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41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
package fee
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import (
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
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// ECDSAVerifyPrice is a gas price of a single verification.
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const ECDSAVerifyPrice = 1 << 15
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// Calculate returns network fee for transaction
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func Calculate(base int64, script []byte) (int64, int) {
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var (
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netFee int64
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size int
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)
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if vm.IsSignatureContract(script) {
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size += 67 + io.GetVarSize(script)
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netFee += Opcode(base, opcode.PUSHDATA1, opcode.PUSHDATA1) + base*ECDSAVerifyPrice
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} else if m, pubs, ok := vm.ParseMultiSigContract(script); ok {
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n := len(pubs)
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sizeInv := 66 * m
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size += io.GetVarSize(sizeInv) + sizeInv + io.GetVarSize(script)
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netFee += calculateMultisig(base, m) + calculateMultisig(base, n)
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netFee += base * ECDSAVerifyPrice * int64(n)
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} else {
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// We can support more contract types in the future.
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}
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return netFee, size
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}
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func calculateMultisig(base int64, n int) int64 {
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result := Opcode(base, opcode.PUSHDATA1) * int64(n)
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bw := io.NewBufBinWriter()
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emit.Int(bw.BinWriter, int64(n))
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// it's a hack because coefficients of small PUSH* opcodes are equal
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result += Opcode(base, opcode.Opcode(bw.Bytes()[0]))
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return result
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}
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