From f5b6e7f58a108ae2394bda4ef98650cb4a50597e Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Sun, 3 Oct 2021 00:46:10 +0000
Subject: [PATCH] Implement `HashMap` read for `MaybeReadable` values

This allows us to read a `HashMap` that has values which may be
skipped if they are some backwards-compatibility type.

We also take this opportunity to fail deserialization if keys are
duplicated.
---
 lightning/src/util/ser.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index 47bdf04f8..ba8a9fd0d 100644
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -502,14 +502,20 @@ impl<K, V> Writeable for HashMap<K, V>
 
 impl<K, V> Readable for HashMap<K, V>
 	where K: Readable + Eq + Hash,
-	      V: Readable
+	      V: MaybeReadable
 {
 	#[inline]
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 		let len: u16 = Readable::read(r)?;
 		let mut ret = HashMap::with_capacity(len as usize);
 		for _ in 0..len {
-			ret.insert(K::read(r)?, V::read(r)?);
+			let k = K::read(r)?;
+			let v_opt = V::read(r)?;
+			if let Some(v) = v_opt {
+				if ret.insert(k, v).is_some() {
+					return Err(DecodeError::InvalidValue);
+				}
+			}
 		}
 		Ok(ret)
 	}
-- 
2.39.5