upstream-hash-by annotation support for dynamic configuraton mode

rootfs/etc/nginx/lua/util.lua

@@ -1,6 +1,17 @@
 local _M = {}
 local string_len = string.len
 
+function _M.split_pair(pair, seperator)
+  local i = pair:find(seperator)
+  if i == nil then
+    return pair, nil
+  else
+    local name = pair:sub(1, i - 1)
+    local value = pair:sub(i + 1, -1)
+    return name, value
+  end
+end
+
 -- this implementation is taken from
 -- https://web.archive.org/web/20131225070434/http://snippets.luacode.org/snippets/Deep_Comparison_of_Two_Values_3
 -- and modified for use in this project