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1 #summary Impose rate-limits on a MUC |
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2 #labels Stage-Beta |
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3 |
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4 = Introduction = |
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5 |
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6 This module allows you to control the maximum rate of 'events' in a MUC room. This makes it useful to prevent room floods (whether malicious or accidental). |
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7 |
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8 = Details = |
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9 |
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10 This module limits the following events: |
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11 |
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12 * Room joins |
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13 * Nick changes |
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14 * Status changes |
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15 * Messages (including private messages) |
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16 |
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17 The limit is for the room as a whole, not individual occupants in the room. Users with an affiliation (members, admins and owners) are not limited. |
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18 |
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19 = Configuration = |
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20 |
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21 Add the module to the MUC host (not the global modules_enabled): |
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22 |
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23 {{{ |
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24 Component "conference.example.com" "muc" |
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25 modules_enabled = { "muc_limits" } |
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26 }}} |
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27 |
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28 You can define (globally or per-MUC component) the following options: |
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29 |
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30 || *Name* || *Default value* || *Description* || |
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31 || muc_event_rate || 0.5 || The maximum number of events per second. || |
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32 || muc_burst_factor || 6 || Allow temporary bursts of this multiple. || |
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33 |
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34 For more understanding of how these values are used, see the algorithm section below. |
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35 |
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36 = Algorithm = |
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37 |
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38 A certain number of events are allowed per second, given by muc_event_rate. An event rate of 1 allows one event per second, and event rate of 3 allows three events per second, and 0.5 allows one event every two seconds, and so on. |
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39 |
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40 Obviously MUC conversations are not exactly steady streams of events. Sometimes multiple people will talk at once. This is handled by the muc_burst_factor option. |
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41 |
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42 A burst factor of 2 will allow 2 times as many events at once, for 2 seconds, before throttling will be triggered. A factor of 5, 5 times as many events for 5 seconds. |
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43 |
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44 When the limit is reached, an error response will be generated telling the user the MUC is overactive, and asking them to try again. |
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45 |
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46 = Compatibility = |
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47 || Trunk || Works || |
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48 || 0.8 || Doesn't work`*` || |
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49 |
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50 `*` This module can be made to work in 0.8 (and _maybe_ previous versions) of Prosody by copying the new [http://hg.prosody.im/trunk/raw-file/fc8a22936b3c/util/throttle.lua util.throttle] into your Prosody source directory (into the util/ subdirectory). |
