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