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182 рядки
6.4 KiB
182 рядки
6.4 KiB
%% Copyright (c) 2011 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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-module(lager_test_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, buffer, ignored}).
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-compile([{parse_transform, lager_transform}]).
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-ifdef(TEST).
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-include_lib("eunit/include/eunit.hrl").
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-endif.
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init([Level]) ->
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{ok, #state{level=lager_util:level_to_num(Level), buffer=[], ignored=[]}}.
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handle_call(count, #state{buffer=Buffer} = State) ->
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{ok, length(Buffer), State};
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handle_call(count_ignored, #state{ignored=Ignored} = State) ->
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{ok, length(Ignored), State};
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handle_call(pop, #state{buffer=Buffer} = State) ->
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case Buffer of
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[] ->
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{ok, undefined, State};
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[H|T] ->
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{ok, H, State#state{buffer=T}}
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end;
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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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{ok, ok, State#state{level=lager_util:level_to_num(Level)}};
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handle_call(_Request, State) ->
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{ok, ok, State}.
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handle_event({log, Level, Time, Message}, #state{level=LogLevel,
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buffer=Buffer} = State) when Level >= LogLevel ->
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{ok, State#state{buffer=Buffer ++ [{Level, Time, Message}]}};
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handle_event({log, Level, Time, Message}, #state{ignored=Ignored} = State) ->
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{ok, State#state{ignored=Ignored ++ [ignored]}};
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handle_event(_Event, State) ->
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{ok, State}.
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handle_info(_Info, State) ->
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{ok, State}.
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terminate(_Reason, _State) ->
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ok.
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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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pop() ->
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gen_event:call(lager_event, ?MODULE, pop).
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count() ->
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gen_event:call(lager_event, ?MODULE, count).
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count_ignored() ->
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gen_event:call(lager_event, ?MODULE, count_ignored).
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lager_test_() ->
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{foreach,
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fun setup/0,
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fun cleanup/1,
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[
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{"observe that there is nothing up my sleeve",
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fun() ->
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?assertEqual(undefined, pop()),
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?assertEqual(0, count())
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end
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},
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{"logging works",
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fun() ->
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lager:warning("test message"),
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?assertEqual(1, count()),
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{Level, Time, Message} = pop(),
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?assertMatch(Level, lager_util:level_to_num(warning)),
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[LevelStr, LocStr, MsgStr] = re:split(Message, " ", [{return, list}, {parts, 3}]),
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?assertEqual("[warning]", LevelStr),
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?assertEqual("test message", MsgStr),
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ok
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end
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},
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{"logging with arguments works",
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fun() ->
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lager:warning("test message ~p", [self()]),
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?assertEqual(1, count()),
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{Level, Time, Message} = pop(),
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?assertMatch(Level, lager_util:level_to_num(warning)),
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[LevelStr, LocStr, MsgStr] = re:split(Message, " ", [{return, list}, {parts, 3}]),
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?assertEqual("[warning]", LevelStr),
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?assertEqual(lists:flatten(io_lib:format("test message ~p", [self()])), MsgStr),
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ok
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end
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},
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{"logging works from inside a begin/end block",
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fun() ->
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?assertEqual(0, count()),
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begin
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lager:warning("test message 2")
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end,
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?assertEqual(1, count()),
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ok
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end
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},
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{"logging works from inside a list comprehension",
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fun() ->
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?assertEqual(0, count()),
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[lager:warning("test message") || N <- lists:seq(1, 10)],
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?assertEqual(10, count()),
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ok
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end
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},
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{"logging works from a begin/end block inside a list comprehension",
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fun() ->
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?assertEqual(0, count()),
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[ begin lager:warning("test message") end || N <- lists:seq(1, 10)],
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?assertEqual(10, count()),
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ok
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end
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},
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{"logging works from a nested list comprehension",
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fun() ->
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?assertEqual(0, count()),
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[ [lager:warning("test message") || N <- lists:seq(1, 10)] ||
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I <- lists:seq(1, 10)],
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?assertEqual(100, count()),
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ok
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end
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},
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{"log messages below the threshold are ignored",
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fun() ->
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?assertEqual(0, count()),
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lager:debug("this message will be ignored"),
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?assertEqual(0, count()),
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?assertEqual(0, count_ignored()),
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lager_mochiglobal:put(loglevel, 0),
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lager:debug("this message should be ignored"),
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?assertEqual(0, count()),
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?assertEqual(1, count_ignored()),
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lager:set_loglevel(?MODULE, debug),
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lager:debug("this message should be logged"),
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?assertEqual(1, count()),
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?assertEqual(1, count_ignored()),
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?assertEqual(debug, lager:get_loglevel(?MODULE)),
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ok
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end
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}
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]
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}.
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setup() ->
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application:load(lager),
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application:set_env(lager, handlers, [{?MODULE, [info]}]),
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application:start(lager).
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cleanup(_) ->
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application:stop(lager),
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application:unload(lager).
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-endif.
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