prosody
9a70a543c727
util/watchdog.lua

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util/watchdog.lua @ 11962:9a70a543c727

util.async: Add next-tick configuration Running woken runners in the next iteration of the event loop prevents unexpected recursion, unexpected tracebacks, and is generally more predictable. The pattern is borrowed from util.promise, where we're now doing the same.
author Matthew Wild <mwild1@gmail.com>
date Mon, 29 Nov 2021 14:14:30 +0000
parent 8555:4f0f5b49bb03
child 12545:5059a639f61e
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0ed617f58404 util.watchdog: Watchdog timer library
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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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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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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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31 function watchdog_methods:cancel()
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32 self.last_reset = nil;
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33 end
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35 return {
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36 new = new;
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37 };