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| Original file line number | Diff line number | Diff line change |
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| import "@account-abstraction/contracts/core/EntryPointSimulations.sol"; |
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| Original file line number | Diff line number | Diff line change |
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| import { DeployFunction } from 'hardhat-deploy/types' | ||
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| const deploy: DeployFunction = async ({ deployments, getNamedAccounts, network }) => { | ||
| if (!network.tags.test) { | ||
| return | ||
| } | ||
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| const { deployer } = await getNamedAccounts() | ||
| const { deploy } = deployments | ||
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| await deploy('EntryPointSimulations', { | ||
| from: deployer, | ||
| args: [], | ||
| log: true, | ||
| deterministicDeployment: true, | ||
| }) | ||
| } | ||
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| export default deploy |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,184 @@ | ||
| import { ethers } from 'ethers' | ||
| import { HardhatEthersProvider } from '@nomicfoundation/hardhat-ethers/internal/hardhat-ethers-provider' | ||
| import { buildPackedUserOperationFromSafeUserOperation, PLACEHOLDER_SIGNATURE, SafeUserOperation } from '../../src/utils/userOp' | ||
| import { EntryPointSimulations } from '../../typechain-types' | ||
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| export interface GasOverheads { | ||
| /** | ||
| * fixed overhead for entire handleOp bundle. | ||
| */ | ||
| fixed: number | ||
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| /** | ||
| * per userOp overhead, added on top of the above fixed per-bundle. | ||
| */ | ||
| perUserOp: number | ||
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| /** | ||
| * overhead for userOp word (32 bytes) block | ||
| */ | ||
| perUserOpWord: number | ||
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| // perCallDataWord: number | ||
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| /** | ||
| * zero byte cost, for calldata gas cost calculations | ||
| */ | ||
| zeroByte: number | ||
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| /** | ||
| * non-zero byte cost, for calldata gas cost calculations | ||
| */ | ||
| nonZeroByte: number | ||
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| /** | ||
| * expected bundle size, to split per-bundle overhead between all ops. | ||
| */ | ||
| bundleSize: number | ||
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| /** | ||
| * expected length of the userOp signature. | ||
| */ | ||
| sigSize: number | ||
| } | ||
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| /** | ||
| * calculate the preVerificationGas of the given UserOperation | ||
| * preVerificationGas (by definition) is the cost overhead that can't be calculated on-chain. | ||
| * it is based on parameters that are defined by the Ethereum protocol for external transactions. | ||
| * @param userOp filled userOp to calculate. The only possible missing fields can be the signature and preVerificationGas itself | ||
| * @param overheads gas overheads to use, to override the default values | ||
| */ | ||
| export const calcPreVerificationGas = (userOp: SafeUserOperation): number => { | ||
| const gasOverheads: GasOverheads = { | ||
| fixed: 21000, | ||
| perUserOp: 18300, | ||
| perUserOpWord: 4, | ||
| zeroByte: 4, | ||
| nonZeroByte: 16, | ||
| bundleSize: 1, | ||
| sigSize: 65, | ||
| } | ||
| const op: SafeUserOperation = { | ||
| // dummy values, in case the UserOp is incomplete. | ||
| ...userOp, | ||
| preVerificationGas: 21000, // dummy value, just for calldata cost | ||
| } | ||
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| const packed = buildPackedUserOperationFromSafeUserOperation({ safeOp: op, signature: PLACEHOLDER_SIGNATURE }) | ||
| const encoded = ethers.toBeArray( | ||
| ethers.AbiCoder.defaultAbiCoder().encode( | ||
| ['address', 'uint256', 'bytes', 'bytes', 'bytes32', 'uint256', 'bytes32', 'bytes', 'bytes'], | ||
| [ | ||
| packed.sender, | ||
| packed.nonce, | ||
| packed.initCode, | ||
| packed.callData, | ||
| packed.accountGasLimits, | ||
| packed.preVerificationGas, | ||
| packed.gasFees, | ||
| packed.paymasterAndData, | ||
| packed.signature, | ||
| ], | ||
| ), | ||
| ) | ||
| const lengthInWord = (encoded.length + 31) / 32 | ||
| const callDataCost = encoded.map((x) => (x === 0 ? gasOverheads.zeroByte : gasOverheads.nonZeroByte)).reduce((sum, x) => sum + x) | ||
| const ret = Math.round( | ||
| callDataCost + gasOverheads.fixed / gasOverheads.bundleSize + gasOverheads.perUserOp + gasOverheads.perUserOpWord * lengthInWord, | ||
| ) | ||
| return ret | ||
| } | ||
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| export interface EstimateUserOpGasResult { | ||
| /** | ||
| * the preVerification gas used by this UserOperation. | ||
| */ | ||
| preVerificationGas: bigint | ||
| /** | ||
| * gas used for validation of this UserOperation, including account creation | ||
| */ | ||
| verificationGasLimit: bigint | ||
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| /** | ||
| * (possibly future timestamp) after which this UserOperation is valid | ||
| */ | ||
| validAfter?: bigint | ||
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| /** | ||
| * the deadline after which this UserOperation is invalid (not a gas estimation parameter, but returned by validation | ||
| */ | ||
| validUntil?: bigint | ||
| /** | ||
| * estimated cost of calling the account with the given callData | ||
| */ | ||
| callGasLimit: bigint | ||
| } | ||
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| export type ExecutionResultStructOutput = [ | ||
| preOpGas: ethers.BigNumberish, | ||
| paid: ethers.BigNumberish, | ||
| accountValidationData: ethers.BigNumberish, | ||
| paymasterValidationData: ethers.BigNumberish, | ||
| targetSuccess: boolean, | ||
| targetResult: string, | ||
| ] & { | ||
| preOpGas: ethers.BigNumberish | ||
| paid: ethers.BigNumberish | ||
| accountValidationData: ethers.BigNumberish | ||
| paymasterValidationData: ethers.BigNumberish | ||
| targetSuccess: boolean | ||
| targetResult: string | ||
| } | ||
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| export const calcVerificationGasAndCallGasLimit = (userOperation: SafeUserOperation, executionResult: ExecutionResultStructOutput) => { | ||
| const verificationGasLimit = ((BigInt(executionResult.preOpGas) - BigInt(userOperation.preVerificationGas)) * 3n) / 2n | ||
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| const gasPrice = BigInt(userOperation.maxFeePerGas) | ||
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| const calculatedCallGasLimit = BigInt(executionResult.paid) / gasPrice - BigInt(executionResult.preOpGas) | ||
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| const callGasLimit = (calculatedCallGasLimit > 9000n ? calculatedCallGasLimit : 9000n) + 21000n + 50000n | ||
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| return { verificationGasLimit, callGasLimit } | ||
| } | ||
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| export const estimateUserOperationGas = async ( | ||
| provider: HardhatEthersProvider, | ||
| entryPointSimulations: EntryPointSimulations, | ||
| safeOp: SafeUserOperation, | ||
| entryPointAddress: string, | ||
| // ): Promise<EstimateUserOpGasResult> => { | ||
| ) => { | ||
| const packedUserOp = buildPackedUserOperationFromSafeUserOperation({ safeOp, signature: PLACEHOLDER_SIGNATURE }) | ||
| const encodedSimulateHandleOp = entryPointSimulations.interface.encodeFunctionData('simulateHandleOp', [ | ||
| packedUserOp, | ||
| ethers.ZeroAddress, | ||
| '0x', | ||
| ]) | ||
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| const simulationData = await provider.send('eth_call', [ | ||
| { | ||
| to: entryPointAddress, | ||
| data: encodedSimulateHandleOp, | ||
| }, | ||
| 'latest', | ||
| { | ||
| [entryPointAddress]: { | ||
| code: await entryPointSimulations.getDeployedCode(), | ||
| }, | ||
| }, | ||
| ]) | ||
| const executionResultStruct = entryPointSimulations.interface.decodeFunctionResult( | ||
| 'simulateHandleOp', | ||
| simulationData, | ||
| )[0] as unknown as ExecutionResultStructOutput | ||
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| console.log({ executionResultStruct }) | ||
| const { verificationGasLimit, callGasLimit } = calcVerificationGasAndCallGasLimit(safeOp, executionResultStruct) | ||
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| return { | ||
| callGasLimit, | ||
| verificationGasLimit, | ||
| } | ||
| } |
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