core: drop dangerous methods from blockchainer.StateRoot

CleanStorage and UpdateStateValidators should only be availabe to appropriate
core modules.

pkg/core/blockchain.go

@@ -928,7 +928,7 @@ func (bc *Blockchain) GetStateModule() blockchainer.StateRoot {
 
 // GetStateSyncModule returns new state sync service instance.
 func (bc *Blockchain) GetStateSyncModule() *statesync.Module {
-	return statesync.NewModule(bc, bc.log, bc.dao, bc.jumpToState)
+	return statesync.NewModule(bc, bc.stateRoot, bc.log, bc.dao, bc.jumpToState)
 }
 
 // storeBlock performs chain update using the block given, it executes all

pkg/core/blockchainer/state_root.go

@@ -10,7 +10,6 @@ import (
 // StateRoot represents local state root module.
 type StateRoot interface {
 	AddStateRoot(root *state.MPTRoot) error
-	CleanStorage() error
 	CurrentLocalHeight() uint32
 	CurrentLocalStateRoot() util.Uint256
 	CurrentValidatedHeight() uint32
@@ -20,5 +19,4 @@ type StateRoot interface {
 	GetStateRoot(height uint32) (*state.MPTRoot, error)
 	GetStateValidators(height uint32) keys.PublicKeys
 	SetUpdateValidatorsCallback(func(uint32, keys.PublicKeys))
-	UpdateStateValidators(height uint32, pubs keys.PublicKeys)
 }

pkg/core/native/designate.go

@@ -8,7 +8,6 @@ import (
 	"sort"
 	"sync/atomic"
 
-	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer/services"
 	"github.com/nspcc-dev/neo-go/pkg/core/dao"
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
@@ -16,6 +15,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
 	"github.com/nspcc-dev/neo-go/pkg/core/native/noderoles"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/core/stateroot"
 	"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"
@@ -43,7 +43,7 @@ type Designate struct {
 	// NotaryService represents Notary node module.
 	NotaryService atomic.Value
 	// StateRootService represents StateRoot node module.
-	StateRootService blockchainer.StateRoot
+	StateRootService *stateroot.Module
 }
 
 type roleData struct {

pkg/core/statesync/module.go

@@ -25,9 +25,9 @@ import (
 
 	"github.com/nspcc-dev/neo-go/pkg/config"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
-	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/dao"
 	"github.com/nspcc-dev/neo-go/pkg/core/mpt"
+	"github.com/nspcc-dev/neo-go/pkg/core/stateroot"
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -67,7 +67,6 @@ type Ledger interface {
 	GetConfig() config.ProtocolConfiguration
 	GetHeader(hash util.Uint256) (*block.Header, error)
 	GetHeaderHash(int) util.Uint256
-	GetStateModule() blockchainer.StateRoot
 	HeaderHeight() uint32
 }
 
@@ -88,6 +87,7 @@ type Module struct {
 
 	dao      *dao.Simple
 	bc       Ledger
+	stateMod *stateroot.Module
 	mptpool  *Pool
 
 	billet *mpt.Billet
@@ -96,17 +96,19 @@ type Module struct {
 }
 
 // NewModule returns new instance of statesync module.
-func NewModule(bc Ledger, log *zap.Logger, s *dao.Simple, jumpCallback func(p uint32) error) *Module {
+func NewModule(bc Ledger, stateMod *stateroot.Module, log *zap.Logger, s *dao.Simple, jumpCallback func(p uint32) error) *Module {
 	if !(bc.GetConfig().P2PStateExchangeExtensions && bc.GetConfig().RemoveUntraceableBlocks) {
 		return &Module{
 			dao:       s,
 			bc:        bc,
+			stateMod:  stateMod,
 			syncStage: inactive,
 		}
 	}
 	return &Module{
 		dao:          s,
 		bc:           bc,
+		stateMod:     stateMod,
 		log:          log,
 		syncInterval: uint32(bc.GetConfig().StateSyncInterval),
 		mptpool:      NewPool(),
@@ -158,7 +160,7 @@ func (s *Module) Init(currChainHeight uint32) error {
 		// current chain's state until new state is completely fetched, outdated state-related data
 		// will be removed from storage during (*Blockchain).jumpToState(...) execution.
 		// All we need to do right now is to remove genesis-related MPT nodes.
-		err = s.bc.GetStateModule().CleanStorage()
+		err = s.stateMod.CleanStorage()
 		if err != nil {
 			return fmt.Errorf("failed to remove outdated MPT data from storage: %w", err)
 		}
@@ -213,7 +215,7 @@ func (s *Module) defineSyncStage() error {
 	if s.blockHeight > s.syncPoint {
 		s.syncStage |= mptSynced
 		s.log.Info("MPT is in sync",
-			zap.Uint32("stateroot height", s.bc.GetStateModule().CurrentLocalHeight()))
+			zap.Uint32("stateroot height", s.stateMod.CurrentLocalHeight()))
 	} else if s.syncStage&headersSynced != 0 {
 		header, err := s.bc.GetHeader(s.bc.GetHeaderHash(int(s.syncPoint + 1)))
 		if err != nil {