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htlcswitch: refactor handleLocalDispatch

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Split handleLocalDispatch into an extra handleLocalAddHTLC function so
we can easily notify an error should one occur adding the htlc.
This commit is contained in:
carla 2020-02-19 17:34:47 +02:00
parent fc0ee06a99
commit 937062b6d3
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GPG key ID: 4CA7FE54A6213C91
1 changed files with 43 additions and 31 deletions
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74
htlcswitch/switch.go
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@ -768,38 +768,9 @@ func (s *Switch) handleLocalDispatch(pkt *htlcPacket) error {
// User have created the htlc update therefore we should find the
// appropriate channel link and send the payment over this link.
if htlc, ok := pkt.htlc.(*lnwire.UpdateAddHTLC); ok {
// Try to find links by node destination.
s.indexMtx.RLock()
link, err := s.getLinkByShortID(pkt.outgoingChanID)
s.indexMtx.RUnlock()
link, err := s.handleLocalAddHTLC(pkt, htlc)
if err != nil {
log.Errorf("Link %v not found", pkt.outgoingChanID)
return NewLinkError(&lnwire.FailUnknownNextPeer{})
}
if !link.EligibleToForward() {
log.Errorf("Link %v is not available to forward",
pkt.outgoingChanID)
// The update does not need to be populated as the error
// will be returned back to the router.
return NewDetailedLinkError(
lnwire.NewTemporaryChannelFailure(nil),
OutgoingFailureLinkNotEligible,
)
}
// Ensure that the htlc satisfies the outgoing channel policy.
currentHeight := atomic.LoadUint32(&s.bestHeight)
htlcErr := link.CheckHtlcTransit(
htlc.PaymentHash,
htlc.Amount,
htlc.Expiry, currentHeight,
)
if htlcErr != nil {
log.Errorf("Link %v policy for local forward not "+
"satisfied", pkt.outgoingChanID)
return htlcErr
return err
}
return link.HandleSwitchPacket(pkt)
@ -811,6 +782,47 @@ func (s *Switch) handleLocalDispatch(pkt *htlcPacket) error {
return nil
}
// handleLocalAddHTLC handles the addition of a htlc for a send that
// originates from our node. It returns the link that the htlc should
// be forwarded outwards on, and a link error if the htlc cannot be
// forwarded.
func (s *Switch) handleLocalAddHTLC(pkt *htlcPacket,
htlc *lnwire.UpdateAddHTLC) (ChannelLink, *LinkError) {
// Try to find links by node destination.
s.indexMtx.RLock()
link, err := s.getLinkByShortID(pkt.outgoingChanID)
s.indexMtx.RUnlock()
if err != nil {
log.Errorf("Link %v not found", pkt.outgoingChanID)
return nil, NewLinkError(&lnwire.FailUnknownNextPeer{})
}
if !link.EligibleToForward() {
log.Errorf("Link %v is not available to forward",
pkt.outgoingChanID)
// The update does not need to be populated as the error
// will be returned back to the router.
return nil, NewDetailedLinkError(
lnwire.NewTemporaryChannelFailure(nil),
OutgoingFailureLinkNotEligible,
)
}
// Ensure that the htlc satisfies the outgoing channel policy.
currentHeight := atomic.LoadUint32(&s.bestHeight)
htlcErr := link.CheckHtlcTransit(
htlc.PaymentHash, htlc.Amount, htlc.Expiry, currentHeight,
)
if htlcErr != nil {
log.Errorf("Link %v policy for local forward not "+
"satisfied", pkt.outgoingChanID)
return nil, htlcErr
}
return link, nil
}
// handleLocalResponse processes a Settle or Fail responding to a
// locally-initiated payment. This is handled asynchronously to avoid blocking
// the main event loop within the switch, as these operations can require