100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
|
package types
|
||
|
|
|
||
|
|
import (
|
||
|
|
"math/big"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"github.com/ethereum/go-ethereum/common"
|
||
|
|
"github.com/ethereum/go-ethereum/core"
|
||
|
|
"github.com/ethereum/go-ethereum/core/vm"
|
||
|
|
|
||
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
||
|
|
emint "github.com/cosmos/ethermint/types"
|
||
|
|
)
|
||
|
|
|
||
|
|
// StateTransition defines data to transitionDB in evm
|
||
|
|
type StateTransition struct {
|
||
|
|
Sender common.Address
|
||
|
|
AccountNonce uint64
|
||
|
|
Price *big.Int
|
||
|
|
GasLimit uint64
|
||
|
|
Recipient *common.Address
|
||
|
|
Amount *big.Int
|
||
|
|
Payload []byte
|
||
|
|
Csdb *CommitStateDB
|
||
|
|
ChainID *big.Int
|
||
|
|
}
|
||
|
|
|
||
|
|
// TransitionCSDB performs an evm state transition from a transaction
|
||
|
|
func (st StateTransition) TransitionCSDB(ctx sdk.Context) sdk.Result {
|
||
|
|
contractCreation := st.Recipient == nil
|
||
|
|
|
||
|
|
// Create context for evm
|
||
|
|
context := vm.Context{
|
||
|
|
CanTransfer: core.CanTransfer,
|
||
|
|
Transfer: core.Transfer,
|
||
|
|
Origin: st.Sender,
|
||
|
|
Coinbase: common.Address{},
|
||
|
|
BlockNumber: big.NewInt(ctx.BlockHeight()),
|
||
|
|
Time: big.NewInt(time.Now().Unix()),
|
||
|
|
Difficulty: big.NewInt(0x30000), // unused
|
||
|
|
GasLimit: ctx.GasMeter().Limit(),
|
||
|
|
GasPrice: ctx.MinGasPrices().AmountOf(emint.DenomDefault).Int,
|
||
|
|
}
|
||
|
|
|
||
|
|
vmenv := vm.NewEVM(context, st.Csdb.WithContext(ctx), GenerateChainConfig(st.ChainID), vm.Config{})
|
||
|
|
|
||
|
|
var (
|
||
|
|
leftOverGas uint64
|
||
|
|
addr common.Address
|
||
|
|
vmerr error
|
||
|
|
senderRef = vm.AccountRef(st.Sender)
|
||
|
|
)
|
||
|
|
|
||
|
|
if contractCreation {
|
||
|
|
_, addr, leftOverGas, vmerr = vmenv.Create(senderRef, st.Payload, st.GasLimit, st.Amount)
|
||
|
|
} else {
|
||
|
|
// Increment the nonce for the next transaction
|
||
|
|
st.Csdb.SetNonce(st.Sender, st.Csdb.GetNonce(st.Sender)+1)
|
||
|
|
_, leftOverGas, vmerr = vmenv.Call(senderRef, *st.Recipient, st.Payload, st.GasLimit, st.Amount)
|
||
|
|
}
|
||
|
|
|
||
|
|
// handle errors
|
||
|
|
if vmerr != nil {
|
||
|
|
return emint.ErrVMExecution(vmerr.Error()).Result()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Refund remaining gas from tx (Check these values and ensure gas is being consumed correctly)
|
||
|
|
refundGas(st.Csdb, &leftOverGas, st.GasLimit, context.GasPrice, st.Sender)
|
||
|
|
|
||
|
|
// add balance for the processor of the tx (determine who rewards are being processed to)
|
||
|
|
// TODO: Double check nothing needs to be done here
|
||
|
|
|
||
|
|
st.Csdb.Finalise(true) // Change to depend on config
|
||
|
|
|
||
|
|
// TODO: Consume gas from sender
|
||
|
|
|
||
|
|
return sdk.Result{Data: addr.Bytes(), GasUsed: st.GasLimit - leftOverGas}
|
||
|
|
}
|
||
|
|
|
||
|
|
func refundGas(
|
||
|
|
st vm.StateDB, gasRemaining *uint64, initialGas uint64, gasPrice *big.Int,
|
||
|
|
from common.Address,
|
||
|
|
) {
|
||
|
|
// Apply refund counter, capped to half of the used gas.
|
||
|
|
refund := (initialGas - *gasRemaining) / 2
|
||
|
|
if refund > st.GetRefund() {
|
||
|
|
refund = st.GetRefund()
|
||
|
|
}
|
||
|
|
*gasRemaining += refund
|
||
|
|
|
||
|
|
// // Return ETH for remaining gas, exchanged at the original rate.
|
||
|
|
// remaining := new(big.Int).Mul(new(big.Int).SetUint64(*gasRemaining), gasPrice)
|
||
|
|
// st.AddBalance(from, remaining)
|
||
|
|
|
||
|
|
// // Also return remaining gas to the block gas counter so it is
|
||
|
|
// // available for the next transaction.
|
||
|
|
// TODO: Return gas to block gas meter?
|
||
|
|
// st.gp.AddGas(st.gas)
|
||
|
|
}
|