breachabirter+contraccourt: convert ProcessACK to function closure
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@ -46,17 +46,19 @@ var (
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// ContractBreachEvent is an event the breachArbiter will receive in case a
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// contract breach is observed on-chain. It contains the necessary information
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// to handle the breach, and a ProcessACK channel we will use to ACK the event
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// to handle the breach, and a ProcessACK closure we will use to ACK the event
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// when we have safely stored all the necessary information.
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type ContractBreachEvent struct {
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// ChanPoint is the channel point of the breached channel.
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ChanPoint wire.OutPoint
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// ProcessACK is an error channel where a nil error should be sent
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// iff the breach retribution info is safely stored in the retribution
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// ProcessACK is an closure that should be called with a nil error iff
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// the breach retribution info is safely stored in the retribution
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// store. In case storing the information to the store fails, a non-nil
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// error should be sent.
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ProcessACK chan error
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// error should be used. When this closure returns, it means that the
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// contract court has marked the channel pending close in the DB, and
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// it is safe for the BreachArbiter to carry on its duty.
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ProcessACK func(error)
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// BreachRetribution is the information needed to act on this contract
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// breach.
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@ -745,10 +747,8 @@ func (b *breachArbiter) handleBreachHandoff(breachEvent *ContractBreachEvent) {
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b.Unlock()
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brarLog.Errorf("Unable to check breach info in DB: %v", err)
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select {
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case breachEvent.ProcessACK <- err:
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case <-b.quit:
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}
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// Notify about the failed lookup and return.
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breachEvent.ProcessACK(err)
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return
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}
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@ -757,11 +757,7 @@ func (b *breachArbiter) handleBreachHandoff(breachEvent *ContractBreachEvent) {
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// case we can safely ACK the handoff, and return.
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if breached {
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b.Unlock()
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select {
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case breachEvent.ProcessACK <- nil:
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case <-b.quit:
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}
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breachEvent.ProcessACK(nil)
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return
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}
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@ -782,14 +778,10 @@ func (b *breachArbiter) handleBreachHandoff(breachEvent *ContractBreachEvent) {
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// acknowledgment back to the close observer with the error. If
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// the ack is successful, the close observer will mark the
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// channel as pending-closed in the channeldb.
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select {
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case breachEvent.ProcessACK <- err:
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// Bail if we failed to persist retribution info.
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if err != nil {
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return
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}
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breachEvent.ProcessACK(err)
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case <-b.quit:
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// Bail if we failed to persist retribution info.
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if err != nil {
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return
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}
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@ -1059,9 +1059,12 @@ func TestBreachHandoffSuccess(t *testing.T) {
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// Signal a spend of the funding transaction and wait for the close
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// observer to exit.
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processACK := make(chan error)
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breach := &ContractBreachEvent{
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ChanPoint: *chanPoint,
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ProcessACK: make(chan error, 1),
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ChanPoint: *chanPoint,
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ProcessACK: func(brarErr error) {
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processACK <- brarErr
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},
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BreachRetribution: &lnwallet.BreachRetribution{
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BreachTransaction: bobClose.CloseTx,
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LocalOutputSignDesc: &input.SignDescriptor{
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@ -1075,7 +1078,7 @@ func TestBreachHandoffSuccess(t *testing.T) {
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// We'll also wait to consume the ACK back from the breach arbiter.
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select {
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case err := <-breach.ProcessACK:
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case err := <-processACK:
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if err != nil {
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t.Fatalf("handoff failed: %v", err)
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}
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@ -1092,8 +1095,10 @@ func TestBreachHandoffSuccess(t *testing.T) {
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// already ACKed, the breach arbiter should immediately ACK and ignore
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// this event.
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breach = &ContractBreachEvent{
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ChanPoint: *chanPoint,
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ProcessACK: make(chan error, 1),
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ChanPoint: *chanPoint,
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ProcessACK: func(brarErr error) {
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processACK <- brarErr
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},
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BreachRetribution: &lnwallet.BreachRetribution{
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BreachTransaction: bobClose.CloseTx,
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LocalOutputSignDesc: &input.SignDescriptor{
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@ -1108,7 +1113,7 @@ func TestBreachHandoffSuccess(t *testing.T) {
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// We'll also wait to consume the ACK back from the breach arbiter.
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select {
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case err := <-breach.ProcessACK:
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case err := <-processACK:
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if err != nil {
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t.Fatalf("handoff failed: %v", err)
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}
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@ -1140,9 +1145,12 @@ func TestBreachHandoffFail(t *testing.T) {
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// Signal the notifier to dispatch spend notifications of the funding
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// transaction using the transaction from bob's closing summary.
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chanPoint := alice.ChanPoint
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processACK := make(chan error)
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breach := &ContractBreachEvent{
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ChanPoint: *chanPoint,
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ProcessACK: make(chan error, 1),
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ChanPoint: *chanPoint,
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ProcessACK: func(brarErr error) {
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processACK <- brarErr
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},
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BreachRetribution: &lnwallet.BreachRetribution{
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BreachTransaction: bobClose.CloseTx,
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LocalOutputSignDesc: &input.SignDescriptor{
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@ -1156,7 +1164,7 @@ func TestBreachHandoffFail(t *testing.T) {
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// We'll also wait to consume the ACK back from the breach arbiter.
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select {
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case err := <-breach.ProcessACK:
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case err := <-processACK:
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if err == nil {
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t.Fatalf("breach write should have failed")
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}
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@ -1181,8 +1189,10 @@ func TestBreachHandoffFail(t *testing.T) {
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// Signal a spend of the funding transaction and wait for the close
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// observer to exit. This time we are allowing the handoff to succeed.
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breach = &ContractBreachEvent{
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ChanPoint: *chanPoint,
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ProcessACK: make(chan error, 1),
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ChanPoint: *chanPoint,
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ProcessACK: func(brarErr error) {
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processACK <- brarErr
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},
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BreachRetribution: &lnwallet.BreachRetribution{
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BreachTransaction: bobClose.CloseTx,
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LocalOutputSignDesc: &input.SignDescriptor{
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@ -1196,7 +1206,7 @@ func TestBreachHandoffFail(t *testing.T) {
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contractBreaches <- breach
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select {
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case err := <-breach.ProcessACK:
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case err := <-processACK:
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if err != nil {
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t.Fatalf("handoff failed: %v", err)
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}
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@ -1399,16 +1409,19 @@ func testBreachSpends(t *testing.T, test breachTest) {
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t.Fatalf("unable to create breach retribution: %v", err)
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}
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processACK := make(chan error)
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breach := &ContractBreachEvent{
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ChanPoint: *chanPoint,
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ProcessACK: make(chan error, 1),
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ChanPoint: *chanPoint,
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ProcessACK: func(brarErr error) {
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processACK <- brarErr
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},
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BreachRetribution: retribution,
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}
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contractBreaches <- breach
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// We'll also wait to consume the ACK back from the breach arbiter.
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select {
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case err := <-breach.ProcessACK:
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case err := <-processACK:
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if err != nil {
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t.Fatalf("handoff failed: %v", err)
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}
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17
server.go
17
server.go
@ -950,9 +950,22 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
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IsOurAddress: cc.Wallet.IsOurAddress,
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ContractBreach: func(chanPoint wire.OutPoint,
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breachRet *lnwallet.BreachRetribution) error {
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// processACK will handle the breachArbiter ACKing the
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// event.
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finalErr := make(chan error, 1)
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processACK := func(brarErr error) {
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if brarErr != nil {
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finalErr <- brarErr
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return
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}
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finalErr <- nil
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}
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event := &ContractBreachEvent{
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ChanPoint: chanPoint,
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ProcessACK: make(chan error, 1),
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ProcessACK: processACK,
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BreachRetribution: breachRet,
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}
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@ -965,7 +978,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
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// Wait for the breachArbiter to ACK the event.
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select {
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case err := <-event.ProcessACK:
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case err := <-finalErr:
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return err
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case <-s.quit:
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return ErrServerShuttingDown
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