add hook for init_by_lua_block

main.lua

@@ -12,6 +12,12 @@ require('util')
 
 ctx:loadFromConfig(config.loadConfigFile())
 
-return function()
+return {
+    init=function ()
+        -- validate config and print out errors
+        config.loadConfigFile()
+    end,
+    access=function()
         ctx:onRequest()
     end
+}

nginx.conf

@@ -1,3 +1,7 @@
+init_by_lua_block {
+  require("aproxy.main").init()
+}
+
 server {
     listen 80;
     lua_code_cache off;
@@ -7,7 +11,7 @@
 
       # must happen before proxy_pass
       access_by_lua_block {
-        require("aproxy.main")()
+        require("aproxy.main").access()
       }
 
       proxy_pass http://localhost:9999;