neo-go/pkg/core/stateroot/module.go

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package stateroot
import (
"encoding/binary"
"errors"
"fmt"
"sync"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
"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/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/util"
"go.uber.org/atomic"
"go.uber.org/zap"
)
type (
// Module represents module for local processing of state roots.
Module struct {
Store *storage.MemCachedStore
network netmode.Magic
mpt *mpt.Trie
bc blockchainer.Blockchainer
log *zap.Logger
currentLocal atomic.Value
localHeight atomic.Uint32
validatedHeight atomic.Uint32
mtx sync.RWMutex
keys []keyCache
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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(bc blockchainer.Blockchainer, log *zap.Logger, s *storage.MemCachedStore) *Module {
return &Module{
network: bc.GetConfig().Magic,
bc: bc,
log: log,
Store: s,
}
}
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// 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) {
tr := mpt.NewTrie(mpt.NewHashNode(root), false, 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) {
tr := mpt.NewTrie(mpt.NewHashNode(root), false, 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) {
tr := mpt.NewTrie(mpt.NewHashNode(root), false, 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))
}
// 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, enableRefCount bool) error {
data, err := s.Store.Get([]byte{byte(storage.DataMPT), prefixValidated})
if err == nil {
s.validatedHeight.Store(binary.LittleEndian.Uint32(data))
}
if height == 0 {
s.mpt = mpt.NewTrie(nil, enableRefCount, 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), enableRefCount, 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 otherwice.
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 := s.Store.Batch()
s.Store.Seek([]byte{byte(storage.DataMPT)}, func(k, _ []byte) {
// #1468, but don't need to copy here, because it is done by Store.
b.Delete(k)
})
err := s.Store.PutBatch(b)
if err != nil {
return fmt.Errorf("failed to remove outdated MPT-reated items: %w", err)
}
currentLocal := s.currentLocal.Load().(util.Uint256)
if !currentLocal.Equals(util.Uint256{}) {
err := s.addLocalStateRoot(s.Store, &state.MPTRoot{
Index: s.localHeight.Load(),
Root: currentLocal,
})
if err != nil {
return fmt.Errorf("failed to store current local stateroot: %w", err)
}
}
return nil
}
// JumpToState performs jump to the state specified by given stateroot index.
func (s *Module) JumpToState(sr *state.MPTRoot, enableRefCount bool) error {
if err := s.addLocalStateRoot(s.Store, sr); err != nil {
return fmt.Errorf("failed to store local state root: %w", err)
}
data := make([]byte, 4)
binary.LittleEndian.PutUint32(data, sr.Index)
if err := s.Store.Put([]byte{byte(storage.DataMPT), prefixValidated}, data); err != nil {
return fmt.Errorf("failed to store validated height: %w", err)
}
s.validatedHeight.Store(sr.Index)
s.currentLocal.Store(sr.Root)
s.localHeight.Store(sr.Index)
s.mpt = mpt.NewTrie(mpt.NewHashNode(sr.Root), enableRefCount, s.Store)
return nil
}
// 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()
sr := &state.MPTRoot{
Index: index,
Root: mpt.StateRoot(),
}
err := s.addLocalStateRoot(cache, sr)
if err != nil {
return nil, nil, err
}
return &mpt, sr, err
}
// 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.bc.GetConfig().StateRootInHeader {
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.bc.VerifyWitness(h, r, &r.Witness[0], maxVerificationGAS)
return err
}