clean up blob by root response (#4136)

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -1023,7 +1023,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         )
     }
 
-    pub async fn get_blobs_checking_early_attester_cache(
+    pub fn get_blobs_checking_early_attester_cache(
         &self,
         block_root: &Hash256,
     ) -> Result<Option<BlobSidecarList<T::EthSpec>>, Error> {

beacon_node/beacon_chain/src/data_availability_checker.rs

@@ -112,6 +112,11 @@ impl<T: EthSpec, S: SlotClock> DataAvailabilityChecker<T, S> {
         }
     }
 
+    /// Get a blob from the RPC cache.
+    pub fn get_blob(&self, blob_id: &BlobIdentifier) -> Option<Arc<BlobSidecar<T>>> {
+        self.rpc_blob_cache.read().get(blob_id).cloned()
+    }
+
     /// This first validate the KZG commitments included in the blob sidecar.
     /// Check if we've cached other blobs for this block. If it completes a set and we also
     /// have a block cached, return the Availability variant triggering block import.

beacon_node/beacon_chain/src/early_attester_cache.rs

@@ -22,7 +22,6 @@ pub struct CacheItem<E: EthSpec> {
      * Values used to make the block available.
      */
     block: Arc<SignedBeaconBlock<E>>,
-    //TODO(sean) remove this and just use the da checker?'
     blobs: Option<BlobSidecarList<E>>,
     proto_block: ProtoBlock,
 }

beacon_node/beacon_chain/src/errors.rs

@@ -213,9 +213,6 @@ pub enum BeaconChainError {
     BlsToExecutionConflictsWithPool,
     InconsistentFork(InconsistentFork),
     ProposerHeadForkChoiceError(fork_choice::Error<proto_array::Error>),
-    BlobsUnavailable,
-    NoKzgCommitmentsFieldOnBlock,
-    BlobsOlderThanDataAvailabilityBoundary(Epoch),
 }
 
 easy_from_to!(SlotProcessingError, BeaconChainError);