staticaddr: return error if address already exists

Author: hieblmi

staticaddr/address/interface.go

@@ -2,15 +2,17 @@ package address
 
 import (
 	"context"
-	"fmt"
 
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/lightninglabs/loop/staticaddr/version"
 	"github.com/lightningnetwork/lnd/keychain"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 var (
-	ErrAddressAlreadyExists = fmt.Errorf("address already exists")
+	ErrAddressAlreadyExists = status.Error(codes.AlreadyExists,
+		"address already exists")
 )
 
 // Store is the database interface that is used to store and retrieve

staticaddr/address/manager.go

@@ -104,13 +104,9 @@ func (m *Manager) NewAddress(ctx context.Context) (*btcutil.AddressTaproot,
 		return nil, err
 	}
 	if len(addresses) > 0 {
-		clientPubKey := addresses[0].ClientPubkey
-		serverPubKey := addresses[0].ServerPubkey
-		expiry := int64(addresses[0].Expiry)
-
 		m.Unlock()
 
-		return m.GetTaprootAddress(clientPubKey, serverPubKey, expiry)
+		return nil, ErrAddressAlreadyExists
 	}
 	m.Unlock()