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https://github.com/LBRYFoundation/lbcd.git
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17da2ba7fa
This change moves IsFinalizedTransaction to txscript and also changes the first argument to take a wire.MsgTx instead of btcutil.Tx. This is needed for an upcoming diff in which txscript will require IsFinalizedTransaction and we do not want to import the btcd/blockchain.
54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright (c) 2015 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 txscript
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import (
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"math"
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"time"
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"github.com/btcsuite/btcd/wire"
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)
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const (
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// LockTimeThreshold is the number below which a lock time is
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// interpreted to be a block number. Since an average of one block
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// is generated per 10 minutes, this allows blocks for about 9,512
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// years. However, if the field is interpreted as a timestamp, given
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// the lock time is a uint32, the max is sometime around 2106.
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LockTimeThreshold uint32 = 5e8 // Tue Nov 5 00:53:20 1985 UTC
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)
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// IsFinalizedTransaction determines whether or not a transaction is finalized.
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func IsFinalizedTransaction(msgTx *wire.MsgTx, blockHeight int64, blockTime time.Time) bool {
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// Lock time of zero means the transaction is finalized.
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lockTime := msgTx.LockTime
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if lockTime == 0 {
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return true
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}
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// The lock time field of a transaction is either a block height at
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// which the transaction is finalized or a timestamp depending on if the
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// value is before the LockTimeThreshold. When it is under the
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// threshold it is a block height.
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blockTimeOrHeight := int64(0)
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if lockTime < LockTimeThreshold {
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blockTimeOrHeight = blockHeight
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} else {
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blockTimeOrHeight = blockTime.Unix()
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}
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if int64(lockTime) < blockTimeOrHeight {
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return true
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}
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// At this point, the transaction's lock time hasn't occured yet, but
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// the transaction might still be finalized if the sequence number
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// for all transaction inputs is maxed out.
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for _, txIn := range msgTx.TxIn {
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if txIn.Sequence != math.MaxUint32 {
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return false
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}
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}
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return true
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}
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