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mod_storage_ejabberdsql_readonly: Don't use MySQL-specific syntax util.sql should take care of transformation when MySQL is in use.
author Matthew Wild <mwild1@gmail.com>
date Mon, 30 Oct 2023 12:28:12 +0000
parents ee335399d90e
children
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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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9
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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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16
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17 This module limits the following events:
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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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23
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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 ```lua
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34 Component "conference.example.com" "muc"
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35 modules_enabled = { "muc_limits" }
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36 ```
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37
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38 You can define (globally or per-MUC component) the following options:
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40 Name Default value Description
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41 --------------------------- --------------- ----------------------------------------------------------
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42 muc_event_rate 0.5 The maximum number of events per second.
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43 muc_burst_factor 6 Allow temporary bursts of this multiple.
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44 muc_max_nick_length 23 The maximum allowed length of user nicknames
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45 muc_max_char_count 5664 The maximum allowed number of bytes in a message
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46 muc_max_line_count 23 The maximum allowed number of lines in a message
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47 muc_limit_base_cost 1 Base cost of sending a stanza
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48 muc_line_count_multiplier 0.1 Additional cost of each newline in the body of a message
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50 For more understanding of how these values are used, see the algorithm
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51 section below.
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52
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53 Algorithm
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54 =========
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55
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56 A certain number of events are allowed per second, given by
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57 muc\_event\_rate. An event rate of 1 allows one event per second, and
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58 event rate of 3 allows three events per second, and 0.5 allows one event
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59 every two seconds, and so on.
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61 Obviously MUC conversations are not exactly steady streams of events.
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62 Sometimes multiple people will talk at once. This is handled by the
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63 muc\_burst\_factor option.
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64
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65 A burst factor of 2 will allow 2 times as many events at once, for 2
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66 seconds, before throttling will be triggered. A factor of 5, 5 times as
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67 many events for 5 seconds.
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69 When the limit is reached, an error response will be generated telling
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70 the user the MUC is overactive, and asking them to try again.
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72 Compatibility
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73 =============
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75 ------- -------
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76 trunk Works
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77 0.11 Works
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78 ------- -------