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115 lines
3.7 KiB
115 lines
3.7 KiB
-module(lager_common_test_backend).
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-behavior(gen_event).
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%% gen_event callbacks
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-export([init/1,
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handle_call/2,
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handle_event/2,
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handle_info/2,
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terminate/2,
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code_change/3]).
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-export([get_logs/0,
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bounce/0,
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bounce/1]).
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%% holds the log messages for retreival on terminate
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-record(state, {level :: {mask, integer()},
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formatter :: atom(),
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format_config :: any(),
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log = [] :: list()}).
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-include("lager.hrl").
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-define(TERSE_FORMAT,[time, " ", color, "[", severity,"] ", message]).
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%% @doc Before every test, just
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%% lager_common_test_backend:bounce(Level) with the log level of your
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%% choice. Every message will be passed along to ct:pal for your
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%% viewing in the common_test reports. Also, you can call
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%% lager_common_test_backend:get_logs/0 to get a list of all log
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%% messages this backend has received during your test. You can then
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%% search that list for expected log messages.
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-spec get_logs() -> [iolist()] | {error, term()}.
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get_logs() ->
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gen_event:call(lager_event, ?MODULE, get_logs, infinity).
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bounce() ->
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bounce(error).
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bounce(Level) ->
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_ = application:stop(lager),
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lager:start(),
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gen_event:add_handler(lager_event, lager_common_test_backend, [Level, false]),
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%lager:set_loglevel(lager_common_test_backend, Level),
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ok.
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-spec(init(integer()|atom()|[term()]) -> {ok, #state{}} | {error, atom()}).
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%% @private
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%% @doc Initializes the event handler
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init([Level, true]) -> % for backwards compatibility
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init([Level,{lager_default_formatter,[{eol, "\n"}]}]);
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init([Level,false]) -> % for backwards compatibility
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init([Level,{lager_default_formatter,?TERSE_FORMAT ++ ["\n"]}]);
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init([Level,{Formatter,FormatterConfig}]) when 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:config_to_mask(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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init(Level) ->
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init([Level,{lager_default_formatter,?TERSE_FORMAT ++ ["\n"]}]).
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-spec(handle_event(tuple(), #state{}) -> {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,log=Logs} = State) ->
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case lager_util:is_loggable(Message,L,?MODULE) of
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true ->
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Log = Formatter:format(Message,FormatConfig),
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ct:pal(Log),
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{ok, State#state{log=[Log|Logs]}};
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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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ct:pal(Event),
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{ok, State#state{log = [Event|State#state.log]}}.
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-spec(handle_call(any(), #state{}) -> {ok, any(), #state{}}).
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%% @private
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%% @doc gets and sets loglevel. This is part of the lager backend api.
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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:config_to_mask(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(get_logs, #state{log = Logs} = State) ->
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{ok, lists:reverse(Logs), State};
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handle_call(_, State) ->
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{ok, ok, State}.
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-spec(handle_info(any(), #state{}) -> {ok, #state{}}).
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%% @private
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%% @doc gen_event callback, does nothing.
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handle_info(_, State) ->
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{ok, State}.
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-spec(code_change(any(), #state{}, any()) -> {ok, #state{}}).
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%% @private
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%% @doc gen_event callback, does nothing.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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-spec(terminate(any(), #state{}) -> {ok, list()}).
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%% @doc gen_event callback, does nothing.
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terminate(_Reason, #state{log=Logs}) ->
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{ok, lists:reverse(Logs)}.
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