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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_offline_mnesia).
-behaviour(mod_offline).
-export([init/2, store_messages/5, pop_messages/2, remove_expired_messages/1,
remove_old_messages/2, remove_user/2, read_message_headers/2,
read_message/3, remove_message/3, read_all_messages/2,
remove_all_messages/2, count_messages/2, import/2]).
-include("jlib.hrl").
-include("mod_offline.hrl").
-include("logger.hrl").
-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
%%%===================================================================
%%% API
%%%===================================================================
init(_Host, _Opts) ->
mnesia:create_table(offline_msg,
[{disc_only_copies, [node()]}, {type, bag},
{attributes, record_info(fields, offline_msg)}]),
update_table().
store_messages(_Host, US, Msgs, Len, MaxOfflineMsgs) ->
F = fun () ->
Count = if MaxOfflineMsgs =/= infinity ->
Len + count_mnesia_records(US);
true -> 0
end,
if Count > MaxOfflineMsgs -> discard;
true ->
if Len >= (?OFFLINE_TABLE_LOCK_THRESHOLD) ->
mnesia:write_lock_table(offline_msg);
true -> ok
end,
lists:foreach(fun (M) -> mnesia:write(M) end, Msgs)
end
end,
mnesia:transaction(F).
pop_messages(LUser, LServer) ->
US = {LUser, LServer},
F = fun () ->
Rs = mnesia:wread({offline_msg, US}),
mnesia:delete({offline_msg, US}),
Rs
end,
case mnesia:transaction(F) of
{atomic, L} ->
{ok, lists:keysort(#offline_msg.timestamp, L)};
{aborted, Reason} ->
{error, Reason}
end.
remove_expired_messages(_LServer) ->
TimeStamp = p1_time_compat:timestamp(),
F = fun () ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(fun (Rec, _Acc) ->
case Rec#offline_msg.expire of
never -> ok;
TS ->
if TS < TimeStamp ->
mnesia:delete_object(Rec);
true -> ok
end
end
end,
ok, offline_msg)
end,
mnesia:transaction(F).
remove_old_messages(Days, _LServer) ->
S = p1_time_compat:system_time(seconds) - 60 * 60 * 24 * Days,
MegaSecs1 = S div 1000000,
Secs1 = S rem 1000000,
TimeStamp = {MegaSecs1, Secs1, 0},
F = fun () ->
mnesia:write_lock_table(offline_msg),
mnesia:foldl(fun (#offline_msg{timestamp = TS} = Rec,
_Acc)
when TS < TimeStamp ->
mnesia:delete_object(Rec);
(_Rec, _Acc) -> ok
end,
ok, offline_msg)
end,
mnesia:transaction(F).
remove_user(LUser, LServer) ->
US = {LUser, LServer},
F = fun () -> mnesia:delete({offline_msg, US}) end,
mnesia:transaction(F).
read_message_headers(LUser, LServer) ->
Msgs = mnesia:dirty_read({offline_msg, {LUser, LServer}}),
Hdrs = lists:map(
fun(#offline_msg{from = From, to = To, packet = Pkt,
timestamp = TS}) ->
Seq = now_to_integer(TS),
NewPkt = jlib:add_delay_info(Pkt, LServer, TS,
<<"Offline Storage">>),
{Seq, From, To, NewPkt}
end, Msgs),
lists:keysort(1, Hdrs).
read_message(LUser, LServer, I) ->
US = {LUser, LServer},
TS = integer_to_now(I),
case mnesia:dirty_match_object(
offline_msg, #offline_msg{us = US, timestamp = TS, _ = '_'}) of
[Msg|_] ->
{ok, Msg};
_ ->
error
end.
remove_message(LUser, LServer, I) ->
US = {LUser, LServer},
TS = integer_to_now(I),
Msgs = mnesia:dirty_match_object(
offline_msg, #offline_msg{us = US, timestamp = TS, _ = '_'}),
lists:foreach(
fun(Msg) ->
mnesia:dirty_delete_object(Msg)
end, Msgs).
read_all_messages(LUser, LServer) ->
US = {LUser, LServer},
lists:keysort(#offline_msg.timestamp,
mnesia:dirty_read({offline_msg, US})).
remove_all_messages(LUser, LServer) ->
US = {LUser, LServer},
F = fun () ->
mnesia:write_lock_table(offline_msg),
lists:foreach(fun (Msg) -> mnesia:delete_object(Msg) end,
mnesia:dirty_read({offline_msg, US}))
end,
mnesia:transaction(F).
count_messages(LUser, LServer) ->
US = {LUser, LServer},
F = fun () ->
count_mnesia_records(US)
end,
case catch mnesia:async_dirty(F) of
I when is_integer(I) -> I;
_ -> 0
end.
import(_LServer, #offline_msg{} = Msg) ->
mnesia:dirty_write(Msg).
%%%===================================================================
%%% Internal functions
%%%===================================================================
%% Return the number of records matching a given match expression.
%% This function is intended to be used inside a Mnesia transaction.
%% The count has been written to use the fewest possible memory by
%% getting the record by small increment and by using continuation.
-define(BATCHSIZE, 100).
count_mnesia_records(US) ->
MatchExpression = #offline_msg{us = US, _ = '_'},
case mnesia:select(offline_msg, [{MatchExpression, [], [[]]}],
?BATCHSIZE, read) of
{Result, Cont} ->
Count = length(Result),
count_records_cont(Cont, Count);
'$end_of_table' ->
0
end.
count_records_cont(Cont, Count) ->
case mnesia:select(Cont) of
{Result, Cont} ->
NewCount = Count + length(Result),
count_records_cont(Cont, NewCount);
'$end_of_table' ->
Count
end.
jid_to_binary(#jid{user = U, server = S, resource = R,
luser = LU, lserver = LS, lresource = LR}) ->
#jid{user = iolist_to_binary(U),
server = iolist_to_binary(S),
resource = iolist_to_binary(R),
luser = iolist_to_binary(LU),
lserver = iolist_to_binary(LS),
lresource = iolist_to_binary(LR)}.
now_to_integer({MS, S, US}) ->
(MS * 1000000 + S) * 1000000 + US.
integer_to_now(Int) ->
Secs = Int div 1000000,
USec = Int rem 1000000,
MSec = Secs div 1000000,
Sec = Secs rem 1000000,
{MSec, Sec, USec}.
update_table() ->
Fields = record_info(fields, offline_msg),
case mnesia:table_info(offline_msg, attributes) of
Fields ->
ejabberd_config:convert_table_to_binary(
offline_msg, Fields, bag,
fun(#offline_msg{us = {U, _}}) -> U end,
fun(#offline_msg{us = {U, S},
from = From,
to = To,
packet = El} = R) ->
R#offline_msg{us = {iolist_to_binary(U),
iolist_to_binary(S)},
from = jid_to_binary(From),
to = jid_to_binary(To),
packet = fxml:to_xmlel(El)}
end);
_ ->
?INFO_MSG("Recreating offline_msg table", []),
mnesia:transform_table(offline_msg, ignore, Fields)
end.
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