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274 行
11 KiB
274 行
11 KiB
%% Copyright (c) 2011-2012 Basho Technologies, Inc. All Rights Reserved.
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%%
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%% This file is provided to you under the Apache License,
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%% Version 2.0 (the "License"); you may not use this file
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%% except in compliance with the License. You may obtain
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%% a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing,
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%% software distributed under the License is distributed on an
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%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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%% KIND, either express or implied. See the License for the
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%% specific language governing permissions and limitations
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%% under the License.
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%% @doc Console backend for lager. Configured with a single option, the loglevel
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%% desired.
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-module(lager_console_backend).
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-behaviour(gen_event).
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-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
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code_change/3]).
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-record(state, {level, formatter,format_config}).
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-ifdef(TEST).
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-include_lib("eunit/include/eunit.hrl").
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-compile([{parse_transform, lager_transform}]).
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-endif.
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-include("lager.hrl").
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-define(TERSE_FORMAT,[time, " [", severity,"] ", message, "\r\n"]).
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%% @private
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init(Level) when is_atom(Level) ->
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init([Level,{lager_default_formatter,?TERSE_FORMAT}]);
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init([Level, true]) -> % for backwards compatibility
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init([Level,{lager_default_formatter,[{eol, "\r\n"}]}]);
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init([Level,false]) -> % for backwards compatibility
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init([Level,{lager_default_formatter,?TERSE_FORMAT}]);
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init([Level,{Formatter,FormatterConfig}]) when is_atom(Level), is_atom(Formatter)->
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case lists:member(Level, ?LEVELS) of
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true ->
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{ok, #state{level=lager_util:level_to_num(Level),
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formatter=Formatter,
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format_config=FormatterConfig}};
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_ ->
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{error, bad_log_level}
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end.
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%% @private
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handle_call(get_loglevel, #state{level=Level} = State) ->
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{ok, Level, State};
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handle_call({set_loglevel, Level}, State) ->
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case lists:member(Level, ?LEVELS) of
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true ->
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{ok, ok, State#state{level=lager_util:level_to_num(Level)}};
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_ ->
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{ok, {error, bad_log_level}, State}
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end;
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handle_call(_Request, State) ->
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{ok, ok, State}.
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%% @private
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handle_event({log, Message},
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#state{level=L,formatter=Formatter,format_config=FormatConfig} = State) ->
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case lager_util:is_loggable(Message, L, ?MODULE) of
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true ->
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io:put_chars(user, Formatter:format(Message,FormatConfig)),
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{ok, State};
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false ->
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{ok, State}
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end;
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handle_event(_Event, State) ->
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{ok, State}.
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%% @private
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handle_info(_Info, State) ->
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{ok, State}.
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%% @private
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terminate(_Reason, _State) ->
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ok.
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%% @private
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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-ifdef(TEST).
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console_log_test_() ->
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%% tiny recursive fun that pretends to be a group leader
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F = fun(Self) ->
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fun() ->
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YComb = fun(Fun) ->
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receive
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{io_request, From, ReplyAs, {put_chars, unicode, _Msg}} = Y ->
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From ! {io_reply, ReplyAs, ok},
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Self ! Y,
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Fun(Fun);
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Other ->
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?debugFmt("unexpected message ~p~n", [Other]),
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Self ! Other
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end
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end,
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YComb(YComb)
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end
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end,
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{foreach,
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fun() ->
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error_logger:tty(false),
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application:load(lager),
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application:set_env(lager, handlers, []),
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application:set_env(lager, error_logger_redirect, false),
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application:start(compiler),
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application:start(syntax_tools),
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application:start(lager),
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whereis(user)
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end,
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fun(User) ->
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unregister(user),
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register(user, User),
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application:stop(lager),
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error_logger:tty(true)
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end,
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[
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{"regular console logging",
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fun() ->
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Pid = spawn(F(self())),
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gen_event:add_handler(lager_event, lager_console_backend, info),
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unregister(user),
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register(user, Pid),
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erlang:group_leader(Pid, whereis(lager_event)),
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lager_mochiglobal:put(loglevel, {?INFO, []}),
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lager:log(info, self(), "Test message"),
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receive
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{io_request, From, ReplyAs, {put_chars, unicode, Msg}} ->
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From ! {io_reply, ReplyAs, ok},
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?assertMatch([_, "[info]", "Test message\r\n"], re:split(Msg, " ", [{return, list}, {parts, 3}]))
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after
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500 ->
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?assert(false)
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end
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end
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},
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{"verbose console logging",
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fun() ->
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Pid = spawn(F(self())),
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unregister(user),
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register(user, Pid),
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erlang:group_leader(Pid, whereis(lager_event)),
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gen_event:add_handler(lager_event, lager_console_backend, [info, true]),
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lager_mochiglobal:put(loglevel, {?INFO, []}),
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lager:info("Test message"),
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lager:info("Test message"),
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PidStr = pid_to_list(self()),
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receive
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{io_request, _, _, {put_chars, unicode, Msg}} ->
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?assertMatch([_, _, "[info]", PidStr, _,"Test message\r\n"], re:split(Msg, "[ @]", [{return, list}, {parts, 6}]))
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after
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500 ->
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?assert(false)
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end
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end
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},
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{"tracing should work",
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fun() ->
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Pid = spawn(F(self())),
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unregister(user),
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register(user, Pid),
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gen_event:add_handler(lager_event, lager_console_backend, info),
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erlang:group_leader(Pid, whereis(lager_event)),
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lager_mochiglobal:put(loglevel, {?INFO, []}),
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lager:debug("Test message"),
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receive
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{io_request, From, ReplyAs, {put_chars, unicode, _Msg}} ->
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From ! {io_reply, ReplyAs, ok},
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?assert(false)
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after
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500 ->
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?assert(true)
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end,
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{ok, _} = lager:trace_console([{module, ?MODULE}]),
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lager:debug("Test message"),
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receive
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{io_request, From1, ReplyAs1, {put_chars, unicode, Msg1}} ->
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From1 ! {io_reply, ReplyAs1, ok},
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?assertMatch([_, "[debug]", "Test message\r\n"], re:split(Msg1, " ", [{return, list}, {parts, 3}]))
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after
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500 ->
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?assert(false)
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end
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end
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},
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{"tracing doesn't duplicate messages",
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fun() ->
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Pid = spawn(F(self())),
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unregister(user),
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register(user, Pid),
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gen_event:add_handler(lager_event, lager_console_backend, info),
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lager_mochiglobal:put(loglevel, {?INFO, []}),
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erlang:group_leader(Pid, whereis(lager_event)),
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lager:debug("Test message"),
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receive
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{io_request, From, ReplyAs, {put_chars, unicode, _Msg}} ->
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From ! {io_reply, ReplyAs, ok},
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?assert(false)
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after
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500 ->
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?assert(true)
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end,
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{ok, _} = lager:trace_console([{module, ?MODULE}]),
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lager:error("Test message"),
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receive
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{io_request, From1, ReplyAs1, {put_chars, unicode, Msg1}} ->
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From1 ! {io_reply, ReplyAs1, ok},
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?assertMatch([_, "[error]", "Test message\r\n"], re:split(Msg1, " ", [{return, list}, {parts, 3}]))
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after
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1000 ->
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?assert(false)
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end,
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%% make sure this event wasn't duplicated
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receive
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{io_request, From2, ReplyAs2, {put_chars, unicode, _Msg2}} ->
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From2 ! {io_reply, ReplyAs2, ok},
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?assert(false)
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after
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500 ->
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?assert(true)
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end
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end
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}
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]
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}.
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set_loglevel_test_() ->
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{foreach,
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fun() ->
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error_logger:tty(false),
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application:load(lager),
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application:set_env(lager, handlers, [{lager_console_backend, info}]),
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application:set_env(lager, error_logger_redirect, false),
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application:start(lager)
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end,
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fun(_) ->
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application:stop(lager),
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error_logger:tty(true)
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end,
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[
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{"Get/set loglevel test",
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fun() ->
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?assertEqual(info, lager:get_loglevel(lager_console_backend)),
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lager:set_loglevel(lager_console_backend, debug),
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?assertEqual(debug, lager:get_loglevel(lager_console_backend))
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end
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},
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{"Get/set invalid loglevel test",
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fun() ->
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?assertEqual(info, lager:get_loglevel(lager_console_backend)),
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?assertEqual({error, bad_log_level},
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lager:set_loglevel(lager_console_backend, fatfinger)),
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?assertEqual(info, lager:get_loglevel(lager_console_backend))
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end
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}
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]
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}.
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-endif.
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