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blockchain: add new LockTimeToSequence function

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This commit adds a new function to the package: `LockTimeToSequence`.
The function is a simple utility function which aides the caller to
mapping a targeted time or block based relative lock-time to the
appropriate sequence number.
This commit is contained in:
Olaoluwa Osuntokun 2016-08-24 14:12:13 -07:00
parent 1914200080
commit de709f28f6
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GPG key ID: 9CC5B105D03521A2
1 changed files with 18 additions and 0 deletions
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18
blockchain/chain.go
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@ -828,6 +828,24 @@ func (b *BlockChain) calcSequenceLock(tx *btcutil.Tx, utxoView *UtxoViewpoint,
return sequenceLock, nil
}
// LockTimeToSequence converts the passed relative locktime to a sequence
// number in accordance to BIP-68.
// See: https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki
// * (Compatibility)
func LockTimeToSequence(isSeconds bool, locktime uint32) uint32 {
// If we're expressing the relative lock time in blocks, then the
// corresponding sequence number is simply the desired input age.
if !isSeconds {
return locktime
}
// Set the 22nd bit which indicates the lock time is in seconds, then
// shift the locktime over by 9 since the time granularity is in
// 512-second intervals (2^9). This results in a max lock-time of
// 33,553,920 seconds, or 1.1 years.
return wire.SequenceLockTimeIsSeconds | uint32(locktime>>wire.SequenceLockTimeGranularity)
}
// getReorganizeNodes finds the fork point between the main chain and the passed
// node and returns a list of block nodes that would need to be detached from
// the main chain and a list of block nodes that would need to be attached to