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htlcswitch/switch: clarify paymentID uniqueness

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With the following commits, it'll become important to not resuse
paymentIDs, since there is no way to tell whether the HTLC in question
has already been forwarded and settled/failed.

We clarify this in the SendHTLC comments, and alter the tests to not
attempt to resend an HTLC with a duplicate payment ID.
This commit is contained in:
Johan T. Halseth 2019-05-16 15:27:28 +02:00
parent bbbe3a37f5
commit cff4d3547d
No known key found for this signature in database
GPG Key ID: 15BAADA29DA20D26
2 changed files with 3 additions and 28 deletions
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3
htlcswitch/switch.go
View File

@ -348,7 +348,8 @@ func (s *Switch) ProcessContractResolution(msg contractcourt.ResolutionMsg) erro
// SendHTLC is used by other subsystems which aren't belong to htlc switch
// package in order to send the htlc update. The paymentID used MUST be unique
// for this HTLC, otherwise the switch might reject it.
// for this HTLC, and MUST be used only once, otherwise the switch might reject
// it.
func (s *Switch) SendHTLC(firstHop lnwire.ShortChannelID, paymentID uint64,
htlc *lnwire.UpdateAddHTLC,
deobfuscator ErrorDecrypter) ([sha256.Size]byte, error) {

28
htlcswitch/switch_test.go
View File

@ -1748,16 +1748,6 @@ func TestSwitchSendPayment(t *testing.T) {
errChan <- err
}()
go func() {
// Send the payment with the same payment hash and same
// amount and check that it will be propagated successfully
_, err := s.SendHTLC(
aliceChannelLink.ShortChanID(), 0, update,
newMockDeobfuscator(),
)
errChan <- err
}()
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
@ -1765,29 +1755,13 @@ func TestSwitchSendPayment(t *testing.T) {
}
case err := <-errChan:
if err != ErrPaymentInFlight {
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
select {
case packet := <-aliceChannelLink.packets:
if err := aliceChannelLink.completeCircuit(packet); err != nil {
t.Fatalf("unable to complete payment circuit: %v", err)
}
case err := <-errChan:
t.Fatalf("unable to send payment: %v", err)
case <-time.After(time.Second):
t.Fatal("request was not propagated to destination")
}
if s.numPendingPayments() != 1 {
t.Fatal("wrong amount of pending payments")
}
if s.circuits.NumOpen() != 1 {
t.Fatal("wrong amount of circuits")
}