Implement /eth/v1/beacon/blobs endpoint (#8103)

* #8085


  


Co-Authored-By: Tan Chee Keong <tanck@sigmaprime.io>

Co-Authored-By: chonghe <44791194+chong-he@users.noreply.github.com>

consensus/types/src/beacon_response.rs

@@ -25,6 +25,7 @@ pub struct ForkVersionedResponse<T, M = EmptyMetadata> {
 /// `Deserialize`.
 #[derive(Debug, PartialEq, Clone, Serialize)]
 pub struct UnversionedResponse<T, M = EmptyMetadata> {
+    #[serde(flatten)]
     pub metadata: M,
     pub data: T,
 }
@@ -195,9 +196,10 @@ impl<T, M> From<UnversionedResponse<T, M>> for BeaconResponse<T, M> {
 
 #[cfg(test)]
 mod fork_version_response_tests {
+    use crate::beacon_response::ExecutionOptimisticFinalizedMetadata;
     use crate::{
         ExecutionPayload, ExecutionPayloadBellatrix, ForkName, ForkVersionedResponse,
-        MainnetEthSpec,
+        MainnetEthSpec, UnversionedResponse,
     };
     use serde_json::json;
 
@@ -236,4 +238,24 @@ mod fork_version_response_tests {
 
         assert!(result.is_err());
     }
+
+    // The following test should only pass by having the attribute #[serde(flatten)] on the metadata
+    #[test]
+    fn unversioned_response_serialize_dezerialize_round_trip_test() {
+        // Create an UnversionedResponse with some data
+        let data = UnversionedResponse {
+            metadata: ExecutionOptimisticFinalizedMetadata {
+                execution_optimistic: Some(false),
+                finalized: Some(false),
+            },
+            data: "some_test_data".to_string(),
+        };
+
+        let serialized = serde_json::to_string(&data);
+
+        let deserialized =
+            serde_json::from_str(&serialized.unwrap()).expect("Failed to deserialize");
+
+        assert_eq!(data, deserialized);
+    }
 }