From cba848ea359eac72b4709316f4f6422ff417e827 Mon Sep 17 00:00:00 2001
From: Michal Cichra <michal@cichra.cz>
Date: Wed, 11 Jan 2017 14:21:40 +0100
Subject: [PATCH] [module] detect recursive module loading

---
 apicast/src/module.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/apicast/src/module.lua b/apicast/src/module.lua
index e3476d8b6..d10b7999d 100644
--- a/apicast/src/module.lua
+++ b/apicast/src/module.lua
@@ -65,6 +65,11 @@ local prequire = function(file)
     ok, ret = pcall(dofile, file)
   end
 
+  if type(ret) == 'userdata' then
+    ngx.log(ngx.WARN, 'cyclic require detected: ', debug.traceback())
+    return false, ret
+  end
+
   if ok then
     cache[file] = ret
   else