neo-go/pkg/core/gas_price.go

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package core
import (
"github.com/CityOfZion/neo-go/pkg/smartcontract"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/CityOfZion/neo-go/pkg/vm"
"github.com/CityOfZion/neo-go/pkg/vm/opcode"
)
// interopGasRatio is a multiplier by which a number returned from price getter
// and Fixed8 amount of GAS differ. Numbers defined in syscall tables are a multiple
// of 0.001 GAS = Fixed8(10^5).
const interopGasRatio = 100000
// getPrice returns a price for executing op with the provided parameter.
// Some SYSCALLs have variable price depending on their arguments.
func getPrice(v *vm.VM, op opcode.Opcode, parameter []byte) util.Fixed8 {
if op <= opcode.NOP {
return 0
}
switch op {
case opcode.APPCALL, opcode.TAILCALL:
return util.Fixed8FromInt64(10)
case opcode.SYSCALL:
interopID := vm.GetInteropID(parameter)
return getSyscallPrice(v, interopID)
case opcode.SHA1, opcode.SHA256:
return util.Fixed8FromInt64(10)
case opcode.HASH160, opcode.HASH256:
return util.Fixed8FromInt64(20)
case opcode.CHECKSIG, opcode.VERIFY:
return util.Fixed8FromInt64(100)
case opcode.CHECKMULTISIG:
estack := v.Estack()
if estack.Len() == 0 {
return util.Fixed8FromInt64(1)
}
var cost int
item := estack.Peek(0)
switch item.Item().(type) {
case *vm.ArrayItem, *vm.StructItem:
cost = len(item.Array())
default:
cost = int(item.BigInt().Int64())
}
if cost < 1 {
return util.Fixed8FromInt64(1)
}
return util.Fixed8FromInt64(int64(100 * cost))
default:
return util.Fixed8FromInt64(1)
}
}
// getSyscallPrice returns cost of executing syscall with provided id.
// Is SYSCALL is not found, cost is 1.
func getSyscallPrice(v *vm.VM, id uint32) util.Fixed8 {
ifunc := v.GetInteropByID(id)
if ifunc != nil && ifunc.Price > 0 {
return util.Fixed8(ifunc.Price) * interopGasRatio
}
const (
neoAssetCreate = 0x1fc6c583 // Neo.Asset.Create
antSharesAssetCreate = 0x99025068 // AntShares.Asset.Create
neoAssetRenew = 0x71908478 // Neo.Asset.Renew
antSharesAssetRenew = 0xaf22447b // AntShares.Asset.Renew
neoContractCreate = 0x6ea56cf6 // Neo.Contract.Create
neoContractMigrate = 0x90621b47 // Neo.Contract.Migrate
antSharesContractCreate = 0x2a28d29b // AntShares.Contract.Create
antSharesContractMigrate = 0xa934c8bb // AntShares.Contract.Migrate
systemStoragePut = 0x84183fe6 // System.Storage.Put
systemStoragePutEx = 0x3a9be173 // System.Storage.PutEx
neoStoragePut = 0xf541a152 // Neo.Storage.Put
antSharesStoragePut = 0x5f300a9e // AntShares.Storage.Put
)
estack := v.Estack()
switch id {
case neoAssetCreate, antSharesAssetCreate:
return util.Fixed8FromInt64(5000)
case neoAssetRenew, antSharesAssetRenew:
arg := estack.Peek(1).BigInt().Int64()
return util.Fixed8FromInt64(arg * 5000)
case neoContractCreate, neoContractMigrate, antSharesContractCreate, antSharesContractMigrate:
fee := int64(100)
props := smartcontract.PropertyState(estack.Peek(3).BigInt().Int64())
if props&smartcontract.HasStorage != 0 {
fee += 400
}
if props&smartcontract.HasDynamicInvoke != 0 {
fee += 500
}
return util.Fixed8FromInt64(fee)
case systemStoragePut, systemStoragePutEx, neoStoragePut, antSharesStoragePut:
// price for storage PUT is 1 GAS per 1 KiB
keySize := len(estack.Peek(1).Bytes())
valSize := len(estack.Peek(2).Bytes())
return util.Fixed8FromInt64(int64((keySize+valSize-1)/1024 + 1))
default:
return util.Fixed8FromInt64(1)
}
}