From c089e9a1b5f25c3fa7c6bfa348188bed74a99341 Mon Sep 17 00:00:00 2001
From: c9s <yoan@maicoin.com>
Date: Wed, 10 Jun 2020 13:53:31 +0800
Subject: [PATCH] add 1m kline window protection

---
 bbgo/kline.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/bbgo/kline.go b/bbgo/kline.go
index d76128889..fe6495ce1 100644
--- a/bbgo/kline.go
+++ b/bbgo/kline.go
@@ -173,6 +173,17 @@ func (k *KLineWindow) Add(line KLine) {
 	*k = append(*k, line)
 }
 
+func (k KLineWindow) Take(size int) KLineWindow {
+	return k[:size]
+}
+
+func (k KLineWindow) Tail(size int) KLineWindow {
+	if len(k) <= size {
+		return k[:]
+	}
+	return k[len(k) - size:]
+}
+
 func (k *KLineWindow) Truncate(size int) {
 	if len(*k) <= size {
 		return