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Remove mod_mam_mnesia 

Include a script and documentation for switching to the MAM module
shipped with ejabberd 15.06 and newer.
This commit is contained in:
Holger Weiss 2016-03-08 00:14:25 +01:00
parent 8c1df80794
commit c9039a5ad2
7 changed files with 167 additions and 1714 deletions
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mod_mam_mnesia/COPYING
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mod_mam_mnesia
==============
Current Status
--------------
_This module is deprecated._
ejabberd 15.06 and newer ships a `mod_mam` module which supports Mnesia
and SQL/ODBC storage. It is recommended to use that module, as
`mod_mam_mnesia` is no longer supported. Existing `mod_mam_mnesia`
tables can be imported into `mod_mam` using the `import-mam-archives`
script, as described below.
Migrating to mod_mam
--------------------
You might want to log off your users during the migration. However,
note that importing the MAM archives might take up to a few hours.
Also note that with `mod_mam`, the total size of all MAM archives cannot
exceed 2 GB. The `delete_old_mam_messages` command could be run
periodically to make sure the Mnesia data won't grow beyond that limit.
To support larger archives, SQL/ODBC storage must be used.
1. In your ejabberd.yml file, replace `mod_mam_mnesia` with `mod_mam`,
and adjust the configuration of that module. `mod_mam` supports a
different set of options, so you should check [the documentation][1].
Since ejabberd 16.02, `mod_mam` supports the
`request_activates_archiving` option, but it's not enabled by
default. To mimic `mod_mam_mnesia`'s default behavior, you could
configure `mod_mam` like this:
modules:
mod_mam:
default: always
request_activates_archiving: true
2. Check the node name of your server by running `ejabberdctl status`.
If the name is _not_ `ejabberd@localhost`, you must replace the
`localhost` part of the two node names at the top of the script
with the host name part of your ejabberd node.
3. The `import-mam-archives` script _removes_ the `mod_mam_mnesia`
tables after importing them into `mod_mam`. Therefore, **you should
take a backup of your MAM archives** (and the other Mnesia data) by
running a command such as:
ejabberdctl dump $HOME/ejabberd-backup.dat
4. [Download][2] and run the import script:
chmod +x import-mam-archives
./import-mam-archives
If only the messages stored during the last `N` days should be
imported, run `./import-mam-archives N` instead.
5. Restart ejabberd.
[1]: https://docs.ejabberd.im/admin/guide/configuration/#modmam
[2]: https://raw.githubusercontent.com/processone/ejabberd-contrib/master/mod_mam_mnesia/import-mam-archives

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mod_mam_mnesia/README.txt
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mod_mam_mnesia - Message Archive Management (XEP-0313)
Author: Holger Weiss <holger@zedat.fu-berlin.de>
Requirements: ejabberd 14.12 or newer
DESCRIPTION
-----------
This module implements XEP-0313: Message Archive Management (MAM). MAM
provides server-side storage of messages, which allows for proper
synchronization of multiple clients.
CONFIGURATION
-------------
In order to use this module with the default settings, add the following
line to the 'modules' section of your ejabberd.yml file:
mod_mam_mnesia: {}
The configurable options are:
- access_max_user_messages (default: 'max_user_mam_messages')
This option defines which access rule is used to limit the maximum number
of MAM messages a user can have. That rule should either yield 0, which
disables MAM storage for the corresponding user(s), or a positive number,
or 'infinity' (which is the default). If the limit is exceeded, the
oldest MAM message is (silently) discarded when a new one is stored.
- default_page_size (default: 25)
If a large set of messages is requested using MAM, the response is split
into smaller chunks ("pages"). The client can optionally specify the
number of messages it would like to receive per page. This option
specifies the number of messages returned if the client doesn't do that.
- max_page_size (default: 100)
This option limits the number of messages transmitted per chunk. If the
client requests larger pages, 'max_page_size' is used instead.
- request_activates_archiving (default: 'true')
By default, message archiving for a given user won't be enabled before one
of his clients issued a MAM request. If message archiving should instead
be activated for all users immediately, set 'request_activates_archiving'
to 'false'.
- iqdisc (default: 'parallel')
The module also supports the 'iqdisc' option, as documented here:
https://www.process-one.net/docs/ejabberd/guide_en.html#modiqdiscoption

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mod_mam_mnesia/conf/mod_mam_mnesia.yml
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modules:
mod_mam_mnesia:
default_page_size: 25
max_page_size: 100

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mod_mam_mnesia/import-mam-archives Executable file
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#!/usr/bin/env escript
%%! -sname import@localhost
% NOTE: If the node name of your server is *not* 'ejabberd@localhost' (see the
% "ejabberdctl status" output), you must change the @localhost part of the node
% names above and below.
-define(NODE, 'ejabberd@localhost').
% Copyright (c) 2016 Holger Weiss <holger@zedat.fu-berlin.de>.
%
% This program is free software; you can redistribute it and/or modify it under
% the terms of the GNU General Public License as published by the Free Software
% Foundation; either version 2 of the License, or (at your option) any later
% version.
%
% This program is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
% FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
% details.
%
% You should have received a copy of the GNU General Public License along with
% this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
% Street, Fifth Floor, Boston, MA 02110-1301 USA.
-record(archive_msg, {us, id, timestamp, peer, bare_peer, packet, nick, type}).
-record(mam_msg, {key, time, route, from, to, stanza}).
usage(IoDevice, ExitStatus) ->
ok = io:put_chars(IoDevice, "Usage: import-mam-archives [days]"),
ok = io:nl(IoDevice),
halt(ExitStatus).
get_timestamp() ->
calendar:datetime_to_gregorian_seconds(calendar:universal_time()).
import(MinTS) ->
TabDef = [{disc_only_copies, [?NODE]},
{type, bag},
{attributes, record_info(fields, archive_msg)}],
rpc:call(?NODE, mnesia, create_table, [archive_msg, TabDef]),
ImportMsg = fun(#mam_msg{key = {{U, S}, ID},
time = TS,
route = Direction,
from = {FromU, FromS, FromR},
to = {ToU, ToS, ToR},
stanza = Msg},
{ok, N}) when MinTS =:= undefined;
TS > MinTS ->
{PeerU, PeerS, PeerR} =
case Direction of
incoming -> {FromU, FromS, FromR};
outgoing -> {ToU, ToS, ToR}
end,
Record = #archive_msg{us = {U, S},
id = integer_to_binary(ID),
timestamp = TS,
peer = {PeerU, PeerS, PeerR},
bare_peer = {PeerU, PeerS, <<>>},
type = chat,
nick = <<>>,
packet = Msg},
case N rem 100 of
0 -> io:put_chars(".");
_ -> ok
end,
{mnesia:write(Record), N + 1};
(#mam_msg{}, {ok, N}) ->
{ok, N}
end,
ImportTab = fun() ->
mnesia:foldl(ImportMsg, {ok, 0}, mam_msg)
end,
Start = get_timestamp(),
io:put_chars("Please wait "),
{ok, N} = rpc:call(?NODE, mnesia, activity,
[sync_dirty, ImportTab, [], mnesia_frag]),
{atomic, ok} = rpc:call(?NODE, mnesia, delete_table, [mam_msg]),
{atomic, ok} = rpc:call(?NODE, mnesia, delete_table, [mam_meta]),
End = get_timestamp(),
io:fwrite("~nImported ~B messages in ~.1f minutes.~n",
[N, (End - Start) / 60]).
main(["-h"]) ->
usage(standard_io, 0);
main([]) ->
import(undefined);
main([Days]) ->
Secs = try
D = list_to_integer(Days),
true = D > 0,
true = D < 10000,
D * 86400
catch
_:_ -> usage(standard_error, 2)
end,
{MS, S, US} = os:timestamp(),
CurS = MS * 1000000 + S,
MinS = CurS - Secs,
import({MinS div 1000000, MinS rem 1000000, US});
main(_Junk) ->
usage(standard_error, 2).

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mod_mam_mnesia/mod_mam_mnesia.spec
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author: "Holger Weiss <holger at zedat.fu-berlin.de>"
category: "archive"
summary: "Message Archive Management (XEP-0313)"
home: "https://github.com/processone/ejabberd-contrib/tree/master/"
url: "git@github.com:processone/ejabberd-contrib.git"

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mod_mam_mnesia/src/mod_mam_mnesia.erl
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