mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-23 13:38:35 +00:00
134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
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/smartcontract/manifest"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm"
|
|
)
|
|
|
|
// GAS represents GAS native contract.
|
|
type GAS struct {
|
|
nep5TokenNative
|
|
NEO *NEO
|
|
}
|
|
|
|
const gasSyscallName = "Neo.Native.Tokens.GAS"
|
|
|
|
// 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(g.onPersist, g.OnPersist)
|
|
nep5.incBalance = g.increaseBalance
|
|
|
|
g.nep5TokenNative = *nep5
|
|
|
|
desc := newDescriptor("getSysFeeAmount", smartcontract.IntegerType,
|
|
manifest.NewParameter("index", smartcontract.IntegerType))
|
|
md := newMethodAndPrice(g.getSysFeeAmount, 1, smartcontract.NoneFlag)
|
|
g.AddMethod(md, desc, true)
|
|
|
|
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 (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
|
|
}
|
|
}
|