neoneo-go/pkg/core/native/designate.go

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2020-10-01 15:17:09 +00:00
package native
import (
"errors"
"math"
"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/state"
"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/manifest"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// Designate represents designation contract.
type Designate struct {
interop.ContractMD
NEO *NEO
rolesChangedFlag atomic.Value
oracleNodes atomic.Value
oracleHash atomic.Value
}
const (
designateContractID = -5
designateName = "Designation"
)
// Role represents type of participant.
type Role byte
// Role enumeration.
const (
RoleStateValidator Role = 4
RoleOracle Role = 8
)
// Various errors.
var (
ErrInvalidRole = errors.New("invalid role")
ErrEmptyNodeList = errors.New("node list is empty")
)
func isValidRole(r Role) bool {
return r == RoleOracle || r == RoleStateValidator
}
func newDesignate() *Designate {
s := &Designate{ContractMD: *interop.NewContractMD(designateName)}
s.ContractID = designateContractID
s.Manifest.Features = smartcontract.HasStorage
desc := newDescriptor("getDesignatedByRole", smartcontract.ArrayType,
manifest.NewParameter("role", smartcontract.IntegerType))
md := newMethodAndPrice(s.getDesignatedByRole, 0, smartcontract.AllowStates)
s.AddMethod(md, desc, false)
desc = newDescriptor("designateAsRole", smartcontract.VoidType,
manifest.NewParameter("role", smartcontract.IntegerType),
manifest.NewParameter("nodes", smartcontract.ArrayType))
md = newMethodAndPrice(s.designateAsRole, 0, smartcontract.AllowModifyStates)
s.AddMethod(md, desc, false)
return s
}
// Initialize initializes Oracle contract.
func (s *Designate) Initialize(ic *interop.Context) error {
roles := []Role{RoleStateValidator, RoleOracle}
for _, r := range roles {
si := &state.StorageItem{Value: new(NodeList).Bytes()}
if err := ic.DAO.PutStorageItem(s.ContractID, []byte{byte(r)}, si); err != nil {
return err
}
}
s.oracleNodes.Store(keys.PublicKeys(nil))
s.rolesChangedFlag.Store(true)
return nil
}
// OnPersistEnd updates cached values if they've been changed.
func (s *Designate) OnPersistEnd(d dao.DAO) error {
if !s.rolesChanged() {
return nil
}
var ns NodeList
err := getSerializableFromDAO(s.ContractID, d, []byte{byte(RoleOracle)}, &ns)
if err != nil {
return err
}
s.oracleNodes.Store(keys.PublicKeys(ns))
script, _ := smartcontract.CreateMajorityMultiSigRedeemScript(keys.PublicKeys(ns).Copy())
s.oracleHash.Store(hash.Hash160(script))
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 := getRole(args[0])
if !ok {
panic(ErrInvalidRole)
}
pubs, err := s.GetDesignatedByRole(ic.DAO, r)
if err != nil {
panic(err)
}
return pubsToArray(pubs)
}
func (s *Designate) rolesChanged() bool {
rc := s.rolesChangedFlag.Load()
return rc == nil || rc.(bool)
}
// GetDesignatedByRole returns nodes for role r.
func (s *Designate) GetDesignatedByRole(d dao.DAO, r Role) (keys.PublicKeys, error) {
if !isValidRole(r) {
return nil, ErrInvalidRole
}
if r == RoleOracle && !s.rolesChanged() {
return s.oracleNodes.Load().(keys.PublicKeys), nil
}
var ns NodeList
err := getSerializableFromDAO(s.ContractID, d, []byte{byte(r)}, &ns)
return keys.PublicKeys(ns), err
}
func (s *Designate) designateAsRole(ic *interop.Context, args []stackitem.Item) stackitem.Item {
r, ok := 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 pubsToArray(keys.PublicKeys(ns))
}
// DesignateAsRole sets nodes for role r.
func (s *Designate) DesignateAsRole(ic *interop.Context, r Role, pubs keys.PublicKeys) error {
if len(pubs) == 0 {
return ErrEmptyNodeList
}
if !isValidRole(r) {
return ErrInvalidRole
}
h := s.NEO.GetCommitteeAddress()
if ok, err := runtime.CheckHashedWitness(ic, h); err != nil || !ok {
return ErrInvalidWitness
}
sort.Sort(pubs)
s.rolesChangedFlag.Store(true)
si := &state.StorageItem{Value: NodeList(pubs).Bytes()}
return ic.DAO.PutStorageItem(s.ContractID, []byte{byte(r)}, si)
}
func getRole(item stackitem.Item) (Role, bool) {
bi, err := item.TryInteger()
if err != nil {
return 0, false
}
if !bi.IsUint64() {
return 0, false
}
u := bi.Uint64()
return Role(u), u <= math.MaxUint8 && isValidRole(Role(u))
}