Split impl_for_vec ser macro into read/write variants

We need to (de)serialize vecs of BlindedPaths differently based on whether
we're writing or reading, used in the next commit

Author: valentinewallace

lightning/src/util/ser.rs

@@ -746,7 +746,7 @@ where T: Readable + Eq + Hash
 }
 
 // Vectors
-macro_rules! impl_for_vec {
+macro_rules! impl_writeable_for_vec {
 	($ty: ty $(, $name: ident)*) => {
 		impl<$($name : Writeable),*> Writeable for Vec<$ty> {
 			#[inline]
@@ -758,7 +758,10 @@ macro_rules! impl_for_vec {
 				Ok(())
 			}
 		}
-
+	}
+}
+macro_rules! impl_readable_for_vec {
+	($ty: ty $(, $name: ident)*) => {
 		impl<$($name : Readable),*> Readable for Vec<$ty> {
 			#[inline]
 			fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
@@ -799,9 +802,12 @@ impl Readable for Vec<u8> {
 	}
 }
 
-impl_for_vec!(ecdsa::Signature);
-impl_for_vec!(crate::ln::channelmanager::MonitorUpdateCompletionAction);
-impl_for_vec!((A, B), A, B);
+impl_writeable_for_vec!(ecdsa::Signature);
+impl_readable_for_vec!(ecdsa::Signature);
+impl_writeable_for_vec!(crate::ln::channelmanager::MonitorUpdateCompletionAction);
+impl_readable_for_vec!(crate::ln::channelmanager::MonitorUpdateCompletionAction);
+impl_writeable_for_vec!((A, B), A, B);
+impl_readable_for_vec!((A, B), A, B);
 
 impl Writeable for Script {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {