Add version and TLV suffix for more user-facing "major" structs

Author: TheBlueMatt

lightning/src/chain/keysinterface.rs

@@ -704,10 +704,15 @@ impl BaseSign for InMemorySigner {
 	}
 }
 
+const SERIALIZATION_VERSION: u8 = 1;
+const MIN_SERIALIZATION_VERSION: u8 = 1;
+
 impl Sign for InMemorySigner {}
 
 impl Writeable for InMemorySigner {
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), Error> {
+		write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
+
 		self.funding_key.write(writer)?;
 		self.revocation_base_key.write(writer)?;
 		self.payment_key.write(writer)?;
@@ -718,12 +723,16 @@ impl Writeable for InMemorySigner {
 		self.channel_value_satoshis.write(writer)?;
 		self.channel_keys_id.write(writer)?;
 
+		write_tlv_fields!(writer, {}, {});
+
 		Ok(())
 	}
 }
 
 impl Readable for InMemorySigner {
 	fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
+		let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
+
 		let funding_key = Readable::read(reader)?;
 		let revocation_base_key = Readable::read(reader)?;
 		let payment_key = Readable::read(reader)?;
@@ -739,6 +748,8 @@ impl Readable for InMemorySigner {
 			                                     &htlc_base_key);
 		let keys_id = Readable::read(reader)?;
 
+		read_tlv_fields!(reader, {}, {});
+
 		Ok(InMemorySigner {
 			funding_key,
 			revocation_base_key,

lightning/src/routing/network_graph.rs

@@ -660,8 +660,13 @@ impl Readable for NodeInfo {
 	}
 }
 
+const SERIALIZATION_VERSION: u8 = 1;
+const MIN_SERIALIZATION_VERSION: u8 = 1;
+
 impl Writeable for NetworkGraph {
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+		write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
+
 		self.genesis_hash.write(writer)?;
 		(self.channels.len() as u64).write(writer)?;
 		for (ref chan_id, ref chan_info) in self.channels.iter() {
@@ -673,12 +678,16 @@ impl Writeable for NetworkGraph {
 			node_id.write(writer)?;
 			node_info.write(writer)?;
 		}
+
+		write_tlv_fields!(writer, {}, {});
 		Ok(())
 	}
 }
 
 impl Readable for NetworkGraph {
 	fn read<R: ::std::io::Read>(reader: &mut R) -> Result<NetworkGraph, DecodeError> {
+		let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
+
 		let genesis_hash: BlockHash = Readable::read(reader)?;
 		let channels_count: u64 = Readable::read(reader)?;
 		let mut channels = BTreeMap::new();
@@ -694,6 +703,8 @@ impl Readable for NetworkGraph {
 			let node_info = Readable::read(reader)?;
 			nodes.insert(node_id, node_info);
 		}
+		read_tlv_fields!(reader, {}, {});
+
 		Ok(NetworkGraph {
 			genesis_hash,
 			channels,

lightning/src/routing/router.rs

@@ -95,23 +95,30 @@ pub struct Route {
 	pub paths: Vec<Vec<RouteHop>>,
 }
 
+const SERIALIZATION_VERSION: u8 = 1;
+const MIN_SERIALIZATION_VERSION: u8 = 1;
+
 impl Writeable for Route {
 	fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+		write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
 		(self.paths.len() as u64).write(writer)?;
 		for hops in self.paths.iter() {
 			hops.write(writer)?;
 		}
+		write_tlv_fields!(writer, {}, {});
 		Ok(())
 	}
 }
 
 impl Readable for Route {
 	fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Route, DecodeError> {
+		let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
 		let path_count: u64 = Readable::read(reader)?;
 		let mut paths = Vec::with_capacity(cmp::min(path_count, 128) as usize);
 		for _ in 0..path_count {
 			paths.push(Readable::read(reader)?);
 		}
+		read_tlv_fields!(reader, {}, {});
 		Ok(Route { paths })
 	}
 }

lightning/src/util/enforcing_trait_impls.rs

@@ -38,6 +38,9 @@ pub const INITIAL_REVOKED_COMMITMENT_NUMBER: u64 = 1 << 48;
 ///
 /// Eventually we will probably want to expose a variant of this which would essentially
 /// be what you'd want to run on a hardware wallet.
+///
+/// Note that before we do so we should ensure its serialization format has backwards- and
+/// forwards-compatibility prefix/suffixes!
 #[derive(Clone)]
 pub struct EnforcingSigner {
 	pub inner: InMemorySigner,