prosody
902d25cd0557
util/throttle.lua

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util/throttle.lua @ 13554:902d25cd0557

mod_s2s: Limit size of outgoing stanza queue This queue is used to buffer stanzas while waiting for an outgoing s2s connection to be established. Limit it to prevent excessive memory usage. Default chosen to approximate how many average stanzas fits in the server_epoll default max_send_buffer_size of 32 MiB Returns a custom error instead of the default core.stanza_router "Communication with remote domains is not enabled" from is sent back, which does not describe what is happening here. Closes #1106
author Kim Alvefur <zash@zash.se>
date Sat, 09 Nov 2024 16:47:14 +0100
parent 12975:d10957394a3c
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1
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2 local gettime = require "prosody.util.time".now
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3 local setmetatable = setmetatable;
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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 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 };