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Implement i18n lazy loading

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Fixes #3096
This commit is contained in:
emanuele-f 2019-12-12 18:23:12 +01:00
parent 8883a5321a
commit 52df5b25dc
1 changed files with 71 additions and 35 deletions
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106
scripts/lua/modules/locales_utils.lua
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@ -7,10 +7,25 @@ local dirs = ntop.getDirs()
local locales = {}
-- ##############################################
local default_locale = "en"
local default_locale_path = dirs.installdir..'/scripts/locales/en.lua'
local available_locales = {}
local locales_initialized = false
function i18n.loadLocaleFile(path, locale)
local supported_locales = {
{code = "en"},
{code = "it"},
{code = "de"},
{code = "jp"},
{code = "pt"},
{code = "cz"}
}
-- ##############################################
function locales.loadLocaleFile(path, locale)
local chunk = assert(loadfile(path))
local data = chunk()
@ -30,28 +45,7 @@ function i18n.loadLocaleFile(path, locale)
i18n.load({[locale]=data})
end
-- Provides a fallback for not already localized strings
i18n.loadLocaleFile(default_locale_path, default_locale)
locales.default_locale = default_locale
-- language is a global variable set from C that corresponds to the user default language
-- it may be null when lua_utils are imported from periodic scripts
if language == nil then
local admin_lang = ntop.getPref("ntopng.user.admin.language")
language = ternary(isEmptyString(admin_lang), locales.default_locale, admin_lang)
end
i18n.setLocale(language)
local supported_locales = {
{code = "en"},
{code = "it"},
{code = "de"},
{code = "jp"},
{code = "pt"},
{code = "cz"}
}
-- ##############################################
local function lookupLocale(localename)
local base_path = dirs.installdir..'/scripts/locales/'
@ -64,29 +58,54 @@ local function lookupLocale(localename)
return nil
end
-- Note: en already loaded
if (language ~= "en") and (not ntop.isnEdge()) then
local locale_path = lookupLocale(language)
-- ##############################################
if locale_path then
i18n.loadLocaleFile(locale_path, language)
local function initLocales()
if(locales_initialized) then
-- Already initialized
return
end
end
local available_locales = {}
-- Provides a fallback for not already localized strings
locales.loadLocaleFile(default_locale_path, default_locale)
-- use pairsByKeys to impose an order
for _, locale in ipairs(supported_locales) do
local localename = locale["code"]
locales.default_locale = default_locale
if lookupLocale(localename) then
available_locales[#available_locales + 1] = locale
-- language is a global variable set from C that corresponds to the user default language
-- it may be null when lua_utils are imported from periodic scripts
if language == nil then
local admin_lang = ntop.getPref("ntopng.user.admin.language")
language = ternary(isEmptyString(admin_lang), locales.default_locale, admin_lang)
end
i18n.setLocale(language)
-- Note: en already loaded
if (language ~= "en") and (not ntop.isnEdge()) then
local locale_path = lookupLocale(language)
if locale_path then
locales.loadLocaleFile(locale_path, language)
end
end
-- use pairsByKeys to impose an order
for _, locale in ipairs(supported_locales) do
local localename = locale["code"]
if lookupLocale(localename) then
available_locales[#available_locales + 1] = locale
end
end
locales_initialized = true
end
-- ##############################################
function locales.getAvailableLocales()
initLocales()
return available_locales
end
@ -102,4 +121,21 @@ end
-- ##############################################
-- Locales lazy loading: only load them when a script calls i18n(...)
local orig_i18n_metatable = getmetatable(i18n)
local i18n_mt = {}
-- Replace the i18n(...) invocation
function i18n_mt.__call(...)
-- ensure that the loacales are loaded
initLocales()
-- call the original i18n function
return(orig_i18n_metatable.__call(...))
end
setmetatable(i18n, i18n_mt)
-- ##############################################
return locales