loop: expose server grpc connection

Author: sputn1ck

client.go

@@ -19,6 +19,7 @@ import (
 	"github.com/lightninglabs/loop/sweep"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/routing/route"
+	"google.golang.org/grpc"
 	"google.golang.org/grpc/status"
 )
 
@@ -148,6 +149,7 @@ func NewClient(dbDir string, loopDB loopdb.SwapStore,
 		LndServices: cfg.Lnd,
 		Server:      swapServerClient,
 		Store:       loopDB,
+		Conn:        swapServerClient.conn,
 		LsatStore:   lsatStore,
 		CreateExpiryTimer: func(d time.Duration) <-chan time.Time {
 			return time.NewTimer(d).C
@@ -200,6 +202,11 @@ func NewClient(dbDir string, loopDB loopdb.SwapStore,
 	return client, cleanup, nil
 }
 
+// GetConn returns the gRPC connection to the server.
+func (s *Client) GetConn() *grpc.ClientConn {
+	return s.clientConfig.Conn
+}
+
 // FetchSwaps returns all loop in and out swaps currently in the database.
 func (s *Client) FetchSwaps(ctx context.Context) ([]*SwapInfo, error) {
 	loopOutSwaps, err := s.Store.FetchLoopOutSwaps(ctx)

config.go

@@ -6,12 +6,14 @@ import (
 	"github.com/lightninglabs/aperture/lsat"
 	"github.com/lightninglabs/lndclient"
 	"github.com/lightninglabs/loop/loopdb"
+	"google.golang.org/grpc"
 )
 
 // clientConfig contains config items for the swap client.
 type clientConfig struct {
 	LndServices       *lndclient.LndServices
 	Server            swapServerClient
+	Conn              *grpc.ClientConn
 	Store             loopdb.SwapStore
 	LsatStore         lsat.Store
 	CreateExpiryTimer func(expiry time.Duration) <-chan time.Time