From 1d7e382097319b66a4e1716a5c6bc8b7886b1fe7 Mon Sep 17 00:00:00 2001
From: Conner Fromknecht <conner@lightning.engineering>
Date: Wed, 31 Oct 2018 20:42:07 -0700
Subject: [PATCH] watchtower/lookout/log: adds lookout subsystem logger

---
 watchtower/lookout/log.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 watchtower/lookout/log.go

diff --git a/watchtower/lookout/log.go b/watchtower/lookout/log.go
new file mode 100644
index 000000000..b569b4ae0
--- /dev/null
+++ b/watchtower/lookout/log.go
@@ -0,0 +1,29 @@
+package lookout
+
+import (
+	"github.com/btcsuite/btclog"
+	"github.com/lightningnetwork/lnd/build"
+)
+
+// log is a logger that is initialized with no output filters.  This
+// means the package will not perform any logging by default until the caller
+// requests it.
+var log btclog.Logger
+
+// The default amount of logging is none.
+func init() {
+	UseLogger(build.NewSubLogger("WTWR", nil))
+}
+
+// DisableLog disables all library log output.  Logging output is disabled
+// by default until UseLogger is called.
+func DisableLog() {
+	UseLogger(btclog.Disabled)
+}
+
+// UseLogger uses a specified Logger to output package logging info.
+// This should be used in preference to SetLogWriter if the caller is also
+// using btclog.
+func UseLogger(logger btclog.Logger) {
+	log = logger
+}