
 impl<R: Read, T: Readable<R>> Readable<R> for Mutex<T> {
        fn read(r: &mut R) -> Result<Self, DecodeError> {
                let t: T = Readable::read(r)?;