From 0db39d4fe617218f8639780a0f0c24b3511f4028 Mon Sep 17 00:00:00 2001
From: Conner Fromknecht <conner@lightning.engineering>
Date: Thu, 20 Jun 2019 16:53:25 -0700
Subject: [PATCH] lnrpc/watchtowerrpc: add WatchtowerBackend configs

---
 lnrpc/watchtowerrpc/config_active.go  | 13 +++++++++++++
 lnrpc/watchtowerrpc/config_default.go |  6 ++++++
 lnrpc/watchtowerrpc/interface.go      | 23 +++++++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 lnrpc/watchtowerrpc/config_active.go
 create mode 100644 lnrpc/watchtowerrpc/config_default.go
 create mode 100644 lnrpc/watchtowerrpc/interface.go

diff --git a/lnrpc/watchtowerrpc/config_active.go b/lnrpc/watchtowerrpc/config_active.go
new file mode 100644
index 00000000..985b49bf
--- /dev/null
+++ b/lnrpc/watchtowerrpc/config_active.go
@@ -0,0 +1,13 @@
+// +build watchtowerrpc
+
+package watchtowerrpc
+
+// Config is the primary configuration struct for the watchtower RPC server. It
+// contains all items required for the RPC server to carry out its duties. The
+// fields with struct tags are meant to parsed as normal configuration options,
+// while if able to be populated, the latter fields MUST also be specified.
+type Config struct {
+	// Tower is the active watchtower which serves as the primary source for
+	// information presented via RPC.
+	Tower WatchtowerBackend
+}
diff --git a/lnrpc/watchtowerrpc/config_default.go b/lnrpc/watchtowerrpc/config_default.go
new file mode 100644
index 00000000..ac40e0bf
--- /dev/null
+++ b/lnrpc/watchtowerrpc/config_default.go
@@ -0,0 +1,6 @@
+// +build !watchtowerrpc
+
+package watchtowerrpc
+
+// Config is empty for non-watchtowerrpc builds.
+type Config struct{}
diff --git a/lnrpc/watchtowerrpc/interface.go b/lnrpc/watchtowerrpc/interface.go
new file mode 100644
index 00000000..aafe3e06
--- /dev/null
+++ b/lnrpc/watchtowerrpc/interface.go
@@ -0,0 +1,23 @@
+package watchtowerrpc
+
+import (
+	"net"
+
+	"github.com/btcsuite/btcd/btcec"
+)
+
+// WatchtowerBackend abstracts access to the watchtower information that is
+// served via RPC connections.
+type WatchtowerBackend interface {
+	// PubKey returns the public key for the watchtower used to
+	// authentication and encrypt traffic with clients.
+	PubKey() *btcec.PublicKey
+
+	// ListeningAddrs returns the listening addresses where the watchtower
+	// server can accept client connections.
+	ListeningAddrs() []net.Addr
+
+	// ExternalIPs returns the addresses where the watchtower can be reached
+	// by clients externally.
+	ExternalIPs() []net.Addr
+}