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Calculating interop prices can be tricky. It is more convenitent to burn gas inside interops where necessary parameters are popped.
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
package core
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import (
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// interopGasRatio is a multiplier by which a number returned from price getter
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// and Fixed8 amount of GAS differ. Numbers defined in syscall tables are a multiple
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// of 0.001 GAS = Fixed8(10^5).
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const interopGasRatio = 100000
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// StoragePrice is a price for storing 1 byte of storage.
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const StoragePrice = 100000
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// getPrice returns a price for executing op with the provided parameter.
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// Some SYSCALLs have variable price depending on their arguments.
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func getPrice(v *vm.VM, op opcode.Opcode, parameter []byte) util.Fixed8 {
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if op <= opcode.NOP {
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return 0
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}
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switch op {
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case opcode.SYSCALL:
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interopID := vm.GetInteropID(parameter)
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return getSyscallPrice(v, interopID)
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default:
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return toFixed8(1)
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}
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}
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func toFixed8(n int64) util.Fixed8 {
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return util.Fixed8(n * interopGasRatio)
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}
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// getSyscallPrice returns cost of executing syscall with provided id.
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// Is SYSCALL is not found, cost is 1.
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func getSyscallPrice(v *vm.VM, id uint32) util.Fixed8 {
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ifunc := v.GetInteropByID(id)
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if ifunc != nil && ifunc.Price > 0 {
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return toFixed8(int64(ifunc.Price))
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}
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const (
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systemStoragePut = 0x84183fe6 // System.Storage.Put
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systemStoragePutEx = 0x3a9be173 // System.Storage.PutEx
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neoStoragePut = 0xf541a152 // Neo.Storage.Put
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)
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estack := v.Estack()
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switch id {
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case systemStoragePut, systemStoragePutEx, neoStoragePut:
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// price for storage PUT is 1 GAS per 1 KiB
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keySize := len(estack.Peek(1).Bytes())
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valSize := len(estack.Peek(2).Bytes())
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return util.Fixed8FromInt64(int64((keySize+valSize-1)/1024 + 1))
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default:
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return util.Fixed8FromInt64(1)
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}
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}
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