package native import ( "encoding/binary" "errors" "fmt" "math" "math/big" "sort" "sync/atomic" "github.com/nspcc-dev/neo-go/pkg/core/dao" "github.com/nspcc-dev/neo-go/pkg/core/interop" "github.com/nspcc-dev/neo-go/pkg/core/interop/runtime" "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/stateroot" "github.com/nspcc-dev/neo-go/pkg/core/storage" "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/smartcontract/callflag" "github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // Designate represents a designation contract. type Designate struct { interop.ContractMD NEO *NEO // p2pSigExtensionsEnabled defines whether the P2P signature extensions logic is relevant. p2pSigExtensionsEnabled bool OracleService atomic.Value // NotaryService represents a Notary node module. NotaryService atomic.Value // StateRootService represents a StateRoot node module. StateRootService *stateroot.Module } type roleData struct { nodes keys.PublicKeys addr util.Uint160 height uint32 } type DesignationCache struct { // rolesChangedFlag shows whether any of designated nodes were changed within the current block. // It is used to notify dependant services about updated node roles during PostPersist. rolesChangedFlag bool oracles roleData stateVals roleData neofsAlphabet roleData notaries roleData } const ( designateContractID = -8 // maxNodeCount is the maximum number of nodes to set the role for. maxNodeCount = 32 // DesignationEventName is the name of the designation event. DesignationEventName = "Designation" ) // Various errors. var ( ErrAlreadyDesignated = errors.New("already designated given role at current block") ErrEmptyNodeList = errors.New("node list is empty") ErrInvalidIndex = errors.New("invalid index") ErrInvalidRole = errors.New("invalid role") ErrLargeNodeList = errors.New("node list is too large") ErrNoBlock = errors.New("no persisting block in the context") ) var ( _ interop.Contract = (*Designate)(nil) _ dao.NativeContractCache = (*DesignationCache)(nil) ) // Copy implements NativeContractCache interface. func (c *DesignationCache) Copy() dao.NativeContractCache { cp := &DesignationCache{} copyDesignationCache(c, cp) return cp } func copyDesignationCache(src, dst *DesignationCache) { *dst = *src } func (s *Designate) isValidRole(r noderoles.Role) bool { return r == noderoles.Oracle || r == noderoles.StateValidator || r == noderoles.NeoFSAlphabet || (s.p2pSigExtensionsEnabled && r == noderoles.P2PNotary) } func newDesignate(p2pSigExtensionsEnabled bool) *Designate { s := &Designate{ContractMD: *interop.NewContractMD(nativenames.Designation, designateContractID)} s.p2pSigExtensionsEnabled = p2pSigExtensionsEnabled defer s.UpdateHash() desc := newDescriptor("getDesignatedByRole", smartcontract.ArrayType, manifest.NewParameter("role", smartcontract.IntegerType), manifest.NewParameter("index", smartcontract.IntegerType)) md := newMethodAndPrice(s.getDesignatedByRole, 1<<15, callflag.ReadStates) s.AddMethod(md, desc) desc = newDescriptor("designateAsRole", smartcontract.VoidType, manifest.NewParameter("role", smartcontract.IntegerType), manifest.NewParameter("nodes", smartcontract.ArrayType)) md = newMethodAndPrice(s.designateAsRole, 1<<15, callflag.States|callflag.AllowNotify) s.AddMethod(md, desc) s.AddEvent(DesignationEventName, manifest.NewParameter("Role", smartcontract.IntegerType), manifest.NewParameter("BlockIndex", smartcontract.IntegerType)) return s } // Initialize initializes Designation contract. It is called once at native Management's OnPersist // at the genesis block, and we can't properly fill the cache at this point, as there are no roles // data in the storage. func (s *Designate) Initialize(ic *interop.Context) error { cache := &DesignationCache{} ic.DAO.SetCache(s.ID, cache) return nil } // InitializeCache fills native Designate cache from DAO. It is called at non-zero height, thus // we can fetch the roles data right from the storage. func (s *Designate) InitializeCache(d *dao.Simple) error { cache := &DesignationCache{} roles := []noderoles.Role{noderoles.Oracle, noderoles.NeoFSAlphabet, noderoles.StateValidator} if s.p2pSigExtensionsEnabled { roles = append(roles, noderoles.P2PNotary) } for _, r := range roles { err := s.updateCachedRoleData(cache, d, r) if err != nil { return fmt.Errorf("failed to get nodes from storage for %d role: %w", r, err) } } d.SetCache(s.ID, cache) return nil } // OnPersist implements the Contract interface. func (s *Designate) OnPersist(ic *interop.Context) error { return nil } // PostPersist implements the Contract interface. func (s *Designate) PostPersist(ic *interop.Context) error { cache := ic.DAO.GetRWCache(s.ID).(*DesignationCache) if !cache.rolesChangedFlag { return nil } s.notifyRoleChanged(&cache.oracles, noderoles.Oracle) s.notifyRoleChanged(&cache.stateVals, noderoles.StateValidator) s.notifyRoleChanged(&cache.neofsAlphabet, noderoles.NeoFSAlphabet) if s.p2pSigExtensionsEnabled { s.notifyRoleChanged(&cache.notaries, noderoles.P2PNotary) } cache.rolesChangedFlag = false return nil } // Metadata returns contract metadata. func (s *Designate) Metadata() *interop.ContractMD { return &s.ContractMD } func (s *Designate) getDesignatedByRole(ic *interop.Context, args []stackitem.Item) stackitem.Item { r, ok := s.getRole(args[0]) if !ok { panic(ErrInvalidRole) } ind, err := args[1].TryInteger() if err != nil || !ind.IsUint64() { panic(ErrInvalidIndex) } index := ind.Uint64() if index > uint64(ic.BlockHeight()+1) { panic(ErrInvalidIndex) } pubs, _, err := s.GetDesignatedByRole(ic.DAO, r, uint32(index)) if err != nil { panic(err) } return pubsToArray(pubs) } func (s *Designate) hashFromNodes(r noderoles.Role, nodes keys.PublicKeys) util.Uint160 { if len(nodes) == 0 { return util.Uint160{} } var script []byte switch r { case noderoles.P2PNotary: script, _ = smartcontract.CreateMultiSigRedeemScript(1, nodes.Copy()) default: script, _ = smartcontract.CreateDefaultMultiSigRedeemScript(nodes.Copy()) } return hash.Hash160(script) } // updateCachedRoleData fetches the most recent role data from the storage and // updates the given cache. func (s *Designate) updateCachedRoleData(cache *DesignationCache, d *dao.Simple, r noderoles.Role) error { var v *roleData switch r { case noderoles.Oracle: v = &cache.oracles case noderoles.StateValidator: v = &cache.stateVals case noderoles.NeoFSAlphabet: v = &cache.neofsAlphabet case noderoles.P2PNotary: v = &cache.notaries } nodeKeys, height, err := s.getDesignatedByRoleFromStorage(d, r, math.MaxUint32) if err != nil { return err } v.nodes = nodeKeys v.addr = s.hashFromNodes(r, nodeKeys) v.height = height cache.rolesChangedFlag = true return nil } func (s *Designate) notifyRoleChanged(v *roleData, r noderoles.Role) { switch r { case noderoles.Oracle: if orc, _ := s.OracleService.Load().(*OracleService); orc != nil && *orc != nil { (*orc).UpdateOracleNodes(v.nodes.Copy()) } case noderoles.P2PNotary: if ntr, _ := s.NotaryService.Load().(*NotaryService); ntr != nil && *ntr != nil { (*ntr).UpdateNotaryNodes(v.nodes.Copy()) } case noderoles.StateValidator: if s.StateRootService != nil { s.StateRootService.UpdateStateValidators(v.height, v.nodes.Copy()) } } } func getCachedRoleData(cache *DesignationCache, r noderoles.Role) *roleData { switch r { case noderoles.Oracle: return &cache.oracles case noderoles.StateValidator: return &cache.stateVals case noderoles.NeoFSAlphabet: return &cache.neofsAlphabet case noderoles.P2PNotary: return &cache.notaries } return nil } // GetLastDesignatedHash returns the last designated hash of the given role. func (s *Designate) GetLastDesignatedHash(d *dao.Simple, r noderoles.Role) (util.Uint160, error) { if !s.isValidRole(r) { return util.Uint160{}, ErrInvalidRole } cache := d.GetROCache(s.ID).(*DesignationCache) if val := getCachedRoleData(cache, r); val != nil { return val.addr, nil } return util.Uint160{}, nil } // GetDesignatedByRole returns nodes for role r. func (s *Designate) GetDesignatedByRole(d *dao.Simple, r noderoles.Role, index uint32) (keys.PublicKeys, uint32, error) { if !s.isValidRole(r) { return nil, 0, ErrInvalidRole } cache := d.GetROCache(s.ID).(*DesignationCache) if val := getCachedRoleData(cache, r); val != nil { if val.height <= index { return val.nodes.Copy(), val.height, nil } } else { // Cache is always valid, thus if there's no cache then there's no designated nodes for this role. return nil, 0, nil } // Cache stores only latest designated nodes, so if the old info is requested, then we still need // to search in the storage. return s.getDesignatedByRoleFromStorage(d, r, index) } // getDesignatedByRoleFromStorage returns nodes for role r from the storage. func (s *Designate) getDesignatedByRoleFromStorage(d *dao.Simple, r noderoles.Role, index uint32) (keys.PublicKeys, uint32, error) { var ( ns NodeList bestIndex uint32 resVal []byte start = make([]byte, 4) ) binary.BigEndian.PutUint32(start, index) d.Seek(s.ID, storage.SeekRange{ Prefix: []byte{byte(r)}, Start: start, Backwards: true, }, func(k, v []byte) bool { bestIndex = binary.BigEndian.Uint32(k) // If len(k) < 4 the DB is broken and it deserves a panic. resVal = v // Take just the latest item, it's the one we need. return false }) if resVal != nil { err := stackitem.DeserializeConvertible(resVal, &ns) if err != nil { return nil, 0, err } } return keys.PublicKeys(ns), bestIndex, nil } func (s *Designate) designateAsRole(ic *interop.Context, args []stackitem.Item) stackitem.Item { r, ok := s.getRole(args[0]) if !ok { panic(ErrInvalidRole) } var ns NodeList if err := ns.FromStackItem(args[1]); err != nil { panic(err) } err := s.DesignateAsRole(ic, r, keys.PublicKeys(ns)) if err != nil { panic(err) } return stackitem.Null{} } // DesignateAsRole sets nodes for role r. func (s *Designate) DesignateAsRole(ic *interop.Context, r noderoles.Role, pubs keys.PublicKeys) error { length := len(pubs) if length == 0 { return ErrEmptyNodeList } if length > maxNodeCount { return ErrLargeNodeList } if !s.isValidRole(r) { return ErrInvalidRole } h := s.NEO.GetCommitteeAddress(ic.DAO) if ok, err := runtime.CheckHashedWitness(ic, h); err != nil || !ok { return ErrInvalidWitness } if ic.Block == nil { return ErrNoBlock } var key = make([]byte, 5) key[0] = byte(r) binary.BigEndian.PutUint32(key[1:], ic.Block.Index+1) si := ic.DAO.GetStorageItem(s.ID, key) if si != nil { return ErrAlreadyDesignated } sort.Sort(pubs) nl := NodeList(pubs) err := putConvertibleToDAO(s.ID, ic.DAO, key, &nl) if err != nil { return err } cache := ic.DAO.GetRWCache(s.ID).(*DesignationCache) err = s.updateCachedRoleData(cache, ic.DAO, r) if err != nil { return fmt.Errorf("failed to update Designation role data cache: %w", err) } ic.AddNotification(s.Hash, DesignationEventName, stackitem.NewArray([]stackitem.Item{ stackitem.NewBigInteger(big.NewInt(int64(r))), stackitem.NewBigInteger(big.NewInt(int64(ic.Block.Index))), })) return nil } func (s *Designate) getRole(item stackitem.Item) (noderoles.Role, bool) { bi, err := item.TryInteger() if err != nil { return 0, false } if !bi.IsUint64() { return 0, false } u := bi.Uint64() return noderoles.Role(u), u <= math.MaxUint8 && s.isValidRole(noderoles.Role(u)) }