mirror of
https://github.com/nspcc-dev/neo-go.git
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120 lines
2.9 KiB
Go
120 lines
2.9 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/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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nep5TokenNative
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NEO *NEO
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}
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const gasName = "GAS"
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const gasContractID = -2
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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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nep5 := newNEP5Native(gasName)
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nep5.symbol = "gas"
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nep5.decimals = 8
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nep5.factor = GASFactor
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nep5.onPersist = chainOnPersist(nep5.OnPersist, g.OnPersist)
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nep5.incBalance = g.increaseBalance
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nep5.ContractID = gasContractID
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g.nep5TokenNative = *nep5
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onp := g.Methods["onPersist"]
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onp.Func = getOnPersistWrapper(g.onPersist)
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g.Methods["onPersist"] = onp
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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.NEP5BalanceStateFromBytes(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.nep5TokenNative.Initialize(ic); err != nil {
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return err
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}
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if g.nep5TokenNative.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))
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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)))
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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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func chainOnPersist(fs ...func(*interop.Context) error) func(*interop.Context) error {
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return func(ic *interop.Context) error {
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for i := range fs {
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if fs[i] != nil {
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if err := fs[i](ic); err != nil {
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return err
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}
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}
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}
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return nil
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}
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}
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