143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
package native
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import (
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"errors"
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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/native/nativenames"
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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/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
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// GAS represents GAS native contract.
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type GAS struct {
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nep17TokenNative
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NEO *NEO
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initialSupply int64
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p2pSigExtensionsEnabled bool
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}
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const gasContractID = -6
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// GASFactor is a divisor for finding GAS integral value.
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const GASFactor = NEOTotalSupply
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// newGAS returns GAS native contract.
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func newGAS(init int64, p2pSigExtensionsEnabled bool) *GAS {
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g := &GAS{
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initialSupply: init,
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p2pSigExtensionsEnabled: p2pSigExtensionsEnabled,
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}
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defer g.UpdateHash()
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nep17 := newNEP17Native(nativenames.Gas, gasContractID)
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nep17.symbol = "GAS"
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nep17.decimals = 8
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nep17.factor = GASFactor
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nep17.incBalance = g.increaseBalance
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nep17.balFromBytes = g.balanceFromBytes
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g.nep17TokenNative = *nep17
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return g
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}
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func (g *GAS) increaseBalance(_ *interop.Context, _ util.Uint160, si *state.StorageItem, amount *big.Int, checkBal *big.Int) error {
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acc, err := state.NEP17BalanceFromBytes(*si)
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if err != nil {
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return err
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}
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if sign := amount.Sign(); sign == 0 {
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// Requested self-transfer amount can be higher than actual balance.
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if checkBal != nil && acc.Balance.Cmp(checkBal) < 0 {
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err = errors.New("insufficient funds")
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}
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return err
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} else if sign == -1 && acc.Balance.CmpAbs(amount) == -1 {
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return errors.New("insufficient funds")
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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 = acc.Bytes(nil)
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} else {
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*si = nil
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}
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return nil
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}
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func (g *GAS) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {
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acc, err := state.NEP17BalanceFromBytes(*si)
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if err != nil {
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return nil, err
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}
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return &acc.Balance, err
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}
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// Initialize initializes GAS contract.
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func (g *GAS) Initialize(ic *interop.Context) error {
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if err := g.nep17TokenNative.Initialize(ic); err != nil {
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return err
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}
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_, totalSupply := g.nep17TokenNative.getTotalSupply(ic.DAO)
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if totalSupply.Sign() != 0 {
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return errors.New("already initialized")
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}
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h, err := getStandbyValidatorsHash(ic)
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if err != nil {
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return err
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}
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g.mint(ic, h, big.NewInt(g.initialSupply), false)
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return nil
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}
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// OnPersist implements Contract interface.
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func (g *GAS) OnPersist(ic *interop.Context) error {
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if len(ic.Block.Transactions) == 0 {
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return nil
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}
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for _, tx := range ic.Block.Transactions {
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absAmount := big.NewInt(tx.SystemFee + tx.NetworkFee)
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g.burn(ic, tx.Sender(), absAmount)
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}
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validators := g.NEO.GetNextBlockValidatorsInternal()
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primary := validators[ic.Block.PrimaryIndex].GetScriptHash()
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var netFee int64
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for _, tx := range ic.Block.Transactions {
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netFee += tx.NetworkFee
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if g.p2pSigExtensionsEnabled {
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// Reward for NotaryAssisted attribute will be minted to designated notary nodes
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// by Notary contract.
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attrs := tx.GetAttributes(transaction.NotaryAssistedT)
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if len(attrs) != 0 {
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na := attrs[0].Value.(*transaction.NotaryAssisted)
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netFee -= (int64(na.NKeys) + 1) * transaction.NotaryServiceFeePerKey
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}
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}
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}
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g.mint(ic, primary, big.NewInt(int64(netFee)), false)
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return nil
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}
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// PostPersist implements Contract interface.
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func (g *GAS) PostPersist(ic *interop.Context) error {
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return nil
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}
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// BalanceOf returns native GAS token balance for the acc.
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func (g *GAS) BalanceOf(d dao.DAO, acc util.Uint160) *big.Int {
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return g.balanceOfInternal(d, acc)
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}
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func getStandbyValidatorsHash(ic *interop.Context) (util.Uint160, error) {
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s, err := smartcontract.CreateDefaultMultiSigRedeemScript(ic.Chain.GetStandByValidators())
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if err != nil {
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return util.Uint160{}, err
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}
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return hash.Hash160(s), nil
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}
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