Gloas gossip boilerplate (#8700)

All the required boilerplate for gloas gossip. We'll include the gossip message processing logic in a separate PR


  


Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

consensus/types/src/builder/mod.rs

@@ -2,6 +2,7 @@ mod builder;
 mod builder_bid;
 mod builder_pending_payment;
 mod builder_pending_withdrawal;
+mod proposer_preferences;
 
 pub use builder::{Builder, BuilderIndex};
 pub use builder_bid::{
@@ -10,3 +11,4 @@ pub use builder_bid::{
 };
 pub use builder_pending_payment::BuilderPendingPayment;
 pub use builder_pending_withdrawal::BuilderPendingWithdrawal;
+pub use proposer_preferences::{ProposerPreferences, SignedProposerPreferences};

consensus/types/src/builder/proposer_preferences.rs

@@ -0,0 +1,51 @@
+use crate::test_utils::TestRandom;
+use crate::{Address, ForkName, SignedRoot, Slot};
+use bls::Signature;
+use context_deserialize::context_deserialize;
+use educe::Educe;
+use serde::{Deserialize, Serialize};
+use ssz_derive::{Decode, Encode};
+use test_random_derive::TestRandom;
+use tree_hash_derive::TreeHash;
+
+#[derive(
+    Default, Debug, Clone, Serialize, Encode, Decode, Deserialize, TreeHash, Educe, TestRandom,
+)]
+#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
+#[educe(PartialEq, Hash)]
+#[context_deserialize(ForkName)]
+// https://github.com/ethereum/consensus-specs/blob/master/specs/gloas/p2p-interface.md#new-proposerpreferences
+pub struct ProposerPreferences {
+    pub proposal_slot: Slot,
+    pub validator_index: u64,
+    pub fee_recipient: Address,
+    pub gas_limit: u64,
+}
+
+impl SignedRoot for ProposerPreferences {}
+
+#[derive(TestRandom, TreeHash, Debug, Clone, Encode, Decode, Serialize, Deserialize, Educe)]
+#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
+#[educe(PartialEq, Hash)]
+#[context_deserialize(ForkName)]
+// https://github.com/ethereum/consensus-specs/blob/master/specs/gloas/p2p-interface.md#new-signedproposerpreferences
+pub struct SignedProposerPreferences {
+    pub message: ProposerPreferences,
+    pub signature: Signature,
+}
+
+impl SignedProposerPreferences {
+    pub fn empty() -> Self {
+        Self {
+            message: ProposerPreferences::default(),
+            signature: Signature::empty(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    ssz_and_tree_hash_tests!(ProposerPreferences);
+}