neoneo-go/pkg/core/stateroot/module.go
2022-11-10 18:08:17 +03:00

350 lines
10 KiB
Go

package stateroot
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"sync"
"time"
"github.com/nspcc-dev/neo-go/pkg/config"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/core/mpt"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"go.uber.org/atomic"
"go.uber.org/zap"
)
type (
// VerifierFunc is a function that allows to check witness of account
// for Hashable item with GAS limit.
VerifierFunc func(util.Uint160, hash.Hashable, *transaction.Witness, int64) (int64, error)
// Module represents module for local processing of state roots.
Module struct {
Store *storage.MemCachedStore
network netmode.Magic
srInHead bool
mode mpt.TrieMode
mpt *mpt.Trie
verifier VerifierFunc
log *zap.Logger
currentLocal atomic.Value
localHeight atomic.Uint32
validatedHeight atomic.Uint32
mtx sync.RWMutex
keys []keyCache
updateValidatorsCb func(height uint32, publicKeys keys.PublicKeys)
}
keyCache struct {
height uint32
validatorsKeys keys.PublicKeys
validatorsHash util.Uint160
validatorsScript []byte
}
)
// NewModule returns new instance of stateroot module.
func NewModule(cfg config.ProtocolConfiguration, verif VerifierFunc, log *zap.Logger, s *storage.MemCachedStore) *Module {
var mode mpt.TrieMode
if cfg.KeepOnlyLatestState {
mode |= mpt.ModeLatest
}
if cfg.RemoveUntraceableBlocks {
mode |= mpt.ModeGC
}
return &Module{
network: cfg.Magic,
srInHead: cfg.StateRootInHeader,
mode: mode,
verifier: verif,
log: log,
Store: s,
}
}
// GetState returns value at the specified key fom the MPT with the specified root.
func (s *Module) GetState(root util.Uint256, key []byte) ([]byte, error) {
// Allow accessing old values, it's RO thing.
tr := mpt.NewTrie(mpt.NewHashNode(root), s.mode&^mpt.ModeGCFlag, storage.NewMemCachedStore(s.Store))
return tr.Get(key)
}
// FindStates returns set of key-value pairs with key matching the prefix starting
// from the `prefix`+`start` path from MPT trie with the specified root. `max` is
// the maximum number of elements to be returned. If nil `start` specified, then
// item with key equals to prefix is included into result; if empty `start` specified,
// then item with key equals to prefix is not included into result.
func (s *Module) FindStates(root util.Uint256, prefix, start []byte, max int) ([]storage.KeyValue, error) {
// Allow accessing old values, it's RO thing.
tr := mpt.NewTrie(mpt.NewHashNode(root), s.mode&^mpt.ModeGCFlag, storage.NewMemCachedStore(s.Store))
return tr.Find(prefix, start, max)
}
// GetStateProof returns proof of having key in the MPT with the specified root.
func (s *Module) GetStateProof(root util.Uint256, key []byte) ([][]byte, error) {
// Allow accessing old values, it's RO thing.
tr := mpt.NewTrie(mpt.NewHashNode(root), s.mode&^mpt.ModeGCFlag, storage.NewMemCachedStore(s.Store))
return tr.GetProof(key)
}
// GetStateRoot returns state root for a given height.
func (s *Module) GetStateRoot(height uint32) (*state.MPTRoot, error) {
return s.getStateRoot(makeStateRootKey(height))
}
// GetLatestStateHeight returns the latest blockchain height by the given stateroot.
func (s *Module) GetLatestStateHeight(root util.Uint256) (uint32, error) {
rootBytes := root.BytesBE()
rootStartOffset := 1 + 4 // stateroot version (1 byte) + stateroot index (4 bytes)
rootEndOffset := rootStartOffset + util.Uint256Size
var (
h uint32
found bool
rootKey = makeStateRootKey(s.localHeight.Load())
)
s.Store.Seek(storage.SeekRange{
Prefix: []byte{rootKey[0]}, // DataMPTAux
Start: rootKey[1:], // Start is a value that should be appended to the Prefix
Backwards: true,
}, func(k, v []byte) bool {
if len(k) == 5 && bytes.Equal(v[rootStartOffset:rootEndOffset], rootBytes) {
h = binary.BigEndian.Uint32(k[1:]) // cut prefix DataMPTAux
found = true
return false
}
return true
})
if found {
return h, nil
}
return h, storage.ErrKeyNotFound
}
// CurrentLocalStateRoot returns hash of the local state root.
func (s *Module) CurrentLocalStateRoot() util.Uint256 {
return s.currentLocal.Load().(util.Uint256)
}
// CurrentLocalHeight returns height of the local state root.
func (s *Module) CurrentLocalHeight() uint32 {
return s.localHeight.Load()
}
// CurrentValidatedHeight returns current state root validated height.
func (s *Module) CurrentValidatedHeight() uint32 {
return s.validatedHeight.Load()
}
// Init initializes state root module at the given height.
func (s *Module) Init(height uint32) error {
data, err := s.Store.Get([]byte{byte(storage.DataMPTAux), prefixValidated})
if err == nil {
s.validatedHeight.Store(binary.LittleEndian.Uint32(data))
}
if height == 0 {
s.mpt = mpt.NewTrie(nil, s.mode, s.Store)
s.currentLocal.Store(util.Uint256{})
return nil
}
r, err := s.getStateRoot(makeStateRootKey(height))
if err != nil {
return err
}
s.currentLocal.Store(r.Root)
s.localHeight.Store(r.Index)
s.mpt = mpt.NewTrie(mpt.NewHashNode(r.Root), s.mode, s.Store)
return nil
}
// CleanStorage removes all MPT-related data from the storage (MPT nodes, validated stateroots)
// except local stateroot for the current height and GC flag. This method is aimed to clean
// outdated MPT data before state sync process can be started.
// Note: this method is aimed to be called for genesis block only, an error is returned otherwise.
func (s *Module) CleanStorage() error {
if s.localHeight.Load() != 0 {
return fmt.Errorf("can't clean MPT data for non-genesis block: expected local stateroot height 0, got %d", s.localHeight.Load())
}
b := storage.NewMemCachedStore(s.Store)
s.Store.Seek(storage.SeekRange{Prefix: []byte{byte(storage.DataMPT)}}, func(k, _ []byte) bool {
// #1468, but don't need to copy here, because it is done by Store.
b.Delete(k)
return true
})
_, err := b.Persist()
if err != nil {
return fmt.Errorf("failed to remove outdated MPT-reated items: %w", err)
}
return nil
}
// JumpToState performs jump to the state specified by given stateroot index.
func (s *Module) JumpToState(sr *state.MPTRoot) {
s.addLocalStateRoot(s.Store, sr)
data := make([]byte, 4)
binary.LittleEndian.PutUint32(data, sr.Index)
s.Store.Put([]byte{byte(storage.DataMPTAux), prefixValidated}, data)
s.validatedHeight.Store(sr.Index)
s.currentLocal.Store(sr.Root)
s.localHeight.Store(sr.Index)
s.mpt = mpt.NewTrie(mpt.NewHashNode(sr.Root), s.mode, s.Store)
}
// ResetState resets MPT state to the given height.
func (s *Module) ResetState(height uint32, cache *storage.MemCachedStore) error {
// Update local stateroot.
sr, err := s.GetStateRoot(height)
if err != nil {
return fmt.Errorf("failed to retrieve state root for height %d: %w", height, err)
}
s.addLocalStateRoot(cache, sr)
// Remove all stateroots newer than the given height.
srKey := makeStateRootKey(height)
var srSeen bool
cache.Seek(storage.SeekRange{
Prefix: srKey[0:1],
Start: srKey[1:5],
Backwards: false,
}, func(k, v []byte) bool {
if len(k) == 5 {
if srSeen {
cache.Delete(k)
} else if bytes.Equal(k, srKey) {
srSeen = true
}
}
return true
})
// Retrieve the most recent validated stateroot before the given height.
witnessesLenOffset := 1 /* version */ + 4 /* index */ + smartcontract.Hash256Len /* root */
var validated *uint32
cache.Seek(storage.SeekRange{
Prefix: srKey[0:1],
Start: srKey[1:5],
Backwards: true,
}, func(k, v []byte) bool {
if len(k) == 5 {
if len(v) > witnessesLenOffset && v[witnessesLenOffset] != 0 {
i := binary.BigEndian.Uint32(k[1:])
validated = &i
return false
}
}
return true
})
if validated != nil {
validatedBytes := make([]byte, 4)
binary.LittleEndian.PutUint32(validatedBytes, *validated)
cache.Put([]byte{byte(storage.DataMPTAux), prefixValidated}, validatedBytes)
s.validatedHeight.Store(*validated)
} else {
cache.Delete([]byte{byte(storage.DataMPTAux), prefixValidated})
}
s.currentLocal.Store(sr.Root)
s.localHeight.Store(sr.Index)
s.mpt = mpt.NewTrie(mpt.NewHashNode(sr.Root), s.mode, s.Store)
// Do not reset MPT nodes, leave the trie state itself as is.
return nil
}
// GC performs garbage collection.
func (s *Module) GC(index uint32, store storage.Store) time.Duration {
if !s.mode.GC() {
panic("stateroot: GC invoked, but not enabled")
}
var removed int
var stored int64
s.log.Info("starting MPT garbage collection", zap.Uint32("index", index))
start := time.Now()
err := store.SeekGC(storage.SeekRange{
Prefix: []byte{byte(storage.DataMPT)},
}, func(k, v []byte) bool {
stored++
if !mpt.IsActiveValue(v) {
h := binary.LittleEndian.Uint32(v[len(v)-4:])
if h <= index {
removed++
stored--
return false
}
}
return true
})
dur := time.Since(start)
if err != nil {
s.log.Error("failed to flush MPT GC changeset", zap.Duration("time", dur), zap.Error(err))
} else {
s.log.Info("finished MPT garbage collection",
zap.Int("removed", removed),
zap.Int64("kept", stored),
zap.Duration("time", dur))
}
return dur
}
// AddMPTBatch updates using provided batch.
func (s *Module) AddMPTBatch(index uint32, b mpt.Batch, cache *storage.MemCachedStore) (*mpt.Trie, *state.MPTRoot, error) {
mpt := *s.mpt
mpt.Store = cache
if _, err := mpt.PutBatch(b); err != nil {
return nil, nil, err
}
mpt.Flush(index)
sr := &state.MPTRoot{
Index: index,
Root: mpt.StateRoot(),
}
s.addLocalStateRoot(cache, sr)
return &mpt, sr, nil
}
// UpdateCurrentLocal updates local caches using provided state root.
func (s *Module) UpdateCurrentLocal(mpt *mpt.Trie, sr *state.MPTRoot) {
s.mpt = mpt
s.currentLocal.Store(sr.Root)
s.localHeight.Store(sr.Index)
if s.srInHead {
s.validatedHeight.Store(sr.Index)
updateStateHeightMetric(sr.Index)
}
}
// VerifyStateRoot checks if state root is valid.
func (s *Module) VerifyStateRoot(r *state.MPTRoot) error {
_, err := s.getStateRoot(makeStateRootKey(r.Index - 1))
if err != nil {
return errors.New("can't get previous state root")
}
if len(r.Witness) != 1 {
return errors.New("no witness")
}
return s.verifyWitness(r)
}
const maxVerificationGAS = 2_00000000
// verifyWitness verifies state root witness.
func (s *Module) verifyWitness(r *state.MPTRoot) error {
s.mtx.Lock()
h := s.getKeyCacheForHeight(r.Index).validatorsHash
s.mtx.Unlock()
_, err := s.verifier(h, r, &r.Witness[0], maxVerificationGAS)
return err
}