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

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package native
import (
"errors"
"fmt"
"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/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/util"
)
// GAS represents GAS native contract.
type GAS struct {
nep5TokenNative
NEO *NEO
}
const gasSyscallName = "Neo.Native.Tokens.GAS"
const gasContractID = -2
// GASFactor is a divisor for finding GAS integral value.
const GASFactor = NEOTotalSupply
const initialGAS = 30000000
// NewGAS returns GAS native contract.
func NewGAS() *GAS {
g := &GAS{}
nep5 := newNEP5Native(gasSyscallName)
nep5.name = "GAS"
nep5.symbol = "gas"
nep5.decimals = 8
nep5.factor = GASFactor
nep5.onPersist = chainOnPersist(nep5.OnPersist, g.OnPersist)
nep5.incBalance = g.increaseBalance
nep5.ContractID = gasContractID
g.nep5TokenNative = *nep5
onp := g.Methods["onPersist"]
onp.Func = getOnPersistWrapper(g.onPersist)
g.Methods["onPersist"] = onp
return g
}
func (g *GAS) increaseBalance(_ *interop.Context, _ util.Uint160, si *state.StorageItem, amount *big.Int) error {
acc, err := state.NEP5BalanceStateFromBytes(si.Value)
if err != nil {
return err
}
if sign := amount.Sign(); sign == 0 {
return nil
} else if sign == -1 && acc.Balance.Cmp(new(big.Int).Neg(amount)) == -1 {
return errors.New("insufficient funds")
}
acc.Balance.Add(&acc.Balance, amount)
si.Value = acc.Bytes()
return nil
}
// Initialize initializes GAS contract.
func (g *GAS) Initialize(ic *interop.Context) error {
if err := g.nep5TokenNative.Initialize(ic); err != nil {
return err
}
if g.nep5TokenNative.getTotalSupply(ic).Sign() != 0 {
return errors.New("already initialized")
}
h, _, err := getStandbyValidatorsHash(ic)
if err != nil {
return err
}
g.mint(ic, h, big.NewInt(initialGAS*GASFactor))
return nil
}
// OnPersist implements Contract interface.
func (g *GAS) OnPersist(ic *interop.Context) error {
for _, tx := range ic.Block.Transactions {
absAmount := big.NewInt(int64(tx.SystemFee + tx.NetworkFee))
g.burn(ic, tx.Sender, absAmount)
}
validators, err := g.NEO.GetValidatorsInternal(ic.Chain, ic.DAO)
if err != nil {
return fmt.Errorf("cannot get block validators: %v", err)
}
primary := validators[ic.Block.ConsensusData.PrimaryIndex].GetScriptHash()
var netFee util.Fixed8
for _, tx := range ic.Block.Transactions {
netFee += tx.NetworkFee
}
g.mint(ic, primary, big.NewInt(int64(netFee)))
return nil
}
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
}
}