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-module(mod_muc_online_mnesia). |
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-behaviour(mod_muc_online_backend). |
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-export([start/2, |
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stop/1, |
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register_room/4, |
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room_destroyed/4, |
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find_room_pid/3, |
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get_online_rooms/2, |
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node_cleanup/2, |
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clear_table/1]). |
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-include_lib("mod_muc.hrl"). |
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-spec start(mongooseim:host_type(), gen_mod:module_opts()) -> ok. |
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start(_HostType, _Opts) -> |
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:-( |
mongoose_mnesia:create_table(muc_online_room, |
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[{ram_copies, [node()]}, |
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{attributes, record_info(fields, muc_online_room)}]), |
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:-( |
ok. |
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-spec stop(mongooseim:host_type()) -> ok. |
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:-( |
stop(_HostType) -> ok. |
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-spec register_room( |
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HostType :: mongooseim:host_type(), |
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MucHost :: jid:lserver(), |
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Room :: mod_muc:room(), |
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Pid :: pid()) -> ok | {exists, pid()} | {error, term()}. |
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register_room(HostType, MucHost, Room, Pid) -> |
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:-( |
F = fun() -> |
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:-( |
case mnesia:read(muc_online_room, {Room, MucHost}, write) of |
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[] -> |
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:-( |
mnesia:write(#muc_online_room{name_host = {Room, MucHost}, |
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host_type = HostType, |
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pid = Pid}); |
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[R] -> |
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:-( |
{exists, R#muc_online_room.pid} |
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end |
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end, |
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:-( |
simple_transaction_result(mnesia:transaction(F)). |
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%% Race condition is possible between register and room_destroyed |
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%% (Because register is outside of the room process) |
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-spec room_destroyed(mongooseim:host_type(), jid:lserver(), mod_muc:room(), pid()) -> ok. |
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room_destroyed(HostType, MucHost, Room, Pid) -> |
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:-( |
Obj = #muc_online_room{name_host = {Room, MucHost}, |
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host_type = HostType, pid = Pid}, |
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:-( |
F = fun() -> mnesia:delete_object(Obj) end, |
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:-( |
{atomic, ok} = mnesia:transaction(F), |
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:-( |
ok. |
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simple_transaction_result({atomic, Res}) -> |
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:-( |
Res; |
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simple_transaction_result({aborted, Reason}) -> |
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:-( |
{error, Reason}. |
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-spec find_room_pid(mongooseim:host_type(), jid:server(), mod_muc:room()) -> |
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{ok, pid()} | {error, not_found}. |
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find_room_pid(_HostType, MucHost, Room) -> |
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:-( |
case mnesia:dirty_read(muc_online_room, {Room, MucHost}) of |
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[R] -> |
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:-( |
{ok, R#muc_online_room.pid}; |
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[] -> |
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:-( |
{error, not_found} |
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end. |
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-spec get_online_rooms(mongooseim:host_type(), jid:lserver()) -> |
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[mod_muc:muc_online_room()]. |
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get_online_rooms(_HostType, MucHost) -> |
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:-( |
mnesia:dirty_select(muc_online_room, |
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[{#muc_online_room{name_host = '$1', _ = '_'}, |
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[{'==', {element, 2, '$1'}, MucHost}], |
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['$_']}]). |
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-spec node_cleanup(mongooseim:host_type(), node()) -> ok. |
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node_cleanup(HostType, Node) -> |
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:-( |
F = fun() -> |
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:-( |
Es = mnesia:select( |
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muc_online_room, |
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[{#muc_online_room{pid = '$1', |
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host_type = HostType, |
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_ = '_'}, |
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[{'==', {node, '$1'}, Node}], |
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['$_']}]), |
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:-( |
lists:foreach(fun(E) -> |
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:-( |
mnesia:delete_object(E) |
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end, Es) |
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end, |
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:-( |
mnesia:async_dirty(F), |
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:-( |
ok. |
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%% Clear table for tests |
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-spec clear_table(mongooseim:host_type()) -> ok. |
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clear_table(_HostType) -> |
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:-( |
mnesia:clear_table(muc_online_room), |
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:-( |
ok. |