core/vm: implement eip-7843

beacon/engine/types.go

@@ -51,6 +51,12 @@ var (
 	// ExecutionPayloadV3 has the syntax of ExecutionPayloadV2 and appends the new
 	// fields: blobGasUsed and excessBlobGas.
 	PayloadV3 PayloadVersion = 0x3
+
+	// PayloadV4 is the identifier of ExecutionPayloadV3 introduced in amsterdam fork.
+	//
+	// https://github.com/ethereum/execution-apis/blob/main/src/engine/amsterdam.md#executionpayloadv4
+	// ExecutionPayloadV3 has the syntax of ExecutionPayloadV3 and appends the new
+	// field slotNumber.
 	PayloadV4 PayloadVersion = 0x4
 )
 
@@ -64,11 +70,13 @@ type PayloadAttributes struct {
 	SuggestedFeeRecipient common.Address      `json:"suggestedFeeRecipient" gencodec:"required"`
 	Withdrawals           []*types.Withdrawal `json:"withdrawals"`
 	BeaconRoot            *common.Hash        `json:"parentBeaconBlockRoot"`
+	SlotNumber            *uint64             `json:"slotNumber"`
 }
 
 // JSON type overrides for PayloadAttributes.
 type payloadAttributesMarshaling struct {
-	Timestamp hexutil.Uint64
+	Timestamp  hexutil.Uint64
+	SlotNumber *hexutil.Uint64
 }
 
 //go:generate go run github.com/fjl/gencodec -type ExecutableData -field-override executableDataMarshaling -out gen_ed.go

eth/catalyst/api.go

@@ -213,6 +213,28 @@ func (api *ConsensusAPI) ForkchoiceUpdatedV3(update engine.ForkchoiceStateV1, pa
 	return api.forkchoiceUpdated(update, params, engine.PayloadV3, false)
 }
 
+// ForkchoiceUpdatedV4 is equivalent to V3 with the addition of slot number
+// in the payload attributes. It supports only PayloadAttributesV4.
+func (api *ConsensusAPI) ForkchoiceUpdatedV4(update engine.ForkchoiceStateV1, params *engine.PayloadAttributes) (engine.ForkChoiceResponse, error) {
+	if params != nil {
+		switch {
+		case params.Withdrawals == nil:
+			return engine.STATUS_INVALID, attributesErr("missing withdrawals")
+		case params.BeaconRoot == nil:
+			return engine.STATUS_INVALID, attributesErr("missing beacon root")
+		case params.SlotNumber == nil:
+			return engine.STATUS_INVALID, attributesErr("missing slot number")
+		case !api.checkFork(params.Timestamp, forks.Amsterdam):
+			return engine.STATUS_INVALID, unsupportedForkErr("fcuV4 must only be called for amsterdam payloads")
+		}
+	}
+	// TODO(matt): the spec requires that fcu is applied when called on a valid
+	// hash, even if params are wrong. To do this we need to split up
+	// forkchoiceUpdate into a function that only updates the head and then a
+	// function that kicks off block construction.
+	return api.forkchoiceUpdated(update, params, engine.PayloadV4, false)
+}
+
 func (api *ConsensusAPI) forkchoiceUpdated(update engine.ForkchoiceStateV1, payloadAttributes *engine.PayloadAttributes, payloadVersion engine.PayloadVersion, payloadWitness bool) (engine.ForkChoiceResponse, error) {
 	api.forkchoiceLock.Lock()
 	defer api.forkchoiceLock.Unlock()
@@ -346,6 +368,7 @@ func (api *ConsensusAPI) forkchoiceUpdated(update engine.ForkchoiceStateV1, payl
 			Random:       payloadAttributes.Random,
 			Withdrawals:  payloadAttributes.Withdrawals,
 			BeaconRoot:   payloadAttributes.BeaconRoot,
+			SlotNum:      payloadAttributes.SlotNumber,
 			Version:      payloadVersion,
 		}
 		id := args.Id()
@@ -459,15 +482,16 @@ func (api *ConsensusAPI) GetPayloadV5(payloadID engine.PayloadID) (*engine.Execu
 		})
 }
 
-// GetPayloadV6 returns a cached payload by id.
+// GetPayloadV6 returns a cached payload by id. This endpoint should only
+// be used after the Amsterdam fork.
 func (api *ConsensusAPI) GetPayloadV6(payloadID engine.PayloadID) (*engine.ExecutionPayloadEnvelope, error) {
-	if !payloadID.Is(engine.PayloadV4) {
-		return nil, engine.UnsupportedFork
-	}
-	return api.getPayload(payloadID,
+	return api.getPayload(
+		payloadID,
 		false,
 		[]engine.PayloadVersion{engine.PayloadV4},
-		nil)
+		[]forks.Fork{
+			forks.Amsterdam,
+		})
 }
 
 // getPayload will retrieve the specified payload and verify it conforms to the
@@ -728,9 +752,12 @@ func (api *ConsensusAPI) NewPayloadV5(params engine.ExecutableData, versionedHas
 		return invalidStatus, paramsErr("nil beaconRoot post-cancun")
 	case executionRequests == nil:
 		return invalidStatus, paramsErr("nil executionRequests post-prague")
+	case !api.checkFork(params.Timestamp, forks.Prague, forks.Osaka, forks.Amsterdam):
 	case params.BlockAccessList == nil:
 		return invalidStatus, paramsErr("nil block access list post-amsterdam")
-	case !api.checkFork(params.Timestamp, forks.Prague, forks.Osaka, forks.Amsterdam):
+	case params.SlotNumber == nil:
+		return invalidStatus, paramsErr("nil slotnumber post-amsterdam")
+	case !api.checkFork(params.Timestamp, forks.Amsterdam):
 		return invalidStatus, unsupportedForkErr("newPayloadV5 must only be called for amsterdam payloads")
 	}
 	requests := convertRequests(executionRequests)
@@ -768,6 +795,10 @@ func (api *ConsensusAPI) newPayload(params engine.ExecutableData, versionedHashe
 		if params.ExcessBlobGas != nil {
 			ebg = strconv.Itoa(int(*params.ExcessBlobGas))
 		}
+		slotnum := "nil"
+		if params.SlotNumber != nil {
+			ebg = strconv.Itoa(int(*params.SlotNumber))
+		}
 		log.Warn("Invalid NewPayload params",
 			"params.Number", params.Number,
 			"params.ParentHash", params.ParentHash,
@@ -783,6 +814,7 @@ func (api *ConsensusAPI) newPayload(params engine.ExecutableData, versionedHashe
 			"params.BaseFeePerGas", params.BaseFeePerGas,
 			"params.BlobGasUsed", bgu,
 			"params.ExcessBlobGas", ebg,
+			"params.SlotNumber", slotnum,
 			"len(params.Transactions)", len(params.Transactions),
 			"len(params.Withdrawals)", len(params.Withdrawals),
 			"beaconRoot", beaconRoot,

miner/payload_building.go

@@ -43,6 +43,7 @@ type BuildPayloadArgs struct {
 	Random       common.Hash           // The provided randomness value
 	Withdrawals  types.Withdrawals     // The provided withdrawals
 	BeaconRoot   *common.Hash          // The provided beaconRoot (Cancun)
+	SlotNum      *uint64               // The provided slotNumber
 	Version      engine.PayloadVersion // Versioning byte for payload id calculation.
 }
 
@@ -57,6 +58,9 @@ func (args *BuildPayloadArgs) Id() engine.PayloadID {
 	if args.BeaconRoot != nil {
 		hasher.Write(args.BeaconRoot[:])
 	}
+	if args.SlotNum != nil {
+		binary.Write(hasher, binary.BigEndian, args.SlotNum)
+	}
 	var out engine.PayloadID
 	copy(out[:], hasher.Sum(nil)[:8])
 	out[0] = byte(args.Version)
@@ -218,6 +222,7 @@ func (miner *Miner) buildPayload(args *BuildPayloadArgs, witness bool) (*Payload
 		random:      args.Random,
 		withdrawals: args.Withdrawals,
 		beaconRoot:  args.BeaconRoot,
+		slotNum:     args.SlotNum,
 		noTxs:       true,
 	}
 	empty := miner.generateWork(emptyParams, witness)
@@ -248,6 +253,7 @@ func (miner *Miner) buildPayload(args *BuildPayloadArgs, witness bool) (*Payload
 			random:      args.Random,
 			withdrawals: args.Withdrawals,
 			beaconRoot:  args.BeaconRoot,
+			slotNum:     args.SlotNum,
 			noTxs:       false,
 		}
 

miner/worker.go

@@ -113,6 +113,7 @@ type generateParams struct {
 	random      common.Hash       // The randomness generated by beacon chain, empty before the merge
 	withdrawals types.Withdrawals // List of withdrawals to include in block (shanghai field)
 	beaconRoot  *common.Hash      // The beacon root (cancun field).
+	slotNum     *uint64           // The slot number (amsterdam field).
 	noTxs       bool              // Flag whether an empty block without any transaction is expected
 }
 
@@ -271,6 +272,13 @@ func (miner *Miner) prepareWork(genParams *generateParams, witness bool) (*envir
 		header.ExcessBlobGas = &excessBlobGas
 		header.ParentBeaconRoot = genParams.beaconRoot
 	}
+	// Apply EIP-7843.
+	if miner.chainConfig.IsAmsterdam(header.Number, header.Time) {
+		if genParams.slotNum == nil {
+			return nil, errors.New("no slot number set post-amsterdam")
+		}
+		header.SlotNumber = genParams.slotNum
+	}
 	// Could potentially happen if starting to mine in an odd state.
 	// Note genParams.coinbase can be different with header.Coinbase
 	// since clique algorithm can modify the coinbase field in header.