multi: add persistent logger

log.go

@@ -0,0 +1,38 @@
+package kirin
+
+import (
+	"github.com/btcsuite/btclog"
+	"github.com/lightninglabs/kirin/auth"
+	"github.com/lightninglabs/kirin/proxy"
+	"github.com/lightningnetwork/lnd/build"
+)
+
+var (
+	logWriter = build.NewRotatingLogWriter()
+
+	log = build.NewSubLogger("MAIN", logWriter.GenSubLogger)
+)
+
+func init() {
+	setSubLogger("MAIN", log, nil)
+	addSubLogger("AUTH", auth.UseLogger)
+	addSubLogger("PRXY", proxy.UseLogger)
+}
+
+// addSubLogger is a helper method to conveniently create and register the
+// logger of a sub system.
+func addSubLogger(subsystem string, useLogger func(btclog.Logger)) {
+	logger := build.NewSubLogger(subsystem, logWriter.GenSubLogger)
+	setSubLogger(subsystem, logger, useLogger)
+}
+
+// setSubLogger is a helper method to conveniently register the logger of a sub
+// system.
+func setSubLogger(subsystem string, logger btclog.Logger,
+	useLogger func(btclog.Logger)) {
+
+	logWriter.RegisterSubLogger(subsystem, logger)
+	if useLogger != nil {
+		useLogger(logger)
+	}
+}