From 9100be5ba53af32e3c7133013fdfb518442b36d1 Mon Sep 17 00:00:00 2001
From: Boris Nagaev <bnagaev@gmail.com>
Date: Sat, 21 Jun 2025 12:19:31 -0300
Subject: [PATCH] lntest: add method P2PAddr to backend

It is useful if we want to keep bitcoind main itest mode, but connect one node
using neutrino.
---
 lntest/bitcoind_common.go | 5 +++++
 lntest/btcd.go            | 5 +++++
 lntest/neutrino.go        | 5 +++++
 lntest/node/config.go     | 3 +++
 4 files changed, 18 insertions(+)

diff --git a/lntest/bitcoind_common.go b/lntest/bitcoind_common.go
index ed3c45f02..6d5cacc43 100644
--- a/lntest/bitcoind_common.go
+++ b/lntest/bitcoind_common.go
@@ -85,6 +85,11 @@ func (b BitcoindBackendConfig) Name() string {
 	return "bitcoind"
 }
 
+// P2PAddr return bitcoin p2p ip:port.
+func (b BitcoindBackendConfig) P2PAddr() (string, error) {
+	return fmt.Sprintf("127.0.0.1:%d", b.p2pPort), nil
+}
+
 // newBackend starts a bitcoind node with the given extra parameters and returns
 // a BitcoindBackendConfig for that node.
 func newBackend(miner string, netParams *chaincfg.Params, extraArgs []string,
diff --git a/lntest/btcd.go b/lntest/btcd.go
index 91b25411c..21c343243 100644
--- a/lntest/btcd.go
+++ b/lntest/btcd.go
@@ -74,6 +74,11 @@ func (b BtcdBackendConfig) Name() string {
 	return "btcd"
 }
 
+// P2PAddr return bitcoin p2p ip:port.
+func (b BtcdBackendConfig) P2PAddr() (string, error) {
+	return b.harness.P2PAddress(), nil
+}
+
 // NewBackend starts a new rpctest.Harness and returns a BtcdBackendConfig for
 // that node. miner should be set to the P2P address of the miner to connect
 // to.
diff --git a/lntest/neutrino.go b/lntest/neutrino.go
index 11f13612f..568007097 100644
--- a/lntest/neutrino.go
+++ b/lntest/neutrino.go
@@ -54,6 +54,11 @@ func (b NeutrinoBackendConfig) Name() string {
 	return NeutrinoBackendName
 }
 
+// P2PAddr return bitcoin p2p ip:port.
+func (b NeutrinoBackendConfig) P2PAddr() (string, error) {
+	return b.minerAddr, nil
+}
+
 // NewBackend starts and returns a NeutrinoBackendConfig for the node.
 func NewBackend(miner string, _ *chaincfg.Params) (
 	*NeutrinoBackendConfig, func() error, error) {
diff --git a/lntest/node/config.go b/lntest/node/config.go
index 168dc87ec..bd003eb01 100644
--- a/lntest/node/config.go
+++ b/lntest/node/config.go
@@ -114,6 +114,9 @@ type BackendConfig interface {
 	// Credentials returns the rpc username, password and host for the
 	// backend.
 	Credentials() (string, string, string, error)
+
+	// P2PAddr return bitcoin p2p ip:port.
+	P2PAddr() (string, error)
 }
 
 // BaseNodeConfig is the base node configuration.