Migrates alerts to an object-oriented implementation

scripts/lua/modules/alert_definitions/alert_connection_issues.lua

@@ -2,9 +2,32 @@
 -- (C) 2019-20 - ntop.org
 --
 
-local alert_keys = require "alert_keys"
+-- ##############################################
 
--- #######################################################
+local alert_keys = require "alert_keys"
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+
+local status_keys = require "flow_keys"
+local format_utils = require "format_utils"
+-- Import the classes library.
+local classes = require "classes"
+-- Make sure to import the Superclass!
+local alert = require "alert"
+
+-- ##############################################
+
+local alert_connection_issues = classes.class(alert)
+
+-- ##############################################
+
+alert_connection_issues.meta = {
+   status_key = status_keys.ntopng.status_tcp_connection_issues,
+   alert_key = alert_keys.ntopng.alert_connection_issues,
+   i18n_title = "alerts_dashboard.connection_issues",
+   icon = "fas fa-exclamation",
+}
+
+-- ##############################################
 
 -- @brief Prepare an alert table used to generate the alert
 -- @param alert_severity A severity as defined in `alert_severities`
@@ -15,26 +38,31 @@ local alert_keys = require "alert_keys"
 -- @param client_issues A boolean indicating if the client has connection issues
 -- @param server_issues A boolean indicating if the server has connection issues
 -- @return A table with the alert built
-local function createConnectionIssues(tcp_stats, cli2srv_pkts, srv2cli_pkts, is_severe, client_issues, server_issues)
-   local built = {
-      alert_type_params = {
-	 tcp_stats = tcp_stats,
+function alert_connection_issues:init(tcp_stats, cli2srv_pkts, srv2cli_pkts, is_severe, client_issues, server_issues)
+   -- Call the parent constructor
+   self.super:init()
+
+   self.alert_type_params = {
+      tcp_stats = tcp_stats,
 	 cli2srv_pkts = cli2srv_pkts,
 	 srv2cli_pkts = srv2cli_pkts,
 	 is_severe = is_severe,
 	 client_issues = client_issues,
 	 server_issues = server_issues,
-      },
    }
-
-   return built
 end
 
 -- #######################################################
 
-return {
-  alert_key = alert_keys.ntopng.alert_connection_issues,
-  i18n_title = "alerts_dashboard.connection_issues",
-  icon = "fas fa-exclamation",
-  creator = createConnectionIssues,
-}
+-- @brief Format an alert into a human-readable string
+-- @param ifid The integer interface id of the generated alert
+-- @param alert The alert description table, including alert data such as the generating entity, timestamp, granularity, type
+-- @param alert_type_params Table `alert_type_params` as built in the `:init` method
+-- @return A human-readable string
+function alert_connection_issues.format(ifid, alert, alert_type_params)
+   format_utils.formatConnectionIssues(alert_type_params)
+end
+
+-- #######################################################
+
+return alert_connection_issues