mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-12 21:10:36 +00:00
357 lines
12 KiB
Go
357 lines
12 KiB
Go
package native
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"math/big"
|
|
|
|
"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/contract"
|
|
"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/core/storage"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
|
|
"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/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
|
|
)
|
|
|
|
// Notary represents Notary native contract.
|
|
type Notary struct {
|
|
interop.ContractMD
|
|
GAS *GAS
|
|
Desig *Designate
|
|
}
|
|
|
|
const (
|
|
notaryName = "Notary"
|
|
notaryContractID = reservedContractID - 1
|
|
|
|
// prefixDeposit is a prefix for storing Notary deposits.
|
|
prefixDeposit = 1
|
|
)
|
|
|
|
// newNotary returns Notary native contract.
|
|
func newNotary() *Notary {
|
|
n := &Notary{ContractMD: *interop.NewContractMD(notaryName)}
|
|
n.ContractID = notaryContractID
|
|
|
|
desc := newDescriptor("onPayment", smartcontract.VoidType,
|
|
manifest.NewParameter("from", smartcontract.Hash160Type),
|
|
manifest.NewParameter("amount", smartcontract.IntegerType),
|
|
manifest.NewParameter("data", smartcontract.AnyType))
|
|
md := newMethodAndPrice(n.onPayment, 100_0000, smartcontract.AllowModifyStates)
|
|
n.AddMethod(md, desc, true)
|
|
|
|
desc = newDescriptor("lockDepositUntil", smartcontract.BoolType,
|
|
manifest.NewParameter("address", smartcontract.Hash160Type),
|
|
manifest.NewParameter("till", smartcontract.IntegerType))
|
|
md = newMethodAndPrice(n.lockDepositUntil, 100_0000, smartcontract.AllowModifyStates)
|
|
n.AddMethod(md, desc, true)
|
|
|
|
desc = newDescriptor("withdraw", smartcontract.BoolType,
|
|
manifest.NewParameter("from", smartcontract.Hash160Type),
|
|
manifest.NewParameter("to", smartcontract.Hash160Type))
|
|
md = newMethodAndPrice(n.withdraw, 100_0000, smartcontract.AllowModifyStates)
|
|
n.AddMethod(md, desc, true)
|
|
|
|
desc = newDescriptor("balanceOf", smartcontract.IntegerType,
|
|
manifest.NewParameter("addr", smartcontract.Hash160Type))
|
|
md = newMethodAndPrice(n.balanceOf, 100_0000, smartcontract.AllowStates)
|
|
n.AddMethod(md, desc, true)
|
|
|
|
desc = newDescriptor("expirationOf", smartcontract.IntegerType,
|
|
manifest.NewParameter("addr", smartcontract.Hash160Type))
|
|
md = newMethodAndPrice(n.expirationOf, 100_0000, smartcontract.AllowStates)
|
|
n.AddMethod(md, desc, true)
|
|
|
|
desc = newDescriptor("verify", smartcontract.BoolType,
|
|
manifest.NewParameter("signature", smartcontract.SignatureType))
|
|
md = newMethodAndPrice(n.verify, 100_0000, smartcontract.AllowStates)
|
|
n.AddMethod(md, desc, false)
|
|
|
|
desc = newDescriptor("onPersist", smartcontract.VoidType)
|
|
md = newMethodAndPrice(getOnPersistWrapper(n.OnPersist), 0, smartcontract.AllowModifyStates)
|
|
n.AddMethod(md, desc, false)
|
|
|
|
desc = newDescriptor("postPersist", smartcontract.VoidType)
|
|
md = newMethodAndPrice(getOnPersistWrapper(postPersistBase), 0, smartcontract.AllowModifyStates)
|
|
n.AddMethod(md, desc, false)
|
|
|
|
return n
|
|
}
|
|
|
|
// Metadata implements Contract interface.
|
|
func (n *Notary) Metadata() *interop.ContractMD {
|
|
return &n.ContractMD
|
|
}
|
|
|
|
// Initialize initializes Notary native contract and implements Contract interface.
|
|
func (n *Notary) Initialize(ic *interop.Context) error {
|
|
return nil
|
|
}
|
|
|
|
// OnPersist implements Contract interface.
|
|
func (n *Notary) OnPersist(ic *interop.Context) error {
|
|
var (
|
|
nFees int64
|
|
notaries keys.PublicKeys
|
|
err error
|
|
)
|
|
for _, tx := range ic.Block.Transactions {
|
|
if tx.HasAttribute(transaction.NotaryAssistedT) {
|
|
if notaries == nil {
|
|
notaries, err = n.GetNotaryNodes(ic.DAO)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to get notary nodes: %w", err)
|
|
}
|
|
}
|
|
nKeys := tx.GetAttributes(transaction.NotaryAssistedT)[0].Value.(*transaction.NotaryAssisted).NKeys
|
|
nFees += int64(nKeys) + 1
|
|
if tx.Sender() == n.Hash {
|
|
payer := tx.Signers[1]
|
|
balance := n.getDepositFor(ic.DAO, payer.Account)
|
|
balance.Amount.Sub(balance.Amount, big.NewInt(tx.SystemFee+tx.NetworkFee))
|
|
if balance.Amount.Sign() == 0 {
|
|
err := n.removeDepositFor(ic.DAO, payer.Account)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to remove an empty deposit for %s from storage: %w", payer.Account.StringBE(), err)
|
|
}
|
|
} else {
|
|
err := n.putDepositFor(ic.DAO, balance, payer.Account)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to update deposit for %s: %w", payer.Account.StringBE(), err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if nFees == 0 {
|
|
return nil
|
|
}
|
|
singleReward := calculateNotaryReward(nFees, len(notaries))
|
|
for _, notary := range notaries {
|
|
n.GAS.mint(ic, notary.GetScriptHash(), singleReward, false)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// onPayment records deposited amount as belonging to "from" address with a lock
|
|
// till the specified chain's height.
|
|
func (n *Notary) onPayment(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
if h := ic.VM.GetCallingScriptHash(); h != n.GAS.Hash {
|
|
panic(fmt.Errorf("only GAS can be accepted for deposit, got %s", h.StringBE()))
|
|
}
|
|
from := toUint160(args[0])
|
|
to := from
|
|
amount := toBigInt(args[1])
|
|
data, ok := args[2].(*stackitem.Array)
|
|
if !ok || len(data.Value().([]stackitem.Item)) != 2 {
|
|
panic(errors.New("`data` parameter should be an array of 2 elements"))
|
|
}
|
|
additionalParams := data.Value().([]stackitem.Item)
|
|
if !additionalParams[0].Equals(stackitem.Null{}) {
|
|
to = toUint160(additionalParams[0])
|
|
}
|
|
till := toUint32(additionalParams[1])
|
|
currentHeight := ic.Chain.BlockHeight()
|
|
if till < currentHeight {
|
|
panic(fmt.Errorf("`till` shouldn't be less then the chain's height %d", currentHeight))
|
|
}
|
|
|
|
deposit := n.getDepositFor(ic.DAO, to)
|
|
if deposit == nil {
|
|
if amount.Cmp(big.NewInt(2*transaction.NotaryServiceFeePerKey)) < 0 {
|
|
panic(fmt.Errorf("first deposit can not be less then %d, got %d", 2*transaction.NotaryServiceFeePerKey, amount.Int64()))
|
|
}
|
|
deposit = &state.Deposit{
|
|
Amount: new(big.Int),
|
|
}
|
|
} else {
|
|
if till < deposit.Till {
|
|
panic(fmt.Errorf("`till` shouldn't be less then the previous value %d", deposit.Till))
|
|
}
|
|
}
|
|
deposit.Amount.Add(deposit.Amount, amount)
|
|
deposit.Till = till
|
|
|
|
if err := n.putDepositFor(ic.DAO, deposit, to); err != nil {
|
|
panic(fmt.Errorf("failed to put deposit for %s into the storage: %w", from.StringBE(), err))
|
|
}
|
|
return stackitem.Null{}
|
|
}
|
|
|
|
// lockDepositUntil updates the chain's height until which deposit is locked.
|
|
func (n *Notary) lockDepositUntil(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
addr := toUint160(args[0])
|
|
ok, err := runtime.CheckHashedWitness(ic, addr)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to check witness for %s: %w", addr.StringBE(), err))
|
|
}
|
|
if !ok {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
till := toUint32(args[1])
|
|
if till < ic.Chain.BlockHeight() {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
deposit := n.getDepositFor(ic.DAO, addr)
|
|
if deposit == nil {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
if till < deposit.Till {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
deposit.Till = till
|
|
err = n.putDepositFor(ic.DAO, deposit, addr)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to put deposit for %s into the storage: %w", addr.StringBE(), err))
|
|
}
|
|
return stackitem.NewBool(true)
|
|
}
|
|
|
|
// withdraw sends all deposited GAS for "from" address to "to" address.
|
|
func (n *Notary) withdraw(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
from := toUint160(args[0])
|
|
ok, err := runtime.CheckHashedWitness(ic, from)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to check witness for %s: %w", from.StringBE(), err))
|
|
}
|
|
if !ok {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
to := from
|
|
if !args[1].Equals(stackitem.Null{}) {
|
|
to = toUint160(args[1])
|
|
}
|
|
deposit := n.getDepositFor(ic.DAO, from)
|
|
if deposit == nil {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
if ic.Chain.BlockHeight() < deposit.Till {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
cs, err := ic.DAO.GetContractState(n.GAS.Hash)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to get GAS contract state: %w", err))
|
|
}
|
|
transferArgs := []stackitem.Item{stackitem.NewByteArray(n.Hash.BytesBE()), stackitem.NewByteArray(to.BytesBE()), stackitem.NewBigInteger(deposit.Amount), stackitem.Null{}}
|
|
err = contract.CallExInternal(ic, cs, "transfer", transferArgs, smartcontract.All, vm.EnsureIsEmpty, func(ctx *vm.Context) { // we need EnsureIsEmpty because there's a callback popping result from the stack
|
|
isTransferOk := ic.VM.Estack().Pop().Bool()
|
|
if !isTransferOk {
|
|
panic("failed to transfer GAS from Notary account")
|
|
}
|
|
})
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to transfer GAS from Notary account: %w", err))
|
|
}
|
|
if err := n.removeDepositFor(ic.DAO, from); err != nil {
|
|
panic(fmt.Errorf("failed to remove withdrawn deposit for %s from the storage: %w", from.StringBE(), err))
|
|
}
|
|
return stackitem.NewBool(true)
|
|
}
|
|
|
|
// balanceOf returns deposited GAS amount for specified address.
|
|
func (n *Notary) balanceOf(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
acc := toUint160(args[0])
|
|
deposit := n.getDepositFor(ic.DAO, acc)
|
|
if deposit == nil {
|
|
return stackitem.NewBigInteger(big.NewInt(0))
|
|
}
|
|
return stackitem.NewBigInteger(deposit.Amount)
|
|
}
|
|
|
|
// expirationOf Returns deposit lock height for specified address.
|
|
func (n *Notary) expirationOf(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
acc := toUint160(args[0])
|
|
deposit := n.getDepositFor(ic.DAO, acc)
|
|
if deposit == nil {
|
|
return stackitem.Make(0)
|
|
}
|
|
return stackitem.Make(deposit.Till)
|
|
}
|
|
|
|
// verify checks whether the transaction was signed by one of the notaries.
|
|
func (n *Notary) verify(ic *interop.Context, args []stackitem.Item) stackitem.Item {
|
|
sig, err := args[0].TryBytes()
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to get signature bytes: %w", err))
|
|
}
|
|
tx := ic.Tx
|
|
if len(tx.GetAttributes(transaction.NotaryAssistedT)) == 0 {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
for _, signer := range tx.Signers {
|
|
if signer.Account == n.Hash {
|
|
if signer.Scopes != transaction.None {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
}
|
|
}
|
|
if tx.Sender() == n.Hash {
|
|
if len(tx.Signers) != 2 {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
payer := tx.Signers[1].Account
|
|
balance := n.getDepositFor(ic.DAO, payer)
|
|
if balance == nil || balance.Amount.Cmp(big.NewInt(tx.NetworkFee+tx.SystemFee)) < 0 {
|
|
return stackitem.NewBool(false)
|
|
}
|
|
}
|
|
notaries, err := n.GetNotaryNodes(ic.DAO)
|
|
if err != nil {
|
|
panic(fmt.Errorf("failed to get notary nodes: %w", err))
|
|
}
|
|
hash := tx.GetSignedHash().BytesBE()
|
|
var verified bool
|
|
for _, n := range notaries {
|
|
if n.Verify(sig, hash) {
|
|
verified = true
|
|
break
|
|
}
|
|
}
|
|
return stackitem.NewBool(verified)
|
|
}
|
|
|
|
// GetNotaryNodes returns public keys of notary nodes.
|
|
func (n *Notary) GetNotaryNodes(d dao.DAO) (keys.PublicKeys, error) {
|
|
nodes, _, err := n.Desig.GetDesignatedByRole(d, RoleP2PNotary, math.MaxUint32)
|
|
return nodes, err
|
|
}
|
|
|
|
// getDepositFor returns state.Deposit for the account specified. It returns nil in case if
|
|
// deposit is not found in storage and panics in case of any other error.
|
|
func (n *Notary) getDepositFor(dao dao.DAO, acc util.Uint160) *state.Deposit {
|
|
key := append([]byte{prefixDeposit}, acc.BytesBE()...)
|
|
deposit := new(state.Deposit)
|
|
err := getSerializableFromDAO(n.ContractID, dao, key, deposit)
|
|
if err == nil {
|
|
return deposit
|
|
}
|
|
if err == storage.ErrKeyNotFound {
|
|
return nil
|
|
}
|
|
panic(fmt.Errorf("failed to get deposit for %s from storage: %w", acc.StringBE(), err))
|
|
}
|
|
|
|
// putDepositFor puts deposit on the balance of the specified account in the storage.
|
|
func (n *Notary) putDepositFor(dao dao.DAO, deposit *state.Deposit, acc util.Uint160) error {
|
|
key := append([]byte{prefixDeposit}, acc.BytesBE()...)
|
|
return putSerializableToDAO(n.ContractID, dao, key, deposit)
|
|
}
|
|
|
|
// removeDepositFor removes deposit from the storage.
|
|
func (n *Notary) removeDepositFor(dao dao.DAO, acc util.Uint160) error {
|
|
key := append([]byte{prefixDeposit}, acc.BytesBE()...)
|
|
return dao.DeleteStorageItem(n.ContractID, key)
|
|
}
|
|
|
|
// calculateNotaryReward calculates the reward for a single notary node based on FEE's count and Notary nodes count.
|
|
func calculateNotaryReward(nFees int64, notariesCount int) *big.Int {
|
|
return big.NewInt(nFees * transaction.NotaryServiceFeePerKey / int64(notariesCount))
|
|
}
|