feat: add and support builder_boost_factor query param to produceBlockV3 api

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

@@ -13,6 +13,7 @@ import {
   Slot,
   ssz,
   UintNum64,
+  UintBn64,
   ValidatorIndex,
   RootHex,
   StringType,
@@ -53,6 +54,7 @@ export enum BuilderSelection {
 export type ExtraProduceBlockOps = {
   feeRecipient?: string;
   builderSelection?: BuilderSelection;
+  builderBoostFactor?: UintBn64;
   strictFeeRecipientCheck?: boolean;
   blindedLocal?: boolean;
 };
@@ -487,6 +489,7 @@ export type ReqTypes = {
       skip_randao_verification?: boolean;
       fee_recipient?: string;
       builder_selection?: string;
+      builder_boost_factor?: string;
       strict_fee_recipient_check?: boolean;
       blinded_local?: boolean;
     };
@@ -555,6 +558,7 @@ export function getReqSerializers(): ReqSerializers<Api, ReqTypes> {
         fee_recipient: opts?.feeRecipient,
         skip_randao_verification: skipRandaoVerification,
         builder_selection: opts?.builderSelection,
+        builder_boost_factor: opts?.builderBoostFactor?.toString(),
         strict_fee_recipient_check: opts?.strictFeeRecipientCheck,
         blinded_local: opts?.blindedLocal,
       },
@@ -567,6 +571,7 @@ export function getReqSerializers(): ReqSerializers<Api, ReqTypes> {
       {
         feeRecipient: query.fee_recipient,
         builderSelection: query.builder_selection as BuilderSelection,
+        builderBoostFactor: parseBuilderBoostFactor(query.builder_boost_factor),
         strictFeeRecipientCheck: query.strict_fee_recipient_check,
         blindedLocal: query.blinded_local,
       },
@@ -579,6 +584,7 @@ export function getReqSerializers(): ReqSerializers<Api, ReqTypes> {
         fee_recipient: Schema.String,
         skip_randao_verification: Schema.Boolean,
         builder_selection: Schema.String,
+        builder_boost_factor: Schema.String,
         strict_fee_recipient_check: Schema.Boolean,
         blinded_local: Schema.Boolean,
       },
@@ -785,3 +791,7 @@ export function getReturnTypes(): ReturnTypes<Api> {
     getLiveness: jsonType("snake"),
   };
 }
+
+function parseBuilderBoostFactor(builderBoostFactorInput?: string | number | bigint): bigint | undefined {
+  return builderBoostFactorInput !== undefined ? BigInt(builderBoostFactorInput) : undefined;
+}

packages/api/src/keymanager/routes.ts

@@ -247,6 +247,16 @@ export type Api = {
     >
   >;
 
+  updateBuilderBoostFactor(
+    pubkey: string,
+    builderBoostFactor: bigint
+  ): Promise<
+    ApiClientResponse<
+      {[HttpStatusCode.OK]: void; [HttpStatusCode.NO_CONTENT]: void},
+      HttpStatusCode.UNAUTHORIZED | HttpStatusCode.FORBIDDEN | HttpStatusCode.NOT_FOUND
+    >
+  >;
+
   /**
    * Create a signed voluntary exit message for an active validator, identified by a public key known to the validator
    * client. This endpoint returns a `SignedVoluntaryExit` object, which can be used to initiate voluntary exit via the
@@ -290,6 +300,8 @@ export const routesData: RoutesData<Api> = {
   setGasLimit: {url: "/eth/v1/validator/{pubkey}/gas_limit", method: "POST", statusOk: 202},
   deleteGasLimit: {url: "/eth/v1/validator/{pubkey}/gas_limit", method: "DELETE", statusOk: 204},
 
+  updateBuilderBoostFactor: {url: "/eth/v1/validator/{pubkey}/builder_boost_factor", method: "POST", statusOk: 202},
+
   signVoluntaryExit: {url: "/eth/v1/validator/{pubkey}/voluntary_exit", method: "POST"},
 };
 
@@ -326,6 +338,8 @@ export type ReqTypes = {
   setGasLimit: {params: {pubkey: string}; body: {gas_limit: string}};
   deleteGasLimit: {params: {pubkey: string}};
 
+  updateBuilderBoostFactor: {params: {pubkey: string}; body: {builder_boost_factor: string}};
+
   signVoluntaryExit: {params: {pubkey: string}; query: {epoch?: number}};
 };
 
@@ -423,6 +437,17 @@ export function getReqSerializers(): ReqSerializers<Api, ReqTypes> {
         params: {pubkey: Schema.StringRequired},
       },
     },
+    updateBuilderBoostFactor: {
+      writeReq: (pubkey, builderBoostFactor) => ({
+        params: {pubkey},
+        body: {builder_boost_factor: builderBoostFactor.toString(10)},
+      }),
+      parseReq: ({params: {pubkey}, body: {builder_boost_factor}}) => [pubkey, BigInt(builder_boost_factor)],
+      schema: {
+        params: {pubkey: Schema.StringRequired},
+        body: Schema.Object,
+      },
+    },
     signVoluntaryExit: {
       writeReq: (pubkey, epoch) => ({params: {pubkey}, query: epoch !== undefined ? {epoch} : {}}),
       parseReq: ({params: {pubkey}, query: {epoch}}) => [pubkey, epoch],

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

@@ -50,7 +50,13 @@ export const testData: GenericServerTestCases<Api> = {
       randaoReveal,
       graffiti,
       undefined,
-      {feeRecipient: undefined, builderSelection: undefined, strictFeeRecipientCheck: undefined},
+      {
+        feeRecipient,
+        builderSelection: undefined,
+        strictFeeRecipientCheck: undefined,
+        blindedLocal: undefined,
+        builderBoostFactor: 100n,
+      },
     ] as unknown as GenericServerTestCases<Api>["produceBlock"]["args"],
     res: {data: ssz.phase0.BeaconBlock.defaultValue()},
   },
@@ -60,7 +66,13 @@ export const testData: GenericServerTestCases<Api> = {
       randaoReveal,
       graffiti,
       undefined,
-      {feeRecipient: undefined, builderSelection: undefined, strictFeeRecipientCheck: undefined},
+      {
+        feeRecipient,
+        builderSelection: undefined,
+        strictFeeRecipientCheck: undefined,
+        blindedLocal: undefined,
+        builderBoostFactor: 100n,
+      },
     ] as unknown as GenericServerTestCases<Api>["produceBlockV2"]["args"],
     res: {
       data: ssz.altair.BeaconBlock.defaultValue(),
@@ -75,7 +87,13 @@ export const testData: GenericServerTestCases<Api> = {
       randaoReveal,
       graffiti,
       true,
-      {feeRecipient, builderSelection: undefined, strictFeeRecipientCheck: undefined},
+      {
+        feeRecipient,
+        builderSelection: undefined,
+        strictFeeRecipientCheck: undefined,
+        blindedLocal: undefined,
+        builderBoostFactor: 100n,
+      },
     ],
     res: {
       data: ssz.altair.BeaconBlock.defaultValue(),
@@ -92,7 +110,13 @@ export const testData: GenericServerTestCases<Api> = {
       randaoReveal,
       graffiti,
       undefined,
-      {feeRecipient: undefined, builderSelection: undefined, strictFeeRecipientCheck: undefined},
+      {
+        feeRecipient,
+        builderSelection: undefined,
+        strictFeeRecipientCheck: undefined,
+        blindedLocal: undefined,
+        builderBoostFactor: 100n,
+      },
     ] as unknown as GenericServerTestCases<Api>["produceBlindedBlock"]["args"],
     res: {
       data: ssz.bellatrix.BlindedBeaconBlock.defaultValue(),

packages/api/test/unit/keymanager/testData.ts

@@ -13,6 +13,7 @@ const pubkeyRand = "0x84105a985058fc8740a48bf1ede9d223ef09e8c6b1735ba0a55cf4a9ff
 const ethaddressRand = "0xabcf8e0d4e9587369b2301d0790347320302cc09";
 const graffitiRandUtf8 = "636861696e736166652f6c6f64657374";
 const gasLimitRand = 30_000_000;
+const builderBoostFactor = BigInt(100);
 
 export const testData: GenericServerTestCases<Api> = {
   listKeys: {
@@ -99,4 +100,8 @@ export const testData: GenericServerTestCases<Api> = {
     args: [pubkeyRand, 1],
     res: {data: ssz.phase0.SignedVoluntaryExit.defaultValue()},
   },
+  updateBuilderBoostFactor: {
+    args: [pubkeyRand, builderBoostFactor],
+    res: undefined,
+  },
 };

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

@@ -19,6 +19,7 @@ import {
   isForkExecution,
   ForkSeq,
 } from "@lodestar/params";
+import {MAX_BUILDER_BOOST_FACTOR} from "@lodestar/validator";
 import {
   Root,
   Slot,
@@ -423,7 +424,12 @@ export function getValidatorApi({
       graffiti,
       // TODO deneb: skip randao verification
       _skipRandaoVerification?: boolean,
-      {feeRecipient, builderSelection, strictFeeRecipientCheck}: routes.validator.ExtraProduceBlockOps = {}
+      {
+        feeRecipient,
+        builderSelection,
+        builderBoostFactor,
+        strictFeeRecipientCheck,
+      }: routes.validator.ExtraProduceBlockOps = {}
     ) {
       notWhileSyncing();
       await waitForSlot(slot); // Must never request for a future slot > currentSlot
@@ -436,18 +442,28 @@ export function getValidatorApi({
 
       const fork = config.getForkName(slot);
       // set some sensible opts
+      // builderSelection will be deprecated and will run in mode MaxProfit if builder is enabled
+      // and the actual selection will be determined using builderBoostFactor passed by the validator
       builderSelection = builderSelection ?? routes.validator.BuilderSelection.MaxProfit;
+      builderBoostFactor = builderBoostFactor ?? BigInt(100);
+      if (builderBoostFactor > MAX_BUILDER_BOOST_FACTOR) {
+        throw Error(`Invalid builderBoostFactor=${builderBoostFactor} > MAX_BUILDER_BOOST_FACTOR`);
+      }
+
       const isBuilderEnabled =
         ForkSeq[fork] >= ForkSeq.bellatrix &&
         chain.executionBuilder !== undefined &&
-        builderSelection !== routes.validator.BuilderSelection.ExecutionOnly;
+        builderSelection !== routes.validator.BuilderSelection.ExecutionOnly &&
+        builderBoostFactor !== BigInt(0);
 
       logger.verbose("Assembling block with produceEngineOrBuilderBlock ", {
         fork,
         builderSelection,
         slot,
         isBuilderEnabled,
         strictFeeRecipientCheck,
+        // winston logger doesn't like bigint
+        builderBoostFactor: `${builderBoostFactor}`,
       });
       // Start calls for building execution and builder blocks
       const blindedBlockPromise = isBuilderEnabled
@@ -541,7 +557,10 @@ export function getValidatorApi({
       if (fullBlock && blindedBlock) {
         switch (builderSelection) {
           case routes.validator.BuilderSelection.MaxProfit: {
-            if (blockValueEngine >= blockValueBuilder) {
+            if (
+              builderBoostFactor === MAX_BUILDER_BOOST_FACTOR ||
+              blockValueEngine >= (blockValueBuilder * builderBoostFactor) / BigInt(100)
+            ) {
               executionPayloadSource = ProducedBlockSource.engine;
             } else {
               executionPayloadSource = ProducedBlockSource.builder;
@@ -562,6 +581,7 @@ export function getValidatorApi({
         logger.verbose(`Selected executionPayloadSource=${executionPayloadSource} block`, {
           builderSelection,
           // winston logger doesn't like bigint
+          builderBoostFactor: `${builderBoostFactor}`,
           enginePayloadValue: `${enginePayloadValue}`,
           builderPayloadValue: `${builderPayloadValue}`,
           consensusBlockValueEngine: `${consensusBlockValueEngine}`,

packages/cli/src/cmds/validator/handler.ts

@@ -227,6 +227,7 @@ function getProposerConfigFromArgs(
       selection: parseBuilderSelection(
         args["builder.selection"] ?? (args["builder"] ? defaultOptions.builderAliasSelection : undefined)
       ),
+      boostFactor: args["builder.boostFactor"],
     },
   };
 

packages/cli/src/cmds/validator/keymanager/impl.ts

@@ -390,6 +390,15 @@ export class KeymanagerApi implements Api {
     };
   }
 
+  async updateBuilderBoostFactor(pubkeyHex: string, builderBoostFactor: bigint): Promise<void> {
+    this.checkIfProposerWriteEnabled();
+    this.validator.validatorStore.updateBuilderBoostFactor(pubkeyHex, builderBoostFactor);
+    this.persistedKeysBackend.writeProposerConfig(
+      pubkeyHex,
+      this.validator.validatorStore.getProposerConfig(pubkeyHex)
+    );
+  }
+
   /**
    * Create and sign a voluntary exit message for an active validator
    */

packages/cli/src/cmds/validator/options.ts

@@ -45,6 +45,7 @@ export type IValidatorCliArgs = AccountValidatorArgs &
 
     builder?: boolean;
     "builder.selection"?: string;
+    "builder.boostFactor"?: bigint;
 
     useProduceBlockV3?: boolean;
     broadcastValidation?: string;
@@ -246,6 +247,14 @@ export const validatorOptions: CliCommandOptions<IValidatorCliArgs> = {
     group: "builder",
   },
 
+  "builder.boostFactor": {
+    type: "number",
+    description:
+      "Percentage multiplier the block producing beacon node must apply to boost (>100) or dampen (<100) builder block value for selection against execution block. The multiplier is ignored if `--builder.selection` is set to anything other than `maxprofit`",
+    defaultDescription: `${defaultOptions.builderBoostFactor}`,
+    group: "builder",
+  },
+
   useProduceBlockV3: {
     type: "boolean",
     description: "Enable/disable usage of produceBlockV3 that might not be supported by all beacon clients yet",

packages/validator/src/index.ts

@@ -1,5 +1,5 @@
 export {Validator, type ValidatorOptions} from "./validator.js";
-export {ValidatorStore, SignerType, defaultOptions} from "./services/validatorStore.js";
+export {ValidatorStore, SignerType, defaultOptions, MAX_BUILDER_BOOST_FACTOR} from "./services/validatorStore.js";
 export type {
   Signer,
   SignerLocal,