From 7c05b33b2d479af3be00fb471c9b85649b0291d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Wed, 8 Nov 2023 11:29:54 +0800
Subject: [PATCH] Add common.Top func

---
 common/upstream.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/common/upstream.go b/common/upstream.go
index 0bf7a5b..9af3604 100644
--- a/common/upstream.go
+++ b/common/upstream.go
@@ -31,3 +31,13 @@ func MustCast[T any](obj any) T {
 	}
 	return value
 }
+
+func Top(obj any) any {
+	if u, ok := obj.(WithUpstream); ok {
+		return Top(u.Upstream())
+	}
+	if u, ok := obj.(stdWithUpstreamNetConn); ok {
+		return Top(u.NetConn())
+	}
+	return obj
+}