69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
// Copyright (c) 2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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// Package txrules provides transaction rules that should be followed by
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// transaction authors for wide mempool acceptance and quick mining.
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package txrules
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import (
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"errors"
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"github.com/lbryio/lbcd/mempool"
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"github.com/lbryio/lbcd/txscript"
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"github.com/lbryio/lbcd/wire"
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btcutil "github.com/lbryio/lbcutil"
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)
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// DefaultRelayFeePerKb is the default minimum relay fee policy for a mempool.
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const DefaultRelayFeePerKb btcutil.Amount = 1e3
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// IsDustOutput determines whether a transaction output is considered dust.
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// Transactions with dust outputs are not standard and are rejected by mempools
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// with default policies.
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func IsDustOutput(output *wire.TxOut, relayFeePerKb btcutil.Amount) bool {
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// Unspendable outputs which solely carry data are not checked for dust.
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if txscript.GetScriptClass(output.PkScript) == txscript.NullDataTy {
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return false
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}
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return mempool.IsDust(output, relayFeePerKb)
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}
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// Transaction rule violations
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var (
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ErrAmountNegative = errors.New("transaction output amount is negative")
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ErrAmountExceedsMax = errors.New("transaction output amount exceeds maximum value")
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ErrOutputIsDust = errors.New("transaction output is dust")
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)
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// CheckOutput performs simple consensus and policy tests on a transaction
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// output.
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func CheckOutput(output *wire.TxOut, relayFeePerKb btcutil.Amount) error {
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if output.Value < 0 {
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return ErrAmountNegative
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}
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if output.Value > btcutil.MaxSatoshi {
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return ErrAmountExceedsMax
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}
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if IsDustOutput(output, relayFeePerKb) {
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return ErrOutputIsDust
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}
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return nil
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}
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// FeeForSerializeSize calculates the required fee for a transaction of some
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// arbitrary size given a mempool's relay fee policy.
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func FeeForSerializeSize(relayFeePerKb btcutil.Amount, txSerializeSize int) btcutil.Amount {
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fee := relayFeePerKb * btcutil.Amount(txSerializeSize) / 1000
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if fee == 0 && relayFeePerKb > 0 {
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fee = relayFeePerKb
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}
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if fee < 0 || fee > btcutil.MaxSatoshi {
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fee = btcutil.MaxSatoshi
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}
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return fee
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}
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