ante

package
v0.4.4 Latest Latest
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 Go to latest Published: Jul 9, 2021 License: Apache-2.0 Imports: 18 Imported by: 0

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

Constants

This section is empty.

Variables

This section is empty.

Functions

func DefaultSigVerificationGasConsumer 

func DefaultSigVerificationGasConsumer(
	meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params,
) error

DefaultSigVerificationGasConsumer is the default implementation of SignatureVerificationGasConsumer. It consumes gas for signature verification based upon the public key type. The cost is fetched from the given params and is matched by the concrete type.

func NewAnteHandler 

func NewAnteHandler(
	ak AccountKeeper,
	bankKeeper BankKeeper,
	evmKeeper EVMKeeper,
	feeGrantKeeper authante.FeegrantKeeper,
	signModeHandler authsigning.SignModeHandler,
) 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.

func Recover 

func Recover(err *error)

Types

type AccessListDecorator 

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

AccessListDecorator prepare an access list for the sender if Yolov3/Berlin/EIPs 2929 and 2930 are applicable at the current block number.

func NewAccessListDecorator 

func NewAccessListDecorator(evmKeeper EVMKeeper) AccessListDecorator

NewAccessListDecorator creates a new AccessListDecorator.

func (AccessListDecorator) AnteHandle 

func (ald AccessListDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle handles the preparatory steps for executing an EVM state transition with regards to both EIP-2929 and EIP-2930:

  • Add sender to access list (2929)
  • Add destination to access list (2929)
  • Add precompiles to access list (2929)
  • Add the contents of the optional tx access list (2930)

The AnteHandler will only prepare the access list if Yolov3/Berlin/EIPs 2929 and 2930 are applicable at the current number.

type AccountKeeper 

type AccountKeeper interface {
	authante.AccountKeeper
	NewAccountWithAddress(ctx sdk.Context, addr sdk.AccAddress) authtypes.AccountI
	GetSequence(sdk.Context, sdk.AccAddress) (uint64, error)
}

AccountKeeper defines an expected keeper interface for the auth module's AccountKeeper

type BankKeeper 

type BankKeeper interface {
	authtypes.BankKeeper
	GetBalance(ctx sdk.Context, addr sdk.AccAddress, denom string) sdk.Coin
}

BankKeeper defines an expected keeper interface for the bank module's Keeper

type CanTransferDecorator 

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

CanTransferDecorator checks if the sender is allowed to transfer funds according to the EVM block context rules.

func NewCanTransferDecorator 

func NewCanTransferDecorator(evmKeeper EVMKeeper) CanTransferDecorator

NewCanTransferDecorator creates a new CanTransferDecorator instance.

func (CanTransferDecorator) AnteHandle 

func (ctd CanTransferDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle creates an EVM from the message and calls the BlockContext CanTransfer function to see if the address can execute the transaction.

type EVMKeeper 

type EVMKeeper interface {
	vm.StateDB

	ChainID() *big.Int
	GetParams(ctx sdk.Context) evmtypes.Params
	GetChainConfig(ctx sdk.Context) (evmtypes.ChainConfig, bool)
	WithContext(ctx sdk.Context)
	ResetRefundTransient(ctx sdk.Context)
	NewEVM(msg core.Message, config *params.ChainConfig) *vm.EVM
	GetCodeHash(addr common.Address) common.Hash
}

EVMKeeper defines the expected keeper interface used on the Eth AnteHandler

type EthAccountVerificationDecorator 

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

EthAccountVerificationDecorator validates an account balance checks

func NewEthAccountVerificationDecorator 

func NewEthAccountVerificationDecorator(ak AccountKeeper, bankKeeper BankKeeper, ek EVMKeeper) EthAccountVerificationDecorator

NewEthAccountVerificationDecorator creates a new EthAccountVerificationDecorator

func (EthAccountVerificationDecorator) AnteHandle 

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

AnteHandle validates checks that the sender balance is greater than the total transaction cost. The account will be set to store if it doesn't exis, i.e cannot be found on store. This AnteHandler decorator will fail if: - any of the msgs is not a MsgEthereumTx - from address is empty - account balance is lower than the transaction cost

type EthGasConsumeDecorator 

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

EthGasConsumeDecorator validates enough intrinsic gas for the transaction and gas consumption.

func NewEthGasConsumeDecorator 

func NewEthGasConsumeDecorator(ak AccountKeeper, bankKeeper BankKeeper, ek EVMKeeper) EthGasConsumeDecorator

NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator

func (EthGasConsumeDecorator) AnteHandle 

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

AnteHandle validates that the Ethereum tx message has enough to cover intrinsic gas (during CheckTx only) and that the sender has enough balance to pay for the gas cost.

Intrinsic gas for a transaction is the amount of gas that the transaction uses before the transaction is executed. The gas is a constant value plus any cost inccured by additional bytes of data supplied with the transaction.

This AnteHandler decorator will fail if: - the transaction contains more than one message - the message is not a MsgEthereumTx - sender account cannot be found - transaction's gas limit is lower than the intrinsic gas - user doesn't have enough balance to deduct the transaction fees (gas_limit * gas_price) - transaction or block gas meter runs out of gas

type EthIncrementSenderSequenceDecorator 

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

EthIncrementSenderSequenceDecorator increments the sequence of the signers.

func NewEthIncrementSenderSequenceDecorator 

func NewEthIncrementSenderSequenceDecorator(ak AccountKeeper) EthIncrementSenderSequenceDecorator

NewEthIncrementSenderSequenceDecorator creates a new EthIncrementSenderSequenceDecorator.

func (EthIncrementSenderSequenceDecorator) AnteHandle 

func (issd EthIncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle handles incrementing the sequence of the signer (i.e sender). If the transaction is a contract creation, the nonce will be incremented during the transaction execution and not within this AnteHandler decorator.

type EthNonceVerificationDecorator 

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

EthNonceVerificationDecorator checks that the account nonce from the transaction matches the sender account sequence.

func NewEthNonceVerificationDecorator 

func NewEthNonceVerificationDecorator(ak AccountKeeper) EthNonceVerificationDecorator

NewEthNonceVerificationDecorator creates a new EthNonceVerificationDecorator

func (EthNonceVerificationDecorator) AnteHandle 

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

AnteHandle validates that the transaction nonces are valid and equivalent to the sender account’s current nonce.

type EthSetupContextDecorator 

type EthSetupContextDecorator struct{}

EthSetupContextDecorator is adapted from SetUpContextDecorator from cosmos-sdk, it ignores gas consumption by setting the gas meter to infinite

func NewEthSetUpContextDecorator 

func NewEthSetUpContextDecorator() EthSetupContextDecorator

func (EthSetupContextDecorator) AnteHandle 

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

type EthSigVerificationDecorator 

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

EthSigVerificationDecorator validates an ethereum signatures

func NewEthSigVerificationDecorator 

func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator

NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator

func (EthSigVerificationDecorator) AnteHandle 

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

AnteHandle validates checks that the registered chain id is the same as the one on the message, and that the signer address matches the one defined on the message. It's not skipped for RecheckTx, because it set `From` address which is critical from other ante handler to work. Failure in RecheckTx will prevent tx to be included into block, especially when CheckTx succeed, in which case user won't see the error message.

type EthValidateBasicDecorator 

type EthValidateBasicDecorator struct{}

EthValidateBasicDecorator is adapted from ValidateBasicDecorator from cosmos-sdk, it ignores ErrNoSignatures

func NewEthValidateBasicDecorator 

func NewEthValidateBasicDecorator() EthValidateBasicDecorator

NewEthValidateBasicDecorator creates a new EthValidateBasicDecorator

func (EthValidateBasicDecorator) AnteHandle 

func (vbd EthValidateBasicDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error)

AnteHandle handles basic validation of tx

Source Files

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