prosody
d3649ae194ab
util/smqueue.lua

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util/smqueue.lua @ 13556:d3649ae194ab

mod_s2s: Clone queued outgoing stanzas to prevent changes This clone call was lost in 902d25cd0557 Affects e.g. presence broadcasts, where the same stanza is sent many times while mutating the 'to' attribute.
author Kim Alvefur <zash@zash.se>
date Sun, 10 Nov 2024 15:10:26 +0100
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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d10957394a3c util: Prefix module imports with prosody namespace
Kim Alvefur <zash@zash.se>
parents: 12058
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1 local queue = require("prosody.util.queue");
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daced16154fa util.smqueue: Abstract queue with acknowledgements and overflow
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2
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3 local lib = { smqueue = {} }
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5 local smqueue = lib.smqueue;
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6
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7 function smqueue:push(v)
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8 self._head = self._head + 1;
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9
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10 assert(self._queue:push(v));
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11 end
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12
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13 function smqueue:ack(h)
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14 if h < self._tail then
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15 return nil, "tail"
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16 elseif h > self._head then
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17 return nil, "head"
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18 end
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19
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20 local acked = {};
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21 self._tail = h;
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22 local expect = self._head - self._tail;
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23 while expect < self._queue:count() do
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24 local v = self._queue:pop();
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25 if not v then return nil, "pop" end
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26 table.insert(acked, v);
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27 end
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28 return acked
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29 end
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30
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31 function smqueue:count_unacked() return self._head - self._tail end
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32
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33 function smqueue:count_acked() return self._tail end
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34
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35 function smqueue:resumable() return self._queue:count() >= (self._head - self._tail) end
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36
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37 function smqueue:resume() return self._queue:items() end
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38
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39 function smqueue:consume() return self._queue:consume() end
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40
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4860da718e87 util.smqueue: Simplify compat table, fix dependent modules (thanks Martin)
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41 function smqueue:table()
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42 local t = {};
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43 for i, v in self:resume() do t[i] = v; end
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44 return t
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45 end
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46
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47 local function freeze(q) return { head = q._head; tail = q._tail } end
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48
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49 local queue_mt = { __name = "smqueue"; __index = smqueue; __len = smqueue.count_unacked; __freeze = freeze }
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50
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51 function lib.new(size)
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52 assert(size > 0);
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53 return setmetatable({ _head = 0; _tail = 0; _queue = queue.new(size, true) }, queue_mt)
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54 end
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55
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56 return lib