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-module(gen_storage_migration).
-export([migrate_mnesia/3, migrate_odbc/3]).
-include("ejabberd.hrl").
%% @spec (Host::storage_host(), Table::atom(), Migrations) -> any()
%% Migrations = [{OldTable, OldAttributes, MigrateFun}]
migrate_mnesia(Host, Table, Migrations) ->
SameTableName = [Migration
|| {OldTable, _, _} = Migration <- Migrations,
OldTable =:= Table],
lists:foreach(fun(Migration) ->
case (catch migrate_mnesia1(Host, Table, Migration)) of
ok -> ok;
ignored -> ok;
R ->
?ERROR_MSG("Error performing migration ~p:~n~p",
[Migration, R])
end
end, SameTableName),
DifferentTableName = [Migration
|| {OldTable, _, _} = Migration <- Migrations,
OldTable =/= Table],
lists:foreach(fun(Migration) ->
case (catch migrate_mnesia1(Host, Table, Migration)) of
ok -> ok;
ignored -> ok;
R ->
?ERROR_MSG("Error performing migration ~p:~n~p",
[Migration, R])
end
end, DifferentTableName).
migrate_mnesia1(Host, Table, {OldTable, OldAttributes, MigrateFun}) ->
HostB = list_to_binary(Host),
case (catch mnesia:table_info(OldTable, attributes)) of
OldAttributes ->
if
Table =:= OldTable ->
%% TODO: move into transaction
TmpTable = list_to_atom(atom_to_list(Table) ++ "_tmp"),
NewRecordName = gen_storage:table_info(HostB, Table, record_name),
NewAttributes = gen_storage:table_info(HostB, Table, attributes),
?INFO_MSG("Migrating mnesia table ~p via ~p~nfrom ~p~nto ~p",
[Table, TmpTable, OldAttributes, NewAttributes]),
{atomic, ok} = mnesia:create_table(
TmpTable,
[{disc_only_copies, [node()]},
{type, bag},
{local_content, true},
{record_name, NewRecordName},
{attributes, NewAttributes}]),
F1 = fun() ->
mnesia:write_lock_table(TmpTable),
mnesia:foldl(
fun(OldRecord, _) ->
NewRecord = MigrateFun(OldRecord),
?DEBUG("~p-~p: ~p -> ~p~n",[OldTable, Table, OldRecord, NewRecord]),
if
is_tuple(NewRecord) ->
mnesia:write(TmpTable, NewRecord, write);
true ->
ignored
end
end, ok, OldTable)
end,
{atomic, ok} = mnesia:transaction(F1),
mnesia:delete_table(OldTable),
TableInfo = gen_storage:table_info(HostB, Table, all),
{value, {_, Backend}} = lists:keysearch(backend, 1, TableInfo),
gen_storage:create_table(Backend, HostB, Table, TableInfo),
F2 = fun() ->
mnesia:write_lock_table(Table),
mnesia:foldl(
fun(NewRecord, _) ->
?DEBUG("~p-~p: ~p~n",[OldTable, Table, NewRecord]),
gen_storage:write(HostB, Table, NewRecord, write)
end, ok, TmpTable)
end,
{atomic, ok} = mnesia:transaction(F2),
mnesia:delete_table(TmpTable),
?INFO_MSG("Migration of mnesia table ~p successfully finished", [Table]);
Table =/= OldTable ->
?INFO_MSG("Migrating mnesia table ~p to ~p~nfrom ~p",
[OldTable, Table, OldAttributes]),
F1 = fun() ->
mnesia:write_lock_table(Table),
mnesia:foldl(
fun(OldRecord, _) ->
NewRecord = MigrateFun(OldRecord),
?DEBUG("~p-~p: ~p -> ~p~n",[OldTable, Table, OldRecord, NewRecord]),
if
is_tuple(NewRecord) ->
gen_storage:write(HostB, Table, NewRecord, write);
true ->
ignored
end
end, ok, OldTable)
end,
{atomic, _} = mnesia:transaction(F1),
mnesia:delete_table(OldTable),
?INFO_MSG("Migration of mnesia table ~p successfully finished", [Table]),
ok
end;
_ ->
ignored
end.
migrate_odbc(Host, Tables, Migrations) ->
try ejabberd_odbc:sql_transaction(
Host,
fun() ->
lists:foreach(
fun(Migration) ->
case (catch migrate_odbc1(Host, Tables, Migration)) of
ok -> ok;
ignored -> ok;
R ->
?ERROR_MSG("Error performing migration ~p:~n~p",
[Migration, R])
end
end, Migrations)
end)
catch exit:{noproc, _Where} ->
?INFO_MSG("Not migrating ODBC on host ~p because no ODBC was configured.", [Host]),
ok
end.
migrate_odbc1(Host, Tables, {OldTable, OldColumns, MigrateFun}) ->
migrate_odbc1(Host, Tables, {[{OldTable, OldColumns}], MigrateFun});
migrate_odbc1(Host, Tables, {OldTablesColumns, MigrateFun}) ->
{[OldTable | _] = OldTables,
[OldColumns | _] = OldColumnsAll} = lists:unzip(OldTablesColumns),
OldTablesA = [list_to_atom(Table) || Table <- OldTables],
ColumnsT = [odbc_table_columns_t(OldTable1) || OldTable1 <- OldTables],
migrate_odbc2(Host, Tables, OldTable, OldTables, OldColumns, OldColumnsAll, OldTablesA, ColumnsT, MigrateFun).
migrate_odbc2(Host, Tables, OldTable, OldTables, OldColumns, OldColumnsAll, OldTablesA, ColumnsT, MigrateFun)
when ColumnsT == OldColumnsAll ->
?INFO_MSG("Migrating ODBC table ~p to gen_storage tables ~p", [OldTable, Tables]),
HostB = list_to_binary(Host),
%% rename old tables to *_old
lists:foreach(fun(OldTable1) ->
{updated, _} =
ejabberd_odbc:sql_query_t("alter table " ++ OldTable1 ++
" rename to " ++ OldTable1 ++ "_old")
end, OldTables),
%% recreate new tables
lists:foreach(fun(NewTable) ->
case lists:member(NewTable, OldTablesA) of
true ->
TableInfo =
gen_storage:table_info(HostB, NewTable, all),
{value, {_, Backend}} =
lists:keysearch(backend, 1, TableInfo),
gen_storage:create_table(Backend, HostB,
NewTable, TableInfo);
false -> ignored
end
end, Tables),
SELECT =
fun(Columns, Table, Keys) ->
Table1 = case lists:member(Table, OldTables) of
true -> Table ++ "_old";
false -> Table
end,
WherePart = case Keys of
[] -> "";
_ -> " WHERE " ++
string:join([K ++ "=" ++
if
is_list(V) ->
"\"" ++ ejabberd_odbc:escape(V) ++ "\"";
is_integer(V) ->
integer_to_list(V)
end
|| {K, V} <- Keys],
" AND ")
end,
{selected, _, Rows} =
ejabberd_odbc:sql_query_t("SELECT " ++ string:join(Columns, ", ") ++
" FROM " ++ Table1 ++
WherePart),
[tuple_to_list(Row) || Row <- Rows]
end,
%% TODO: this will need lots of RAM, make it batched
OldRows = SELECT(OldColumns, OldTable, []),
NRows =
lists:foldl(fun(OldRow, NRow) ->
NewRecords = apply(MigrateFun, [SELECT | OldRow]),
if
is_list(NewRecords) ->
lists:foreach(
fun(NewRecord) ->
%% TODO: gen_storage transaction?
gen_storage:dirty_write(HostB, NewRecord)
end, NewRecords);
is_tuple(NewRecords) ->
gen_storage:dirty_write(HostB, NewRecords)
end,
NRow + 1
end, 0, OldRows),
lists:foreach(fun(OldTable1) ->
{updated, _} = ejabberd_odbc:sql_query_t("drop table " ++ OldTable1 ++ "_old")
end, OldTables),
?INFO_MSG("Migrated ODBC table ~p to gen_storage tables ~p (~p rows)", [OldTable, Tables, NRows]),
ok;
migrate_odbc2(_Host, _Tables, _OldTable, _OldTables, _OldColumns, _OldColumnsAll, _OldTablesA, [[]], _MigrateFun) ->
ignored;
migrate_odbc2(Host, Tables, OldTable, OldTables, OldColumns, OldColumnsAll, OldTablesA, [ColumnsTAndCreatedat | MoreCTAC], MigrateFun)
when ColumnsTAndCreatedat /= OldColumnsAll ->
case lists:last(ColumnsTAndCreatedat) of
"created_at" ->
ColumnsT = ColumnsTAndCreatedat -- ["created_at"],
migrate_odbc2(Host, Tables, OldTable, OldTables, OldColumns, OldColumnsAll, OldTablesA, [ColumnsT | MoreCTAC], MigrateFun);
_ ->
ignored
end.
odbc_table_columns_t(Table) ->
case ejabberd_odbc:sql_query_t("select column_name from information_schema.columns where table_name='" ++ Table ++ "'") of
{selected, _, Columns1} ->
Columns2 = lists:map(fun({C}) -> C end, Columns1),
Columns2
end.
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