evm

Documentation

Index

• Constants
• type AppModule
  • func NewAppModule(k *keeper.Keeper, ak types.AccountKeeper, bankKeeper types.BankKeeper, ...) AppModule
  • func (am AppModule) RegisterServices(cfg module.Configurator)
• type Keeper
  • func (k *Keeper) ApplyTransaction(ctx sdk.Context, tx *ethtypes.Transaction, feePayerAddr string) (*types.MsgEthereumTxResponse, error)
  • func (k *Keeper) EthereumTx(goCtx context.Context, msg *types.MsgEthereumTx) (*types.MsgEthereumTxResponse, error)
  • func (k *Keeper) RefundGas(ctx sdk.Context, msg core.Message, leftoverGas uint64, feePayer string, ...) error
  • func (k *Keeper) UpdateParams(goCtx context.Context, msg *types.MsgUpdateParams) (*types.MsgUpdateParamsResponse, error)

Constants

const (
	EventEIP1559Burnt = "eip1559_burnt"

	AttributeKeyBaseFee  = "base_fee"
	AttributeKeyBurntFee = "burnt_fee"
)

Types

type AppModule

type AppModule struct {
	ethermint.AppModule
	// contains filtered or unexported fields
}

AppModule implements an application module for the evm module.

func NewAppModule

func NewAppModule(
	k *keeper.Keeper,
	ak types.AccountKeeper,
	bankKeeper types.BankKeeper,
	ss types.Subspace,
) AppModule

NewAppModule creates a new AppModule object

func (AppModule) RegisterServices

func (am AppModule) RegisterServices(cfg module.Configurator)

RegisterServices registers a GRPC query service to respond to the module-specific GRPC queries.

type Keeper

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

func (*Keeper) ApplyTransaction

func (k *Keeper) ApplyTransaction(ctx sdk.Context, tx *ethtypes.Transaction, feePayerAddr string) (*types.MsgEthereumTxResponse, error)

ApplyTransaction runs and attempts to perform a state transition with the given transaction (i.e Message), that will only be persisted (committed) to the underlying KVStore if the transaction does not fail.

Gas tracking

Ethereum consumes gas according to the EVM opcodes instead of general reads and writes to store. Because of this, the state transition needs to ignore the SDK gas consumption mechanism defined by the GasKVStore and instead consume the amount of gas used by the VM execution. The amount of gas used is tracked by the EVM and returned in the execution result.

Prior to the execution, the starting tx gas meter is saved and replaced with an infinite gas meter in a new context in order to ignore the SDK gas consumption config values (read, write, has, delete). After the execution, the gas used from the message execution will be added to the starting gas consumed, taking into consideration the amount of gas returned. Finally, the context is updated with the EVM gas consumed value prior to returning.

For relevant discussion see: https://github.com/cosmos/cosmos-sdk/discussions/9072

func (*Keeper) EthereumTx

func (k *Keeper) EthereumTx(
	goCtx context.Context,
	msg *types.MsgEthereumTx,
) (*types.MsgEthereumTxResponse, error)

EthereumTx implements the gRPC MsgServer interface. It receives a transaction which is then executed (i.e applied) against the go-ethereum EVM. The provided SDK Context is set to the Keeper so that it can implements and call the StateDB methods without receiving it as a function parameter.

func (*Keeper) RefundGas

func (k *Keeper) RefundGas(ctx sdk.Context, msg core.Message, leftoverGas uint64, feePayer string, denom string) error

RefundGas transfers the leftover gas to the sender of the message, caped to half of the total gas consumed in the transaction. Additionally, the function sets the total gas consumed to the value returned by the EVM execution, thus ignoring the previous intrinsic gas consumed during in the AnteHandler.

func (*Keeper) UpdateParams

func (k *Keeper) UpdateParams(
	goCtx context.Context,
	msg *types.MsgUpdateParams,
) (*types.MsgUpdateParamsResponse, error)

UpdateParams updates the parameters for the EVM module.

It takes a context.Context object and a *types.MsgUpdateParams object as parameters. The function returns a *types.MsgUpdateParamsResponse object and an error.