feat: add beacon_blocks_by_head reqresp

packages/beacon-node/src/network/interface.ts

@@ -78,6 +78,7 @@ export interface INetwork extends INetworkCorePublic {
   // ReqResp
   sendBeaconBlocksByRange(peerId: PeerIdStr, request: phase0.BeaconBlocksByRangeRequest): Promise<SignedBeaconBlock[]>;
   sendBeaconBlocksByRoot(peerId: PeerIdStr, request: BeaconBlocksByRootRequest): Promise<SignedBeaconBlock[]>;
+  sendBeaconBlocksByHead(peerId: PeerIdStr, request: fulu.BeaconBlocksByHeadRequest): Promise<SignedBeaconBlock[]>;
   sendBlobSidecarsByRange(peerId: PeerIdStr, request: deneb.BlobSidecarsByRangeRequest): Promise<deneb.BlobSidecar[]>;
   sendBlobSidecarsByRoot(peerId: PeerIdStr, request: BlobSidecarsByRootRequest): Promise<deneb.BlobSidecar[]>;
   sendDataColumnSidecarsByRange(

packages/beacon-node/src/network/network.ts

@@ -578,6 +578,18 @@ export class Network implements INetwork {
     );
   }
 
+  async sendBeaconBlocksByHead(
+    peerId: PeerIdStr,
+    request: fulu.BeaconBlocksByHeadRequest
+  ): Promise<SignedBeaconBlock[]> {
+    return collectMaxResponseTypedWithBytes(
+      this.sendReqRespRequest(peerId, ReqRespMethod.BeaconBlocksByHead, [Version.V1], request),
+      Math.min(request.count, this.config.MAX_REQUEST_BLOCKS_DENEB),
+      responseSszTypeByMethod[ReqRespMethod.BeaconBlocksByHead],
+      this.chain.serializedCache
+    );
+  }
+
   async sendLightClientBootstrap(peerId: PeerIdStr, request: Root): Promise<LightClientBootstrap> {
     return collectExactOneTyped(
       this.sendReqRespRequest(peerId, ReqRespMethod.LightClientBootstrap, [Version.V1], request),

packages/beacon-node/src/network/reqresp/ReqRespBeaconNode.ts

@@ -286,6 +286,7 @@ export class ReqRespBeaconNode extends ReqResp {
         // instead of protocol version. This is not easily fixable with our current architecture.
         // See https://github.com/ChainSafe/lodestar/pull/8168 for more details.
         [protocols.StatusV2(fork, this.config), this.onStatus.bind(this)],
+        [protocols.BeaconBlocksByHead(fork, this.config), this.getHandler(ReqRespMethod.BeaconBlocksByHead)],
         [
           protocols.DataColumnSidecarsByRoot(fork, this.config),
           this.getHandler(ReqRespMethod.DataColumnSidecarsByRoot),

packages/beacon-node/src/network/reqresp/handlers/beaconBlocksByHead.ts

@@ -0,0 +1,91 @@
+import {PeerId} from "@libp2p/interface";
+import {BeaconConfig} from "@lodestar/config";
+import {ForkName, GENESIS_EPOCH, GENESIS_SLOT, isForkPostDeneb} from "@lodestar/params";
+import {RespStatus, ResponseError, ResponseOutgoing} from "@lodestar/reqresp";
+import {computeEpochAtSlot, computeStartSlotAtEpoch} from "@lodestar/state-transition";
+import {fulu} from "@lodestar/types";
+import {toRootHex} from "@lodestar/utils";
+import {IBeaconChain} from "../../../chain/index.js";
+import {getParentRootFromSignedBeaconBlockSerialized} from "../../../util/sszBytes.js";
+import {prettyPrintPeerId} from "../../util.js";
+
+// See https://github.com/ethereum/consensus-specs/pull/5181
+export async function* onBeaconBlocksByHead(
+  request: fulu.BeaconBlocksByHeadRequest,
+  chain: IBeaconChain,
+  peerId: PeerId,
+  peerClient: string
+): AsyncIterable<ResponseOutgoing> {
+  const currentFork = chain.config.getForkName(chain.clock.currentSlot);
+  const {beaconRoot, count} = validateBeaconBlocksByHeadRequest(currentFork, chain.config, request);
+
+  const requestedRootHex = toRootHex(beaconRoot);
+  let blockRootHex = requestedRootHex;
+  const minimumRequestEpoch = Math.max(
+    GENESIS_EPOCH,
+    chain.clock.currentEpoch - chain.config.MIN_EPOCHS_FOR_BLOCK_REQUESTS
+  );
+  const minimumRequestSlot = computeStartSlotAtEpoch(minimumRequestEpoch);
+
+  for (let blocksSent = 0; blocksSent < count; blocksSent++) {
+    const blockBytes = await chain.getSerializedBlockByRoot(blockRootHex);
+    if (!blockBytes) {
+      if (blocksSent === 0) {
+        throw new ResponseError(RespStatus.RESOURCE_UNAVAILABLE, `Unknown block root ${requestedRootHex}`);
+      }
+      return;
+    }
+
+    if (blockBytes.slot < minimumRequestSlot) {
+      if (blocksSent === 0) {
+        chain.logger.verbose("Peer requested unavailable block for BeaconBlocksByHead", {
+          peer: prettyPrintPeerId(peerId),
+          client: peerClient,
+          requestedRoot: requestedRootHex,
+          slot: blockBytes.slot,
+          minimumRequestSlot,
+        });
+      }
+      return;
+    }
+
+    yield {
+      data: blockBytes.block,
+      boundary: chain.config.getForkBoundaryAtEpoch(computeEpochAtSlot(blockBytes.slot)),
+    };
+
+    if (blockBytes.slot === GENESIS_SLOT) {
+      return;
+    }
+
+    const parentRootHex = getParentRootFromSignedBeaconBlockSerialized(blockBytes.block);
+    if (parentRootHex === null) {
+      throw new ResponseError(
+        RespStatus.SERVER_ERROR,
+        `Invalid block bytes for root ${blockRootHex} slot ${blockBytes.slot}`
+      );
+    }
+    blockRootHex = parentRootHex;
+  }
+}
+
+export function validateBeaconBlocksByHeadRequest(
+  fork: ForkName,
+  config: BeaconConfig,
+  request: fulu.BeaconBlocksByHeadRequest
+): fulu.BeaconBlocksByHeadRequest {
+  const {beaconRoot} = request;
+  let {count} = request;
+
+  if (count < 1) {
+    throw new ResponseError(RespStatus.INVALID_REQUEST, "count < 1");
+  }
+
+  const maxRequestBlocks = isForkPostDeneb(fork) ? config.MAX_REQUEST_BLOCKS_DENEB : config.MAX_REQUEST_BLOCKS;
+
+  if (count > maxRequestBlocks) {
+    count = maxRequestBlocks;
+  }
+
+  return {beaconRoot, count};
+}

packages/beacon-node/src/network/reqresp/handlers/index.ts

@@ -9,6 +9,7 @@ import {
   ExecutionPayloadEnvelopesByRootRequestType,
 } from "../../../util/types.js";
 import {GetReqRespHandlerFn, ReqRespMethod} from "../types.js";
+import {onBeaconBlocksByHead} from "./beaconBlocksByHead.js";
 import {onBeaconBlocksByRange} from "./beaconBlocksByRange.js";
 import {onBeaconBlocksByRoot} from "./beaconBlocksByRoot.js";
 import {onBlobSidecarsByRange} from "./blobSidecarsByRange.js";
@@ -47,6 +48,10 @@ export function getReqRespHandlers({db, chain}: {db: IBeaconDb; chain: IBeaconCh
       const body = BeaconBlocksByRootRequestType(fork, chain.config).deserialize(req.data);
       return onBeaconBlocksByRoot(body, chain);
     },
+    [ReqRespMethod.BeaconBlocksByHead]: (req, peerId, peerClient) => {
+      const body = ssz.fulu.BeaconBlocksByHeadRequest.deserialize(req.data);
+      return onBeaconBlocksByHead(body, chain, peerId, peerClient);
+    },
     [ReqRespMethod.BlobSidecarsByRoot]: (req) => {
       const fork = chain.config.getForkName(chain.clock.currentSlot);
       const body = BlobSidecarsByRootRequestType(fork, chain.config).deserialize(req.data);

packages/beacon-node/src/network/reqresp/interface.ts

@@ -33,7 +33,7 @@ export enum RespStatus {
    */
   SERVER_ERROR = 2,
   /**
-   * The responder does not have requested resource.  The response payload adheres to the ErrorMessage schema (described below). Note: This response code is only valid as a response to BlocksByRange
+   * The responder does not have requested resource. The response payload adheres to the ErrorMessage schema.
    */
   RESOURCE_UNAVAILABLE = 3,
   /**

packages/beacon-node/src/network/reqresp/protocols.ts

@@ -70,6 +70,12 @@ export const BeaconBlocksByRootV2 = toProtocol({
   contextBytesType: ContextBytesType.ForkDigest,
 });
 
+export const BeaconBlocksByHead = toProtocol({
+  method: ReqRespMethod.BeaconBlocksByHead,
+  version: Version.V1,
+  contextBytesType: ContextBytesType.ForkDigest,
+});
+
 export const BlobSidecarsByRange = toProtocol({
   method: ReqRespMethod.BlobSidecarsByRange,
   version: Version.V1,

packages/beacon-node/src/network/reqresp/rateLimit.ts

@@ -40,6 +40,10 @@ export const rateLimitQuotas: (fork: ForkName, config: BeaconConfig) => Record<R
     },
     getRequestCount: getRequestCountFn(fork, config, ReqRespMethod.BeaconBlocksByRoot, (req) => req.length),
   },
+  [ReqRespMethod.BeaconBlocksByHead]: {
+    byPeer: {quota: config.MAX_REQUEST_BLOCKS_DENEB, quotaTimeMs: 10_000},
+    getRequestCount: getRequestCountFn(fork, config, ReqRespMethod.BeaconBlocksByHead, (req) => req.count),
+  },
   [ReqRespMethod.BlobSidecarsByRange]: {
     // Rationale: MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK
     byPeer: {

packages/beacon-node/src/network/reqresp/score.ts

@@ -46,6 +46,7 @@ export function onOutgoingReqRespError(e: RequestError, method: ReqRespMethod):
           return PeerAction.LowToleranceError;
         case ReqRespMethod.BeaconBlocksByRange:
         case ReqRespMethod.BeaconBlocksByRoot:
+        case ReqRespMethod.BeaconBlocksByHead:
         case ReqRespMethod.ExecutionPayloadEnvelopesByRoot:
         case ReqRespMethod.ExecutionPayloadEnvelopesByRange:
           return PeerAction.MidToleranceError;

packages/beacon-node/src/network/reqresp/types.ts

@@ -42,6 +42,7 @@ export enum ReqRespMethod {
   Metadata = "metadata",
   BeaconBlocksByRange = "beacon_blocks_by_range",
   BeaconBlocksByRoot = "beacon_blocks_by_root",
+  BeaconBlocksByHead = "beacon_blocks_by_head",
   BlobSidecarsByRange = "blob_sidecars_by_range",
   BlobSidecarsByRoot = "blob_sidecars_by_root",
   DataColumnSidecarsByRange = "data_column_sidecars_by_range",
@@ -62,6 +63,7 @@ export type RequestBodyByMethod = {
   [ReqRespMethod.Metadata]: null;
   [ReqRespMethod.BeaconBlocksByRange]: phase0.BeaconBlocksByRangeRequest;
   [ReqRespMethod.BeaconBlocksByRoot]: BeaconBlocksByRootRequest;
+  [ReqRespMethod.BeaconBlocksByHead]: fulu.BeaconBlocksByHeadRequest;
   [ReqRespMethod.BlobSidecarsByRange]: deneb.BlobSidecarsByRangeRequest;
   [ReqRespMethod.BlobSidecarsByRoot]: BlobSidecarsByRootRequest;
   [ReqRespMethod.DataColumnSidecarsByRange]: fulu.DataColumnSidecarsByRangeRequest;
@@ -82,6 +84,7 @@ type ResponseBodyByMethod = {
   // Do not matter
   [ReqRespMethod.BeaconBlocksByRange]: SignedBeaconBlock;
   [ReqRespMethod.BeaconBlocksByRoot]: SignedBeaconBlock;
+  [ReqRespMethod.BeaconBlocksByHead]: SignedBeaconBlock;
   [ReqRespMethod.BlobSidecarsByRange]: deneb.BlobSidecar;
   [ReqRespMethod.BlobSidecarsByRoot]: deneb.BlobSidecar;
   [ReqRespMethod.DataColumnSidecarsByRange]: DataColumnSidecar;
@@ -111,6 +114,7 @@ export const requestSszTypeByMethod: (
 
   [ReqRespMethod.BeaconBlocksByRange]: ssz.phase0.BeaconBlocksByRangeRequest,
   [ReqRespMethod.BeaconBlocksByRoot]: BeaconBlocksByRootRequestType(fork, config),
+  [ReqRespMethod.BeaconBlocksByHead]: ssz.fulu.BeaconBlocksByHeadRequest,
   [ReqRespMethod.BlobSidecarsByRange]: ssz.deneb.BlobSidecarsByRangeRequest,
   [ReqRespMethod.BlobSidecarsByRoot]: BlobSidecarsByRootRequestType(fork, config),
   [ReqRespMethod.DataColumnSidecarsByRange]: ssz.fulu.DataColumnSidecarsByRangeRequest,
@@ -142,6 +146,7 @@ export const responseSszTypeByMethod: {[K in ReqRespMethod]: ResponseTypeGetter<
     version === Version.V1 ? ssz.phase0.Metadata : version === Version.V2 ? ssz.altair.Metadata : ssz.fulu.Metadata,
   [ReqRespMethod.BeaconBlocksByRange]: blocksResponseType,
   [ReqRespMethod.BeaconBlocksByRoot]: blocksResponseType,
+  [ReqRespMethod.BeaconBlocksByHead]: (fork) => ssz[fork].SignedBeaconBlock,
   [ReqRespMethod.BlobSidecarsByRange]: () => ssz.deneb.BlobSidecar,
   [ReqRespMethod.BlobSidecarsByRoot]: () => ssz.deneb.BlobSidecar,
   [ReqRespMethod.LightClientBootstrap]: (fork) => sszTypesFor(onlyPostAltairFork(fork)).LightClientBootstrap,