mirror of
https://github.com/nspcc-dev/neo-go.git
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ac527650eb
But don't change the way we process/store transactions and blocks. Effectively it's just an interface for smart contracts that replaces old syscalls. Transaction definition is moved temporarily to runtime package and Block definition is removed (till we solve #1691 properly).
106 lines
2.7 KiB
Go
106 lines
2.7 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/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/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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}
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const gasContractID = -4
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// GASFactor is a divisor for finding GAS integral value.
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const GASFactor = NEOTotalSupply
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const initialGAS = 30000000
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// newGAS returns GAS native contract.
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func newGAS() *GAS {
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g := &GAS{}
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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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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) error {
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acc, err := state.NEP17BalanceStateFromBytes(si.Value)
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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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return nil
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} else if 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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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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// 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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if g.nep17TokenNative.getTotalSupply(ic.DAO).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(initialGAS*GASFactor), 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.ConsensusData.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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}
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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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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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