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router_server.go
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router_server.go
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package routerrpc
import (
"context"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sync/atomic"
"time"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/wire"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/lightningnetwork/lnd/routing"
"github.com/lightningnetwork/lnd/routing/route"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"gopkg.in/macaroon-bakery.v2/bakery"
)
const (
// subServerName is the name of the sub rpc server. We'll use this name
// to register ourselves, and we also require that the main
// SubServerConfigDispatcher instance recognize as the name of our
subServerName = "RouterRPC"
)
var (
errServerShuttingDown = errors.New("routerrpc server shutting down")
// ErrInterceptorAlreadyExists is an error returned when the a new stream
// is opened and there is already one active interceptor.
// The user must disconnect prior to open another stream.
ErrInterceptorAlreadyExists = errors.New("interceptor already exists")
// macaroonOps are the set of capabilities that our minted macaroon (if
// it doesn't already exist) will have.
macaroonOps = []bakery.Op{
{
Entity: "offchain",
Action: "read",
},
{
Entity: "offchain",
Action: "write",
},
}
// macPermissions maps RPC calls to the permissions they require.
macPermissions = map[string][]bakery.Op{
"/routerrpc.Router/SendPaymentV2": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/SendToRouteV2": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/SendToRoute": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/TrackPaymentV2": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/TrackPayments": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/EstimateRouteFee": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/QueryMissionControl": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/XImportMissionControl": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/GetMissionControlConfig": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/SetMissionControlConfig": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/QueryProbability": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/ResetMissionControl": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/BuildRoute": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/SubscribeHtlcEvents": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/SendPayment": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/TrackPayment": {{
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/HtlcInterceptor": {{
Entity: "offchain",
Action: "write",
}},
"/routerrpc.Router/UpdateChanStatus": {{
Entity: "offchain",
Action: "write",
}},
}
// DefaultRouterMacFilename is the default name of the router macaroon
// that we expect to find via a file handle within the main
// configuration file in this package.
DefaultRouterMacFilename = "router.macaroon"
)
// ServerShell a is shell struct holding a reference to the actual sub-server.
// It is used to register the gRPC sub-server with the root server before we
// have the necessary dependencies to populate the actual sub-server.
type ServerShell struct {
RouterServer
}
// Server is a stand alone sub RPC server which exposes functionality that
// allows clients to route arbitrary payment through the Lightning Network.
type Server struct {
started int32 // To be used atomically.
shutdown int32 // To be used atomically.
forwardInterceptorActive int32 // To be used atomically.
// Required by the grpc-gateway/v2 library for forward compatibility.
// Must be after the atomically used variables to not break struct
// alignment.
UnimplementedRouterServer
cfg *Config
quit chan struct{}
}
// A compile time check to ensure that Server fully implements the RouterServer
// gRPC service.
var _ RouterServer = (*Server)(nil)
// New creates a new instance of the RouterServer given a configuration struct
// that contains all external dependencies. If the target macaroon exists, and
// we're unable to create it, then an error will be returned. We also return
// the set of permissions that we require as a server. At the time of writing
// of this documentation, this is the same macaroon as as the admin macaroon.
func New(cfg *Config) (*Server, lnrpc.MacaroonPerms, error) {
// If the path of the router macaroon wasn't generated, then we'll
// assume that it's found at the default network directory.
if cfg.RouterMacPath == "" {
cfg.RouterMacPath = filepath.Join(
cfg.NetworkDir, DefaultRouterMacFilename,
)
}
// Now that we know the full path of the router macaroon, we can check
// to see if we need to create it or not. If stateless_init is set
// then we don't write the macaroons.
macFilePath := cfg.RouterMacPath
if cfg.MacService != nil && !cfg.MacService.StatelessInit &&
!lnrpc.FileExists(macFilePath) {
log.Infof("Making macaroons for Router RPC Server at: %v",
macFilePath)
// At this point, we know that the router macaroon doesn't yet,
// exist, so we need to create it with the help of the main
// macaroon service.
routerMac, err := cfg.MacService.NewMacaroon(
context.Background(), macaroons.DefaultRootKeyID,
macaroonOps...,
)
if err != nil {
return nil, nil, err
}
routerMacBytes, err := routerMac.M().MarshalBinary()
if err != nil {
return nil, nil, err
}
err = ioutil.WriteFile(macFilePath, routerMacBytes, 0644)
if err != nil {
_ = os.Remove(macFilePath)
return nil, nil, err
}
}
routerServer := &Server{
cfg: cfg,
quit: make(chan struct{}),
}
return routerServer, macPermissions, nil
}
// Start launches any helper goroutines required for the rpcServer to function.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Start() error {
if atomic.AddInt32(&s.started, 1) != 1 {
return nil
}
return nil
}
// Stop signals any active goroutines for a graceful closure.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Stop() error {
if atomic.AddInt32(&s.shutdown, 1) != 1 {
return nil
}
close(s.quit)
return nil
}
// Name returns a unique string representation of the sub-server. This can be
// used to identify the sub-server and also de-duplicate them.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Name() string {
return subServerName
}
// RegisterWithRootServer will be called by the root gRPC server to direct a
// sub RPC server to register itself with the main gRPC root server. Until this
// is called, each sub-server won't be able to have requests routed towards it.
//
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) RegisterWithRootServer(grpcServer *grpc.Server) error {
// We make sure that we register it with the main gRPC server to ensure
// all our methods are routed properly.
RegisterRouterServer(grpcServer, r)
log.Debugf("Router RPC server successfully register with root gRPC " +
"server")
return nil
}
// RegisterWithRestServer will be called by the root REST mux to direct a sub
// RPC server to register itself with the main REST mux server. Until this is
// called, each sub-server won't be able to have requests routed towards it.
//
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) RegisterWithRestServer(ctx context.Context,
mux *runtime.ServeMux, dest string, opts []grpc.DialOption) error {
// We make sure that we register it with the main REST server to ensure
// all our methods are routed properly.
err := RegisterRouterHandlerFromEndpoint(ctx, mux, dest, opts)
if err != nil {
log.Errorf("Could not register Router REST server "+
"with root REST server: %v", err)
return err
}
log.Debugf("Router REST server successfully registered with " +
"root REST server")
return nil
}
// CreateSubServer populates the subserver's dependencies using the passed
// SubServerConfigDispatcher. This method should fully initialize the
// sub-server instance, making it ready for action. It returns the macaroon
// permissions that the sub-server wishes to pass on to the root server for all
// methods routed towards it.
//
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) CreateSubServer(configRegistry lnrpc.SubServerConfigDispatcher) (
lnrpc.SubServer, lnrpc.MacaroonPerms, error) {
subServer, macPermissions, err := createNewSubServer(configRegistry)
if err != nil {
return nil, nil, err
}
r.RouterServer = subServer
return subServer, macPermissions, nil
}
// SendPaymentV2 attempts to route a payment described by the passed
// PaymentRequest to the final destination. If we are unable to route the
// payment, or cannot find a route that satisfies the constraints in the
// PaymentRequest, then an error will be returned. Otherwise, the payment
// pre-image, along with the final route will be returned.
func (s *Server) SendPaymentV2(req *SendPaymentRequest,
stream Router_SendPaymentV2Server) error {
payment, err := s.cfg.RouterBackend.extractIntentFromSendRequest(req)
if err != nil {
return err
}
// Get the payment hash.
payHash := payment.Identifier()
// Init the payment in db.
paySession, shardTracker, err := s.cfg.Router.PreparePayment(payment)
if err != nil {
return err
}
// Subscribe to the payment before sending it to make sure we won't
// miss events.
sub, err := s.subscribePayment(payHash)
if err != nil {
return err
}
// Send the payment.
err = s.cfg.Router.SendPaymentAsync(payment, paySession, shardTracker)
if err == nil {
// If the payment was sent successfully, we can start tracking
// the events.
return s.trackPayment(
sub, payHash, stream, req.NoInflightUpdates,
)
}
// Otherwise, transform user errors to grpc code.
if errors.Is(err, channeldb.ErrPaymentInFlight) ||
errors.Is(err, channeldb.ErrAlreadyPaid) {
log.Debugf("SendPayment async result for payment %x: %v",
payment.Identifier(), err)
return status.Error(codes.AlreadyExists, err.Error())
}
log.Errorf("SendPayment async error for payment %x: %v",
payment.Identifier(), err)
return err
}
// EstimateRouteFee allows callers to obtain a lower bound w.r.t how much it
// may cost to send an HTLC to the target end destination.
func (s *Server) EstimateRouteFee(ctx context.Context,
req *RouteFeeRequest) (*RouteFeeResponse, error) {
if len(req.Dest) != 33 {
return nil, errors.New("invalid length destination key")
}
var destNode route.Vertex
copy(destNode[:], req.Dest)
// Next, we'll convert the amount in satoshis to mSAT, which are the
// native unit of LN.
amtMsat := lnwire.NewMSatFromSatoshis(btcutil.Amount(req.AmtSat))
// Pick a fee limit
//
// TODO: Change this into behaviour that makes more sense.
feeLimit := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// Finally, we'll query for a route to the destination that can carry
// that target amount, we'll only request a single route. Set a
// restriction for the default CLTV limit, otherwise we can find a route
// that exceeds it and is useless to us.
mc := s.cfg.RouterBackend.MissionControl
route, _, err := s.cfg.Router.FindRoute(
s.cfg.RouterBackend.SelfNode, destNode, amtMsat, 0,
&routing.RestrictParams{
FeeLimit: feeLimit,
CltvLimit: s.cfg.RouterBackend.MaxTotalTimelock,
ProbabilitySource: mc.GetProbability,
}, nil, nil, s.cfg.RouterBackend.DefaultFinalCltvDelta,
)
if err != nil {
return nil, err
}
return &RouteFeeResponse{
RoutingFeeMsat: int64(route.TotalFees()),
TimeLockDelay: int64(route.TotalTimeLock),
}, nil
}
// SendToRouteV2 sends a payment through a predefined route. The response of this
// call contains structured error information.
func (s *Server) SendToRouteV2(ctx context.Context,
req *SendToRouteRequest) (*lnrpc.HTLCAttempt, error) {
if req.Route == nil {
return nil, fmt.Errorf("unable to send, no routes provided")
}
route, err := s.cfg.RouterBackend.UnmarshallRoute(req.Route)
if err != nil {
return nil, err
}
hash, err := lntypes.MakeHash(req.PaymentHash)
if err != nil {
return nil, err
}
var attempt *channeldb.HTLCAttempt
// Pass route to the router. This call returns the full htlc attempt
// information as it is stored in the database. It is possible that both
// the attempt return value and err are non-nil. This can happen when
// the attempt was already initiated before the error happened. In that
// case, we give precedence to the attempt information as stored in the
// db.
if req.SkipTempErr {
attempt, err = s.cfg.Router.SendToRouteSkipTempErr(hash, route)
} else {
attempt, err = s.cfg.Router.SendToRoute(hash, route)
}
if attempt != nil {
rpcAttempt, err := s.cfg.RouterBackend.MarshalHTLCAttempt(
*attempt,
)
if err != nil {
return nil, err
}
return rpcAttempt, nil
}
// Transform user errors to grpc code.
if err == channeldb.ErrPaymentInFlight ||
err == channeldb.ErrAlreadyPaid {
return nil, status.Error(codes.AlreadyExists, err.Error())
}
return nil, err
}
// ResetMissionControl clears all mission control state and starts with a clean
// slate.
func (s *Server) ResetMissionControl(ctx context.Context,
req *ResetMissionControlRequest) (*ResetMissionControlResponse, error) {
err := s.cfg.RouterBackend.MissionControl.ResetHistory()
if err != nil {
return nil, err
}
return &ResetMissionControlResponse{}, nil
}
// GetMissionControlConfig returns our current mission control config.
func (s *Server) GetMissionControlConfig(ctx context.Context,
req *GetMissionControlConfigRequest) (*GetMissionControlConfigResponse,
error) {
// Query the current mission control config.
cfg := s.cfg.RouterBackend.MissionControl.GetConfig()
resp := &GetMissionControlConfigResponse{
Config: &MissionControlConfig{
MaximumPaymentResults: uint32(cfg.MaxMcHistory),
MinimumFailureRelaxInterval: uint64(
cfg.MinFailureRelaxInterval.Seconds(),
),
},
}
// We only populate fields based on the current estimator.
switch v := cfg.Estimator.Config().(type) {
case routing.AprioriConfig:
resp.Config.Model = MissionControlConfig_APRIORI
aCfg := AprioriParameters{
HalfLifeSeconds: uint64(v.PenaltyHalfLife.Seconds()),
HopProbability: v.AprioriHopProbability,
Weight: v.AprioriWeight,
CapacityFraction: v.CapacityFraction,
}
// Populate deprecated fields.
resp.Config.HalfLifeSeconds = uint64(
v.PenaltyHalfLife.Seconds(),
)
resp.Config.HopProbability = float32(v.AprioriHopProbability)
resp.Config.Weight = float32(v.AprioriWeight)
resp.Config.EstimatorConfig = &MissionControlConfig_Apriori{
Apriori: &aCfg,
}
case routing.BimodalConfig:
resp.Config.Model = MissionControlConfig_BIMODAL
bCfg := BimodalParameters{
NodeWeight: v.BimodalNodeWeight,
ScaleMsat: uint64(v.BimodalScaleMsat),
DecayTime: uint64(v.BimodalDecayTime.Seconds()),
}
resp.Config.EstimatorConfig = &MissionControlConfig_Bimodal{
Bimodal: &bCfg,
}
default:
return nil, fmt.Errorf("unknown estimator config type %T", v)
}
return resp, nil
}
// SetMissionControlConfig sets parameters in the mission control config.
func (s *Server) SetMissionControlConfig(ctx context.Context,
req *SetMissionControlConfigRequest) (*SetMissionControlConfigResponse,
error) {
mcCfg := &routing.MissionControlConfig{
MaxMcHistory: int(req.Config.MaximumPaymentResults),
MinFailureRelaxInterval: time.Duration(
req.Config.MinimumFailureRelaxInterval,
) * time.Second,
}
switch req.Config.Model {
case MissionControlConfig_APRIORI:
var aprioriConfig routing.AprioriConfig
// Determine the apriori config with backward compatibility
// should the api use deprecated fields.
switch v := req.Config.EstimatorConfig.(type) {
case *MissionControlConfig_Bimodal:
return nil, fmt.Errorf("bimodal config " +
"provided, but apriori model requested")
case *MissionControlConfig_Apriori:
aprioriConfig = routing.AprioriConfig{
PenaltyHalfLife: time.Duration(
v.Apriori.HalfLifeSeconds,
) * time.Second,
AprioriHopProbability: v.Apriori.HopProbability,
AprioriWeight: v.Apriori.Weight,
CapacityFraction: v.Apriori.
CapacityFraction,
}
default:
aprioriConfig = routing.AprioriConfig{
PenaltyHalfLife: time.Duration(
int64(req.Config.HalfLifeSeconds),
) * time.Second,
AprioriHopProbability: float64(
req.Config.HopProbability,
),
AprioriWeight: float64(req.Config.Weight),
CapacityFraction: float64(
routing.DefaultCapacityFraction),
}
}
estimator, err := routing.NewAprioriEstimator(aprioriConfig)
if err != nil {
return nil, err
}
mcCfg.Estimator = estimator
case MissionControlConfig_BIMODAL:
cfg, ok := req.Config.
EstimatorConfig.(*MissionControlConfig_Bimodal)
if !ok {
return nil, fmt.Errorf("bimodal estimator requested " +
"but corresponding config not set")
}
bCfg := cfg.Bimodal
bimodalConfig := routing.BimodalConfig{
BimodalDecayTime: time.Duration(
bCfg.DecayTime,
) * time.Second,
BimodalScaleMsat: lnwire.MilliSatoshi(bCfg.ScaleMsat),
BimodalNodeWeight: bCfg.NodeWeight,
}
estimator, err := routing.NewBimodalEstimator(bimodalConfig)
if err != nil {
return nil, err
}
mcCfg.Estimator = estimator
default:
return nil, fmt.Errorf("unknown estimator type %v",
req.Config.Model)
}
return &SetMissionControlConfigResponse{},
s.cfg.RouterBackend.MissionControl.SetConfig(mcCfg)
}
// QueryMissionControl exposes the internal mission control state to callers. It
// is a development feature.
func (s *Server) QueryMissionControl(ctx context.Context,
req *QueryMissionControlRequest) (*QueryMissionControlResponse, error) {
snapshot := s.cfg.RouterBackend.MissionControl.GetHistorySnapshot()
rpcPairs := make([]*PairHistory, 0, len(snapshot.Pairs))
for _, p := range snapshot.Pairs {
// Prevent binding to loop variable.
pair := p
rpcPair := PairHistory{
NodeFrom: pair.Pair.From[:],
NodeTo: pair.Pair.To[:],
History: toRPCPairData(&pair.TimedPairResult),
}
rpcPairs = append(rpcPairs, &rpcPair)
}
response := QueryMissionControlResponse{
Pairs: rpcPairs,
}
return &response, nil
}
// toRPCPairData marshalls mission control pair data to the rpc struct.
func toRPCPairData(data *routing.TimedPairResult) *PairData {
rpcData := PairData{
FailAmtSat: int64(data.FailAmt.ToSatoshis()),
FailAmtMsat: int64(data.FailAmt),
SuccessAmtSat: int64(data.SuccessAmt.ToSatoshis()),
SuccessAmtMsat: int64(data.SuccessAmt),
}
if !data.FailTime.IsZero() {
rpcData.FailTime = data.FailTime.Unix()
}
if !data.SuccessTime.IsZero() {
rpcData.SuccessTime = data.SuccessTime.Unix()
}
return &rpcData
}
// XImportMissionControl imports the state provided to our internal mission
// control. Only entries that are fresher than our existing state will be used.
func (s *Server) XImportMissionControl(ctx context.Context,
req *XImportMissionControlRequest) (*XImportMissionControlResponse,
error) {
if len(req.Pairs) == 0 {
return nil, errors.New("at least one pair required for import")
}
snapshot := &routing.MissionControlSnapshot{
Pairs: make(
[]routing.MissionControlPairSnapshot, len(req.Pairs),
),
}
for i, pairResult := range req.Pairs {
pairSnapshot, err := toPairSnapshot(pairResult)
if err != nil {
return nil, err
}
snapshot.Pairs[i] = *pairSnapshot
}
err := s.cfg.RouterBackend.MissionControl.ImportHistory(
snapshot, req.Force,
)
if err != nil {
return nil, err
}
return &XImportMissionControlResponse{}, nil
}
func toPairSnapshot(pairResult *PairHistory) (*routing.MissionControlPairSnapshot,
error) {
from, err := route.NewVertexFromBytes(pairResult.NodeFrom)
if err != nil {
return nil, err
}
to, err := route.NewVertexFromBytes(pairResult.NodeTo)
if err != nil {
return nil, err
}
pairPrefix := fmt.Sprintf("pair: %v -> %v:", from, to)
if from == to {
return nil, fmt.Errorf("%v source and destination node must "+
"differ", pairPrefix)
}
failAmt, failTime, err := getPair(
lnwire.MilliSatoshi(pairResult.History.FailAmtMsat),
btcutil.Amount(pairResult.History.FailAmtSat),
pairResult.History.FailTime,
)
if err != nil {
return nil, fmt.Errorf("%v invalid failure: %v", pairPrefix,
err)
}
successAmt, successTime, err := getPair(
lnwire.MilliSatoshi(pairResult.History.SuccessAmtMsat),
btcutil.Amount(pairResult.History.SuccessAmtSat),
pairResult.History.SuccessTime,
)
if err != nil {
return nil, fmt.Errorf("%v invalid success: %v", pairPrefix,
err)
}
if successAmt == 0 && failAmt == 0 {
return nil, fmt.Errorf("%v: either success or failure result "+
"required", pairPrefix)
}
pair := routing.NewDirectedNodePair(from, to)
result := &routing.TimedPairResult{
FailAmt: failAmt,
FailTime: failTime,
SuccessAmt: successAmt,
SuccessTime: successTime,
}
return &routing.MissionControlPairSnapshot{
Pair: pair,
TimedPairResult: *result,
}, nil
}
// getPair validates the values provided for a mission control result and
// returns the msat amount and timestamp for it.
func getPair(amtMsat lnwire.MilliSatoshi, amtSat btcutil.Amount,
timestamp int64) (lnwire.MilliSatoshi, time.Time, error) {
amt, err := getMsatPairValue(amtMsat, amtSat)
if err != nil {
return 0, time.Time{}, err
}
var (
timeSet = timestamp != 0
amountSet = amt != 0
)
switch {
case timeSet && amountSet:
return amt, time.Unix(timestamp, 0), nil
case timeSet && !amountSet:
return 0, time.Time{}, errors.New("non-zero timestamp " +
"requires non-zero amount")
case !timeSet && amountSet:
return 0, time.Time{}, errors.New("non-zero amount requires " +
"non-zero timestamp")
default:
return 0, time.Time{}, nil
}
}
// getMsatPairValue checks the msat and sat values set for a pair and ensures
// that the values provided are either the same, or only a single value is set.
func getMsatPairValue(msatValue lnwire.MilliSatoshi,
satValue btcutil.Amount) (lnwire.MilliSatoshi, error) {
// If our msat value converted to sats equals our sat value, we just
// return the msat value, since the values are the same.
if msatValue.ToSatoshis() == satValue {
return msatValue, nil
}
// If we have no msatValue, we can just return our state value even if
// it is zero, because it's impossible that we have mismatched values.
if msatValue == 0 {
return lnwire.MilliSatoshi(satValue * 1000), nil
}
// Likewise, we can just use msat value if we have no sat value set.
if satValue == 0 {
return msatValue, nil
}
// If our values are non-zero but not equal, we have invalid amounts
// set, so we fail.
return 0, fmt.Errorf("msat: %v and sat: %v values not equal", msatValue,
satValue)
}
// TrackPaymentV2 returns a stream of payment state updates. The stream is
// closed when the payment completes.
func (s *Server) TrackPaymentV2(request *TrackPaymentRequest,
stream Router_TrackPaymentV2Server) error {
payHash, err := lntypes.MakeHash(request.PaymentHash)
if err != nil {
return err
}
log.Debugf("TrackPayment called for payment %v", payHash)
// Make the subscription.
sub, err := s.subscribePayment(payHash)
if err != nil {
return err
}
return s.trackPayment(sub, payHash, stream, request.NoInflightUpdates)
}
// subscribePayment subscribes to the payment updates for the given payment
// hash.
func (s *Server) subscribePayment(identifier lntypes.Hash) (
routing.ControlTowerSubscriber, error) {
// Make the subscription.
router := s.cfg.RouterBackend
sub, err := router.Tower.SubscribePayment(identifier)
switch {
case err == channeldb.ErrPaymentNotInitiated:
return nil, status.Error(codes.NotFound, err.Error())
case err != nil:
return nil, err
}
return sub, nil
}
// trackPayment writes payment status updates to the provided stream.
func (s *Server) trackPayment(subscription routing.ControlTowerSubscriber,
identifier lntypes.Hash, stream Router_TrackPaymentV2Server,
noInflightUpdates bool) error {
// Stream updates to the client.
err := s.trackPaymentStream(
stream.Context(), subscription, noInflightUpdates, stream.Send,
)
if errors.Is(err, context.Canceled) {
log.Debugf("Payment stream %v canceled", identifier)
}
return err
}
// TrackPayments returns a stream of payment state updates.
func (s *Server) TrackPayments(request *TrackPaymentsRequest,
stream Router_TrackPaymentsServer) error {
log.Debug("TrackPayments called")
router := s.cfg.RouterBackend
// Subscribe to payments.
subscription, err := router.Tower.SubscribeAllPayments()
if err != nil {
return err
}
// Stream updates to the client.
err = s.trackPaymentStream(
stream.Context(), subscription, request.NoInflightUpdates,
stream.Send,
)
if errors.Is(err, context.Canceled) {
log.Debugf("TrackPayments payment stream canceled.")
}
return err
}
// trackPaymentStream streams payment updates to the client.
func (s *Server) trackPaymentStream(context context.Context,
subscription routing.ControlTowerSubscriber, noInflightUpdates bool,
send func(*lnrpc.Payment) error) error {
defer subscription.Close()
// Stream updates back to the client.
for {
select {
case item, ok := <-subscription.Updates():
if !ok {
// No more payment updates.
return nil
}
result := item.(*channeldb.MPPayment)
// Skip in-flight updates unless requested.
if noInflightUpdates &&
result.Status == channeldb.StatusInFlight {
continue
}
rpcPayment, err := s.cfg.RouterBackend.MarshallPayment(
result,
)
if err != nil {
return err
}
// Send event to the client.
err = send(rpcPayment)
if err != nil {
return err
}
case <-s.quit:
return errServerShuttingDown
case <-context.Done():
return context.Err()
}
}
}
// BuildRoute builds a route from a list of hop addresses.
func (s *Server) BuildRoute(ctx context.Context,
req *BuildRouteRequest) (*BuildRouteResponse, error) {
// Unmarshall hop list.
hops := make([]route.Vertex, len(req.HopPubkeys))
for i, pubkeyBytes := range req.HopPubkeys {
pubkey, err := route.NewVertexFromBytes(pubkeyBytes)
if err != nil {
return nil, err
}
hops[i] = pubkey
}
// Prepare BuildRoute call parameters from rpc request.
var amt *lnwire.MilliSatoshi
if req.AmtMsat != 0 {
rpcAmt := lnwire.MilliSatoshi(req.AmtMsat)
amt = &rpcAmt
}
var outgoingChan *uint64
if req.OutgoingChanId != 0 {
outgoingChan = &req.OutgoingChanId
}
var payAddr *[32]byte
if len(req.PaymentAddr) != 0 {
var backingPayAddr [32]byte
copy(backingPayAddr[:], req.PaymentAddr)
payAddr = &backingPayAddr
}
// Build the route and return it to the caller.
route, err := s.cfg.Router.BuildRoute(
amt, hops, outgoingChan, req.FinalCltvDelta, payAddr,
)
if err != nil {
return nil, err
}
rpcRoute, err := s.cfg.RouterBackend.MarshallRoute(route)
if err != nil {
return nil, err
}
routeResp := &BuildRouteResponse{
Route: rpcRoute,
}
return routeResp, nil
}