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%%%----------------------------------------------------------------------
%%% File : yaws_mnesia_session.erl
%%% Author : Nicolas Thauvin <nicolas@corporama.com>
%%% Purpose : mnesia storage callbacks for yaws_session_server
%%%----------------------------------------------------------------------
%% Warning !!!
%% This module may init mnesia in a way that is not suitable for your
%% application !
%% Quick steps:
%% 1) Compile this module
%% 2) Drop the .beam in your code path
%% 3) Run Yaws with the
-module (yaws_mnesia_session).
-export ([init_backend/1, stop_backend/0]).
-export ([list/0, insert/1, lookup/1, delete/1]).
-export ([traverse/1, cleanup/0]).
-define(TABLE, ysession).
init_backend(Fields) ->
case net_kernel:get_net_ticktime() of
ignored ->
Message = "mnesia backend needs distribution (a node name)",
Error = {?MODULE, Message},
error_logger:error_msg("~p~n", [Error]),
exit (Error);
_ ->
ok
end,
case catch mnesia:table_info(schema, where_to_write) of
Nodes when is_list(Nodes) ->
case catch mnesia:table_info(?TABLE, where_to_write) of
{'EXIT', {aborted, {no_exists, ?TABLE, where_to_write}}} ->
Nodes = mnesia:system_info(running_db_nodes),
Options = [{disc_copies, Nodes}, {type, set},
{attributes, Fields}],
{atomic, ok} = mnesia: create_table (?TABLE, Options),
ok;
List when is_list (List) ->
ok = mnesia:wait_for_tables([?TABLE], 60000)
end;
{'EXIT',{aborted,{no_exists,schema,where_to_write}}} ->
application:stop(mnesia),
mnesia:create_schema([node()]),
ok = application:start(mnesia),
init_backend(Fields)
end.
stop_backend() ->
ok.
insert(Session) ->
Fun = fun () -> mnesia:write(Session) end,
{atomic, ok} = mnesia:transaction(Fun),
true.
lookup(Key) ->
Fun = fun () -> mnesia:read(?TABLE, Key) end,
{atomic, Result} = mnesia:transaction(Fun),
Result.
delete(Key) ->
Fun = fun () -> mnesia:delete({?TABLE, Key}) end,
{atomic, Result} = mnesia:transaction(Fun),
Result.
list() ->
Fold = fun (Session, Acc) -> [Session | Acc] end,
Fun = fun () -> mnesia:foldl(Fold, [], ?TABLE) end,
{atomic, Result} = mnesia:transaction(Fun),
Result.
cleanup() ->
mnesia:clear_table(?TABLE).
traverse(Gnow) ->
Fun = fun() -> tr_traverse(Gnow) end,
{atomic, Result} = mnesia:transaction(Fun),
Result.
tr_traverse(Gnow) ->
tr_traverse(Gnow, mnesia:first(?TABLE)).
tr_traverse(_N, '$end_of_table') ->
ok;
tr_traverse(N, Key) ->
case mnesia:read(?TABLE, Key) of
[Y] ->
case yaws_session_server:has_timedout(Y, N) of
false ->
tr_traverse(N, mnesia:next(?TABLE, Key));
true ->
yaws_session_server:report_timedout_sess(Y),
Next = mnesia:next(?TABLE, Key),
mnesia:delete({?TABLE, Key}),
tr_traverse(N, Next)
end;
[] ->
tr_traverse(N, mnesia:next(?MODULE, Key))
end.
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