File

util/watchdog.lua @ 12179:5e68635cdc2c

mod_http_file_share: Always measure total disk usage for statistics! Metrics available or not depending on configuration is weird, even tho it might be expensive to calculate and it's only really needed when there is a global quota. Default quota is set to infinity, which is essentially what it was. Reports NaN if there is an error, which should count as over the infinite default quota.
author Kim Alvefur <zash@zash.se>
date Tue, 11 Jan 2022 04:15:29 +0100
parent 8555:4f0f5b49bb03
child 12545:5059a639f61e
line wrap: on
line source

local timer = require "util.timer";
local setmetatable = setmetatable;
local os_time = os.time;

local _ENV = nil;
-- luacheck: std none

local watchdog_methods = {};
local watchdog_mt = { __index = watchdog_methods };

local function new(timeout, callback)
	local watchdog = setmetatable({ timeout = timeout, last_reset = os_time(), callback = callback }, watchdog_mt);
	timer.add_task(timeout+1, function (current_time)
		local last_reset = watchdog.last_reset;
		if not last_reset then
			return;
		end
		local time_left = (last_reset + timeout) - current_time;
		if time_left < 0 then
			return watchdog:callback();
		end
		return time_left + 1;
	end);
	return watchdog;
end

function watchdog_methods:reset()
	self.last_reset = os_time();
end

function watchdog_methods:cancel()
	self.last_reset = nil;
end

return {
	new = new;
};