staticaddr: return error if address already exists

Author: hieblmi

cmd/loop/staticaddr.go

@@ -75,8 +75,7 @@ func newStaticAddress(ctx *cli.Context) error {
 		return err
 	}
 
-	fmt.Printf("Received a new static loop-in address from the server: "+
-		"%s\n", resp.Address)
+	printRespJSON(resp)
 
 	return nil
 }

loopd/swapclient_server.go

@@ -1505,13 +1505,14 @@ func (s *swapClientServer) NewStaticAddress(ctx context.Context,
 	_ *looprpc.NewStaticAddressRequest) (
 	*looprpc.NewStaticAddressResponse, error) {
 
-	staticAddress, err := s.staticAddressManager.NewAddress(ctx)
+	staticAddress, expiry, err := s.staticAddressManager.NewAddress(ctx)
 	if err != nil {
 		return nil, err
 	}
 
 	return &looprpc.NewStaticAddressResponse{
 		Address: staticAddress.String(),
+		Expiry:  uint32(expiry),
 	}, nil
 }
 

staticaddr/address/interface.go

@@ -2,17 +2,12 @@ package address
 
 import (
 	"context"
-	"fmt"
 
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/lightninglabs/loop/staticaddr/version"
 	"github.com/lightningnetwork/lnd/keychain"
 )
 
-var (
-	ErrAddressAlreadyExists = fmt.Errorf("address already exists")
-)
-
 // Store is the database interface that is used to store and retrieve
 // static addresses.
 type Store interface {

staticaddr/address/manager.go

@@ -90,9 +90,10 @@ func (m *Manager) Run(ctx context.Context) error {
 	}
 }
 
-// NewAddress starts a new address creation flow.
+// NewAddress creates a new static address with the server or returns an
+// existing one.
 func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
-	error) {
+	int64, error) {
 
 	// If there's already a static address in the database, we can return
 	// it.
@@ -101,31 +102,38 @@ func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
 	if err != nil {
 		m.Unlock()
 
-		return nil, err
+		return nil, 0, err
 	}
 	if len(addresses) > 0 {
 		clientPubKey := addresses[0].ClientPubkey
 		serverPubKey := addresses[0].ServerPubkey
 		expiry := int64(addresses[0].Expiry)
 
-		m.Unlock()
+		defer m.Unlock()
+
+		address, err := m.GetTaprootAddress(
+			clientPubKey, serverPubKey, expiry,
+		)
+		if err != nil {
+			return nil, 0, err
+		}
 
-		return m.GetTaprootAddress(clientPubKey, serverPubKey, expiry)
+		return address, expiry, nil
 	}
 	m.Unlock()
 
 	// We are fetching a new L402 token from the server. There is one static
 	// address per L402 token allowed.
 	err = m.cfg.FetchL402(ctx)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	clientPubKey, err := m.cfg.WalletKit.DeriveNextKey(
 		ctx, swap.StaticAddressKeyFamily,
 	)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	// Send our clientPubKey to the server and wait for the server to
@@ -138,27 +146,27 @@ func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
 		},
 	)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	serverParams := resp.GetParams()
 
 	serverPubKey, err := btcec.ParsePubKey(serverParams.ServerKey)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	staticAddress, err := script.NewStaticAddress(
 		input.MuSig2Version100RC2, int64(serverParams.Expiry),
 		clientPubKey.PubKey, serverPubKey,
 	)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	pkScript, err := staticAddress.StaticAddressScript()
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	// Create the static address from the parameters the server provided and
@@ -179,7 +187,7 @@ func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
 	}
 	err = m.cfg.Store.CreateStaticAddress(ctx, addrParams)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	// Import the static address tapscript into our lnd wallet, so we can
@@ -189,15 +197,20 @@ func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
 	)
 	addr, err := m.cfg.WalletKit.ImportTaprootScript(ctx, tapScript)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	log.Infof("Imported static address taproot script to lnd wallet: %v",
 		addr)
 
-	return m.GetTaprootAddress(
+	address, err := m.GetTaprootAddress(
 		clientPubKey.PubKey, serverPubKey, int64(serverParams.Expiry),
 	)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	return address, int64(serverParams.Expiry), nil
 }
 
 // GetTaprootAddress returns a taproot address for the given client and server