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mod_storage_xmlarchive: Expand description in README
author Kim Alvefur <zash@zash.se>
date Sun, 06 Jan 2019 10:27:16 +0100
parent 2855:7713cd4fff8f
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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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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 archive2 = "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 0.10 Works
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50 0.9 Should work
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51 0.8 Does not work
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52 ------ ---------------
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54 Conversion to or from internal storage
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55 --------------------------------------
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56
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57 This module stores data in a way that overlaps with the more recent
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58 archive support in `mod_storage_internal`, meaning e.g. [mod_migrate]
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59 will not be able to cleanly convert to or from the `xmlarchive` format.
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60
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61 To mitigate this, an migration command has been added to
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62 `mod_storage_xmlarchive`:
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63
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64 ``` bash
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65 prosodyctl mod_storage_xmlarchive convert $DIR internal $STORE $JID
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66 ```
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67
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68 Where `$DIR` is `to` or `from`, `$STORE` is e.g. `archive` or `archive2`
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69 for MAM and `muc_log` for MUC logs. Finally, `$JID` is the JID of the
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70 user or MUC room to be migrated, which can be repeated.
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71
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72 Data structure
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73 ==============
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74
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75 Data is split in three kinds of files and messages are grouped by day.
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76 Prosodys `util.datamanager` is used, so all special characters in these
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77 filenames are escaped and reside under `hostname/store` in Prosodys Data
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78 directory, commonly `/var/lib/prosody`.
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79
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80 `username.list`
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81 : A list of dates in `YYYY-MM-DD` format.
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82
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83 `username@YYYY-MM-DD.list`
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84 : Index containing metadata for messages stored on that day.
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85
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86 `username@YYYY-MM-DD.xml`
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87 : Messages in textual XML format, separated by newlines.
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88
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89 This makes it fairly simple and fast to find messages by timestamp.
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90 Queries that are not time based, but limited to a specific contact may
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91 be expensive as potentially the entire archive will be read.
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92
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93 Each archive ID is of the form `YYYY-MM-DD-random`, making lookups by
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94 archive id just as simple as time based queries.
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95
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96 ## Limitations
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97
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98 - Only XML stanzas can be stored.
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99 - The deletion method only supports removing entire days at a time.