Mercurial > prosody-modules
annotate mod_muc_limits/README.markdown @ 2436:a01a3fb96302
mod_measure_memory: Module is global, no need for a global hook
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 06 Jan 2017 17:07:01 +0100 |
parents | 52e998bb4490 |
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1 --- |
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2 labels: |
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3 - 'Stage-Beta' |
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4 summary: 'Impose rate-limits on a MUC' |
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5 ... |
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7 Introduction |
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8 ============ |
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10 This module allows you to control the maximum rate of 'events' in a MUC |
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11 room. This makes it useful to prevent room floods (whether malicious or |
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12 accidental). |
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14 Details |
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15 ======= |
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17 This module limits the following events: | |
18 | |
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19 - Room joins |
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20 - Nick changes |
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21 - Status changes |
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22 - Messages (including private messages) |
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24 The limit is for the room as a whole, not individual occupants in the |
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25 room. Users with an affiliation (members, admins and owners) are not |
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26 limited. |
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28 Configuration |
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29 ============= |
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30 |
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31 Add the module to the MUC host (not the global modules\_enabled): |
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32 |
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33 Component "conference.example.com" "muc" |
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34 modules_enabled = { "muc_limits" } |
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36 You can define (globally or per-MUC component) the following options: | |
37 | |
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38 Name Default value Description |
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39 -------------------- --------------- ------------------------------------------ |
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40 muc\_event\_rate 0.5 The maximum number of events per second. |
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41 muc\_burst\_factor 6 Allow temporary bursts of this multiple. |
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42 |
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43 For more understanding of how these values are used, see the algorithm |
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44 section below. |
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46 Algorithm |
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47 ========= |
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49 A certain number of events are allowed per second, given by |
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50 muc\_event\_rate. An event rate of 1 allows one event per second, and |
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51 event rate of 3 allows three events per second, and 0.5 allows one event |
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52 every two seconds, and so on. |
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54 Obviously MUC conversations are not exactly steady streams of events. |
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55 Sometimes multiple people will talk at once. This is handled by the |
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56 muc\_burst\_factor option. |
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58 A burst factor of 2 will allow 2 times as many events at once, for 2 |
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59 seconds, before throttling will be triggered. A factor of 5, 5 times as |
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60 many events for 5 seconds. |
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62 When the limit is reached, an error response will be generated telling |
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63 the user the MUC is overactive, and asking them to try again. |
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65 Compatibility |
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66 ============= |
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68 ------- ------------------ |
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69 Trunk Works |
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70 0.8 Doesn't work[^1] |
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71 ------- ------------------ |
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73 [^1]: This module can be made to work in 0.8 (and *maybe* previous |
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74 versions) of Prosody by copying the new |
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75 [util.throttle](http://hg.prosody.im/trunk/raw-file/fc8a22936b3c/util/throttle.lua) |
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76 into your Prosody source directory (into the util/ subdirectory). |