laconicd-deprecated/x/evm/keeper/statedb.go
2021-07-26 04:40:59 -04:00

643 lines
20 KiB
Go

package keeper
import (
"bytes"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/cosmos/cosmos-sdk/store/prefix"
sdk "github.com/cosmos/cosmos-sdk/types"
ethermint "github.com/tharsis/ethermint/types"
"github.com/tharsis/ethermint/x/evm/types"
)
var _ vm.StateDB = &Keeper{}
// ----------------------------------------------------------------------------
// Account
// ----------------------------------------------------------------------------
// CreateAccount creates a new EthAccount instance from the provided address and
// sets the value to store.
func (k *Keeper) CreateAccount(addr common.Address) {
cosmosAddr := sdk.AccAddress(addr.Bytes())
account := k.accountKeeper.GetAccount(k.ctx, cosmosAddr)
log := ""
if account == nil {
log = "account created"
} else {
log = "account overwritten"
k.ResetAccount(addr)
}
account = k.accountKeeper.NewAccountWithAddress(k.ctx, cosmosAddr)
k.accountKeeper.SetAccount(k.ctx, account)
k.Logger(k.ctx).Debug(
log,
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
)
}
// ----------------------------------------------------------------------------
// Balance
// ----------------------------------------------------------------------------
// AddBalance calls CommitStateDB.AddBalance using the passed in context
func (k *Keeper) AddBalance(addr common.Address, amount *big.Int) {
if amount.Sign() != 1 {
k.Logger(k.ctx).Debug(
"ignored non-positive amount addition",
"ethereum-address", addr.Hex(),
"amount", amount.Int64(),
)
return
}
cosmosAddr := sdk.AccAddress(addr.Bytes())
params := k.GetParams(k.ctx)
coins := sdk.Coins{sdk.NewCoin(params.EvmDenom, sdk.NewIntFromBigInt(amount))}
if err := k.bankKeeper.MintCoins(k.ctx, types.ModuleName, coins); err != nil {
k.Logger(k.ctx).Error(
"failed to mint coins when adding balance",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
return
}
if err := k.bankKeeper.SendCoinsFromModuleToAccount(k.ctx, types.ModuleName, cosmosAddr, coins); err != nil {
k.Logger(k.ctx).Error(
"failed to send from module to account when adding balance",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
return
}
k.Logger(k.ctx).Debug(
"balance addition",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
)
}
// SubBalance calls CommitStateDB.SubBalance using the passed in context
func (k *Keeper) SubBalance(addr common.Address, amount *big.Int) {
if amount.Sign() != 1 {
k.Logger(k.ctx).Debug(
"ignored non-positive amount addition",
"ethereum-address", addr.Hex(),
"amount", amount.Int64(),
)
return
}
cosmosAddr := sdk.AccAddress(addr.Bytes())
params := k.GetParams(k.ctx)
coins := sdk.Coins{sdk.NewCoin(params.EvmDenom, sdk.NewIntFromBigInt(amount))}
if err := k.bankKeeper.SendCoinsFromAccountToModule(k.ctx, cosmosAddr, types.ModuleName, coins); err != nil {
k.Logger(k.ctx).Error(
"failed to send from account to module when subtracting balance",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
return
}
if err := k.bankKeeper.BurnCoins(k.ctx, types.ModuleName, coins); err != nil {
k.Logger(k.ctx).Error(
"failed to burn coins when subtracting balance",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
return
}
k.Logger(k.ctx).Debug(
"balance subtraction",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
)
}
// GetBalance calls CommitStateDB.GetBalance using the passed in context
func (k *Keeper) GetBalance(addr common.Address) *big.Int {
cosmosAddr := sdk.AccAddress(addr.Bytes())
params := k.GetParams(k.ctx)
balance := k.bankKeeper.GetBalance(k.ctx, cosmosAddr, params.EvmDenom)
return balance.Amount.BigInt()
}
// ----------------------------------------------------------------------------
// Nonce
// ----------------------------------------------------------------------------
// GetNonce calls CommitStateDB.GetNonce using the passed in context
func (k *Keeper) GetNonce(addr common.Address) uint64 {
cosmosAddr := sdk.AccAddress(addr.Bytes())
nonce, err := k.accountKeeper.GetSequence(k.ctx, cosmosAddr)
if err != nil {
k.Logger(k.ctx).Error(
"account not found",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
}
return nonce
}
// SetNonce sets the given nonce as the sequence of the address' account. If the
// account doesn't exist, a new one will be created from the address.
func (k *Keeper) SetNonce(addr common.Address, nonce uint64) {
cosmosAddr := sdk.AccAddress(addr.Bytes())
account := k.accountKeeper.GetAccount(k.ctx, cosmosAddr)
if account == nil {
k.Logger(k.ctx).Debug(
"account not found",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
)
// create address if it doesn't exist
account = k.accountKeeper.NewAccountWithAddress(k.ctx, cosmosAddr)
}
if err := account.SetSequence(nonce); err != nil {
k.Logger(k.ctx).Error(
"failed to set nonce",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"nonce", nonce,
"error", err,
)
return
}
k.accountKeeper.SetAccount(k.ctx, account)
k.Logger(k.ctx).Debug(
"nonce set",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"nonce", nonce,
)
}
// ----------------------------------------------------------------------------
// Code
// ----------------------------------------------------------------------------
// GetCodeHash calls CommitStateDB.GetCodeHash using the passed in context
func (k *Keeper) GetCodeHash(addr common.Address) common.Hash {
cosmosAddr := sdk.AccAddress(addr.Bytes())
account := k.accountKeeper.GetAccount(k.ctx, cosmosAddr)
if account == nil {
return common.BytesToHash(types.EmptyCodeHash)
}
ethAccount, isEthAccount := account.(*ethermint.EthAccount)
if !isEthAccount {
return common.BytesToHash(types.EmptyCodeHash)
}
return common.HexToHash(ethAccount.CodeHash)
}
// GetCode calls CommitStateDB.GetCode using the passed in context
func (k *Keeper) GetCode(addr common.Address) []byte {
hash := k.GetCodeHash(addr)
if bytes.Equal(hash.Bytes(), common.BytesToHash(types.EmptyCodeHash).Bytes()) {
return nil
}
store := prefix.NewStore(k.ctx.KVStore(k.storeKey), types.KeyPrefixCode)
code := store.Get(hash.Bytes())
if len(code) == 0 {
k.Logger(k.ctx).Debug(
"code not found",
"ethereum-address", addr.Hex(),
"code-hash", hash.Hex(),
)
}
return code
}
// SetCode calls CommitStateDB.SetCode using the passed in context
func (k *Keeper) SetCode(addr common.Address, code []byte) {
if bytes.Equal(code, types.EmptyCodeHash) {
k.Logger(k.ctx).Debug("passed in EmptyCodeHash, but expected empty code")
}
hash := crypto.Keccak256Hash(code)
// update account code hash
account := k.accountKeeper.GetAccount(k.ctx, addr.Bytes())
if account == nil {
account = k.accountKeeper.NewAccountWithAddress(k.ctx, addr.Bytes())
k.accountKeeper.SetAccount(k.ctx, account)
}
ethAccount, isEthAccount := account.(*ethermint.EthAccount)
if !isEthAccount {
k.Logger(k.ctx).Error(
"invalid account type",
"ethereum-address", addr.Hex(),
"code-hash", hash.Hex(),
)
return
}
ethAccount.CodeHash = hash.Hex()
k.accountKeeper.SetAccount(k.ctx, ethAccount)
store := prefix.NewStore(k.ctx.KVStore(k.storeKey), types.KeyPrefixCode)
action := "updated"
// store or delete code
if len(code) == 0 {
store.Delete(hash.Bytes())
action = "deleted"
} else {
store.Set(hash.Bytes(), code)
}
k.Logger(k.ctx).Debug(
fmt.Sprintf("code %s", action),
"ethereum-address", addr.Hex(),
"code-hash", hash.Hex(),
)
}
// GetCodeSize returns the size of the contract code associated with this object,
// or zero if none.
func (k *Keeper) GetCodeSize(addr common.Address) int {
code := k.GetCode(addr)
return len(code)
}
// ----------------------------------------------------------------------------
// Refund
// ----------------------------------------------------------------------------
// NOTE: gas refunded needs to be tracked and stored in a separate variable in
// order to add it subtract/add it from/to the gas used value after the EVM
// execution has finalized. The refund value is cleared on every transaction and
// at the end of every block.
// AddRefund adds the given amount of gas to the refund cached value.
func (k *Keeper) AddRefund(gas uint64) {
refund := k.GetRefund()
refund += gas
store := k.ctx.TransientStore(k.transientKey)
store.Set(types.KeyPrefixTransientRefund, sdk.Uint64ToBigEndian(refund))
}
// SubRefund subtracts the given amount of gas from the refund value. This function
// will panic if gas amount is greater than the stored refund.
func (k *Keeper) SubRefund(gas uint64) {
refund := k.GetRefund()
if gas > refund {
// TODO: (@fedekunze) set to 0?? Geth panics here
panic("refund counter below zero")
}
refund -= gas
store := k.ctx.TransientStore(k.transientKey)
store.Set(types.KeyPrefixTransientRefund, sdk.Uint64ToBigEndian(refund))
}
// GetRefund returns the amount of gas available for return after the tx execution
// finalises. This value is reset to 0 on every transaction.
func (k *Keeper) GetRefund() uint64 {
store := k.ctx.TransientStore(k.transientKey)
bz := store.Get(types.KeyPrefixTransientRefund)
if len(bz) == 0 {
return 0
}
return sdk.BigEndianToUint64(bz)
}
// ----------------------------------------------------------------------------
// State
// ----------------------------------------------------------------------------
// GetCommittedState returns the value set in store for the given key hash. If the key is not registered
// this function returns the empty hash.
func (k *Keeper) GetCommittedState(addr common.Address, hash common.Hash) common.Hash {
store := prefix.NewStore(k.ctx.KVStore(k.storeKey), types.AddressStoragePrefix(addr))
key := types.KeyAddressStorage(addr, hash)
value := store.Get(key.Bytes())
if len(value) == 0 {
return common.Hash{}
}
return common.BytesToHash(value)
}
// GetState returns the committed state for the given key hash, as all changes are committed directly
// to the KVStore.
func (k *Keeper) GetState(addr common.Address, hash common.Hash) common.Hash {
return k.GetCommittedState(addr, hash)
}
// SetState sets the given hashes (key, value) to the KVStore. If the value hash is empty, this
// function deletes the key from the store.
func (k *Keeper) SetState(addr common.Address, key, value common.Hash) {
store := prefix.NewStore(k.ctx.KVStore(k.storeKey), types.AddressStoragePrefix(addr))
key = types.KeyAddressStorage(addr, key)
action := "updated"
if ethermint.IsEmptyHash(value.Hex()) {
store.Delete(key.Bytes())
action = "deleted"
} else {
store.Set(key.Bytes(), value.Bytes())
}
k.Logger(k.ctx).Debug(
fmt.Sprintf("state %s", action),
"ethereum-address", addr.Hex(),
"key", key.Hex(),
)
}
// ----------------------------------------------------------------------------
// Suicide
// ----------------------------------------------------------------------------
// Suicide marks the given account as suicided and clears the account balance of
// the EVM tokens.
func (k *Keeper) Suicide(addr common.Address) bool {
prev := k.HasSuicided(addr)
if prev {
return true
}
cosmosAddr := sdk.AccAddress(addr.Bytes())
_, err := k.ClearBalance(cosmosAddr)
if err != nil {
k.Logger(k.ctx).Error(
"failed to subtract balance on suicide",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
"error", err,
)
return false
}
// TODO: (@fedekunze) do we also need to delete the storage state and the code?
// Set a single byte to the transient store
store := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientSuicided)
store.Set(addr.Bytes(), []byte{1})
k.Logger(k.ctx).Debug(
"account suicided",
"ethereum-address", addr.Hex(),
"cosmos-address", cosmosAddr.String(),
)
return true
}
// HasSuicided queries the transient store to check if the account has been marked as suicided in the
// current block. Accounts that are suicided will be returned as non-nil during queries and "cleared"
// after the block has been committed.
func (k *Keeper) HasSuicided(addr common.Address) bool {
store := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientSuicided)
return store.Has(addr.Bytes())
}
// ----------------------------------------------------------------------------
// Account Exist / Empty
// ----------------------------------------------------------------------------
// Exist returns true if the given account exists in store or if it has been
// marked as suicided in the transient store.
func (k *Keeper) Exist(addr common.Address) bool {
// return true if the account has suicided
if k.HasSuicided(addr) {
return true
}
cosmosAddr := sdk.AccAddress(addr.Bytes())
account := k.accountKeeper.GetAccount(k.ctx, cosmosAddr)
return account != nil
}
// Empty returns true if the address meets the following conditions:
// - nonce is 0
// - balance amount for evm denom is 0
// - account code hash is empty
//
// Non-ethereum accounts are considered not empty
func (k *Keeper) Empty(addr common.Address) bool {
nonce := uint64(0)
codeHash := types.EmptyCodeHash
cosmosAddr := sdk.AccAddress(addr.Bytes())
account := k.accountKeeper.GetAccount(k.ctx, cosmosAddr)
if account != nil {
nonce = account.GetSequence()
ethAccount, isEthAccount := account.(*ethermint.EthAccount)
if !isEthAccount {
return false
}
codeHash = common.HexToHash(ethAccount.CodeHash).Bytes()
}
balance := k.GetBalance(addr)
hasZeroBalance := balance.Sign() == 0
hasEmptyCodeHash := bytes.Equal(codeHash, types.EmptyCodeHash)
return hasZeroBalance && nonce == 0 && hasEmptyCodeHash
}
// ----------------------------------------------------------------------------
// Access List
// ----------------------------------------------------------------------------
// PrepareAccessList handles the preparatory steps for executing a 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)
//
// This method should only be called if Yolov3/Berlin/2929+2930 is applicable at the current number.
func (k *Keeper) PrepareAccessList(sender common.Address, dest *common.Address, precompiles []common.Address, txAccesses ethtypes.AccessList) {
k.AddAddressToAccessList(sender)
if dest != nil {
k.AddAddressToAccessList(*dest)
// If it's a create-tx, the destination will be added inside evm.create
}
for _, addr := range precompiles {
k.AddAddressToAccessList(addr)
}
for _, tuple := range txAccesses {
k.AddAddressToAccessList(tuple.Address)
for _, key := range tuple.StorageKeys {
k.AddSlotToAccessList(tuple.Address, key)
}
}
}
// AddressInAccessList returns true if the address is registered on the transient store.
func (k *Keeper) AddressInAccessList(addr common.Address) bool {
ts := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientAccessListAddress)
return ts.Has(addr.Bytes())
}
// SlotInAccessList checks if the address and the slots are registered in the transient store
func (k *Keeper) SlotInAccessList(addr common.Address, slot common.Hash) (addressOk bool, slotOk bool) {
addressOk = k.AddressInAccessList(addr)
slotOk = k.addressSlotInAccessList(addr, slot)
return addressOk, slotOk
}
// addressSlotInAccessList returns true if the address's slot is registered on the transient store.
func (k *Keeper) addressSlotInAccessList(addr common.Address, slot common.Hash) bool {
ts := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientAccessListSlot)
key := append(addr.Bytes(), slot.Bytes()...)
return ts.Has(key)
}
// AddAddressToAccessList adds the given address to the access list. If the address is already
// in the access list, this function performs a no-op.
func (k *Keeper) AddAddressToAccessList(addr common.Address) {
if k.AddressInAccessList(addr) {
return
}
ts := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientAccessListAddress)
ts.Set(addr.Bytes(), []byte{0x1})
}
// AddSlotToAccessList adds the given (address, slot) to the access list. If the address and slot are
// already in the access list, this function performs a no-op.
func (k *Keeper) AddSlotToAccessList(addr common.Address, slot common.Hash) {
k.AddAddressToAccessList(addr)
if k.addressSlotInAccessList(addr, slot) {
return
}
ts := prefix.NewStore(k.ctx.TransientStore(k.transientKey), types.KeyPrefixTransientAccessListSlot)
key := append(addr.Bytes(), slot.Bytes()...)
ts.Set(key, []byte{0x1})
}
// ----------------------------------------------------------------------------
// Snapshotting
// ----------------------------------------------------------------------------
// Snapshot return zero as the state changes won't be committed if the state transition fails. So there
// is no need to snapshot before the VM execution.
// See Cosmos SDK docs for more info: https://docs.cosmos.network/master/core/baseapp.html#delivertx-state-updates
func (k *Keeper) Snapshot() int {
return 0
}
// RevertToSnapshot performs a no-op because when a transaction execution fails on the EVM, the state
// won't be persisted during ABCI DeliverTx.
func (k *Keeper) RevertToSnapshot(_ int) {}
// ----------------------------------------------------------------------------
// Log
// ----------------------------------------------------------------------------
// AddLog appends the given ethereum Log to the list of Logs associated with the transaction hash kept in the current
// context. This function also fills in the tx hash, block hash, tx index and log index fields before setting the log
// to store.
func (k *Keeper) AddLog(log *ethtypes.Log) {
log.BlockHash = common.BytesToHash(k.ctx.HeaderHash())
log.TxIndex = uint(k.GetTxIndexTransient())
log.TxHash = k.GetTxHashTransient()
log.Index = uint(k.GetLogSizeTransient())
k.IncreaseLogSizeTransient()
logs := k.GetTxLogs(log.TxHash)
logs = append(logs, log)
k.SetLogs(log.TxHash, logs)
k.Logger(k.ctx).Debug(
"log added",
"tx-hash-ethereum", log.TxHash.Hex(),
"log-index", int(log.Index),
)
}
// ----------------------------------------------------------------------------
// Trie
// ----------------------------------------------------------------------------
// AddPreimage performs a no-op since the EnablePreimageRecording flag is disabled
// on the vm.Config during state transitions. No store trie preimages are written
// to the database.
func (k *Keeper) AddPreimage(_ common.Hash, _ []byte) {}
// ----------------------------------------------------------------------------
// Iterator
// ----------------------------------------------------------------------------
// ForEachStorage calls CommitStateDB.ForEachStorage using passed in context
func (k *Keeper) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool) error {
store := k.ctx.KVStore(k.storeKey)
prefix := types.AddressStoragePrefix(addr)
iterator := sdk.KVStorePrefixIterator(store, prefix)
defer iterator.Close()
for ; iterator.Valid(); iterator.Next() {
// TODO: check if the key prefix needs to be trimmed
key := common.BytesToHash(iterator.Key())
value := common.BytesToHash(iterator.Value())
// check if iteration stops
if cb(key, value) {
return nil
}
}
return nil
}