Check data availability boundary in rpc request

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2486,7 +2486,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
 
         while let Some((_root, block)) = filtered_chain_segment.first() {
             // Determine the epoch of the first block in the remaining segment.
-            let start_epoch = block.slot().epoch(T::EthSpec::slots_per_epoch());
+            let start_epoch = block.epoch();
 
             // The `last_index` indicates the position of the first block in an epoch greater
             // than the current epoch: partitioning the blocks into a run of blocks in the same
@@ -2494,9 +2494,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             // the same `BeaconState`.
             let last_index = filtered_chain_segment
                 .iter()
-                .position(|(_root, block)| {
-                    block.slot().epoch(T::EthSpec::slots_per_epoch()) > start_epoch
-                })
+                .position(|(_root, block)| block.epoch() > start_epoch)
                 .unwrap_or(filtered_chain_segment.len());
 
             let mut blocks = filtered_chain_segment.split_off(last_index);
@@ -3162,7 +3160,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         // Sync aggregate.
         if let Ok(sync_aggregate) = block.body().sync_aggregate() {
             // `SyncCommittee` for the sync_aggregate should correspond to the duty slot
-            let duty_epoch = block.slot().epoch(T::EthSpec::slots_per_epoch());
+            let duty_epoch = block.epoch();
 
             match self.sync_committee_at_epoch(duty_epoch) {
                 Ok(sync_committee) => {
@@ -3429,7 +3427,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         parent_block_slot: Slot,
     ) {
         // Do not write to eth1 finalization cache for blocks older than 5 epochs.
-        if block.slot().epoch(T::EthSpec::slots_per_epoch()) + 5 < current_epoch {
+        if block.epoch() + 5 < current_epoch {
             return;
         }
 
@@ -5860,6 +5858,29 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             .flatten()
     }
 
+    /// The epoch since which we cater blob data upon a request 'ByRoot'.
+    /// `None` if the `Eip4844` fork is disabled.
+    pub fn data_availability_boundary_by_root_rpc_request(&self) -> Option<Epoch> {
+        self.spec
+            .eip4844_fork_epoch
+            .map(|fork_epoch| {
+                self.epoch().ok().map(|current_epoch| {
+                    vec![
+                        fork_epoch,
+                        current_epoch.saturating_sub(*MIN_EPOCHS_FOR_BLOBS_SIDECARS_REQUESTS),
+                        self.canonical_head
+                            .cached_head()
+                            .finalized_checkpoint()
+                            .epoch,
+                    ]
+                    .into_iter()
+                    .max()
+                })
+            })
+            .flatten()
+            .flatten()
+    }
+
     /// Returns `true` if we are at or past the `Eip4844` fork. This will always return `false` if
     /// the `Eip4844` fork is disabled.
     pub fn is_data_availability_check_required(&self) -> Result<bool, Error> {

beacon_node/network/src/beacon_processor/worker/rpc_methods.rs

@@ -246,19 +246,39 @@ impl<T: BeaconChainTypes> Worker<T> {
                                 "request_root" => ?root
                             );
                         }
-                        Ok((Some(_), None)) => {
+                        Ok((Some(block), None)) => {
+                            let data_availability_boundary_by_root = self.chain.data_availability_boundary_by_root_rpc_request();
+                            let block_epoch = block.epoch();
+
+                           if Some(block_epoch) >= data_availability_boundary_by_root {
                                 debug!(
                                     self.log,
-                                "Peer requested block and blob, but no blob found";
+                                    "Peer requested block and blob that should be available, but no blob found";
                                     "peer" => %peer_id,
-                                "request_root" => ?root
+                                    "request_root" => ?root,
+                                    "data_availability_boundary_by_root" => data_availability_boundary_by_root,
                                 );
                                 self.send_error_response(
                                     peer_id,
                                     RPCResponseErrorCode::ResourceUnavailable,
-                                "No blob for requested block".into(),
+                                    "No blob for requested block.".into(),
                                     request_id,
                                 );
+                            } else {
+                                debug!(
+                                    self.log,
+                                    "Peer requested block and blob older than the data availability boundary for ByRoot request, no blob found";
+                                    "peer" => %peer_id,
+                                    "request_root" => ?root,
+                                    "data_availability_boundary_by_root" => data_availability_boundary_by_root,
+                                );
+                                self.send_error_response(
+                                    peer_id,
+                                    RPCResponseErrorCode::ResourceUnavailable,
+                                    format!("No blob for requested block. Requested blob is older than the data availability boundary for a ByRoot request, currently at epoch {:?}", data_availability_boundary_by_root),
+                                    request_id,
+                                );
+                            }
                             send_response = false;
                             break;
                         }
@@ -592,15 +612,33 @@ impl<T: BeaconChainTypes> Worker<T> {
             "start_slot" => req.start_slot,
         );
 
+        let start_slot = Slot::from(req.start_slot);
+        let start_epoch = start_slot.epoch(T::EthSpec::slots_per_epoch());
+        let data_availability_boundary = self.chain.data_availability_boundary();
+
+        if Some(start_epoch) < data_availability_boundary {
+            let oldest_blob_slot = self
+                .chain
+                .store
+                .get_blob_info()
+                .map(|blob_info| blob_info.oldest_blob_slot);
+
+            debug!(self.log, "Range request start slot is older than data availability boundary"; "requested_slot" => req.start_slot, "oldest_known_slot" => ?oldest_blob_slot, "data_availability_boundary" => data_availability_boundary);
+
+            return self.send_error_response(
+                peer_id,
+                RPCResponseErrorCode::ResourceUnavailable,
+                format!("Requested start slot in epoch {}. Data availability boundary is currently at epoch {:?}", start_epoch, data_availability_boundary),
+                request_id,
+            );
+        }
+
         // Should not send more than max request blocks
         if req.count > MAX_REQUEST_BLOBS_SIDECARS {
             req.count = MAX_REQUEST_BLOBS_SIDECARS;
         }
 
-        let forwards_block_root_iter = match self
-            .chain
-            .forwards_iter_block_roots(Slot::from(req.start_slot))
-        {
+        let forwards_block_root_iter = match self.chain.forwards_iter_block_roots(start_slot) {
             Ok(iter) => iter,
             Err(BeaconChainError::HistoricalBlockError(
                 HistoricalBlockError::BlockOutOfRange {

consensus/types/src/signed_beacon_block.rs

@@ -195,7 +195,7 @@ impl<E: EthSpec, Payload: AbstractExecPayload<E>> SignedBeaconBlock<E, Payload>
         }
 
         let domain = spec.get_domain(
-            self.slot().epoch(E::slots_per_epoch()),
+            self.epoch(),
             Domain::BeaconProposer,
             fork,
             genesis_validators_root,
@@ -227,6 +227,11 @@ impl<E: EthSpec, Payload: AbstractExecPayload<E>> SignedBeaconBlock<E, Payload>
         self.message().slot()
     }
 
+    /// Convenience accessor for the block's epoch.
+    pub fn epoch(&self) -> Epoch {
+        self.message().slot().epoch(E::slots_per_epoch())
+    }
+
     /// Convenience accessor for the block's parent root.
     pub fn parent_root(&self) -> Hash256 {
         self.message().parent_root()

consensus/types/src/signed_block_and_blobs.rs

@@ -1,5 +1,7 @@
 use crate::signed_beacon_block::BlobReconstructionError;
-use crate::{BlobsSidecar, EthSpec, Hash256, SignedBeaconBlock, SignedBeaconBlockEip4844, Slot};
+use crate::{
+    BlobsSidecar, Epoch, EthSpec, Hash256, SignedBeaconBlock, SignedBeaconBlockEip4844, Slot,
+};
 use derivative::Derivative;
 use serde_derive::{Deserialize, Serialize};
 use ssz::{Decode, DecodeError};
@@ -74,6 +76,14 @@ impl<T: EthSpec> BlockWrapper<T> {
             }
         }
     }
+    pub fn epoch(&self) -> Epoch {
+        match &self.0 {
+            BlockWrapperInner::Block(block) => block.epoch(),
+            BlockWrapperInner::BlockAndBlob(block_sidecar_pair) => {
+                block_sidecar_pair.beacon_block.epoch()
+            }
+        }
+    }
     pub fn block(&self) -> &SignedBeaconBlock<T> {
         match &self.0 {
             BlockWrapperInner::Block(block) => &block,