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-rw-r--r--lib/mnesia/src/mnesia.erl100
-rw-r--r--lib/mnesia/src/mnesia_bup.erl29
-rw-r--r--lib/mnesia/src/mnesia_schema.erl206
3 files changed, 300 insertions, 35 deletions
diff --git a/lib/mnesia/src/mnesia.erl b/lib/mnesia/src/mnesia.erl
index f34129268b..6818f9a65d 100644
--- a/lib/mnesia/src/mnesia.erl
+++ b/lib/mnesia/src/mnesia.erl
@@ -82,7 +82,8 @@
system_info/0, % Not for public use
%% Database mgt
- create_schema/1, delete_schema/1,
+ create_schema/1, create_schema/2, delete_schema/1,
+ add_backend_type/2,
backup/1, backup/2, traverse_backup/4, traverse_backup/6,
install_fallback/1, install_fallback/2,
uninstall_fallback/0, uninstall_fallback/1,
@@ -197,6 +198,9 @@ e_has_var(X, Pos) ->
%% Start and stop
start() ->
+ start([]).
+
+start_() ->
{Time , Res} = timer:tc(application, start, [?APPLICATION, temporary]),
Secs = Time div 1000000,
@@ -232,7 +236,7 @@ patched_start([{Env, Val} | Tail]) when is_atom(Env) ->
patched_start([Head | _]) ->
{error, {bad_type, Head}};
patched_start([]) ->
- start().
+ start_().
stop() ->
case application:stop(?APPLICATION) of
@@ -1898,6 +1902,8 @@ raw_table_info(Tab, Item) ->
info_reply(?ets_info(Tab, Item), Tab, Item);
disc_only_copies ->
info_reply(dets:info(Tab, Item), Tab, Item);
+ {ext, Alias, Mod} ->
+ info_reply(catch Mod:info(Alias, Tab, Item), Tab, Item);
unknown ->
bad_info_reply(Tab, Item)
end
@@ -2010,15 +2016,26 @@ display_tab_info() ->
MasterTabs = mnesia_recover:get_master_node_tables(),
io:format("master node tables = ~p~n", [lists:sort(MasterTabs)]),
+ case get_backend_types() of
+ [] -> ok;
+ Ts -> list_backend_types(Ts, "backend types = ")
+ end,
+
+ case get_index_plugins() of
+ [] -> ok;
+ Ps -> list_index_plugins(Ps, "index plugins = ")
+ end,
+
Tabs = system_info(tables),
- {Unknown, Ram, Disc, DiscOnly} =
- lists:foldl(fun storage_count/2, {[], [], [], []}, Tabs),
+ {Unknown, Ram, Disc, DiscOnly, Ext} =
+ lists:foldl(fun storage_count/2, {[], [], [], [], []}, Tabs),
io:format("remote = ~p~n", [lists:sort(Unknown)]),
io:format("ram_copies = ~p~n", [lists:sort(Ram)]),
io:format("disc_copies = ~p~n", [lists:sort(Disc)]),
io:format("disc_only_copies = ~p~n", [lists:sort(DiscOnly)]),
+ [io:format("~-19s= ~p~n", [atom_to_list(A), Ts]) || {A,Ts} <- Ext],
Rfoldl = fun(T, Acc) ->
Rpat =
@@ -2026,7 +2043,7 @@ display_tab_info() ->
read_only ->
lists:sort([{A, read_only} || A <- val({T, active_replicas})]);
read_write ->
- table_info(T, where_to_commit)
+ [fix_wtc(W) || W <- table_info(T, where_to_commit)]
end,
case lists:keysearch(Rpat, 1, Acc) of
{value, {_Rpat, Rtabs}} ->
@@ -2039,12 +2056,60 @@ display_tab_info() ->
Rdisp = fun({Rpat, Rtabs}) -> io:format("~p = ~p~n", [Rpat, Rtabs]) end,
lists:foreach(Rdisp, lists:sort(Repl)).
-storage_count(T, {U, R, D, DO}) ->
+get_backend_types() ->
+ case ?catch_val({schema, user_property, mnesia_backend_types}) of
+ {'EXIT', _} ->
+ [];
+ {mnesia_backend_types, Ts} ->
+ lists:sort(Ts)
+ end.
+
+get_index_plugins() ->
+ case ?catch_val({schema, user_property, mnesia_index_plugins}) of
+ {'EXIT', _} ->
+ [];
+ {mnesia_index_plugins, Ps} ->
+ lists:sort(Ps)
+ end.
+
+
+list_backend_types([{A,M} | T] = Ts, Legend) ->
+ Indent = [$\s || _ <- Legend],
+ W = integer_to_list(
+ lists:foldl(fun({Alias,_}, Wa) ->
+ erlang:max(Wa, length(atom_to_list(Alias)))
+ end, 0, Ts)),
+ io:fwrite(Legend ++ "~-" ++ W ++ "s - ~s~n",
+ [atom_to_list(A), atom_to_list(M)]),
+ [io:fwrite(Indent ++ "~-" ++ W ++ "s - ~s~n",
+ [atom_to_list(A1), atom_to_list(M1)])
+ || {A1,M1} <- T].
+
+list_index_plugins([{N,M,F} | T] = Ps, Legend) ->
+ Indent = [$\s || _ <- Legend],
+ W = integer_to_list(
+ lists:foldl(fun({N1,_,_}, Wa) ->
+ erlang:max(Wa, length(pp_ix_name(N1)))
+ end, 0, Ps)),
+ io:fwrite(Legend ++ "~-" ++ W ++ "s - ~s:~s~n",
+ [pp_ix_name(N), atom_to_list(M), atom_to_list(F)]),
+ [io:fwrite(Indent ++ "~-" ++ W ++ "s - ~s:~s~n",
+ [pp_ix_name(N1), atom_to_list(M1), atom_to_list(F1)])
+ || {N1,M1,F1} <- T].
+
+pp_ix_name(N) ->
+ lists:flatten(io_lib:fwrite("~w", [N])).
+
+fix_wtc({N, {ext,A,_}}) -> {N, A};
+fix_wtc({N,A}) when is_atom(A) -> {N, A}.
+
+storage_count(T, {U, R, D, DO, Ext}) ->
case table_info(T, storage_type) of
- unknown -> {[T | U], R, D, DO};
- ram_copies -> {U, [T | R], D, DO};
- disc_copies -> {U, R, [T | D], DO};
- disc_only_copies -> {U, R, D, [T | DO]}
+ unknown -> {[T | U], R, D, DO, Ext};
+ ram_copies -> {U, [T | R], D, DO, Ext};
+ disc_copies -> {U, R, [T | D], DO, Ext};
+ disc_only_copies -> {U, R, D, [T | DO], Ext};
+ {ext, A, _} -> {U, R, D, DO, orddict:append(A, T, Ext)}
end.
system_info(Item) ->
@@ -2059,9 +2124,10 @@ system_info2(all) ->
system_info2(db_nodes) ->
DiscNs = ?catch_val({schema, disc_copies}),
RamNs = ?catch_val({schema, ram_copies}),
+ ExtNs = ?catch_val({schema, external_copies}),
if
- is_list(DiscNs), is_list(RamNs) ->
- DiscNs ++ RamNs;
+ is_list(DiscNs), is_list(RamNs), is_list(ExtNs) ->
+ DiscNs ++ RamNs ++ ExtNs;
true ->
case mnesia_schema:read_nodes() of
{ok, Nodes} -> Nodes;
@@ -2165,6 +2231,7 @@ system_info2(access_module) -> mnesia_monitor:get_env(access_module);
system_info2(auto_repair) -> mnesia_monitor:get_env(auto_repair);
system_info2(is_running) -> mnesia_lib:is_running();
system_info2(backup_module) -> mnesia_monitor:get_env(backup_module);
+system_info2(backend_types) -> mnesia_schema:backend_types();
system_info2(event_module) -> mnesia_monitor:get_env(event_module);
system_info2(debug) -> mnesia_monitor:get_env(debug);
system_info2(dump_log_load_regulation) -> mnesia_monitor:get_env(dump_log_load_regulation);
@@ -2201,6 +2268,7 @@ system_info_items(yes) ->
[
access_module,
auto_repair,
+ backend_types,
backup_module,
checkpoints,
db_nodes,
@@ -2294,11 +2362,17 @@ load_mnesia_or_abort() ->
%% Database mgt
create_schema(Ns) ->
- mnesia_bup:create_schema(Ns).
+ create_schema(Ns, []).
+
+create_schema(Ns, Properties) ->
+ mnesia_bup:create_schema(Ns, Properties).
delete_schema(Ns) ->
mnesia_schema:delete_schema(Ns).
+add_backend_type(Alias, Module) ->
+ mnesia_schema:add_backend_type(Alias, Module).
+
backup(Opaque) ->
mnesia_log:backup(Opaque).
diff --git a/lib/mnesia/src/mnesia_bup.erl b/lib/mnesia/src/mnesia_bup.erl
index 8b1143a352..2c756b1c75 100644
--- a/lib/mnesia/src/mnesia_bup.erl
+++ b/lib/mnesia/src/mnesia_bup.erl
@@ -28,6 +28,7 @@
fallback_exists/0,
tm_fallback_start/1,
create_schema/1,
+ create_schema/2,
install_fallback/1,
install_fallback/2,
uninstall_fallback/0,
@@ -262,7 +263,7 @@ convert_0_1(Schema) ->
Cs = mnesia_schema:list2cs(List),
convert_0_1(Schema2, [], Cs);
false ->
- List = mnesia_schema:get_initial_schema(disc_copies, [node()]),
+ List = mnesia_schema:get_initial_schema(disc_copies, [node()], []),
Cs = mnesia_schema:list2cs(List),
convert_0_1(Schema, [], Cs)
end.
@@ -310,16 +311,19 @@ schema2bup({schema, Tab, TableDef}) ->
%% Create schema on the given nodes
%% Requires that old schemas has been deleted
%% Returns ok | {error, Reason}
-create_schema([]) ->
- create_schema([node()]);
-create_schema(Ns) when is_list(Ns) ->
+create_schema(Nodes) ->
+ create_schema(Nodes, []).
+
+create_schema([], Props) ->
+ create_schema([node()], Props);
+create_schema(Ns, Props) when is_list(Ns), is_list(Props) ->
case is_set(Ns) of
true ->
- create_schema(Ns, mnesia_schema:ensure_no_schema(Ns));
+ create_schema(Ns, mnesia_schema:ensure_no_schema(Ns), Props);
false ->
{error, {combine_error, Ns}}
end;
-create_schema(Ns) ->
+create_schema(Ns, _Props) ->
{error, {badarg, Ns}}.
is_set(List) when is_list(List) ->
@@ -327,7 +331,7 @@ is_set(List) when is_list(List) ->
is_set(_) ->
false.
-create_schema(Ns, ok) ->
+create_schema(Ns, ok, Props) ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
@@ -346,7 +350,7 @@ create_schema(Ns, ok) ->
Str = mk_str(),
File = mnesia_lib:dir(Str),
file:delete(File),
- try make_initial_backup(Ns, File, Mod) of
+ try make_initial_backup(Ns, File, Mod, Props) of
{ok, _Res} ->
case do_install_fallback(File, Mod) of
ok ->
@@ -363,9 +367,9 @@ create_schema(Ns, ok) ->
{error, Reason} ->
{error, Reason}
end;
-create_schema(_Ns, {error, Reason}) ->
+create_schema(_Ns, {error, Reason}, _) ->
{error, Reason};
-create_schema(_Ns, Reason) ->
+create_schema(_Ns, Reason, _) ->
{error, Reason}.
mk_str() ->
@@ -373,7 +377,10 @@ mk_str() ->
lists:concat([node()] ++ Now ++ ".TMP").
make_initial_backup(Ns, Opaque, Mod) ->
- Orig = mnesia_schema:get_initial_schema(disc_copies, Ns),
+ make_initial_backup(Ns, Opaque, Mod, []).
+
+make_initial_backup(Ns, Opaque, Mod, Props) ->
+ Orig = mnesia_schema:get_initial_schema(disc_copies, Ns, Props),
Modded = proplists:delete(storage_properties, proplists:delete(majority, Orig)),
Schema = [{schema, schema, Modded}],
O2 = do_apply(Mod, open_write, [Opaque], Opaque),
diff --git a/lib/mnesia/src/mnesia_schema.erl b/lib/mnesia/src/mnesia_schema.erl
index 76a9dbf26c..1aebd8f762 100644
--- a/lib/mnesia/src/mnesia_schema.erl
+++ b/lib/mnesia/src/mnesia_schema.erl
@@ -29,6 +29,11 @@
-module(mnesia_schema).
-export([
+ add_backend_type/2,
+ do_add_backend_type/2,
+ delete_backend_type/1,
+ do_delete_backend_type/1,
+ backend_types/0,
add_snmp/2,
add_table_copy/3,
add_table_index/2,
@@ -55,11 +60,12 @@
dump_tables/1,
ensure_no_schema/1,
get_create_list/1,
- get_initial_schema/2,
+ get_initial_schema/3,
get_table_properties/1,
info/0,
info/1,
init/1,
+ init_backends/0,
insert_cstruct/3,
is_remote_member/1,
list2cs/1,
@@ -143,7 +149,24 @@ init(IgnoreFallback) ->
set({schema, where_to_read}, node()),
set({schema, load_node}, node()),
set({schema, load_reason}, initial),
- mnesia_controller:add_active_replica(schema, node()).
+ mnesia_controller:add_active_replica(schema, node()),
+ init_backends().
+
+
+init_backends() ->
+ Backends = lists:foldl(fun({Alias, Mod}, Acc) ->
+ orddict:append(Mod, Alias, Acc)
+ end, orddict:new(), get_ext_types()),
+ [init_backend(Mod, Aliases) || {Mod, Aliases} <- Backends],
+ ok.
+
+init_backend(Mod, [_|_] = Aliases) ->
+ case Mod:init_backend() of
+ ok ->
+ Mod:add_aliases(Aliases);
+ Error ->
+ mnesia:abort({backend_init_error, Error})
+ end.
exit_on_error({error, Reason}) ->
exit(Reason);
@@ -525,9 +548,14 @@ do_read_disc_schema(Fname, Keep) ->
Res.
get_initial_schema(SchemaStorage, Nodes) ->
+ get_initial_schema(SchemaStorage, Nodes, []).
+
+get_initial_schema(SchemaStorage, Nodes, Properties) -> %
+ UserProps = initial_schema_properties(Properties),
Cs = #cstruct{name = schema,
record_name = schema,
- attributes = [table, cstruct]},
+ attributes = [table, cstruct],
+ user_properties = UserProps},
Cs2 =
case SchemaStorage of
ram_copies -> Cs#cstruct{ram_copies = Nodes};
@@ -535,6 +563,30 @@ get_initial_schema(SchemaStorage, Nodes) ->
end,
cs2list(Cs2).
+initial_schema_properties(Props0) ->
+ DefaultProps = remove_duplicates(mnesia_monitor:get_env(schema)),
+ Props = lists:foldl(
+ fun({K,V}, Acc) ->
+ lists:keystore(K, 1, Acc, {K,V})
+ end, DefaultProps, remove_duplicates(Props0)),
+ initial_schema_properties_(Props).
+
+initial_schema_properties_([{backend_types, Types}|Props]) ->
+ lists:foreach(fun({Name, Module}) ->
+ verify_backend_type(Name, Module)
+ end, Types),
+ [{mnesia_backend_types, Types}|initial_schema_properties_(Props)];
+initial_schema_properties_([P|_Props]) ->
+ mnesia:abort({bad_schema_property, P});
+initial_schema_properties_([]) ->
+ [].
+
+remove_duplicates([{K,_} = H|T]) ->
+ [H | remove_duplicates([X || {K1,_} = X <- T,
+ K1 =/= K])];
+remove_duplicates([]) ->
+ [].
+
read_cstructs_from_disc() ->
%% Assumptions:
%% - local schema lock in global
@@ -783,6 +835,25 @@ pick(Tab, Key, List, Default) ->
mnesia:abort({bad_type, Tab, BadArg})
end.
+get_ext_types() ->
+ get_schema_user_property(mnesia_backend_types).
+
+get_schema_user_property(Key) ->
+ Tab = schema,
+ %% Must work reliably both within transactions and outside of transactions
+ Res = case get(mnesia_activity_state) of
+ undefined ->
+ dirty_read_table_property(Tab, Key);
+ _ ->
+ do_read_table_property(Tab, Key)
+ end,
+ case Res of
+ undefined ->
+ [];
+ {_, Types} ->
+ Types
+ end.
+
%% Convert attribute name to integer if neccessary
attr_tab_to_pos(_Tab, Pos) when is_integer(Pos) ->
Pos;
@@ -1039,6 +1110,103 @@ check_active([{badrpc, Reason} | _Replies], Expl, Tab) ->
check_active([], _Expl, _Tab) ->
ok.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Function for definining an external backend type
+
+add_backend_type(Name, Module) ->
+ case schema_transaction(fun() -> do_add_backend_type(Name, Module) end) of
+ {atomic, NeedsInit} ->
+ case NeedsInit of
+ true ->
+ Module:init_backend();
+ false ->
+ ignore
+ end,
+ Module:add_aliases([Name]),
+ {atomic, ok};
+ Other ->
+ Other
+ end.
+
+do_add_backend_type(Name, Module) ->
+ verify_backend_type(Name, Module),
+ Types = case do_read_table_property(schema, mnesia_backend_types) of
+ undefined ->
+ [];
+ {_, Ts} ->
+ case lists:keymember(Name, 1, Ts) of
+ true ->
+ mnesia:abort({backend_type_already_exists, Name});
+ false ->
+ Ts
+ end
+ end,
+ ModuleRegistered = lists:keymember(Module, 2, Types),
+ do_write_table_property(schema, {mnesia_backend_types,
+ [{Name, Module}|Types]}),
+ ModuleRegistered.
+
+delete_backend_type(Name) ->
+ schema_transaction(fun() -> do_delete_backend_type(Name) end).
+
+do_delete_backend_type(Name) ->
+ case do_read_table_property(schema, mnesia_backend_types) of
+ undefined ->
+ [];
+ {_, Ts} ->
+ case lists:keyfind(Name, 1, Ts) of
+ {_, Mod} ->
+ case using_backend_type(Name, Mod) of
+ [_|_] = Tabs ->
+ mnesia:abort({backend_in_use, {Name, Tabs}});
+ [] ->
+ do_write_table_property(
+ schema, {mnesia_backend_types,
+ lists:keydelete(Name, 1, Ts)})
+ end;
+ false ->
+ mnesia:abort({no_such_backend, Name})
+ end
+ end.
+
+using_backend_type(Name, Mod) ->
+ Ext = ets:select(mnesia_gvar,
+ [{ {{'$1',external_copies},'$2'}, [], [{{'$1','$2'}}] }]),
+ Entry = {Name, Mod},
+ [T || {T,C} <- Ext,
+ lists:keymember(Entry, 1, C)].
+
+verify_backend_type(Name, Module) ->
+ case legal_backend_name(Name) of
+ false ->
+ mnesia:abort({bad_type, {backend_type,Name,Module}});
+ true ->
+ ok
+ end,
+ ExpectedExports = mnesia_backend_type:behaviour_info(callbacks),
+ Exports = try Module:module_info(exports)
+ catch
+ error:_ ->
+ mnesia:abort({undef_backend, Module})
+ end,
+ case ExpectedExports -- Exports of
+ [] ->
+ ok;
+ _Other ->
+ io:fwrite(user, "Missing backend_type exports: ~p~n", [_Other]),
+ mnesia:abort({bad_type, {backend_type,Name,Module}})
+ end.
+
+legal_backend_name(Name) ->
+ is_atom(Name) andalso
+ (not lists:member(Name, record_info(fields, cstruct))).
+
+%% Used e.g. by mnesia:system_info(backend_types).
+backend_types() ->
+ [ram_copies, disc_copies, disc_only_copies |
+ [T || {T,_} <- get_ext_types()]].
+
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Here's the real interface function to create a table
@@ -1711,22 +1879,38 @@ do_read_table_property(Tab, Key) ->
{_, _, Ts} = TidTs,
Store = Ts#tidstore.store,
Props = ets:foldl(
- fun({op, create_table, [{name, T}|Opts]}, _Acc)
- when T==Tab ->
+ fun({op, announce_im_running,_,Opts,_,_}, _Acc) when Tab==schema ->
+ find_props(Opts);
+ ({op, create_table, [{name, T}|Opts]}, _Acc)
+ when T==Tab ->
find_props(Opts);
({op, Op, [{name,T}|Opts], _Prop}, _Acc)
- when T==Tab, Op==write_property; Op==delete_property ->
+ when T==Tab, Op==write_property;
+ T==Tab, Op==delete_property ->
find_props(Opts);
({op, delete_table, [{name,T}|_]}, _Acc)
when T==Tab ->
[];
(_Other, Acc) ->
Acc
- end, [], Store),
- case lists:keysearch(Key, 1, Props) of
- {value, Property} ->
- Property;
- false ->
+ end, undefined, Store),
+ case Props of
+ undefined ->
+ get_tid_ts_and_lock(Tab, read),
+ dirty_read_table_property(Tab, Key);
+ _ when is_list(Props) ->
+ case lists:keyfind(Key, 1, Props) of
+ false ->
+ undefined;
+ Other ->
+ Other
+ end
+ end.
+
+dirty_read_table_property(Tab, Key) ->
+ try ets:lookup_element(mnesia_gvar, {Tab,user_property,Key}, 2)
+ catch
+ error:_ ->
undefined
end.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 12:09:27 +0000