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%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2016, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 15 Apr 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(mod_mam_mnesia).
-behaviour(mod_mam).
%% API
-export([init/2, remove_user/2, remove_room/3, delete_old_messages/3,
extended_fields/0, store/7, write_prefs/4, get_prefs/2, select/8]).
-include_lib("stdlib/include/ms_transform.hrl").
-include("jlib.hrl").
-include("logger.hrl").
-include("mod_mam.hrl").
-define(BIN_GREATER_THAN(A, B),
((A > B andalso byte_size(A) == byte_size(B))
orelse byte_size(A) > byte_size(B))).
-define(BIN_LESS_THAN(A, B),
((A < B andalso byte_size(A) == byte_size(B))
orelse byte_size(A) < byte_size(B))).
%%%===================================================================
%%% API
%%%===================================================================
init(_Host, _Opts) ->
mnesia:create_table(archive_msg,
[{disc_only_copies, [node()]},
{type, bag},
{attributes, record_info(fields, archive_msg)}]),
mnesia:create_table(archive_prefs,
[{disc_only_copies, [node()]},
{attributes, record_info(fields, archive_prefs)}]).
remove_user(LUser, LServer) ->
US = {LUser, LServer},
F = fun () ->
mnesia:delete({archive_msg, US}),
mnesia:delete({archive_prefs, US})
end,
mnesia:transaction(F).
remove_room(_LServer, LName, LHost) ->
remove_user(LName, LHost).
delete_old_messages(global, TimeStamp, Type) ->
delete_old_user_messages(mnesia:dirty_first(archive_msg), TimeStamp, Type).
delete_old_user_messages('$end_of_table', _TimeStamp, _Type) ->
ok;
delete_old_user_messages(User, TimeStamp, Type) ->
F = fun() ->
Msgs = mnesia:read(archive_msg, User),
Keep = lists:filter(
fun(#archive_msg{timestamp = MsgTS,
type = MsgType}) ->
MsgTS >= TimeStamp orelse (Type /= all andalso
Type /= MsgType)
end, Msgs),
if length(Keep) < length(Msgs) ->
mnesia:delete({archive_msg, User}),
lists:foreach(fun(Msg) -> mnesia:write(Msg) end, Keep);
true ->
ok
end
end,
case mnesia:transaction(F) of
{atomic, ok} ->
delete_old_user_messages(mnesia:dirty_next(archive_msg, User),
TimeStamp, Type);
{aborted, Err} ->
?ERROR_MSG("Cannot delete old MAM messages: ~s", [Err]),
Err
end.
extended_fields() ->
[].
store(Pkt, _, {LUser, LServer}, Type, Peer, Nick, _Dir) ->
LPeer = {PUser, PServer, _} = jid:tolower(Peer),
TS = p1_time_compat:timestamp(),
ID = jlib:integer_to_binary(now_to_usec(TS)),
F = fun() ->
mnesia:write(#archive_msg{us = {LUser, LServer},
id = ID,
timestamp = TS,
peer = LPeer,
bare_peer = {PUser, PServer, <<>>},
type = Type,
nick = Nick,
packet = Pkt})
end,
case mnesia:transaction(F) of
{atomic, ok} ->
{ok, ID};
{aborted, Err} ->
?ERROR_MSG("Cannot add message to MAM archive of ~s@~s: ~s",
[LUser, LServer, Err]),
Err
end.
write_prefs(_LUser, _LServer, Prefs, _ServerHost) ->
mnesia:dirty_write(Prefs).
get_prefs(LUser, LServer) ->
case mnesia:dirty_read(archive_prefs, {LUser, LServer}) of
[Prefs] ->
{ok, Prefs};
_ ->
error
end.
select(_LServer, JidRequestor,
#jid{luser = LUser, lserver = LServer} = JidArchive,
Start, End, With, RSM, MsgType) ->
MS = make_matchspec(LUser, LServer, Start, End, With),
Msgs = mnesia:dirty_select(archive_msg, MS),
SortedMsgs = lists:keysort(#archive_msg.timestamp, Msgs),
{FilteredMsgs, IsComplete} = filter_by_rsm(SortedMsgs, RSM),
Count = length(Msgs),
{lists:map(
fun(Msg) ->
{Msg#archive_msg.id,
jlib:binary_to_integer(Msg#archive_msg.id),
mod_mam:msg_to_el(Msg, MsgType, JidRequestor, JidArchive)}
end, FilteredMsgs), IsComplete, Count}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
now_to_usec({MSec, Sec, USec}) ->
(MSec*1000000 + Sec)*1000000 + USec.
make_matchspec(LUser, LServer, Start, End, {_, _, <<>>} = With) ->
ets:fun2ms(
fun(#archive_msg{timestamp = TS,
us = US,
bare_peer = BPeer} = Msg)
when Start =< TS, End >= TS,
US == {LUser, LServer},
BPeer == With ->
Msg
end);
make_matchspec(LUser, LServer, Start, End, {_, _, _} = With) ->
ets:fun2ms(
fun(#archive_msg{timestamp = TS,
us = US,
peer = Peer} = Msg)
when Start =< TS, End >= TS,
US == {LUser, LServer},
Peer == With ->
Msg
end);
make_matchspec(LUser, LServer, Start, End, none) ->
ets:fun2ms(
fun(#archive_msg{timestamp = TS,
us = US,
peer = Peer} = Msg)
when Start =< TS, End >= TS,
US == {LUser, LServer} ->
Msg
end).
filter_by_rsm(Msgs, none) ->
{Msgs, true};
filter_by_rsm(_Msgs, #rsm_in{max = Max}) when Max < 0 ->
{[], true};
filter_by_rsm(Msgs, #rsm_in{max = Max, direction = Direction, id = ID}) ->
NewMsgs = case Direction of
aft when ID /= <<"">> ->
lists:filter(
fun(#archive_msg{id = I}) ->
?BIN_GREATER_THAN(I, ID)
end, Msgs);
before when ID /= <<"">> ->
lists:foldl(
fun(#archive_msg{id = I} = Msg, Acc)
when ?BIN_LESS_THAN(I, ID) ->
[Msg|Acc];
(_, Acc) ->
Acc
end, [], Msgs);
before when ID == <<"">> ->
lists:reverse(Msgs);
_ ->
Msgs
end,
filter_by_max(NewMsgs, Max).
filter_by_max(Msgs, undefined) ->
{Msgs, true};
filter_by_max(Msgs, Len) when is_integer(Len), Len >= 0 ->
{lists:sublist(Msgs, Len), length(Msgs) =< Len};
filter_by_max(_Msgs, _Junk) ->
{[], true}.
|
