13035292482

Committed 29 Jan 2025 03:59PM UTC coverage: 49.3% (-9.5%) from 58.777%

Build # 13035292482

Build Type

Pull #9456

github

Committed by

mohamedawnallah

Commit Message

docs: update release-notes-0.19.0.md

In this commit, we warn users about the removal
of RPCs `SendToRoute`, `SendToRouteSync`, `SendPayment`,
and `SendPaymentSync` in the next release 0.20.

Pull Request Pull Request #9456: lnrpc+docs: deprecate warning `SendToRoute`, `SendToRouteSync`, `SendPayment`, and `SendPaymentSync` in Release 0.19

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63.05

/invoices/update_invoice.go

package invoices

import (
        "errors"
        "fmt"
        "time"

        "github.com/lightningnetwork/lnd/graph/db/models"
        "github.com/lightningnetwork/lnd/lntypes"
        "github.com/lightningnetwork/lnd/lnwire"
)

// updateHtlcsAmp takes an invoice, and a new HTLC to be added (along with its
// set ID), and updates the internal AMP state of an invoice, and also tallies
// the set of HTLCs to be updated on disk.
func acceptHtlcsAmp(invoice *Invoice, setID SetID,
        circuitKey models.CircuitKey, htlc *InvoiceHTLC,
        updater InvoiceUpdater) error {

        newAmpState, err := getUpdatedInvoiceAmpState(
                invoice, setID, circuitKey, HtlcStateAccepted, htlc.Amt,
        )
        if err != nil {
                return err
        }

        invoice.AMPState[setID] = newAmpState

        // Mark the updates as needing to be written to disk.
        return updater.UpdateAmpState(setID, newAmpState, circuitKey)
}

// cancelHtlcsAmp processes a cancellation of an HTLC that belongs to an AMP
// HTLC set. We'll need to update the meta data in the  main invoice, and also
// apply the new update to the update MAP, since all the HTLCs for a given HTLC
// set need to be written in-line with each other.
func cancelHtlcsAmp(invoice *Invoice, circuitKey models.CircuitKey,
        htlc *InvoiceHTLC, updater InvoiceUpdater) error {

        setID := htlc.AMP.Record.SetID()

        // First, we'll update the state of the entire HTLC set
        // to cancelled.
        newAmpState, err := getUpdatedInvoiceAmpState(
                invoice, setID, circuitKey, HtlcStateCanceled,
                htlc.Amt,
        )
        if err != nil {
                return err
        }

        invoice.AMPState[setID] = newAmpState

        // Mark the updates as needing to be written to disk.
        err = updater.UpdateAmpState(setID, newAmpState, circuitKey)
        if err != nil {
                return err
        }

        // We'll only decrement the total amount paid if the invoice was
        // already in the accepted state.
        if invoice.AmtPaid != 0 {
                return updateInvoiceAmtPaid(
                        invoice, invoice.AmtPaid-htlc.Amt, updater,
                )
        }

        return nil
}

// settleHtlcsAmp processes a new settle operation on an HTLC set for an AMP
// invoice. We'll update some meta data in the main invoice, and also signal
// that this HTLC set needs to be re-written back to disk.
func settleHtlcsAmp(invoice *Invoice, circuitKey models.CircuitKey,
        htlc *InvoiceHTLC, updater InvoiceUpdater) error {

        setID := htlc.AMP.Record.SetID()

        // Next update the main AMP meta-data to indicate that this HTLC set
        // has been fully settled.
        newAmpState, err := getUpdatedInvoiceAmpState(
                invoice, setID, circuitKey, HtlcStateSettled, 0,
        )
        if err != nil {
                return err
        }

        invoice.AMPState[setID] = newAmpState

        // Mark the updates as needing to be written to disk.
        return updater.UpdateAmpState(setID, newAmpState, circuitKey)
}

// UpdateInvoice fetches the invoice, obtains the update descriptor from the
// callback and applies the updates in a single db transaction.
func UpdateInvoice(hash *lntypes.Hash, invoice *Invoice,
        updateTime time.Time, callback InvoiceUpdateCallback,
        updater InvoiceUpdater) (*Invoice, error) {

        // Create deep copy to prevent any accidental modification in the
        // callback.
        invoiceCopy, err := CopyInvoice(invoice)
        if err != nil {
                return nil, err
        }

        // Call the callback and obtain the update descriptor.
        update, err := callback(invoiceCopy)
        if err != nil {
                return invoice, err
        }

        // If there is nothing to update, return early.
        if update == nil {
                return invoice, nil
        }

        switch update.UpdateType {
        case CancelHTLCsUpdate:
                err := cancelHTLCs(invoice, updateTime, update, updater)
                if err != nil {
                        return nil, err
                }

        case AddHTLCsUpdate:
                err := addHTLCs(invoice, hash, updateTime, update, updater)
                if err != nil {
                        return nil, err
                }

        case SettleHodlInvoiceUpdate:
                err := settleHodlInvoice(
                        invoice, hash, updateTime, update.State, updater,
                )
                if err != nil {
                        return nil, err
                }

        case CancelInvoiceUpdate:
                err := cancelInvoice(
                        invoice, hash, updateTime, update.State, updater,
                )
                if err != nil {
                        return nil, err
                }

        default:
                return nil, fmt.Errorf("unknown update type: %s",
                        update.UpdateType)
        }

        if err := updater.Finalize(update.UpdateType); err != nil {
                return nil, err
        }

        return invoice, nil
}

// cancelHTLCs tries to cancel the htlcs in the given InvoiceUpdateDesc.
//
// NOTE: cancelHTLCs updates will only use the `CancelHtlcs` field in the
// InvoiceUpdateDesc.
func cancelHTLCs(invoice *Invoice, updateTime time.Time,
        update *InvoiceUpdateDesc, updater InvoiceUpdater) error {

        for key := range update.CancelHtlcs {
                htlc, exists := invoice.Htlcs[key]

                // Verify that we don't get an action for htlcs that are not
                // present on the invoice.
                if !exists {
                        return fmt.Errorf("cancel of non-existent htlc")
                }

                err := canCancelSingleHtlc(htlc, invoice.State)
                if err != nil {
                        return err
                }

                err = resolveHtlc(
                        key, htlc, HtlcStateCanceled, updateTime,
                        updater,
                )
                if err != nil {
                        return err
                }

                // Tally this into the set of HTLCs that need to be updated on
                // disk, but once again, only if this is an AMP invoice.
                if invoice.IsAMP() {
                        err := cancelHtlcsAmp(invoice, key, htlc, updater)
                        if err != nil {
                                return err
                        }
                }
        }

        return nil
}

// addHTLCs tries to add the htlcs in the given InvoiceUpdateDesc.
//
//nolint:funlen
func addHTLCs(invoice *Invoice, hash *lntypes.Hash, updateTime time.Time,
        update *InvoiceUpdateDesc, updater InvoiceUpdater) error {

        var setID *[32]byte
        invoiceIsAMP := invoice.IsAMP()
        if invoiceIsAMP && update.State != nil {
                setID = update.State.SetID
        }

        for key, htlcUpdate := range update.AddHtlcs {
                if _, exists := invoice.Htlcs[key]; exists {
                        return fmt.Errorf("duplicate add of htlc %v", key)
                }

                // Force caller to supply htlc without custom records in a
                // consistent way.
                if htlcUpdate.CustomRecords == nil {
                        return errors.New("nil custom records map")
                }

                htlc := &InvoiceHTLC{
                        Amt:           htlcUpdate.Amt,
                        MppTotalAmt:   htlcUpdate.MppTotalAmt,
                        Expiry:        htlcUpdate.Expiry,
                        AcceptHeight:  uint32(htlcUpdate.AcceptHeight),
                        AcceptTime:    updateTime,
                        State:         HtlcStateAccepted,
                        CustomRecords: htlcUpdate.CustomRecords,
                }

                if invoiceIsAMP {
                        if htlcUpdate.AMP == nil {
                                return fmt.Errorf("unable to add htlc "+
                                        "without AMP data to AMP invoice(%v)",
                                        invoice.AddIndex)
                        }

                        htlc.AMP = htlcUpdate.AMP.Copy()
                }

                if err := updater.AddHtlc(key, htlc); err != nil {
                        return err
                }

                invoice.Htlcs[key] = htlc

                // Collect the set of new HTLCs so we can write them properly
                // below, but only if this is an AMP invoice.
                if invoiceIsAMP {
                        err := acceptHtlcsAmp(
                                invoice, htlcUpdate.AMP.Record.SetID(), key,
                                htlc, updater,
                        )
                        if err != nil {
                                return err
                        }
                }
        }

        // At this point, the set of accepted HTLCs should be fully
        // populated with added HTLCs or removed of canceled ones. Update
        // invoice state if the update descriptor indicates an invoice state
        // change, which depends on having an accurate view of the accepted
        // HTLCs.
        if update.State != nil {
                newState, err := getUpdatedInvoiceState(
                        invoice, hash, *update.State,
                )
                if err != nil {
                        return err
                }

                // If this isn't an AMP invoice, then we'll go ahead and update
                // the invoice state directly here. For AMP invoices, we instead
                // will keep the top-level invoice open, and update the state of
                // each _htlc set_ instead. However, we'll allow the invoice to
                // transition to the cancelled state regardless.
                if !invoiceIsAMP || *newState == ContractCanceled {
                        err := updater.UpdateInvoiceState(*newState, nil)
                        if err != nil {
                                return err
                        }
                        invoice.State = *newState
                }
        }

        // The set of HTLC pre-images will only be set if we were actually able
        // to reconstruct all the AMP pre-images.
        var settleEligibleAMP bool
        if update.State != nil {
                settleEligibleAMP = len(update.State.HTLCPreimages) != 0
        }

        // With any invoice level state transitions recorded, we'll now
        // finalize the process by updating the state transitions for
        // individual HTLCs
        var amtPaid lnwire.MilliSatoshi

        for key, htlc := range invoice.Htlcs {
                // Set the HTLC preimage for any AMP HTLCs.
                if setID != nil && update.State != nil {
                        preimage, ok := update.State.HTLCPreimages[key]
                        switch {
                        // If we don't already have a preimage for this HTLC, we
                        // can set it now.
                        case ok && htlc.AMP.Preimage == nil:
                                err := updater.AddAmpHtlcPreimage(
                                        htlc.AMP.Record.SetID(), key, preimage,
                                )
                                if err != nil {
                                        return err
                                }
                                htlc.AMP.Preimage = &preimage

                        // Otherwise, prevent over-writing an existing
                        // preimage.  Ignore the case where the preimage is
                        // identical.
                        case ok && *htlc.AMP.Preimage != preimage:
                                return ErrHTLCPreimageAlreadyExists
                        }
                }

                // The invoice state may have changed and this could have
                // implications for the states of the individual htlcs. Align
                // the htlc state with the current invoice state.
                //
                // If we have all the pre-images for an AMP invoice, then we'll
                // act as if we're able to settle the entire invoice. We need
                // to do this since it's possible for us to settle AMP invoices
                // while the contract state (on disk) is still in the accept
                // state.
                htlcContextState := invoice.State
                if settleEligibleAMP {
                        htlcContextState = ContractSettled
                }
                htlcStateChanged, htlcState, err := getUpdatedHtlcState(
                        htlc, htlcContextState, setID,
                )
                if err != nil {
                        return err
                }

                if htlcStateChanged {
                        err = resolveHtlc(
                                key, htlc, htlcState, updateTime, updater,
                        )
                        if err != nil {
                                return err
                        }
                }

                htlcSettled := htlcStateChanged &&
                        htlcState == HtlcStateSettled

                // If the HTLC has being settled for the first time, and this
                // is an AMP invoice, then we'll need to update some additional
                // meta data state.
                if htlcSettled && invoiceIsAMP {
                        err = settleHtlcsAmp(invoice, key, htlc, updater)
                        if err != nil {
                                return err
                        }
                }

                accepted := htlc.State == HtlcStateAccepted
                settled := htlc.State == HtlcStateSettled
                invoiceStateReady := accepted || settled

                if !invoiceIsAMP {
                        // Update the running amount paid to this invoice. We
                        // don't include accepted htlcs when the invoice is
                        // still open.
                        if invoice.State != ContractOpen &&
                                invoiceStateReady {

                                amtPaid += htlc.Amt
                        }
                } else {
                        // For AMP invoices, since we won't always be reading
                        // out the total invoice set each time, we'll instead
                        // accumulate newly added invoices to the total amount
                        // paid.
                        if _, ok := update.AddHtlcs[key]; !ok {
                                continue
                        }

                        // Update the running amount paid to this invoice. AMP
                        // invoices never go to the settled state, so if it's
                        // open, then we tally the HTLC.
                        if invoice.State == ContractOpen &&
                                invoiceStateReady {

                                amtPaid += htlc.Amt
                        }
                }
        }

        // For non-AMP invoices we recalculate the amount paid from scratch
        // each time, while for AMP invoices, we'll accumulate only based on
        // newly added HTLCs.
        if invoiceIsAMP {
                amtPaid += invoice.AmtPaid
        }

        return updateInvoiceAmtPaid(invoice, amtPaid, updater)
}

func resolveHtlc(circuitKey models.CircuitKey, htlc *InvoiceHTLC,
        state HtlcState, resolveTime time.Time,
        updater InvoiceUpdater) error {

        err := updater.ResolveHtlc(circuitKey, state, resolveTime)
        if err != nil {
                return err
        }
        htlc.State = state
        htlc.ResolveTime = resolveTime

        return nil
}

func updateInvoiceAmtPaid(invoice *Invoice, amt lnwire.MilliSatoshi,
        updater InvoiceUpdater) error {

        err := updater.UpdateInvoiceAmtPaid(amt)
        if err != nil {
                return err
        }
        invoice.AmtPaid = amt

        return nil
}

// settleHodlInvoice marks a hodl invoice as settled.
//
// NOTE: Currently it is not possible to have HODL AMP invoices.
func settleHodlInvoice(invoice *Invoice, hash *lntypes.Hash,
        updateTime time.Time, update *InvoiceStateUpdateDesc,
        updater InvoiceUpdater) error {

        if !invoice.HodlInvoice {
                return fmt.Errorf("unable to settle hodl invoice: %v is "+
                        "not a hodl invoice", invoice.AddIndex)
        }

        // TODO(positiveblue): because NewState can only be ContractSettled we
        // can remove it from the API and set it here directly.
        switch {
        case update == nil:
                fallthrough

        case update.NewState != ContractSettled:
                return fmt.Errorf("unable to settle hodl invoice: "+
                        "not valid InvoiceUpdateDesc.State: %v", update)

        case update.Preimage == nil:
                return fmt.Errorf("unable to settle hodl invoice: " +
                        "preimage is nil")
        }

        newState, err := getUpdatedInvoiceState(
                invoice, hash, *update,
        )
        if err != nil {
                return err
        }

        if newState == nil || *newState != ContractSettled {
                return fmt.Errorf("unable to settle hodl invoice: "+
                        "new computed state is not settled: %s", newState)
        }

        err = updater.UpdateInvoiceState(
                ContractSettled, update.Preimage,
        )
        if err != nil {
                return err
        }

        invoice.State = ContractSettled
        invoice.Terms.PaymentPreimage = update.Preimage

        // TODO(positiveblue): this logic can be further simplified.
        var amtPaid lnwire.MilliSatoshi
        for key, htlc := range invoice.Htlcs {
                settled, _, err := getUpdatedHtlcState(
                        htlc, ContractSettled, nil,
                )
                if err != nil {
                        return err
                }

                if settled {
                        err = resolveHtlc(
                                key, htlc, HtlcStateSettled, updateTime,
                                updater,
                        )
                        if err != nil {
                                return err
                        }

                        amtPaid += htlc.Amt
                }
        }

        return updateInvoiceAmtPaid(invoice, amtPaid, updater)
}

// cancelInvoice attempts to cancel the given invoice. That includes changing
// the invoice state and the state of any relevant HTLC.
func cancelInvoice(invoice *Invoice, hash *lntypes.Hash,
        updateTime time.Time, update *InvoiceStateUpdateDesc,
        updater InvoiceUpdater) error {

        switch {
        case update == nil:
                fallthrough

        case update.NewState != ContractCanceled:
                return fmt.Errorf("unable to cancel invoice: "+
                        "InvoiceUpdateDesc.State not valid: %v", update)
        }

        var (
                setID        *[32]byte
                invoiceIsAMP bool
        )

        invoiceIsAMP = invoice.IsAMP()
        if invoiceIsAMP {
                setID = update.SetID
        }

        newState, err := getUpdatedInvoiceState(invoice, hash, *update)
        if err != nil {
                return err
        }

        if newState == nil || *newState != ContractCanceled {
                return fmt.Errorf("unable to cancel invoice(%v): new "+
                        "computed state is not canceled: %s", invoice.AddIndex,
                        newState)
        }

        err = updater.UpdateInvoiceState(ContractCanceled, nil)
        if err != nil {
                return err
        }
        invoice.State = ContractCanceled

        for key, htlc := range invoice.Htlcs {
                canceled, _, err := getUpdatedHtlcState(
                        htlc, ContractCanceled, setID,
                )
                if err != nil {
                        return err
                }

                if canceled {
                        err = resolveHtlc(
                                key, htlc, HtlcStateCanceled, updateTime,
                                updater,
                        )
                        if err != nil {
                                return err
                        }
                }
        }

        return nil
}

// getUpdatedInvoiceState validates and processes an invoice state update. The
// new state to transition to is returned, so the caller is able to select
// exactly how the invoice state is updated. Note that for AMP invoices this
// function is only used to validate the state transition if we're cancelling
// the invoice.
func getUpdatedInvoiceState(invoice *Invoice, hash *lntypes.Hash,
        update InvoiceStateUpdateDesc) (*ContractState, error) {

        // Returning to open is never allowed from any state.
        if update.NewState == ContractOpen {
                return nil, ErrInvoiceCannotOpen
        }

        switch invoice.State {
        // Once a contract is accepted, we can only transition to settled or
        // canceled. Forbid transitioning back into this state. Otherwise this
        // state is identical to ContractOpen, so we fallthrough to apply the
        // same checks that we apply to open invoices.
        case ContractAccepted:
                if update.NewState == ContractAccepted {
                        return nil, ErrInvoiceCannotAccept
                }

                fallthrough

        // If a contract is open, permit a state transition to accepted, settled
        // or canceled. The only restriction is on transitioning to settled
        // where we ensure the preimage is valid.
        case ContractOpen:
                if update.NewState == ContractCanceled {
                        return &update.NewState, nil
                }

                // Sanity check that the user isn't trying to settle or accept a
                // non-existent HTLC set.
                set := invoice.HTLCSet(update.SetID, HtlcStateAccepted)
                if len(set) == 0 {
                        return nil, ErrEmptyHTLCSet
                }

                // For AMP invoices, there are no invoice-level preimage checks.
                // However, we still sanity check that we aren't trying to
                // settle an AMP invoice with a preimage.
                if update.SetID != nil {
                        if update.Preimage != nil {
                                return nil, errors.New("AMP set cannot have " +
                                        "preimage")
                        }

                        return &update.NewState, nil
                }

                switch {
                // If an invoice-level preimage was supplied, but the InvoiceRef
                // doesn't specify a hash (e.g. AMP invoices) we fail.
                case update.Preimage != nil && hash == nil:
                        return nil, ErrUnexpectedInvoicePreimage

                // Validate the supplied preimage for non-AMP invoices.
                case update.Preimage != nil:
                        if update.Preimage.Hash() != *hash {
                                return nil, ErrInvoicePreimageMismatch
                        }

                // Permit non-AMP invoices to be accepted without knowing the
                // preimage. When trying to settle we'll have to pass through
                // the above check in order to not hit the one below.
                case update.NewState == ContractAccepted:

                // Fail if we still don't have a preimage when transitioning to
                // settle the non-AMP invoice.
                case update.NewState == ContractSettled &&
                        invoice.Terms.PaymentPreimage == nil:

                        return nil, errors.New("unknown preimage")
                }

                return &update.NewState, nil

        // Once settled, we are in a terminal state.
        case ContractSettled:
                return nil, ErrInvoiceAlreadySettled

        // Once canceled, we are in a terminal state.
        case ContractCanceled:
                return nil, ErrInvoiceAlreadyCanceled

        default:
                return nil, errors.New("unknown state transition")
        }
}

// getUpdatedInvoiceAmpState returns the AMP state of an invoice (without
// applying it), given the new state, and the amount of the HTLC that is
// being updated.
func getUpdatedInvoiceAmpState(invoice *Invoice, setID SetID,
        circuitKey models.CircuitKey, state HtlcState,
        amt lnwire.MilliSatoshi) (InvoiceStateAMP, error) {

        // Retrieve the AMP state for this set ID.
        ampState, ok := invoice.AMPState[setID]

        // If the state is accepted then we may need to create a new entry for
        // this set ID, otherwise we expect that the entry already exists and
        // we can update it.
        if !ok && state != HtlcStateAccepted {
                return InvoiceStateAMP{},
                        fmt.Errorf("unable to update AMP state for setID=%x ",
                                setID)
        }

        switch state {
        case HtlcStateAccepted:
                if !ok {
                        // If an entry for this set ID doesn't already exist,
                        // then we'll need to create it.
                        ampState = InvoiceStateAMP{
                                State: HtlcStateAccepted,
                                InvoiceKeys: make(
                                        map[models.CircuitKey]struct{},
                                ),
                        }
                }

                ampState.AmtPaid += amt

        case HtlcStateCanceled:
                ampState.State = HtlcStateCanceled
                ampState.AmtPaid -= amt

        case HtlcStateSettled:
                ampState.State = HtlcStateSettled
        }

        ampState.InvoiceKeys[circuitKey] = struct{}{}

        return ampState, nil
}

// canCancelSingleHtlc validates cancellation of a single HTLC. If nil is
// returned, then the HTLC can be cancelled.
func canCancelSingleHtlc(htlc *InvoiceHTLC,
        invoiceState ContractState) error {

        // It is only possible to cancel individual htlcs on an open invoice.
        if invoiceState != ContractOpen {
                return fmt.Errorf("htlc canceled on invoice in state %v",
                        invoiceState)
        }

        // It is only possible if the htlc is still pending.
        if htlc.State != HtlcStateAccepted {
                return fmt.Errorf("htlc canceled in state %v", htlc.State)
        }

        return nil
}

// getUpdatedHtlcState aligns the state of an htlc with the given invoice state.
// A boolean indicating whether the HTLCs state need to be updated, along with
// the new state (or old state if no change is needed) is returned.
func getUpdatedHtlcState(htlc *InvoiceHTLC,
        invoiceState ContractState, setID *[32]byte) (
        bool, HtlcState, error) {

        trySettle := func(persist bool) (bool, HtlcState, error) {
                if htlc.State != HtlcStateAccepted {
                        return false, htlc.State, nil
                }

                // Settle the HTLC if it matches the settled set id. If
                // there're other HTLCs with distinct setIDs, then we'll leave
                // them, as they may eventually be settled as we permit
                // multiple settles to a single pay_addr for AMP.
                settled := false
                if htlc.IsInHTLCSet(setID) {
                        // Non-AMP HTLCs can be settled immediately since we
                        // already know the preimage is valid due to checks at
                        // the invoice level. For AMP HTLCs, verify that the
                        // per-HTLC preimage-hash pair is valid.
                        switch {
                        // Non-AMP HTLCs can be settle immediately since we
                        // already know the preimage is valid due to checks at
                        // the invoice level.
                        case setID == nil:

                        // At this point, the setID is non-nil, meaning this is
                        // an AMP HTLC. We know that htlc.AMP cannot be nil,
                        // otherwise IsInHTLCSet would have returned false.
                        //
                        // Fail if an accepted AMP HTLC has no preimage.
                        case htlc.AMP.Preimage == nil:
                                return false, htlc.State,
                                        ErrHTLCPreimageMissing

                        // Fail if the accepted AMP HTLC has an invalid
                        // preimage.
                        case !htlc.AMP.Preimage.Matches(htlc.AMP.Hash):
                                return false, htlc.State,
                                        ErrHTLCPreimageMismatch
                        }

                        settled = true
                }

                // Only persist the changes if the invoice is moving to the
                // settled state, and we're actually updating the state to
                // settled.
                newState := htlc.State
                if settled {
                        newState = HtlcStateSettled
                }

                return persist && settled, newState, nil
        }

        if invoiceState == ContractSettled {
                // Check that we can settle the HTLCs. For legacy and MPP HTLCs
                // this will be a NOP, but for AMP HTLCs this asserts that we
                // have a valid hash/preimage pair. Passing true permits the
                // method to update the HTLC to HtlcStateSettled.
                return trySettle(true)
        }

        // We should never find a settled HTLC on an invoice that isn't in
        // ContractSettled.
        if htlc.State == HtlcStateSettled {
                return false, htlc.State, ErrHTLCAlreadySettled
        }

        switch invoiceState {
        case ContractCanceled:
                htlcAlreadyCanceled := htlc.State == HtlcStateCanceled
                return !htlcAlreadyCanceled, HtlcStateCanceled, nil

        // TODO(roasbeef): never fully passed thru now?
        case ContractAccepted:
                // Check that we can settle the HTLCs. For legacy and MPP HTLCs
                // this will be a NOP, but for AMP HTLCs this asserts that we
                // have a valid hash/preimage pair. Passing false prevents the
                // method from putting the HTLC in HtlcStateSettled, leaving it
                // in HtlcStateAccepted.
                return trySettle(false)

        case ContractOpen:
                return false, htlc.State, nil

        default:
                return false, htlc.State, errors.New("unknown state transition")
        }
}

lightningnetwork / lnd / 13035292482

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