plugeth/trie/triedb/pathdb/journal.go

388 lines
13 KiB
Go

// 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 pathdb
import (
"bytes"
"errors"
"fmt"
"io"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie/trienode"
"github.com/ethereum/go-ethereum/trie/triestate"
)
var (
errMissJournal = errors.New("journal not found")
errMissVersion = errors.New("version not found")
errUnexpectedVersion = errors.New("unexpected journal version")
errMissDiskRoot = errors.New("disk layer root not found")
errUnmatchedJournal = errors.New("unmatched journal")
)
const journalVersion uint64 = 0
// journalNode represents a trie node persisted in the journal.
type journalNode struct {
Path []byte // Path of the node in the trie
Blob []byte // RLP-encoded trie node blob, nil means the node is deleted
}
// journalNodes represents a list trie nodes belong to a single account
// or the main account trie.
type journalNodes struct {
Owner common.Hash
Nodes []journalNode
}
// journalAccounts represents a list accounts belong to the layer.
type journalAccounts struct {
Addresses []common.Address
Accounts [][]byte
}
// journalStorage represents a list of storage slots belong to an account.
type journalStorage struct {
Incomplete bool
Account common.Address
Hashes []common.Hash
Slots [][]byte
}
// loadJournal tries to parse the layer journal from the disk.
func (db *Database) loadJournal(diskRoot common.Hash) (layer, error) {
journal := rawdb.ReadTrieJournal(db.diskdb)
if len(journal) == 0 {
return nil, errMissJournal
}
r := rlp.NewStream(bytes.NewReader(journal), 0)
// Firstly, resolve the first element as the journal version
version, err := r.Uint64()
if err != nil {
return nil, errMissVersion
}
if version != journalVersion {
return nil, fmt.Errorf("%w want %d got %d", errUnexpectedVersion, journalVersion, version)
}
// Secondly, resolve the disk layer root, ensure it's continuous
// with disk layer. Note now we can ensure it's the layer journal
// correct version, so we expect everything can be resolved properly.
var root common.Hash
if err := r.Decode(&root); err != nil {
return nil, errMissDiskRoot
}
// The journal is not matched with persistent state, discard them.
// It can happen that geth crashes without persisting the journal.
if !bytes.Equal(root.Bytes(), diskRoot.Bytes()) {
return nil, fmt.Errorf("%w want %x got %x", errUnmatchedJournal, root, diskRoot)
}
// Load the disk layer from the journal
base, err := db.loadDiskLayer(r)
if err != nil {
return nil, err
}
// Load all the diff layers from the journal
head, err := db.loadDiffLayer(base, r)
if err != nil {
return nil, err
}
log.Debug("Loaded layer journal", "diskroot", diskRoot, "diffhead", head.rootHash())
return head, nil
}
// loadLayers loads a pre-existing state layer backed by a key-value store.
func (db *Database) loadLayers() layer {
// Retrieve the root node of persistent state.
_, root := rawdb.ReadAccountTrieNode(db.diskdb, nil)
root = types.TrieRootHash(root)
// Load the layers by resolving the journal
head, err := db.loadJournal(root)
if err == nil {
return head
}
// journal is not matched(or missing) with the persistent state, discard
// it. Display log for discarding journal, but try to avoid showing
// useless information when the db is created from scratch.
if !(root == types.EmptyRootHash && errors.Is(err, errMissJournal)) {
log.Info("Failed to load journal, discard it", "err", err)
}
// Return single layer with persistent state.
return newDiskLayer(root, rawdb.ReadPersistentStateID(db.diskdb), db, nil, newNodeBuffer(db.bufferSize, nil, 0))
}
// loadDiskLayer reads the binary blob from the layer journal, reconstructing
// a new disk layer on it.
func (db *Database) loadDiskLayer(r *rlp.Stream) (layer, error) {
// Resolve disk layer root
var root common.Hash
if err := r.Decode(&root); err != nil {
return nil, fmt.Errorf("load disk root: %v", err)
}
// Resolve the state id of disk layer, it can be different
// with the persistent id tracked in disk, the id distance
// is the number of transitions aggregated in disk layer.
var id uint64
if err := r.Decode(&id); err != nil {
return nil, fmt.Errorf("load state id: %v", err)
}
stored := rawdb.ReadPersistentStateID(db.diskdb)
if stored > id {
return nil, fmt.Errorf("invalid state id: stored %d resolved %d", stored, id)
}
// Resolve nodes cached in node buffer
var encoded []journalNodes
if err := r.Decode(&encoded); err != nil {
return nil, fmt.Errorf("load disk nodes: %v", err)
}
nodes := make(map[common.Hash]map[string]*trienode.Node)
for _, entry := range encoded {
subset := make(map[string]*trienode.Node)
for _, n := range entry.Nodes {
if len(n.Blob) > 0 {
subset[string(n.Path)] = trienode.New(crypto.Keccak256Hash(n.Blob), n.Blob)
} else {
subset[string(n.Path)] = trienode.NewDeleted()
}
}
nodes[entry.Owner] = subset
}
// Calculate the internal state transitions by id difference.
base := newDiskLayer(root, id, db, nil, newNodeBuffer(db.bufferSize, nodes, id-stored))
return base, nil
}
// loadDiffLayer reads the next sections of a layer journal, reconstructing a new
// diff and verifying that it can be linked to the requested parent.
func (db *Database) loadDiffLayer(parent layer, r *rlp.Stream) (layer, error) {
// Read the next diff journal entry
var root common.Hash
if err := r.Decode(&root); err != nil {
// The first read may fail with EOF, marking the end of the journal
if err == io.EOF {
return parent, nil
}
return nil, fmt.Errorf("load diff root: %v", err)
}
var block uint64
if err := r.Decode(&block); err != nil {
return nil, fmt.Errorf("load block number: %v", err)
}
// Read in-memory trie nodes from journal
var encoded []journalNodes
if err := r.Decode(&encoded); err != nil {
return nil, fmt.Errorf("load diff nodes: %v", err)
}
nodes := make(map[common.Hash]map[string]*trienode.Node)
for _, entry := range encoded {
subset := make(map[string]*trienode.Node)
for _, n := range entry.Nodes {
if len(n.Blob) > 0 {
subset[string(n.Path)] = trienode.New(crypto.Keccak256Hash(n.Blob), n.Blob)
} else {
subset[string(n.Path)] = trienode.NewDeleted()
}
}
nodes[entry.Owner] = subset
}
// Read state changes from journal
var (
jaccounts journalAccounts
jstorages []journalStorage
accounts = make(map[common.Address][]byte)
storages = make(map[common.Address]map[common.Hash][]byte)
incomplete = make(map[common.Address]struct{})
)
if err := r.Decode(&jaccounts); err != nil {
return nil, fmt.Errorf("load diff accounts: %v", err)
}
for i, addr := range jaccounts.Addresses {
accounts[addr] = jaccounts.Accounts[i]
}
if err := r.Decode(&jstorages); err != nil {
return nil, fmt.Errorf("load diff storages: %v", err)
}
for _, entry := range jstorages {
set := make(map[common.Hash][]byte)
for i, h := range entry.Hashes {
if len(entry.Slots[i]) > 0 {
set[h] = entry.Slots[i]
} else {
set[h] = nil
}
}
if entry.Incomplete {
incomplete[entry.Account] = struct{}{}
}
storages[entry.Account] = set
}
return db.loadDiffLayer(newDiffLayer(parent, root, parent.stateID()+1, block, nodes, triestate.New(accounts, storages, incomplete)), r)
}
// journal implements the layer interface, marshaling the un-flushed trie nodes
// along with layer meta data into provided byte buffer.
func (dl *diskLayer) journal(w io.Writer) error {
dl.lock.RLock()
defer dl.lock.RUnlock()
// Ensure the layer didn't get stale
if dl.stale {
return errSnapshotStale
}
// Step one, write the disk root into the journal.
if err := rlp.Encode(w, dl.root); err != nil {
return err
}
// Step two, write the corresponding state id into the journal
if err := rlp.Encode(w, dl.id); err != nil {
return err
}
// Step three, write all unwritten nodes into the journal
nodes := make([]journalNodes, 0, len(dl.buffer.nodes))
for owner, subset := range dl.buffer.nodes {
entry := journalNodes{Owner: owner}
for path, node := range subset {
entry.Nodes = append(entry.Nodes, journalNode{Path: []byte(path), Blob: node.Blob})
}
nodes = append(nodes, entry)
}
if err := rlp.Encode(w, nodes); err != nil {
return err
}
log.Debug("Journaled pathdb disk layer", "root", dl.root, "nodes", len(dl.buffer.nodes))
return nil
}
// journal implements the layer interface, writing the memory layer contents
// into a buffer to be stored in the database as the layer journal.
func (dl *diffLayer) journal(w io.Writer) error {
dl.lock.RLock()
defer dl.lock.RUnlock()
// journal the parent first
if err := dl.parent.journal(w); err != nil {
return err
}
// Everything below was journaled, persist this layer too
if err := rlp.Encode(w, dl.root); err != nil {
return err
}
if err := rlp.Encode(w, dl.block); err != nil {
return err
}
// Write the accumulated trie nodes into buffer
nodes := make([]journalNodes, 0, len(dl.nodes))
for owner, subset := range dl.nodes {
entry := journalNodes{Owner: owner}
for path, node := range subset {
entry.Nodes = append(entry.Nodes, journalNode{Path: []byte(path), Blob: node.Blob})
}
nodes = append(nodes, entry)
}
if err := rlp.Encode(w, nodes); err != nil {
return err
}
// Write the accumulated state changes into buffer
var jacct journalAccounts
for addr, account := range dl.states.Accounts {
jacct.Addresses = append(jacct.Addresses, addr)
jacct.Accounts = append(jacct.Accounts, account)
}
if err := rlp.Encode(w, jacct); err != nil {
return err
}
storage := make([]journalStorage, 0, len(dl.states.Storages))
for addr, slots := range dl.states.Storages {
entry := journalStorage{Account: addr}
if _, ok := dl.states.Incomplete[addr]; ok {
entry.Incomplete = true
}
for slotHash, slot := range slots {
entry.Hashes = append(entry.Hashes, slotHash)
entry.Slots = append(entry.Slots, slot)
}
storage = append(storage, entry)
}
if err := rlp.Encode(w, storage); err != nil {
return err
}
log.Debug("Journaled pathdb diff layer", "root", dl.root, "parent", dl.parent.rootHash(), "id", dl.stateID(), "block", dl.block, "nodes", len(dl.nodes))
return nil
}
// Journal commits an entire diff hierarchy to disk into a single journal entry.
// This is meant to be used during shutdown to persist the layer without
// flattening everything down (bad for reorgs). And this function will mark the
// database as read-only to prevent all following mutation to disk.
func (db *Database) Journal(root common.Hash) error {
// Retrieve the head layer to journal from.
l := db.tree.get(root)
if l == nil {
return fmt.Errorf("triedb layer [%#x] missing", root)
}
disk := db.tree.bottom()
if l, ok := l.(*diffLayer); ok {
log.Info("Persisting dirty state to disk", "head", l.block, "root", root, "layers", l.id-disk.id+disk.buffer.layers)
} else { // disk layer only on noop runs (likely) or deep reorgs (unlikely)
log.Info("Persisting dirty state to disk", "root", root, "layers", disk.buffer.layers)
}
start := time.Now()
// Run the journaling
db.lock.Lock()
defer db.lock.Unlock()
// Short circuit if the database is in read only mode.
if db.readOnly {
return errSnapshotReadOnly
}
// Firstly write out the metadata of journal
journal := new(bytes.Buffer)
if err := rlp.Encode(journal, journalVersion); err != nil {
return err
}
// The stored state in disk might be empty, convert the
// root to emptyRoot in this case.
_, diskroot := rawdb.ReadAccountTrieNode(db.diskdb, nil)
diskroot = types.TrieRootHash(diskroot)
// Secondly write out the state root in disk, ensure all layers
// on top are continuous with disk.
if err := rlp.Encode(journal, diskroot); err != nil {
return err
}
// Finally write out the journal of each layer in reverse order.
if err := l.journal(journal); err != nil {
return err
}
// Store the journal into the database and return
rawdb.WriteTrieJournal(db.diskdb, journal.Bytes())
// Set the db in read only mode to reject all following mutations
db.readOnly = true
log.Info("Persisted dirty state to disk", "size", common.StorageSize(journal.Len()), "elapsed", common.PrettyDuration(time.Since(start)))
return nil
}