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channeldb: define new channel type, SingleFunderTweakless

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In this commit, we define a new channel type: SingleFunderTweakless.
We'll use this channel type to denote channels with commitments that
don't tweak the remote party's key in their non-delay output.
This commit is contained in:
Olaoluwa Osuntokun 2019-07-31 19:59:32 -07:00
parent bee777ab5f
commit 21133e1856
No known key found for this signature in database
GPG Key ID: BC13F65E2DC84465
1 changed files with 21 additions and 4 deletions
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25
channeldb/channel.go
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@ -135,14 +135,31 @@ const (
// SingleFunder represents a channel wherein one party solely funds the
// entire capacity of the channel.
SingleFunder = 0
SingleFunder ChannelType = 0
// DualFunder represents a channel wherein both parties contribute
// funds towards the total capacity of the channel. The channel may be
// funded symmetrically or asymmetrically.
DualFunder = 1
DualFunder ChannelType = 1
// SingleFunderTweakless is similar to the basic SingleFunder channel
// type, but it omits the tweak for one's key in the commitment
// transaction of the remote party.
SingleFunderTweakless ChannelType = 2
)
// IsSingleFunder returns true if the channel type if one of the known single
// funder variants.
func (c ChannelType) IsSingleFunder() bool {
return c == SingleFunder || c == SingleFunderTweakless
}
// IsTweakless returns true if the target channel uses a commitment that
// doesn't tweak the key for the remote party.
func (c ChannelType) IsTweakless() bool {
return c == SingleFunderTweakless
}
// ChannelConstraints represents a set of constraints meant to allow a node to
// limit their exposure, enact flow control and ensure that all HTLCs are
// economically relevant. This struct will be mirrored for both sides of the
@ -2506,7 +2523,7 @@ func putChanInfo(chanBucket *bbolt.Bucket, channel *OpenChannel) error {
}
// For single funder channels that we initiated, write the funding txn.
if channel.ChanType == SingleFunder && channel.IsInitiator &&
if channel.ChanType.IsSingleFunder() && channel.IsInitiator &&
!channel.hasChanStatus(ChanStatusRestored) {
if err := WriteElement(&w, channel.FundingTxn); err != nil {
@ -2628,7 +2645,7 @@ func fetchChanInfo(chanBucket *bbolt.Bucket, channel *OpenChannel) error {
}
// For single funder channels that we initiated, read the funding txn.
if channel.ChanType == SingleFunder && channel.IsInitiator &&
if channel.ChanType.IsSingleFunder() && channel.IsInitiator &&
!channel.hasChanStatus(ChanStatusRestored) {
if err := ReadElement(r, &channel.FundingTxn); err != nil {