Migrates alerts to an object-oriented implementation

scripts/lua/modules/alert_definitions/alert_udp_unidirectional.lua

@@ -2,22 +2,42 @@
 -- (C) 2019-20 - ntop.org
 --
 
+-- ##############################################
+
 local alert_keys = require "alert_keys"
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
 
--- @brief Prepare an alert table used to generate the alert
--- @param alert_severity A severity as defined in `alert_severities`
--- @return A table with the alert built
-local function createUDPUnidirectional()
-   local built = {
-      alert_type_params = {},
-   }
+local status_keys = require "flow_keys"
+-- Import the classes library.
+local classes = require "classes"
+-- Make sure to import the Superclass!
+local alert = require "alert"
 
-   return built
-end
+-- ##############################################
 
-return {
+local alert_udp_unidirectional = classes.class(alert)
+
+-- ##############################################
+
+alert_udp_unidirectional.meta = {
+  status_key = status_keys.ntopng.status_udp_unidirectional,
   alert_key = alert_keys.ntopng.alert_udp_unidirectional,
   i18n_title = "flow_details.udp_unidirectional",
   icon = "fas fa-info-circle",
-  creator = createUDPUnidirectional,
 }
+
+-- ##############################################
+
+-- @brief Prepare an alert table used to generate the alert
+-- @return A table with the alert built
+function alert_udp_unidirectional:init()
+   -- Call the parent constructor
+   self.super:init()
+
+   self.alert_type_params = {}
+end
+
+-- #######################################################
+
+return alert_udp_unidirectional
+