Add timeattack detector

mtglib/init.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"net"
 	"net/http"
+	"time"
 )
 
 var (
@@ -46,6 +47,10 @@ type EventStream interface {
 	Shutdown()
 }
 
+type TimeAttackDetector interface {
+	Valid(time.Time) error
+}
+
 type Logger interface {
 	Named(name string) Logger