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  1. +178 −0 LICENSE
  2. +8 −0 Makefile
  3. +41 −0 README.org
  4. BIN rebar
  5. +2 −0 rebar.config
  6. +18 −0 src/lager.app.src
  7. +109 −0 src/lager.erl
  8. +47 −0 src/lager_console_backend.erl
  9. +165 −0 src/lager_file_backend.erl
  10. +107 −0 src/lager_mochiglobal.erl
  11. +120 −0 src/lager_transform.erl
  12. +41 −0 src/lager_util.erl
178 LICENSE
@@ -0,0 +1,178 @@
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@@ -0,0 +1,8 @@
+all:
+ ./rebar compile
+
+clean:
+ ./rebar clean
+
+test: all
+ ./rebar eunit
@@ -0,0 +1,41 @@
+* Overview
+ Lager (pronounced lAAger) is a logging framework for Erlang. Its purpose is
+ to provide a more traditional way to perform logging in an erlang application
+ that plays nicely with traditional UNIX logging tools like logrotate and
+ syslog.
+
+ Features
+ - Finer grained log levels (debug, info, notice, warning, error, critical,
+ alert, emergency)
+ - Logger calls are transformed using a parse transform to allow capturing
+ Module/Function/Line/Pid information
+ - When no handler is consuming a log level (eg. debug) no event is even sent
+ to the log handler
+ - Supports multiple backends, including console, file and syslog.
+
+* Usage
+ To use lager in your application, you need to define it as a rebar dep or have
+ some other way of including it in erlang's path. You can then add the
+ following option to the erlang compiler flags
+
+ {parse_transform, lager_transform}
+
+ Alternately, you can add it to the module you which to compile with logging
+ enabled:
+
+ -compile([{parse_transform, lager_transform}]).
+
+ Once you have built your code with lager, you can then generate log messages
+ by doing the following:
+
+ lager:error("Some message")
+
+ Or:
+
+ lager:warning("Some message with a term: ~p", [Term])
+
+ The general form is lager:Severity() where Severity is one of the log levels
+ mentioned above.
+
+* Configuration
+ TODO
BIN rebar
Binary file not shown.
@@ -0,0 +1,2 @@
+
+{erl_opts, [debug_info, fail_on_warning]}.
@@ -0,0 +1,18 @@
+%% -*- tab-width: 4;erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+{application, lager,
+ [
+ {description, "Custom error handler"},
+ {vsn, "1.0.0"},
+ {modules, [
+ ]},
+ {applications, [
+ kernel,
+ stdlib,
+ sasl
+ ]},
+ {registered, []},
+ {mod, {riak_err_app, []}},
+ {env, [
+ ]}
+ ]}.
@@ -0,0 +1,109 @@
+%% Copyright (c) 2011 Basho Technologies, Inc. All Rights Reserved.
+%%
+%% This file is provided to you under the Apache License,
+%% Version 2.0 (the "License"); you may not use this file
+%% except in compliance with the License. You may obtain
+%% a copy of the License at
+%%
+%% http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing,
+%% software distributed under the License is distributed on an
+%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+%% KIND, either express or implied. See the License for the
+%% specific language governing permissions and limitations
+%% under the License.
+
+-module(lager).
+
+-behaviour(gen_server).
+
+-export([start_link/0,start/0,sasl_log/3, log/7, log/8]).
+
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
+ code_change/3]).
+
+-record(state, {event_pid, handler_loglevels}).
+
+%% API
+
+start_link() ->
+ %application:start(sasl),
+ %application:set_env(riak_err, print_fun, {lager, sasl_log}),
+ %application:start(riak_err),
+ Handlers = case application:get_env(lager, handlers) of
+ undefined ->
+ [{lager_console_backend, [info]}];
+ Val ->
+ Val
+ end,
+ gen_server:start_link({local, ?MODULE}, ?MODULE, [Handlers], []).
+
+start() ->
+ Handlers = case application:get_env(lager, handlers) of
+ undefined ->
+ [{lager_console_backend, [info]},
+ {lager_file_backend, [{"error.log", error}, {"console.log", info}]}];
+ Val ->
+ Val
+ end,
+ gen_server:start({local, ?MODULE}, ?MODULE, [Handlers], []).
+
+sasl_log(ReportStr, Pid, Message) ->
+ %Level = reportstr_to_level(ReportStr),
+ {{Y, M, D}, {H, Mi, S}} = riak_err_stdlib:maybe_utc(erlang:localtime()),
+ Msg = re:replace(binary:replace(Message, [<<"\r">>, <<"\n">>], <<>>,
+ [global]), " +", " ", [global, {return, binary}]),
+ io:format("~b-~b-~b ~b:~b:~b ~p ~s ~s~n", [Y, M,
+ D, H, Mi, S, Pid, ReportStr, Msg]).
+
+log(Level, Module, Function, Line, Pid, {{Y, M, D}, {H, Mi, S}}, Message) ->
+ Time = io_lib:format("~b-~b-~b ~b:~b:~b", [Y, M, D, H, Mi, S]),
+ Msg = io_lib:format("[~p] ~p@~p:~p:~p ~s", [Level, Pid, Module,
+ Function, Line, Message]),
+ gen_event:notify(lager_event, {log, lager_util:level_to_num(Level), Time, Msg}).
+
+log(Level, Module, Function, Line, Pid, {{Y, M, D}, {H, Mi, S}}, Format, Args) ->
+ Time = io_lib:format("~b-~b-~b ~b:~b:~b", [Y, M, D, H, Mi, S]),
+ Msg = io_lib:format("[~p] ~p@~p:~p:~p ~s", [Level, Pid, Module,
+ Function, Line, io_lib:format(Format, Args)]),
+ gen_event:notify(lager_event, {log, lager_util:level_to_num(Level), Time, Msg}).
+
+%% gen_server callbacks
+
+init([Handlers]) ->
+ %% start a gen_event linked to this process
+ gen_event:start_link({local, lager_event}),
+ %% spin up all the defined handlers
+ [gen_event:add_sup_handler(lager_event, Module, Args) || {Module, Args} <- Handlers],
+ MinLog = minimum_log_level(get_log_levels()),
+ lager_mochiglobal:put(loglevel, MinLog),
+ {ok, #state{}}.
+
+handle_call(_Request, _From, State) ->
+ {reply, ok, State}.
+
+handle_cast(_Request, State) ->
+ {noreply, State}.
+
+handle_info(Info, State) ->
+ io:format("got info ~p~n", [Info]),
+ {noreply, State}.
+
+terminate(_Reason, _State) ->
+ ok.
+
+code_change(_OldVsn, State, _Extra) ->
+ {ok, State}.
+
+
+%% internal functions
+
+get_log_levels() ->
+ [gen_event:call(lager_event, Handler, get_loglevel) ||
+ Handler <- gen_event:which_handlers(lager_event)].
+
+minimum_log_level([]) ->
+ 9; %% higher than any log level, logging off
+minimum_log_level(Levels) ->
+ erlang:hd(lists:sort(lists:map(fun(Level) -> lager_util:level_to_num(Level) end, Levels))).
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