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native: add refuel method to GAS contract

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This commit is contained in:
Evgeniy Stratonikov 2021-04-29 13:19:51 +03:00
parent 0114f9a912
commit ac601601c1
5 changed files with 128 additions and 2 deletions
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4
pkg/compiler/native_test.go
View file

@ -136,7 +136,9 @@ func TestNativeHelpersCompile(t *testing.T) {
{"unclaimedGas", []string{u160, "123"}},
{"unregisterCandidate", []string{pub}},
}, nep17TestCases...))
runNativeTestCases(t, cs.GAS.ContractMD, "gas", nep17TestCases)
runNativeTestCases(t, cs.GAS.ContractMD, "gas", append([]nativeTestCase{
{"refuel", []string{u160, "123"}},
}, nep17TestCases...))
runNativeTestCases(t, cs.Oracle.ContractMD, "oracle", []nativeTestCase{
{"getPrice", nil},
{"request", []string{`"url"`, "nil", `"callback"`, "nil", "123"}},

20
pkg/core/interop_system_test.go
View file

@ -347,6 +347,10 @@ func getTestContractState(bc *Blockchain) (*state.Contract, *state.Contract) {
emit.Opcodes(w.BinWriter, opcode.CALLT, 1, 0, opcode.RET)
callT2Off := w.Len()
emit.Opcodes(w.BinWriter, opcode.CALLT, 0, 0, opcode.RET)
refuelOff := w.Len()
emit.Opcodes(w.BinWriter, opcode.PUSH2, opcode.PACK)
emit.AppCallNoArgs(w.BinWriter, bc.contracts.GAS.Hash, "refuel", callflag.States|callflag.AllowNotify)
emit.Opcodes(w.BinWriter, opcode.DROP)
burnGasOff := w.Len()
emit.Syscall(w.BinWriter, interopnames.SystemRuntimeBurnGas)
emit.Opcodes(w.BinWriter, opcode.RET)
@ -518,8 +522,18 @@ func getTestContractState(bc *Blockchain) (*state.Contract, *state.Contract) {
},
ReturnType: smartcontract.VoidType,
},
{
Name: "refuelGas",
Offset: refuelOff,
Parameters: []manifest.Parameter{
manifest.NewParameter("account", smartcontract.Hash160Type),
manifest.NewParameter("gasRefuel", smartcontract.IntegerType),
manifest.NewParameter("gasBurn", smartcontract.IntegerType),
},
ReturnType: smartcontract.VoidType,
},
}
m.Permissions = make([]manifest.Permission, 2)
m.Permissions = make([]manifest.Permission, 3)
m.Permissions[0].Contract.Type = manifest.PermissionHash
m.Permissions[0].Contract.Value = bc.contracts.NEO.Hash
m.Permissions[0].Methods.Add("balanceOf")
@ -528,6 +542,10 @@ func getTestContractState(bc *Blockchain) (*state.Contract, *state.Contract) {
m.Permissions[1].Contract.Value = util.Uint160{}
m.Permissions[1].Methods.Add("method")
m.Permissions[2].Contract.Type = manifest.PermissionHash
m.Permissions[2].Contract.Value = bc.contracts.GAS.Hash
m.Permissions[2].Methods.Add("refuel")
cs := &state.Contract{
ContractBase: state.ContractBase{
Hash: h,

29
pkg/core/native/native_gas.go
View file

@ -2,14 +2,19 @@ package native
import (
"errors"
"fmt"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
"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/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
"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/stackitem"
)
// GAS represents GAS native contract.
@ -38,6 +43,12 @@ func newGAS() *GAS {
g.nep17TokenNative = *nep17
desc := newDescriptor("refuel", smartcontract.VoidType,
manifest.NewParameter("account", smartcontract.Hash160Type),
manifest.NewParameter("amount", smartcontract.IntegerType))
md := newMethodAndPrice(g.refuel, 1<<15, callflag.States|callflag.AllowNotify)
g.AddMethod(md, desc)
return g
}
@ -68,6 +79,24 @@ func (g *GAS) balanceFromBytes(si *state.StorageItem) (*big.Int, error) {
return &acc.Balance, err
}
func (g *GAS) refuel(ic *interop.Context, args []stackitem.Item) stackitem.Item {
acc := toUint160(args[0])
gas := toBigInt(args[1])
if !gas.IsInt64() || gas.Sign() == -1 {
panic("invalid GAS value")
}
ok, err := runtime.CheckHashedWitness(ic, acc)
if !ok || err != nil {
panic(fmt.Errorf("%w: %v", ErrInvalidWitness, err))
}
g.burn(ic, acc, gas)
ic.VM.GasLimit += gas.Int64()
return stackitem.Null{}
}
// Initialize initializes GAS contract.
func (g *GAS) Initialize(ic *interop.Context) error {
if err := g.nep17TokenNative.Initialize(ic); err != nil {

70
pkg/core/native_gas_test.go Normal file
View file

@ -0,0 +1,70 @@
package core
import (
"math/big"
"testing"
"github.com/nspcc-dev/neo-go/internal/random"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/wallet"
"github.com/stretchr/testify/require"
)
func TestGAS_Refuel(t *testing.T) {
bc := newTestChain(t)
cs, _ := getTestContractState(bc)
require.NoError(t, bc.contracts.Management.PutContractState(bc.dao, cs))
const (
sysFee = 10_000000
burnFee = sysFee + 12345678
)
accs := []*wallet.Account{
newAccountWithGAS(t, bc),
newAccountWithGAS(t, bc),
}
t.Run("good, refuel from self", func(t *testing.T) {
before0 := bc.GetUtilityTokenBalance(accs[0].Contract.ScriptHash())
aer, err := invokeContractMethodGeneric(bc, sysFee, bc.contracts.GAS.Hash, "refuel",
accs[0], accs[0].Contract.ScriptHash(), int64(burnFee))
require.NoError(t, err)
require.Equal(t, vm.HaltState, aer.VMState)
after0 := bc.GetUtilityTokenBalance(accs[0].Contract.ScriptHash())
tx, _, _ := bc.GetTransaction(aer.Container)
require.Equal(t, before0, new(big.Int).Add(after0, big.NewInt(tx.SystemFee+tx.NetworkFee+burnFee)))
})
t.Run("good, refuel from other", func(t *testing.T) {
before0 := bc.GetUtilityTokenBalance(accs[0].Contract.ScriptHash())
before1 := bc.GetUtilityTokenBalance(accs[1].Contract.ScriptHash())
aer, err := invokeContractMethodGeneric(bc, sysFee, cs.Hash, "refuelGas",
accs, accs[1].Contract.ScriptHash(), int64(burnFee), int64(burnFee))
require.NoError(t, err)
require.Equal(t, vm.HaltState, aer.VMState)
after0 := bc.GetUtilityTokenBalance(accs[0].Contract.ScriptHash())
after1 := bc.GetUtilityTokenBalance(accs[1].Contract.ScriptHash())
tx, _, _ := bc.GetTransaction(aer.Container)
require.Equal(t, before0, new(big.Int).Add(after0, big.NewInt(tx.SystemFee+tx.NetworkFee)))
require.Equal(t, before1, new(big.Int).Add(after1, big.NewInt(burnFee)))
})
t.Run("bad, invalid witness", func(t *testing.T) {
aer, err := invokeContractMethodGeneric(bc, sysFee, cs.Hash, "refuelGas",
accs, random.Uint160(), int64(1), int64(1))
require.NoError(t, err)
require.Equal(t, vm.FaultState, aer.VMState)
})
t.Run("bad, invalid GAS amount", func(t *testing.T) {
aer, err := invokeContractMethodGeneric(bc, sysFee, cs.Hash, "refuelGas",
accs, accs[0].Contract.ScriptHash(), int64(0), int64(1))
require.NoError(t, err)
require.Equal(t, vm.FaultState, aer.VMState)
})
}

7
pkg/interop/native/gas/gas.go
View file

@ -37,3 +37,10 @@ func Transfer(from, to interop.Hash160, amount int, data interface{}) bool {
return contract.Call(interop.Hash160(Hash), "transfer",
contract.All, from, to, amount, data).(bool)
}
// Refuel makes some GAS from the provided account available
// for the current execution. It represents `refuel` method of GAS native contract.
func Refuel(from interop.Hash160, amount int) {
contract.Call(interop.Hash160(Hash), "refuel",
contract.States|contract.AllowNotify, from, amount)
}