prosody
d77d8fba44ad
util/watchdog.lua

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util/watchdog.lua @ 12358:d77d8fba44ad

util.bit53: Add left- and right shift operations While not used by anything in Prosody, it is known to be used by some 3rd party modules.
author Kim Alvefur <zash@zash.se>
date Mon, 28 Jun 2021 03:56:45 +0200
parent 8555:4f0f5b49bb03
child 12545:5059a639f61e
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0ed617f58404 util.watchdog: Watchdog timer library
Matthew Wild <mwild1@gmail.com>
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1 local timer = require "util.timer";
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2 local setmetatable = setmetatable;
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3 local os_time = os.time;
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4
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5 local _ENV = nil;
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6 -- luacheck: std none
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0ed617f58404 util.watchdog: Watchdog timer library
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8 local watchdog_methods = {};
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9 local watchdog_mt = { __index = watchdog_methods };
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11 local function new(timeout, callback)
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12 local watchdog = setmetatable({ timeout = timeout, last_reset = os_time(), callback = callback }, watchdog_mt);
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13 timer.add_task(timeout+1, function (current_time)
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14 local last_reset = watchdog.last_reset;
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15 if not last_reset then
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16 return;
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17 end
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18 local time_left = (last_reset + timeout) - current_time;
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19 if time_left < 0 then
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189cfe565d03 util.watchdog: Pass watchdog object to callback so that it doesn't always have to be a closure
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20 return watchdog:callback();
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21 end
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22 return time_left + 1;
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23 end);
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24 return watchdog;
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25 end
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27 function watchdog_methods:reset()
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28 self.last_reset = os_time();
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29 end
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30
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31 function watchdog_methods:cancel()
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32 self.last_reset = nil;
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33 end
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34
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35 return {
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36 new = new;
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37 };