This section defines the sdk.Msg concrete types that result in the state transitions defined on the previous section.
MsgEthereumTx
An EVM state transition can be achieved by using the MsgEthereumTx. This message encapsulates an Ethereum transaction data (TxData) as a sdk.Msg.
It contains the necessary transaction data fields. Note, that the MsgEthereumTx implements both the and interfaces. Normally, SDK messages only implement the former, while the latter is a group of messages bundled together.
type MsgEthereumTx struct {
// inner transaction data
Data *types.Any `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
// DEPRECATED: encoded storage size of the transaction
Size_ float64 `protobuf:"fixed64,2,opt,name=size,proto3" json:"-"`
// transaction hash in hex format
Hash string `protobuf:"bytes,3,opt,name=hash,proto3" json:"hash,omitempty" rlp:"-"`
// ethereum signer address in hex format. This address value is checked
// against the address derived from the signature (V, R, S) using the
// secp256k1 elliptic curve
From string `protobuf:"bytes,4,opt,name=from,proto3" json:"from,omitempty"`
}
This message field validation is expected to fail if:
From field is defined and the address is invalid
TxData stateless validation fails
The transaction execution is expected to fail if:
Any of the custom AnteHandler Ethereum decorators checks fail:
Minimum gas amount requirements for transaction
Tx sender account doesn't exist or hasn't enough balance for fees
Account sequence doesn't match the transaction Data.AccountNonce
Message signature verification fails
EVM contract creation (i.e evm.Create) fails, or evm.Call fails
Conversion
The MsgEthreumTx can be converted to the go-ethereum Transaction and Message types in order to create and call evm contracts.
// AsTransaction creates an Ethereum Transaction type from the msg fields
func (msg MsgEthereumTx) AsTransaction() *ethtypes.Transaction {
txData, err := UnpackTxData(msg.Data)
if err != nil {
return nil
}
return ethtypes.NewTx(txData.AsEthereumData())
}
// AsMessage returns the transaction as a core.Message.
func (tx *Transaction) AsMessage(s Signer, baseFee *big.Int) (Message, error) {
msg := Message{
nonce: tx.Nonce(),
gasLimit: tx.Gas(),
gasPrice: new(big.Int).Set(tx.GasPrice()),
gasFeeCap: new(big.Int).Set(tx.GasFeeCap()),
gasTipCap: new(big.Int).Set(tx.GasTipCap()),
to: tx.To(),
amount: tx.Value(),
data: tx.Data(),
accessList: tx.AccessList(),
isFake: false,
}
// If baseFee provided, set gasPrice to effectiveGasPrice.
if baseFee != nil {
msg.gasPrice = math.BigMin(msg.gasPrice.Add(msg.gasTipCap, baseFee), msg.gasFeeCap)
}
var err error
msg.from, err = Sender(s, tx)
return msg, err
}
Signing
In order for the signature verification to be valid, the TxData must contain the v | r | s values from the Signer. Sign calculates a secp256k1 ECDSA signature and signs the transaction. It takes a keyring signer and the chainID to sign an Ethereum transaction according to EIP155 standard.
This method mutates the transaction as it populates the V, R, S fields of the Transaction's Signature. The function will fail if the sender address is not defined for the msg or if the sender is not registered on the keyring.
// Sign calculates a secp256k1 ECDSA signature and signs the transaction. It
// takes a keyring signer and the chainID to sign an Ethereum transaction according to
// EIP155 standard.
// This method mutates the transaction as it populates the V, R, S
// fields of the Transaction's Signature.
// The function will fail if the sender address is not defined for the msg or if
// the sender is not registered on the keyring
func (msg *MsgEthereumTx) Sign(ethSigner ethtypes.Signer, keyringSigner keyring.Signer) error {
from := msg.GetFrom()
if from.Empty() {
return fmt.Errorf("sender address not defined for message")
}
tx := msg.AsTransaction()
txHash := ethSigner.Hash(tx)
sig, _, err := keyringSigner.SignByAddress(from, txHash.Bytes())
if err != nil {
return err
}
tx, err = tx.WithSignature(ethSigner, sig)
if err != nil {
return err
}
msg.FromEthereumTx(tx)
return nil
}
TxData
The MsgEthereumTx supports the 3 valid Ethereum transaction data types from go-ethereum: LegacyTx, AccessListTx and DynamicFeeTx. These types are defined as protobuf messages and packed into a proto.Any interface type in the MsgEthereumTx field.
LegacyTx
The transaction data of regular Ethereum transactions.
type LegacyTx struct {
// nonce corresponds to the account nonce (transaction sequence).
Nonce uint64 `protobuf:"varint,1,opt,name=nonce,proto3" json:"nonce,omitempty"`
// gas price defines the value for each gas unit
GasPrice *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,2,opt,name=gas_price,json=gasPrice,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"gas_price,omitempty"`
// gas defines the gas limit defined for the transaction.
GasLimit uint64 `protobuf:"varint,3,opt,name=gas,proto3" json:"gas,omitempty"`
// hex formatted address of the recipient
To string `protobuf:"bytes,4,opt,name=to,proto3" json:"to,omitempty"`
// value defines the unsigned integer value of the transaction amount.
Amount *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,5,opt,name=value,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"value,omitempty"`
// input defines the data payload bytes of the transaction.
Data []byte `protobuf:"bytes,6,opt,name=data,proto3" json:"data,omitempty"`
// v defines the signature value
V []byte `protobuf:"bytes,7,opt,name=v,proto3" json:"v,omitempty"`
// r defines the signature value
R []byte `protobuf:"bytes,8,opt,name=r,proto3" json:"r,omitempty"`
// s define the signature value
S []byte `protobuf:"bytes,9,opt,name=s,proto3" json:"s,omitempty"`
}
This message field validation is expected to fail if:
GasPrice is invalid (nil , negaitve or out of int256 bound)
Fee (gasprice * gaslimit) is invalid
Amount is invalid (negaitve or out of int256 bound)
To address is invalid (non valid ethereum hex address)
DynamicFeeTx
The transaction data of EIP-1559 dynamic fee transactions.
type DynamicFeeTx struct {
// destination EVM chain ID
ChainID *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,1,opt,name=chain_id,json=chainId,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"chainID"`
// nonce corresponds to the account nonce (transaction sequence).
Nonce uint64 `protobuf:"varint,2,opt,name=nonce,proto3" json:"nonce,omitempty"`
// gas tip cap defines the max value for the gas tip
GasTipCap *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,3,opt,name=gas_tip_cap,json=gasTipCap,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"gas_tip_cap,omitempty"`
// gas fee cap defines the max value for the gas fee
GasFeeCap *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,4,opt,name=gas_fee_cap,json=gasFeeCap,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"gas_fee_cap,omitempty"`
// gas defines the gas limit defined for the transaction.
GasLimit uint64 `protobuf:"varint,5,opt,name=gas,proto3" json:"gas,omitempty"`
// hex formatted address of the recipient
To string `protobuf:"bytes,6,opt,name=to,proto3" json:"to,omitempty"`
// value defines the the transaction amount.
Amount *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,7,opt,name=value,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"value,omitempty"`
// input defines the data payload bytes of the transaction.
Data []byte `protobuf:"bytes,8,opt,name=data,proto3" json:"data,omitempty"`
Accesses AccessList `protobuf:"bytes,9,rep,name=accesses,proto3,castrepeated=AccessList" json:"accessList"`
// v defines the signature value
V []byte `protobuf:"bytes,10,opt,name=v,proto3" json:"v,omitempty"`
// r defines the signature value
R []byte `protobuf:"bytes,11,opt,name=r,proto3" json:"r,omitempty"`
// s define the signature value
S []byte `protobuf:"bytes,12,opt,name=s,proto3" json:"s,omitempty"`
}
This message field validation is expected to fail if:
GasTipCap is invalid (nil , negative or overflows int256)
GasFeeCap is invalid (nil , negative or overflows int256)
GasFeeCap is less than GasTipCap
Fee (gas price * gas limit) is invalid (overflows int256)
Amount is invalid (negative or overflows int256)
To address is invalid (non-valid ethereum hex address)
ChainID is nil
AccessListTx
The transaction data of EIP-2930 access list transactions.
type AccessListTx struct {
// destination EVM chain ID
ChainID *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,1,opt,name=chain_id,json=chainId,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"chainID"`
// nonce corresponds to the account nonce (transaction sequence).
Nonce uint64 `protobuf:"varint,2,opt,name=nonce,proto3" json:"nonce,omitempty"`
// gas price defines the value for each gas unit
GasPrice *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,3,opt,name=gas_price,json=gasPrice,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"gas_price,omitempty"`
// gas defines the gas limit defined for the transaction.
GasLimit uint64 `protobuf:"varint,4,opt,name=gas,proto3" json:"gas,omitempty"`
// hex formatted address of the recipient
To string `protobuf:"bytes,5,opt,name=to,proto3" json:"to,omitempty"`
// value defines the unsigned integer value of the transaction amount.
Amount *github_com_cosmos_cosmos_sdk_types.Int `protobuf:"bytes,6,opt,name=value,proto3,customtype=github.com/cosmos/cosmos-sdk/types.Int" json:"value,omitempty"`
// input defines the data payload bytes of the transaction.
Data []byte `protobuf:"bytes,7,opt,name=data,proto3" json:"data,omitempty"`
Accesses AccessList `protobuf:"bytes,8,rep,name=accesses,proto3,castrepeated=AccessList" json:"accessList"`
// v defines the signature value
V []byte `protobuf:"bytes,9,opt,name=v,proto3" json:"v,omitempty"`
// r defines the signature value
R []byte `protobuf:"bytes,10,opt,name=r,proto3" json:"r,omitempty"`
// s define the signature value
S []byte `protobuf:"bytes,11,opt,name=s,proto3" json:"s,omitempty"`
}
This message field validation is expected to fail if:
GasPrice is invalid (nil , negative or overflows int256)
Fee (gas price * gas limit) is invalid (overflows int256)
Amount is invalid (negative or overflows int256)
To address is invalid (non-valid ethereum hex address)
ChainID is nil
LegacyTx: transaction type
DynamicFeeTx: transaction type. Enabled by London hard fork block
AccessListTx: transaction type. Enabled by Berlin hard fork block
