Partial stateDB implementation
This commit is contained in:
Aleksandr Bezobchuk
parent
7f4dfa5d59
commit
817f9605aa
543
state/statedb.go
543
state/statedb.go
@ -3,6 +3,8 @@ package state
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import (
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"fmt"
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"math/big"
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"sort"
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"sync"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/auth"
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@ -10,10 +12,18 @@ import (
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ethcmn "github.com/ethereum/go-ethereum/common"
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ethstate "github.com/ethereum/go-ethereum/core/state"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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)
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var _ ethstate.StateDB = (*CommitStateDB)(nil)
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var (
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_ ethstate.StateDB = (*CommitStateDB)(nil)
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zeroBalance = sdk.ZeroInt().BigInt()
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)
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// CommitStateDB implements the Geth state.StateDB interface. Instead of using
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// a trie and database for querying and persistence, KVStores and an account
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// mapper is used to facilitate state transitions.
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type CommitStateDB struct {
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// TODO: Figure out a way to not need to store a context as part of the
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// structure
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@ -21,17 +31,25 @@ type CommitStateDB struct {
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am auth.AccountMapper
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storageKey sdk.StoreKey
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codeKey sdk.StoreKey
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// maps that hold 'live' objects, which will get modified while processing a
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// state transition
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//
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// TODO: Determine if we need this cache as the KVStore is cache-wrapped
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stateObjects map[ethcmn.Address]*stateObject
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stateObjectsDirty map[ethcmn.Address]struct{}
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// The refund counter, also used by state transitioning.
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refund uint64
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thash, bhash ethcmn.Hash
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txIndex int
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logs map[ethcmn.Hash][]*ethtypes.Log
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logSize uint
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preimages map[ethcmn.Hash][]byte
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// DB error.
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// State objects are used by the consensus core and VM which are
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// unable to deal with database-level errors. Any error that occurs
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@ -44,23 +62,502 @@ type CommitStateDB struct {
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journal *journal
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validRevisions []ethstate.Revision
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nextRevisionID int
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// mutex for state deep copying
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lock sync.Mutex
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}
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func NewCommitStateDB(ctx sdk.Context) (*CommitStateDB, error) {
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// tr, err := db.OpenTrie(root)
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// if err != nil {
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// return nil, err
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// }
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// TODO: Make sure storage is prefixed with address!!!
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func NewCommitStateDB(ctx sdk.Context) (*CommitStateDB, error) {
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return &CommitStateDB{
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// stateObjects: make(map[ethcmn.Address]*stateObject),
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// stateObjectsDirty: make(map[ethcmn.Address]struct{}),
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// logs: make(map[ethcmn.Hash][]*types.Log),
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// preimages: make(map[ethcmn.Hash][]byte),
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stateObjects: make(map[ethcmn.Address]*stateObject),
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stateObjectsDirty: make(map[ethcmn.Address]struct{}),
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logs: make(map[ethcmn.Hash][]*ethtypes.Log),
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journal: newJournal(),
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}, nil
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}
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// ----------------------------------------------------------------------------
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// Setters
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// ----------------------------------------------------------------------------
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// SetBalance sets the balance of an account.
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func (csdb *CommitStateDB) SetBalance(addr ethcmn.Address, amount *big.Int) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.SetBalance(amount)
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}
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}
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// AddBalance adds amount to the account associated with addr.
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func (csdb *CommitStateDB) AddBalance(addr ethcmn.Address, amount *big.Int) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.AddBalance(amount)
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}
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}
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// SubBalance subtracts amount from the account associated with addr.
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func (csdb *CommitStateDB) SubBalance(addr ethcmn.Address, amount *big.Int) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.SubBalance(amount)
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}
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}
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// SetNonce sets the nonce (sequence number) of an account.
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func (csdb *CommitStateDB) SetNonce(addr ethcmn.Address, nonce uint64) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.SetNonce(nonce)
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}
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}
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// SetState sets the storage state with a key, value pair for an account.
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func (csdb *CommitStateDB) SetState(addr ethcmn.Address, key, value ethcmn.Hash) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.SetState(nil, key, value)
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}
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}
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// SetCode sets the code for a given account.
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func (csdb *CommitStateDB) SetCode(addr ethcmn.Address, code []byte) {
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so := csdb.GetOrNewStateObject(addr)
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if so != nil {
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so.SetCode(crypto.Keccak256Hash(code), code)
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}
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}
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// AddLog adds a new log to the state and sets the log metadata from the state.
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func (csdb *CommitStateDB) AddLog(log *ethtypes.Log) {
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csdb.journal.append(addLogChange{txhash: csdb.thash})
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log.TxHash = csdb.thash
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log.BlockHash = csdb.bhash
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log.TxIndex = uint(csdb.txIndex)
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log.Index = csdb.logSize
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csdb.logs[csdb.thash] = append(csdb.logs[csdb.thash], log)
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csdb.logSize++
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}
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// AddPreimage records a SHA3 preimage seen by the VM.
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func (csdb *CommitStateDB) AddPreimage(hash ethcmn.Hash, preimage []byte) {
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if _, ok := csdb.preimages[hash]; !ok {
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csdb.journal.append(addPreimageChange{hash: hash})
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pi := make([]byte, len(preimage))
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copy(pi, preimage)
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csdb.preimages[hash] = pi
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}
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}
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// AddRefund adds gas to the refund counter.
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func (csdb *CommitStateDB) AddRefund(gas uint64) {
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csdb.journal.append(refundChange{prev: csdb.refund})
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csdb.refund += gas
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}
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// SubRefund removes gas from the refund counter. It will panic if the refund
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// counter goes below zero.
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func (csdb *CommitStateDB) SubRefund(gas uint64) {
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csdb.journal.append(refundChange{prev: csdb.refund})
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if gas > csdb.refund {
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panic("refund counter below zero")
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}
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csdb.refund -= gas
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}
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// ----------------------------------------------------------------------------
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// Getters
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// ----------------------------------------------------------------------------
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// GetBalance retrieves the balance from the given address or 0 if object not
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// found.
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func (csdb *CommitStateDB) GetBalance(addr ethcmn.Address) *big.Int {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.Balance()
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}
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return zeroBalance
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}
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// GetNonce returns the nonce (sequence number) for a given account.
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func (csdb *CommitStateDB) GetNonce(addr ethcmn.Address) uint64 {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.Nonce()
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}
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return 0
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}
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// GetCode returns the code for a given account.
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func (csdb *CommitStateDB) GetCode(addr ethcmn.Address) []byte {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.Code(nil)
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}
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return nil
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}
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// GetCodeSize returns the code size for a given account.
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func (csdb *CommitStateDB) GetCodeSize(addr ethcmn.Address) int {
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so := csdb.getStateObject(addr)
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if so == nil {
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return 0
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}
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if so.code != nil {
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return len(so.code)
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}
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// TODO: we may need to cache these lookups directly
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return len(so.Code(nil))
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}
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// GetCodeHash returns the code hash for a given account.
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func (csdb *CommitStateDB) GetCodeHash(addr ethcmn.Address) ethcmn.Hash {
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so := csdb.getStateObject(addr)
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if so == nil {
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return ethcmn.Hash{}
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}
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return ethcmn.BytesToHash(so.CodeHash())
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}
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// GetState retrieves a value from the given account's storage store.
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func (csdb *CommitStateDB) GetState(addr ethcmn.Address, hash ethcmn.Hash) ethcmn.Hash {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.GetState(nil, hash)
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}
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return ethcmn.Hash{}
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}
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// GetCommittedState retrieves a value from the given account's committed
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// storage.
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func (csdb *CommitStateDB) GetCommittedState(addr ethcmn.Address, hash ethcmn.Hash) ethcmn.Hash {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.GetCommittedState(nil, hash)
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}
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return ethcmn.Hash{}
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}
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// GetLogs returns the current logs for a given hash in the state.
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func (csdb *CommitStateDB) GetLogs(hash ethcmn.Hash) []*ethtypes.Log {
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return csdb.logs[hash]
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}
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// Logs returns all the current logs in the state.
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func (csdb *CommitStateDB) Logs() []*ethtypes.Log {
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var logs []*ethtypes.Log
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for _, lgs := range csdb.logs {
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logs = append(logs, lgs...)
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}
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return logs
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}
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// GetRefund returns the current value of the refund counter.
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func (csdb *CommitStateDB) GetRefund() uint64 {
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return csdb.refund
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}
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// Preimages returns a list of SHA3 preimages that have been submitted.
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func (csdb *CommitStateDB) Preimages() map[ethcmn.Hash][]byte {
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return csdb.preimages
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}
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// HasSuicided returns if the given account for the specified address has been
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// killed.
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func (csdb *CommitStateDB) HasSuicided(addr ethcmn.Address) bool {
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so := csdb.getStateObject(addr)
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if so != nil {
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return so.suicided
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}
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return false
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}
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// StorageTrie returns nil as the state in Ethermint does not use a direct
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// storage trie.
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func (csdb *CommitStateDB) StorageTrie(addr ethcmn.Address) ethstate.Trie {
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return nil
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}
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// ----------------------------------------------------------------------------
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// Persistance
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// ----------------------------------------------------------------------------
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// TODO: Commit writes the state ...
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func (csdb *CommitStateDB) Commit(deleteEmptyObjects bool) (root ethcmn.Hash, err error) {
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// TODO: ...
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return
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}
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// TODO: ...
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func (csdb *CommitStateDB) Finalize(deleteEmptyObjects bool) {
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// TODO: ...
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}
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// IntermediateRoot computes the current root hash of the state trie.
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// It is called in between transactions to get the root hash that
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// goes into transaction receipts.
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func (csdb *CommitStateDB) IntermediateRoot(deleteEmptyObjects bool) ethcmn.Hash {
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// TODO: ...
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// csdb.Finalize(deleteEmptyObjects)
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// return csdb.trie.Hash()
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}
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// ----------------------------------------------------------------------------
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// Snapshotting
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// ----------------------------------------------------------------------------
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// Snapshot returns an identifier for the current revision of the state.
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func (csdb *CommitStateDB) Snapshot() int {
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id := csdb.nextRevisionID
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csdb.nextRevisionID++
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csdb.validRevisions = append(csdb.validRevisions, ethstate.Revision{id, csdb.journal.length()})
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return id
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}
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// RevertToSnapshot reverts all state changes made since the given revision.
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func (csdb *CommitStateDB) RevertToSnapshot(revID int) {
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// find the snapshot in the stack of valid snapshots
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idx := sort.Search(len(csdb.validRevisions), func(i int) bool {
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return csdb.validRevisions[i].ID >= revID
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})
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if idx == len(csdb.validRevisions) || csdb.validRevisions[idx].ID != revID {
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panic(fmt.Errorf("revision ID %v cannot be reverted", revID))
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}
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snapshot := csdb.validRevisions[idx].JournalIndex
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// replay the journal to undo changes and remove invalidated snapshots
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csdb.journal.revert(csdb, snapshot)
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csdb.validRevisions = csdb.validRevisions[:idx]
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}
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// ----------------------------------------------------------------------------
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// Auxiliary
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// ----------------------------------------------------------------------------
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// Suicide marks the given account as suicided and clears the account balance.
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//
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// The account's state object is still available until the state is committed,
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// getStateObject will return a non-nil account after Suicide.
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func (csdb *CommitStateDB) Suicide(addr ethcmn.Address) bool {
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so := csdb.getStateObject(addr)
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if so == nil {
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return false
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}
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csdb.journal.append(suicideChange{
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account: &addr,
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prev: so.suicided,
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prevBalance: sdk.NewIntFromBigInt(so.Balance()),
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})
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so.markSuicided()
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so.SetBalance(new(big.Int))
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return true
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}
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// Reset clears out all ephemeral state objects from the state db, but keeps
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// the underlying account mapper and store keys to avoid reloading data for the
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// next operations.
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func (csdb *CommitStateDB) Reset(root ethcmn.Hash) error {
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csdb.stateObjects = make(map[ethcmn.Address]*stateObject)
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csdb.stateObjectsDirty = make(map[ethcmn.Address]struct{})
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csdb.thash = ethcmn.Hash{}
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csdb.bhash = ethcmn.Hash{}
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csdb.txIndex = 0
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csdb.logs = make(map[ethcmn.Hash][]*ethtypes.Log)
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csdb.logSize = 0
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csdb.preimages = make(map[ethcmn.Hash][]byte)
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csdb.clearJournalAndRefund()
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return nil
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}
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func (csdb *CommitStateDB) clearJournalAndRefund() {
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csdb.journal = newJournal()
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csdb.validRevisions = csdb.validRevisions[:0]
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csdb.refund = 0
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}
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// Prepare sets the current transaction hash and index and block hash which is
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// used when the EVM emits new state logs.
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func (csdb *CommitStateDB) Prepare(thash, bhash ethcmn.Hash, txi int) {
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csdb.thash = thash
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csdb.bhash = bhash
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csdb.txIndex = txi
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}
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// CreateAccount explicitly creates a state object. If a state object with the
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// address already exists the balance is carried over to the new account.
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//
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// CreateAccount is called during the EVM CREATE operation. The situation might
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// arise that a contract does the following:
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//
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// 1. sends funds to sha(account ++ (nonce + 1))
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// 2. tx_create(sha(account ++ nonce)) (note that this gets the address of 1)
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//
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// Carrying over the balance ensures that Ether doesn't disappear.
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func (csdb *CommitStateDB) CreateAccount(addr ethcmn.Address) {
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newobj, prevobj := csdb.createObject(addr)
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if prevobj != nil {
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newobj.setBalance(sdk.NewIntFromBigInt(prevobj.Balance()))
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}
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}
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// Copy creates a deep, independent copy of the state.
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//
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// NOTE: Snapshots of the copied state cannot be applied to the copy.
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func (csdb *CommitStateDB) Copy() ethstate.StateDB {
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csdb.lock.Lock()
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defer csdb.lock.Unlock()
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// copy all the basic fields, initialize the memory ones
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state := &CommitStateDB{
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ctx: csdb.ctx,
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am: csdb.am,
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storageKey: csdb.storageKey,
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codeKey: csdb.codeKey,
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stateObjects: make(map[ethcmn.Address]*stateObject, len(csdb.journal.dirties)),
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stateObjectsDirty: make(map[ethcmn.Address]struct{}, len(csdb.journal.dirties)),
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refund: csdb.refund,
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logs: make(map[ethcmn.Hash][]*ethtypes.Log, len(csdb.logs)),
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logSize: csdb.logSize,
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preimages: make(map[ethcmn.Hash][]byte),
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journal: newJournal(),
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}
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// copy the dirty states, logs, and preimages
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for addr := range csdb.journal.dirties {
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// There is a case where an object is in the journal but not in the
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// stateObjects: OOG after touch on ripeMD prior to Byzantium. Thus, we
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// need to check for nil.
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//
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// Ref: https://github.com/ethereum/go-ethereum/pull/16485#issuecomment-380438527
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if object, exist := csdb.stateObjects[addr]; exist {
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state.stateObjects[addr] = object.deepCopy(state)
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state.stateObjectsDirty[addr] = struct{}{}
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}
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}
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// Above, we don't copy the actual journal. This means that if the copy is
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// copied, the loop above will be a no-op, since the copy's journal is empty.
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// Thus, here we iterate over stateObjects, to enable copies of copies.
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for addr := range csdb.stateObjectsDirty {
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if _, exist := state.stateObjects[addr]; !exist {
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state.stateObjects[addr] = csdb.stateObjects[addr].deepCopy(state)
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state.stateObjectsDirty[addr] = struct{}{}
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}
|
||||
}
|
||||
|
||||
// copy logs
|
||||
for hash, logs := range csdb.logs {
|
||||
cpy := make([]*ethtypes.Log, len(logs))
|
||||
for i, l := range logs {
|
||||
cpy[i] = new(ethtypes.Log)
|
||||
*cpy[i] = *l
|
||||
}
|
||||
state.logs[hash] = cpy
|
||||
}
|
||||
|
||||
// copy pre-images
|
||||
for hash, preimage := range csdb.preimages {
|
||||
state.preimages[hash] = preimage
|
||||
}
|
||||
|
||||
return state
|
||||
}
|
||||
|
||||
// ForEachStorage iterates over each storage items, all invokes the provided
|
||||
// callback on each key, value pair .
|
||||
func (csdb *CommitStateDB) ForEachStorage(addr ethcmn.Address, cb func(key, value ethcmn.Hash) bool) {
|
||||
so := csdb.getStateObject(addr)
|
||||
if so == nil {
|
||||
return
|
||||
}
|
||||
|
||||
store := csdb.ctx.KVStore(csdb.storageKey)
|
||||
iter := sdk.KVStorePrefixIterator(store, so.Address().Bytes())
|
||||
|
||||
for ; iter.Valid(); iter.Next() {
|
||||
key := ethcmn.BytesToHash(iter.Key())
|
||||
value := iter.Value()
|
||||
|
||||
if value, dirty := so.dirtyStorage[key]; dirty {
|
||||
cb(key, value)
|
||||
continue
|
||||
}
|
||||
|
||||
cb(key, ethcmn.BytesToHash(value))
|
||||
}
|
||||
|
||||
iter.Close()
|
||||
}
|
||||
|
||||
// GetOrNewStateObject retrieves a state object or create a new state object if
|
||||
// nil.
|
||||
func (csdb *CommitStateDB) GetOrNewStateObject(addr ethcmn.Address) ethstate.StateObject {
|
||||
so := csdb.getStateObject(addr)
|
||||
if so == nil || so.deleted {
|
||||
so, _ = csdb.createObject(addr)
|
||||
}
|
||||
|
||||
return so
|
||||
}
|
||||
|
||||
// createObject creates a new state object. If there is an existing account with
|
||||
// the given address, it is overwritten and returned as the second return value.
|
||||
func (csdb *CommitStateDB) createObject(addr ethcmn.Address) (newObj, prevObj *stateObject) {
|
||||
prevObj = csdb.getStateObject(addr)
|
||||
|
||||
acc := csdb.am.NewAccountWithAddress(csdb.ctx, sdk.AccAddress(addr.Bytes()))
|
||||
newObj = newObject(csdb, acc)
|
||||
newObj.setNonce(0) // sets the object to dirty
|
||||
|
||||
if prevObj == nil {
|
||||
csdb.journal.append(createObjectChange{account: &addr})
|
||||
} else {
|
||||
csdb.journal.append(resetObjectChange{prev: prevObj})
|
||||
}
|
||||
|
||||
csdb.setStateObject(newObj)
|
||||
return newObj, prevObj
|
||||
}
|
||||
|
||||
// Empty returns whether the state object is either non-existent or empty
|
||||
// according to the EIP161 specification (balance = nonce = code = 0).
|
||||
func (csdb *CommitStateDB) Empty(addr ethcmn.Address) bool {
|
||||
so := csdb.getStateObject(addr)
|
||||
return so == nil || so.empty()
|
||||
}
|
||||
|
||||
// Exist reports whether the given account address exists in the state. Notably,
|
||||
// this also returns true for suicided accounts.
|
||||
func (csdb *CommitStateDB) Exist(addr ethcmn.Address) bool {
|
||||
return csdb.getStateObject(addr) != nil
|
||||
}
|
||||
|
||||
// Error returns the first non-nil error the StateDB encountered.
|
||||
func (csdb *CommitStateDB) Error() error {
|
||||
return csdb.dbErr
|
||||
}
|
||||
|
||||
// setError remembers the first non-nil error it is called with.
|
||||
func (csdb *CommitStateDB) setError(err error) {
|
||||
if csdb.dbErr == nil {
|
||||
@ -68,22 +565,8 @@ func (csdb *CommitStateDB) setError(err error) {
|
||||
}
|
||||
}
|
||||
|
||||
// Error returns the first non-nil error the StateDB encountered.
|
||||
func (csdb *CommitStateDB) Error() error {
|
||||
return csdb.dbErr
|
||||
}
|
||||
|
||||
// Retrieve the balance from the given address or 0 if object not found
|
||||
func (csdb *CommitStateDB) GetBalance(addr ethcmn.Address) *big.Int {
|
||||
stateObject := csdb.getStateObject(addr)
|
||||
if stateObject != nil {
|
||||
return stateObject.Balance()
|
||||
}
|
||||
|
||||
return common.Big0
|
||||
}
|
||||
|
||||
// Retrieve a state object given by the address. Returns nil if not found.
|
||||
// getStateObject attempts to retrieve a state object given by the address.
|
||||
// Returns nil and sets an error if not found.
|
||||
func (csdb *CommitStateDB) getStateObject(addr ethcmn.Address) (stateObject *stateObject) {
|
||||
// prefer 'live' (cached) objects
|
||||
if obj := csdb.stateObjects[addr]; obj != nil {
|
||||
@ -94,9 +577,11 @@ func (csdb *CommitStateDB) getStateObject(addr ethcmn.Address) (stateObject *sta
|
||||
return obj
|
||||
}
|
||||
|
||||
// otherwise, attempt to fetch the account from the account mapper
|
||||
acc := csdb.am.GetAccount(csdb.ctx, addr.Bytes())
|
||||
if acc == nil {
|
||||
csdb.setError(fmt.Errorf("no account found for address: %X", addr.Bytes()))
|
||||
return nil
|
||||
}
|
||||
|
||||
// insert the state object into the live set
|
||||
@ -108,3 +593,9 @@ func (csdb *CommitStateDB) getStateObject(addr ethcmn.Address) (stateObject *sta
|
||||
func (csdb *CommitStateDB) setStateObject(object *stateObject) {
|
||||
csdb.stateObjects[object.Address()] = object
|
||||
}
|
||||
|
||||
// Database retrieves the low level database supporting the lower level trie
|
||||
// ops. It is not used in Ethermint, so it returns nil.
|
||||
func (csdb *CommitStateDB) Database() ethstate.Database {
|
||||
return nil
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user