501 lines
14 KiB
Go
501 lines
14 KiB
Go
package native
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import (
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"math/big"
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"sort"
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"strings"
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"sync/atomic"
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"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
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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/keys"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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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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"github.com/pkg/errors"
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)
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// NEO represents NEO native contract.
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type NEO struct {
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nep5TokenNative
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GAS *GAS
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validators atomic.Value
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}
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// keyWithVotes is a serialized key with votes balance. It's not deserialized
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// because some uses of it imply serialized-only usage and converting to
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// PublicKey is quite expensive.
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type keyWithVotes struct {
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Key string
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Votes *big.Int
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}
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const (
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neoSyscallName = "Neo.Native.Tokens.NEO"
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neoContractID = -1
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// NEOTotalSupply is the total amount of NEO in the system.
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NEOTotalSupply = 100000000
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// prefixValidator is a prefix used to store validator's data.
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prefixValidator = 33
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)
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var (
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// validatorsCountKey is a key used to store validators count
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// used to determine the real number of validators.
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validatorsCountKey = []byte{15}
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// nextValidatorsKey is a key used to store validators for the
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// next block.
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nextValidatorsKey = []byte{14}
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)
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// makeValidatorKey creates a key from account script hash.
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func makeValidatorKey(key *keys.PublicKey) []byte {
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b := key.Bytes()
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// Don't create a new buffer.
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b = append(b, 0)
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copy(b[1:], b[0:])
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b[0] = prefixValidator
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return b
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}
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// NewNEO returns NEO native contract.
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func NewNEO() *NEO {
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n := &NEO{}
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nep5 := newNEP5Native(neoSyscallName)
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nep5.name = "NEO"
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nep5.symbol = "neo"
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nep5.decimals = 0
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nep5.factor = 1
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nep5.onPersist = chainOnPersist(nep5.OnPersist, n.OnPersist)
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nep5.incBalance = n.increaseBalance
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nep5.ContractID = neoContractID
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n.nep5TokenNative = *nep5
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n.validators.Store(keys.PublicKeys(nil))
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onp := n.Methods["onPersist"]
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onp.Func = getOnPersistWrapper(n.onPersist)
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n.Methods["onPersist"] = onp
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desc := newDescriptor("unclaimedGas", smartcontract.IntegerType,
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manifest.NewParameter("account", smartcontract.Hash160Type),
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manifest.NewParameter("end", smartcontract.IntegerType))
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md := newMethodAndPrice(n.unclaimedGas, 3000000, smartcontract.AllowStates)
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n.AddMethod(md, desc, true)
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desc = newDescriptor("registerValidator", smartcontract.BoolType,
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manifest.NewParameter("pubkey", smartcontract.PublicKeyType))
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md = newMethodAndPrice(n.registerValidator, 5000000, smartcontract.AllowModifyStates)
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n.AddMethod(md, desc, false)
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desc = newDescriptor("vote", smartcontract.BoolType,
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manifest.NewParameter("account", smartcontract.Hash160Type),
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manifest.NewParameter("pubkeys", smartcontract.ArrayType))
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md = newMethodAndPrice(n.vote, 500000000, smartcontract.AllowModifyStates)
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n.AddMethod(md, desc, false)
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desc = newDescriptor("getRegisteredValidators", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getRegisteredValidatorsCall, 100000000, smartcontract.AllowStates)
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n.AddMethod(md, desc, true)
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desc = newDescriptor("getValidators", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getValidators, 100000000, smartcontract.AllowStates)
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n.AddMethod(md, desc, true)
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desc = newDescriptor("getNextBlockValidators", smartcontract.ArrayType)
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md = newMethodAndPrice(n.getNextBlockValidators, 100000000, smartcontract.AllowStates)
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n.AddMethod(md, desc, true)
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return n
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}
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// Initialize initializes NEO contract.
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func (n *NEO) Initialize(ic *interop.Context) error {
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if err := n.nep5TokenNative.Initialize(ic); err != nil {
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return err
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}
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if n.nep5TokenNative.getTotalSupply(ic).Sign() != 0 {
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return errors.New("already initialized")
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}
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h, vs, err := getStandbyValidatorsHash(ic)
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if err != nil {
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return err
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}
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n.mint(ic, h, big.NewInt(NEOTotalSupply))
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for i := range vs {
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if err := n.registerValidatorInternal(ic, vs[i]); err != nil {
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return err
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}
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}
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return nil
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}
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// OnPersist implements Contract interface.
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func (n *NEO) OnPersist(ic *interop.Context) error {
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pubs, err := n.GetValidatorsInternal(ic.Chain, ic.DAO)
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if err != nil {
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return err
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}
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si := new(state.StorageItem)
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si.Value = pubs.Bytes()
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return ic.DAO.PutStorageItem(n.ContractID, nextValidatorsKey, si)
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}
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func (n *NEO) increaseBalance(ic *interop.Context, h util.Uint160, si *state.StorageItem, amount *big.Int) error {
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acc, err := state.NEOBalanceStateFromBytes(si.Value)
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if err != nil {
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return err
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}
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if amount.Sign() == -1 && acc.Balance.Cmp(new(big.Int).Neg(amount)) == -1 {
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return errors.New("insufficient funds")
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}
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if err := n.distributeGas(ic, h, acc); err != nil {
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return err
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}
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if amount.Sign() == 0 {
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si.Value = acc.Bytes()
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return nil
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}
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if len(acc.Votes) > 0 {
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if err := n.ModifyAccountVotes(acc, ic.DAO, amount); err != nil {
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return err
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}
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siVC := ic.DAO.GetStorageItem(n.ContractID, validatorsCountKey)
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if siVC == nil {
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return errors.New("validators count uninitialized")
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}
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vc, err := ValidatorsCountFromBytes(siVC.Value)
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if err != nil {
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return err
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}
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vc[len(acc.Votes)-1].Add(&vc[len(acc.Votes)-1], amount)
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siVC.Value = vc.Bytes()
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if err := ic.DAO.PutStorageItem(n.ContractID, validatorsCountKey, siVC); err != nil {
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return err
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}
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}
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acc.Balance.Add(&acc.Balance, amount)
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if acc.Balance.Sign() != 0 {
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si.Value = acc.Bytes()
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} else {
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si.Value = nil
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}
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return nil
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}
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func (n *NEO) distributeGas(ic *interop.Context, h util.Uint160, acc *state.NEOBalanceState) error {
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if ic.Block == nil || ic.Block.Index == 0 {
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return nil
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}
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gen := ic.Chain.CalculateClaimable(&acc.Balance, acc.BalanceHeight, ic.Block.Index)
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acc.BalanceHeight = ic.Block.Index
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n.GAS.mint(ic, h, gen)
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return nil
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}
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func (n *NEO) unclaimedGas(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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u := toUint160(args[0])
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end := uint32(toBigInt(args[1]).Int64())
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bs, err := ic.DAO.GetNEP5Balances(u)
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if err != nil {
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panic(err)
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}
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tr := bs.Trackers[n.Hash]
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gen := ic.Chain.CalculateClaimable(&tr.Balance, tr.LastUpdatedBlock, end)
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return stackitem.NewBigInteger(gen)
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}
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func (n *NEO) registerValidator(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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err := n.registerValidatorInternal(ic, toPublicKey(args[0]))
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return stackitem.NewBool(err == nil)
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}
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func (n *NEO) registerValidatorInternal(ic *interop.Context, pub *keys.PublicKey) error {
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key := makeValidatorKey(pub)
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si := ic.DAO.GetStorageItem(n.ContractID, key)
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if si != nil {
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return errors.New("already registered")
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}
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si = new(state.StorageItem)
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// Zero value.
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si.Value = []byte{}
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return ic.DAO.PutStorageItem(n.ContractID, key, si)
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}
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func (n *NEO) vote(ic *interop.Context, args []stackitem.Item) stackitem.Item {
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acc := toUint160(args[0])
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arr := args[1].Value().([]stackitem.Item)
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var pubs keys.PublicKeys
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for i := range arr {
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pub := new(keys.PublicKey)
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bs, err := arr[i].TryBytes()
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if err != nil {
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panic(err)
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} else if err := pub.DecodeBytes(bs); err != nil {
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panic(err)
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}
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pubs = append(pubs, pub)
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}
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err := n.VoteInternal(ic, acc, pubs)
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return stackitem.NewBool(err == nil)
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}
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// VoteInternal votes from account h for validarors specified in pubs.
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func (n *NEO) VoteInternal(ic *interop.Context, h util.Uint160, pubs keys.PublicKeys) error {
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ok, err := runtime.CheckHashedWitness(ic, nep5ScriptHash{
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callingScriptHash: util.Uint160{},
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entryScriptHash: n.Hash,
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currentScriptHash: n.Hash,
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}, h)
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if err != nil {
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return err
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} else if !ok {
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return errors.New("invalid signature")
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}
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key := makeAccountKey(h)
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si := ic.DAO.GetStorageItem(n.ContractID, key)
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if si == nil {
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return errors.New("invalid account")
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}
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acc, err := state.NEOBalanceStateFromBytes(si.Value)
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if err != nil {
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return err
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}
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if err := n.ModifyAccountVotes(acc, ic.DAO, new(big.Int).Neg(&acc.Balance)); err != nil {
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return err
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}
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pubs = pubs.Unique()
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// Check validators registration.
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var newPubs keys.PublicKeys
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for _, pub := range pubs {
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if ic.DAO.GetStorageItem(n.ContractID, makeValidatorKey(pub)) == nil {
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continue
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}
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newPubs = append(newPubs, pub)
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}
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if lp, lv := len(newPubs), len(acc.Votes); lp != lv {
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var si *state.StorageItem
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var vc *ValidatorsCount
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var err error
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si = ic.DAO.GetStorageItem(n.ContractID, validatorsCountKey)
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if si == nil {
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// The first voter.
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si = new(state.StorageItem)
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vc = new(ValidatorsCount)
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} else {
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vc, err = ValidatorsCountFromBytes(si.Value)
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if err != nil {
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return err
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}
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}
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if lv > 0 {
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vc[lv-1].Sub(&vc[lv-1], &acc.Balance)
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}
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if len(newPubs) > 0 {
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vc[lp-1].Add(&vc[lp-1], &acc.Balance)
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}
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si.Value = vc.Bytes()
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if err := ic.DAO.PutStorageItem(n.ContractID, validatorsCountKey, si); err != nil {
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return err
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}
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}
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acc.Votes = newPubs
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if err := n.ModifyAccountVotes(acc, ic.DAO, &acc.Balance); err != nil {
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return err
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}
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si.Value = acc.Bytes()
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return ic.DAO.PutStorageItem(n.ContractID, key, si)
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}
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// ModifyAccountVotes modifies votes of the specified account by value (can be negative).
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func (n *NEO) ModifyAccountVotes(acc *state.NEOBalanceState, d dao.DAO, value *big.Int) error {
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for _, vote := range acc.Votes {
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key := makeValidatorKey(vote)
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si := d.GetStorageItem(n.ContractID, key)
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if si == nil {
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return errors.New("invalid validator")
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}
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votes := bigint.FromBytes(si.Value)
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votes.Add(votes, value)
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si.Value = bigint.ToPreallocatedBytes(votes, si.Value[:0])
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if err := d.PutStorageItem(n.ContractID, key, si); err != nil {
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return err
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}
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}
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n.validators.Store(keys.PublicKeys(nil))
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return nil
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}
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func (n *NEO) getRegisteredValidators(d dao.DAO) ([]keyWithVotes, error) {
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siMap, err := d.GetStorageItemsWithPrefix(n.ContractID, []byte{prefixValidator})
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if err != nil {
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return nil, err
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}
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arr := make([]keyWithVotes, 0, len(siMap))
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for key, si := range siMap {
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votes := bigint.FromBytes(si.Value)
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arr = append(arr, keyWithVotes{key, votes})
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}
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sort.Slice(arr, func(i, j int) bool { return strings.Compare(arr[i].Key, arr[j].Key) == -1 })
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return arr, nil
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}
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// GetRegisteredValidators returns current registered validators list with keys
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// and votes.
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func (n *NEO) GetRegisteredValidators(d dao.DAO) ([]state.Validator, error) {
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kvs, err := n.getRegisteredValidators(d)
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if err != nil {
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return nil, err
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}
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arr := make([]state.Validator, len(kvs))
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for i := range kvs {
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arr[i].Key, err = keys.NewPublicKeyFromBytes([]byte(kvs[i].Key))
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if err != nil {
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return nil, err
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}
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arr[i].Votes = kvs[i].Votes
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}
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return arr, nil
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}
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func (n *NEO) getRegisteredValidatorsCall(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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validators, err := n.getRegisteredValidators(ic.DAO)
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if err != nil {
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panic(err)
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}
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arr := make([]stackitem.Item, len(validators))
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for i := range validators {
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arr[i] = stackitem.NewStruct([]stackitem.Item{
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stackitem.NewByteArray([]byte(validators[i].Key)),
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stackitem.NewBigInteger(validators[i].Votes),
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})
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}
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return stackitem.NewArray(arr)
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}
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// GetValidatorsInternal returns a list of current validators.
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func (n *NEO) GetValidatorsInternal(bc blockchainer.Blockchainer, d dao.DAO) (keys.PublicKeys, error) {
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if vals := n.validators.Load().(keys.PublicKeys); vals != nil {
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return vals.Copy(), nil
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}
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standByValidators := bc.GetStandByValidators()
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si := d.GetStorageItem(n.ContractID, validatorsCountKey)
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if si == nil {
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n.validators.Store(standByValidators)
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return standByValidators.Copy(), nil
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}
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validatorsCount, err := ValidatorsCountFromBytes(si.Value)
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if err != nil {
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return nil, err
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}
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validators, err := n.GetRegisteredValidators(d)
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if err != nil {
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return nil, err
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}
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sort.Slice(validators, func(i, j int) bool {
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// The most-voted validators should end up in the front of the list.
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cmp := validators[i].Votes.Cmp(validators[j].Votes)
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if cmp != 0 {
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return cmp > 0
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}
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// Ties are broken with public keys.
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return validators[i].Key.Cmp(validators[j].Key) == -1
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})
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count := validatorsCount.GetWeightedAverage()
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if count < len(standByValidators) {
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count = len(standByValidators)
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}
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uniqueSBValidators := standByValidators.Unique()
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result := keys.PublicKeys{}
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for _, validator := range validators {
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if validator.Votes.Sign() > 0 || uniqueSBValidators.Contains(validator.Key) {
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result = append(result, validator.Key)
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}
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}
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if result.Len() >= count {
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result = result[:count]
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} else {
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for i := 0; i < uniqueSBValidators.Len() && result.Len() < count; i++ {
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if !result.Contains(uniqueSBValidators[i]) {
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result = append(result, uniqueSBValidators[i])
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}
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}
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}
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sort.Sort(result)
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n.validators.Store(result)
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return result, nil
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}
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func (n *NEO) getValidators(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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result, err := n.GetValidatorsInternal(ic.Chain, ic.DAO)
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if err != nil {
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panic(err)
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}
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return pubsToArray(result)
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}
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func (n *NEO) getNextBlockValidators(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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result, err := n.getNextBlockValidatorsInternal(ic.Chain, ic.DAO)
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if err != nil {
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panic(err)
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}
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return pubsToArray(result)
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}
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// GetNextBlockValidatorsInternal returns next block validators.
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func (n *NEO) GetNextBlockValidatorsInternal(bc blockchainer.Blockchainer, d dao.DAO) (keys.PublicKeys, error) {
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pubs, err := n.getNextBlockValidatorsInternal(bc, d)
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if err != nil {
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return nil, err
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}
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return pubs.Copy(), nil
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}
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// getNextBlockValidatorsInternal returns next block validators.
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func (n *NEO) getNextBlockValidatorsInternal(bc blockchainer.Blockchainer, d dao.DAO) (keys.PublicKeys, error) {
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si := d.GetStorageItem(n.ContractID, nextValidatorsKey)
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if si == nil {
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return n.GetValidatorsInternal(bc, d)
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}
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pubs := keys.PublicKeys{}
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err := pubs.DecodeBytes(si.Value)
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if err != nil {
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return nil, err
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}
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return pubs, nil
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}
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func pubsToArray(pubs keys.PublicKeys) stackitem.Item {
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arr := make([]stackitem.Item, len(pubs))
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for i := range pubs {
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arr[i] = stackitem.NewByteArray(pubs[i].Bytes())
|
|
}
|
|
return stackitem.NewArray(arr)
|
|
}
|
|
|
|
func toPublicKey(s stackitem.Item) *keys.PublicKey {
|
|
buf, err := s.TryBytes()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
pub := new(keys.PublicKey)
|
|
if err := pub.DecodeBytes(buf); err != nil {
|
|
panic(err)
|
|
}
|
|
return pub
|
|
}
|