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--
-- (C) 2014-22 - ntop.org
--
local prefs_reload_utils = {}
-- ###########################################
-- Key used to determine if it is time to reload in-memory preferences.
-- This key is set by Redis.cpp, when a preference is changed.
-- NOTE: keep it in sync with ntop_defines.h PREFS_CHANGED
local prefs_changed_key = "ntopng.cache.prefs_changed"
-- Key used to enable periodic runtime preferences dump to file.
-- This key, disabled by default, can be enabled when ntopng is run on appliances
-- that don't feature a persistent Redis. In this case, it may be useful to dump
-- changed preferences to a file and to restore them during boot in boot.lua.
local dump_prefs_to_disk_key = "ntopng.prefs.dump_prefs_to_disk"
-- Key used to request the dump of runtime preferences to dump file.
-- Actual dump is performed in prefs_dump_utils.lua.
-- NOTE: This key is only set when dump_prefs_to_disk_key is enabled and thus the dump can be requested.
local prefs_dump_request_key = "ntopng.cache.prefs_dump_request"
-- ###########################################
function prefs_reload_utils.is_dump_prefs_to_disk_enabled()
local prefs_to_disk = ntop.getCache(dump_prefs_to_disk_key)
return prefs_to_disk == "1"
end
-- ###########################################
function prefs_reload_utils.is_dump_prefs_to_disk_requested()
local dump_requested = ntop.getCache(prefs_dump_request_key)
if dump_requested == "1" then
-- Delete before doing the dump to guarantee no other dump request will be lost
ntop.delCache(prefs_dump_request_key)
return true
end
return false
end
-- ###########################################
local function are_prefs_changed()
local prefs_changed = ntop.getCache(prefs_changed_key)
if prefs_changed == "1" then
-- Make sure to delete BEFORE doing the actual reload
-- To guarantee no reload gets missed
ntop.delCache(prefs_changed_key)
return true
end
return false
end
-- ###########################################
-- @brief Checks and possibly reload in-memory preferences from Redis
-- Reload is performed when Redis preferences are changed, to re-align them with in-memory preferences
function prefs_reload_utils.check_reload_prefs()
if are_prefs_changed() then
-- Do the actual reload
ntop.reloadPreferences()
-- Finally check if preferences dump to disk is enabled and,
-- in that case, request for the dump
if prefs_reload_utils.is_dump_prefs_to_disk_enabled() then
ntop.setCache(prefs_dump_request_key, "1")
end
end
end
-- ###########################################
return prefs_reload_utils
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