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239 lines
5.8 KiB
Go
239 lines
5.8 KiB
Go
package lndclient
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import (
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"context"
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"encoding/hex"
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"fmt"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/routing/route"
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"time"
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"github.com/lightningnetwork/lnd/channeldb"
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"google.golang.org/grpc/codes"
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"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
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"github.com/lightningnetwork/lnd/lnwire"
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"google.golang.org/grpc"
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"google.golang.org/grpc/status"
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"github.com/btcsuite/btcutil"
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"github.com/lightningnetwork/lnd/lntypes"
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)
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// RouterClient exposes payment functionality.
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type RouterClient interface {
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// SendPayment attempts to route a payment to the final destination. The
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// call returns a payment update stream and an error stream.
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SendPayment(ctx context.Context, request SendPaymentRequest) (
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chan PaymentStatus, chan error, error)
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// TrackPayment picks up a previously started payment and returns a
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// payment update stream and an error stream.
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TrackPayment(ctx context.Context, hash lntypes.Hash) (
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chan PaymentStatus, chan error, error)
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}
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// PaymentStatus describe the state of a payment.
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type PaymentStatus struct {
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State routerrpc.PaymentState
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Preimage lntypes.Preimage
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Fee lnwire.MilliSatoshi
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Route *route.Route
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}
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// SendPaymentRequest defines the payment parameters for a new payment.
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type SendPaymentRequest struct {
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Invoice string
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MaxFee btcutil.Amount
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MaxCltv *int32
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OutgoingChannel *uint64
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Timeout time.Duration
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}
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// routerClient is a wrapper around the generated routerrpc proxy.
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type routerClient struct {
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client routerrpc.RouterClient
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routerKitMac serializedMacaroon
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}
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func newRouterClient(conn *grpc.ClientConn,
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routerKitMac serializedMacaroon) *routerClient {
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return &routerClient{
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client: routerrpc.NewRouterClient(conn),
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routerKitMac: routerKitMac,
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}
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}
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// SendPayment attempts to route a payment to the final destination. The call
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// returns a payment update stream and an error stream.
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func (r *routerClient) SendPayment(ctx context.Context,
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request SendPaymentRequest) (chan PaymentStatus, chan error, error) {
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rpcCtx := r.routerKitMac.WithMacaroonAuth(ctx)
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rpcReq := &routerrpc.SendPaymentRequest{
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FeeLimitSat: int64(request.MaxFee),
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PaymentRequest: request.Invoice,
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TimeoutSeconds: int32(request.Timeout.Seconds()),
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}
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if request.MaxCltv != nil {
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rpcReq.CltvLimit = *request.MaxCltv
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}
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if request.OutgoingChannel != nil {
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rpcReq.OutgoingChanId = *request.OutgoingChannel
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}
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stream, err := r.client.SendPayment(rpcCtx, rpcReq)
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if err != nil {
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return nil, nil, err
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}
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return r.trackPayment(ctx, stream)
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}
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// TrackPayment picks up a previously started payment and returns a payment
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// update stream and an error stream.
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func (r *routerClient) TrackPayment(ctx context.Context,
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hash lntypes.Hash) (chan PaymentStatus, chan error, error) {
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ctx = r.routerKitMac.WithMacaroonAuth(ctx)
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stream, err := r.client.TrackPayment(
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ctx, &routerrpc.TrackPaymentRequest{
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PaymentHash: hash[:],
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},
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)
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if err != nil {
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return nil, nil, err
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}
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return r.trackPayment(ctx, stream)
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}
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// trackPayment takes an update stream from either a SendPayment or a
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// TrackPayment rpc call and converts it into distinct update and error streams.
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func (r *routerClient) trackPayment(ctx context.Context,
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stream routerrpc.Router_TrackPaymentClient) (chan PaymentStatus,
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chan error, error) {
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statusChan := make(chan PaymentStatus)
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errorChan := make(chan error, 1)
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go func() {
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for {
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rpcStatus, err := stream.Recv()
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if err != nil {
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switch status.Convert(err).Code() {
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// NotFound is only expected as a response to
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// TrackPayment.
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case codes.NotFound:
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err = channeldb.ErrPaymentNotInitiated
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// NotFound is only expected as a response to
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// SendPayment.
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case codes.AlreadyExists:
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err = channeldb.ErrAlreadyPaid
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}
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errorChan <- err
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return
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}
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status, err := unmarshallPaymentStatus(rpcStatus)
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if err != nil {
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errorChan <- err
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return
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}
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select {
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case statusChan <- *status:
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case <-ctx.Done():
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return
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}
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}
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}()
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return statusChan, errorChan, nil
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}
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// unmarshallPaymentStatus converts an rpc status update to the PaymentStatus
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// type that is used throughout the application.
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func unmarshallPaymentStatus(rpcStatus *routerrpc.PaymentStatus) (
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*PaymentStatus, error) {
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status := PaymentStatus{
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State: rpcStatus.State,
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}
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if status.State == routerrpc.PaymentState_SUCCEEDED {
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preimage, err := lntypes.MakePreimage(
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rpcStatus.Preimage,
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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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status.Preimage = preimage
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status.Fee = lnwire.MilliSatoshi(
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rpcStatus.Route.TotalFeesMsat,
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)
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if rpcStatus.Route != nil {
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route, err := unmarshallRoute(rpcStatus.Route)
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if err != nil {
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return nil, err
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}
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status.Route = route
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}
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}
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return &status, nil
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}
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// unmarshallRoute unmarshalls an rpc route.
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func unmarshallRoute(rpcroute *lnrpc.Route) (
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*route.Route, error) {
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hops := make([]*route.Hop, len(rpcroute.Hops))
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for i, hop := range rpcroute.Hops {
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routeHop, err := unmarshallHop(hop)
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if err != nil {
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return nil, err
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}
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hops[i] = routeHop
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}
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// TODO(joostjager): Fetch self node from lnd.
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selfNode := route.Vertex{}
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route, err := route.NewRouteFromHops(
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lnwire.MilliSatoshi(rpcroute.TotalAmtMsat),
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rpcroute.TotalTimeLock,
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selfNode,
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hops,
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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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return route, nil
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}
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// unmarshallKnownPubkeyHop unmarshalls an rpc hop.
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func unmarshallHop(hop *lnrpc.Hop) (*route.Hop, error) {
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pubKey, err := hex.DecodeString(hop.PubKey)
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if err != nil {
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return nil, fmt.Errorf("cannot decode pubkey %s", hop.PubKey)
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}
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var pubKeyBytes [33]byte
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copy(pubKeyBytes[:], pubKey)
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return &route.Hop{
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OutgoingTimeLock: hop.Expiry,
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AmtToForward: lnwire.MilliSatoshi(hop.AmtToForwardMsat),
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PubKeyBytes: pubKeyBytes,
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ChannelID: hop.ChanId,
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}, nil
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}
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