view mod_storage_xmlarchive/README.markdown @ 5401:c8d04ac200fc

mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents 591c643d55b2
children 100110d539d3
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---
labels:
- 'Stage-Beta'
- 'Type-Storage'
- ArchiveStorage
summary: XML file based archive storage
---

Introduction
============

This module implements stanza archives using files, similar to the
default "internal" storage. Unlike "internal", it saves messages in two
files per day (and per user), one containing metadata and one containing
the actual messages in XML format (hence the name).

Splitting data per day improves performance for larger archives as it
does not have to look through data from other days.

Configuration
=============

To use this with [mod\_mam] add this to your config:

``` lua
storage = {
    archive = "xmlarchive"
}
```

To use it with [mod\_mam\_muc] or [mod\_http\_muc\_log]:

``` lua
storage = {
    muc_log = "xmlarchive"
}
```

Refer to [Prosodys data storage documentation][doc:storage] for more
information.

Note that this module does not implement the "keyval" storage method and
can't be used by anything other than archives.

Compatibility
=============

  ------ ---------------
  trunk  Should work
  0.11   Works
  0.10   Should work
  0.9    Does not work
  ------ ---------------

Conversion to or from internal storage
--------------------------------------

This module stores data in a way that overlaps with the more recent
archive support in `mod_storage_internal`, meaning e.g. [mod_migrate]
will not be able to cleanly convert to or from the `xmlarchive` format.

To mitigate this, an migration command has been added to
`mod_storage_xmlarchive`:

``` bash
prosodyctl mod_storage_xmlarchive convert $DIR internal $STORE $JID
```

Where `$DIR` is `to` or `from`, `$STORE` is e.g. `archive` or `archive2`
for MAM and `muc_log` for MUC logs. Finally, `$JID` is the JID of the
user or MUC room to be migrated, which can be repeated.

::: {.alert .alert-danger}
Since this is a destructive command, don't forget to backup your data
first.

Prosody should *not* be running while converting data.
:::


Data structure
==============

Data is split in three kinds of files and messages are grouped by day.
Prosodys `util.datamanager` is used, so all special characters in these
filenames are escaped and reside under `hostname/store` in Prosodys Data
directory, commonly `/var/lib/prosody`.

`username.list`
:   A list of dates in `YYYY-MM-DD` format.

`username@YYYY-MM-DD.list`
:   Index containing metadata for messages stored on that day.

`username@YYYY-MM-DD.xml`
:   Messages in textual XML format, separated by newlines.

This makes it fairly simple and fast to find messages by timestamp.
Queries that are not time based, but limited to a specific contact may
be expensive as potentially the entire archive will be read.

Each archive ID is of the form `YYYY-MM-DD-random`, making lookups by
archive id just as simple as time based queries.

## Limitations

-   Only XML stanzas can be stored.
-   The deletion method only supports removing entire days at a time.