59 lines
1.6 KiB
Go
59 lines
1.6 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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// 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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