ante

Documentation

Overview

Package ante defines the SDK auth module's AnteHandler as well as an internal AnteHandler for an Ethereum transaction (i.e MsgEthereumTx).

During CheckTx, the transaction is passed through a series of pre-message execution validation checks such as signature and account verification in addition to minimum fees being checked. Otherwise, during DeliverTx, the transaction is simply passed to the EVM which will also perform the same series of checks. The distinction is made in CheckTx to prevent spam and DoS attacks.

Index

• func NewAnteHandler(options HandlerOptions) sdk.AnteHandler
• type EvmKeeper
• type HandlerOptions
  • func (options HandlerOptions) Validate() error
• type ValidatorCommissionDecorator
  • func NewValidatorCommissionDecorator(cdc codec.BinaryCodec) ValidatorCommissionDecorator
  • func (vcd ValidatorCommissionDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

Functions

func NewAnteHandler

func NewAnteHandler(options HandlerOptions) sdk.AnteHandler

NewAnteHandler returns an ante handler responsible for attempting to route an Ethereum or SDK transaction to an internal ante handler for performing transaction-level processing (e.g. fee payment, signature verification) before being passed onto it's respective handler.

Types

type EvmKeeper

type EvmKeeper interface {
	GetParams(ctx sdk.Context) (params evmtypes.Params)
	ChainID() *big.Int
	GetBaseFee(ctx sdk.Context, ethCfg *params.ChainConfig) *big.Int
}

EvmKeeper defines the expected keeper interface used on the AnteHandler

type HandlerOptions

type HandlerOptions struct {
	AccountKeeper     evmtypes.AccountKeeper
	BankKeeper        evmtypes.BankKeeper
	FeeMarketKeeper   ethante.FeeMarketKeeper
	EvmKeeper         ethante.EVMKeeper
	FeegrantKeeper    ante.FeegrantKeeper
	SignModeHandler   authsigning.SignModeHandler
	SigGasConsumer    func(meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params) error
	TxCounterStoreKey storetypes.StoreKey
	Cdc               codec.BinaryCodec
	MaxTxGasWanted    uint64
	TxFeeChecker      ante.TxFeeChecker
}

HandlerOptions defines the list of module keepers required to run the Evmos AnteHandler decorators.

func (HandlerOptions) Validate

func (options HandlerOptions) Validate() error

Validate checks if the keepers are defined

type ValidatorCommissionDecorator

type ValidatorCommissionDecorator struct {
	// contains filtered or unexported fields
}

ValidatorCommissionDecorator validates that the validator commission is always greater or equal than the min commission rate

func NewValidatorCommissionDecorator

func NewValidatorCommissionDecorator(cdc codec.BinaryCodec) ValidatorCommissionDecorator

NewValidatorCommissionDecorator creates a new NewValidatorCommissionDecorator

func (ValidatorCommissionDecorator) AnteHandle

func (vcd ValidatorCommissionDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error)

AnteHandle checks if the tx contains a staking create validator or edit validator. It errors if the the commission rate is below the min threshold.