feat: make downloaders and clients generic over block parts (#12469)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/primitives-traits/src/block/header.rs

@@ -5,6 +5,8 @@ use core::fmt;
 use alloy_primitives::Sealable;
 use reth_codecs::Compact;
 
+use crate::InMemorySize;
+
 /// Helper trait that unifies all behaviour required by block header to support full node
 /// operations.
 pub trait FullBlockHeader: BlockHeader + Compact {}
@@ -21,12 +23,11 @@ pub trait BlockHeader:
     + fmt::Debug
     + PartialEq
     + Eq
-    + serde::Serialize
-    + for<'de> serde::Deserialize<'de>
     + alloy_rlp::Encodable
     + alloy_rlp::Decodable
     + alloy_consensus::BlockHeader
     + Sealable
+    + InMemorySize
 {
 }
 
@@ -45,5 +46,6 @@ impl<T> BlockHeader for T where
         + alloy_rlp::Decodable
         + alloy_consensus::BlockHeader
         + Sealable
+        + InMemorySize
 {
 }

crates/primitives-traits/src/header/sealed.rs

@@ -56,10 +56,10 @@ impl<H> SealedHeader<H> {
     }
 }
 
-impl SealedHeader {
+impl<H: alloy_consensus::BlockHeader> SealedHeader<H> {
     /// Return the number hash tuple.
     pub fn num_hash(&self) -> BlockNumHash {
-        BlockNumHash::new(self.number, self.hash)
+        BlockNumHash::new(self.number(), self.hash)
     }
 }
 

crates/primitives-traits/src/size.rs

@@ -3,3 +3,9 @@ pub trait InMemorySize {
     /// Returns a heuristic for the in-memory size of a struct.
     fn size(&self) -> usize;
 }
+
+impl InMemorySize for alloy_consensus::Header {
+    fn size(&self) -> usize {
+        self.size()
+    }
+}