package native import ( "encoding/binary" "errors" "math" "math/big" "sort" "sync/atomic" "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" "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/state" "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 designation contract. type Designate struct { interop.ContractMD NEO *NEO rolesChangedFlag atomic.Value oracles atomic.Value stateVals atomic.Value neofsAlphabet atomic.Value notaries atomic.Value // p2pSigExtensionsEnabled defines whether the P2P signature extensions logic is relevant. p2pSigExtensionsEnabled bool OracleService atomic.Value // NotaryService represents Notary node module. NotaryService atomic.Value // StateRootService represents StateRoot node module. StateRootService *stateroot.Module } type roleData struct { nodes keys.PublicKeys addr util.Uint160 height uint32 } const ( designateContractID = -8 // maxNodeCount is the maximum number of nodes to set the role for. maxNodeCount = 32 // DesignationEventName is the name of a 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") ) 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 Oracle contract. func (s *Designate) Initialize(ic *interop.Context) error { return nil } // OnPersist implements Contract interface. func (s *Designate) OnPersist(ic *interop.Context) error { return nil } // PostPersist implements Contract interface. func (s *Designate) PostPersist(ic *interop.Context) error { if !s.rolesChanged() { return nil } if err := s.updateCachedRoleData(&s.oracles, ic.DAO, noderoles.Oracle); err != nil { return err } if err := s.updateCachedRoleData(&s.stateVals, ic.DAO, noderoles.StateValidator); err != nil { return err } if err := s.updateCachedRoleData(&s.neofsAlphabet, ic.DAO, noderoles.NeoFSAlphabet); err != nil { return err } if s.p2pSigExtensionsEnabled { if err := s.updateCachedRoleData(&s.notaries, ic.DAO, noderoles.P2PNotary); err != nil { return err } } s.rolesChangedFlag.Store(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.Chain.BlockHeight()+1) { panic(ErrInvalidIndex) } pubs, _, err := s.GetDesignatedByRole(ic.DAO, r, uint32(index)) if err != nil { panic(err) } return pubsToArray(pubs) } func (s *Designate) rolesChanged() bool { rc := s.rolesChangedFlag.Load() return rc == nil || rc.(bool) } 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) } func (s *Designate) updateCachedRoleData(v *atomic.Value, d *dao.Simple, r noderoles.Role) error { nodeKeys, height, err := s.GetDesignatedByRole(d, r, math.MaxUint32) if err != nil { return err } v.Store(&roleData{ nodes: nodeKeys, addr: s.hashFromNodes(r, nodeKeys), height: height, }) switch r { case noderoles.Oracle: if orc, _ := s.OracleService.Load().(services.Oracle); orc != nil { orc.UpdateOracleNodes(nodeKeys.Copy()) } case noderoles.P2PNotary: if ntr, _ := s.NotaryService.Load().(services.Notary); ntr != nil { ntr.UpdateNotaryNodes(nodeKeys.Copy()) } case noderoles.StateValidator: if s.StateRootService != nil { s.StateRootService.UpdateStateValidators(height, nodeKeys.Copy()) } } return nil } func (s *Designate) getCachedRoleData(r noderoles.Role) *roleData { var val interface{} switch r { case noderoles.Oracle: val = s.oracles.Load() case noderoles.StateValidator: val = s.stateVals.Load() case noderoles.NeoFSAlphabet: val = s.neofsAlphabet.Load() case noderoles.P2PNotary: val = s.notaries.Load() } if val != nil { return val.(*roleData) } return nil } // GetLastDesignatedHash returns last designated hash of a given role. func (s *Designate) GetLastDesignatedHash(d *dao.Simple, r noderoles.Role) (util.Uint160, error) { if !s.isValidRole(r) { return util.Uint160{}, ErrInvalidRole } if !s.rolesChanged() { if val := s.getCachedRoleData(r); val != nil { return val.addr, nil } } nodes, _, err := s.GetDesignatedByRole(d, r, math.MaxUint32) if err != nil { return util.Uint160{}, err } // We only have hashing defined for oracles now. return s.hashFromNodes(r, nodes), 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 } if !s.rolesChanged() { if val := s.getCachedRoleData(r); val != nil && val.height <= index { return val.nodes.Copy(), val.height, nil } } 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() 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) s.rolesChangedFlag.Store(true) err := putConvertibleToDAO(s.ID, ic.DAO, key, &nl) if err != nil { return err } ic.Notifications = append(ic.Notifications, state.NotificationEvent{ ScriptHash: s.Hash, Name: DesignationEventName, Item: 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)) } // InitializeCache invalidates native Designate cache. func (s *Designate) InitializeCache() { s.rolesChangedFlag.Store(true) }