chore(val): reject proposals not for the current or next slot (#10450)

yarn-project/epoch-cache/src/epoch_cache.test.ts

@@ -88,18 +88,18 @@ describe('EpochCache', () => {
     // Hence the chosen values for testCommittee below
 
     // Get validator for slot 0
-    let [currentValidator] = await epochCache.getProposerInCurrentOrNextSlot();
-    expect(currentValidator).toEqual(testCommittee[1]);
+    const { currentProposer } = await epochCache.getProposerInCurrentOrNextSlot();
+    expect(currentProposer).toEqual(testCommittee[1]);
 
     // Move to next slot
     jest.setSystemTime(initialTime + Number(SLOT_DURATION) * 1000);
-    [currentValidator] = await epochCache.getProposerInCurrentOrNextSlot();
-    expect(currentValidator).toEqual(testCommittee[1]);
+    const { currentProposer: nextProposer } = await epochCache.getProposerInCurrentOrNextSlot();
+    expect(nextProposer).toEqual(testCommittee[1]);
 
     // Move to slot that wraps around validator set
     jest.setSystemTime(initialTime + Number(SLOT_DURATION) * 3 * 1000);
-    [currentValidator] = await epochCache.getProposerInCurrentOrNextSlot();
-    expect(currentValidator).toEqual(testCommittee[0]);
+    const { currentProposer: nextNextProposer } = await epochCache.getProposerInCurrentOrNextSlot();
+    expect(nextNextProposer).toEqual(testCommittee[0]);
   });
 
   it('Should request to update the validator set when on the epoch boundary', async () => {

yarn-project/epoch-cache/src/epoch_cache.ts

@@ -151,7 +151,12 @@ export class EpochCache {
    * If we are at an epoch boundary, then we can update the cache for the next epoch, this is the last check
    * we do in the validator client, so we can update the cache here.
    */
-  async getProposerInCurrentOrNextSlot(): Promise<[EthAddress, EthAddress]> {
+  async getProposerInCurrentOrNextSlot(): Promise<{
+    currentProposer: EthAddress;
+    nextProposer: EthAddress;
+    currentSlot: bigint;
+    nextSlot: bigint;
+  }> {
     // Validators are sorted by their index in the committee, and getValidatorSet will cache
     const committee = await this.getCommittee();
     const { slot: currentSlot, epoch: currentEpoch } = this.getEpochAndSlotNow();
@@ -176,10 +181,10 @@ export class EpochCache {
       BigInt(committee.length),
     );
 
-    const calculatedProposer = committee[Number(proposerIndex)];
-    const nextCalculatedProposer = committee[Number(nextProposerIndex)];
+    const currentProposer = committee[Number(proposerIndex)];
+    const nextProposer = committee[Number(nextProposerIndex)];
 
-    return [calculatedProposer, nextCalculatedProposer];
+    return { currentProposer, nextProposer, currentSlot, nextSlot };
   }
 
   /**

yarn-project/validator-client/src/validator.test.ts

@@ -101,7 +101,12 @@ describe('ValidationService', () => {
     // mock the p2pClient.getTxStatus to return undefined for all transactions
     p2pClient.getTxStatus.mockImplementation(() => undefined);
     epochCache.getProposerInCurrentOrNextSlot.mockImplementation(() =>
-      Promise.resolve([proposal.getSender(), proposal.getSender()]),
+      Promise.resolve({
+        currentProposer: proposal.getSender(),
+        nextProposer: proposal.getSender(),
+        currentSlot: proposal.slotNumber.toBigInt(),
+        nextSlot: proposal.slotNumber.toBigInt() + 1n,
+      }),
     );
     epochCache.isInCommittee.mockImplementation(() => Promise.resolve(true));
 
@@ -119,7 +124,12 @@ describe('ValidationService', () => {
 
     // Setup epoch cache mocks
     epochCache.getProposerInCurrentOrNextSlot.mockImplementation(() =>
-      Promise.resolve([proposal.getSender(), proposal.getSender()]),
+      Promise.resolve({
+        currentProposer: proposal.getSender(),
+        nextProposer: proposal.getSender(),
+        currentSlot: proposal.slotNumber.toBigInt(),
+        nextSlot: proposal.slotNumber.toBigInt() + 1n,
+      }),
     );
     epochCache.isInCommittee.mockImplementation(() => Promise.resolve(false));
 
@@ -132,7 +142,30 @@ describe('ValidationService', () => {
 
     // Setup epoch cache mocks
     epochCache.getProposerInCurrentOrNextSlot.mockImplementation(() =>
-      Promise.resolve([EthAddress.random(), EthAddress.random()]),
+      Promise.resolve({
+        currentProposer: EthAddress.random(),
+        nextProposer: EthAddress.random(),
+        currentSlot: proposal.slotNumber.toBigInt(),
+        nextSlot: proposal.slotNumber.toBigInt() + 1n,
+      }),
+    );
+    epochCache.isInCommittee.mockImplementation(() => Promise.resolve(true));
+
+    const attestation = await validatorClient.attestToProposal(proposal);
+    expect(attestation).toBeUndefined();
+  });
+
+  it('Should not return an attestation if the proposal is not for the current or next slot', async () => {
+    const proposal = makeBlockProposal();
+
+    // Setup epoch cache mocks
+    epochCache.getProposerInCurrentOrNextSlot.mockImplementation(() =>
+      Promise.resolve({
+        currentProposer: proposal.getSender(),
+        nextProposer: proposal.getSender(),
+        currentSlot: proposal.slotNumber.toBigInt() + 20n,
+        nextSlot: proposal.slotNumber.toBigInt() + 21n,
+      }),
     );
     epochCache.isInCommittee.mockImplementation(() => Promise.resolve(true));
 

yarn-project/validator-client/src/validator.ts

@@ -134,12 +134,21 @@ export class ValidatorClient extends WithTracer implements Validator {
     }
 
     // Check that the proposal is from the current proposer, or the next proposer.
-    const [currentProposer, nextSlotProposer] = await this.epochCache.getProposerInCurrentOrNextSlot();
-    if (!proposal.getSender().equals(currentProposer) && !proposal.getSender().equals(nextSlotProposer)) {
+    const proposalSender = proposal.getSender();
+    const { currentProposer, nextProposer, currentSlot, nextSlot } =
+      await this.epochCache.getProposerInCurrentOrNextSlot();
+    if (!proposalSender.equals(currentProposer) && !proposalSender.equals(nextProposer)) {
       this.log.verbose(`Not the current or next proposer, skipping attestation`);
       return undefined;
     }
 
+    // Check that the proposal is for the current or next slot
+    const slotNumberBigInt = proposal.slotNumber.toBigInt();
+    if (slotNumberBigInt !== currentSlot && slotNumberBigInt !== nextSlot) {
+      this.log.verbose(`Not the current or next slot, skipping attestation`);
+      return undefined;
+    }
+
     // Check that all of the tranasctions in the proposal are available in the tx pool before attesting
     this.log.verbose(`request to attest`, {
       archive: proposal.payload.archive.toString(),