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|
%%%----------------------------------------------------------------------
%%% File : ejd2sql.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Export some mnesia tables to SQL DB
%%% Created : 22 Aug 2005 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2016 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejd2sql).
-author('alexey@process-one.net').
-include("logger.hrl").
-export([export/2, export/3, import_file/2, import/2,
import/3, delete/1]).
-define(MAX_RECORDS_PER_TRANSACTION, 100).
-record(dump, {fd, cont = start}).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
%%% How to use:
%%% A table can be converted from Mnesia to an ODBC database by calling
%%% one of the API function with the following parameters:
%%% - Server is the server domain you want to convert
%%% - Output can be either sql to export to the configured relational
%%% database or "Filename" to export to text file.
modules() ->
[ejabberd_auth,
mod_announce,
mod_irc,
mod_last,
mod_muc,
mod_offline,
mod_privacy,
mod_private,
%% mod_pubsub,
mod_roster,
mod_shared_roster,
mod_vcard,
mod_vcard_xupdate].
export(Server, Output) ->
LServer = jid:nameprep(iolist_to_binary(Server)),
Modules = modules(),
IO = prepare_output(Output),
lists:foreach(
fun(Module) ->
export(LServer, IO, Module)
end, Modules),
close_output(Output, IO).
export(Server, Output, Module) ->
LServer = jid:nameprep(iolist_to_binary(Server)),
IO = prepare_output(Output),
lists:foreach(
fun({Table, ConvertFun}) ->
export(LServer, Table, IO, ConvertFun)
end, Module:export(Server)),
close_output(Output, IO).
delete(Server) ->
Modules = modules(),
lists:foreach(
fun(Module) ->
delete(Server, Module)
end, Modules).
delete(Server, Module) ->
LServer = jid:nameprep(iolist_to_binary(Server)),
lists:foreach(
fun({Table, ConvertFun}) ->
delete(LServer, Table, ConvertFun)
end, Module:export(Server)).
import_file(Server, FileName) when is_binary(FileName) ->
import(Server, binary_to_list(FileName));
import_file(Server, FileName) ->
case disk_log:open([{name, make_ref()},
{file, FileName},
{mode, read_only}]) of
{ok, Fd} ->
LServer = jid:nameprep(Server),
Mods = [{Mod, gen_mod:db_type(LServer, Mod)}
|| Mod <- modules(), gen_mod:is_loaded(LServer, Mod)],
AuthMods = case lists:member(ejabberd_auth_mnesia,
ejabberd_auth:auth_modules(LServer)) of
true ->
[{ejabberd_auth, mnesia}];
false ->
[]
end,
import_dump(LServer, AuthMods ++ Mods, #dump{fd = Fd});
Err ->
exit(Err)
end.
import(Server, Output) ->
import(Server, Output, [{fast, true}]).
import(Server, Output, Opts) ->
LServer = jid:nameprep(iolist_to_binary(Server)),
Modules = modules(),
IO = prepare_output(Output, disk_log),
lists:foreach(
fun(Module) ->
import(LServer, IO, Opts, Module)
end, Modules),
close_output(Output, IO).
import(Server, Output, Opts, Module) ->
LServer = jid:nameprep(iolist_to_binary(Server)),
IO = prepare_output(Output, disk_log),
lists:foreach(
fun({SelectQuery, ConvertFun}) ->
import(LServer, SelectQuery, IO, ConvertFun, Opts)
end, Module:import(Server)),
close_output(Output, IO).
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
export(LServer, Table, IO, ConvertFun) ->
F = fun () ->
mnesia:read_lock_table(Table),
{_N, SQLs} =
mnesia:foldl(
fun(R, {N, SQLs} = Acc) ->
case ConvertFun(LServer, R) of
[] ->
Acc;
SQL ->
if N < (?MAX_RECORDS_PER_TRANSACTION) - 1 ->
{N + 1, [SQL | SQLs]};
true ->
output(LServer,
Table, IO,
flatten([SQL | SQLs])),
{0, []}
end
end
end,
{0, []}, Table),
output(LServer, Table, IO, flatten(SQLs))
end,
mnesia:transaction(F).
output(_LServer, _Table, _IO, []) ->
ok;
output(LServer, _Table, sql, SQLs) ->
ejabberd_sql:sql_transaction(LServer, SQLs);
output(_LServer, Table, Fd, SQLs) ->
file:write(Fd, ["-- \n-- Mnesia table: ", atom_to_list(Table),
"\n--\n", SQLs]).
delete(LServer, Table, ConvertFun) ->
F = fun () ->
mnesia:write_lock_table(Table),
{_N, SQLs} =
mnesia:foldl(
fun(R, {N, SQLs} = Acc) ->
case ConvertFun(LServer, R) of
[] ->
Acc;
_SQL ->
mnesia:delete_object(R),
Acc
end
end,
{0, []}, Table),
delete(LServer, Table, SQLs)
end,
mnesia:transaction(F).
import(LServer, SelectQuery, IO, ConvertFun, Opts) ->
F = case proplists:get_bool(fast, Opts) of
true ->
fun() ->
case ejabberd_sql:sql_query_t(SelectQuery) of
{selected, _, Rows} ->
lists:foldl(fun process_sql_row/2,
{IO, ConvertFun, undefined}, Rows);
Err ->
erlang:error(Err)
end
end;
false ->
fun() ->
ejabberd_sql:sql_query_t(
[iolist_to_binary(
[<<"declare c cursor for ">>, SelectQuery])]),
fetch(IO, ConvertFun, undefined)
end
end,
ejabberd_sql:sql_transaction(LServer, F).
fetch(IO, ConvertFun, PrevRow) ->
case ejabberd_sql:sql_query_t([<<"fetch c;">>]) of
{selected, _, [Row]} ->
process_sql_row(Row, {IO, ConvertFun, PrevRow}),
fetch(IO, ConvertFun, Row);
{selected, _, []} ->
ok;
Err ->
erlang:error(Err)
end.
process_sql_row(Row, {IO, ConvertFun, PrevRow}) when Row == PrevRow ->
%% Avoid calling ConvertFun with the same input
{IO, ConvertFun, Row};
process_sql_row(Row, {IO, ConvertFun, _PrevRow}) ->
case catch ConvertFun(Row) of
{'EXIT', _} = Err ->
?ERROR_MSG("failed to convert ~p: ~p", [Row, Err]);
Term ->
ok = disk_log:log(IO#dump.fd, Term)
end,
{IO, ConvertFun, Row}.
import_dump(LServer, Mods, #dump{fd = Fd, cont = Cont}) ->
case disk_log:chunk(Fd, Cont) of
{NewCont, Terms} ->
import_terms(LServer, Mods, Terms),
import_dump(LServer, Mods, #dump{fd = Fd, cont = NewCont});
eof ->
ok;
Err ->
exit(Err)
end.
import_terms(LServer, Mods, [Term|Terms]) ->
import_term(LServer, Mods, Term),
import_terms(LServer, Mods, Terms);
import_terms(_LServer, _Mods, []) ->
ok.
import_term(LServer, [{Mod, DBType}|Mods], Term) ->
case catch Mod:import(LServer, DBType, Term) of
pass -> import_term(LServer, Mods, Term);
ok -> ok;
Err ->
?ERROR_MSG("failed to import ~p for module ~p: ~p",
[Term, Mod, Err])
end;
import_term(_LServer, [], _Term) ->
ok.
prepare_output(FileName) ->
prepare_output(FileName, normal).
prepare_output(FileName, Type) when is_binary(FileName) ->
prepare_output(binary_to_list(FileName), Type);
prepare_output(FileName, normal) when is_list(FileName) ->
case file:open(FileName, [write, raw]) of
{ok, Fd} ->
Fd;
Err ->
exit(Err)
end;
prepare_output(FileName, disk_log) when is_list(FileName) ->
case disk_log:open([{name, make_ref()},
{repair, truncate},
{file, FileName}]) of
{ok, Fd} ->
#dump{fd = Fd};
Err ->
exit(Err)
end;
prepare_output(Output, _Type) ->
Output.
close_output(FileName, Fd) when FileName /= Fd ->
case Fd of
#dump{} ->
disk_log:close(Fd#dump.fd);
_ ->
file:close(Fd)
end,
ok;
close_output(_, _) ->
ok.
flatten(SQLs) ->
flatten(SQLs, []).
flatten([L|Ls], Acc) ->
flatten(Ls, flatten1(lists:reverse(L), Acc));
flatten([], Acc) ->
Acc.
flatten1([H|T], Acc) ->
flatten1(T, [[H, $\n]|Acc]);
flatten1([], Acc) ->
Acc.
|
