1086 lines
36 KiB
Go
1086 lines
36 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package state provides a caching layer atop the Ethereum state trie.
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package state
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import (
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"errors"
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"fmt"
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"math/big"
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"sort"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/state/snapshot"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/trie"
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)
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type revision struct {
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id int
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journalIndex int
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}
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var (
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// emptyRoot is the known root hash of an empty trie.
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emptyRoot = common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
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)
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type proofList [][]byte
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func (n *proofList) Put(key []byte, value []byte) error {
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*n = append(*n, value)
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return nil
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}
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func (n *proofList) Delete(key []byte) error {
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panic("not supported")
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}
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// StateDB structs within the ethereum protocol are used to store anything
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// within the merkle trie. StateDBs take care of caching and storing
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// nested states. It's the general query interface to retrieve:
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// * Contracts
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// * Accounts
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type StateDB struct {
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db Database
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prefetcher *triePrefetcher
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trie Trie
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hasher crypto.KeccakState
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// originalRoot is the pre-state root, before any changes were made.
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// It will be updated when the Commit is called.
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originalRoot common.Hash
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snaps *snapshot.Tree
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snap snapshot.Snapshot
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snapDestructs map[common.Hash]struct{}
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snapAccounts map[common.Hash][]byte
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snapStorage map[common.Hash]map[common.Hash][]byte
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// This map holds 'live' objects, which will get modified while processing a state transition.
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stateObjects map[common.Address]*stateObject
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stateObjectsPending map[common.Address]struct{} // State objects finalized but not yet written to the trie
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stateObjectsDirty map[common.Address]struct{} // State objects modified in the current execution
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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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// during a database read is memoized here and will eventually be returned
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// by StateDB.Commit.
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dbErr error
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// The refund counter, also used by state transitioning.
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refund uint64
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thash common.Hash
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txIndex int
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logs map[common.Hash][]*types.Log
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logSize uint
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preimages map[common.Hash][]byte
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// Per-transaction access list
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accessList *accessList
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// Journal of state modifications. This is the backbone of
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// Snapshot and RevertToSnapshot.
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journal *journal
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validRevisions []revision
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nextRevisionId int
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// Measurements gathered during execution for debugging purposes
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AccountReads time.Duration
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AccountHashes time.Duration
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AccountUpdates time.Duration
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AccountCommits time.Duration
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StorageReads time.Duration
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StorageHashes time.Duration
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StorageUpdates time.Duration
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StorageCommits time.Duration
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SnapshotAccountReads time.Duration
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SnapshotStorageReads time.Duration
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SnapshotCommits time.Duration
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TrieDBCommits time.Duration
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AccountUpdated int
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StorageUpdated int
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AccountDeleted int
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StorageDeleted int
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}
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// New creates a new state from a given trie.
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func New(root common.Hash, db Database, snaps *snapshot.Tree) (*StateDB, 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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sdb := &StateDB{
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db: db,
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trie: tr,
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originalRoot: root,
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snaps: snaps,
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stateObjects: make(map[common.Address]*stateObject),
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stateObjectsPending: make(map[common.Address]struct{}),
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stateObjectsDirty: make(map[common.Address]struct{}),
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logs: make(map[common.Hash][]*types.Log),
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preimages: make(map[common.Hash][]byte),
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journal: newJournal(),
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accessList: newAccessList(),
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hasher: crypto.NewKeccakState(),
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}
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if sdb.snaps != nil {
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if sdb.snap = sdb.snaps.Snapshot(root); sdb.snap != nil {
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sdb.snapDestructs = make(map[common.Hash]struct{})
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sdb.snapAccounts = make(map[common.Hash][]byte)
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sdb.snapStorage = make(map[common.Hash]map[common.Hash][]byte)
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}
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}
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return sdb, nil
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}
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// StartPrefetcher initializes a new trie prefetcher to pull in nodes from the
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// state trie concurrently while the state is mutated so that when we reach the
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// commit phase, most of the needed data is already hot.
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func (s *StateDB) StartPrefetcher(namespace string) {
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if s.prefetcher != nil {
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s.prefetcher.close()
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s.prefetcher = nil
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}
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if s.snap != nil {
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s.prefetcher = newTriePrefetcher(s.db, s.originalRoot, namespace)
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}
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}
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// StopPrefetcher terminates a running prefetcher and reports any leftover stats
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// from the gathered metrics.
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func (s *StateDB) StopPrefetcher() {
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if s.prefetcher != nil {
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s.prefetcher.close()
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s.prefetcher = nil
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}
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}
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// setError remembers the first non-nil error it is called with.
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func (s *StateDB) setError(err error) {
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if s.dbErr == nil {
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s.dbErr = err
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}
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}
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func (s *StateDB) Error() error {
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return s.dbErr
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}
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func (s *StateDB) AddLog(log *types.Log) {
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s.journal.append(addLogChange{txhash: s.thash})
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log.TxHash = s.thash
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log.TxIndex = uint(s.txIndex)
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log.Index = s.logSize
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s.logs[s.thash] = append(s.logs[s.thash], log)
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s.logSize++
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}
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func (s *StateDB) GetLogs(hash common.Hash, blockHash common.Hash) []*types.Log {
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logs := s.logs[hash]
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for _, l := range logs {
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l.BlockHash = blockHash
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}
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return logs
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}
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func (s *StateDB) Logs() []*types.Log {
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var logs []*types.Log
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for _, lgs := range s.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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// AddPreimage records a SHA3 preimage seen by the VM.
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func (s *StateDB) AddPreimage(hash common.Hash, preimage []byte) {
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if _, ok := s.preimages[hash]; !ok {
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s.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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s.preimages[hash] = pi
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}
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}
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// Preimages returns a list of SHA3 preimages that have been submitted.
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func (s *StateDB) Preimages() map[common.Hash][]byte {
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return s.preimages
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}
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// AddRefund adds gas to the refund counter
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func (s *StateDB) AddRefund(gas uint64) {
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s.journal.append(refundChange{prev: s.refund})
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s.refund += gas
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}
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// SubRefund removes gas from the refund counter.
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// This method will panic if the refund counter goes below zero
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func (s *StateDB) SubRefund(gas uint64) {
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s.journal.append(refundChange{prev: s.refund})
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if gas > s.refund {
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panic(fmt.Sprintf("Refund counter below zero (gas: %d > refund: %d)", gas, s.refund))
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}
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s.refund -= gas
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}
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// Exist reports whether the given account address exists in the state.
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// Notably this also returns true for suicided accounts.
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func (s *StateDB) Exist(addr common.Address) bool {
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return s.getStateObject(addr) != nil
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}
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// Empty returns whether the state object is either non-existent
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// or empty according to the EIP161 specification (balance = nonce = code = 0)
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func (s *StateDB) Empty(addr common.Address) bool {
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so := s.getStateObject(addr)
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return so == nil || so.empty()
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}
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// GetBalance retrieves the balance from the given address or 0 if object not found
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func (s *StateDB) GetBalance(addr common.Address) *big.Int {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.Balance()
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}
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return common.Big0
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}
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func (s *StateDB) GetNonce(addr common.Address) uint64 {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.Nonce()
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}
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return 0
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}
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// TxIndex returns the current transaction index set by Prepare.
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func (s *StateDB) TxIndex() int {
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return s.txIndex
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}
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func (s *StateDB) GetCode(addr common.Address) []byte {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.Code(s.db)
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}
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return nil
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}
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func (s *StateDB) GetCodeSize(addr common.Address) int {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.CodeSize(s.db)
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}
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return 0
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}
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func (s *StateDB) GetCodeHash(addr common.Address) common.Hash {
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stateObject := s.getStateObject(addr)
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if stateObject == nil {
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return common.Hash{}
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}
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return common.BytesToHash(stateObject.CodeHash())
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}
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// GetState retrieves a value from the given account's storage trie.
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func (s *StateDB) GetState(addr common.Address, hash common.Hash) common.Hash {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.GetState(s.db, hash)
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}
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return common.Hash{}
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}
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// GetProof returns the Merkle proof for a given account.
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func (s *StateDB) GetProof(addr common.Address) ([][]byte, error) {
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return s.GetProofByHash(crypto.Keccak256Hash(addr.Bytes()))
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}
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// GetProofByHash returns the Merkle proof for a given account.
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func (s *StateDB) GetProofByHash(addrHash common.Hash) ([][]byte, error) {
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var proof proofList
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err := s.trie.Prove(addrHash[:], 0, &proof)
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return proof, err
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}
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// GetStorageProof returns the Merkle proof for given storage slot.
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func (s *StateDB) GetStorageProof(a common.Address, key common.Hash) ([][]byte, error) {
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var proof proofList
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trie := s.StorageTrie(a)
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if trie == nil {
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return proof, errors.New("storage trie for requested address does not exist")
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}
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err := trie.Prove(crypto.Keccak256(key.Bytes()), 0, &proof)
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return proof, err
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}
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// GetCommittedState retrieves a value from the given account's committed storage trie.
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func (s *StateDB) GetCommittedState(addr common.Address, hash common.Hash) common.Hash {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.GetCommittedState(s.db, hash)
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}
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return common.Hash{}
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}
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// Database retrieves the low level database supporting the lower level trie ops.
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func (s *StateDB) Database() Database {
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return s.db
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}
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// StorageTrie returns the storage trie of an account.
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// The return value is a copy and is nil for non-existent accounts.
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func (s *StateDB) StorageTrie(addr common.Address) Trie {
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stateObject := s.getStateObject(addr)
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if stateObject == nil {
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return nil
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}
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cpy := stateObject.deepCopy(s)
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cpy.updateTrie(s.db)
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return cpy.getTrie(s.db)
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}
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func (s *StateDB) HasSuicided(addr common.Address) bool {
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stateObject := s.getStateObject(addr)
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if stateObject != nil {
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return stateObject.suicided
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}
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return false
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}
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/*
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* SETTERS
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*/
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// AddBalance adds amount to the account associated with addr.
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func (s *StateDB) AddBalance(addr common.Address, amount *big.Int) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.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 (s *StateDB) SubBalance(addr common.Address, amount *big.Int) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SubBalance(amount)
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}
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}
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func (s *StateDB) SetBalance(addr common.Address, amount *big.Int) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetBalance(amount)
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}
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}
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func (s *StateDB) SetNonce(addr common.Address, nonce uint64) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetNonce(nonce)
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}
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}
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func (s *StateDB) SetCode(addr common.Address, code []byte) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetCode(crypto.Keccak256Hash(code), code)
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}
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}
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func (s *StateDB) SetState(addr common.Address, key, value common.Hash) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetState(s.db, key, value)
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}
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}
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// SetStorage replaces the entire storage for the specified account with given
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// storage. This function should only be used for debugging.
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func (s *StateDB) SetStorage(addr common.Address, storage map[common.Hash]common.Hash) {
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stateObject := s.GetOrNewStateObject(addr)
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if stateObject != nil {
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stateObject.SetStorage(storage)
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}
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}
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// Suicide marks the given account as suicided.
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// This 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 (s *StateDB) Suicide(addr common.Address) bool {
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stateObject := s.getStateObject(addr)
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if stateObject == nil {
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return false
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}
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s.journal.append(suicideChange{
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account: &addr,
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prev: stateObject.suicided,
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prevbalance: new(big.Int).Set(stateObject.Balance()),
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})
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stateObject.markSuicided()
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stateObject.data.Balance = new(big.Int)
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return true
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}
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//
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// Setting, updating & deleting state object methods.
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//
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// updateStateObject writes the given object to the trie.
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func (s *StateDB) updateStateObject(obj *stateObject) {
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// Track the amount of time wasted on updating the account from the trie
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if metrics.EnabledExpensive {
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defer func(start time.Time) { s.AccountUpdates += time.Since(start) }(time.Now())
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}
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// Encode the account and update the account trie
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addr := obj.Address()
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if err := s.trie.TryUpdateAccount(addr[:], &obj.data); err != nil {
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s.setError(fmt.Errorf("updateStateObject (%x) error: %v", addr[:], err))
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}
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// If state snapshotting is active, cache the data til commit. Note, this
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// update mechanism is not symmetric to the deletion, because whereas it is
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// enough to track account updates at commit time, deletions need tracking
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// at transaction boundary level to ensure we capture state clearing.
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if s.snap != nil {
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s.snapAccounts[obj.addrHash] = snapshot.SlimAccountRLP(obj.data.Nonce, obj.data.Balance, obj.data.Root, obj.data.CodeHash)
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}
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}
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// deleteStateObject removes the given object from the state trie.
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func (s *StateDB) deleteStateObject(obj *stateObject) {
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// Track the amount of time wasted on deleting the account from the trie
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if metrics.EnabledExpensive {
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defer func(start time.Time) { s.AccountUpdates += time.Since(start) }(time.Now())
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}
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// Delete the account from the trie
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addr := obj.Address()
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if err := s.trie.TryDeleteAccount(addr[:]); err != nil {
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s.setError(fmt.Errorf("deleteStateObject (%x) error: %v", addr[:], err))
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}
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}
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// getStateObject retrieves a state object given by the address, returning nil if
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// the object is not found or was deleted in this execution context. If you need
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// to differentiate between non-existent/just-deleted, use getDeletedStateObject.
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func (s *StateDB) getStateObject(addr common.Address) *stateObject {
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if obj := s.getDeletedStateObject(addr); obj != nil && !obj.deleted {
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return obj
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}
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return nil
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}
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// getDeletedStateObject is similar to getStateObject, but instead of returning
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// nil for a deleted state object, it returns the actual object with the deleted
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// flag set. This is needed by the state journal to revert to the correct s-
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// destructed object instead of wiping all knowledge about the state object.
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func (s *StateDB) getDeletedStateObject(addr common.Address) *stateObject {
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// Prefer live objects if any is available
|
|
if obj := s.stateObjects[addr]; obj != nil {
|
|
return obj
|
|
}
|
|
// If no live objects are available, attempt to use snapshots
|
|
var data *types.StateAccount
|
|
if s.snap != nil {
|
|
start := time.Now()
|
|
acc, err := s.snap.Account(crypto.HashData(s.hasher, addr.Bytes()))
|
|
if metrics.EnabledExpensive {
|
|
s.SnapshotAccountReads += time.Since(start)
|
|
}
|
|
if err == nil {
|
|
if acc == nil {
|
|
return nil
|
|
}
|
|
data = &types.StateAccount{
|
|
Nonce: acc.Nonce,
|
|
Balance: acc.Balance,
|
|
CodeHash: acc.CodeHash,
|
|
Root: common.BytesToHash(acc.Root),
|
|
}
|
|
if len(data.CodeHash) == 0 {
|
|
data.CodeHash = emptyCodeHash
|
|
}
|
|
if data.Root == (common.Hash{}) {
|
|
data.Root = emptyRoot
|
|
}
|
|
}
|
|
}
|
|
// If snapshot unavailable or reading from it failed, load from the database
|
|
if data == nil {
|
|
start := time.Now()
|
|
var err error
|
|
data, err = s.trie.TryGetAccount(addr.Bytes())
|
|
if metrics.EnabledExpensive {
|
|
s.AccountReads += time.Since(start)
|
|
}
|
|
if err != nil {
|
|
s.setError(fmt.Errorf("getDeleteStateObject (%x) error: %w", addr.Bytes(), err))
|
|
return nil
|
|
}
|
|
if data == nil {
|
|
return nil
|
|
}
|
|
}
|
|
// Insert into the live set
|
|
obj := newObject(s, addr, *data)
|
|
s.setStateObject(obj)
|
|
return obj
|
|
}
|
|
|
|
func (s *StateDB) setStateObject(object *stateObject) {
|
|
s.stateObjects[object.Address()] = object
|
|
}
|
|
|
|
// GetOrNewStateObject retrieves a state object or create a new state object if nil.
|
|
func (s *StateDB) GetOrNewStateObject(addr common.Address) *stateObject {
|
|
stateObject := s.getStateObject(addr)
|
|
if stateObject == nil {
|
|
stateObject, _ = s.createObject(addr)
|
|
}
|
|
return stateObject
|
|
}
|
|
|
|
// 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 (s *StateDB) createObject(addr common.Address) (newobj, prev *stateObject) {
|
|
prev = s.getDeletedStateObject(addr) // Note, prev might have been deleted, we need that!
|
|
|
|
var prevdestruct bool
|
|
if s.snap != nil && prev != nil {
|
|
_, prevdestruct = s.snapDestructs[prev.addrHash]
|
|
if !prevdestruct {
|
|
s.snapDestructs[prev.addrHash] = struct{}{}
|
|
}
|
|
}
|
|
newobj = newObject(s, addr, types.StateAccount{})
|
|
if prev == nil {
|
|
s.journal.append(createObjectChange{account: &addr})
|
|
} else {
|
|
s.journal.append(resetObjectChange{prev: prev, prevdestruct: prevdestruct})
|
|
}
|
|
s.setStateObject(newobj)
|
|
if prev != nil && !prev.deleted {
|
|
return newobj, prev
|
|
}
|
|
return newobj, nil
|
|
}
|
|
|
|
// CreateAccount explicitly creates a state object. If a state object with the address
|
|
// already exists the balance is carried over to the new account.
|
|
//
|
|
// CreateAccount is called during the EVM CREATE operation. The situation might arise that
|
|
// a contract does the following:
|
|
//
|
|
// 1. sends funds to sha(account ++ (nonce + 1))
|
|
// 2. tx_create(sha(account ++ nonce)) (note that this gets the address of 1)
|
|
//
|
|
// Carrying over the balance ensures that Ether doesn't disappear.
|
|
func (s *StateDB) CreateAccount(addr common.Address) {
|
|
newObj, prev := s.createObject(addr)
|
|
if prev != nil {
|
|
newObj.setBalance(prev.data.Balance)
|
|
}
|
|
}
|
|
|
|
func (db *StateDB) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool) error {
|
|
so := db.getStateObject(addr)
|
|
if so == nil {
|
|
return nil
|
|
}
|
|
it := trie.NewIterator(so.getTrie(db.db).NodeIterator(nil))
|
|
|
|
for it.Next() {
|
|
key := common.BytesToHash(db.trie.GetKey(it.Key))
|
|
if value, dirty := so.dirtyStorage[key]; dirty {
|
|
if !cb(key, value) {
|
|
return nil
|
|
}
|
|
continue
|
|
}
|
|
|
|
if len(it.Value) > 0 {
|
|
_, content, _, err := rlp.Split(it.Value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !cb(key, common.BytesToHash(content)) {
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Copy creates a deep, independent copy of the state.
|
|
// Snapshots of the copied state cannot be applied to the copy.
|
|
func (s *StateDB) Copy() *StateDB {
|
|
// Copy all the basic fields, initialize the memory ones
|
|
state := &StateDB{
|
|
db: s.db,
|
|
trie: s.db.CopyTrie(s.trie),
|
|
originalRoot: s.originalRoot,
|
|
stateObjects: make(map[common.Address]*stateObject, len(s.journal.dirties)),
|
|
stateObjectsPending: make(map[common.Address]struct{}, len(s.stateObjectsPending)),
|
|
stateObjectsDirty: make(map[common.Address]struct{}, len(s.journal.dirties)),
|
|
refund: s.refund,
|
|
logs: make(map[common.Hash][]*types.Log, len(s.logs)),
|
|
logSize: s.logSize,
|
|
preimages: make(map[common.Hash][]byte, len(s.preimages)),
|
|
journal: newJournal(),
|
|
hasher: crypto.NewKeccakState(),
|
|
}
|
|
// Copy the dirty states, logs, and preimages
|
|
for addr := range s.journal.dirties {
|
|
// As documented [here](https://github.com/ethereum/go-ethereum/pull/16485#issuecomment-380438527),
|
|
// and in the Finalise-method, there is a case where an object is in the journal but not
|
|
// in the stateObjects: OOG after touch on ripeMD prior to Byzantium. Thus, we need to check for
|
|
// nil
|
|
if object, exist := s.stateObjects[addr]; exist {
|
|
// Even though the original object is dirty, we are not copying the journal,
|
|
// so we need to make sure that any side-effect the journal would have caused
|
|
// during a commit (or similar op) is already applied to the copy.
|
|
state.stateObjects[addr] = object.deepCopy(state)
|
|
|
|
state.stateObjectsDirty[addr] = struct{}{} // Mark the copy dirty to force internal (code/state) commits
|
|
state.stateObjectsPending[addr] = struct{}{} // Mark the copy pending to force external (account) commits
|
|
}
|
|
}
|
|
// Above, we don't copy the actual journal. This means that if the copy is copied, the
|
|
// loop above will be a no-op, since the copy's journal is empty.
|
|
// Thus, here we iterate over stateObjects, to enable copies of copies
|
|
for addr := range s.stateObjectsPending {
|
|
if _, exist := state.stateObjects[addr]; !exist {
|
|
state.stateObjects[addr] = s.stateObjects[addr].deepCopy(state)
|
|
}
|
|
state.stateObjectsPending[addr] = struct{}{}
|
|
}
|
|
for addr := range s.stateObjectsDirty {
|
|
if _, exist := state.stateObjects[addr]; !exist {
|
|
state.stateObjects[addr] = s.stateObjects[addr].deepCopy(state)
|
|
}
|
|
state.stateObjectsDirty[addr] = struct{}{}
|
|
}
|
|
for hash, logs := range s.logs {
|
|
cpy := make([]*types.Log, len(logs))
|
|
for i, l := range logs {
|
|
cpy[i] = new(types.Log)
|
|
*cpy[i] = *l
|
|
}
|
|
state.logs[hash] = cpy
|
|
}
|
|
for hash, preimage := range s.preimages {
|
|
state.preimages[hash] = preimage
|
|
}
|
|
// Do we need to copy the access list? In practice: No. At the start of a
|
|
// transaction, the access list is empty. In practice, we only ever copy state
|
|
// _between_ transactions/blocks, never in the middle of a transaction.
|
|
// However, it doesn't cost us much to copy an empty list, so we do it anyway
|
|
// to not blow up if we ever decide copy it in the middle of a transaction
|
|
state.accessList = s.accessList.Copy()
|
|
|
|
// If there's a prefetcher running, make an inactive copy of it that can
|
|
// only access data but does not actively preload (since the user will not
|
|
// know that they need to explicitly terminate an active copy).
|
|
if s.prefetcher != nil {
|
|
state.prefetcher = s.prefetcher.copy()
|
|
}
|
|
if s.snaps != nil {
|
|
// In order for the miner to be able to use and make additions
|
|
// to the snapshot tree, we need to copy that aswell.
|
|
// Otherwise, any block mined by ourselves will cause gaps in the tree,
|
|
// and force the miner to operate trie-backed only
|
|
state.snaps = s.snaps
|
|
state.snap = s.snap
|
|
// deep copy needed
|
|
state.snapDestructs = make(map[common.Hash]struct{})
|
|
for k, v := range s.snapDestructs {
|
|
state.snapDestructs[k] = v
|
|
}
|
|
state.snapAccounts = make(map[common.Hash][]byte)
|
|
for k, v := range s.snapAccounts {
|
|
state.snapAccounts[k] = v
|
|
}
|
|
state.snapStorage = make(map[common.Hash]map[common.Hash][]byte)
|
|
for k, v := range s.snapStorage {
|
|
temp := make(map[common.Hash][]byte)
|
|
for kk, vv := range v {
|
|
temp[kk] = vv
|
|
}
|
|
state.snapStorage[k] = temp
|
|
}
|
|
}
|
|
return state
|
|
}
|
|
|
|
// Snapshot returns an identifier for the current revision of the state.
|
|
func (s *StateDB) Snapshot() int {
|
|
id := s.nextRevisionId
|
|
s.nextRevisionId++
|
|
s.validRevisions = append(s.validRevisions, revision{id, s.journal.length()})
|
|
return id
|
|
}
|
|
|
|
// RevertToSnapshot reverts all state changes made since the given revision.
|
|
func (s *StateDB) RevertToSnapshot(revid int) {
|
|
// Find the snapshot in the stack of valid snapshots.
|
|
idx := sort.Search(len(s.validRevisions), func(i int) bool {
|
|
return s.validRevisions[i].id >= revid
|
|
})
|
|
if idx == len(s.validRevisions) || s.validRevisions[idx].id != revid {
|
|
panic(fmt.Errorf("revision id %v cannot be reverted", revid))
|
|
}
|
|
snapshot := s.validRevisions[idx].journalIndex
|
|
|
|
// Replay the journal to undo changes and remove invalidated snapshots
|
|
s.journal.revert(s, snapshot)
|
|
s.validRevisions = s.validRevisions[:idx]
|
|
}
|
|
|
|
// GetRefund returns the current value of the refund counter.
|
|
func (s *StateDB) GetRefund() uint64 {
|
|
return s.refund
|
|
}
|
|
|
|
// Finalise finalises the state by removing the destructed objects and clears
|
|
// the journal as well as the refunds. Finalise, however, will not push any updates
|
|
// into the tries just yet. Only IntermediateRoot or Commit will do that.
|
|
func (s *StateDB) Finalise(deleteEmptyObjects bool) {
|
|
addressesToPrefetch := make([][]byte, 0, len(s.journal.dirties))
|
|
for addr := range s.journal.dirties {
|
|
obj, exist := s.stateObjects[addr]
|
|
if !exist {
|
|
// ripeMD is 'touched' at block 1714175, in tx 0x1237f737031e40bcde4a8b7e717b2d15e3ecadfe49bb1bbc71ee9deb09c6fcf2
|
|
// That tx goes out of gas, and although the notion of 'touched' does not exist there, the
|
|
// touch-event will still be recorded in the journal. Since ripeMD is a special snowflake,
|
|
// it will persist in the journal even though the journal is reverted. In this special circumstance,
|
|
// it may exist in `s.journal.dirties` but not in `s.stateObjects`.
|
|
// Thus, we can safely ignore it here
|
|
continue
|
|
}
|
|
if obj.suicided || (deleteEmptyObjects && obj.empty()) {
|
|
obj.deleted = true
|
|
|
|
// If state snapshotting is active, also mark the destruction there.
|
|
// Note, we can't do this only at the end of a block because multiple
|
|
// transactions within the same block might self destruct and then
|
|
// resurrect an account; but the snapshotter needs both events.
|
|
if s.snap != nil {
|
|
s.snapDestructs[obj.addrHash] = struct{}{} // We need to maintain account deletions explicitly (will remain set indefinitely)
|
|
delete(s.snapAccounts, obj.addrHash) // Clear out any previously updated account data (may be recreated via a resurrect)
|
|
delete(s.snapStorage, obj.addrHash) // Clear out any previously updated storage data (may be recreated via a resurrect)
|
|
}
|
|
} else {
|
|
obj.finalise(true) // Prefetch slots in the background
|
|
}
|
|
s.stateObjectsPending[addr] = struct{}{}
|
|
s.stateObjectsDirty[addr] = struct{}{}
|
|
|
|
// At this point, also ship the address off to the precacher. The precacher
|
|
// will start loading tries, and when the change is eventually committed,
|
|
// the commit-phase will be a lot faster
|
|
addressesToPrefetch = append(addressesToPrefetch, common.CopyBytes(addr[:])) // Copy needed for closure
|
|
}
|
|
if s.prefetcher != nil && len(addressesToPrefetch) > 0 {
|
|
s.prefetcher.prefetch(common.Hash{}, s.originalRoot, addressesToPrefetch)
|
|
}
|
|
// Invalidate journal because reverting across transactions is not allowed.
|
|
s.clearJournalAndRefund()
|
|
}
|
|
|
|
// IntermediateRoot computes the current root hash of the state trie.
|
|
// It is called in between transactions to get the root hash that
|
|
// goes into transaction receipts.
|
|
func (s *StateDB) IntermediateRoot(deleteEmptyObjects bool) common.Hash {
|
|
// Finalise all the dirty storage states and write them into the tries
|
|
s.Finalise(deleteEmptyObjects)
|
|
|
|
// If there was a trie prefetcher operating, it gets aborted and irrevocably
|
|
// modified after we start retrieving tries. Remove it from the statedb after
|
|
// this round of use.
|
|
//
|
|
// This is weird pre-byzantium since the first tx runs with a prefetcher and
|
|
// the remainder without, but pre-byzantium even the initial prefetcher is
|
|
// useless, so no sleep lost.
|
|
prefetcher := s.prefetcher
|
|
if s.prefetcher != nil {
|
|
defer func() {
|
|
s.prefetcher.close()
|
|
s.prefetcher = nil
|
|
}()
|
|
}
|
|
// Although naively it makes sense to retrieve the account trie and then do
|
|
// the contract storage and account updates sequentially, that short circuits
|
|
// the account prefetcher. Instead, let's process all the storage updates
|
|
// first, giving the account prefetches just a few more milliseconds of time
|
|
// to pull useful data from disk.
|
|
for addr := range s.stateObjectsPending {
|
|
if obj := s.stateObjects[addr]; !obj.deleted {
|
|
obj.updateRoot(s.db)
|
|
}
|
|
}
|
|
// Now we're about to start to write changes to the trie. The trie is so far
|
|
// _untouched_. We can check with the prefetcher, if it can give us a trie
|
|
// which has the same root, but also has some content loaded into it.
|
|
if prefetcher != nil {
|
|
if trie := prefetcher.trie(common.Hash{}, s.originalRoot); trie != nil {
|
|
s.trie = trie
|
|
}
|
|
}
|
|
usedAddrs := make([][]byte, 0, len(s.stateObjectsPending))
|
|
for addr := range s.stateObjectsPending {
|
|
if obj := s.stateObjects[addr]; obj.deleted {
|
|
s.deleteStateObject(obj)
|
|
s.AccountDeleted += 1
|
|
} else {
|
|
s.updateStateObject(obj)
|
|
s.AccountUpdated += 1
|
|
}
|
|
usedAddrs = append(usedAddrs, common.CopyBytes(addr[:])) // Copy needed for closure
|
|
}
|
|
if prefetcher != nil {
|
|
prefetcher.used(common.Hash{}, s.originalRoot, usedAddrs)
|
|
}
|
|
if len(s.stateObjectsPending) > 0 {
|
|
s.stateObjectsPending = make(map[common.Address]struct{})
|
|
}
|
|
// Track the amount of time wasted on hashing the account trie
|
|
if metrics.EnabledExpensive {
|
|
defer func(start time.Time) { s.AccountHashes += time.Since(start) }(time.Now())
|
|
}
|
|
return s.trie.Hash()
|
|
}
|
|
|
|
// Prepare sets the current transaction hash and index which are
|
|
// used when the EVM emits new state logs.
|
|
func (s *StateDB) Prepare(thash common.Hash, ti int) {
|
|
s.thash = thash
|
|
s.txIndex = ti
|
|
}
|
|
|
|
func (s *StateDB) clearJournalAndRefund() {
|
|
if len(s.journal.entries) > 0 {
|
|
s.journal = newJournal()
|
|
s.refund = 0
|
|
}
|
|
s.validRevisions = s.validRevisions[:0] // Snapshots can be created without journal entries
|
|
}
|
|
|
|
// Commit writes the state to the underlying in-memory trie database.
|
|
func (s *StateDB) Commit(deleteEmptyObjects bool) (common.Hash, error) {
|
|
if s.dbErr != nil {
|
|
return common.Hash{}, fmt.Errorf("commit aborted due to earlier error: %v", s.dbErr)
|
|
}
|
|
// Finalize any pending changes and merge everything into the tries
|
|
s.IntermediateRoot(deleteEmptyObjects)
|
|
|
|
// Commit objects to the trie, measuring the elapsed time
|
|
var (
|
|
accountTrieNodesUpdated int
|
|
accountTrieNodesDeleted int
|
|
storageTrieNodesUpdated int
|
|
storageTrieNodesDeleted int
|
|
nodes = trie.NewMergedNodeSet()
|
|
)
|
|
codeWriter := s.db.DiskDB().NewBatch()
|
|
for addr := range s.stateObjectsDirty {
|
|
if obj := s.stateObjects[addr]; !obj.deleted {
|
|
// Write any contract code associated with the state object
|
|
if obj.code != nil && obj.dirtyCode {
|
|
rawdb.WriteCode(codeWriter, common.BytesToHash(obj.CodeHash()), obj.code)
|
|
obj.dirtyCode = false
|
|
}
|
|
// Write any storage changes in the state object to its storage trie
|
|
set, err := obj.commitTrie(s.db)
|
|
if err != nil {
|
|
return common.Hash{}, err
|
|
}
|
|
// Merge the dirty nodes of storage trie into global set
|
|
if set != nil {
|
|
if err := nodes.Merge(set); err != nil {
|
|
return common.Hash{}, err
|
|
}
|
|
updates, deleted := set.Size()
|
|
storageTrieNodesUpdated += updates
|
|
storageTrieNodesDeleted += deleted
|
|
}
|
|
}
|
|
// If the contract is destructed, the storage is still left in the
|
|
// database as dangling data. Theoretically it's should be wiped from
|
|
// database as well, but in hash-based-scheme it's extremely hard to
|
|
// determine that if the trie nodes are also referenced by other storage,
|
|
// and in path-based-scheme some technical challenges are still unsolved.
|
|
// Although it won't affect the correctness but please fix it TODO(rjl493456442).
|
|
}
|
|
if len(s.stateObjectsDirty) > 0 {
|
|
s.stateObjectsDirty = make(map[common.Address]struct{})
|
|
}
|
|
if codeWriter.ValueSize() > 0 {
|
|
if err := codeWriter.Write(); err != nil {
|
|
log.Crit("Failed to commit dirty codes", "error", err)
|
|
}
|
|
}
|
|
// Write the account trie changes, measuring the amount of wasted time
|
|
var start time.Time
|
|
if metrics.EnabledExpensive {
|
|
start = time.Now()
|
|
}
|
|
root, set, err := s.trie.Commit(true)
|
|
if err != nil {
|
|
return common.Hash{}, err
|
|
}
|
|
// Merge the dirty nodes of account trie into global set
|
|
if set != nil {
|
|
if err := nodes.Merge(set); err != nil {
|
|
return common.Hash{}, err
|
|
}
|
|
accountTrieNodesUpdated, accountTrieNodesDeleted = set.Size()
|
|
}
|
|
if metrics.EnabledExpensive {
|
|
s.AccountCommits += time.Since(start)
|
|
|
|
accountUpdatedMeter.Mark(int64(s.AccountUpdated))
|
|
storageUpdatedMeter.Mark(int64(s.StorageUpdated))
|
|
accountDeletedMeter.Mark(int64(s.AccountDeleted))
|
|
storageDeletedMeter.Mark(int64(s.StorageDeleted))
|
|
accountTrieUpdatedMeter.Mark(int64(accountTrieNodesUpdated))
|
|
accountTrieDeletedMeter.Mark(int64(accountTrieNodesDeleted))
|
|
storageTriesUpdatedMeter.Mark(int64(storageTrieNodesUpdated))
|
|
storageTriesDeletedMeter.Mark(int64(storageTrieNodesDeleted))
|
|
s.AccountUpdated, s.AccountDeleted = 0, 0
|
|
s.StorageUpdated, s.StorageDeleted = 0, 0
|
|
}
|
|
// If snapshotting is enabled, update the snapshot tree with this new version
|
|
if s.snap != nil {
|
|
start := time.Now()
|
|
// Only update if there's a state transition (skip empty Clique blocks)
|
|
if parent := s.snap.Root(); parent != root {
|
|
if err := s.snaps.Update(root, parent, s.snapDestructs, s.snapAccounts, s.snapStorage); err != nil {
|
|
log.Warn("Failed to update snapshot tree", "from", parent, "to", root, "err", err)
|
|
}
|
|
// Keep 128 diff layers in the memory, persistent layer is 129th.
|
|
// - head layer is paired with HEAD state
|
|
// - head-1 layer is paired with HEAD-1 state
|
|
// - head-127 layer(bottom-most diff layer) is paired with HEAD-127 state
|
|
if err := s.snaps.Cap(root, 128); err != nil {
|
|
log.Warn("Failed to cap snapshot tree", "root", root, "layers", 128, "err", err)
|
|
}
|
|
}
|
|
if metrics.EnabledExpensive {
|
|
s.SnapshotCommits += time.Since(start)
|
|
}
|
|
s.snap, s.snapDestructs, s.snapAccounts, s.snapStorage = nil, nil, nil, nil
|
|
}
|
|
if root == (common.Hash{}) {
|
|
root = emptyRoot
|
|
}
|
|
origin := s.originalRoot
|
|
if origin == (common.Hash{}) {
|
|
origin = emptyRoot
|
|
}
|
|
if root != origin {
|
|
start := time.Now()
|
|
if err := s.db.TrieDB().Update(nodes); err != nil {
|
|
return common.Hash{}, err
|
|
}
|
|
s.originalRoot = root
|
|
if metrics.EnabledExpensive {
|
|
s.TrieDBCommits += time.Since(start)
|
|
}
|
|
}
|
|
return root, nil
|
|
}
|
|
|
|
// 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 Berlin/2929+2930 is applicable at the current number.
|
|
func (s *StateDB) PrepareAccessList(sender common.Address, dst *common.Address, precompiles []common.Address, list types.AccessList) {
|
|
// Clear out any leftover from previous executions
|
|
s.accessList = newAccessList()
|
|
|
|
s.AddAddressToAccessList(sender)
|
|
if dst != nil {
|
|
s.AddAddressToAccessList(*dst)
|
|
// If it's a create-tx, the destination will be added inside evm.create
|
|
}
|
|
for _, addr := range precompiles {
|
|
s.AddAddressToAccessList(addr)
|
|
}
|
|
for _, el := range list {
|
|
s.AddAddressToAccessList(el.Address)
|
|
for _, key := range el.StorageKeys {
|
|
s.AddSlotToAccessList(el.Address, key)
|
|
}
|
|
}
|
|
}
|
|
|
|
// AddAddressToAccessList adds the given address to the access list
|
|
func (s *StateDB) AddAddressToAccessList(addr common.Address) {
|
|
if s.accessList.AddAddress(addr) {
|
|
s.journal.append(accessListAddAccountChange{&addr})
|
|
}
|
|
}
|
|
|
|
// AddSlotToAccessList adds the given (address, slot)-tuple to the access list
|
|
func (s *StateDB) AddSlotToAccessList(addr common.Address, slot common.Hash) {
|
|
addrMod, slotMod := s.accessList.AddSlot(addr, slot)
|
|
if addrMod {
|
|
// In practice, this should not happen, since there is no way to enter the
|
|
// scope of 'address' without having the 'address' become already added
|
|
// to the access list (via call-variant, create, etc).
|
|
// Better safe than sorry, though
|
|
s.journal.append(accessListAddAccountChange{&addr})
|
|
}
|
|
if slotMod {
|
|
s.journal.append(accessListAddSlotChange{
|
|
address: &addr,
|
|
slot: &slot,
|
|
})
|
|
}
|
|
}
|
|
|
|
// AddressInAccessList returns true if the given address is in the access list.
|
|
func (s *StateDB) AddressInAccessList(addr common.Address) bool {
|
|
return s.accessList.ContainsAddress(addr)
|
|
}
|
|
|
|
// SlotInAccessList returns true if the given (address, slot)-tuple is in the access list.
|
|
func (s *StateDB) SlotInAccessList(addr common.Address, slot common.Hash) (addressPresent bool, slotPresent bool) {
|
|
return s.accessList.Contains(addr, slot)
|
|
}
|