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cnct: create channel interface for arbitrator

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Allows unit testing of the channel arbitrator with fewer dependencies.
This is a preparation for the addition of anchor sweeping.
This commit is contained in:
Joost Jager
2020-01-24 09:38:24 +01:00
parent c0b1b3be14
commit 7f3d4e7d49
3 changed files with 94 additions and 49 deletions
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26
contractcourt/channel_arbitrator.go
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@@ -64,6 +64,18 @@ type WitnessBeacon interface {
AddPreimages(preimages ...lntypes.Preimage) error
}
// ArbChannel is an abstraction that allows the channel arbitrator to interact
// with an open channel.
type ArbChannel interface {
// ForceCloseChan should force close the contract that this attendant
// is watching over. We'll use this when we decide that we need to go
// to chain. It should in addition tell the switch to remove the
// corresponding link, such that we won't accept any new updates. The
// returned summary contains all items needed to eventually resolve all
// outputs on chain.
ForceCloseChan() (*lnwallet.LocalForceCloseSummary, error)
}
// ChannelArbitratorConfig contains all the functionality that the
// ChannelArbitrator needs in order to properly arbitrate any contract dispute
// on chain.
@@ -72,6 +84,10 @@ type ChannelArbitratorConfig struct {
// channel.
ChanPoint wire.OutPoint
// Channel is the full channel data structure. For legacy channels, this
// field may not always be set after a restart.
Channel ArbChannel
// ShortChanID describes the exact location of the channel within the
// chain. We'll use this to address any messages that we need to send
// to the switch during contract resolution.
@@ -88,14 +104,6 @@ type ChannelArbitratorConfig struct {
// channel.
ChainEvents *ChainEventSubscription
// ForceCloseChan should force close the contract that this attendant
// is watching over. We'll use this when we decide that we need to go
// to chain. It should in addition tell the switch to remove the
// corresponding link, such that we won't accept any new updates. The
// returned summary contains all items needed to eventually resolve all
// outputs on chain.
ForceCloseChan func() (*lnwallet.LocalForceCloseSummary, error)
// MarkCommitmentBroadcasted should mark the channel as the commitment
// being broadcast, and we are waiting for the commitment to confirm.
MarkCommitmentBroadcasted func(*wire.MsgTx, bool) error
@@ -791,7 +799,7 @@ func (c *ChannelArbitrator) stateStep(
// We'll tell the switch that it should remove the link for
// this channel, in addition to fetching the force close
// summary needed to close this channel on chain.
closeSummary, err := c.cfg.ForceCloseChan()
closeSummary, err := c.cfg.Channel.ForceCloseChan()
if err != nil {
log.Errorf("ChannelArbitrator(%v): unable to "+
"force close: %v", c.cfg.ChanPoint, err)