Official Go implementation of the Ethereum protocol
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go-ethereum/trie/database.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package trie
import (
"errors"
"github.com/VictoriaMetrics/fastcache"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/trie/triedb/hashdb"
"github.com/ethereum/go-ethereum/trie/trienode"
"github.com/ethereum/go-ethereum/trie/triestate"
)
// Config defines all necessary options for database.
type Config struct {
Cache int // Memory allowance (MB) to use for caching trie nodes in memory
Preimages bool // Flag whether the preimage of trie key is recorded
// Testing hooks
OnCommit func(states *triestate.Set) // Hook invoked when commit is performed
}
// backend defines the methods needed to access/update trie nodes in different
// state scheme.
type backend interface {
// Scheme returns the identifier of used storage scheme.
Scheme() string
// Initialized returns an indicator if the state data is already initialized
// according to the state scheme.
Initialized(genesisRoot common.Hash) bool
// Size returns the current storage size of the memory cache in front of the
// persistent database layer.
Size() common.StorageSize
// Update performs a state transition by committing dirty nodes contained
// in the given set in order to update state from the specified parent to
// the specified root.
Update(root common.Hash, parent common.Hash, nodes *trienode.MergedNodeSet) error
// Commit writes all relevant trie nodes belonging to the specified state
// to disk. Report specifies whether logs will be displayed in info level.
Commit(root common.Hash, report bool) error
// Close closes the trie database backend and releases all held resources.
Close() error
}
// Database is the wrapper of the underlying backend which is shared by different
// types of node backend as an entrypoint. It's responsible for all interactions
// relevant with trie nodes and node preimages.
type Database struct {
config *Config // Configuration for trie database
diskdb ethdb.Database // Persistent database to store the snapshot
cleans *fastcache.Cache // Megabytes permitted using for read caches
preimages *preimageStore // The store for caching preimages
backend backend // The backend for managing trie nodes
}
// prepare initializes the database with provided configs, but the
// database backend is still left as nil.
func prepare(diskdb ethdb.Database, config *Config) *Database {
var cleans *fastcache.Cache
if config != nil && config.Cache > 0 {
cleans = fastcache.New(config.Cache * 1024 * 1024)
}
var preimages *preimageStore
if config != nil && config.Preimages {
preimages = newPreimageStore(diskdb)
}
return &Database{
config: config,
diskdb: diskdb,
cleans: cleans,
preimages: preimages,
}
}
// NewDatabase initializes the trie database with default settings, namely
// the legacy hash-based scheme is used by default.
func NewDatabase(diskdb ethdb.Database) *Database {
return NewDatabaseWithConfig(diskdb, nil)
}
// NewDatabaseWithConfig initializes the trie database with provided configs.
// The path-based scheme is not activated yet, always initialized with legacy
// hash-based scheme by default.
func NewDatabaseWithConfig(diskdb ethdb.Database, config *Config) *Database {
db := prepare(diskdb, config)
db.backend = hashdb.New(diskdb, db.cleans, mptResolver{})
return db
}
// Reader returns a reader for accessing all trie nodes with provided state root.
// An error will be returned if the requested state is not available.
func (db *Database) Reader(blockRoot common.Hash) (Reader, error) {
return db.backend.(*hashdb.Database).Reader(blockRoot)
}
// Update performs a state transition by committing dirty nodes contained in the
// given set in order to update state from the specified parent to the specified
// root. The held pre-images accumulated up to this point will be flushed in case
// the size exceeds the threshold.
func (db *Database) Update(root common.Hash, parent common.Hash, nodes *trienode.MergedNodeSet, states *triestate.Set) error {
if db.config != nil && db.config.OnCommit != nil {
db.config.OnCommit(states)
}
if db.preimages != nil {
db.preimages.commit(false)
}
return db.backend.Update(root, parent, nodes)
}
// Commit iterates over all the children of a particular node, writes them out
// to disk. As a side effect, all pre-images accumulated up to this point are
// also written.
func (db *Database) Commit(root common.Hash, report bool) error {
if db.preimages != nil {
db.preimages.commit(true)
}
return db.backend.Commit(root, report)
}
// Size returns the storage size of dirty trie nodes in front of the persistent
// database and the size of cached preimages.
func (db *Database) Size() (common.StorageSize, common.StorageSize) {
var (
storages common.StorageSize
preimages common.StorageSize
)
storages = db.backend.Size()
if db.preimages != nil {
preimages = db.preimages.size()
}
return storages, preimages
}
// Initialized returns an indicator if the state data is already initialized
// according to the state scheme.
func (db *Database) Initialized(genesisRoot common.Hash) bool {
return db.backend.Initialized(genesisRoot)
}
// Scheme returns the node scheme used in the database.
func (db *Database) Scheme() string {
return db.backend.Scheme()
}
// Close flushes the dangling preimages to disk and closes the trie database.
// It is meant to be called when closing the blockchain object, so that all
// resources held can be released correctly.
func (db *Database) Close() error {
db.WritePreimages()
return db.backend.Close()
}
// WritePreimages flushes all accumulated preimages to disk forcibly.
func (db *Database) WritePreimages() {
if db.preimages != nil {
db.preimages.commit(true)
}
}
// Cap iteratively flushes old but still referenced trie nodes until the total
// memory usage goes below the given threshold. The held pre-images accumulated
// up to this point will be flushed in case the size exceeds the threshold.
//
// It's only supported by hash-based database and will return an error for others.
func (db *Database) Cap(limit common.StorageSize) error {
hdb, ok := db.backend.(*hashdb.Database)
if !ok {
return errors.New("not supported")
}
if db.preimages != nil {
db.preimages.commit(false)
}
return hdb.Cap(limit)
}
// Reference adds a new reference from a parent node to a child node. This function
// is used to add reference between internal trie node and external node(e.g. storage
// trie root), all internal trie nodes are referenced together by database itself.
//
// It's only supported by hash-based database and will return an error for others.
func (db *Database) Reference(root common.Hash, parent common.Hash) error {
hdb, ok := db.backend.(*hashdb.Database)
if !ok {
return errors.New("not supported")
}
hdb.Reference(root, parent)
return nil
}
// Dereference removes an existing reference from a root node. It's only
// supported by hash-based database and will return an error for others.
func (db *Database) Dereference(root common.Hash) error {
hdb, ok := db.backend.(*hashdb.Database)
if !ok {
return errors.New("not supported")
}
hdb.Dereference(root)
return nil
}
// Node retrieves the rlp-encoded node blob with provided node hash. It's
// only supported by hash-based database and will return an error for others.
// Note, this function should be deprecated once ETH66 is deprecated.
func (db *Database) Node(hash common.Hash) ([]byte, error) {
hdb, ok := db.backend.(*hashdb.Database)
if !ok {
return nil, errors.New("not supported")
}
return hdb.Node(hash)
}