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mod_post_msg/README: Document the payload formats
author Kim Alvefur <zash@zash.se>
date Wed, 04 Apr 2018 15:44:29 +0200
parents 7713cd4fff8f
children a6722a35f35e
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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.
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15 Configuration
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16 =============
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17
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18 To use this with [mod\_mam] add this to your config:
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19
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20 ``` lua
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21 storage = {
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22 archive2 = "xmlarchive"
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23 }
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24 ```
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25
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26 To use it with [mod\_mam\_muc] or [mod\_http\_muc\_log]:
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27
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28 ``` lua
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29 storage = {
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30 muc_log = "xmlarchive"
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31 }
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32 ```
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34 Refer to [Prosodys data storage documentation][doc:storage] for more
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35 information.
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36
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37 Note that this module does not implement the "keyval" storage method and
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38 can't be used by anything other than archives.
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40 Compatibility
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41 =============
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42
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43 ------ ---------------
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44 0.10 Works
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45 0.9 Should work
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46 0.8 Does not work
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47 ------ ---------------
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48
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49 Conversion to or from internal storage
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50 --------------------------------------
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51
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52 This module stores data in a way that overlaps with the more recent
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53 archive support in `mod_storage_internal`, meaning e.g. [mod_migrate]
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54 will not be able to cleanly convert to or from the `xmlarchive` format.
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56 To mitigate this, an migration command has been added to
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57 `mod_storage_xmlarchive`:
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58
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59 ``` bash
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60 prosodyctl mod_storage_xmlarchive convert $DIR internal $STORE $JID
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61 ```
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62
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63 Where `$DIR` is `to` or `from`, `$STORE` is e.g. `archive` or `archive2`
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64 for MAM and `muc_log` for MUC logs. Finally, `$JID` is the JID of the
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65 user or MUC room to be migrated, which can be repeated.
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66
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67 Data structure
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68 ==============
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69
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70 Data is split in three kinds of files and messages are grouped by day.
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71 Prosodys `util.datamanager` is used, so all special characters in these
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72 filenames are escaped and reside under `hostname/store` in Prosodys Data
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73 directory, commonly `/var/lib/prosody`.
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74
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75 `username.list`
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76 : A list of dates in `YYYY-MM-DD` format.
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77
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78 `username@YYYY-MM-DD.list`
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79 : Index containing metadata for messages stored on that day.
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80
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81 `username@YYYY-MM-DD.xml`
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82 : Messages in textual XML format, separated by newlines.
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83
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84 This makes it fairly simple and fast to find messages by timestamp.
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85 Queries that are not time based, but limited to a specific contact may
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86 be expensive as potentially the entire archive will be read.
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87
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88 Each archive ID is of the form `YYYY-MM-DD-random`, making lookups by
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89 archive id just as simple as time based queries.