295 lines
7.5 KiB
Go
295 lines
7.5 KiB
Go
package state
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"math/big"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
auth "github.com/cosmos/cosmos-sdk/x/auth"
|
|
|
|
"github.com/cosmos/ethermint/types"
|
|
ethcmn "github.com/ethereum/go-ethereum/common"
|
|
ethstate "github.com/ethereum/go-ethereum/core/state"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
)
|
|
|
|
var (
|
|
_ ethstate.StateObject = (*stateObject)(nil)
|
|
|
|
emptyCodeHash = crypto.Keccak256(nil)
|
|
)
|
|
|
|
type (
|
|
// stateObject represents an Ethereum account which is being modified.
|
|
//
|
|
// The usage pattern is as follows:
|
|
// First you need to obtain a state object.
|
|
// Account values can be accessed and modified through the object.
|
|
// Finally, call CommitTrie to write the modified storage trie into a database.
|
|
stateObject struct {
|
|
address ethcmn.Address
|
|
stateDB *CommitStateDB
|
|
account *types.Account
|
|
|
|
// DB error.
|
|
// State objects are used by the consensus core and VM which are
|
|
// unable to deal with database-level errors. Any error that occurs
|
|
// during a database read is memoized here and will eventually be returned
|
|
// by StateDB.Commit.
|
|
dbErr error
|
|
|
|
code types.Code // contract bytecode, which gets set when code is loaded
|
|
|
|
originStorage types.Storage // Storage cache of original entries to dedup rewrites
|
|
dirtyStorage types.Storage // Storage entries that need to be flushed to disk
|
|
|
|
// cache flags
|
|
//
|
|
// When an object is marked suicided it will be delete from the trie during
|
|
// the "update" phase of the state transition.
|
|
dirtyCode bool // true if the code was updated
|
|
suicided bool
|
|
deleted bool
|
|
}
|
|
)
|
|
|
|
func newObject(db *CommitStateDB, accProto auth.Account) *stateObject {
|
|
acc, ok := accProto.(*types.Account)
|
|
if !ok {
|
|
panic(fmt.Sprintf("invalid account type for state object: %T", acc))
|
|
}
|
|
|
|
if acc.CodeHash == nil {
|
|
acc.CodeHash = emptyCodeHash
|
|
}
|
|
|
|
return &stateObject{
|
|
stateDB: db,
|
|
account: acc,
|
|
address: ethcmn.BytesToAddress(acc.Address.Bytes()),
|
|
originStorage: make(types.Storage),
|
|
dirtyStorage: make(types.Storage),
|
|
}
|
|
}
|
|
|
|
// GetState retrieves a value from the account storage trie. Note, the key must
|
|
// be prefixed with the address.
|
|
func (so *stateObject) GetState(_ ethstate.Database, key ethcmn.Hash) ethcmn.Hash {
|
|
// if we have a dirty value for this state entry, return it
|
|
value, dirty := so.dirtyStorage[key]
|
|
if dirty {
|
|
return value
|
|
}
|
|
|
|
// otherwise return the entry's original value
|
|
return so.getCommittedState(so.stateDB.ctx, key)
|
|
}
|
|
|
|
// GetCommittedState retrieves a value from the committed account storage trie.
|
|
// Note, the must be prefixed with the address.
|
|
func (so *stateObject) getCommittedState(ctx sdk.Context, key ethcmn.Hash) ethcmn.Hash {
|
|
// if we have the original value cached, return that
|
|
value, cached := so.originStorage[key]
|
|
if cached {
|
|
return value
|
|
}
|
|
|
|
// otherwise load the value from the KVStore
|
|
store := ctx.KVStore(so.stateDB.storageKey)
|
|
rawValue := store.Get(key.Bytes())
|
|
|
|
if len(rawValue) > 0 {
|
|
value.SetBytes(rawValue)
|
|
}
|
|
|
|
so.originStorage[key] = value
|
|
return value
|
|
}
|
|
|
|
// SetState updates a value in account storage. Note, the key must be prefixed
|
|
// with the address.
|
|
func (so *stateObject) SetState(db ethstate.Database, key, value ethcmn.Hash) {
|
|
// if the new value is the same as old, don't set
|
|
prev := so.GetState(db, key)
|
|
if prev == value {
|
|
return
|
|
}
|
|
|
|
// since the new value is different, update and journal the change
|
|
so.stateDB.journal.append(storageChange{
|
|
account: &so.address,
|
|
key: key,
|
|
prevalue: prev,
|
|
})
|
|
|
|
so.setState(key, value)
|
|
}
|
|
|
|
func (so *stateObject) setState(key, value ethcmn.Hash) {
|
|
so.dirtyStorage[key] = value
|
|
}
|
|
|
|
// Code returns the contract code associated with this object, if any.
|
|
func (so *stateObject) Code(_ ethstate.Database) []byte {
|
|
if so.code != nil {
|
|
return so.code
|
|
}
|
|
|
|
if bytes.Equal(so.CodeHash(), emptyCodeHash) {
|
|
return nil
|
|
}
|
|
|
|
store := so.stateDB.ctx.KVStore(so.stateDB.codeKey)
|
|
code := store.Get(so.CodeHash())
|
|
|
|
if len(code) == 0 {
|
|
so.setError(fmt.Errorf("failed to get code hash %x for address: %x", so.CodeHash(), so.Address()))
|
|
}
|
|
|
|
so.code = code
|
|
return code
|
|
}
|
|
|
|
// SetCode sets the state object's code.
|
|
func (so *stateObject) SetCode(codeHash ethcmn.Hash, code []byte) {
|
|
prevcode := so.Code(nil)
|
|
|
|
so.stateDB.journal.append(codeChange{
|
|
account: &so.address,
|
|
prevhash: so.CodeHash(),
|
|
prevcode: prevcode,
|
|
})
|
|
|
|
so.setCode(codeHash, code)
|
|
}
|
|
|
|
func (so *stateObject) setCode(codeHash ethcmn.Hash, code []byte) {
|
|
so.code = code
|
|
so.account.CodeHash = codeHash.Bytes()
|
|
so.dirtyCode = true
|
|
}
|
|
|
|
// AddBalance adds an amount to a state object's balance. It is used to add
|
|
// funds to the destination account of a transfer.
|
|
func (so *stateObject) AddBalance(amount *big.Int) {
|
|
amt := sdk.NewIntFromBigInt(amount)
|
|
|
|
// EIP158: We must check emptiness for the objects such that the account
|
|
// clearing (0,0,0 objects) can take effect.
|
|
if amt.Sign() == 0 {
|
|
if so.empty() {
|
|
so.touch()
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
newBalance := so.account.Balance().Add(amt)
|
|
so.SetBalance(newBalance.BigInt())
|
|
}
|
|
|
|
// SubBalance removes an amount from the stateObject's balance. It is used to
|
|
// remove funds from the origin account of a transfer.
|
|
func (so *stateObject) SubBalance(amount *big.Int) {
|
|
amt := sdk.NewIntFromBigInt(amount)
|
|
|
|
if amt.Sign() == 0 {
|
|
return
|
|
}
|
|
|
|
newBalance := so.account.Balance().Sub(amt)
|
|
so.SetBalance(newBalance.BigInt())
|
|
}
|
|
|
|
// SetBalance sets the state object's balance.
|
|
func (so *stateObject) SetBalance(amount *big.Int) {
|
|
amt := sdk.NewIntFromBigInt(amount)
|
|
|
|
so.stateDB.journal.append(balanceChange{
|
|
account: &so.address,
|
|
prev: so.account.Balance(),
|
|
})
|
|
|
|
so.setBalance(amt)
|
|
}
|
|
|
|
func (so *stateObject) setBalance(amount sdk.Int) {
|
|
so.account.SetBalance(amount)
|
|
}
|
|
|
|
// Balance returns the state object's current balance.
|
|
func (so *stateObject) Balance() *big.Int {
|
|
return so.account.Balance().BigInt()
|
|
}
|
|
|
|
// ReturnGas returns the gas back to the origin. Used by the Virtual machine or
|
|
// Closures. It performs a no-op.
|
|
func (so *stateObject) ReturnGas(gas *big.Int) {}
|
|
|
|
// Address returns the address of the state object.
|
|
func (so stateObject) Address() ethcmn.Address {
|
|
return so.address
|
|
}
|
|
|
|
// CodeHash returns the state object's code hash.
|
|
func (so *stateObject) CodeHash() []byte {
|
|
return so.account.CodeHash
|
|
}
|
|
|
|
// Nonce returns the state object's current nonce (sequence number).
|
|
func (so *stateObject) Nonce() uint64 {
|
|
return uint64(so.account.Sequence)
|
|
}
|
|
|
|
// SetNonce sets the state object's nonce (sequence number).
|
|
func (so *stateObject) SetNonce(nonce uint64) {
|
|
so.stateDB.journal.append(nonceChange{
|
|
account: &so.address,
|
|
prev: so.account.Sequence,
|
|
})
|
|
|
|
so.setNonce(int64(nonce))
|
|
}
|
|
|
|
func (so *stateObject) setNonce(nonce int64) {
|
|
so.account.Sequence = nonce
|
|
}
|
|
|
|
// setError remembers the first non-nil error it is called with.
|
|
func (so *stateObject) setError(err error) {
|
|
if so.dbErr == nil {
|
|
so.dbErr = err
|
|
}
|
|
}
|
|
|
|
// empty returns whether the account is considered empty.
|
|
func (so *stateObject) empty() bool {
|
|
return so.account.Sequence == 0 &&
|
|
so.account.Balance().Sign() == 0 &&
|
|
bytes.Equal(so.account.CodeHash, emptyCodeHash)
|
|
}
|
|
|
|
func (so *stateObject) touch() {
|
|
so.stateDB.journal.append(touchChange{
|
|
account: &so.address,
|
|
})
|
|
|
|
if so.address == ripemd {
|
|
// Explicitly put it in the dirty-cache, which is otherwise generated from
|
|
// flattened journals.
|
|
so.stateDB.journal.dirty(so.address)
|
|
}
|
|
}
|
|
|
|
// prefixStorageKey prefixes a storage key with the state object's address.
|
|
func (so stateObject) prefixStorageKey(key []byte) []byte {
|
|
prefix := so.Address().Bytes()
|
|
compositeKey := make([]byte, len(prefix)+len(key))
|
|
|
|
copy(compositeKey, prefix)
|
|
copy(compositeKey[len(prefix):], key)
|
|
|
|
return compositeKey
|
|
}
|