diff --git a/config.lua b/config.lua
index 278ee9b..451a3e7 100644
--- a/config.lua
+++ b/config.lua
@@ -2,19 +2,8 @@ local env_config_path = os.getenv('APROXY_CONFIG_PATH')
 local DEFAULT_CONFIG_PATH = ".;/etc/aproxy"
 local config_path = env_config_path or DEFAULT_CONFIG_PATH
 
-function mysplit (inputstr, sep)
-        if sep == nil then
-                sep = "%s"
-        end
-        local t={}
-        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
-                table.insert(t, str)
-        end
-        return t
-end
-
 local function findConfigFile()
-    for _, config_directory in ipairs(mysplit(config_path, ";")) do
+    for _, config_directory in ipairs(string.split(config_path, ";")) do
         local possible_config_path = config_directory .. "/" .. "conf.lua"
         local fd, res = io.open(possible_config_path, "rb")
         if fd then
@@ -37,7 +26,7 @@ end
 
 local function fakeTableSchema(value_schema)
     return setmetatable({ __list = true }, {
-        __index = function (self, key)
+        __index = function ()
             return value_schema
         end
     })
@@ -45,8 +34,8 @@ end
 
 local SPECIAL_KEYS = {__list = true}
 
-local function validateSchema(schema, input, errors)
-    local errors = errors or {}
+local function validateSchema(schema, input, errors_in)
+    local errors = errors_in or {}
     if schema.__list then
         -- generate full schema for lists that are same size as input
         for k, _ in pairs(input) do schema[k] = schema.__schema_value end
@@ -105,12 +94,8 @@ local function validateConfigFile(config_object)
     return all_schema_errors
 end
 
-local function writeSchemaErrors(errors, out)
-    out('sex')
-end
-
-local function loadConfigFile(options)
-    local options = options or {}
+local function loadConfigFile(options_in)
+    local options = options_in or {}
 
     local config_file_data = assert(findConfigFile(), 'no config file found, config path: ' .. config_path)
     local config_file_function = assert(loadstring(config_file_data))
diff --git a/ctx.lua b/ctx.lua
index 78e3239..fb43089 100644
--- a/ctx.lua
+++ b/ctx.lua
@@ -1,3 +1,5 @@
+local util = require("util")
+
 function log(msg)
     ngx.log(ngx.STDERR, tostring(msg))
 end
@@ -13,13 +15,14 @@ function ctx:loadFromConfig(conf)
     ctx:loadChain()
 end
 
+
 function ctx:loadChain()
     self.compiled_chain = {}
     for module_name, module_config in pairs(self._wanted_scripts) do
         local module = require('scripts.' .. module_name)
-        local module_state = module.init(module_config)
-        -- TODO is it possible to make module_config readonly?
-        table.insert(self.compiled_chain, {module, module_config, module_state})
+        local module_config_readonly = table.readonly(module_config)
+        local module_state = module.init(module_config_readonly)
+        table.insert(self.compiled_chain, {module, module_config_readonly, module_state})
     end
 end
 
@@ -32,7 +35,7 @@ function ctx:onRequest()
         local module, module_config, state = unpack(filter)
 
         for callback_regex, callback_function in pairs(module.callbacks) do
-            local match, error = ngx.re.match(request_uri, callback_regex)
+            local match = ngx.re.match(request_uri, callback_regex)
             if match then
                 table.insert(callbacks_to_call, {module, callback_function, module_config, state})
             end
@@ -47,6 +50,7 @@ function ctx:onRequest()
             ngx.status = status_code
             ngx.say(body or "request denied")
             ngx.exit(status_code)
+            return
         end
     end
 end
diff --git a/main.lua b/main.lua
index b0cf8ff..0470522 100644
--- a/main.lua
+++ b/main.lua
@@ -1,11 +1,3 @@
-
--- function loadConfig()
---     -- TODO load config_path
---     return require("./config.lua")
--- end
--- 
--- local config = loadConfig()
-
 local ctx = require('ctx')
 local config = require('config')
 require('util')
diff --git a/scripts/webfinger_allowlist.lua b/scripts/webfinger_allowlist.lua
index 41d5c80..7e7355f 100644
--- a/scripts/webfinger_allowlist.lua
+++ b/scripts/webfinger_allowlist.lua
@@ -1,4 +1,4 @@
-function webfingerInit(cfg)
+local function webfingerInit(cfg)
     local accounts_set = {}
     for _, account in ipairs(cfg.accounts) do
         accounts_set["acct:" .. account] = true
@@ -6,7 +6,7 @@ function webfingerInit(cfg)
     return accounts_set
 end
 
-function webfingerCallback(cfg, accounts_set)
+local function webfingerCallback(cfg, accounts_set)
     local args, err = ngx.req.get_uri_args()
     if err == "truncated" then
       return 400, 'uri args too long'
diff --git a/test.lua b/test.lua
index 968117b..ded2270 100644
--- a/test.lua
+++ b/test.lua
@@ -64,7 +64,7 @@ function setupTest(module_require_path, input_config)
     local count = table.pprint(schema_errors)
     lu.assertIs(count, 0)
 
-    state = module.init(input_config)
+    local state = module.init(input_config)
     ctx.compiled_chain = {
         {module, input_config, state}
     }
@@ -74,9 +74,9 @@ end
 
 function onRequest()
     ctx:setWantedScripts()
-    local ctx = require('ctx')
+    local context = require('ctx')
     do
-        ctx:onRequest()
+        context:onRequest()
     end
 end
 
diff --git a/util.lua b/util.lua
index 4db2229..5c0b74f 100644
--- a/util.lua
+++ b/util.lua
@@ -4,11 +4,11 @@ function table.len(t)
   return count
 end
 
-function table.pprint(t, options, ident, total_count)
-    local ident = ident or 0
-    local total_count = total_count or 0
+function table.pprint(t, options_in, ident_in, total_count_in)
+    local ident = ident_in or 0
+    local total_count = total_count_in or 0
 
-    local options = options or {}
+    local options = options_in or {}
     local print_function = options.call or print
     if type(t) == 'table' then
         local count = 0
@@ -18,7 +18,7 @@ function table.pprint(t, options, ident, total_count)
             total_count = table.pprint(v, options, ident + 1, total_count)
         end
         if count == 0 then
-            --print('<empty table>')
+            print_function('{}')
         end
     else
         print_function(string.rep('\t', ident) .. tostring(t))
@@ -26,3 +26,26 @@ function table.pprint(t, options, ident, total_count)
     end
     return total_count
 end
+
+function table.readonly(t)
+   return setmetatable({}, {
+     __index = t,
+     __newindex = function ()
+                    error("Attempt to modify read-only table")
+                  end,
+     __metatable = false
+   });
+end
+
+function string.split(inputstr, sep)
+    if sep == nil then
+        sep = "%s"
+    end
+    local t={}
+    for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
+        table.insert(t, str)
+    end
+    return t
+end
+
+