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routing/payment_lifecycle: extract result collection into collectResult
Fetching the final shard result will also be done for calls to SendToRoute, so we extract this code into a new method. We move the call to the ControlTower to set the payment level failure out into the payment loop, as this must be handled differently when multiple shards are in flight, and for SendToRoute.
This commit is contained in:
Johan T. Halseth
parent
9712dd1a7f
commit
2c01e79eb5
@ -202,124 +202,28 @@ func (p *paymentLifecycle) resumePayment() ([32]byte, *route.Route, error) {
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}
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}
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// Regenerate the circuit for this attempt.
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_, circuit, err := generateSphinxPacket(
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&attempt.Route, p.paymentHash[:], attempt.SessionKey,
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)
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// Whether this was an existing attempt or one we just sent,
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// we'll now collect its result. We ignore the result for now
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// if it is a success, as we will look it up in the control
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// tower on the next loop iteration.
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result, err := shardHandler.collectResult(attempt)
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if err != nil {
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return [32]byte{}, nil, err
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}
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// Using the created circuit, initialize the error decrypter so we can
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// parse+decode any failures incurred by this payment within the
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// switch.
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errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
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OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(circuit),
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}
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// Now ask the switch to return the result of the payment when
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// available.
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resultChan, err := p.router.cfg.Payer.GetPaymentResult(
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attempt.AttemptID, p.paymentHash, errorDecryptor,
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)
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switch {
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// If this attempt ID is unknown to the Switch, it means it was
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// never checkpointed and forwarded by the switch before a
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// restart. In this case we can safely send a new payment
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// attempt, and wait for its result to be available.
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case err == htlcswitch.ErrPaymentIDNotFound:
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log.Debugf("Payment ID %v for hash %x not found in "+
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"the Switch, retrying.", attempt.AttemptID,
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p.paymentHash)
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err = shardHandler.failAttempt(attempt, err)
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if err != nil {
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return [32]byte{}, nil, err
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}
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// Reset the attempt to indicate we want to make a new
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// attempt.
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continue
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// A critical, unexpected error was encountered.
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case err != nil:
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log.Errorf("Failed getting result for attemptID %d "+
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"from switch: %v", attempt.AttemptID, err)
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return [32]byte{}, nil, err
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}
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// The switch knows about this payment, we'll wait for a result
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// to be available.
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var (
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result *htlcswitch.PaymentResult
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ok bool
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)
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select {
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case result, ok = <-resultChan:
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if !ok {
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return [32]byte{}, nil, htlcswitch.ErrSwitchExiting
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}
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case <-p.router.quit:
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return [32]byte{}, nil, ErrRouterShuttingDown
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}
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// In case of a payment failure, we use the error to decide
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// whether we should retry.
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if result.Error != nil {
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log.Errorf("Attempt to send payment %x failed: %v",
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p.paymentHash, result.Error)
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err = shardHandler.failAttempt(attempt, result.Error)
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if err != nil {
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return [32]byte{}, nil, err
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}
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if result.err != nil {
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// We must inspect the error to know whether it was
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// critical or not, to decide whether we should
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// continue trying.
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err := shardHandler.handleSendError(
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attempt, result.Error,
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)
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err = shardHandler.handleSendError(attempt, result.err)
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if err != nil {
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return [32]byte{}, nil, err
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}
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// Error was handled successfully, reset the attempt to
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// indicate we want to make a new attempt.
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// Error was handled successfully, continue to make a
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// new attempt.
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continue
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}
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// We successfully got a payment result back from the switch.
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log.Debugf("Payment %x succeeded with pid=%v",
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p.paymentHash, attempt.AttemptID)
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// Report success to mission control.
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err = p.router.cfg.MissionControl.ReportPaymentSuccess(
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attempt.AttemptID, &attempt.Route,
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)
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if err != nil {
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log.Errorf("Error reporting payment success to mc: %v",
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err)
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}
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// In case of success we atomically store the db payment and
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// move the payment to the success state.
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err = p.router.cfg.Control.SettleAttempt(
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p.paymentHash, attempt.AttemptID,
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&channeldb.HTLCSettleInfo{
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Preimage: result.Preimage,
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SettleTime: p.router.cfg.Clock.Now(),
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},
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)
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if err != nil {
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log.Errorf("Unable to succeed payment "+
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"attempt: %v", err)
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return [32]byte{}, nil, err
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}
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}
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}
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@ -391,6 +295,136 @@ func (p *shardHandler) launchShard(rt *route.Route) (*channeldb.HTLCAttemptInfo,
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return attempt, &launchOutcome{}, nil
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}
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// shardResult holds the resulting outcome of a shard sent.
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type shardResult struct {
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// preimage is the payment preimage in case of a settled HTLC. Only set
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// if err is non-nil.
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preimage lntypes.Preimage
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// err indicates that the shard failed.
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err error
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}
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// collectResult waits for the result for the given attempt to be available
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// from the Switch, then records the attempt outcome with the control tower. A
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// shardResult is returned, indicating the final outcome of this HTLC attempt.
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func (p *shardHandler) collectResult(attempt *channeldb.HTLCAttemptInfo) (
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*shardResult, error) {
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// Regenerate the circuit for this attempt.
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_, circuit, err := generateSphinxPacket(
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&attempt.Route, p.paymentHash[:],
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attempt.SessionKey,
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)
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if err != nil {
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return nil, err
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}
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// Using the created circuit, initialize the error decrypter so we can
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// parse+decode any failures incurred by this payment within the
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// switch.
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errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
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OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(circuit),
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}
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// Now ask the switch to return the result of the payment when
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// available.
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resultChan, err := p.router.cfg.Payer.GetPaymentResult(
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attempt.AttemptID, p.paymentHash, errorDecryptor,
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)
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switch {
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// If this attempt ID is unknown to the Switch, it means it was never
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// checkpointed and forwarded by the switch before a restart. In this
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// case we can safely send a new payment attempt, and wait for its
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// result to be available.
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case err == htlcswitch.ErrPaymentIDNotFound:
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log.Debugf("Payment ID %v for hash %x not found in "+
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"the Switch, retrying.", attempt.AttemptID,
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p.paymentHash)
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cErr := p.failAttempt(attempt, err)
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if cErr != nil {
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return nil, cErr
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}
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return &shardResult{
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err: err,
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}, nil
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// A critical, unexpected error was encountered.
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case err != nil:
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log.Errorf("Failed getting result for attemptID %d "+
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"from switch: %v", attempt.AttemptID, err)
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return nil, err
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}
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// The switch knows about this payment, we'll wait for a result to be
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// available.
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var (
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result *htlcswitch.PaymentResult
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ok bool
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)
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select {
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case result, ok = <-resultChan:
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if !ok {
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return nil, htlcswitch.ErrSwitchExiting
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}
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case <-p.router.quit:
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return nil, ErrRouterShuttingDown
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}
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// In case of a payment failure, fail the attempt with the control
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// tower and return.
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if result.Error != nil {
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log.Errorf("Attempt to send payment %x failed: %v",
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p.paymentHash, result.Error)
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err := p.failAttempt(attempt, result.Error)
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if err != nil {
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return nil, err
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}
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return &shardResult{
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err: result.Error,
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}, nil
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}
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// We successfully got a payment result back from the switch.
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log.Debugf("Payment %x succeeded with pid=%v",
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p.paymentHash, attempt.AttemptID)
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// Report success to mission control.
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err = p.router.cfg.MissionControl.ReportPaymentSuccess(
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attempt.AttemptID, &attempt.Route,
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)
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if err != nil {
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log.Errorf("Error reporting payment success to mc: %v",
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err)
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}
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// In case of success we atomically store settle result to the DB move
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// the shard to the settled state.
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err = p.router.cfg.Control.SettleAttempt(
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p.paymentHash, attempt.AttemptID,
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&channeldb.HTLCSettleInfo{
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Preimage: result.Preimage,
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SettleTime: p.router.cfg.Clock.Now(),
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},
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)
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if err != nil {
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log.Errorf("Unable to succeed payment attempt: %v", err)
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return nil, err
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}
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return &shardResult{
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preimage: result.Preimage,
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}, nil
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}
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// errorToPaymentFailure takes a path finding error and converts it into a
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// payment-level failure.
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func errorToPaymentFailure(err error) channeldb.FailureReason {
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