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authorDan Gudmundsson <[email protected]>2015-03-27 13:17:24 +0100
committerDan Gudmundsson <[email protected]>2015-03-27 13:17:24 +0100
commitbe89d435fbde795bcdc62b99529c5f77d42c6b62 (patch)
tree17c3aa3e96b9a9949fb68ba436d5c497d0f32786 /lib/mnesia/src/mnesia_bup.erl
parentec5bdad811999470d1effd2e8e53942e34738f5c (diff)
parenta83bf960f1018217d7f3c9c8387a37722aa93fc6 (diff)
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Merge branch 'dgud/mnesia/try-catch'
* dgud/mnesia/try-catch: mnesia: Replace catch with try-catch
Diffstat (limited to 'lib/mnesia/src/mnesia_bup.erl')
-rw-r--r--lib/mnesia/src/mnesia_bup.erl227
1 files changed, 106 insertions, 121 deletions
diff --git a/lib/mnesia/src/mnesia_bup.erl b/lib/mnesia/src/mnesia_bup.erl
index 71e610bd63..3fee952d77 100644
--- a/lib/mnesia/src/mnesia_bup.erl
+++ b/lib/mnesia/src/mnesia_bup.erl
@@ -78,24 +78,21 @@
%% BunchOfRecords will be [] when the iteration is done.
iterate(Mod, Fun, Opaque, Acc) ->
R = #restore{bup_module = Mod, bup_data = Opaque},
- case catch read_schema_section(R) of
- {error, Reason} ->
- {error, Reason};
- {R2, {Header, Schema, Rest}} ->
- case catch iter(R2, Header, Schema, Fun, Acc, Rest) of
- {ok, R3, Res} ->
- catch safe_apply(R3, close_read, [R3#restore.bup_data]),
- {ok, Res};
- {error, Reason} ->
- catch safe_apply(R2, close_read, [R2#restore.bup_data]),
- {error, Reason};
- {'EXIT', Pid, Reason} ->
- catch safe_apply(R2, close_read, [R2#restore.bup_data]),
- {error, {'EXIT', Pid, Reason}};
- {'EXIT', Reason} ->
- catch safe_apply(R2, close_read, [R2#restore.bup_data]),
- {error, {'EXIT', Reason}}
- end
+ try read_schema_section(R) of
+ {R2, {Header, Schema, Rest}} ->
+ try iter(R2, Header, Schema, Fun, Acc, Rest) of
+ {ok, R3, Res} ->
+ close_read(R3),
+ {ok, Res}
+ catch throw:Err ->
+ close_read(R2),
+ Err;
+ _:Reason ->
+ close_read(R2),
+ {error, {Reason, erlang:get_stacktrace()}}
+ end
+ catch throw:{error,_} = Err ->
+ Err
end.
iter(R, Header, Schema, Fun, Acc, []) ->
@@ -116,7 +113,7 @@ safe_apply(R, write, [_, Items]) when Items =:= [] ->
safe_apply(R, What, Args) ->
Abort = fun(Re) -> abort_restore(R, What, Args, Re) end,
Mod = R#restore.bup_module,
- case catch apply(Mod, What, Args) of
+ try apply(Mod, What, Args) of
{ok, Opaque, Items} when What =:= read ->
{R#restore{bup_data = Opaque}, Items};
{ok, Opaque} when What =/= read->
@@ -125,16 +122,19 @@ safe_apply(R, What, Args) ->
Abort(Re);
Re ->
Abort(Re)
+ catch _:Re ->
+ Abort(Re)
end.
-abort_restore(R, What, Args, Reason) ->
- Mod = R#restore.bup_module,
- Opaque = R#restore.bup_data,
+abort_restore(R = #restore{bup_module=Mod}, What, Args, Reason) ->
dbg_out("Restore aborted. ~p:~p~p -> ~p~n",
[Mod, What, Args, Reason]),
- catch apply(Mod, close_read, [Opaque]),
+ close_read(R),
throw({error, Reason}).
+close_read(#restore{bup_module=Mod, bup_data=Opaque}) ->
+ ?SAFE(Mod:close_read(Opaque)).
+
fallback_to_schema() ->
Fname = fallback_bup(),
fallback_to_schema(Fname).
@@ -145,40 +145,30 @@ fallback_to_schema(Fname) ->
{error, Reason} ->
{error, Reason};
Schema ->
- case catch lookup_schema(schema, Schema) of
- {error, _} ->
- {error, "No schema in fallback"};
- List ->
- {ok, fallback, List}
+ try lookup_schema(schema, Schema) of
+ List -> {ok, fallback, List}
+ catch throw:_ ->
+ {error, "No schema in fallback"}
end
end.
%% Opens Opaque reads schema and then close
read_schema(Mod, Opaque) ->
R = #restore{bup_module = Mod, bup_data = Opaque},
- case catch read_schema_section(R) of
- {error, Reason} ->
- {error, Reason};
- {R2, {_Header, Schema, _}} ->
- catch safe_apply(R2, close_read, [R2#restore.bup_data]),
- Schema
+ try read_schema_section(R) of
+ {_, {_Header, Schema, _}} -> Schema
+ catch throw:{error,_} = Error ->
+ Error
+ after close_read(R)
end.
%% Open backup media and extract schema
%% rewind backup media and leave it open
%% Returns {R, {Header, Schema}}
read_schema_section(R) ->
- case catch do_read_schema_section(R) of
- {'EXIT', Reason} ->
- catch safe_apply(R, close_read, [R#restore.bup_data]),
- {error, {'EXIT', Reason}};
- {error, Reason} ->
- catch safe_apply(R, close_read, [R#restore.bup_data]),
- {error, Reason};
- {R2, {H, Schema, Rest}} ->
- Schema2 = convert_schema(H#log_header.log_version, Schema),
- {R2, {H, Schema2, Rest}}
- end.
+ {R2, {H, Schema, Rest}} = do_read_schema_section(R),
+ Schema2 = convert_schema(H#log_header.log_version, Schema),
+ {R2, {H, Schema2, Rest}}.
do_read_schema_section(R) ->
R2 = safe_apply(R, open_read, [R#restore.bup_data]),
@@ -201,7 +191,7 @@ do_read_schema_section(R, {ok, B, _C, Rest}, Acc) ->
{R, {B, Acc, Rest}};
do_read_schema_section(_R, {error, Reason}, _Acc) ->
- {error, Reason}.
+ throw({error, Reason}).
verify_header([H | RawSchema]) when is_record(H, log_header) ->
Current = mnesia_log:backup_log_header(),
@@ -218,7 +208,7 @@ verify_header([H | RawSchema]) when is_record(H, log_header) ->
{error, {"Bad kind of header. Cannot be used as backup.", H}}
end;
verify_header(RawSchema) ->
- {error, {"Missing header. Cannot be used as backup.", catch hd(RawSchema)}}.
+ {error, {"Missing header. Cannot be used as backup.", ?CATCH(hd(RawSchema))}}.
refresh_cookie(Schema, NewCookie) ->
case lists:keysearch(schema, 2, Schema) of
@@ -345,7 +335,7 @@ create_schema(Ns, ok) ->
Str = mk_str(),
File = mnesia_lib:dir(Str),
file:delete(File),
- case catch make_initial_backup(Ns, File, Mod) of
+ try make_initial_backup(Ns, File, Mod) of
{ok, _Res} ->
case do_install_fallback(File, Mod) of
ok ->
@@ -353,8 +343,8 @@ create_schema(Ns, ok) ->
ok;
{error, Reason} ->
{error, Reason}
- end;
- {error, Reason} ->
+ end
+ catch throw:{error, Reason} ->
{error, Reason}
end
end
@@ -384,10 +374,11 @@ make_initial_backup(Ns, Opaque, Mod) ->
do_apply(_, write, [_, Items], Opaque) when Items =:= [] ->
Opaque;
do_apply(Mod, What, Args, _Opaque) ->
- case catch apply(Mod, What, Args) of
+ try apply(Mod, What, Args) of
{ok, Opaque2} -> Opaque2;
- {error, Reason} -> throw({error, Reason});
- {'EXIT', Reason} -> throw({error, {'EXIT', Reason}})
+ {error, Reason} -> throw({error, Reason})
+ catch _:Reason ->
+ throw({error, {'EXIT', Reason}})
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -425,11 +416,11 @@ do_install_fallback(_Opaque, Args) ->
{error, {badarg, Args}}.
check_fallback_args([Arg | Tail], FA) ->
- case catch check_fallback_arg_type(Arg, FA) of
- {'EXIT', _Reason} ->
- {error, {badarg, Arg}};
+ try check_fallback_arg_type(Arg, FA) of
FA2 ->
check_fallback_args(Tail, FA2)
+ catch error:_ ->
+ {error, {badarg, Arg}}
end;
check_fallback_args([], FA) ->
{ok, FA}.
@@ -484,7 +475,7 @@ install_fallback_master(ClientPid, FA) ->
State = {start, FA},
Opaque = FA#fallback_args.opaque,
Mod = FA#fallback_args.module,
- Res = (catch iterate(Mod, fun restore_recs/4, Opaque, State)),
+ Res = iterate(Mod, fun restore_recs/4, Opaque, State),
unlink(ClientPid),
ClientPid ! {self(), Res},
exit(shutdown).
@@ -496,9 +487,7 @@ restore_recs(Recs, Header, Schema, {start, FA}) ->
%% No records in backup
Schema2 = convert_schema(Header#log_header.log_version, Schema),
CreateList = lookup_schema(schema, Schema2),
- case catch mnesia_schema:list2cs(CreateList) of
- {'EXIT', Reason} ->
- throw({error, {"Bad schema in restore_recs", Reason}});
+ try mnesia_schema:list2cs(CreateList) of
Cs ->
Ns = get_fallback_nodes(FA, Cs#cstruct.disc_copies),
global:set_lock({{mnesia_table_lock, schema}, self()}, Ns, infinity),
@@ -508,6 +497,8 @@ restore_recs(Recs, Header, Schema, {start, FA}) ->
Res = restore_recs(Recs, Header, Schema2, Pids),
global:del_lock({{mnesia_table_lock, schema}, self()}, Ns),
Res
+ catch _:Reason ->
+ throw({error, {"Bad schema in restore_recs", Reason}})
end;
restore_recs([], _Header, _Schema, Pids) ->
@@ -579,45 +570,46 @@ fallback_tmp_name() -> "FALLBACK.TMP".
fallback_receiver(Master, FA) ->
process_flag(trap_exit, true),
- case catch register(mnesia_fallback, self()) of
- {'EXIT', _} ->
- Reason = {already_exists, node()},
- local_fallback_error(Master, Reason);
- true ->
- FA2 = check_fallback_dir(Master, FA),
- Bup = FA2#fallback_args.fallback_bup,
- case mnesia_lib:exists(Bup) of
- true ->
- Reason2 = {already_exists, node()},
- local_fallback_error(Master, Reason2);
- false ->
- Mod = mnesia_backup,
- Tmp = FA2#fallback_args.fallback_tmp,
- R = #restore{mode = replace,
- bup_module = Mod,
- bup_data = Tmp},
- file:delete(Tmp),
- case catch fallback_receiver_loop(Master, R, FA2, schema) of
- {error, Reason} ->
- local_fallback_error(Master, Reason);
- Other ->
- exit(Other)
- end
- end
- end.
+ Res = try
+ register(mnesia_fallback, self()),
+ FA2 = check_fallback_dir(FA),
+ Bup = FA2#fallback_args.fallback_bup,
+ false = mnesia_lib:exists(Bup),
+ Mod = mnesia_backup,
+ Tmp = FA2#fallback_args.fallback_tmp,
+ R = #restore{mode = replace,
+ bup_module = Mod,
+ bup_data = Tmp},
+ file:delete(Tmp),
+ fallback_receiver_loop(Master, R, FA2, schema)
+ catch
+ error:_ ->
+ Reason = {already_exists, node()},
+ local_fallback_error(Master, Reason);
+ throw:{error, Reason} ->
+ local_fallback_error(Master, Reason)
+ end,
+ exit(Res).
local_fallback_error(Master, Reason) ->
Master ! {self(), {error, Reason}},
unlink(Master),
exit(Reason).
+
check_fallback_dir(Master, FA) ->
+ try check_fallback_dir(FA)
+ catch throw:{error,Reason} ->
+ local_fallback_error(Master, Reason)
+ end.
+
+check_fallback_dir(FA) ->
case mnesia:system_info(schema_location) of
ram ->
Reason = {has_no_disc, node()},
- local_fallback_error(Master, Reason);
+ throw({error, Reason});
_ ->
- Dir = check_fallback_dir_arg(Master, FA),
+ Dir = check_fallback_dir_arg(FA),
Bup = filename:join([Dir, fallback_name()]),
Tmp = filename:join([Dir, fallback_tmp_name()]),
FA#fallback_args{fallback_bup = Bup,
@@ -625,22 +617,20 @@ check_fallback_dir(Master, FA) ->
mnesia_dir = Dir}
end.
-check_fallback_dir_arg(Master, FA) ->
+check_fallback_dir_arg(FA) ->
case FA#fallback_args.use_default_dir of
true ->
mnesia_lib:dir();
false when FA#fallback_args.scope =:= local ->
Dir = FA#fallback_args.mnesia_dir,
- case catch mnesia_monitor:do_check_type(dir, Dir) of
- {'EXIT', _R} ->
+ try mnesia_monitor:do_check_type(dir, Dir)
+ catch _:_ ->
Reason = {badarg, {dir, Dir}, node()},
- local_fallback_error(Master, Reason);
- AbsDir->
- AbsDir
- end;
+ throw({error, Reason})
+ end;
false when FA#fallback_args.scope =:= global ->
Reason = {combine_error, global, dir, node()},
- local_fallback_error(Master, Reason)
+ throw({error, Reason})
end.
fallback_receiver_loop(Master, R, FA, State) ->
@@ -666,7 +656,7 @@ fallback_receiver_loop(Master, R, FA, State) ->
Bup = FA#fallback_args.fallback_bup,
Tmp = FA#fallback_args.fallback_tmp,
throw_bad_res(ok, file:rename(Tmp, Bup)),
- catch mnesia_lib:set(active_fallback, true),
+ ?SAFE(mnesia_lib:set(active_fallback, true)),
?eval_debug_fun({?MODULE, fallback_receiver_loop, post_swap}, []),
Master ! {self(), ok},
fallback_receiver_loop(Master, R, FA, stop);
@@ -697,7 +687,7 @@ throw_bad_res(_Expected, Actual) -> throw({error, Actual}).
tm_fallback_start(IgnoreFallback) ->
mnesia_schema:lock_schema(),
Res = do_fallback_start(fallback_exists(), IgnoreFallback),
- mnesia_schema: unlock_schema(),
+ mnesia_schema:unlock_schema(),
case Res of
ok -> ok;
{error, Reason} -> exit(Reason)
@@ -715,9 +705,9 @@ do_fallback_start(true, false) ->
BupFile = fallback_bup(),
Mod = mnesia_backup,
LocalTabs = ?ets_new_table(mnesia_local_tables, [set, public, {keypos, 2}]),
- case catch iterate(Mod, fun restore_tables/4, BupFile, {start, LocalTabs}) of
+ case iterate(Mod, fun restore_tables/4, BupFile, {start, LocalTabs}) of
{ok, _Res} ->
- catch dets:close(schema),
+ ?SAFE(dets:close(schema)),
TmpSchema = mnesia_lib:tab2tmp(schema),
DatSchema = mnesia_lib:tab2dat(schema),
AllLT = ?ets_match_object(LocalTabs, '_'),
@@ -733,8 +723,6 @@ do_fallback_start(true, false) ->
{error, {"Cannot start from fallback. Rename error.", Reason}}
end;
{error, Reason} ->
- {error, {"Cannot start from fallback", Reason}};
- {'EXIT', Reason} ->
{error, {"Cannot start from fallback", Reason}}
end.
@@ -996,10 +984,10 @@ uninstall_fallback_master(ClientPid, FA) ->
case fallback_to_schema(Bup) of
{ok, fallback, List} ->
Cs = mnesia_schema:list2cs(List),
- case catch get_fallback_nodes(FA, Cs#cstruct.disc_copies) of
+ try get_fallback_nodes(FA, Cs#cstruct.disc_copies) of
Ns when is_list(Ns) ->
- do_uninstall(ClientPid, Ns, FA);
- {error, Reason} ->
+ do_uninstall(ClientPid, Ns, FA)
+ catch throw:{error, Reason} ->
local_fallback_error(ClientPid, Reason)
end;
{error, Reason} ->
@@ -1042,13 +1030,13 @@ local_uninstall_fallback(Master, FA) ->
%% Don't trap exit
register(mnesia_fallback, self()), % May exit
- FA2 = check_fallback_dir(Master, FA), % May exit
+ FA2 = check_fallback_dir(Master, FA), % May exit
Master ! {self(), started},
receive
{Master, do_uninstall} ->
?eval_debug_fun({?MODULE, uninstall_fallback2, pre_delete}, []),
- catch mnesia_lib:set(active_fallback, false),
+ ?SAFE(mnesia_lib:set(active_fallback, false)),
Tmp = FA2#fallback_args.fallback_tmp,
Bup = FA2#fallback_args.fallback_bup,
file:delete(Tmp),
@@ -1071,10 +1059,8 @@ rec_uninstall(ClientPid, [Pid | Pids], AccRes) ->
{Pid, BadRes} ->
rec_uninstall(ClientPid, Pids, BadRes)
end;
-rec_uninstall(ClientPid, [], Res) ->
- ClientPid ! {self(), Res},
- unlink(ClientPid),
- exit(normal).
+rec_uninstall(_, [], Res) ->
+ Res.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Backup traversal
@@ -1125,12 +1111,11 @@ do_traverse_backup(ClientPid, Source, SourceMod, Target, TargetMod, Fun, Acc) ->
Iter =
if
TargetMod =/= read_only ->
- case catch do_apply(TargetMod, open_write, [Target], Target) of
- {error, Error} ->
+ try do_apply(TargetMod, open_write, [Target], Target)
+ catch throw:{error, Error} ->
unlink(ClientPid),
ClientPid ! {iter_done, self(), {error, Error}},
- exit(Error);
- Else -> Else
+ exit(Error)
end;
true ->
ignore
@@ -1139,16 +1124,16 @@ do_traverse_backup(ClientPid, Source, SourceMod, Target, TargetMod, Fun, Acc) ->
Res =
case iterate(SourceMod, fun trav_apply/4, Source, A) of
{ok, {iter, _, Acc2, _, Iter2}} when TargetMod =/= read_only ->
- case catch do_apply(TargetMod, commit_write, [Iter2], Iter2) of
- {error, Reason} ->
- {error, Reason};
- _ ->
- {ok, Acc2}
+ try
+ do_apply(TargetMod, commit_write, [Iter2], Iter2),
+ {ok, Acc2}
+ catch throw:{error, Reason} ->
+ {error, Reason}
end;
{ok, {iter, _, Acc2, _, _}} ->
{ok, Acc2};
{error, Reason} when TargetMod =/= read_only->
- catch do_apply(TargetMod, abort_write, [Iter], Iter),
+ ?CATCH(do_apply(TargetMod, abort_write, [Iter], Iter)),
{error, {"Backup traversal failed", Reason}};
{error, Reason} ->
{error, {"Backup traversal failed", Reason}}