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annotate mod_storage_xmlarchive/README.markdown @ 4565:3b2ae854842c

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mod_muc_bot: Save occupant to room This has some side-effects: Firstly, the bot shows up in occupant list, which is nice. Secondly, the bot starts receiving messages from the room which might be wanted, but it would be better to join the room for real in this case.
author Kim Alvefur <zash@zash.se>
date Sat, 10 Apr 2021 19:23:25 +0200
parents 591c643d55b2
children 100110d539d3
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 - 'Type-Storage'
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5 - ArchiveStorage
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6 summary: XML file based archive storage
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7 ---
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8
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9 Introduction
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10 ============
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11
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12 This module implements stanza archives using files, similar to the
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13 default "internal" storage. Unlike "internal", it saves messages in two
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14 files per day (and per user), one containing metadata and one containing
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15 the actual messages in XML format (hence the name).
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16
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17 Splitting data per day improves performance for larger archives as it
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18 does not have to look through data from other days.
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19
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20 Configuration
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21 =============
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22
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23 To use this with [mod\_mam] add this to your config:
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24
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25 ``` lua
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26 storage = {
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27 archive = "xmlarchive"
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28 }
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29 ```
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30
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31 To use it with [mod\_mam\_muc] or [mod\_http\_muc\_log]:
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33 ``` lua
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34 storage = {
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35 muc_log = "xmlarchive"
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36 }
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37 ```
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38
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39 Refer to [Prosodys data storage documentation][doc:storage] for more
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40 information.
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41
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42 Note that this module does not implement the "keyval" storage method and
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43 can't be used by anything other than archives.
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44
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45 Compatibility
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46 =============
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47
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48 ------ ---------------
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49 trunk Should work
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50 0.11 Works
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51 0.10 Should work
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52 0.9 Does not work
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53 ------ ---------------
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55 Conversion to or from internal storage
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56 --------------------------------------
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57
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58 This module stores data in a way that overlaps with the more recent
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59 archive support in `mod_storage_internal`, meaning e.g. [mod_migrate]
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60 will not be able to cleanly convert to or from the `xmlarchive` format.
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62 To mitigate this, an migration command has been added to
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63 `mod_storage_xmlarchive`:
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65 ``` bash
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66 prosodyctl mod_storage_xmlarchive convert $DIR internal $STORE $JID
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67 ```
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68
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69 Where `$DIR` is `to` or `from`, `$STORE` is e.g. `archive` or `archive2`
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70 for MAM and `muc_log` for MUC logs. Finally, `$JID` is the JID of the
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71 user or MUC room to be migrated, which can be repeated.
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72
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73 ::: {.alert .alert-danger}
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74 Since this is a destructive command, don't forget to backup your data
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75 first.
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76
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77 Prosody should *not* be running while converting data.
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78 :::
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79
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80
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81 Data structure
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82 ==============
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83
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84 Data is split in three kinds of files and messages are grouped by day.
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85 Prosodys `util.datamanager` is used, so all special characters in these
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86 filenames are escaped and reside under `hostname/store` in Prosodys Data
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87 directory, commonly `/var/lib/prosody`.
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88
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89 `username.list`
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90 : A list of dates in `YYYY-MM-DD` format.
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92 `username@YYYY-MM-DD.list`
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93 : Index containing metadata for messages stored on that day.
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94
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95 `username@YYYY-MM-DD.xml`
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96 : Messages in textual XML format, separated by newlines.
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97
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98 This makes it fairly simple and fast to find messages by timestamp.
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99 Queries that are not time based, but limited to a specific contact may
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100 be expensive as potentially the entire archive will be read.
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101
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102 Each archive ID is of the form `YYYY-MM-DD-random`, making lookups by
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103 archive id just as simple as time based queries.
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104
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105 ## Limitations
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106
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107 - Only XML stanzas can be stored.
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108 - The deletion method only supports removing entire days at a time.