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routing: remove errNoRoute and lastError

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Now that SendToRoute is no longer using the payment lifecycle, we
remove the error structs and vars used to cache the last encountered
error. For SendToRoute this will now be returned directly after a shard
has failed.

For SendPayment this means that the last error encountered durinng
pathfinding no longer will be returned. All errors encounterd can
instead be inspected from the HTLC list.
This commit is contained in:
Johan T. Halseth 2020-04-01 00:13:24 +02:00
parent 6cc162e0b0
commit a979b91b27
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GPG Key ID: 15BAADA29DA20D26
2 changed files with 24 additions and 28 deletions
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27
routing/payment_lifecycle.go
View File

@ -13,20 +13,6 @@ import (
"github.com/lightningnetwork/lnd/routing/route"
)
// errNoRoute is returned when all routes from the payment session have been
// attempted.
type errNoRoute struct {
// lastError is the error encountered during the last payment attempt,
// if at least one attempt has been made.
lastError error
}
// Error returns a string representation of the error.
func (e errNoRoute) Error() string {
return fmt.Sprintf("unable to route payment to destination: %v",
e.lastError)
}
// paymentLifecycle holds all information about the current state of a payment
// needed to resume if from any point.
type paymentLifecycle struct {
@ -146,14 +132,6 @@ func (p *paymentLifecycle) resumePayment() ([32]byte, *route.Route, error) {
return [32]byte{}, nil, saveErr
}
// If there was an error already recorded for this
// payment, we'll return that.
if shardHandler.lastError != nil {
return [32]byte{}, nil, errNoRoute{
lastError: shardHandler.lastError,
}
}
// Terminal state, return.
return [32]byte{}, nil, err
}
@ -232,8 +210,6 @@ func (p *paymentLifecycle) resumePayment() ([32]byte, *route.Route, error) {
type shardHandler struct {
paymentHash lntypes.Hash
router *ChannelRouter
lastError error
}
// launchOutcome is a type returned from launchShard that indicates whether the
@ -542,9 +518,6 @@ func (p *shardHandler) handleSendError(attempt *channeldb.HTLCAttemptInfo,
attempt.AttemptID, &attempt.Route, sendErr,
)
if reason == nil {
// Save the forwarding error so it can be returned if
// this turns out to be the last attempt.
p.lastError = sendErr
return nil
}

25
routing/router_test.go
View File

@ -792,10 +792,33 @@ func TestSendPaymentErrorPathPruning(t *testing.T) {
// The final error returned should also indicate that the peer wasn't
// online (the last error we returned).
if !strings.Contains(err.Error(), "UnknownNextPeer") {
// TODO: proper err code
if !strings.Contains(err.Error(), "unable to find") {
t.Fatalf("expected UnknownNextPeer instead got: %v", err)
}
// Inspect the two attempts that were made before the payment failed.
p, err := ctx.router.cfg.Control.FetchPayment(payHash)
if err != nil {
t.Fatal(err)
}
if len(p.HTLCs) != 2 {
t.Fatalf("expected two attempts got %v", len(p.HTLCs))
}
// We expect the first attempt to have failed with a
// TemporaryChannelFailure, the second with UnknownNextPeer.
msg := p.HTLCs[0].Failure.Message
if _, ok := msg.(*lnwire.FailTemporaryChannelFailure); !ok {
t.Fatalf("unexpected fail message: %T", msg)
}
msg = p.HTLCs[1].Failure.Message
if _, ok := msg.(*lnwire.FailUnknownNextPeer); !ok {
t.Fatalf("unexpected fail message: %T", msg)
}
ctx.router.cfg.MissionControl.(*MissionControl).ResetHistory()
// Next, we'll modify the SendToSwitch method to indicate that the