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authorSiri Hansen <siri@erlang.org>2018-09-06 13:51:49 +0200
committerSiri Hansen <siri@erlang.org>2018-09-12 14:58:02 +0200
commita9a72da93e9b93a1d7ee9936b8e223545277480e (patch)
tree9fe33e3c652a9386d18a23355cb533668fdd876b
parent1832ab7dfb86559af2dfc0518669dcdce4f704ee (diff)
downloaderlang-a9a72da93e9b93a1d7ee9936b8e223545277480e.tar.gz
[logger] Refactor, and add error detection for configuration
-rw-r--r--lib/kernel/doc/src/logger.xml2
-rw-r--r--lib/kernel/src/logger.erl153
-rw-r--r--lib/kernel/test/logger_SUITE.erl222
-rw-r--r--lib/kernel/test/logger_simple_h_SUITE.erl3
4 files changed, 310 insertions, 70 deletions
diff --git a/lib/kernel/doc/src/logger.xml b/lib/kernel/doc/src/logger.xml
index a4d6efa2d8..464c65ba76 100644
--- a/lib/kernel/doc/src/logger.xml
+++ b/lib/kernel/doc/src/logger.xml
@@ -527,7 +527,7 @@ start(_, []) ->
Error -> Error
end.</code>
<p>This reads the <c>logger</c> configuration parameter from
- the <c>my_all</c> application and starts the configured
+ the <c>my_app</c> application and starts the configured
handlers. The contents of the configuration use the same
rules as the
<seealso marker="logger_chapter#handler-configuration">logger handler configuration</seealso>.
diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl
index df96367d82..0ada8b4924 100644
--- a/lib/kernel/src/logger.erl
+++ b/lib/kernel/src/logger.erl
@@ -115,6 +115,11 @@
-type config_handler() :: {handler, handler_id(), module(), handler_config()}.
+-type config_logger() :: [{handler,default,undefined} |
+ config_handler() |
+ {filters,log | stop,[{filter_id(),filter()}]} |
+ {module_level,level(),[module()]}].
+
-export_type([log_event/0,
level/0,
report/0,
@@ -582,19 +587,21 @@ get_config() ->
%% tree is started.
internal_init_logger() ->
try
+ Env = get_logger_env(kernel),
+ check_logger_config(kernel,Env),
ok = logger:set_primary_config(level, get_logger_level()),
- ok = logger:set_primary_config(filter_default, get_primary_filter_default()),
+ ok = logger:set_primary_config(filter_default,
+ get_primary_filter_default(Env)),
[case logger:add_primary_filter(Id, Filter) of
ok -> ok;
{error, Reason} -> throw(Reason)
- end || {Id, Filter} <- get_primary_filters()],
+ end || {Id, Filter} <- get_primary_filters(Env)],
- _ = [[case logger:set_module_level(Module, Level) of
- ok -> ok;
- {error, Reason} -> throw(Reason)
- end || Module <- Modules]
- || {module_level, Level, Modules} <- get_logger_env()],
+ [case logger:set_module_level(Modules, Level) of
+ ok -> ok;
+ {error, Reason} -> throw(Reason)
+ end || {module_level, Level, Modules} <- Env],
case logger:set_handler_config(simple,filters,
get_default_handler_filters()) of
@@ -602,24 +609,24 @@ internal_init_logger() ->
{error,{not_found,simple}} -> ok
end,
- init_kernel_handlers()
+ init_kernel_handlers(Env)
catch throw:Reason ->
?LOG_ERROR("Invalid logger config: ~p", [Reason]),
{error, {bad_config, {kernel, Reason}}}
end.
--spec init_kernel_handlers() -> ok | {error,term()}.
+-spec init_kernel_handlers(config_logger()) -> ok | {error,term()}.
%% Setup the kernel environment variables to be correct
%% The actual handlers are started by a call to add_handlers.
-init_kernel_handlers() ->
+init_kernel_handlers(Env) ->
try
- case get_logger_type() of
+ case get_logger_type(Env) of
{ok,silent} ->
ok = logger:remove_handler(simple);
{ok,false} ->
ok;
{ok,Type} ->
- init_default_config(Type)
+ init_default_config(Type,Env)
end
catch throw:Reason ->
?LOG_ERROR("Invalid default handler config: ~p", [Reason]),
@@ -634,10 +641,13 @@ init_kernel_handlers() ->
%% and then starting the correct handlers. This is done after the
%% kernel supervisor tree has been started as it needs the logger_sup.
add_handlers(App) when is_atom(App) ->
- add_handlers(application:get_env(App, logger, []));
+ add_handlers(App,get_logger_env(App));
add_handlers(HandlerConfig) ->
+ add_handlers(application:get_application(),HandlerConfig).
+
+add_handlers(App,HandlerConfig) ->
try
- check_logger_config(HandlerConfig),
+ check_logger_config(App,HandlerConfig),
DefaultAdded =
lists:foldl(
fun({handler, default = Id, Module, Config}, _)
@@ -651,17 +661,22 @@ add_handlers(HandlerConfig) ->
({handler, Id, Module, Config}, Default) ->
setup_handler(Id, Module, Config),
Default orelse Id == default;
- (_, Default) -> Default
+ (_,Default) -> Default
end, false, HandlerConfig),
%% If a default handler was added we try to remove the simple_logger
%% If the simple logger exists it will replay its log events
%% to the handler(s) added in the fold above.
- _ = [case logger:remove_handler(simple) of
- ok -> ok;
- {error,{not_found,simple}} -> ok
- end || DefaultAdded],
+ [case logger:remove_handler(simple) of
+ ok -> ok;
+ {error,{not_found,simple}} -> ok
+ end || DefaultAdded],
ok
- catch throw:Reason ->
+ catch throw:Reason0 ->
+ Reason =
+ case App of
+ undefined -> Reason0;
+ _ -> {App,Reason0}
+ end,
?LOG_ERROR("Invalid logger handler config: ~p", [Reason]),
{error, {bad_config, {handler, Reason}}}
end.
@@ -672,26 +687,35 @@ setup_handler(Id, Module, Config) ->
{error, Reason} -> throw(Reason)
end.
-check_logger_config(_) ->
- ok.
-
--spec get_logger_type() -> {ok, standard_io | false | silent |
- {file, file:name_all()} |
- {file, file:name_all(), [file:mode()]}}.
-get_logger_type() ->
+check_logger_config(_,[]) ->
+ ok;
+check_logger_config(App,[{handler,_,_,_}|Env]) ->
+ check_logger_config(App,Env);
+check_logger_config(kernel,[{handler,default,undefined}|Env]) ->
+ check_logger_config(kernel,Env);
+check_logger_config(kernel,[{filters,_,_}|Env]) ->
+ check_logger_config(kernel,Env);
+check_logger_config(kernel,[{module_level,_,_}|Env]) ->
+ check_logger_config(kernel,Env);
+check_logger_config(_,Bad) ->
+ throw(Bad).
+
+-spec get_logger_type(config_logger()) ->
+ {ok, standard_io | false | silent |
+ {file, file:name_all()} |
+ {file, file:name_all(), [file:mode()]}}.
+get_logger_type(Env) ->
case application:get_env(kernel, error_logger) of
{ok, tty} ->
{ok, standard_io};
{ok, {file, File}} when is_list(File) ->
{ok, {file, File}};
- {ok, {file, File, Modes}} when is_list(File), is_list(Modes) ->
- {ok, {file, File, Modes}};
{ok, false} ->
{ok, false};
{ok, silent} ->
{ok, silent};
undefined ->
- case lists:member({handler,default,undefined}, get_logger_env()) of
+ case lists:member({handler,default,undefined}, Env) of
true ->
{ok, false};
false ->
@@ -709,56 +733,55 @@ get_logger_level() ->
throw({logger_level, Level})
end.
-get_primary_filter_default() ->
- case lists:keyfind(filters,1,get_logger_env()) of
+get_primary_filter_default(Env) ->
+ case lists:keyfind(filters,1,Env) of
{filters,Default,_} ->
Default;
false ->
log
end.
-get_primary_filters() ->
- lists:foldl(
- fun({filters, _, Filters}, _Acc) ->
- Filters;
- (_, Acc) ->
- Acc
- end, [], get_logger_env()).
+get_primary_filters(Env) ->
+ case [F || F={filters,_,_} <- Env] of
+ [{filters,_,Filters}] ->
+ case lists:all(fun({_,_}) -> true; (_) -> false end,Filters) of
+ true -> Filters;
+ false -> throw({invalid_filters,Filters})
+ end;
+ [] -> [];
+ _ -> throw({multiple_filters,Env})
+ end.
%% This function looks at the kernel logger environment
%% and updates it so that the correct logger is configured
-init_default_config(Type) when Type==standard_io;
- Type==standard_error;
- element(1,Type)==file ->
- Env = get_logger_env(),
+init_default_config(Type,Env) when Type==standard_io;
+ Type==standard_error;
+ element(1,Type)==file ->
DefaultFormatter = #{formatter=>{?DEFAULT_FORMATTER,?DEFAULT_FORMAT_CONFIG}},
DefaultConfig = DefaultFormatter#{config=>#{type=>Type}},
NewLoggerEnv =
case lists:keyfind(default, 2, Env) of
- {handler, default, Module, Config} ->
- lists:map(
- fun({handler, default, logger_std_h, _}) ->
- %% Only want to add the logger_std_h config
- %% if not configured by user AND the default
- %% handler is still the logger_std_h.
- {handler, default, Module, maps:merge(DefaultConfig,Config)};
- ({handler, default, logger_disk_log_h, _}) ->
- %% Add default formatter. The point of this
- %% is to get the expected formatter config
- %% for the default handler, since this
- %% differs from the default values that
- %% logger_formatter itself adds.
- {handler, default, logger_disk_log_h, maps:merge(DefaultFormatter,Config)};
- (Other) ->
- Other
- end, Env);
+ {handler, default, logger_std_h, Config} ->
+ %% Only want to add the logger_std_h config
+ %% if not configured by user AND the default
+ %% handler is still the logger_std_h.
+ lists:keyreplace(default, 2, Env,
+ {handler, default, logger_std_h,
+ maps:merge(DefaultConfig,Config)});
+ {handler, default, Module,Config} ->
+ %% Add default formatter. The point of this
+ %% is to get the expected formatter config
+ %% for the default handler, since this
+ %% differs from the default values that
+ %% logger_formatter itself adds.
+ lists:keyreplace(default, 2, Env,
+ {handler, default, Module,
+ maps:merge(DefaultFormatter,Config)});
_ ->
%% Nothing has been configured, use default
[{handler, default, logger_std_h, DefaultConfig} | Env]
end,
- application:set_env(kernel, logger, NewLoggerEnv, [{timeout,infinity}]);
-init_default_config(Type) ->
- throw({illegal_logger_type,Type}).
+ application:set_env(kernel, logger, NewLoggerEnv, [{timeout,infinity}]).
get_default_handler_filters() ->
case application:get_env(kernel, logger_sasl_compatible, false) of
@@ -768,8 +791,8 @@ get_default_handler_filters() ->
?DEFAULT_HANDLER_FILTERS([otp,sasl])
end.
-get_logger_env() ->
- application:get_env(kernel, logger, []).
+get_logger_env(App) ->
+ application:get_env(App, logger, []).
%%%-----------------------------------------------------------------
%%% Internal
diff --git a/lib/kernel/test/logger_SUITE.erl b/lib/kernel/test/logger_SUITE.erl
index 824c95d6df..49b76f03b2 100644
--- a/lib/kernel/test/logger_SUITE.erl
+++ b/lib/kernel/test/logger_SUITE.erl
@@ -37,7 +37,8 @@
suite() ->
- [{timetrap,{seconds,30}}].
+ [{timetrap,{seconds,30}},
+ {ct_hooks,[logger_test_lib]}].
init_per_suite(Config) ->
case logger:get_handler_config(?STANDARD_HANDLER) of
@@ -98,7 +99,9 @@ all() ->
via_logger_process,
other_node,
compare_levels,
- process_metadata].
+ process_metadata,
+ app_config,
+ kernel_config].
start_stop(_Config) ->
S = whereis(logger),
@@ -895,12 +898,227 @@ process_metadata(_Config) ->
ok = logger:unset_process_metadata(),
undefined = logger:get_process_metadata(),
+ ok = logger:update_process_metadata(#{custom=>added_again}),
+ {error,badarg} = ?TRY(logger:update_process_metadata(bad)),
+ #{custom:=added_again} = logger:get_process_metadata(),
+
ok.
process_metadata(cleanup,_Config) ->
logger:remove_handler(h1),
ok.
+app_config(Config) ->
+ %% Start a node with default configuration
+ {ok,_,Node} = logger_test_lib:setup(Config,[]),
+
+ App1Name = app1,
+ App1 = {application, App1Name,
+ [{description, "Test of app with logger config"},
+ {applications, [kernel]}]},
+ ok = rpc:call(Node,application,load,[App1]),
+ ok = rpc:call(Node,application,set_env,
+ [App1Name,logger,[{handler,default,logger_std_h,#{}}]]),
+
+ %% Try to add an own default handler
+ {error,{bad_config,{handler,{app1,{already_exist,default}}}}} =
+ rpc:call(Node,logger,add_handlers,[App1Name]),
+
+ %% Add a different handler
+ ok = rpc:call(Node,application,set_env,[App1Name,logger,
+ [{handler,myh,logger_std_h,#{}}]]),
+ ok = rpc:call(Node,logger,add_handlers,[App1Name]),
+
+ {ok,#{filters:=DF}} = rpc:call(Node,logger,get_handler_config,[default]),
+ {ok,#{filters:=[]}} = rpc:call(Node,logger,get_handler_config,[myh]),
+
+ true = test_server:stop_node(Node),
+
+ %% Start a node with no default handler, then add an own default handler
+ {ok,#{handlers:=[#{id:=simple}]},Node} =
+ logger_test_lib:setup(Config,[{logger,[{handler,default,undefined}]}]),
+
+ ok = rpc:call(Node,application,load,[App1]),
+ ok = rpc:call(Node,application,set_env,
+ [App1Name,logger,[{handler,default,logger_std_h,#{}}]]),
+ ok = rpc:call(Node,logger,add_handlers,[App1Name]),
+
+ #{handlers:=[#{id:=default,filters:=DF}]} =
+ rpc:call(Node,logger,get_config,[]),
+
+ true = test_server:stop_node(Node),
+
+ %% Start a silent node, then add an own default handler
+ {ok,#{handlers:=[]},Node} =
+ logger_test_lib:setup(Config,[{error_logger,silent}]),
+
+ {error,{bad_config,{handler,[{some,bad,config}]}}} =
+ rpc:call(Node,logger,add_handlers,[[{some,bad,config}]]),
+ ok = rpc:call(Node,logger,add_handlers,
+ [[{handler,default,logger_std_h,#{}}]]),
+
+ #{handlers:=[#{id:=default,filters:=DF}]} =
+ rpc:call(Node,logger,get_config,[]),
+
+ ok.
+
+%% This test case is maintly to see code coverage. Note that
+%% logger_env_var_SUITE tests a lot of the same, and checks the
+%% functionality more thoroughly, but since it all happens at node
+%% start, it is not possible to see code coverage in that test.
+kernel_config(Config) ->
+ %% Start a node with simple handler only, then simulate kernel
+ %% start by calling internally exported
+ %% internal_init_logger(). This is to test all variants of kernel
+ %% config, including bad config, and see the code coverage.
+ {ok,#{handlers:=[#{id:=simple,filters:=DF}]}=LC,Node} =
+ logger_test_lib:setup(Config,[{error_logger,false}]),
+
+ %% Same once more, to get coverage
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ LC = rpc:call(Node,logger,get_config,[]),
+
+ %% This shall mean the same as above, but using 'logger' parameter
+ %% instead of 'error_logger'
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{handler,default,undefined}]]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ LC = rpc:call(Node,logger,get_config,[]),
+
+ %% Silent
+ ok = rpc:call(Node,application,unset_env,[kernel,logger]),
+ ok = rpc:call(Node,application,set_env,[kernel,error_logger,silent]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Default
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ ok = rpc:call(Node,application,unset_env,[kernel,logger]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{type:=standard_io}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% error_logger=tty (same as default)
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ ok = rpc:call(Node,application,set_env,[kernel,error_logger,tty]),
+ ok = rpc:call(Node,application,unset_env,[kernel,logger]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{type:=standard_io}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% error_logger={file,File}
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ F = filename:join(?config(priv_dir,Config),
+ atom_to_list(?FUNCTION_NAME)++".log"),
+ ok = rpc:call(Node,application,set_env,[kernel,error_logger,{file,F}]),
+ ok = rpc:call(Node,application,unset_env,[kernel,logger]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{type:={file,F}}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Same, but using 'logger' parameter instead of 'error_logger'
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ ok = rpc:call(Node,application,set_env,[kernel,logger,
+ [{handler,default,logger_std_h,
+ #{config=>#{type=>{file,F}}}}]]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{type:={file,F}}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Same, but with type={file,File,Modes}
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ M = [raw,write,delayed_write],
+ ok = rpc:call(Node,application,set_env,[kernel,logger,
+ [{handler,default,logger_std_h,
+ #{config=>#{type=>{file,F,M}}}}]]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{type:={file,F,M}}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Same, but with disk_log handler
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ M = [raw,write,delayed_write],
+ ok = rpc:call(Node,application,set_env,[kernel,logger,
+ [{handler,default,logger_disk_log_h,
+ #{config=>#{file=>F}}}]]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=log,filters:=[]},
+ handlers:=[#{id:=default,filters:=DF,config:=#{file:=F}}],
+ module_levels:=[]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Set primary filters and module level. No default handler.
+ ok = rpc:call(Node,logger,remove_handler,[default]),% so it can be added again
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{handler,default,undefined},
+ {filters,stop,[{f1,{fun(_,_) -> log end,ok}}]},
+ {module_level,debug,[?MODULE]}]]),
+ ok = rpc:call(Node,logger,internal_init_logger,[]),
+ ok = rpc:call(Node,logger,add_handlers,[kernel]),
+ #{primary:=#{filter_default:=stop,filters:=[_]},
+ handlers:=[],
+ module_levels:=[{?MODULE,debug}]} = rpc:call(Node,logger,get_config,[]),
+
+ %% Bad config
+ ok = rpc:call(Node,application,unset_env,[kernel,logger]),
+
+ ok = rpc:call(Node,application,set_env,[kernel,error_logger,bad]),
+ {error,{bad_config,{kernel,{error_logger,bad}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,unset_env,[kernel,error_logger]),
+ ok = rpc:call(Node,application,set_env,[kernel,logger_level,bad]),
+ {error,{bad_config,{kernel,{logger_level,bad}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,unset_env,[kernel,logger_level]),
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{filters,stop,[bad]}]]),
+ {error,{bad_config,{kernel,{invalid_filters,[bad]}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{filters,stop,[bad]}]]),
+ {error,{bad_config,{kernel,{invalid_filters,[bad]}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{filters,stop,[{f1,bad}]}]]),
+ {error,{bad_config,{kernel,{invalid_filter,{f1,bad}}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,MF=[{filters,stop,[]},{filters,log,[]}]]),
+ {error,{bad_config,{kernel,{multiple_filters,MF}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok = rpc:call(Node,application,set_env,
+ [kernel,logger,[{module_level,bad,[?MODULE]}]]),
+ {error,{bad_config,{kernel,{invalid_level,bad}}}} =
+ rpc:call(Node,logger,internal_init_logger,[]),
+
+ ok.
+
%%%-----------------------------------------------------------------
%%% Internal
check_logged(Level,Format,Args,Meta) ->
diff --git a/lib/kernel/test/logger_simple_h_SUITE.erl b/lib/kernel/test/logger_simple_h_SUITE.erl
index 79e5c057ad..e0ad792bdb 100644
--- a/lib/kernel/test/logger_simple_h_SUITE.erl
+++ b/lib/kernel/test/logger_simple_h_SUITE.erl
@@ -117,8 +117,7 @@ replace_default(Config) ->
log(Node, critical, [?str,[?keyval_rep]]),
log(Node, notice, [["fake",string,"line:",?LINE]]),
- Env = rpc:call(Node, application, get_env, [kernel, logger, []]),
- ok = rpc:call(Node, logger, add_handlers, [Env]),
+ ok = rpc:call(Node, logger, add_handlers, [kernel]),
ok.