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%%%---------------------------------------------------------------------- |
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%%% Copyright notice from the originam mod_offline.erl |
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%%% |
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%%% File : mod_offline.erl |
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%%% Author : Alexey Shchepin <alexey@process-one.net> |
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%%% Purpose : Store and manage offline messages in Mnesia database. |
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%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@process-one.net> |
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%%% |
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%%% |
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%%% ejabberd, Copyright (C) 2002-2011 ProcessOne |
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%%% |
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%%% This program is free software; you can redistribute it and/or |
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%%% modify it under the terms of the GNU General Public License as |
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%%% published by the Free Software Foundation; either version 2 of the |
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%%% License, or (at your option) any later version. |
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%%% |
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%%% This program is distributed in the hope that it will be useful, |
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of |
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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%%% General Public License for more details. |
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%%% |
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%%% You should have received a copy of the GNU General Public License |
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%%% along with this program; if not, write to the Free Software |
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%%% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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%%% |
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%%%---------------------------------------------------------------------- |
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-module(mod_offline_mnesia). |
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-behaviour(mod_offline_backend). |
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-export([init/2, |
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pop_messages/2, |
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fetch_messages/2, |
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write_messages/4, |
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count_offline_messages/4, |
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remove_expired_messages/2, |
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remove_old_messages/3, |
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remove_user/3]). |
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-include("mod_offline.hrl"). |
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-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000). |
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-spec init(mongooseim:host_type(), gen_mod:module_opts()) -> ok. |
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init(_HostType, _Opts) -> |
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2 |
mongoose_mnesia:create_table(offline_msg, |
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[{disc_only_copies, [node()]}, {type, bag}, |
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{attributes, record_info(fields, offline_msg)}]), |
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upgrade_table(), |
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ok. |
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|
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-spec pop_messages(mongooseim:host_type(), jid:jid()) -> |
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{ok, [mod_offline:msg()]} | {error, any()}. |
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pop_messages(_HostType, To) -> |
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34 |
US = jid:to_lus(To), |
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F = fun() -> |
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Rs = mnesia:wread({offline_msg, US}), |
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mnesia:delete({offline_msg, US}), |
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Rs |
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end, |
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case mnesia:transaction(F) of |
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{atomic, Rs} -> |
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{ok, Rs}; |
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{aborted, Reason} -> |
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:-( |
{error, Reason} |
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end. |
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|
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-spec fetch_messages(mongooseim:host_type(), jid:jid()) -> |
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{ok, [mod_offline:msg()]} | {error, any()}. |
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fetch_messages(_HostType, To) -> |
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US = jid:to_lus(To), |
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F = fun() -> mnesia:wread({offline_msg, US}) end, |
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case mnesia:transaction(F) of |
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{atomic, Rs} -> |
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{ok, Rs}; |
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{aborted, Reason} -> |
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:-( |
{error, Reason} |
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end. |
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-spec write_messages(mongooseim:host_type(), jid:luser(), jid:lserver(), [mod_offline:msg()]) -> |
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ok | {error, any()}. |
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write_messages(_HostType, _LUser, _LServer, Msgs) -> |
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F = fun() -> write_messages_t(Msgs) end, |
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case mnesia:transaction(F) of |
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{atomic, Result} -> |
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Result; |
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{aborted, Reason} -> |
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:-( |
{error, {aborted, Reason}} |
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end. |
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write_messages_t(Msgs) -> |
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5 |
Len = length(Msgs), |
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write_all_messages_t(Len, Msgs). |
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write_all_messages_t(Len, Msgs) -> |
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case Len >= ?OFFLINE_TABLE_LOCK_THRESHOLD of |
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:-( |
true -> mnesia:write_lock_table(offline_msg); |
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false -> ok |
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end, |
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[mnesia:write(M) || M <- Msgs], |
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ok. |
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-spec count_offline_messages(mongooseim:host_type(), jid:luser(), jid:lserver(), |
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mod_offline:msg_count()) -> |
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mod_offline:msg_count(). |
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count_offline_messages(_HostType, LUser, LServer, _MaxNeeded) -> |
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US = {LUser, LServer}, |
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F = fun () -> |
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Result = mnesia:read(offline_msg, US, read), |
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length(Result) |
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end, |
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case catch mnesia:async_dirty(F) of |
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I when is_integer(I) -> I; |
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:-( |
_ -> 0 |
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end. |
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-spec remove_expired_messages(mongooseim:host_type(), jid:lserver()) -> |
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{ok, mod_offline:msg_count()} | {error, any()}. |
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remove_expired_messages(_HostType, LServer) -> |
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:-( |
TimeStamp = erlang:system_time(microsecond), |
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F = fun() -> |
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mnesia:write_lock_table(offline_msg), |
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mnesia:foldl( |
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fun(Rec, Acc) -> |
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:-( |
Acc + remove_expired_message(LServer, TimeStamp, Rec) |
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end, 0, offline_msg) |
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end, |
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:-( |
case mnesia:transaction(F) of |
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{aborted, Reason} -> |
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:-( |
{error, Reason}; |
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{atomic, Result} -> |
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:-( |
{ok, Result} |
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end. |
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-spec remove_old_messages(mongooseim:host_type(), jid:lserver(), mod_offline:timestamp()) -> |
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{ok, mod_offline:msg_count()} | {error, any()}. |
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remove_old_messages(_HostType, LServer, TimeStamp) -> |
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:-( |
F = fun() -> |
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mnesia:write_lock_table(offline_msg), |
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mnesia:foldl( |
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fun(Rec, Acc) -> |
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Acc + remove_old_message(LServer, TimeStamp, Rec) |
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end, 0, offline_msg) |
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end, |
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:-( |
case mnesia:transaction(F) of |
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{aborted, Reason} -> |
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:-( |
{error, Reason}; |
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{atomic, Result} -> |
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:-( |
{ok, Result} |
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end. |
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remove_expired_message(LServer, TimeStamp, Rec = #offline_msg{us = {_, LServer}}) -> |
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:-( |
case mod_offline:is_expired_message(TimeStamp, Rec) of |
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true -> |
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mnesia:delete_object(Rec), |
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:-( |
1; |
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false -> |
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:-( |
0 |
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end; |
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:-( |
remove_expired_message(_, _, _) -> 0. |
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remove_old_message(LServer, TimeStamp, Rec = #offline_msg{us = {_, LServer}}) -> |
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:-( |
case is_old_message(TimeStamp, Rec) of |
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true -> |
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:-( |
mnesia:delete_object(Rec), |
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1; |
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false -> |
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:-( |
0 |
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end; |
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:-( |
remove_old_message(_, _, _) -> 0. |
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is_old_message(MaxAllowedTimeStamp, #offline_msg{timestamp=TimeStamp}) -> |
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:-( |
TimeStamp < MaxAllowedTimeStamp. |
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-spec remove_user(mongooseim:host_type(), jid:luser(), jid:lserver()) -> ok. |
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remove_user(_HostType, LUser, LServer) -> |
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US = {LUser, LServer}, |
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F = fun() -> |
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mnesia:delete({offline_msg, US}) |
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end, |
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mnesia:transaction(F), |
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ok. |
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upgrade_table() -> |
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Fields = record_info(fields, offline_msg), |
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case mnesia:table_info(offline_msg, attributes) of |
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Fields -> |
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ok; |
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[us, timestamp, expire, from, to, packet] -> %% MongooseIM 3.5.0 and older |
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:-( |
mnesia:transform_table(offline_msg, fun transform_from_3_5_0_to_next/1, Fields) |
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end. |
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transform_from_3_5_0_to_next(Record) -> |
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:-( |
erlang:append_element(Record, []). |