annotate mod_storage_xmlarchive/README.markdown @ 4249:64aa1d9d70ac

mod_rest: Catch and log errors in callback promise chain From the code it looks like it should be possible to reply to an error stanza, but it did not. Turns out I was saved by my local developer mode module which throws errors if an attempt is made to create an errror reply to an error stanza. However nothing collects this error from the promise, so all I got was confusion.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Nov 2020 16:25:49 +0100
parents dddcf094af5c
children 591c643d55b2
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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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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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23 To use this with [mod\_mam] add this to your config:
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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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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 Works
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52 0.9 Should work
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53 0.8 Does not work
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54 ------ ---------------
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56 Conversion to or from internal storage
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57 --------------------------------------
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59 This module stores data in a way that overlaps with the more recent
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60 archive support in `mod_storage_internal`, meaning e.g. [mod_migrate]
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61 will not be able to cleanly convert to or from the `xmlarchive` format.
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63 To mitigate this, an migration command has been added to
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64 `mod_storage_xmlarchive`:
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66 ``` bash
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67 prosodyctl mod_storage_xmlarchive convert $DIR internal $STORE $JID
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68 ```
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69
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70 Where `$DIR` is `to` or `from`, `$STORE` is e.g. `archive` or `archive2`
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71 for MAM and `muc_log` for MUC logs. Finally, `$JID` is the JID of the
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72 user or MUC room to be migrated, which can be repeated.
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73
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74 ::: {.alert .alert-danger}
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75 Since this is a destructive command, don't forget to backup your data
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76 first.
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78 Prosody should *not* be running while converting data.
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79 :::
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81
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82 Data structure
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83 ==============
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84
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85 Data is split in three kinds of files and messages are grouped by day.
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86 Prosodys `util.datamanager` is used, so all special characters in these
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87 filenames are escaped and reside under `hostname/store` in Prosodys Data
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88 directory, commonly `/var/lib/prosody`.
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89
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90 `username.list`
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91 : A list of dates in `YYYY-MM-DD` format.
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92
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93 `username@YYYY-MM-DD.list`
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94 : Index containing metadata for messages stored on that day.
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95
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96 `username@YYYY-MM-DD.xml`
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97 : Messages in textual XML format, separated by newlines.
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98
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99 This makes it fairly simple and fast to find messages by timestamp.
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100 Queries that are not time based, but limited to a specific contact may
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101 be expensive as potentially the entire archive will be read.
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102
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103 Each archive ID is of the form `YYYY-MM-DD-random`, making lookups by
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104 archive id just as simple as time based queries.
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105
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106 ## Limitations
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107
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108 - Only XML stanzas can be stored.
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109 - The deletion method only supports removing entire days at a time.