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Custom loglevels aka per module loglevels #71

Closed
wants to merge 4 commits into from

3 participants

@fenek

My current task at work is to integrate our ejabberd fork with lager and I needed to modify lager so it could provide exactly the same functionality as ejabberd's set_custom function. Tracing feature was not enough as it allowed me only to "lower" loglevel of specific module but I couldn't make it higher than global backend loglevel.
I didn't want to modify existing behaviour of tracing so I added a feature on top of existing solution, which may be some duplicate of tracing functionality but is easier to use and allows to make module loglevel higher.

@lavrin

Can we count on this being merged upstream?
The pull request's been hanging here for a while without any comment. Is it just because of lack of time/manpower for merging or some issue with the proposed changes?
In case of the latter please let us know, we will be happy to fix them (or the other way around -- just say it's rejected and why).
Thanks in advance!

@Vagabond
Collaborator

Manpower is the main holdup. I haven't had the time to understand what this code is trying to do, as I'm unfamiliar with the set_custom feature of ejabberd.

From my reading of this code, you can set a loglevel 'per module' and it can be higher or lower than the loglevel for a particular backend? So you can log messages from 'my_module' at debug to a file, OR ignore any messages below 'error' for that module?

I think this functionality is good, but I'm not sure of the approach yet. Also, the work over in PR #74 should make module-level filtering easier at the backend, because all metadata is passed in as data, not as a big preformatted string, so I've been working to get that merged in before addressing this.

Sorry for going dark on you. We'll get this functionality merged, one way or another.

Andrew

@Vagabond
Collaborator

Crap, looks like the reply I thought I made on this never got posted:

Now that PR #74 is merged, and things like 'module' are sent to the backend as metadata, can you adapt your patch to use that source of information instead? It should make your patch quite a bit smaller.

@fenek

Sure, I'll take a look at it soon I hope.

@Vagabond
Collaborator

Can you look at #95 and see if it meets your needs, you can now do traces like this:

lager:trace_console([{module, my_module}], '<error')

Which would print any messages from 'my_module' to the console that were less than 'error'.

@Vagabond
Collaborator

Closing due to inactivity.

@Vagabond Vagabond closed this
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Commits on Aug 22, 2012
  1. @fenek
  2. @fenek
  3. @fenek

    Fix log minlevel

    fenek authored
Commits on Aug 24, 2012
  1. @fenek

    Various bugfixes for tracing to work

    fenek authored
    Added test for per module loglevels
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View
2  include/lager.hrl
@@ -55,7 +55,7 @@
lager_util:level_to_num(Level) =< element(1, lager_mochiglobal:get(loglevel, {?LOG_NONE, []}))).
-define(NOTIFY(Level, Pid, Format, Args),
- gen_event:notify(lager_event, {log, lager_util:level_to_num(Level),
+ gen_event:notify(lager_event, {log, '_', lager_util:level_to_num(Level),
lager_util:format_time(), [io_lib:format("[~p] ", [Level]),
io_lib:format("~p ", [Pid]), io_lib:format(Format, Args)]})).
View
61 src/lager.erl
@@ -25,7 +25,9 @@
log/8, log_dest/9, log/3, log/4,
trace_file/2, trace_file/3, trace_console/1, trace_console/2,
clear_all_traces/0, stop_trace/1, status/0,
- get_loglevel/1, set_loglevel/2, set_loglevel/3, get_loglevels/0,
+ get_loglevel/1, get_mod_loglevel/2, get_loglevels/0,
+ set_loglevel/2, set_loglevel/3, set_mod_loglevel/3, set_mod_loglevel/4,
+ clear_mod_loglevel/2, clear_mod_loglevel/3,
minimum_loglevel/1, posix_error/1,
safe_format/3, safe_format_chop/3,dispatch_log/8]).
@@ -85,7 +87,7 @@ log(Level, Module, Function, Line, Pid, Time, Format, Args) ->
Msg = [["[", atom_to_list(Level), "] "],
io_lib:format("~p@~p:~p:~p ", [Pid, Module, Function, Line]),
safe_format_chop(Format, Args, 4096)],
- safe_notify({log, lager_util:level_to_num(Level), Timestamp, Msg}).
+ safe_notify({log, Module, lager_util:level_to_num(Level), Timestamp, Msg}).
%% @private
-spec log_dest(log_level(), atom(), atom(), pos_integer(), pid(), tuple(), list(), string(), list()) ->
@@ -97,7 +99,7 @@ log_dest(Level, Module, Function, Line, Pid, Time, Dest, Format, Args) ->
Msg = [["[", atom_to_list(Level), "] "],
io_lib:format("~p@~p:~p:~p ", [Pid, Module, Function, Line]),
safe_format_chop(Format, Args, 4096)],
- safe_notify({log, Dest, lager_util:level_to_num(Level), Timestamp, Msg}).
+ safe_notify({log_dest, Dest, lager_util:level_to_num(Level), Timestamp, Msg}).
%% @doc Manually log a message into lager without using the parse transform.
@@ -106,7 +108,7 @@ log(Level, Pid, Message) ->
Timestamp = lager_util:format_time(),
Msg = [["[", atom_to_list(Level), "] "], io_lib:format("~p ", [Pid]),
safe_format_chop("~s", [Message], 4096)],
- safe_notify({log, lager_util:level_to_num(Level), Timestamp, Msg}).
+ safe_notify({log, '_', lager_util:level_to_num(Level), Timestamp, Msg}).
%% @doc Manually log a message into lager without using the parse transform.
-spec log(log_level(), pid(), string(), list()) -> ok | {error, lager_not_running}.
@@ -114,7 +116,7 @@ log(Level, Pid, Format, Args) ->
Timestamp = lager_util:format_time(),
Msg = [["[", atom_to_list(Level), "] "], io_lib:format("~p ", [Pid]),
safe_format_chop(Format, Args, 4096)],
- safe_notify({log, lager_util:level_to_num(Level), Timestamp, Msg}).
+ safe_notify({log, '_', lager_util:level_to_num(Level), Timestamp, Msg}).
trace_file(File, Filter) ->
trace_file(File, Filter, debug).
@@ -221,19 +223,45 @@ status() ->
io:put_chars(Status).
%% @doc Set the loglevel for a particular backend.
-set_loglevel(Handler, Level) when is_atom(Level) ->
- Reply = gen_event:call(lager_event, Handler, {set_loglevel, Level}, infinity),
+set_loglevel(Handler, Level) ->
+ set_mod_loglevel(Handler, Level, '_').
+
+set_loglevel(Handler, Ident, Level) ->
+ set_mod_loglevel(Handler, Ident, Level, '_').
+
+%% @doc Set the loglevel for a particular backend and module.
+set_mod_loglevel(Handler, Level, Module) when is_atom(Level) ->
+ Reply = gen_event:call(lager_event, Handler, {set_loglevel, Level, Module}, infinity),
%% recalculate min log level
MinLog = minimum_loglevel(get_loglevels()),
{_, Traces} = lager_mochiglobal:get(loglevel),
lager_mochiglobal:put(loglevel, {MinLog, Traces}),
Reply.
-%% @doc Set the loglevel for a particular backend that has multiple identifiers
+%% @doc Set the loglevel for a particular module and backend that has multiple identifiers
%% (eg. the file backend).
-set_loglevel(Handler, Ident, Level) when is_atom(Level) ->
- io:format("handler: ~p~n", [{Handler, Ident}]),
- Reply = gen_event:call(lager_event, {Handler, Ident}, {set_loglevel, Level}, infinity),
+set_mod_loglevel(Handler, Ident, Level, Module) when is_atom(Level) ->
+ Reply = gen_event:call(lager_event, {Handler, Ident}, {set_loglevel, Level, Module}, infinity),
+ %% recalculate min log level
+ MinLog = minimum_loglevel(get_loglevels()),
+ {_, Traces} = lager_mochiglobal:get(loglevel),
+ lager_mochiglobal:put(loglevel, {MinLog, Traces}),
+ Reply.
+
+%% @doc Clear individual loglevel for certain module and backend. Use '_' for Module to
+%% clear all modules loglevels.
+clear_mod_loglevel(Handler, Module) ->
+ Reply = gen_event:call(lager_event, Handler, {clear_loglevel, Module}, infinity),
+ %% recalculate min log level
+ MinLog = minimum_loglevel(get_loglevels()),
+ {_, Traces} = lager_mochiglobal:get(loglevel),
+ lager_mochiglobal:put(loglevel, {MinLog, Traces}),
+ Reply.
+
+%% @doc Clear individual loglevel for certain module and backend that has multiple
+%% identifiers (eg. the file backend). Use '_' for Module to clear all modules loglevels.
+clear_mod_loglevel(Handler, Ident, Module) ->
+ Reply = gen_event:call(lager_event, {Handler, Ident}, {clear_loglevel, Module}, infinity),
%% recalculate min log level
MinLog = minimum_loglevel(get_loglevels()),
{_, Traces} = lager_mochiglobal:get(loglevel),
@@ -241,7 +269,7 @@ set_loglevel(Handler, Ident, Level) when is_atom(Level) ->
Reply.
%% @doc Get the loglevel for a particular backend. In the case that the backend
-%% has multiple identifiers, the lowest is returned
+%% has multiple identifiers or per module loglevels, the lowest is returned
get_loglevel(Handler) ->
case gen_event:call(lager_event, Handler, get_loglevel, infinity) of
X when is_integer(X) ->
@@ -249,6 +277,15 @@ get_loglevel(Handler) ->
Y -> Y
end.
+%% @doc Get the loglevel for a particular backend and module. In the case that the backend
+%% has multiple identifiers, the lowest is returned
+get_mod_loglevel(Handler, Module) ->
+ case gen_event:call(lager_event, Handler, {get_mod_loglevel, Module}, infinity) of
+ X when is_integer(X) ->
+ lager_util:num_to_level(X);
+ Y -> Y
+ end.
+
%% @doc Try to convert an atom to a posix error, but fall back on printing the
%% term if its not a valid posix error code.
posix_error(Error) when is_atom(Error) ->
View
55 src/lager_console_backend.erl
@@ -24,7 +24,7 @@
-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
code_change/3]).
--record(state, {level, verbose}).
+-record(state, {level, verbose, mod_levels = []}).
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
@@ -37,34 +37,58 @@
init(Level) when is_atom(Level) ->
case lists:member(Level, ?LEVELS) of
true ->
- {ok, #state{level=lager_util:level_to_num(Level), verbose=false}};
+ {ok, #state{level=lager_util:level_to_num(Level), verbose=false, mod_levels = []}};
_ ->
{error, bad_log_level}
end;
init([Level, Verbose]) ->
case lists:member(Level, ?LEVELS) of
true ->
- {ok, #state{level=lager_util:level_to_num(Level), verbose=Verbose}};
+ {ok, #state{level=lager_util:level_to_num(Level), verbose=Verbose, mod_levels = []}};
_ ->
{error, bad_log_level}
end.
%% @private
-handle_call(get_loglevel, #state{level=Level} = State) ->
+handle_call(get_loglevel, #state{level=GenLevel, mod_levels = ModLvls} = State) ->
+ Level = erlang:hd(lists:reverse(lists:sort([GenLevel | [ ModLvl || {_, ModLvl} <- ModLvls ]]))),
{ok, Level, State};
-handle_call({set_loglevel, Level}, State) ->
+handle_call({get_mod_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ case lists:keysearch(Module, 1, ModLvls) of
+ {value, {_, Level}} ->
+ {ok, Level, State};
+ false ->
+ {ok, false, State}
+ end;
+handle_call({set_loglevel, Level, Module}, #state{mod_levels = ModLvls} = State) ->
case lists:member(Level, ?LEVELS) of
true ->
- {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
+ case Module of
+ '_' ->
+ {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
+ _ ->
+ case lists:keymember(Module, 1, ModLvls) of
+ true ->
+ {ok, ok, State#state{mod_levels =
+ lists:keyreplace(Module, 1, ModLvls,
+ {Module, lager_util:level_to_num(Level)})}};
+ false ->
+ {ok, ok, State#state{mod_levels = [{Module, lager_util:level_to_num(Level)}|ModLvls]}}
+ end
+ end;
_ ->
{ok, {error, bad_log_level}, State}
end;
+handle_call({clear_loglevel, '_'}, State) ->
+ {ok, ok, State#state{ mod_levels = [] }};
+handle_call({clear_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ {ok, ok, State#state{ mod_levels = lists:keydelete(Module, 1, ModLvls) }};
handle_call(_Request, State) ->
{ok, ok, State}.
%% @private
-handle_event({log, Dest, Level, {Date, Time}, [LevelStr, Location, Message]},
+handle_event({log_dest, Dest, Level, {Date, Time}, [LevelStr, Location, Message]},
#state{level=L, verbose=Verbose} = State) when Level > L ->
case lists:member(lager_console_backend, Dest) of
true ->
@@ -78,13 +102,18 @@ handle_event({log, Dest, Level, {Date, Time}, [LevelStr, Location, Message]},
false ->
{ok, State}
end;
-handle_event({log, Level, {Date, Time}, [LevelStr, Location, Message]},
- #state{level=LogLevel, verbose=Verbose} = State) when Level =< LogLevel ->
- case Verbose of
+handle_event({log, Module, Level, {Date, Time}, [LevelStr, Location, Message]},
+ #state{level=GenLevel, verbose=Verbose, mod_levels = ModLvls} = State) ->
+ case lager_util:check_loglevel(GenLevel, ModLvls, Module, Level) of
true ->
- io:put_chars(user, [Date, " ", Time, " ", LevelStr, Location, Message, "\r\n"]);
- _ ->
- io:put_chars(user, [Time, " ", LevelStr, Message, "\r\n"])
+ case Verbose of
+ true ->
+ io:put_chars(user, [Date, " ", Time, " ", LevelStr, Location, Message, "\r\n"]);
+ _ ->
+ io:put_chars(user, [Time, " ", LevelStr, Message, "\r\n"])
+ end;
+ false ->
+ ok
end,
{ok, State};
handle_event(_Event, State) ->
View
52 src/lager_file_backend.erl
@@ -44,6 +44,7 @@
-record(state, {
name :: string(),
level :: integer(),
+ mod_levels = [],
fd :: file:io_device(),
inode :: integer(),
flap=false :: boolean(),
@@ -60,12 +61,12 @@ init(LogFile) ->
schedule_rotation(Name, Date),
State = case lager_util:open_logfile(Name, true) of
{ok, {FD, Inode, _}} ->
- #state{name=Name, level=lager_util:level_to_num(Level),
+ #state{name=Name, level=lager_util:level_to_num(Level), mod_levels = [],
fd=FD, inode=Inode, size=Size, date=Date, count=Count};
{error, Reason} ->
?INT_LOG(error, "Failed to open log file ~s with error ~s",
[Name, file:format_error(Reason)]),
- #state{name=Name, level=lager_util:level_to_num(Level),
+ #state{name=Name, level=lager_util:level_to_num(Level), mod_levels = [],
flap=true, size=Size, date=Date, count=Count}
end,
{ok, State};
@@ -74,16 +75,45 @@ init(LogFile) ->
end.
%% @private
-handle_call({set_loglevel, Level}, #state{name=Ident} = State) ->
+handle_call({set_loglevel, Level, Module}, #state{name = Ident, mod_levels = ModLvls} = State) ->
?INT_LOG(notice, "Changed loglevel of ~s to ~p", [Ident, Level]),
- {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
-handle_call(get_loglevel, #state{level=Level} = State) ->
+ case lists:member(Level, ?LEVELS) of
+ true ->
+ case Module of
+ '_' ->
+ {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
+ _ ->
+ case lists:keymember(Module, 1, ModLvls) of
+ true ->
+ {ok, ok, State#state{mod_levels =
+ lists:keyreplace(Module, 1, ModLvls,
+ {Module, lager_util:level_to_num(Level)})}};
+ false ->
+ {ok, ok, State#state{mod_levels = [{Module, lager_util:level_to_num(Level)}|ModLvls]}}
+ end
+ end;
+ _ ->
+ {ok, {error, bad_log_level}, State}
+ end;
+handle_call({clear_loglevel, []}, State) ->
+ {ok, ok, State#state{ mod_levels = [] }};
+handle_call({clear_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ {ok, ok, State#state{ mod_levels = lists:keydelete(Module, 1, ModLvls) }};
+handle_call(get_loglevel, #state{level=GenLevel, mod_levels = ModLvls} = State) ->
+ Level = erlang:hd(lists:reverse(lists:sort([GenLevel | [ ModLvl || {_, ModLvl} <- ModLvls ]]))),
{ok, Level, State};
+handle_call({get_mod_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ case lists:keysearch(Module, 1, ModLvls) of
+ {value, {_, Level}} ->
+ {ok, Level, State};
+ false ->
+ {ok, false, State}
+ end;
handle_call(_Request, State) ->
{ok, ok, State}.
%% @private
-handle_event({log, Dest, Level, {Date, Time}, Message},
+handle_event({log_dest, Dest, Level, {Date, Time}, Message},
#state{name=Name, level=L} = State) when Level > L ->
case lists:member({lager_file_backend, Name}, Dest) of
true ->
@@ -91,8 +121,14 @@ handle_event({log, Dest, Level, {Date, Time}, Message},
false ->
{ok, State}
end;
-handle_event({log, Level, {Date, Time}, Message}, #state{level=L} = State) when Level =< L->
- NewState = write(State, Level, [Date, " ", Time, " ", Message, "\n"]),
+handle_event({log, Module, Level, {Date, Time}, Message},
+ #state{level=GenLevel, mod_levels=ModLvls} = State) ->
+ NewState = case lager_util:check_loglevel(GenLevel, ModLvls, Module, Level) of
+ true ->
+ write(State, Level, [Date, " ", Time, " ", Message, "\n"]);
+ false ->
+ State
+ end,
{ok, NewState};
handle_event(_Event, State) ->
{ok, State}.
View
10 src/lager_util.erl
@@ -18,7 +18,7 @@
-include_lib("kernel/include/file.hrl").
--export([levels/0, level_to_num/1, num_to_level/1, open_logfile/2,
+-export([levels/0, level_to_num/1, num_to_level/1, check_loglevel/4, open_logfile/2,
ensure_logfile/4, rotate_logfile/2, format_time/0, format_time/1,
localtime_ms/0, maybe_utc/1, parse_rotation_date_spec/1,
calculate_next_rotation/1, validate_trace/1, check_traces/4]).
@@ -50,6 +50,14 @@ num_to_level(1) -> alert;
num_to_level(0) -> emergency;
num_to_level(-1) -> none.
+check_loglevel(GenLevel, ModLvls, Module, Level) ->
+ case lists:keysearch(Module, 1, ModLvls) of
+ {value, {_, ModLvl}} ->
+ ModLvl >= Level;
+ false ->
+ GenLevel >= Level
+ end.
+
open_logfile(Name, Buffer) ->
case filelib:ensure_dir(Name) of
ok ->
View
76 test/lager_test_backend.erl
@@ -23,7 +23,7 @@
-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
code_change/3]).
--record(state, {level, buffer, ignored}).
+-record(state, {level, mod_levels, buffer, ignored}).
-compile([{parse_transform, lager_transform}]).
-ifdef(TEST).
@@ -32,7 +32,7 @@
-endif.
init(Level) ->
- {ok, #state{level=lager_util:level_to_num(Level), buffer=[], ignored=[]}}.
+ {ok, #state{level=lager_util:level_to_num(Level), buffer=[], ignored=[], mod_levels=[]}}.
handle_call(count, #state{buffer=Buffer} = State) ->
{ok, length(Buffer), State};
@@ -47,20 +47,48 @@ handle_call(pop, #state{buffer=Buffer} = State) ->
[H|T] ->
{ok, H, State#state{buffer=T}}
end;
-handle_call(get_loglevel, #state{level=Level} = State) ->
+handle_call(get_loglevel, #state{level=GenLevel, mod_levels=ModLvls} = State) ->
+ Level = erlang:hd(lists:reverse(lists:sort([GenLevel | [ ModLvl || {_, ModLvl} <- ModLvls ]]))),
{ok, Level, State};
-handle_call({set_loglevel, Level}, State) ->
- {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
-handle_call(_Request, State) ->
+handle_call({get_mod_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ case lists:keysearch(Module, 1, ModLvls) of
+ {value, {_, Level}} ->
+ {ok, Level, State};
+ false ->
+ {ok, false, State}
+ end;
+handle_call({set_loglevel, Level, Module}, #state{mod_levels = ModLvls} = State) ->
+ case Module of
+ '_' ->
+ {ok, ok, State#state{level=lager_util:level_to_num(Level)}};
+ _ ->
+ case lists:keymember(Module, 1, ModLvls) of
+ true ->
+ {ok, ok, State#state{mod_levels =
+ lists:keyreplace(Module, 1, ModLvls,
+ {Module, lager_util:level_to_num(Level)})}};
+ false ->
+ {ok, ok, State#state{mod_levels = [{Module, lager_util:level_to_num(Level)}|ModLvls]}}
+ end
+ end;
+handle_call({clear_loglevel, '_'}, State) ->
+ {ok, ok, State#state{ mod_levels = [] }};
+handle_call({clear_loglevel, Module}, #state{mod_levels = ModLvls} = State) ->
+ {ok, ok, State#state{ mod_levels = lists:keydelete(Module, 1, ModLvls) }};
+handle_call(Request, State) ->
+ io:format("Request: ~p~n", [Request]),
{ok, ok, State}.
-handle_event({log, [?MODULE], Level, Time, Message}, #state{buffer=Buffer} = State) ->
- {ok, State#state{buffer=Buffer ++ [{Level, Time, Message}]}};
-handle_event({log, Level, Time, Message}, #state{level=LogLevel,
- buffer=Buffer} = State) when Level =< LogLevel ->
+handle_event({log_dest, [?MODULE], Level, Time, Message}, #state{buffer=Buffer} = State) ->
{ok, State#state{buffer=Buffer ++ [{Level, Time, Message}]}};
-handle_event({log, _Level, _Time, _Message}, #state{ignored=Ignored} = State) ->
- {ok, State#state{ignored=Ignored ++ [ignored]}};
+handle_event({log, Module, Level, Time, Message}, #state{level=GenLevel, mod_levels=ModLvls,
+ buffer=Buffer, ignored=Ignored} = State) ->
+ case lager_util:check_loglevel(GenLevel, ModLvls, Module, Level) of
+ true ->
+ {ok, State#state{buffer=Buffer ++ [{Level, Time, Message}]}};
+ false ->
+ {ok, State#state{ignored=Ignored ++ [ignored]}}
+ end;
handle_event(_Event, State) ->
{ok, State}.
@@ -222,6 +250,30 @@ lager_test_() ->
?assertEqual(1, count()),
ok
end
+ },
+ {"per module loglevel works",
+ fun() ->
+ lager:set_loglevel(?MODULE, info),
+ ok = lager:info("Will be logged"),
+ ?assertEqual(1, count()),
+ ?assertEqual(0, count_ignored()),
+ ok = lager:debug("Won't be sent to backend"),
+ ?assertEqual(1, count()),
+ ?assertEqual(0, count_ignored()),
+ lager:set_mod_loglevel(?MODULE, error, ?MODULE),
+ ok = lager:info("Will be ignored because of higher loglevel"),
+ ?assertEqual(1, count()),
+ ?assertEqual(1, count_ignored()),
+ lager:set_mod_loglevel(?MODULE, debug, ?MODULE),
+ ok = lager:debug("Will be logged because of lower loglevel"),
+ ?assertEqual(2, count()),
+ ?assertEqual(1, count_ignored()),
+ lager:clear_mod_loglevel(?MODULE, ?MODULE),
+ ok = lager:debug("Won't be sent to backend"),
+ ?assertEqual(2, count()),
+ ?assertEqual(1, count_ignored()),
+ ok
+ end
}
]
}.
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