neo-go/pkg/core/fee/calculate.go

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