prosody
0a8671f32424
util/throttle.lua

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util/throttle.lua @ 11704:0a8671f32424

mod_s2s: Guard against missing 'to' on incoming stream Given an incoming <stream:stream from="example.com"> this line would have mistakenly reported the 'from' as the local host. Neither are technically required and may be missing, especially on connections used only for Dialback. Outgoing connections initiated by Prosody always have 'from_host' and 'to_host', so it is safer to check it this way.
author Kim Alvefur <zash@zash.se>
date Sun, 18 Jul 2021 09:08:04 +0200
parent 8555:4f0f5b49bb03
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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851885cb332d util.throttle: Generic module by waqas to limit something over some time
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1
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2 local gettime = require "util.time".now
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3 local setmetatable = setmetatable;
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5 local _ENV = nil;
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6 -- luacheck: std none
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8 local throttle = {};
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9 local throttle_mt = { __index = throttle };
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11 function throttle:update()
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12 local newt = gettime();
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13 local elapsed = newt - self.t;
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14 self.t = newt;
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15 local balance = (self.rate * elapsed) + self.balance;
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16 if balance > self.max then
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17 self.balance = self.max;
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18 else
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19 self.balance = balance;
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20 end
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21 return self.balance;
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22 end
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24 function throttle:peek(cost)
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25 cost = cost or 1;
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26 return self.balance >= cost or self:update() >= cost;
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27 end
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29 function throttle:poll(cost, split)
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30 if self:peek(cost) then
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31 self.balance = self.balance - cost;
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32 return true;
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33 else
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34 local balance = self.balance;
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35 if split then
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36 self.balance = 0;
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37 end
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38 return false, balance, (cost-balance);
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39 end
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40 end
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41
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42 local function create(max, period)
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43 return setmetatable({ rate = max / period, max = max, t = gettime(), balance = max }, throttle_mt);
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44 end
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45
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46 return {
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47 create = create;
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48 };