annotate mod_storage_xmlarchive/README.markdown @ 4688:05725276fac0

mod_bookmarks2: Use same default as mod_pep for max_items Should fix the issue with max items until the proper "max" can be used, by following the configured max. While "max" is already in trunk, it's not easily usable in 0.11.x This limit and option was added to mod_pep in Prosody rev aefb96a52f5f
author Kim Alvefur <zash@zash.se>
date Wed, 15 Sep 2021 17:39:37 +0200
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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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32
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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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64
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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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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.