Fixed #2959 handle new -X/-x settings when the respective messages appear

scripts/lua/modules/configuration_utils.lua

@@ -0,0 +1,60 @@
+--
+-- (C) 2013-20 - ntop.org
+--
+
+require "lua_utils"
+local sys_utils = require "sys_utils"
+local rest_utils = require("rest_utils")
+
+local conf_utils = {}
+
+local redis_key = "increased_max_num_host_or_flows"
+local dir = "/bin/ntopng/ntopng-config"
+
+-- ################################################################
+
+function conf_utils.increase_num_host_num_flows(incr_num_hosts, incr_num_flows)
+    local exit_status = ""
+
+    -- Double the value of the hosts or of the flows
+    if incr_num_hosts then
+        exit_status = sys_utils.execShellCmd(dir .. " -x *2")
+    elseif incr_num_flows then
+        exit_status = sys_utils.execShellCmd(dir .. " -X *2")
+    end
+
+    local res = {
+        exit_status = exit_status
+    }
+
+    if string.match(exit_status, "succesfully changed") then
+        -- Set the redis key for the restart
+        ntop.setCache(redis_key, true)
+        rest_utils.answer(rest_utils.consts.success.ok, res)
+        return
+    end
+
+    rest_utils.answer(rest_utils.consts.err.internal_error, res)
+end
+
+-- #################################
+
+function conf_utils.restart_required()
+    if ntop.getCache(redis_key) == '' then
+        return false
+    end
+
+    return true
+end
+
+-- #################################
+
+function conf_utils.reset()
+    if ntop.getCache(redis_key) ~= '' then
+        ntop.delCache(redis_key)
+    end
+end
+
+-- #################################
+
+return conf_utils