feat: implement SingleAttestation

packages/api/src/beacon/routes/beacon/pool.ts

@@ -1,7 +1,16 @@
 import {ValueOf} from "@chainsafe/ssz";
 import {ChainForkConfig} from "@lodestar/config";
-import {isForkPostElectra} from "@lodestar/params";
-import {AttesterSlashing, CommitteeIndex, Slot, capella, electra, phase0, ssz} from "@lodestar/types";
+import {ForkPostElectra, ForkPreElectra, isForkPostElectra} from "@lodestar/params";
+import {
+  AttesterSlashing,
+  CommitteeIndex,
+  SingleAttestation,
+  Slot,
+  capella,
+  electra,
+  phase0,
+  ssz,
+} from "@lodestar/types";
 import {
   ArrayOf,
   EmptyArgs,
@@ -20,6 +29,8 @@ import {MetaHeader, VersionCodec, VersionMeta} from "../../../utils/metadata.js"
 
 // See /packages/api/src/routes/index.ts for reasoning and instructions to add new routes
 
+const SingleAttestationListTypePhase0 = ArrayOf(ssz.phase0.Attestation);
+const SingleAttestationListTypeElectra = ArrayOf(ssz.electra.SingleAttestation);
 const AttestationListTypePhase0 = ArrayOf(ssz.phase0.Attestation);
 const AttestationListTypeElectra = ArrayOf(ssz.electra.Attestation);
 const AttesterSlashingListTypePhase0 = ArrayOf(ssz.phase0.AttesterSlashing);
@@ -142,7 +153,7 @@ export type Endpoints = {
    */
   submitPoolAttestations: Endpoint<
     "POST",
-    {signedAttestations: AttestationListPhase0},
+    {signedAttestations: SingleAttestation<ForkPreElectra>[]},
     {body: unknown},
     EmptyResponseData,
     EmptyMeta
@@ -158,7 +169,7 @@ export type Endpoints = {
    */
   submitPoolAttestationsV2: Endpoint<
     "POST",
-    {signedAttestations: AttestationList},
+    {signedAttestations: SingleAttestation[]},
     {body: unknown; headers: {[MetaHeader.Version]: string}},
     EmptyResponseData,
     EmptyMeta
@@ -316,10 +327,10 @@ export function getDefinitions(config: ChainForkConfig): RouteDefinitions<Endpoi
       url: "/eth/v1/beacon/pool/attestations",
       method: "POST",
       req: {
-        writeReqJson: ({signedAttestations}) => ({body: AttestationListTypePhase0.toJson(signedAttestations)}),
-        parseReqJson: ({body}) => ({signedAttestations: AttestationListTypePhase0.fromJson(body)}),
-        writeReqSsz: ({signedAttestations}) => ({body: AttestationListTypePhase0.serialize(signedAttestations)}),
-        parseReqSsz: ({body}) => ({signedAttestations: AttestationListTypePhase0.deserialize(body)}),
+        writeReqJson: ({signedAttestations}) => ({body: SingleAttestationListTypePhase0.toJson(signedAttestations)}),
+        parseReqJson: ({body}) => ({signedAttestations: SingleAttestationListTypePhase0.fromJson(body)}),
+        writeReqSsz: ({signedAttestations}) => ({body: SingleAttestationListTypePhase0.serialize(signedAttestations)}),
+        parseReqSsz: ({body}) => ({signedAttestations: SingleAttestationListTypePhase0.deserialize(body)}),
         schema: {
           body: Schema.ObjectArray,
         },
@@ -334,34 +345,34 @@ export function getDefinitions(config: ChainForkConfig): RouteDefinitions<Endpoi
           const fork = config.getForkName(signedAttestations[0]?.data.slot ?? 0);
           return {
             body: isForkPostElectra(fork)
-              ? AttestationListTypeElectra.toJson(signedAttestations as AttestationListElectra)
-              : AttestationListTypePhase0.toJson(signedAttestations as AttestationListPhase0),
+              ? SingleAttestationListTypeElectra.toJson(signedAttestations as SingleAttestation<ForkPostElectra>[])
+              : SingleAttestationListTypePhase0.toJson(signedAttestations as SingleAttestation<ForkPreElectra>[]),
             headers: {[MetaHeader.Version]: fork},
           };
         },
         parseReqJson: ({body, headers}) => {
           const fork = toForkName(fromHeaders(headers, MetaHeader.Version));
           return {
             signedAttestations: isForkPostElectra(fork)
-              ? AttestationListTypeElectra.fromJson(body)
-              : AttestationListTypePhase0.fromJson(body),
+              ? SingleAttestationListTypeElectra.fromJson(body)
+              : SingleAttestationListTypePhase0.fromJson(body),
           };
         },
         writeReqSsz: ({signedAttestations}) => {
           const fork = config.getForkName(signedAttestations[0]?.data.slot ?? 0);
           return {
             body: isForkPostElectra(fork)
-              ? AttestationListTypeElectra.serialize(signedAttestations as AttestationListElectra)
-              : AttestationListTypePhase0.serialize(signedAttestations as AttestationListPhase0),
+              ? SingleAttestationListTypeElectra.serialize(signedAttestations as SingleAttestation<ForkPostElectra>[])
+              : SingleAttestationListTypePhase0.serialize(signedAttestations as SingleAttestation<ForkPreElectra>[]),
             headers: {[MetaHeader.Version]: fork},
           };
         },
         parseReqSsz: ({body, headers}) => {
           const fork = toForkName(fromHeaders(headers, MetaHeader.Version));
           return {
             signedAttestations: isForkPostElectra(fork)
-              ? AttestationListTypeElectra.deserialize(body)
-              : AttestationListTypePhase0.deserialize(body),
+              ? SingleAttestationListTypeElectra.deserialize(body)
+              : SingleAttestationListTypePhase0.deserialize(body),
           };
         },
         schema: {

packages/api/src/beacon/routes/events.ts

@@ -14,6 +14,7 @@ import {
   UintNum64,
   altair,
   capella,
+  electra,
   phase0,
   ssz,
   sszTypesFor,
@@ -51,6 +52,8 @@ export enum EventType {
   block = "block",
   /** The node has received a valid attestation (from P2P or API) */
   attestation = "attestation",
+  /** The node has received a valid SingleAttestation (from P2P or API) */
+  singleAttestation = "single_attestation",
   /** The node has received a valid voluntary exit (from P2P or API) */
   voluntaryExit = "voluntary_exit",
   /** The node has received a valid proposer slashing (from P2P or API) */
@@ -79,6 +82,7 @@ export const eventTypes: {[K in EventType]: K} = {
   [EventType.head]: EventType.head,
   [EventType.block]: EventType.block,
   [EventType.attestation]: EventType.attestation,
+  [EventType.singleAttestation]: EventType.singleAttestation,
   [EventType.voluntaryExit]: EventType.voluntaryExit,
   [EventType.proposerSlashing]: EventType.proposerSlashing,
   [EventType.attesterSlashing]: EventType.attesterSlashing,
@@ -108,6 +112,7 @@ export type EventData = {
     executionOptimistic: boolean;
   };
   [EventType.attestation]: Attestation;
+  [EventType.singleAttestation]: electra.SingleAttestation;
   [EventType.voluntaryExit]: phase0.SignedVoluntaryExit;
   [EventType.proposerSlashing]: phase0.ProposerSlashing;
   [EventType.attesterSlashing]: AttesterSlashing;
@@ -237,6 +242,7 @@ export function getTypeByEvent(config: ChainForkConfig): {[K in EventType]: Type
         return sszTypesFor(fork).Attestation.fromJson(attestation);
       },
     },
+    [EventType.singleAttestation]: ssz.electra.SingleAttestation,
     [EventType.voluntaryExit]: ssz.phase0.SignedVoluntaryExit,
     [EventType.proposerSlashing]: ssz.phase0.ProposerSlashing,
     [EventType.attesterSlashing]: {

packages/api/test/unit/beacon/testData/events.ts

@@ -41,6 +41,19 @@ export const eventTestData: EventData = {
       target: {epoch: "1", root: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"},
     },
   }),
+  [EventType.singleAttestation]: ssz.electra.SingleAttestation.fromJson({
+    committee_index: "1",
+    attester_index: "1",
+    data: {
+      slot: "1",
+      index: "1",
+      beacon_block_root: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
+      source: {epoch: "1", root: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"},
+      target: {epoch: "1", root: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"},
+    },
+    signature:
+      "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505",
+  }),
   [EventType.voluntaryExit]: ssz.phase0.SignedVoluntaryExit.fromJson({
     message: {epoch: "1", validator_index: "1"},
     signature:

packages/beacon-node/src/api/impl/beacon/pool/index.ts

@@ -1,7 +1,13 @@
 import {routes} from "@lodestar/api";
 import {ApplicationMethods} from "@lodestar/api/server";
-import {ForkName, SYNC_COMMITTEE_SUBNET_SIZE, isForkPostElectra} from "@lodestar/params";
-import {Attestation, Epoch, isElectraAttestation, ssz} from "@lodestar/types";
+import {
+  ForkName,
+  ForkPostElectra,
+  ForkPreElectra,
+  SYNC_COMMITTEE_SUBNET_SIZE,
+  isForkPostElectra,
+} from "@lodestar/params";
+import {Attestation, Epoch, SingleAttestation, isElectraAttestation, ssz} from "@lodestar/types";
 import {
   AttestationError,
   AttestationErrorCode,
@@ -10,7 +16,7 @@ import {
 } from "../../../../chain/errors/index.js";
 import {validateApiAttesterSlashing} from "../../../../chain/validation/attesterSlashing.js";
 import {validateApiBlsToExecutionChange} from "../../../../chain/validation/blsToExecutionChange.js";
-import {validateApiAttestation} from "../../../../chain/validation/index.js";
+import {toElectraSingleAttestation, validateApiAttestation} from "../../../../chain/validation/index.js";
 import {validateApiProposerSlashing} from "../../../../chain/validation/proposerSlashing.js";
 import {validateApiSyncCommittee} from "../../../../chain/validation/syncCommittee.js";
 import {validateApiVoluntaryExit} from "../../../../chain/validation/voluntaryExit.js";
@@ -99,20 +105,35 @@ export function getBeaconPoolApi({
             // when a validator is configured with multiple beacon node urls, this attestation data may come from another beacon node
             // and the block hasn't been in our forkchoice since we haven't seen / processing that block
             // see https://github.com/ChainSafe/lodestar/issues/5098
-            const {indexedAttestation, subnet, attDataRootHex, committeeIndex} = await validateGossipFnRetryUnknownRoot(
-              validateFn,
-              network,
-              chain,
-              slot,
-              beaconBlockRoot
-            );
+            const {indexedAttestation, subnet, attDataRootHex, committeeIndex, aggregationBits, committeeBits} =
+              await validateGossipFnRetryUnknownRoot(validateFn, network, chain, slot, beaconBlockRoot);
 
             if (network.shouldAggregate(subnet, slot)) {
-              const insertOutcome = chain.attestationPool.add(committeeIndex, attestation, attDataRootHex);
+              const insertOutcome = chain.attestationPool.add(
+                committeeIndex,
+                attestation,
+                attDataRootHex,
+                aggregationBits,
+                committeeBits
+              );
               metrics?.opPool.attestationPoolInsertOutcome.inc({insertOutcome});
             }
 
-            chain.emitter.emit(routes.events.EventType.attestation, attestation);
+            if (isForkPostElectra(fork)) {
+              chain.emitter.emit(
+                routes.events.EventType.singleAttestation,
+                attestation as SingleAttestation<ForkPostElectra>
+              );
+            } else {
+              chain.emitter.emit(routes.events.EventType.attestation, attestation as SingleAttestation<ForkPreElectra>);
+              chain.emitter.emit(
+                routes.events.EventType.singleAttestation,
+                toElectraSingleAttestation(
+                  attestation as SingleAttestation<ForkPreElectra>,
+                  indexedAttestation.attestingIndices[0]
+                )
+              );
+            }
 
             const sentPeers = await network.publishBeaconAttestation(attestation, subnet);
             metrics?.onPoolSubmitUnaggregatedAttestation(seenTimestampSec, indexedAttestation, subnet, sentPeers);

packages/beacon-node/src/chain/errors/attestationError.ts

@@ -135,6 +135,10 @@ export enum AttestationErrorCode {
    * Electra: Invalid attestationData index: is non-zero
    */
   NON_ZERO_ATTESTATION_DATA_INDEX = "ATTESTATION_ERROR_NON_ZERO_ATTESTATION_DATA_INDEX",
+  /**
+   * Electra: Attester not in committee
+   */
+  ATTESTER_NOT_IN_COMMITTEE = "ATTESTATION_ERROR_ATTESTER_NOT_IN_COMMITTEE",
 }
 
 export type AttestationErrorType =
@@ -170,7 +174,8 @@ export type AttestationErrorType =
   | {code: AttestationErrorCode.INVALID_SERIALIZED_BYTES}
   | {code: AttestationErrorCode.TOO_MANY_SKIPPED_SLOTS; headBlockSlot: Slot; attestationSlot: Slot}
   | {code: AttestationErrorCode.NOT_EXACTLY_ONE_COMMITTEE_BIT_SET}
-  | {code: AttestationErrorCode.NON_ZERO_ATTESTATION_DATA_INDEX};
+  | {code: AttestationErrorCode.NON_ZERO_ATTESTATION_DATA_INDEX}
+  | {code: AttestationErrorCode.ATTESTER_NOT_IN_COMMITTEE};
 
 export class AttestationError extends GossipActionError<AttestationErrorType> {
   getMetadata(): Record<string, string | number | null> {

packages/beacon-node/src/chain/opPools/attestationPool.ts

@@ -2,7 +2,7 @@ import {Signature, aggregateSignatures} from "@chainsafe/blst";
 import {BitArray} from "@chainsafe/ssz";
 import {ChainForkConfig} from "@lodestar/config";
 import {isForkPostElectra} from "@lodestar/params";
-import {Attestation, RootHex, Slot, isElectraAttestation} from "@lodestar/types";
+import {Attestation, RootHex, SingleAttestation, Slot, isElectraSingleAttestation} from "@lodestar/types";
 import {assert, MapDef} from "@lodestar/utils";
 import {IClock} from "../../util/clock.js";
 import {InsertOutcome, OpPoolError, OpPoolErrorCode} from "./types.js";
@@ -105,7 +105,13 @@ export class AttestationPool {
    * - Valid committeeIndex
    * - Valid data
    */
-  add(committeeIndex: CommitteeIndex, attestation: Attestation, attDataRootHex: RootHex): InsertOutcome {
+  add(
+    committeeIndex: CommitteeIndex,
+    attestation: SingleAttestation,
+    attDataRootHex: RootHex,
+    aggregationBits: BitArray | null,
+    committeeBits: BitArray | null
+  ): InsertOutcome {
     const slot = attestation.data.slot;
     const fork = this.config.getForkName(slot);
     const lowestPermissibleSlot = this.lowestPermissibleSlot;
@@ -129,9 +135,9 @@ export class AttestationPool {
     if (isForkPostElectra(fork)) {
       // Electra only: this should not happen because attestation should be validated before reaching this
       assert.notNull(committeeIndex, "Committee index should not be null in attestation pool post-electra");
-      assert.true(isElectraAttestation(attestation), "Attestation should be type electra.Attestation");
+      assert.true(isElectraSingleAttestation(attestation), "Attestation should be type electra.SingleAttestation");
     } else {
-      assert.true(!isElectraAttestation(attestation), "Attestation should be type phase0.Attestation");
+      assert.true(!isElectraSingleAttestation(attestation), "Attestation should be type phase0.Attestation");
       committeeIndex = null; // For pre-electra, committee index info is encoded in attDataRootIndex
     }
 
@@ -144,10 +150,10 @@ export class AttestationPool {
     const aggregate = aggregateByIndex.get(committeeIndex);
     if (aggregate) {
       // Aggregate mutating
-      return aggregateAttestationInto(aggregate, attestation);
+      return aggregateAttestationInto(aggregate, attestation, aggregationBits);
     }
     // Create new aggregate
-    aggregateByIndex.set(committeeIndex, attestationToAggregate(attestation));
+    aggregateByIndex.set(committeeIndex, attestationToAggregate(attestation, aggregationBits, committeeBits));
     return InsertOutcome.NewData;
   }
 
@@ -216,8 +222,19 @@ export class AttestationPool {
 /**
  * Aggregate a new attestation into `aggregate` mutating it
  */
-function aggregateAttestationInto(aggregate: AggregateFast, attestation: Attestation): InsertOutcome {
-  const bitIndex = attestation.aggregationBits.getSingleTrueBit();
+function aggregateAttestationInto(
+  aggregate: AggregateFast,
+  attestation: SingleAttestation,
+  aggregationBits: BitArray | null
+): InsertOutcome {
+  let bitIndex: number | null;
+
+  if (isElectraSingleAttestation(attestation)) {
+    assert.notNull(aggregationBits, "aggregationBits missing post-electra");
+    bitIndex = aggregationBits.getSingleTrueBit();
+  } else {
+    bitIndex = attestation.aggregationBits.getSingleTrueBit();
+  }
 
   // Should never happen, attestations are verified against this exact condition before
   assert.notNull(bitIndex, "Invalid attestation in pool, not exactly one bit set");
@@ -234,13 +251,18 @@ function aggregateAttestationInto(aggregate: AggregateFast, attestation: Attesta
 /**
  * Format `contribution` into an efficient `aggregate` to add more contributions in with aggregateContributionInto()
  */
-function attestationToAggregate(attestation: Attestation): AggregateFast {
-  if (isElectraAttestation(attestation)) {
+function attestationToAggregate(
+  attestation: SingleAttestation,
+  aggregationBits: BitArray | null,
+  committeeBits: BitArray | null
+): AggregateFast {
+  if (isElectraSingleAttestation(attestation)) {
+    assert.notNull(aggregationBits, "aggregationBits missing post-electra to generate aggregate");
+    assert.notNull(committeeBits, "committeeBits missing post-electra to generate aggregate");
     return {
       data: attestation.data,
-      // clone because it will be mutated
-      aggregationBits: attestation.aggregationBits.clone(),
-      committeeBits: attestation.committeeBits,
+      aggregationBits,
+      committeeBits,
       signature: signatureFromBytesNoCheck(attestation.signature),
     };
   }