neoneo-go/pkg/core/native/native_gas.go

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package native
import (
"errors"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
"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/crypto/hash"
"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/emit"
)
// GAS represents GAS native contract.
type GAS struct {
nep5TokenNative
NEO *NEO
}
const gasSyscallName = "Neo.Native.Tokens.GAS"
// NewGAS returns GAS native contract.
func NewGAS() *GAS {
nep5 := newNEP5Native(gasSyscallName)
nep5.name = "GAS"
nep5.symbol = "gas"
nep5.decimals = 8
nep5.factor = 100000000
g := &GAS{nep5TokenNative: *nep5}
desc := newDescriptor("getSysFeeAmount", smartcontract.IntegerType,
manifest.NewParameter("index", smartcontract.IntegerType))
md := newMethodAndPrice(g.getSysFeeAmount, 1, smartcontract.NoneFlag)
g.AddMethod(md, desc, true)
g.onPersist = chainOnPersist(g.onPersist, g.OnPersist)
g.incBalance = g.increaseBalance
return g
}
// initFromStore initializes variable contract parameters from the store.
func (g *GAS) initFromStore(data []byte) error {
g.totalSupply = *emit.BytesToInt(data)
return nil
}
func (g *GAS) serializeState() []byte {
return emit.IntToBytes(&g.totalSupply)
}
func (g *GAS) increaseBalance(_ *interop.Context, acc *state.Account, amount *big.Int) error {
if sign := amount.Sign(); sign == 0 {
return nil
} else if sign == -1 && acc.GAS.Balance.Cmp(new(big.Int).Neg(amount)) == -1 {
return errors.New("insufficient funds")
}
acc.GAS.Balance.Add(&acc.GAS.Balance, amount)
return nil
}
// Initialize initializes GAS contract.
func (g *GAS) Initialize(ic *interop.Context) error {
data, err := ic.DAO.GetNativeContractState(g.Hash)
if err == nil {
return g.initFromStore(data)
} else if err != storage.ErrKeyNotFound {
return err
}
if err := g.nep5TokenNative.Initialize(); err != nil {
return err
}
h, _, err := getStandbyValidatorsHash(ic)
if err != nil {
return err
}
g.mint(ic, h, big.NewInt(30000000*g.factor))
return ic.DAO.PutNativeContractState(g.Hash, g.serializeState())
}
// OnPersist implements Contract interface.
func (g *GAS) OnPersist(ic *interop.Context) error {
//for _ ,tx := range ic.block.Transactions {
// g.burn(ic, tx.Sender, tx.SystemFee + tx.NetworkFee)
//}
//validators := g.NEO.getNextBlockValidators(ic)
//var netFee util.Fixed8
//for _, tx := range ic.block.Transactions {
// netFee += tx.NetworkFee
//}
//g.mint(ic, <primary>, netFee)
return ic.DAO.PutNativeContractState(g.Hash, g.serializeState())
}
func (g *GAS) getSysFeeAmount(ic *interop.Context, args []vm.StackItem) vm.StackItem {
index := toBigInt(args[0])
h := ic.Chain.GetHeaderHash(int(index.Int64()))
_, sf, err := ic.DAO.GetBlock(h)
if err != nil {
panic(err)
}
return vm.NewBigIntegerItem(big.NewInt(int64(sf)))
}
func getStandbyValidatorsHash(ic *interop.Context) (util.Uint160, []*keys.PublicKey, error) {
vs, err := ic.Chain.GetStandByValidators()
if err != nil {
return util.Uint160{}, nil, err
}
s, err := smartcontract.CreateMultiSigRedeemScript(len(vs)/2+1, vs)
if err != nil {
return util.Uint160{}, nil, err
}
return hash.Hash160(s), vs, nil
}
func chainOnPersist(fs ...func(*interop.Context) error) func(*interop.Context) error {
return func(ic *interop.Context) error {
for i := range fs {
if fs[i] != nil {
if err := fs[i](ic); err != nil {
return err
}
}
}
return nil
}
}