use LndClient

server.go

@@ -3,14 +3,12 @@ package main
 import (
 	"context"
 	"crypto/tls"
-	"crypto/x509"
 	"encoding/hex"
 	"fmt"
 	"log"
 	"net"
 	"os"
 	"strconv"
-	"strings"
 
 	"github.com/breez/lspd/btceclegacy"
 	lspdrpc "github.com/breez/lspd/rpc"
@@ -18,16 +16,13 @@ import (
 
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
+	"github.com/btcsuite/btcd/wire"
 	"github.com/caddyserver/certmagic"
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
-	"github.com/lightningnetwork/lnd/lnrpc"
-	"github.com/lightningnetwork/lnd/lnrpc/chainrpc"
-	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"golang.org/x/sync/singleflight"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 )
@@ -48,9 +43,7 @@ const (
 type server struct{}
 
 var (
-	client              lnrpc.LightningClient
-	routerClient        routerrpc.RouterClient
-	chainNotifierClient chainrpc.ChainNotifierClient
+	client              *LndClient
 	openChannelReqGroup singleflight.Group
 	privateKey          *btcec.PrivateKey
 	publicKey           *btcec.PublicKey
@@ -105,12 +98,12 @@ func (s *server) RegisterPayment(ctx context.Context, in *lspdrpc.RegisterPaymen
 
 func (s *server) OpenChannel(ctx context.Context, in *lspdrpc.OpenChannelRequest) (*lspdrpc.OpenChannelReply, error) {
 	r, err, _ := openChannelReqGroup.Do(in.Pubkey, func() (interface{}, error) {
-		clientCtx := metadata.AppendToOutgoingContext(context.Background(), "macaroon", os.Getenv("LND_MACAROON_HEX"))
-		nodeChannels, err := getNodeChannels(in.Pubkey)
+		pubkey, err := hex.DecodeString(in.Pubkey)
 		if err != nil {
 			return nil, err
 		}
-		pendingChannels, err := getPendingNodeChannels(in.Pubkey)
+
+		channelCount, err := client.GetNodeChannelCount(pubkey)
 		if err != nil {
 			return nil, err
 		}
@@ -126,33 +119,25 @@ func (s *server) OpenChannel(ctx context.Context, in *lspdrpc.OpenChannelRequest
 		}
 		log.Printf("os.Getenv(\"CHANNEL_PRIVATE\"): %v, isPrivate: %v, err: %v",
 			os.Getenv("CHANNEL_PRIVATE"), isPrivate, err)
-		var txidStr string
-		var outputIndex uint32
-		if len(nodeChannels) == 0 && len(pendingChannels) == 0 {
-			response, err := client.OpenChannelSync(clientCtx, &lnrpc.OpenChannelRequest{
-				LocalFundingAmount: channelAmount,
-				NodePubkeyString:   in.Pubkey,
-				PushSat:            0,
-				TargetConf:         targetConf,
-				MinHtlcMsat:        minHtlcMsat,
-				Private:            isPrivate,
+		var outPoint *wire.OutPoint
+		if channelCount == 0 {
+			outPoint, err = client.OpenChannel(&OpenChannelRequest{
+				CapacitySat: uint64(channelAmount),
+				Destination: pubkey,
+				TargetConf:  targetConf,
+				MinHtlcMsat: minHtlcMsat,
+				IsPrivate:   isPrivate,
 			})
-			log.Printf("Response from OpenChannel: %#v (TX: %v)", response, hex.EncodeToString(response.GetFundingTxidBytes()))
 
 			if err != nil {
 				log.Printf("Error in OpenChannel: %v", err)
 				return nil, err
 			}
 
-			txid, _ := chainhash.NewHash(response.GetFundingTxidBytes())
-			outputIndex = response.GetOutputIndex()
-			// don't fail the request in case we can't format the channel id from
-			// some reason...
-			if txid != nil {
-				txidStr = txid.String()
-			}
+			log.Printf("Response from OpenChannel: (TX: %v)", outPoint.String())
 		}
-		return &lspdrpc.OpenChannelReply{TxHash: txidStr, OutputIndex: outputIndex}, nil
+
+		return &lspdrpc.OpenChannelReply{TxHash: outPoint.Hash.String(), OutputIndex: outPoint.Index}, nil
 	})
 
 	if err != nil {
@@ -212,10 +197,10 @@ func (s *server) CheckChannels(ctx context.Context, in *lspdrpc.Encrypted) (*lsp
 		log.Printf("getNotFakeChannels(%v) error: %v", checkChannelsRequest.FakeChannels, err)
 		return nil, fmt.Errorf("getNotFakeChannels(%v) error: %w", checkChannelsRequest.FakeChannels, err)
 	}
-	closedChannels, err := getClosedChannels(nodeID, checkChannelsRequest.WaitingCloseChannels)
+	closedChannels, err := client.GetClosedChannels(nodeID, checkChannelsRequest.WaitingCloseChannels)
 	if err != nil {
-		log.Printf("getNotFakeChannels(%v) error: %v", checkChannelsRequest.FakeChannels, err)
-		return nil, fmt.Errorf("getNotFakeChannels(%v) error: %w", checkChannelsRequest.FakeChannels, err)
+		log.Printf("GetClosedChannels(%v) error: %v", checkChannelsRequest.FakeChannels, err)
+		return nil, fmt.Errorf("GetClosedChannels(%v) error: %w", checkChannelsRequest.FakeChannels, err)
 	}
 	checkChannelsReply := lspdrpc.CheckChannelsReply{
 		NotFakeChannels: notFakeChannels,
@@ -256,72 +241,6 @@ func getNotFakeChannels(nodeID string, channelPoints map[string]uint64) (map[str
 	return r, nil
 }
 
-func getClosedChannels(nodeID string, channelPoints map[string]uint64) (map[string]uint64, error) {
-	r := make(map[string]uint64)
-	if len(channelPoints) == 0 {
-		return r, nil
-	}
-	waitingCloseChannels, err := getWaitingCloseChannels(nodeID)
-	if err != nil {
-		return nil, err
-	}
-	wcc := make(map[string]struct{})
-	for _, c := range waitingCloseChannels {
-		wcc[c.Channel.ChannelPoint] = struct{}{}
-	}
-	for c, h := range channelPoints {
-		if _, ok := wcc[c]; !ok {
-			r[c] = h
-		}
-	}
-	return r, nil
-}
-
-func getWaitingCloseChannels(nodeID string) ([]*lnrpc.PendingChannelsResponse_WaitingCloseChannel, error) {
-	clientCtx := metadata.AppendToOutgoingContext(context.Background(), "macaroon", os.Getenv("LND_MACAROON_HEX"))
-	pendingResponse, err := client.PendingChannels(clientCtx, &lnrpc.PendingChannelsRequest{})
-	if err != nil {
-		return nil, err
-	}
-	var waitingCloseChannels []*lnrpc.PendingChannelsResponse_WaitingCloseChannel
-	for _, p := range pendingResponse.WaitingCloseChannels {
-		if p.Channel.RemoteNodePub == nodeID {
-			waitingCloseChannels = append(waitingCloseChannels, p)
-		}
-	}
-	return waitingCloseChannels, nil
-}
-
-func getNodeChannels(nodeID string) ([]*lnrpc.Channel, error) {
-	clientCtx := metadata.AppendToOutgoingContext(context.Background(), "macaroon", os.Getenv("LND_MACAROON_HEX"))
-	listResponse, err := client.ListChannels(clientCtx, &lnrpc.ListChannelsRequest{})
-	if err != nil {
-		return nil, err
-	}
-	var nodeChannels []*lnrpc.Channel
-	for _, channel := range listResponse.Channels {
-		if channel.RemotePubkey == nodeID {
-			nodeChannels = append(nodeChannels, channel)
-		}
-	}
-	return nodeChannels, nil
-}
-
-func getPendingNodeChannels(nodeID string) ([]*lnrpc.PendingChannelsResponse_PendingOpenChannel, error) {
-	clientCtx := metadata.AppendToOutgoingContext(context.Background(), "macaroon", os.Getenv("LND_MACAROON_HEX"))
-	pendingResponse, err := client.PendingChannels(clientCtx, &lnrpc.PendingChannelsRequest{})
-	if err != nil {
-		return nil, err
-	}
-	var pendingChannels []*lnrpc.PendingChannelsResponse_PendingOpenChannel
-	for _, p := range pendingResponse.PendingOpenChannels {
-		if p.Channel.RemoteNodePub == nodeID {
-			pendingChannels = append(pendingChannels, p)
-		}
-	}
-	return pendingChannels, nil
-}
-
 func main() {
 	if len(os.Args) > 1 && os.Args[1] == "genkey" {
 		p, err := btcec.NewPrivateKey()
@@ -363,25 +282,9 @@ func main() {
 		}
 	}
 
-	// Creds file to connect to LND gRPC
-	cp := x509.NewCertPool()
-	if !cp.AppendCertsFromPEM([]byte(strings.Replace(os.Getenv("LND_CERT"), "\\n", "\n", -1))) {
-		log.Fatalf("credentials: failed to append certificates")
-	}
-	creds := credentials.NewClientTLSFromCert(cp, "")
+	client = NewLndClient()
 
-	// Address of an LND instance
-	conn, err := grpc.Dial(os.Getenv("LND_ADDRESS"), grpc.WithTransportCredentials(creds))
-	if err != nil {
-		log.Fatalf("Failed to connect to LND gRPC: %v", err)
-	}
-	defer conn.Close()
-	client = lnrpc.NewLightningClient(conn)
-	routerClient = routerrpc.NewRouterClient(conn)
-	chainNotifierClient = chainrpc.NewChainNotifierClient(conn)
-
-	clientCtx := metadata.AppendToOutgoingContext(context.Background(), "macaroon", os.Getenv("LND_MACAROON_HEX"))
-	info, err := client.GetInfo(clientCtx, &lnrpc.GetInfoRequest{})
+	info, err := client.GetInfo()
 	if err != nil {
 		log.Fatalf("client.GetInfo() error: %v", err)
 	}
@@ -389,13 +292,13 @@ func main() {
 		nodeName = info.Alias
 	}
 	if nodePubkey == "" {
-		nodePubkey = info.IdentityPubkey
+		nodePubkey = info.Pubkey
 	}
 
-	go intercept()
+	go intercept(client)
 
-	go forwardingHistorySynchronize()
-	go channelsSynchronize(chainNotifierClient)
+	go forwardingHistorySynchronize(client)
+	go channelsSynchronize(client)
 
 	s := grpc.NewServer(
 		grpc_middleware.WithUnaryServerChain(func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {