Refactor deneb networking (#4561)

* Revert "fix merge"

This reverts commit 405e95b0ce.

* refactor deneb block processing

* cargo fmt

* make block and blob single lookups generic

* get tests compiling

* clean up everything add child component, fix peer scoring and retry logic

* smol cleanup and a bugfix

* remove ParentLookupReqId

* Update beacon_node/network/src/sync/manager.rs

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

* Update beacon_node/network/src/sync/manager.rs

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

* update unreachables to crits

* Revert "update unreachables to crits"

This reverts commit 064bf64dff86b3229316aeed0431c3f4251571a5.

* update make request/build request to make more sense

* pr feedback

* Update beacon_node/network/src/sync/block_lookups/mod.rs

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

* Update beacon_node/network/src/sync/block_lookups/mod.rs

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

* more pr feedback, fix availability check error handling

* improve block component processed log

---------

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/beacon_chain/src/block_verification_types.rs

@@ -6,8 +6,10 @@ use crate::eth1_finalization_cache::Eth1FinalizationData;
 use crate::{data_availability_checker, GossipVerifiedBlock, PayloadVerificationOutcome};
 use derivative::Derivative;
 use ssz_derive::{Decode, Encode};
+use ssz_types::VariableList;
 use state_processing::ConsensusContext;
 use std::sync::Arc;
+use types::blob_sidecar::FixedBlobSidecarList;
 use types::{
     blob_sidecar::BlobIdentifier, ssz_tagged_beacon_state, ssz_tagged_signed_beacon_block,
     ssz_tagged_signed_beacon_block_arc,
@@ -73,6 +75,22 @@ impl<E: EthSpec> RpcBlock<E> {
         Ok(Self { block: inner })
     }
 
+    pub fn new_from_fixed(
+        block: Arc<SignedBeaconBlock<E>>,
+        blobs: FixedBlobSidecarList<E>,
+    ) -> Result<Self, AvailabilityCheckError> {
+        let filtered = blobs
+            .into_iter()
+            .filter_map(|b| b.clone())
+            .collect::<Vec<_>>();
+        let blobs = if filtered.is_empty() {
+            None
+        } else {
+            Some(VariableList::from(filtered))
+        };
+        Self::new(block, blobs)
+    }
+
     pub fn deconstruct(self) -> (Arc<SignedBeaconBlock<E>>, Option<BlobSidecarList<E>>) {
         match self.block {
             RpcBlockInner::Block(block) => (block, None),

beacon_node/beacon_chain/src/data_availability_checker.rs

@@ -41,7 +41,6 @@ pub enum AvailabilityCheckError {
         num_blobs: usize,
     },
     MissingBlobs,
-    TxKzgCommitmentMismatch(String),
     KzgCommitmentMismatch {
         blob_index: u64,
     },

beacon_node/network/src/network_beacon_processor/gossip_methods.rs

@@ -1169,7 +1169,6 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                     AvailabilityCheckError::Kzg(_)
                     | AvailabilityCheckError::KzgVerificationFailed
                     | AvailabilityCheckError::NumBlobsMismatch { .. }
-                    | AvailabilityCheckError::TxKzgCommitmentMismatch(_)
                     | AvailabilityCheckError::BlobIndexInvalid(_)
                     | AvailabilityCheckError::UnorderedBlobs { .. }
                     | AvailabilityCheckError::BlockBlobRootMismatch { .. }

beacon_node/network/src/network_beacon_processor/mod.rs

@@ -434,6 +434,10 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
         seen_timestamp: Duration,
         process_type: BlockProcessType,
     ) -> Result<(), Error<T::EthSpec>> {
+        let blob_count = blobs.iter().filter(|b| b.is_some()).count();
+        if blob_count == 0 {
+            return Ok(());
+        }
         let process_fn = self.clone().generate_rpc_blobs_process_fn(
             block_root,
             blobs,

beacon_node/network/src/network_beacon_processor/sync_methods.rs

@@ -1,6 +1,5 @@
 use crate::metrics;
 use crate::network_beacon_processor::{NetworkBeaconProcessor, FUTURE_SLOT_TOLERANCE};
-use crate::sync::manager::ResponseType;
 use crate::sync::BatchProcessResult;
 use crate::sync::{
     manager::{BlockProcessType, SyncMessage},
@@ -96,7 +95,6 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
             self.send_sync_message(SyncMessage::BlockComponentProcessed {
                 process_type,
                 result: crate::sync::manager::BlockProcessingResult::Ignored,
-                response_type: crate::sync::manager::ResponseType::Block,
             });
         };
         (process_fn, Box::new(ignore_fn))
@@ -249,7 +247,6 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
         self.send_sync_message(SyncMessage::BlockComponentProcessed {
             process_type,
             result: result.into(),
-            response_type: ResponseType::Block,
         });
 
         // Drop the handle to remove the entry from the cache
@@ -301,7 +298,6 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
         self.send_sync_message(SyncMessage::BlockComponentProcessed {
             process_type,
             result: result.into(),
-            response_type: ResponseType::Blob,
         });
     }
 

beacon_node/network/src/router.rs

@@ -21,7 +21,7 @@ use lighthouse_network::{
     MessageId, NetworkGlobals, PeerId, PeerRequestId, PubsubMessage, Request, Response,
 };
 use logging::TimeLatch;
-use slog::{debug, o, trace};
+use slog::{crit, debug, o, trace};
 use slog::{error, warn};
 use std::sync::Arc;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
@@ -482,15 +482,22 @@ impl<T: BeaconChainTypes> Router<T> {
     ) {
         let request_id = match request_id {
             RequestId::Sync(sync_id) => match sync_id {
-                SyncId::SingleBlock { .. } | SyncId::ParentLookup { .. } => {
+                SyncId::SingleBlock { .. }
-                    unreachable!("Block lookups do not request BBRange requests")
+                | SyncId::SingleBlob { .. }
+                | SyncId::ParentLookup { .. }
+                | SyncId::ParentLookupBlob { .. } => {
+                    crit!(self.log, "Block lookups do not request BBRange requests"; "peer_id" => %peer_id);
+                    return;
                 }
                 id @ (SyncId::BackFillBlocks { .. }
                 | SyncId::RangeBlocks { .. }
                 | SyncId::BackFillBlockAndBlobs { .. }
                 | SyncId::RangeBlockAndBlobs { .. }) => id,
             },
-            RequestId::Router => unreachable!("All BBRange requests belong to sync"),
+            RequestId::Router => {
+                crit!(self.log, "All BBRange requests belong to sync"; "peer_id" => %peer_id);
+                return;
+            }
         };
 
         trace!(
@@ -548,10 +555,18 @@ impl<T: BeaconChainTypes> Router<T> {
                 | SyncId::RangeBlocks { .. }
                 | SyncId::RangeBlockAndBlobs { .. }
                 | SyncId::BackFillBlockAndBlobs { .. } => {
-                    unreachable!("Batch syncing do not request BBRoot requests")
+                    crit!(self.log, "Batch syncing do not request BBRoot requests"; "peer_id" => %peer_id);
+                    return;
+                }
+                SyncId::SingleBlob { .. } | SyncId::ParentLookupBlob { .. } => {
+                    crit!(self.log, "Blob response to block by roots request"; "peer_id" => %peer_id);
+                    return;
                 }
             },
-            RequestId::Router => unreachable!("All BBRoot requests belong to sync"),
+            RequestId::Router => {
+                crit!(self.log, "All BBRoot requests belong to sync"; "peer_id" => %peer_id);
+                return;
+            }
         };
 
         trace!(
@@ -576,15 +591,23 @@ impl<T: BeaconChainTypes> Router<T> {
     ) {
         let request_id = match request_id {
             RequestId::Sync(sync_id) => match sync_id {
-                id @ (SyncId::SingleBlock { .. } | SyncId::ParentLookup { .. }) => id,
+                id @ (SyncId::SingleBlob { .. } | SyncId::ParentLookupBlob { .. }) => id,
+                SyncId::SingleBlock { .. } | SyncId::ParentLookup { .. } => {
+                    crit!(self.log, "Block response to blobs by roots request"; "peer_id" => %peer_id);
+                    return;
+                }
                 SyncId::BackFillBlocks { .. }
                 | SyncId::RangeBlocks { .. }
                 | SyncId::RangeBlockAndBlobs { .. }
                 | SyncId::BackFillBlockAndBlobs { .. } => {
-                    unreachable!("Batch syncing does not request BBRoot requests")
+                    crit!(self.log, "Batch syncing does not request BBRoot requests"; "peer_id" => %peer_id);
+                    return;
                 }
             },
-            RequestId::Router => unreachable!("All BlobsByRoot requests belong to sync"),
+            RequestId::Router => {
+                crit!(self.log, "All BlobsByRoot requests belong to sync"; "peer_id" => %peer_id);
+                return;
+            }
         };
 
         trace!(

beacon_node/network/src/sync/block_lookups/common.rs

@@ -0,0 +1,473 @@
+use crate::sync::block_lookups::parent_lookup::PARENT_FAIL_TOLERANCE;
+use crate::sync::block_lookups::single_block_lookup::{
+    LookupRequestError, LookupVerifyError, SingleBlockLookup, SingleLookupRequestState, State,
+};
+use crate::sync::block_lookups::{
+    BlobRequestState, BlockLookups, BlockRequestState, PeerShouldHave,
+    SINGLE_BLOCK_LOOKUP_MAX_ATTEMPTS,
+};
+use crate::sync::manager::{BlockProcessType, Id, SingleLookupReqId};
+use crate::sync::network_context::SyncNetworkContext;
+use crate::sync::CachedChildComponents;
+use beacon_chain::block_verification_types::RpcBlock;
+use beacon_chain::{get_block_root, BeaconChainTypes};
+use lighthouse_network::rpc::methods::BlobsByRootRequest;
+use lighthouse_network::rpc::BlocksByRootRequest;
+use lighthouse_network::PeerId;
+use rand::prelude::IteratorRandom;
+use ssz_types::VariableList;
+use std::ops::IndexMut;
+use std::sync::Arc;
+use std::time::Duration;
+use types::blob_sidecar::FixedBlobSidecarList;
+use types::{BlobSidecar, EthSpec, Hash256, SignedBeaconBlock};
+
+#[derive(Debug, Copy, Clone)]
+pub enum ResponseType {
+    Block,
+    Blob,
+}
+
+#[derive(Debug, Copy, Clone)]
+pub enum LookupType {
+    Current,
+    Parent,
+}
+
+/// This trait helps differentiate `SingleBlockLookup`s from `ParentLookup`s .This is useful in
+/// ensuring requests and responses are handled separately and enables us to use different failure
+/// tolerances for each, while re-using the same basic request and retry logic.
+pub trait Lookup {
+    const MAX_ATTEMPTS: u8;
+    fn lookup_type() -> LookupType;
+    fn max_attempts() -> u8 {
+        Self::MAX_ATTEMPTS
+    }
+}
+
+/// A `Lookup` that is a part of a `ParentLookup`.
+pub struct Parent;
+
+impl Lookup for Parent {
+    const MAX_ATTEMPTS: u8 = PARENT_FAIL_TOLERANCE;
+    fn lookup_type() -> LookupType {
+        LookupType::Parent
+    }
+}
+
+/// A `Lookup` that part of a single block lookup.
+pub struct Current;
+
+impl Lookup for Current {
+    const MAX_ATTEMPTS: u8 = SINGLE_BLOCK_LOOKUP_MAX_ATTEMPTS;
+    fn lookup_type() -> LookupType {
+        LookupType::Current
+    }
+}
+
+/// This trait unifies common single block lookup functionality across blocks and blobs. This
+/// includes making requests, verifying responses, and handling processing results. A
+/// `SingleBlockLookup` includes both a `BlockRequestState` and a `BlobRequestState`, this trait is
+/// implemented for each.
+///
+/// The use of the `ResponseType` associated type gives us a degree of type
+/// safety when handling a block/blob response ensuring we only mutate the correct corresponding
+/// state.
+pub trait RequestState<L: Lookup, T: BeaconChainTypes> {
+    /// The type of the request .
+    type RequestType;
+
+    /// A block or blob response.
+    type ResponseType;
+
+    /// The type created after validation.
+    type VerifiedResponseType: Clone;
+
+    /// We convert a `VerifiedResponseType` to this type prior to sending it to the beacon processor.
+    type ReconstructedResponseType;
+
+    /* Request building methods */
+
+    /// Construct a new request.
+    fn build_request(&mut self) -> Result<(PeerShouldHave, Self::RequestType), LookupRequestError> {
+        // Verify and construct request.
+        self.too_many_attempts()?;
+        let peer = self.get_peer()?;
+        let request = self.new_request();
+        Ok((peer, request))
+    }
+
+    /// Construct a new request and send it.
+    fn build_request_and_send(
+        &mut self,
+        id: Id,
+        already_downloaded: bool,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError> {
+        // Check if request is necessary.
+        if already_downloaded || !matches!(self.get_state().state, State::AwaitingDownload) {
+            return Ok(());
+        }
+
+        // Construct request.
+        let (peer_id, request) = self.build_request()?;
+
+        // Update request state.
+        self.get_state_mut().state = State::Downloading { peer_id };
+        self.get_state_mut().req_counter += 1;
+
+        // Make request
+        let id = SingleLookupReqId {
+            id,
+            req_counter: self.get_state().req_counter,
+        };
+        Self::make_request(id, peer_id.to_peer_id(), request, cx)
+    }
+
+    /// Verify the current request has not exceeded the maximum number of attempts.
+    fn too_many_attempts(&self) -> Result<(), LookupRequestError> {
+        let max_attempts = L::max_attempts();
+        let request_state = self.get_state();
+
+        if request_state.failed_attempts() >= max_attempts {
+            let cannot_process =
+                request_state.failed_processing >= request_state.failed_downloading;
+            Err(LookupRequestError::TooManyAttempts { cannot_process })
+        } else {
+            Ok(())
+        }
+    }
+
+    /// Get the next peer to request. Draws from the set of peers we think should have both the
+    /// block and blob first. If that fails, we draw from the set of peers that may have either.
+    fn get_peer(&mut self) -> Result<PeerShouldHave, LookupRequestError> {
+        let request_state = self.get_state_mut();
+        let available_peer_opt = request_state
+            .available_peers
+            .iter()
+            .choose(&mut rand::thread_rng())
+            .copied()
+            .map(PeerShouldHave::BlockAndBlobs);
+
+        let Some(peer_id) = available_peer_opt.or_else(||request_state
+            .potential_peers
+            .iter()
+            .choose(&mut rand::thread_rng())
+            .copied()
+            .map(PeerShouldHave::Neither)) else {
+            return Err(LookupRequestError::NoPeers);
+        };
+        request_state.used_peers.insert(peer_id.to_peer_id());
+        Ok(peer_id)
+    }
+
+    /// Initialize `Self::RequestType`.
+    fn new_request(&self) -> Self::RequestType;
+
+    /// Send the request to the network service.
+    fn make_request(
+        id: SingleLookupReqId,
+        peer_id: PeerId,
+        request: Self::RequestType,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError>;
+
+    /* Response handling methods */
+
+    /// Verify the response is valid based on what we requested.
+    fn verify_response(
+        &mut self,
+        expected_block_root: Hash256,
+        response: Option<Self::ResponseType>,
+    ) -> Result<Option<Self::VerifiedResponseType>, LookupVerifyError> {
+        let request_state = self.get_state_mut();
+        match request_state.state {
+            State::AwaitingDownload => {
+                request_state.register_failure_downloading();
+                Err(LookupVerifyError::ExtraBlocksReturned)
+            }
+            State::Downloading { peer_id } => {
+                self.verify_response_inner(expected_block_root, response, peer_id)
+            }
+            State::Processing { peer_id: _ } => match response {
+                Some(_) => {
+                    // We sent the block for processing and received an extra block.
+                    request_state.register_failure_downloading();
+                    Err(LookupVerifyError::ExtraBlocksReturned)
+                }
+                None => {
+                    // This is simply the stream termination and we are already processing the
+                    // block
+                    Ok(None)
+                }
+            },
+        }
+    }
+
+    /// The response verification unique to block or blobs.
+    fn verify_response_inner(
+        &mut self,
+        expected_block_root: Hash256,
+        response: Option<Self::ResponseType>,
+        peer_id: PeerShouldHave,
+    ) -> Result<Option<Self::VerifiedResponseType>, LookupVerifyError>;
+
+    /// A getter for the parent root of the response. Returns an `Option` because we won't know
+    /// the blob parent if we don't end up getting any blobs in the response.
+    fn get_parent_root(verified_response: &Self::VerifiedResponseType) -> Option<Hash256>;
+
+    /// Caches the verified response in the lookup if necessary. This is only necessary for lookups
+    /// triggered by `UnknownParent` errors.
+    fn add_to_child_components(
+        verified_response: Self::VerifiedResponseType,
+        components: &mut CachedChildComponents<T::EthSpec>,
+    );
+
+    /// Convert a verified response to the type we send to the beacon processor.
+    fn verified_to_reconstructed(
+        verified: Self::VerifiedResponseType,
+    ) -> Self::ReconstructedResponseType;
+
+    /// Send the response to the beacon processor.
+    fn send_reconstructed_for_processing(
+        id: Id,
+        bl: &BlockLookups<T>,
+        block_root: Hash256,
+        verified: Self::ReconstructedResponseType,
+        duration: Duration,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError>;
+
+    /// Remove the peer from the lookup if it is useless.
+    fn remove_if_useless(&mut self, peer: &PeerId) {
+        self.get_state_mut().remove_peer_if_useless(peer)
+    }
+
+    /// Register a failure to process the block or blob.
+    fn register_failure_downloading(&mut self) {
+        self.get_state_mut().register_failure_downloading()
+    }
+
+    /* Utility methods */
+
+    /// Returns the `ResponseType` associated with this trait implementation. Useful in logging.
+    fn response_type() -> ResponseType;
+
+    /// A getter for the `BlockRequestState` or `BlobRequestState` associated with this trait.
+    fn request_state_mut(request: &mut SingleBlockLookup<L, T>) -> &mut Self;
+
+    /// A getter for a reference to the `SingleLookupRequestState` associated with this trait.
+    fn get_state(&self) -> &SingleLookupRequestState;
+
+    /// A getter for a mutable reference to the SingleLookupRequestState associated with this trait.
+    fn get_state_mut(&mut self) -> &mut SingleLookupRequestState;
+}
+
+impl<L: Lookup, T: BeaconChainTypes> RequestState<L, T> for BlockRequestState<L> {
+    type RequestType = BlocksByRootRequest;
+    type ResponseType = Arc<SignedBeaconBlock<T::EthSpec>>;
+    type VerifiedResponseType = Arc<SignedBeaconBlock<T::EthSpec>>;
+    type ReconstructedResponseType = RpcBlock<T::EthSpec>;
+
+    fn new_request(&self) -> BlocksByRootRequest {
+        BlocksByRootRequest::new(VariableList::from(vec![self.requested_block_root]))
+    }
+
+    fn make_request(
+        id: SingleLookupReqId,
+        peer_id: PeerId,
+        request: Self::RequestType,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError> {
+        cx.block_lookup_request(id, peer_id, request, L::lookup_type())
+            .map_err(LookupRequestError::SendFailed)
+    }
+
+    fn verify_response_inner(
+        &mut self,
+        expected_block_root: Hash256,
+        response: Option<Self::ResponseType>,
+        peer_id: PeerShouldHave,
+    ) -> Result<Option<Arc<SignedBeaconBlock<T::EthSpec>>>, LookupVerifyError> {
+        match response {
+            Some(block) => {
+                // Compute the block root using this specific function so that we can get timing
+                // metrics.
+                let block_root = get_block_root(&block);
+                if block_root != expected_block_root {
+                    // return an error and drop the block
+                    // NOTE: we take this is as a download failure to prevent counting the
+                    // attempt as a chain failure, but simply a peer failure.
+                    self.state.register_failure_downloading();
+                    Err(LookupVerifyError::RootMismatch)
+                } else {
+                    // Return the block for processing.
+                    self.state.state = State::Processing { peer_id };
+                    Ok(Some(block))
+                }
+            }
+            None => {
+                if peer_id.should_have_block() {
+                    self.state.register_failure_downloading();
+                    Err(LookupVerifyError::NoBlockReturned)
+                } else {
+                    self.state.state = State::AwaitingDownload;
+                    Err(LookupVerifyError::BenignFailure)
+                }
+            }
+        }
+    }
+
+    fn get_parent_root(verified_response: &Arc<SignedBeaconBlock<T::EthSpec>>) -> Option<Hash256> {
+        Some(verified_response.parent_root())
+    }
+
+    fn add_to_child_components(
+        verified_response: Arc<SignedBeaconBlock<T::EthSpec>>,
+        components: &mut CachedChildComponents<T::EthSpec>,
+    ) {
+        components.add_cached_child_block(verified_response);
+    }
+
+    fn verified_to_reconstructed(
+        block: Arc<SignedBeaconBlock<T::EthSpec>>,
+    ) -> RpcBlock<T::EthSpec> {
+        RpcBlock::new_without_blobs(block)
+    }
+
+    fn send_reconstructed_for_processing(
+        id: Id,
+        bl: &BlockLookups<T>,
+        block_root: Hash256,
+        constructed: RpcBlock<T::EthSpec>,
+        duration: Duration,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError> {
+        bl.send_block_for_processing(
+            block_root,
+            constructed,
+            duration,
+            BlockProcessType::SingleBlock { id },
+            cx,
+        )
+    }
+
+    fn response_type() -> ResponseType {
+        ResponseType::Block
+    }
+    fn request_state_mut(request: &mut SingleBlockLookup<L, T>) -> &mut Self {
+        &mut request.block_request_state
+    }
+    fn get_state(&self) -> &SingleLookupRequestState {
+        &self.state
+    }
+    fn get_state_mut(&mut self) -> &mut SingleLookupRequestState {
+        &mut self.state
+    }
+}
+
+impl<L: Lookup, T: BeaconChainTypes> RequestState<L, T> for BlobRequestState<L, T::EthSpec> {
+    type RequestType = BlobsByRootRequest;
+    type ResponseType = Arc<BlobSidecar<T::EthSpec>>;
+    type VerifiedResponseType = FixedBlobSidecarList<T::EthSpec>;
+    type ReconstructedResponseType = FixedBlobSidecarList<T::EthSpec>;
+
+    fn new_request(&self) -> BlobsByRootRequest {
+        BlobsByRootRequest {
+            blob_ids: VariableList::from(self.requested_ids.clone()),
+        }
+    }
+
+    fn make_request(
+        id: SingleLookupReqId,
+        peer_id: PeerId,
+        request: Self::RequestType,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError> {
+        cx.blob_lookup_request(id, peer_id, request, L::lookup_type())
+            .map_err(LookupRequestError::SendFailed)
+    }
+
+    fn verify_response_inner(
+        &mut self,
+        _expected_block_root: Hash256,
+        blob: Option<Self::ResponseType>,
+        peer_id: PeerShouldHave,
+    ) -> Result<Option<FixedBlobSidecarList<T::EthSpec>>, LookupVerifyError> {
+        match blob {
+            Some(blob) => {
+                let received_id = blob.id();
+                if !self.requested_ids.contains(&received_id) {
+                    self.state.register_failure_downloading();
+                    Err(LookupVerifyError::UnrequestedBlobId)
+                } else {
+                    // State should remain downloading until we receive the stream terminator.
+                    self.requested_ids.retain(|id| *id != received_id);
+                    let blob_index = blob.index;
+
+                    if blob_index >= T::EthSpec::max_blobs_per_block() as u64 {
+                        return Err(LookupVerifyError::InvalidIndex(blob.index));
+                    }
+                    *self.blob_download_queue.index_mut(blob_index as usize) = Some(blob);
+                    Ok(None)
+                }
+            }
+            None => {
+                self.state.state = State::Processing { peer_id };
+                let blobs = std::mem::take(&mut self.blob_download_queue);
+                Ok(Some(blobs))
+            }
+        }
+    }
+
+    fn get_parent_root(verified_response: &FixedBlobSidecarList<T::EthSpec>) -> Option<Hash256> {
+        verified_response
+            .into_iter()
+            .filter_map(|blob| blob.as_ref())
+            .map(|blob| blob.block_parent_root)
+            .next()
+    }
+
+    fn add_to_child_components(
+        verified_response: FixedBlobSidecarList<T::EthSpec>,
+        components: &mut CachedChildComponents<T::EthSpec>,
+    ) {
+        components.add_cached_child_blobs(verified_response);
+    }
+
+    fn verified_to_reconstructed(
+        blobs: FixedBlobSidecarList<T::EthSpec>,
+    ) -> FixedBlobSidecarList<T::EthSpec> {
+        blobs
+    }
+
+    fn send_reconstructed_for_processing(
+        id: Id,
+        bl: &BlockLookups<T>,
+        block_root: Hash256,
+        verified: FixedBlobSidecarList<T::EthSpec>,
+        duration: Duration,
+        cx: &SyncNetworkContext<T>,
+    ) -> Result<(), LookupRequestError> {
+        bl.send_blobs_for_processing(
+            block_root,
+            verified,
+            duration,
+            BlockProcessType::SingleBlob { id },
+            cx,
+        )
+    }
+
+    fn response_type() -> ResponseType {
+        ResponseType::Blob
+    }
+    fn request_state_mut(request: &mut SingleBlockLookup<L, T>) -> &mut Self {
+        &mut request.blob_request_state
+    }
+    fn get_state(&self) -> &SingleLookupRequestState {
+        &self.state
+    }
+    fn get_state_mut(&mut self) -> &mut SingleLookupRequestState {
+        &mut self.state
+    }
+}

beacon_node/network/src/sync/block_lookups/parent_lookup.rs

@@ -1,18 +1,17 @@
 use super::single_block_lookup::{LookupRequestError, LookupVerifyError, SingleBlockLookup};
-use super::{BlobRequestId, BlockRequestId, DownloadedBlocks, PeerShouldHave, ResponseType};
+use super::{DownloadedBlock, PeerShouldHave};
-use crate::sync::block_lookups::single_block_lookup::{State, UnknownParentComponents};
+use crate::sync::block_lookups::common::Parent;
-use crate::sync::block_lookups::{RootBlobsTuple, RootBlockTuple};
+use crate::sync::block_lookups::common::RequestState;
 use crate::sync::{manager::SLOT_IMPORT_TOLERANCE, network_context::SyncNetworkContext};
 use beacon_chain::block_verification_types::AsBlock;
 use beacon_chain::block_verification_types::RpcBlock;
 use beacon_chain::data_availability_checker::DataAvailabilityChecker;
 use beacon_chain::BeaconChainTypes;
+use itertools::Itertools;
 use lighthouse_network::PeerId;
 use std::sync::Arc;
 use store::Hash256;
 use strum::IntoStaticStr;
-use types::blob_sidecar::FixedBlobSidecarList;
-use types::{BlobSidecar, SignedBeaconBlock};
 
 /// How many attempts we try to find a parent of a block before we give up trying.
 pub(crate) const PARENT_FAIL_TOLERANCE: u8 = 5;
@@ -26,9 +25,9 @@ pub(crate) struct ParentLookup<T: BeaconChainTypes> {
     /// The root of the block triggering this parent request.
     chain_hash: Hash256,
     /// The blocks that have currently been downloaded.
-    downloaded_blocks: Vec<DownloadedBlocks<T::EthSpec>>,
+    downloaded_blocks: Vec<DownloadedBlock<T::EthSpec>>,
     /// Request of the last parent.
-    pub current_parent_request: SingleBlockLookup<PARENT_FAIL_TOLERANCE, T>,
+    pub current_parent_request: SingleBlockLookup<Parent, T>,
 }
 
 #[derive(Debug, PartialEq, Eq, IntoStaticStr)]
@@ -63,9 +62,15 @@ impl<T: BeaconChainTypes> ParentLookup<T> {
         parent_root: Hash256,
         peer_id: PeerShouldHave,
         da_checker: Arc<DataAvailabilityChecker<T>>,
+        cx: &mut SyncNetworkContext<T>,
     ) -> Self {
-        let current_parent_request =
+        let current_parent_request = SingleBlockLookup::new(
-            SingleBlockLookup::new(parent_root, Some(<_>::default()), &[peer_id], da_checker);
+            parent_root,
+            Some(<_>::default()),
+            &[peer_id],
+            da_checker,
+            cx.next_id(),
+        );
 
         Self {
             chain_hash: block_root,
@@ -85,116 +90,53 @@ impl<T: BeaconChainTypes> ParentLookup<T> {
     }
 
     /// Attempts to request the next unknown parent. If the request fails, it should be removed.
-    pub fn request_parent_block(
+    pub fn request_parent(&mut self, cx: &SyncNetworkContext<T>) -> Result<(), RequestError> {
-        &mut self,
-        cx: &mut SyncNetworkContext<T>,
-    ) -> Result<(), RequestError> {
         // check to make sure this request hasn't failed
         if self.downloaded_blocks.len() + 1 >= PARENT_DEPTH_TOLERANCE {
             return Err(RequestError::ChainTooLong);
         }
 
-        if let Some((peer_id, request)) = self.current_parent_request.request_block()? {
+        self.current_parent_request
-            match cx.parent_lookup_block_request(peer_id, request) {
+            .request_block_and_blobs(cx)
-                Ok(request_id) => {
+            .map_err(Into::into)
-                    self.current_parent_request.id.block_request_id = Some(request_id);
-                    return Ok(());
-                }
-                Err(reason) => {
-                    self.current_parent_request.id.block_request_id = None;
-                    return Err(RequestError::SendFailed(reason));
-                }
-            }
-        }
-        Ok(())
     }
 
-    pub fn request_parent_blobs(
+    pub fn check_peer_disconnected(&mut self, peer_id: &PeerId) -> Result<(), ()> {
-        &mut self,
-        cx: &mut SyncNetworkContext<T>,
-    ) -> Result<(), RequestError> {
-        // check to make sure this request hasn't failed
-        if self.downloaded_blocks.len() + 1 >= PARENT_DEPTH_TOLERANCE {
-            return Err(RequestError::ChainTooLong);
-        }
-
-        if let Some((peer_id, request)) = self.current_parent_request.request_blobs()? {
-            match cx.parent_lookup_blobs_request(peer_id, request) {
-                Ok(request_id) => {
-                    self.current_parent_request.id.blob_request_id = Some(request_id);
-                    return Ok(());
-                }
-                Err(reason) => {
-                    self.current_parent_request.id.blob_request_id = None;
-                    return Err(RequestError::SendFailed(reason));
-                }
-            }
-        }
-        Ok(())
-    }
-
-    pub fn check_block_peer_disconnected(&mut self, peer_id: &PeerId) -> Result<(), ()> {
         self.current_parent_request
             .block_request_state
             .state
             .check_peer_disconnected(peer_id)
-    }
+            .and_then(|()| {
-
+                self.current_parent_request
-    pub fn check_blob_peer_disconnected(&mut self, peer_id: &PeerId) -> Result<(), ()> {
+                    .blob_request_state
-        self.current_parent_request
+                    .state
-            .blob_request_state
+                    .check_peer_disconnected(peer_id)
-            .state
+            })
-            .check_peer_disconnected(peer_id)
     }
 
     pub fn add_unknown_parent_block(&mut self, block: RpcBlock<T::EthSpec>) {
         let next_parent = block.parent_root();
-
         // Cache the block.
-        let current_root = self
+        let current_root = self.current_parent_request.block_root();
-            .current_parent_request
-            .block_request_state
-            .requested_block_root;
         self.downloaded_blocks.push((current_root, block));
 
-        // Update the block request.
+        // Update the parent request.
+        self.current_parent_request
+            .update_requested_parent_block(next_parent)
+    }
+
+    pub fn block_processing_peer(&self) -> Result<PeerShouldHave, ()> {
         self.current_parent_request
             .block_request_state
-            .requested_block_root = next_parent;
+            .state
-        self.current_parent_request.block_request_state.state.state = State::AwaitingDownload;
+            .processing_peer()
-        self.current_parent_request.id.block_request_id = None;
-
-        // Update the blobs request.
-        self.current_parent_request.blob_request_state.state.state = State::AwaitingDownload;
-        self.current_parent_request.id.blob_request_id = None;
-
-        // Reset the unknown parent components.
-        self.current_parent_request.unknown_parent_components =
-            Some(UnknownParentComponents::default());
     }
 
-    pub fn add_current_request_block(&mut self, block: Arc<SignedBeaconBlock<T::EthSpec>>) {
+    pub fn blob_processing_peer(&self) -> Result<PeerShouldHave, ()> {
-        // Cache the block.
+        self.current_parent_request
-        self.current_parent_request.add_unknown_parent_block(block);
+            .blob_request_state
-
+            .state
-        // Update the request.
+            .processing_peer()
-        self.current_parent_request.id.block_request_id = None;
-    }
-
-    pub fn add_current_request_blobs(&mut self, blobs: FixedBlobSidecarList<T::EthSpec>) {
-        // Cache the blobs.
-        self.current_parent_request.add_unknown_parent_blobs(blobs);
-
-        // Update the request.
-        self.current_parent_request.id.blob_request_id = None;
-    }
-
-    pub fn pending_block_response(&self, req_id: BlockRequestId) -> bool {
-        self.current_parent_request.id.block_request_id == Some(req_id)
-    }
-
-    pub fn pending_blob_response(&self, req_id: BlobRequestId) -> bool {
-        self.current_parent_request.id.blob_request_id == Some(req_id)
     }
 
     /// Consumes the parent request and destructures it into it's parts.
@@ -205,7 +147,7 @@ impl<T: BeaconChainTypes> ParentLookup<T> {
         Hash256,
         Vec<RpcBlock<T::EthSpec>>,
         Vec<Hash256>,
-        SingleBlockLookup<PARENT_FAIL_TOLERANCE, T>,
+        SingleBlockLookup<Parent, T>,
     ) {
         let ParentLookup {
             chain_hash,
@@ -227,73 +169,40 @@ impl<T: BeaconChainTypes> ParentLookup<T> {
         self.chain_hash
     }
 
-    pub fn block_download_failed(&mut self) {
+    pub fn processing_failed(&mut self) {
-        self.current_parent_request
-            .block_request_state
-            .state
-            .register_failure_downloading();
-        self.current_parent_request.id.block_request_id = None;
-    }
-
-    pub fn blob_download_failed(&mut self) {
-        self.current_parent_request
-            .blob_request_state
-            .state
-            .register_failure_downloading();
-        self.current_parent_request.id.blob_request_id = None;
-    }
-
-    pub fn block_processing_failed(&mut self) {
         self.current_parent_request
             .block_request_state
             .state
             .register_failure_processing();
-        if let Some(components) = self
+        self.current_parent_request
-            .current_parent_request
+            .blob_request_state
-            .unknown_parent_components
+            .state
-            .as_mut()
+            .register_failure_processing();
-        {
+        if let Some(components) = self.current_parent_request.cached_child_components.as_mut() {
             components.downloaded_block = None;
-        }
-        self.current_parent_request.id.block_request_id = None;
-    }
-
-    pub fn blob_processing_failed(&mut self) {
-        self.current_parent_request
-            .blob_request_state
-            .state
-            .register_failure_processing();
-        if let Some(components) = self
-            .current_parent_request
-            .unknown_parent_components
-            .as_mut()
-        {
             components.downloaded_blobs = <_>::default();
         }
-        self.current_parent_request.id.blob_request_id = None;
     }
 
     /// Verifies that the received block is what we requested. If so, parent lookup now waits for
     /// the processing result of the block.
-    pub fn verify_block(
+    pub fn verify_response<R: RequestState<Parent, T>>(
         &mut self,
-        block: Option<Arc<SignedBeaconBlock<T::EthSpec>>>,
+        block: Option<R::ResponseType>,
         failed_chains: &mut lru_cache::LRUTimeCache<Hash256>,
-    ) -> Result<Option<RootBlockTuple<T::EthSpec>>, ParentVerifyError> {
+    ) -> Result<Option<R::VerifiedResponseType>, ParentVerifyError> {
-        let root_and_block = self.current_parent_request.verify_block(block)?;
+        let expected_block_root = self.current_parent_request.block_root();
+        let request_state = R::request_state_mut(&mut self.current_parent_request);
+        let root_and_block = request_state.verify_response(expected_block_root, block)?;
 
         // check if the parent of this block isn't in the failed cache. If it is, this chain should
         // be dropped and the peer downscored.
         if let Some(parent_root) = root_and_block
             .as_ref()
-            .map(|(_, block)| block.parent_root())
+            .and_then(|block| R::get_parent_root(block))
         {
             if failed_chains.contains(&parent_root) {
-                self.current_parent_request
+                request_state.register_failure_downloading();
-                    .block_request_state
-                    .state
-                    .register_failure_downloading();
-                self.current_parent_request.id.block_request_id = None;
                 return Err(ParentVerifyError::PreviousFailure { parent_root });
             }
         }
@@ -301,49 +210,24 @@ impl<T: BeaconChainTypes> ParentLookup<T> {
         Ok(root_and_block)
     }
 
-    pub fn verify_blob(
-        &mut self,
-        blob: Option<Arc<BlobSidecar<T::EthSpec>>>,
-        failed_chains: &mut lru_cache::LRUTimeCache<Hash256>,
-    ) -> Result<Option<RootBlobsTuple<T::EthSpec>>, ParentVerifyError> {
-        let parent_root_opt = blob.as_ref().map(|b| b.block_parent_root);
-        let blobs = self.current_parent_request.verify_blob(blob)?;
-
-        // check if the parent of this block isn't in the failed cache. If it is, this chain should
-        // be dropped and the peer downscored.
-        if let Some(parent_root) = parent_root_opt {
-            if failed_chains.contains(&parent_root) {
-                self.current_parent_request
-                    .blob_request_state
-                    .state
-                    .register_failure_downloading();
-                self.current_parent_request.id.blob_request_id = None;
-                return Err(ParentVerifyError::PreviousFailure { parent_root });
-            }
-        }
-
-        Ok(blobs)
-    }
-
     pub fn add_peers(&mut self, peer_source: &[PeerShouldHave]) {
         self.current_parent_request.add_peers(peer_source)
     }
 
-    pub fn used_peers(&self, response_type: ResponseType) -> impl Iterator<Item = &PeerId> + '_ {
+    pub fn used_peers(&self) -> impl Iterator<Item = &PeerId> + '_ {
-        match response_type {
+        self.current_parent_request
-            ResponseType::Block => self
+            .block_request_state
-                .current_parent_request
+            .state
-                .block_request_state
+            .used_peers
-                .state
+            .iter()
-                .used_peers
+            .chain(
-                .iter(),
+                self.current_parent_request
-            ResponseType::Blob => self
+                    .blob_request_state
-                .current_parent_request
+                    .state
-                .blob_request_state
+                    .used_peers
-                .state
+                    .iter(),
-                .used_peers
+            )
-                .iter(),
+            .unique()
-        }
     }
 }
 
@@ -371,6 +255,7 @@ impl From<LookupRequestError> for RequestError {
                 RequestError::TooManyAttempts { cannot_process }
             }
             E::NoPeers => RequestError::NoPeers,
+            E::SendFailed(msg) => RequestError::SendFailed(msg),
         }
     }
 }

beacon_node/network/src/sync/block_lookups/tests.rs

@@ -1,12 +1,13 @@
 use crate::network_beacon_processor::NetworkBeaconProcessor;
 
 use crate::service::RequestId;
-use crate::sync::manager::RequestId as SyncId;
+use crate::sync::manager::{RequestId as SyncId, SingleLookupReqId};
 use crate::NetworkMessage;
 use std::sync::Arc;
 
 use super::*;
 
+use crate::sync::block_lookups::common::ResponseType;
 use beacon_chain::builder::Witness;
 use beacon_chain::eth1_chain::CachingEth1Backend;
 use beacon_chain::test_utils::{build_log, BeaconChainHarness, EphemeralHarnessType};
@@ -20,7 +21,8 @@ use tokio::sync::mpsc;
 use types::{
     map_fork_name, map_fork_name_with,
     test_utils::{SeedableRng, TestRandom, XorShiftRng},
-    BeaconBlock, EthSpec, ForkName, FullPayloadDeneb, MinimalEthSpec as E, SignedBeaconBlock,
+    BeaconBlock, BlobSidecar, EthSpec, ForkName, FullPayloadDeneb, MinimalEthSpec as E,
+    SignedBeaconBlock,
 };
 
 type T = Witness<ManualSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
@@ -155,7 +157,7 @@ impl TestRig {
     }
 
     #[track_caller]
-    fn expect_block_request(&mut self, response_type: ResponseType) -> Id {
+    fn expect_lookup_request(&mut self, response_type: ResponseType) -> SingleLookupReqId {
         match response_type {
             ResponseType::Block => match self.network_rx.try_recv() {
                 Ok(NetworkMessage::SendRequest {
@@ -171,7 +173,7 @@ impl TestRig {
                 Ok(NetworkMessage::SendRequest {
                     peer_id: _,
                     request: Request::BlobsByRoot(_request),
-                    request_id: RequestId::Sync(SyncId::SingleBlock { id }),
+                    request_id: RequestId::Sync(SyncId::SingleBlob { id }),
                 }) => id,
                 other => {
                     panic!("Expected blob request, found {:?}", other);
@@ -181,7 +183,7 @@ impl TestRig {
     }
 
     #[track_caller]
-    fn expect_parent_request(&mut self, response_type: ResponseType) -> Id {
+    fn expect_parent_request(&mut self, response_type: ResponseType) -> SingleLookupReqId {
         match response_type {
             ResponseType::Block => match self.network_rx.try_recv() {
                 Ok(NetworkMessage::SendRequest {
@@ -195,7 +197,7 @@ impl TestRig {
                 Ok(NetworkMessage::SendRequest {
                     peer_id: _,
                     request: Request::BlobsByRoot(_request),
-                    request_id: RequestId::Sync(SyncId::ParentLookup { id }),
+                    request_id: RequestId::Sync(SyncId::ParentLookupBlob { id }),
                 }) => id,
                 other => panic!("Expected parent blobs request, found {:?}", other),
             },
@@ -295,16 +297,22 @@ fn test_single_block_lookup_happy_path() {
     let block_root = block.canonical_root();
     // Trigger the request
     bl.search_block(block_root, PeerShouldHave::BlockAndBlobs(peer_id), &mut cx);
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // The peer provides the correct block, should not be penalized. Now the block should be sent
     // for processing.
-    bl.single_block_lookup_response(id, peer_id, Some(block.into()), D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(
+        id,
+        peer_id,
+        Some(block.into()),
+        D,
+        &cx,
+    );
     rig.expect_empty_network();
     rig.expect_block_process(response_type);
 
@@ -313,11 +321,10 @@ fn test_single_block_lookup_happy_path() {
 
     // Send the stream termination. Peer should have not been penalized, and the request removed
     // after processing.
-    bl.single_block_lookup_response(id, peer_id, None, D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(id, peer_id, None, D, &cx);
-    bl.single_block_component_processed(
+    bl.single_block_component_processed::<BlockRequestState<Current>>(
-        id,
+        id.id,
         BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(block_root)),
-        response_type,
         &mut cx,
     );
     rig.expect_empty_network();
@@ -338,18 +345,18 @@ fn test_single_block_lookup_empty_response() {
 
     // Trigger the request
     bl.search_block(block_hash, PeerShouldHave::BlockAndBlobs(peer_id), &mut cx);
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // The peer does not have the block. It should be penalized.
-    bl.single_block_lookup_response(id, peer_id, None, D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(id, peer_id, None, D, &cx);
     rig.expect_penalty();
 
-    rig.expect_block_request(response_type); // it should be retried
+    rig.expect_lookup_request(response_type); // it should be retried
 }
 
 #[test]
@@ -366,21 +373,27 @@ fn test_single_block_lookup_wrong_response() {
 
     // Trigger the request
     bl.search_block(block_hash, PeerShouldHave::BlockAndBlobs(peer_id), &mut cx);
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // Peer sends something else. It should be penalized.
     let bad_block = rig.rand_block(fork_name);
-    bl.single_block_lookup_response(id, peer_id, Some(bad_block.into()), D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(
+        id,
+        peer_id,
+        Some(bad_block.into()),
+        D,
+        &cx,
+    );
     rig.expect_penalty();
-    rig.expect_block_request(response_type); // should be retried
+    rig.expect_lookup_request(response_type); // should be retried
 
     // Send the stream termination. This should not produce an additional penalty.
-    bl.single_block_lookup_response(id, peer_id, None, D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(id, peer_id, None, D, &cx);
     rig.expect_empty_network();
 }
 
@@ -398,16 +411,21 @@ fn test_single_block_lookup_failure() {
 
     // Trigger the request
     bl.search_block(block_hash, PeerShouldHave::BlockAndBlobs(peer_id), &mut cx);
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // The request fails. RPC failures are handled elsewhere so we should not penalize the peer.
-    bl.single_block_lookup_failed(id, &peer_id, &mut cx, RPCError::UnsupportedProtocol);
+    bl.single_block_lookup_failed::<BlockRequestState<Current>>(
-    rig.expect_block_request(response_type);
+        id,
+        &peer_id,
+        &cx,
+        RPCError::UnsupportedProtocol,
+    );
+    rig.expect_lookup_request(response_type);
     rig.expect_empty_network();
 }
 
@@ -429,16 +447,22 @@ fn test_single_block_lookup_becomes_parent_request() {
         PeerShouldHave::BlockAndBlobs(peer_id),
         &mut cx,
     );
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // The peer provides the correct block, should not be penalized. Now the block should be sent
     // for processing.
-    bl.single_block_lookup_response(id, peer_id, Some(block.clone()), D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(
+        id,
+        peer_id,
+        Some(block.clone()),
+        D,
+        &cx,
+    );
     rig.expect_empty_network();
     rig.expect_block_process(response_type);
 
@@ -447,10 +471,9 @@ fn test_single_block_lookup_becomes_parent_request() {
 
     // Send the stream termination. Peer should have not been penalized, and the request moved to a
     // parent request after processing.
-    bl.single_block_component_processed(
+    bl.single_block_component_processed::<BlockRequestState<Current>>(
-        id,
+        id.id,
         BlockError::ParentUnknown(block.into()).into(),
-        response_type,
         &mut cx,
     );
     assert_eq!(bl.single_block_lookups.len(), 1);
@@ -491,22 +514,23 @@ fn test_parent_lookup_happy_path() {
     }
 
     // Peer sends the right block, it should be sent for processing. Peer should not be penalized.
-    bl.parent_lookup_response(id, peer_id, Some(parent.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id,
+        peer_id,
+        Some(parent.into()),
+        D,
+        &cx,
+    );
     rig.expect_block_process(response_type);
     rig.expect_empty_network();
 
     // Processing succeeds, now the rest of the chain should be sent for processing.
-    bl.parent_block_processed(
+    bl.parent_block_processed(chain_hash, BlockError::BlockIsAlreadyKnown.into(), &mut cx);
-        chain_hash,
-        BlockError::BlockIsAlreadyKnown.into(),
-        response_type,
-        &mut cx,
-    );
     rig.expect_parent_chain_process();
     let process_result = BatchProcessResult::Success {
         was_non_empty: true,
     };
-    bl.parent_chain_processed(chain_hash, process_result, &mut cx);
+    bl.parent_chain_processed(chain_hash, process_result, &cx);
     assert_eq!(bl.parent_lookups.len(), 0);
 }
 
@@ -538,30 +562,41 @@ fn test_parent_lookup_wrong_response() {
 
     // Peer sends the wrong block, peer should be penalized and the block re-requested.
     let bad_block = rig.rand_block(fork_name);
-    bl.parent_lookup_response(id1, peer_id, Some(bad_block.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id1,
+        peer_id,
+        Some(bad_block.into()),
+        D,
+        &cx,
+    );
     rig.expect_penalty();
     let id2 = rig.expect_parent_request(response_type);
 
     // Send the stream termination for the first request. This should not produce extra penalties.
-    bl.parent_lookup_response(id1, peer_id, None, D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(id1, peer_id, None, D, &cx);
     rig.expect_empty_network();
 
     // Send the right block this time.
-    bl.parent_lookup_response(id2, peer_id, Some(parent.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id2,
+        peer_id,
+        Some(parent.into()),
+        D,
+        &cx,
+    );
     rig.expect_block_process(response_type);
 
     // Processing succeeds, now the rest of the chain should be sent for processing.
     bl.parent_block_processed(
         chain_hash,
         BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(block_root)),
-        response_type,
         &mut cx,
     );
     rig.expect_parent_chain_process();
     let process_result = BatchProcessResult::Success {
         was_non_empty: true,
     };
-    bl.parent_chain_processed(chain_hash, process_result, &mut cx);
+    bl.parent_chain_processed(chain_hash, process_result, &cx);
     assert_eq!(bl.parent_lookups.len(), 0);
 }
 
@@ -592,26 +627,31 @@ fn test_parent_lookup_empty_response() {
     }
 
     // Peer sends an empty response, peer should be penalized and the block re-requested.
-    bl.parent_lookup_response(id1, peer_id, None, D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(id1, peer_id, None, D, &cx);
     rig.expect_penalty();
     let id2 = rig.expect_parent_request(response_type);
 
     // Send the right block this time.
-    bl.parent_lookup_response(id2, peer_id, Some(parent.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id2,
+        peer_id,
+        Some(parent.into()),
+        D,
+        &cx,
+    );
     rig.expect_block_process(response_type);
 
     // Processing succeeds, now the rest of the chain should be sent for processing.
     bl.parent_block_processed(
         chain_hash,
         BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(block_root)),
-        response_type,
         &mut cx,
     );
     rig.expect_parent_chain_process();
     let process_result = BatchProcessResult::Success {
         was_non_empty: true,
     };
-    bl.parent_chain_processed(chain_hash, process_result, &mut cx);
+    bl.parent_chain_processed(chain_hash, process_result, &cx);
     assert_eq!(bl.parent_lookups.len(), 0);
 }
 
@@ -642,10 +682,10 @@ fn test_parent_lookup_rpc_failure() {
     }
 
     // The request fails. It should be tried again.
-    bl.parent_lookup_failed(
+    bl.parent_lookup_failed::<BlockRequestState<Parent>>(
         id1,
         peer_id,
-        &mut cx,
+        &cx,
         RPCError::ErrorResponse(
             RPCResponseErrorCode::ResourceUnavailable,
             "older than deneb".into(),
@@ -654,21 +694,26 @@ fn test_parent_lookup_rpc_failure() {
     let id2 = rig.expect_parent_request(response_type);
 
     // Send the right block this time.
-    bl.parent_lookup_response(id2, peer_id, Some(parent.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id2,
+        peer_id,
+        Some(parent.into()),
+        D,
+        &cx,
+    );
     rig.expect_block_process(response_type);
 
     // Processing succeeds, now the rest of the chain should be sent for processing.
     bl.parent_block_processed(
         chain_hash,
         BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(block_root)),
-        response_type,
         &mut cx,
     );
     rig.expect_parent_chain_process();
     let process_result = BatchProcessResult::Success {
         was_non_empty: true,
     };
-    bl.parent_chain_processed(chain_hash, process_result, &mut cx);
+    bl.parent_chain_processed(chain_hash, process_result, &cx);
     assert_eq!(bl.parent_lookups.len(), 0);
 }
 
@@ -701,10 +746,10 @@ fn test_parent_lookup_too_many_attempts() {
             // make sure every error is accounted for
             0 => {
                 // The request fails. It should be tried again.
-                bl.parent_lookup_failed(
+                bl.parent_lookup_failed::<BlockRequestState<Parent>>(
                     id,
                     peer_id,
-                    &mut cx,
+                    &cx,
                     RPCError::ErrorResponse(
                         RPCResponseErrorCode::ResourceUnavailable,
                         "older than deneb".into(),
@@ -714,9 +759,23 @@ fn test_parent_lookup_too_many_attempts() {
             _ => {
                 // Send a bad block this time. It should be tried again.
                 let bad_block = rig.rand_block(fork_name);
-                bl.parent_lookup_response(id, peer_id, Some(bad_block.into()), D, &mut cx);
+                bl.parent_lookup_response::<BlockRequestState<Parent>>(
+                    id,
+                    peer_id,
+                    Some(bad_block.into()),
+                    D,
+                    &cx,
+                );
                 // Send the stream termination
-                bl.parent_lookup_response(id, peer_id, None, D, &mut cx);
+
+                // Note, previously we would send the same lookup id with a stream terminator,
+                // we'd ignore it because we'd intrepret it as an unrequested response, since
+                // we already got one response for the block. I'm not sure what the intent is
+                // for having this stream terminator line in this test at all. Receiving an invalid
+                // block and a stream terminator with the same Id now results in two failed attempts,
+                // I'm unsure if this is how it should behave?
+                //
+                bl.parent_lookup_response::<BlockRequestState<Parent>>(id, peer_id, None, D, &cx);
                 rig.expect_penalty();
             }
         }
@@ -764,10 +823,10 @@ fn test_parent_lookup_too_many_download_attempts_no_blacklist() {
         }
         if i % 2 != 0 {
             // The request fails. It should be tried again.
-            bl.parent_lookup_failed(
+            bl.parent_lookup_failed::<BlockRequestState<Parent>>(
                 id,
                 peer_id,
-                &mut cx,
+                &cx,
                 RPCError::ErrorResponse(
                     RPCResponseErrorCode::ResourceUnavailable,
                     "older than deneb".into(),
@@ -776,7 +835,13 @@ fn test_parent_lookup_too_many_download_attempts_no_blacklist() {
         } else {
             // Send a bad block this time. It should be tried again.
             let bad_block = rig.rand_block(fork_name);
-            bl.parent_lookup_response(id, peer_id, Some(bad_block.into()), D, &mut cx);
+            bl.parent_lookup_response::<BlockRequestState<Parent>>(
+                id,
+                peer_id,
+                Some(bad_block.into()),
+                D,
+                &cx,
+            );
             rig.expect_penalty();
         }
         if i < parent_lookup::PARENT_FAIL_TOLERANCE {
@@ -825,10 +890,10 @@ fn test_parent_lookup_too_many_processing_attempts_must_blacklist() {
             let _ = rig.expect_parent_request(ResponseType::Blob);
         }
         // The request fails. It should be tried again.
-        bl.parent_lookup_failed(
+        bl.parent_lookup_failed::<BlockRequestState<Parent>>(
             id,
             peer_id,
-            &mut cx,
+            &cx,
             RPCError::ErrorResponse(
                 RPCResponseErrorCode::ResourceUnavailable,
                 "older than deneb".into(),
@@ -846,14 +911,15 @@ fn test_parent_lookup_too_many_processing_attempts_must_blacklist() {
         // we don't require a response because we're generateing 0-blob blocks in this test.
         assert!(!bl.failed_chains.contains(&block_root));
         // send the right parent but fail processing
-        bl.parent_lookup_response(id, peer_id, Some(parent.clone()), D, &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(
-        bl.parent_block_processed(
+            id,
-            block_root,
+            peer_id,
-            BlockError::InvalidSignature.into(),
+            Some(parent.clone()),
-            response_type,
+            D,
-            &mut cx,
+            &cx,
         );
-        bl.parent_lookup_response(id, peer_id, None, D, &mut cx);
+        bl.parent_block_processed(block_root, BlockError::InvalidSignature.into(), &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(id, peer_id, None, D, &cx);
         rig.expect_penalty();
     }
 
@@ -902,16 +968,21 @@ fn test_parent_lookup_too_deep() {
             let _ = rig.expect_parent_request(ResponseType::Blob);
         }
         // the block
-        bl.parent_lookup_response(id, peer_id, Some(block.clone()), D, &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(
+            id,
+            peer_id,
+            Some(block.clone()),
+            D,
+            &cx,
+        );
         // the stream termination
-        bl.parent_lookup_response(id, peer_id, None, D, &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(id, peer_id, None, D, &cx);
         // the processing request
         rig.expect_block_process(response_type);
         // the processing result
         bl.parent_block_processed(
             chain_hash,
             BlockError::ParentUnknown(block.into()).into(),
-            response_type,
             &mut cx,
         )
     }
@@ -962,16 +1033,22 @@ fn test_single_block_lookup_ignored_response() {
         PeerShouldHave::BlockAndBlobs(peer_id),
         &mut cx,
     );
-    let id = rig.expect_block_request(response_type);
+    let id = rig.expect_lookup_request(response_type);
     // If we're in deneb, a blob request should have been triggered as well,
     // we don't require a response because we're generateing 0-blob blocks in this test.
     if matches!(fork_name, ForkName::Deneb) {
-        let _ = rig.expect_block_request(ResponseType::Blob);
+        let _ = rig.expect_lookup_request(ResponseType::Blob);
     }
 
     // The peer provides the correct block, should not be penalized. Now the block should be sent
     // for processing.
-    bl.single_block_lookup_response(id, peer_id, Some(block.into()), D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(
+        id,
+        peer_id,
+        Some(block.into()),
+        D,
+        &cx,
+    );
     rig.expect_empty_network();
     rig.expect_block_process(response_type);
 
@@ -980,9 +1057,13 @@ fn test_single_block_lookup_ignored_response() {
 
     // Send the stream termination. Peer should have not been penalized, and the request removed
     // after processing.
-    bl.single_block_lookup_response(id, peer_id, None, D, &mut cx);
+    bl.single_lookup_response::<BlockRequestState<Current>>(id, peer_id, None, D, &cx);
     // Send an Ignored response, the request should be dropped
-    bl.single_block_component_processed(id, BlockProcessingResult::Ignored, response_type, &mut cx);
+    bl.single_block_component_processed::<BlockRequestState<Current>>(
+        id.id,
+        BlockProcessingResult::Ignored,
+        &mut cx,
+    );
     rig.expect_empty_network();
     assert_eq!(bl.single_block_lookups.len(), 0);
 }
@@ -1015,17 +1096,18 @@ fn test_parent_lookup_ignored_response() {
     }
 
     // Peer sends the right block, it should be sent for processing. Peer should not be penalized.
-    bl.parent_lookup_response(id, peer_id, Some(parent.into()), D, &mut cx);
+    bl.parent_lookup_response::<BlockRequestState<Parent>>(
+        id,
+        peer_id,
+        Some(parent.into()),
+        D,
+        &cx,
+    );
     rig.expect_block_process(response_type);
     rig.expect_empty_network();
 
     // Return an Ignored result. The request should be dropped
-    bl.parent_block_processed(
+    bl.parent_block_processed(chain_hash, BlockProcessingResult::Ignored, &mut cx);
-        chain_hash,
-        BlockProcessingResult::Ignored,
-        response_type,
-        &mut cx,
-    );
     rig.expect_empty_network();
     assert_eq!(bl.parent_lookups.len(), 0);
 }
@@ -1092,25 +1174,25 @@ fn test_same_chain_race_condition() {
             let _ = rig.expect_parent_request(ResponseType::Blob);
         }
         // the block
-        bl.parent_lookup_response(id, peer_id, Some(block.clone()), D, &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(
+            id,
+            peer_id,
+            Some(block.clone()),
+            D,
+            &cx,
+        );
         // the stream termination
-        bl.parent_lookup_response(id, peer_id, None, D, &mut cx);
+        bl.parent_lookup_response::<BlockRequestState<Parent>>(id, peer_id, None, D, &cx);
         // the processing request
         rig.expect_block_process(response_type);
         // the processing result
         if i + 2 == depth {
             // one block was removed
-            bl.parent_block_processed(
+            bl.parent_block_processed(chain_hash, BlockError::BlockIsAlreadyKnown.into(), &mut cx)
-                chain_hash,
-                BlockError::BlockIsAlreadyKnown.into(),
-                response_type,
-                &mut cx,
-            )
         } else {
             bl.parent_block_processed(
                 chain_hash,
                 BlockError::ParentUnknown(block.into()).into(),
-                response_type,
                 &mut cx,
             )
         }
@@ -1137,12 +1219,13 @@ fn test_same_chain_race_condition() {
     let process_result = BatchProcessResult::Success {
         was_non_empty: true,
     };
-    bl.parent_chain_processed(chain_hash, process_result, &mut cx);
+    bl.parent_chain_processed(chain_hash, process_result, &cx);
     assert_eq!(bl.parent_lookups.len(), 0);
 }
 
 mod deneb_only {
     use super::*;
+    use crate::sync::block_lookups::common::ResponseType;
     use beacon_chain::data_availability_checker::AvailabilityCheckError;
     use std::ops::IndexMut;
     use std::str::FromStr;
@@ -1156,10 +1239,10 @@ mod deneb_only {
         parent_block: Option<Arc<SignedBeaconBlock<E>>>,
         parent_blobs: Vec<Arc<BlobSidecar<E>>>,
         peer_id: PeerId,
-        block_req_id: Option<u32>,
+        block_req_id: Option<SingleLookupReqId>,
-        parent_block_req_id: Option<u32>,
+        parent_block_req_id: Option<SingleLookupReqId>,
-        blob_req_id: Option<u32>,
+        blob_req_id: Option<SingleLookupReqId>,
-        parent_blob_req_id: Option<u32>,
+        parent_blob_req_id: Option<SingleLookupReqId>,
         slot: Slot,
         block_root: Hash256,
     }
@@ -1202,8 +1285,8 @@ mod deneb_only {
                             PeerShouldHave::BlockAndBlobs(peer_id),
                             &mut cx,
                         );
-                        let block_req_id = rig.expect_block_request(ResponseType::Block);
+                        let block_req_id = rig.expect_lookup_request(ResponseType::Block);
-                        let blob_req_id = rig.expect_block_request(ResponseType::Blob);
+                        let blob_req_id = rig.expect_lookup_request(ResponseType::Blob);
                         (Some(block_req_id), Some(blob_req_id), None, None)
                     }
                     RequestTrigger::GossipUnknownParentBlock => {
@@ -1223,12 +1306,12 @@ mod deneb_only {
                         block_root = child_root;
                         bl.search_child_block(
                             child_root,
-                            Some(UnknownParentComponents::new(Some(child_block), None)),
+                            Some(CachedChildComponents::new(Some(child_block), None)),
                             &[PeerShouldHave::Neither(peer_id)],
                             &mut cx,
                         );
 
-                        let blob_req_id = rig.expect_block_request(ResponseType::Blob);
+                        let blob_req_id = rig.expect_lookup_request(ResponseType::Blob);
                         rig.expect_empty_network(); // expect no block request
                         bl.search_parent(slot, child_root, parent_root, peer_id, &mut cx);
                         let parent_block_req_id = rig.expect_parent_request(ResponseType::Block);
@@ -1261,13 +1344,13 @@ mod deneb_only {
                         *blobs.index_mut(0) = Some(child_blob);
                         bl.search_child_block(
                             child_root,
-                            Some(UnknownParentComponents::new(None, Some(blobs))),
+                            Some(CachedChildComponents::new(None, Some(blobs))),
                             &[PeerShouldHave::Neither(peer_id)],
                             &mut cx,
                         );
 
-                        let block_req_id = rig.expect_block_request(ResponseType::Block);
+                        let block_req_id = rig.expect_lookup_request(ResponseType::Block);
-                        let blobs_req_id = rig.expect_block_request(ResponseType::Blob);
+                        let blobs_req_id = rig.expect_lookup_request(ResponseType::Blob);
                         rig.expect_empty_network(); // expect no block request
                         bl.search_parent(slot, child_root, parent_root, peer_id, &mut cx);
                         let parent_block_req_id = rig.expect_parent_request(ResponseType::Block);
@@ -1281,8 +1364,8 @@ mod deneb_only {
                     }
                     RequestTrigger::GossipUnknownBlockOrBlob => {
                         bl.search_block(block_root, PeerShouldHave::Neither(peer_id), &mut cx);
-                        let block_req_id = rig.expect_block_request(ResponseType::Block);
+                        let block_req_id = rig.expect_lookup_request(ResponseType::Block);
-                        let blob_req_id = rig.expect_block_request(ResponseType::Blob);
+                        let blob_req_id = rig.expect_lookup_request(ResponseType::Blob);
                         (Some(block_req_id), Some(blob_req_id), None, None)
                     }
                 };
@@ -1307,12 +1390,12 @@ mod deneb_only {
 
         fn parent_block_response(mut self) -> Self {
             self.rig.expect_empty_network();
-            self.bl.parent_lookup_response(
+            self.bl.parent_lookup_response::<BlockRequestState<Parent>>(
                 self.parent_block_req_id.expect("parent request id"),
                 self.peer_id,
                 self.parent_block.clone(),
                 D,
-                &mut self.cx,
+                &self.cx,
             );
 
             assert_eq!(self.bl.parent_lookups.len(), 1);
@@ -1321,22 +1404,24 @@ mod deneb_only {
 
         fn parent_blob_response(mut self) -> Self {
             for blob in &self.parent_blobs {
-                self.bl.parent_lookup_blob_response(
+                self.bl
-                    self.parent_blob_req_id.expect("parent blob request id"),
+                    .parent_lookup_response::<BlobRequestState<Parent, E>>(
-                    self.peer_id,
+                        self.parent_blob_req_id.expect("parent blob request id"),
-                    Some(blob.clone()),
+                        self.peer_id,
-                    D,
+                        Some(blob.clone()),
-                    &mut self.cx,
+                        D,
-                );
+                        &self.cx,
+                    );
                 assert_eq!(self.bl.parent_lookups.len(), 1);
             }
-            self.bl.parent_lookup_blob_response(
+            self.bl
-                self.parent_blob_req_id.expect("blob request id"),
+                .parent_lookup_response::<BlobRequestState<Parent, E>>(
-                self.peer_id,
+                    self.parent_blob_req_id.expect("blob request id"),
-                None,
+                    self.peer_id,
-                D,
+                    None,
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
 
             self
         }
@@ -1353,13 +1438,14 @@ mod deneb_only {
         fn block_response(mut self) -> Self {
             // The peer provides the correct block, should not be penalized. Now the block should be sent
             // for processing.
-            self.bl.single_block_lookup_response(
+            self.bl
-                self.block_req_id.expect("block request id"),
+                .single_lookup_response::<BlockRequestState<Current>>(
-                self.peer_id,
+                    self.block_req_id.expect("block request id"),
-                self.block.clone(),
+                    self.peer_id,
-                D,
+                    self.block.clone(),
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
             self.rig.expect_empty_network();
 
             // The request should still be active.
@@ -1369,22 +1455,24 @@ mod deneb_only {
 
         fn blobs_response(mut self) -> Self {
             for blob in &self.blobs {
-                self.bl.single_blob_lookup_response(
+                self.bl
-                    self.blob_req_id.expect("blob request id"),
+                    .single_lookup_response::<BlobRequestState<Current, E>>(
-                    self.peer_id,
+                        self.blob_req_id.expect("blob request id"),
-                    Some(blob.clone()),
+                        self.peer_id,
-                    D,
+                        Some(blob.clone()),
-                    &mut self.cx,
+                        D,
-                );
+                        &self.cx,
+                    );
                 assert_eq!(self.bl.single_block_lookups.len(), 1);
             }
-            self.bl.single_blob_lookup_response(
+            self.bl
-                self.blob_req_id.expect("blob request id"),
+                .single_lookup_response::<BlobRequestState<Current, E>>(
-                self.peer_id,
+                    self.blob_req_id.expect("blob request id"),
-                None,
+                    self.peer_id,
-                D,
+                    None,
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
             self
         }
 
@@ -1402,58 +1490,63 @@ mod deneb_only {
         }
 
         fn empty_block_response(mut self) -> Self {
-            self.bl.single_block_lookup_response(
+            self.bl
-                self.block_req_id.expect("block request id"),
+                .single_lookup_response::<BlockRequestState<Current>>(
-                self.peer_id,
+                    self.block_req_id.expect("block request id"),
-                None,
+                    self.peer_id,
-                D,
+                    None,
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
             self
         }
 
         fn empty_blobs_response(mut self) -> Self {
-            self.bl.single_blob_lookup_response(
+            self.bl
-                self.blob_req_id.expect("blob request id"),
+                .single_lookup_response::<BlobRequestState<Current, E>>(
-                self.peer_id,
+                    self.blob_req_id.expect("blob request id"),
-                None,
+                    self.peer_id,
-                D,
+                    None,
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
             self
         }
 
         fn empty_parent_block_response(mut self) -> Self {
-            self.bl.parent_lookup_response(
+            self.bl.parent_lookup_response::<BlockRequestState<Parent>>(
                 self.parent_block_req_id.expect("block request id"),
                 self.peer_id,
                 None,
                 D,
-                &mut self.cx,
+                &self.cx,
             );
             self
         }
 
         fn empty_parent_blobs_response(mut self) -> Self {
-            self.bl.parent_lookup_blob_response(
+            self.bl
-                self.parent_blob_req_id.expect("blob request id"),
+                .parent_lookup_response::<BlobRequestState<Parent, E>>(
-                self.peer_id,
+                    self.parent_blob_req_id.expect("blob request id"),
-                None,
+                    self.peer_id,
-                D,
+                    None,
-                &mut self.cx,
+                    D,
-            );
+                    &self.cx,
+                );
             self
         }
 
         fn block_imported(mut self) -> Self {
             // Missing blobs should be the request is not removed, the outstanding blobs request should
             // mean we do not send a new request.
-            self.bl.single_block_component_processed(
+            self.bl
-                self.block_req_id.expect("block request id"),
+                .single_block_component_processed::<BlockRequestState<Current>>(
-                BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(self.block_root)),
+                    self.block_req_id.expect("block request id").id,
-                ResponseType::Block,
+                    BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(
-                &mut self.cx,
+                        self.block_root,
-            );
+                    )),
+                    &mut self.cx,
+                );
             self.rig.expect_empty_network();
             assert_eq!(self.bl.single_block_lookups.len(), 0);
             self
@@ -1463,7 +1556,6 @@ mod deneb_only {
             self.bl.parent_block_processed(
                 self.block_root,
                 BlockProcessingResult::Ok(AvailabilityProcessingStatus::Imported(self.block_root)),
-                ResponseType::Block,
                 &mut self.cx,
             );
             self.rig.expect_empty_network();
@@ -1477,7 +1569,6 @@ mod deneb_only {
                 BlockProcessingResult::Err(BlockError::ParentUnknown(RpcBlock::new_without_blobs(
                     self.parent_block.clone().expect("parent block"),
                 ))),
-                ResponseType::Block,
                 &mut self.cx,
             );
             assert_eq!(self.bl.parent_lookups.len(), 1);
@@ -1488,7 +1579,6 @@ mod deneb_only {
             self.bl.parent_block_processed(
                 self.block_root,
                 BlockProcessingResult::Err(BlockError::ProposalSignatureInvalid),
-                ResponseType::Block,
                 &mut self.cx,
             );
             assert_eq!(self.bl.parent_lookups.len(), 1);
@@ -1496,53 +1586,53 @@ mod deneb_only {
         }
 
         fn invalid_block_processed(mut self) -> Self {
-            self.bl.single_block_component_processed(
+            self.bl
-                self.block_req_id.expect("block request id"),
+                .single_block_component_processed::<BlockRequestState<Current>>(
-                BlockProcessingResult::Err(BlockError::ProposalSignatureInvalid),
+                    self.block_req_id.expect("block request id").id,
-                ResponseType::Block,
+                    BlockProcessingResult::Err(BlockError::ProposalSignatureInvalid),
-                &mut self.cx,
+                    &mut self.cx,
-            );
+                );
             assert_eq!(self.bl.single_block_lookups.len(), 1);
             self
         }
 
         fn invalid_blob_processed(mut self) -> Self {
-            self.bl.single_block_component_processed(
+            self.bl
-                self.blob_req_id.expect("blob request id"),
+                .single_block_component_processed::<BlobRequestState<Current, E>>(
-                BlockProcessingResult::Err(BlockError::AvailabilityCheck(
+                    self.blob_req_id.expect("blob request id").id,
-                    AvailabilityCheckError::KzgVerificationFailed,
+                    BlockProcessingResult::Err(BlockError::AvailabilityCheck(
-                )),
+                        AvailabilityCheckError::KzgVerificationFailed,
-                ResponseType::Blob,
+                    )),
-                &mut self.cx,
+                    &mut self.cx,
-            );
+                );
             assert_eq!(self.bl.single_block_lookups.len(), 1);
             self
         }
 
         fn missing_components_from_block_request(mut self) -> Self {
-            self.bl.single_block_component_processed(
+            self.bl
-                self.block_req_id.expect("block request id"),
+                .single_block_component_processed::<BlockRequestState<Current>>(
-                BlockProcessingResult::Ok(AvailabilityProcessingStatus::MissingComponents(
+                    self.block_req_id.expect("block request id").id,
-                    self.slot,
+                    BlockProcessingResult::Ok(AvailabilityProcessingStatus::MissingComponents(
-                    self.block_root,
+                        self.slot,
-                )),
+                        self.block_root,
-                ResponseType::Block,
+                    )),
-                &mut self.cx,
+                    &mut self.cx,
-            );
+                );
             assert_eq!(self.bl.single_block_lookups.len(), 1);
             self
         }
 
         fn missing_components_from_blob_request(mut self) -> Self {
-            self.bl.single_block_component_processed(
+            self.bl
-                self.blob_req_id.expect("blob request id"),
+                .single_block_component_processed::<BlobRequestState<Current, E>>(
-                BlockProcessingResult::Ok(AvailabilityProcessingStatus::MissingComponents(
+                    self.blob_req_id.expect("blob request id").id,
-                    self.slot,
+                    BlockProcessingResult::Ok(AvailabilityProcessingStatus::MissingComponents(
-                    self.block_root,
+                        self.slot,
-                )),
+                        self.block_root,
-                ResponseType::Blob,
+                    )),
-                &mut self.cx,
+                    &mut self.cx,
-            );
+                );
             assert_eq!(self.bl.single_block_lookups.len(), 1);
             self
         }
@@ -1556,12 +1646,12 @@ mod deneb_only {
             self
         }
         fn expect_block_request(mut self) -> Self {
-            let id = self.rig.expect_block_request(ResponseType::Block);
+            let id = self.rig.expect_lookup_request(ResponseType::Block);
             self.block_req_id = Some(id);
             self
         }
         fn expect_blobs_request(mut self) -> Self {
-            let id = self.rig.expect_block_request(ResponseType::Blob);
+            let id = self.rig.expect_lookup_request(ResponseType::Blob);
             self.blob_req_id = Some(id);
             self
         }

beacon_node/network/src/sync/manager.rs

@@ -41,10 +41,10 @@ use super::range_sync::{RangeSync, RangeSyncType, EPOCHS_PER_BATCH};
 use crate::network_beacon_processor::{ChainSegmentProcessId, NetworkBeaconProcessor};
 use crate::service::NetworkMessage;
 use crate::status::ToStatusMessage;
+use crate::sync::block_lookups::common::{Current, Parent};
 use crate::sync::block_lookups::delayed_lookup;
 use crate::sync::block_lookups::delayed_lookup::DelayedLookupMessage;
-pub use crate::sync::block_lookups::ResponseType;
+use crate::sync::block_lookups::{BlobRequestState, BlockRequestState, CachedChildComponents};
-use crate::sync::block_lookups::UnknownParentComponents;
 use crate::sync::range_sync::ByRangeRequestType;
 use beacon_chain::block_verification_types::AsBlock;
 use beacon_chain::block_verification_types::RpcBlock;
@@ -83,13 +83,25 @@ pub const DELAY_QUEUE_CHANNEL_SIZE: usize = 128;
 
 pub type Id = u32;
 
+#[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
+pub struct SingleLookupReqId {
+    pub id: Id,
+    pub req_counter: Id,
+}
+
 /// Id of rpc requests sent by sync to the network.
 #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
 pub enum RequestId {
     /// Request searching for a block given a hash.
-    SingleBlock { id: Id },
+    SingleBlock { id: SingleLookupReqId },
-    /// Request searching for a block's parent. The id is the chain
+    /// Request searching for a set of blobs given a hash.
-    ParentLookup { id: Id },
+    SingleBlob { id: SingleLookupReqId },
+    /// Request searching for a block's parent. The id is the chain, share with the corresponding
+    /// blob id.
+    ParentLookup { id: SingleLookupReqId },
+    /// Request searching for a block's parent blobs. The id is the chain, shared with the corresponding
+    /// block id.
+    ParentLookupBlob { id: SingleLookupReqId },
     /// Request was from the backfill sync algorithm.
     BackFillBlocks { id: Id },
     /// Backfill request that is composed by both a block range request and a blob range request.
@@ -100,10 +112,6 @@ pub enum RequestId {
     RangeBlockAndBlobs { id: Id },
 }
 
-// TODO(diva) I'm updating functions what at a time, but this should be revisited because I think
-// some code paths that are split for blobs and blocks can be made just one after sync as a whole
-// is updated.
-
 #[derive(Debug)]
 /// A message that can be sent to the sync manager thread.
 pub enum SyncMessage<T: EthSpec> {
@@ -166,7 +174,6 @@ pub enum SyncMessage<T: EthSpec> {
     BlockComponentProcessed {
         process_type: BlockProcessType,
         result: BlockProcessingResult<T>,
-        response_type: ResponseType,
     },
 }
 
@@ -174,6 +181,7 @@ pub enum SyncMessage<T: EthSpec> {
 #[derive(Debug, Clone)]
 pub enum BlockProcessType {
     SingleBlock { id: Id },
+    SingleBlob { id: Id },
     ParentLookup { chain_hash: Hash256 },
 }
 
@@ -324,16 +332,40 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         trace!(self.log, "Sync manager received a failed RPC");
         match request_id {
             RequestId::SingleBlock { id } => {
-                self.block_lookups.single_block_lookup_failed(
+                self.block_lookups
-                    id,
+                    .single_block_lookup_failed::<BlockRequestState<Current>>(
-                    &peer_id,
+                        id,
-                    &mut self.network,
+                        &peer_id,
-                    error,
+                        &self.network,
-                );
+                        error,
+                    );
+            }
+            RequestId::SingleBlob { id } => {
+                self.block_lookups
+                    .single_block_lookup_failed::<BlobRequestState<Current, T::EthSpec>>(
+                        id,
+                        &peer_id,
+                        &self.network,
+                        error,
+                    );
             }
             RequestId::ParentLookup { id } => {
                 self.block_lookups
-                    .parent_lookup_failed(id, peer_id, &mut self.network, error);
+                    .parent_lookup_failed::<BlockRequestState<Parent>>(
+                        id,
+                        peer_id,
+                        &self.network,
+                        error,
+                    );
+            }
+            RequestId::ParentLookupBlob { id } => {
+                self.block_lookups
+                    .parent_lookup_failed::<BlobRequestState<Parent, T::EthSpec>>(
+                        id,
+                        peer_id,
+                        &self.network,
+                        error,
+                    );
             }
             RequestId::BackFillBlocks { id } => {
                 if let Some(batch_id) = self
@@ -628,6 +660,10 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 let block_root = blob.block_root;
                 let parent_root = blob.block_parent_root;
                 let blob_index = blob.index;
+                if blob_index >= T::EthSpec::max_blobs_per_block() as u64 {
+                    warn!(self.log, "Peer sent blob with invalid index"; "index" => blob_index, "peer_id" => %peer_id);
+                    return;
+                }
                 let mut blobs = FixedBlobSidecarList::default();
                 *blobs.index_mut(blob_index as usize) = Some(blob);
                 self.handle_unknown_parent(
@@ -635,7 +671,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                     block_root,
                     parent_root,
                     blob_slot,
-                    Some(UnknownParentComponents::new(None, Some(blobs))),
+                    Some(CachedChildComponents::new(None, Some(blobs))),
                 );
             }
             SyncMessage::UnknownBlockHashFromAttestation(peer_id, block_hash) => {
@@ -652,8 +688,11 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 // If we are not synced, ignore this block.
                 if self.synced_and_connected(&peer_id) {
                     if self.should_delay_lookup(slot) {
-                        self.block_lookups
+                        self.block_lookups.search_block_delayed(
-                            .search_block_delayed(block_root, PeerShouldHave::Neither(peer_id));
+                            block_root,
+                            PeerShouldHave::Neither(peer_id),
+                            &mut self.network,
+                        );
                         if let Err(e) = self
                             .delayed_lookups
                             .try_send(DelayedLookupMessage::MissingComponents(block_root))
@@ -670,16 +709,9 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                     }
                 }
             }
-            SyncMessage::MissingGossipBlockComponentsDelayed(block_root) => {
+            SyncMessage::MissingGossipBlockComponentsDelayed(block_root) => self
-                if self
+                .block_lookups
-                    .block_lookups
+                .trigger_lookup_by_root(block_root, &self.network),
-                    .trigger_lookup_by_root(block_root, &mut self.network)
-                    .is_err()
-                {
-                    // No request was made for block or blob so the lookup is dropped.
-                    self.block_lookups.remove_lookup_by_root(block_root);
-                }
-            }
             SyncMessage::Disconnect(peer_id) => {
                 self.peer_disconnect(&peer_id);
             }
@@ -691,14 +723,24 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             SyncMessage::BlockComponentProcessed {
                 process_type,
                 result,
-                response_type,
             } => match process_type {
                 BlockProcessType::SingleBlock { id } => self
                     .block_lookups
-                    .single_block_component_processed(id, result, response_type, &mut self.network),
+                    .single_block_component_processed::<BlockRequestState<Current>>(
+                        id,
+                        result,
+                        &mut self.network,
+                    ),
+                BlockProcessType::SingleBlob { id } => self
+                    .block_lookups
+                    .single_block_component_processed::<BlobRequestState<Current, T::EthSpec>>(
+                        id,
+                        result,
+                        &mut self.network,
+                    ),
                 BlockProcessType::ParentLookup { chain_hash } => self
                     .block_lookups
-                    .parent_block_processed(chain_hash, result, response_type, &mut self.network),
+                    .parent_block_processed(chain_hash, result, &mut self.network),
             },
             SyncMessage::BatchProcessed { sync_type, result } => match sync_type {
                 ChainSegmentProcessId::RangeBatchId(chain_id, epoch) => {
@@ -727,7 +769,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 }
                 ChainSegmentProcessId::ParentLookup(chain_hash) => self
                     .block_lookups
-                    .parent_chain_processed(chain_hash, result, &mut self.network),
+                    .parent_chain_processed(chain_hash, result, &self.network),
             },
         }
     }
@@ -738,7 +780,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         block_root: Hash256,
         parent_root: Hash256,
         slot: Slot,
-        parent_components: Option<UnknownParentComponents<T::EthSpec>>,
+        child_components: Option<CachedChildComponents<T::EthSpec>>,
     ) {
         if self.should_search_for_block(slot, &peer_id) {
             self.block_lookups.search_parent(
@@ -751,8 +793,9 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             if self.should_delay_lookup(slot) {
                 self.block_lookups.search_child_delayed(
                     block_root,
-                    parent_components,
+                    child_components,
                     &[PeerShouldHave::Neither(peer_id)],
+                    &mut self.network,
                 );
                 if let Err(e) = self
                     .delayed_lookups
@@ -763,7 +806,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             } else {
                 self.block_lookups.search_child_block(
                     block_root,
-                    parent_components,
+                    child_components,
                     &[PeerShouldHave::Neither(peer_id)],
                     &mut self.network,
                 );
@@ -883,20 +926,30 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         seen_timestamp: Duration,
     ) {
         match request_id {
-            RequestId::SingleBlock { id } => self.block_lookups.single_block_lookup_response(
+            RequestId::SingleBlock { id } => self
-                id,
+                .block_lookups
-                peer_id,
+                .single_lookup_response::<BlockRequestState<Current>>(
-                block,
+                    id,
-                seen_timestamp,
+                    peer_id,
-                &mut self.network,
+                    block,
-            ),
+                    seen_timestamp,
-            RequestId::ParentLookup { id } => self.block_lookups.parent_lookup_response(
+                    &self.network,
-                id,
+                ),
-                peer_id,
+            RequestId::SingleBlob { .. } => {
-                block,
+                crit!(self.log, "Block received during blob request"; "peer_id" => %peer_id  );
-                seen_timestamp,
+            }
-                &mut self.network,
+            RequestId::ParentLookup { id } => self
-            ),
+                .block_lookups
+                .parent_lookup_response::<BlockRequestState<Parent>>(
+                    id,
+                    peer_id,
+                    block,
+                    seen_timestamp,
+                    &self.network,
+                ),
+            RequestId::ParentLookupBlob { id: _ } => {
+                crit!(self.log, "Block received during parent blob request"; "peer_id" => %peer_id  );
+            }
             RequestId::BackFillBlocks { id } => {
                 let is_stream_terminator = block.is_none();
                 if let Some(batch_id) = self
@@ -954,20 +1007,31 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         seen_timestamp: Duration,
     ) {
         match request_id {
-            RequestId::SingleBlock { id } => self.block_lookups.single_blob_lookup_response(
+            RequestId::SingleBlock { .. } => {
-                id,
+                crit!(self.log, "Single blob received during block request"; "peer_id" => %peer_id  );
-                peer_id,
+            }
-                blob,
+            RequestId::SingleBlob { id } => self
-                seen_timestamp,
+                .block_lookups
-                &mut self.network,
+                .single_lookup_response::<BlobRequestState<Current, T::EthSpec>>(
-            ),
+                    id,
-            RequestId::ParentLookup { id } => self.block_lookups.parent_lookup_blob_response(
+                    peer_id,
-                id,
+                    blob,
-                peer_id,
+                    seen_timestamp,
-                blob,
+                    &self.network,
-                seen_timestamp,
+                ),
-                &mut self.network,
+
-            ),
+            RequestId::ParentLookup { id: _ } => {
+                crit!(self.log, "Single blob received during parent block request"; "peer_id" => %peer_id  );
+            }
+            RequestId::ParentLookupBlob { id } => self
+                .block_lookups
+                .parent_lookup_response::<BlobRequestState<Parent, T::EthSpec>>(
+                    id,
+                    peer_id,
+                    blob,
+                    seen_timestamp,
+                    &self.network,
+                ),
             RequestId::BackFillBlocks { id: _ } => {
                 crit!(self.log, "Blob received during backfill block request"; "peer_id" => %peer_id  );
             }

beacon_node/network/src/sync/mod.rs

@@ -9,6 +9,6 @@ mod network_context;
 mod peer_sync_info;
 mod range_sync;
 
-pub use block_lookups::UnknownParentComponents;
+pub use block_lookups::CachedChildComponents;
 pub use manager::{BatchProcessResult, SyncMessage};
 pub use range_sync::{BatchOperationOutcome, ChainId};

beacon_node/network/src/sync/network_context.rs

@@ -7,7 +7,8 @@ use super::range_sync::{BatchId, ByRangeRequestType, ChainId};
 use crate::network_beacon_processor::NetworkBeaconProcessor;
 use crate::service::{NetworkMessage, RequestId};
 use crate::status::ToStatusMessage;
-use crate::sync::block_lookups::{BlobRequestId, BlockRequestId};
+use crate::sync::block_lookups::common::LookupType;
+use crate::sync::manager::SingleLookupReqId;
 use beacon_chain::block_verification_types::RpcBlock;
 use beacon_chain::{BeaconChain, BeaconChainTypes, EngineState};
 use fnv::FnvHashMap;
@@ -62,7 +63,7 @@ pub struct SyncNetworkContext<T: BeaconChainTypes> {
     pub chain: Arc<BeaconChain<T>>,
 
     /// Logger for the `SyncNetworkContext`.
-    log: slog::Logger,
+    pub log: slog::Logger,
 }
 
 /// Small enumeration to make dealing with block and blob requests easier.
@@ -118,11 +119,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
             .unwrap_or_default()
     }
 
-    pub fn status_peers<C: ToStatusMessage>(
+    pub fn status_peers<C: ToStatusMessage>(&self, chain: &C, peers: impl Iterator<Item = PeerId>) {
-        &mut self,
-        chain: &C,
-        peers: impl Iterator<Item = PeerId>,
-    ) {
         let status_message = chain.status_message();
         for peer_id in peers {
             debug!(
@@ -408,21 +405,26 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         }
     }
 
-    /// Sends a blocks by root request for a parent request.
+    pub fn block_lookup_request(
-    pub fn single_block_lookup_request(
+        &self,
-        &mut self,
+        id: SingleLookupReqId,
         peer_id: PeerId,
         request: BlocksByRootRequest,
-    ) -> Result<Id, &'static str> {
+        lookup_type: LookupType,
-        let id = self.next_id();
+    ) -> Result<(), &'static str> {
-        let request_id = RequestId::Sync(SyncRequestId::SingleBlock { id });
+        let sync_id = match lookup_type {
+            LookupType::Current => SyncRequestId::SingleBlock { id },
+            LookupType::Parent => SyncRequestId::ParentLookup { id },
+        };
+        let request_id = RequestId::Sync(sync_id);
 
         trace!(
             self.log,
             "Sending BlocksByRoot Request";
             "method" => "BlocksByRoot",
             "count" => request.block_roots().len(),
-            "peer" => %peer_id
+            "peer" => %peer_id,
+            "lookup_type" => ?lookup_type
         );
 
         self.send_network_msg(NetworkMessage::SendRequest {
@@ -430,82 +432,39 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
             request: Request::BlocksByRoot(request),
             request_id,
         })?;
-        Ok(id)
+        Ok(())
     }
 
-    /// Sends a blobs by root request for a parent request.
+    pub fn blob_lookup_request(
-    pub fn single_blobs_lookup_request(
+        &self,
-        &mut self,
+        id: SingleLookupReqId,
-        peer_id: PeerId,
+        blob_peer_id: PeerId,
-        request: BlobsByRootRequest,
+        blob_request: BlobsByRootRequest,
-    ) -> Result<Id, &'static str> {
+        lookup_type: LookupType,
-        let id = self.next_id();
+    ) -> Result<(), &'static str> {
-        let request_id = RequestId::Sync(SyncRequestId::SingleBlock { id });
+        let sync_id = match lookup_type {
+            LookupType::Current => SyncRequestId::SingleBlob { id },
+            LookupType::Parent => SyncRequestId::ParentLookupBlob { id },
+        };
+        let request_id = RequestId::Sync(sync_id);
 
-        trace!(
+        if !blob_request.blob_ids.is_empty() {
-            self.log,
+            trace!(
-            "Sending BlobsByRoot Request";
+                self.log,
-            "method" => "BlobsByRoot",
+                "Sending BlobsByRoot Request";
-            "count" => request.blob_ids.len(),
+                "method" => "BlobsByRoot",
-            "peer" => %peer_id
+                "count" => blob_request.blob_ids.len(),
-        );
+                "peer" => %blob_peer_id,
+                "lookup_type" => ?lookup_type
+            );
 
-        self.send_network_msg(NetworkMessage::SendRequest {
+            self.send_network_msg(NetworkMessage::SendRequest {
-            peer_id,
+                peer_id: blob_peer_id,
-            request: Request::BlobsByRoot(request),
+                request: Request::BlobsByRoot(blob_request),
-            request_id,
+                request_id,
-        })?;
+            })?;
-        Ok(id)
+        }
-    }
+        Ok(())
-
-    /// Sends a blocks by root request for a parent request.
-    pub fn parent_lookup_block_request(
-        &mut self,
-        peer_id: PeerId,
-        request: BlocksByRootRequest,
-    ) -> Result<BlockRequestId, &'static str> {
-        let id = self.next_id();
-        let request_id = RequestId::Sync(SyncRequestId::ParentLookup { id });
-
-        trace!(
-            self.log,
-            "Sending parent BlocksByRoot Request";
-            "method" => "BlocksByRoot",
-            "count" => request.block_roots().len(),
-            "peer" => %peer_id
-        );
-
-        self.send_network_msg(NetworkMessage::SendRequest {
-            peer_id,
-            request: Request::BlocksByRoot(request),
-            request_id,
-        })?;
-        Ok(id)
-    }
-
-    /// Sends a blocks by root request for a parent request.
-    pub fn parent_lookup_blobs_request(
-        &mut self,
-        peer_id: PeerId,
-        request: BlobsByRootRequest,
-    ) -> Result<BlobRequestId, &'static str> {
-        let id = self.next_id();
-        let request_id = RequestId::Sync(SyncRequestId::ParentLookup { id });
-
-        trace!(
-            self.log,
-            "Sending parent BlobsByRoot Request";
-            "method" => "BlobsByRoot",
-            "count" => request.blob_ids.len(),
-            "peer" => %peer_id
-        );
-
-        self.send_network_msg(NetworkMessage::SendRequest {
-            peer_id,
-            request: Request::BlobsByRoot(request),
-            request_id,
-        })?;
-        Ok(id)
     }
 
     pub fn is_execution_engine_online(&self) -> bool {
@@ -532,7 +491,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
     }
 
     /// Reports to the scoring algorithm the behaviour of a peer.
-    pub fn report_peer(&mut self, peer_id: PeerId, action: PeerAction, msg: &'static str) {
+    pub fn report_peer(&self, peer_id: PeerId, action: PeerAction, msg: &'static str) {
         debug!(self.log, "Sync reporting peer"; "peer_id" => %peer_id, "action" => %action);
         self.network_send
             .send(NetworkMessage::ReportPeer {
@@ -547,7 +506,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
     }
 
     /// Subscribes to core topics.
-    pub fn subscribe_core_topics(&mut self) {
+    pub fn subscribe_core_topics(&self) {
         self.network_send
             .send(NetworkMessage::SubscribeCoreTopics)
             .unwrap_or_else(|e| {
@@ -556,7 +515,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
     }
 
     /// Sends an arbitrary network message.
-    fn send_network_msg(&mut self, msg: NetworkMessage<T::EthSpec>) -> Result<(), &'static str> {
+    fn send_network_msg(&self, msg: NetworkMessage<T::EthSpec>) -> Result<(), &'static str> {
         self.network_send.send(msg).map_err(|_| {
             debug!(self.log, "Could not send message to the network service");
             "Network channel send Failed"
@@ -572,7 +531,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         &self.network_beacon_processor
     }
 
-    fn next_id(&mut self) -> Id {
+    pub(crate) fn next_id(&mut self) -> Id {
         let id = self.request_id;
         self.request_id += 1;
         id
@@ -587,7 +546,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         const _: () = assert!(
             super::backfill_sync::BACKFILL_EPOCHS_PER_BATCH == 1
                 && super::range_sync::EPOCHS_PER_BATCH == 1,
-            "To deal with alignment with 4844 boundaries, batches need to be of just one epoch"
+            "To deal with alignment with deneb boundaries, batches need to be of just one epoch"
         );
 
         #[cfg(test)]
@@ -596,16 +555,14 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
             ByRangeRequestType::Blocks
         }
         #[cfg(not(test))]
-        {
+        if let Some(data_availability_boundary) = self.chain.data_availability_boundary() {
-            if let Some(data_availability_boundary) = self.chain.data_availability_boundary() {
+            if epoch >= data_availability_boundary {
-                if epoch >= data_availability_boundary {
+                ByRangeRequestType::BlocksAndBlobs
-                    ByRangeRequestType::BlocksAndBlobs
-                } else {
-                    ByRangeRequestType::Blocks
-                }
             } else {
                 ByRangeRequestType::Blocks
             }
+        } else {
+            ByRangeRequestType::Blocks
         }
     }
 }