lnd.xprv/lnrpc/invoicesrpc/utils.go

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package invoicesrpc
import (
"encoding/hex"
"fmt"
"github.com/btcsuite/btcd/chaincfg"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/zpay32"
)
// CreateRPCInvoice creates an *lnrpc.Invoice from the *channeldb.Invoice.
func CreateRPCInvoice(invoice *channeldb.Invoice,
activeNetParams *chaincfg.Params) (*lnrpc.Invoice, error) {
paymentRequest := string(invoice.PaymentRequest)
decoded, err := zpay32.Decode(paymentRequest, activeNetParams)
if err != nil {
return nil, fmt.Errorf("unable to decode payment request: %v",
err)
}
var descHash []byte
if decoded.DescriptionHash != nil {
descHash = decoded.DescriptionHash[:]
}
fallbackAddr := ""
if decoded.FallbackAddr != nil {
fallbackAddr = decoded.FallbackAddr.String()
}
settleDate := int64(0)
if !invoice.SettleDate.IsZero() {
settleDate = invoice.SettleDate.Unix()
}
// Expiry time will default to 3600 seconds if not specified
// explicitly.
expiry := int64(decoded.Expiry().Seconds())
// The expiry will default to 9 blocks if not specified explicitly.
cltvExpiry := decoded.MinFinalCLTVExpiry()
// Convert between the `lnrpc` and `routing` types.
routeHints := CreateRPCRouteHints(decoded.RouteHints)
preimage := invoice.Terms.PaymentPreimage
satAmt := invoice.Terms.Value.ToSatoshis()
satAmtPaid := invoice.AmtPaid.ToSatoshis()
isSettled := invoice.Terms.State == channeldb.ContractSettled
var state lnrpc.Invoice_InvoiceState
switch invoice.Terms.State {
case channeldb.ContractOpen:
state = lnrpc.Invoice_OPEN
case channeldb.ContractSettled:
state = lnrpc.Invoice_SETTLED
case channeldb.ContractCanceled:
state = lnrpc.Invoice_CANCELED
case channeldb.ContractAccepted:
state = lnrpc.Invoice_ACCEPTED
default:
return nil, fmt.Errorf("unknown invoice state %v",
invoice.Terms.State)
}
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rpcInvoice := &lnrpc.Invoice{
Memo: string(invoice.Memo[:]),
Receipt: invoice.Receipt[:],
RHash: decoded.PaymentHash[:],
Value: int64(satAmt),
CreationDate: invoice.CreationDate.Unix(),
SettleDate: settleDate,
Settled: isSettled,
PaymentRequest: paymentRequest,
DescriptionHash: descHash,
Expiry: expiry,
CltvExpiry: cltvExpiry,
FallbackAddr: fallbackAddr,
RouteHints: routeHints,
AddIndex: invoice.AddIndex,
Private: len(routeHints) > 0,
SettleIndex: invoice.SettleIndex,
AmtPaidSat: int64(satAmtPaid),
AmtPaidMsat: int64(invoice.AmtPaid),
AmtPaid: int64(invoice.AmtPaid),
State: state,
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}
if preimage != channeldb.UnknownPreimage {
rpcInvoice.RPreimage = preimage[:]
}
return rpcInvoice, nil
}
// CreateRPCRouteHints takes in the decoded form of an invoice's route hints
// and converts them into the lnrpc type.
func CreateRPCRouteHints(routeHints [][]zpay32.HopHint) []*lnrpc.RouteHint {
var res []*lnrpc.RouteHint
for _, route := range routeHints {
hopHints := make([]*lnrpc.HopHint, 0, len(route))
for _, hop := range route {
pubKey := hex.EncodeToString(
hop.NodeID.SerializeCompressed(),
)
hint := &lnrpc.HopHint{
NodeId: pubKey,
ChanId: hop.ChannelID,
FeeBaseMsat: hop.FeeBaseMSat,
FeeProportionalMillionths: hop.FeeProportionalMillionths,
CltvExpiryDelta: uint32(hop.CLTVExpiryDelta),
}
hopHints = append(hopHints, hint)
}
routeHint := &lnrpc.RouteHint{HopHints: hopHints}
res = append(res, routeHint)
}
return res
}