mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-27 03:58:06 +00:00
285 lines
7.4 KiB
Go
285 lines
7.4 KiB
Go
package native
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import (
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"encoding/binary"
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"errors"
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"math"
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"sort"
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"sync/atomic"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Designate represents designation contract.
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type Designate struct {
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interop.ContractMD
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NEO *NEO
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rolesChangedFlag atomic.Value
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oracles atomic.Value
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// p2pSigExtensionsEnabled defines whether the P2P signature extensions logic is relevant.
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p2pSigExtensionsEnabled bool
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}
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type oraclesData struct {
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nodes keys.PublicKeys
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addr util.Uint160
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height uint32
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}
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const (
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designateContractID = -5
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designateName = "Designation"
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// maxNodeCount is the maximum number of nodes to set the role for.
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maxNodeCount = 32
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)
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// Role represents type of participant.
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type Role byte
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// Role enumeration.
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const (
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RoleStateValidator Role = 4
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RoleOracle Role = 8
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RoleP2PNotary Role = 128
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)
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// Various errors.
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var (
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ErrAlreadyDesignated = errors.New("already designated given role at current block")
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ErrEmptyNodeList = errors.New("node list is empty")
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ErrInvalidIndex = errors.New("invalid index")
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ErrInvalidRole = errors.New("invalid role")
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ErrLargeNodeList = errors.New("node list is too large")
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ErrNoBlock = errors.New("no persisting block in the context")
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)
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func (s *Designate) isValidRole(r Role) bool {
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return r == RoleOracle || r == RoleStateValidator || (s.p2pSigExtensionsEnabled && r == RoleP2PNotary)
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}
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func newDesignate(p2pSigExtensionsEnabled bool) *Designate {
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s := &Designate{ContractMD: *interop.NewContractMD(designateName)}
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s.ContractID = designateContractID
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s.p2pSigExtensionsEnabled = p2pSigExtensionsEnabled
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desc := newDescriptor("getDesignatedByRole", smartcontract.ArrayType,
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manifest.NewParameter("role", smartcontract.IntegerType),
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manifest.NewParameter("index", smartcontract.IntegerType))
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md := newMethodAndPrice(s.getDesignatedByRole, 1000000, smartcontract.AllowStates)
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s.AddMethod(md, desc, false)
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desc = newDescriptor("designateAsRole", smartcontract.VoidType,
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manifest.NewParameter("role", smartcontract.IntegerType),
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manifest.NewParameter("nodes", smartcontract.ArrayType))
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md = newMethodAndPrice(s.designateAsRole, 0, smartcontract.AllowModifyStates)
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s.AddMethod(md, desc, false)
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desc = newDescriptor("onPersist", smartcontract.VoidType)
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md = newMethodAndPrice(getOnPersistWrapper(onPersistBase), 0, smartcontract.AllowModifyStates)
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s.AddMethod(md, desc, false)
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desc = newDescriptor("postPersist", smartcontract.VoidType)
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md = newMethodAndPrice(getOnPersistWrapper(postPersistBase), 0, smartcontract.AllowModifyStates)
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s.AddMethod(md, desc, false)
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return s
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}
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// Initialize initializes Oracle contract.
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func (s *Designate) Initialize(ic *interop.Context) error {
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return nil
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}
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// OnPersistEnd updates cached values if they've been changed.
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func (s *Designate) OnPersistEnd(d dao.DAO) error {
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if !s.rolesChanged() {
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return nil
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}
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nodeKeys, height, err := s.GetDesignatedByRole(d, RoleOracle, math.MaxUint32)
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if err != nil {
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return err
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}
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od := &oraclesData{
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nodes: nodeKeys,
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addr: oracleHashFromNodes(nodeKeys),
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height: height,
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}
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s.oracles.Store(od)
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s.rolesChangedFlag.Store(false)
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return nil
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}
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// Metadata returns contract metadata.
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func (s *Designate) Metadata() *interop.ContractMD {
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return &s.ContractMD
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}
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func (s *Designate) getDesignatedByRole(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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r, ok := s.getRole(args[0])
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if !ok {
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panic(ErrInvalidRole)
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}
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ind, err := args[1].TryInteger()
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if err != nil || !ind.IsUint64() {
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panic(ErrInvalidIndex)
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}
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index := ind.Uint64()
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if index > uint64(ic.Chain.BlockHeight()+1) {
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panic(ErrInvalidIndex)
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}
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pubs, _, err := s.GetDesignatedByRole(ic.DAO, r, uint32(index))
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if err != nil {
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panic(err)
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}
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return pubsToArray(pubs)
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}
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func (s *Designate) rolesChanged() bool {
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rc := s.rolesChangedFlag.Load()
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return rc == nil || rc.(bool)
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}
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func oracleHashFromNodes(nodes keys.PublicKeys) util.Uint160 {
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if len(nodes) == 0 {
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return util.Uint160{}
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}
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script, _ := smartcontract.CreateMajorityMultiSigRedeemScript(nodes.Copy())
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return hash.Hash160(script)
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}
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func (s *Designate) getLastDesignatedHash(d dao.DAO, r Role) (util.Uint160, error) {
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if !s.isValidRole(r) {
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return util.Uint160{}, ErrInvalidRole
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}
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if r == RoleOracle && !s.rolesChanged() {
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odVal := s.oracles.Load()
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if odVal != nil {
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od := odVal.(*oraclesData)
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return od.addr, nil
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}
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}
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nodes, _, err := s.GetDesignatedByRole(d, r, math.MaxUint32)
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if err != nil {
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return util.Uint160{}, err
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}
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// We only have hashing defined for oracles now.
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return oracleHashFromNodes(nodes), nil
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}
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// GetDesignatedByRole returns nodes for role r.
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func (s *Designate) GetDesignatedByRole(d dao.DAO, r Role, index uint32) (keys.PublicKeys, uint32, error) {
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if !s.isValidRole(r) {
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return nil, 0, ErrInvalidRole
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}
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if r == RoleOracle && !s.rolesChanged() {
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odVal := s.oracles.Load()
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if odVal != nil {
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od := odVal.(*oraclesData)
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if od.height <= index {
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return od.nodes, od.height, nil
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}
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}
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}
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kvs, err := d.GetStorageItemsWithPrefix(s.ContractID, []byte{byte(r)})
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if err != nil {
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return nil, 0, err
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}
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var ns NodeList
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var bestIndex uint32
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var resSi *state.StorageItem
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for k, si := range kvs {
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if len(k) < 4 {
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continue
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}
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siInd := binary.BigEndian.Uint32([]byte(k))
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if (resSi == nil || siInd > bestIndex) && siInd <= index {
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bestIndex = siInd
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resSi = si
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}
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}
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if resSi != nil {
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reader := io.NewBinReaderFromBuf(resSi.Value)
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ns.DecodeBinary(reader)
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if reader.Err != nil {
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return nil, 0, reader.Err
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}
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}
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return keys.PublicKeys(ns), bestIndex, err
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}
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func (s *Designate) designateAsRole(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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r, ok := s.getRole(args[0])
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if !ok {
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panic(ErrInvalidRole)
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}
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var ns NodeList
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if err := ns.fromStackItem(args[1]); err != nil {
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panic(err)
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}
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err := s.DesignateAsRole(ic, r, keys.PublicKeys(ns))
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if err != nil {
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panic(err)
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}
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return pubsToArray(keys.PublicKeys(ns))
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}
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// DesignateAsRole sets nodes for role r.
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func (s *Designate) DesignateAsRole(ic *interop.Context, r Role, pubs keys.PublicKeys) error {
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length := len(pubs)
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if length == 0 {
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return ErrEmptyNodeList
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}
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if length > maxNodeCount {
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return ErrLargeNodeList
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}
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if !s.isValidRole(r) {
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return ErrInvalidRole
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}
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h := s.NEO.GetCommitteeAddress()
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if ok, err := runtime.CheckHashedWitness(ic, h); err != nil || !ok {
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return ErrInvalidWitness
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}
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if ic.Block == nil {
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return ErrNoBlock
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}
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var key = make([]byte, 5)
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key[0] = byte(r)
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binary.BigEndian.PutUint32(key[1:], ic.Block.Index+1)
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si := ic.DAO.GetStorageItem(s.ContractID, key)
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if si != nil {
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return ErrAlreadyDesignated
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}
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sort.Sort(pubs)
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s.rolesChangedFlag.Store(true)
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si = &state.StorageItem{Value: NodeList(pubs).Bytes()}
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return ic.DAO.PutStorageItem(s.ContractID, key, si)
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}
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func (s *Designate) getRole(item stackitem.Item) (Role, bool) {
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bi, err := item.TryInteger()
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if err != nil {
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return 0, false
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}
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if !bi.IsUint64() {
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return 0, false
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}
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u := bi.Uint64()
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return Role(u), u <= math.MaxUint8 && s.isValidRole(Role(u))
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}
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