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% Licensed 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(couch_log).
-behaviour(gen_event).
-export([start_link/0,stop/0]).
-export([debug_on/0,info_on/0,get_level/0,get_level_integer/0, set_level/1]).
-export([init/1, handle_event/2, terminate/2, code_change/3, handle_info/2, handle_call/2]).
-export([read/2]).
-define(LEVEL_ERROR, 3).
-define(LEVEL_INFO, 2).
-define(LEVEL_DEBUG, 1).
-define(LEVEL_TMI, 0).
level_integer(error) -> ?LEVEL_ERROR;
level_integer(info) -> ?LEVEL_INFO;
level_integer(debug) -> ?LEVEL_DEBUG;
level_integer(tmi) -> ?LEVEL_TMI;
level_integer(_Else) -> ?LEVEL_ERROR. % anything else default to ERROR level
level_atom(?LEVEL_ERROR) -> error;
level_atom(?LEVEL_INFO) -> info;
level_atom(?LEVEL_DEBUG) -> debug;
level_atom(?LEVEL_TMI) -> tmi.
start_link() ->
couch_event_sup:start_link({local, couch_log}, error_logger, couch_log, []).
stop() ->
couch_event_sup:stop(couch_log).
init([]) ->
% read config and register for configuration changes
% just stop if one of the config settings change. couch_server_sup
% will restart us and then we will pick up the new settings.
ok = couch_config:register(
fun("log", "file") ->
?MODULE:stop();
("log", "level") ->
?MODULE:stop()
end),
Filename = couch_config:get("log", "file", "couchdb.log"),
Level = couch_config:get("log", "level", "info"),
{ok, Fd} = file:open(Filename, [append]),
{ok, {Fd, level_integer(list_to_atom(Level))}}.
debug_on() ->
get_level_integer() =< ?LEVEL_DEBUG.
info_on() ->
get_level_integer() =< ?LEVEL_INFO.
set_level(LevelAtom) ->
set_level_integer(level_integer(LevelAtom)).
get_level() ->
level_atom(get_level_integer()).
get_level_integer() ->
catch gen_event:call(error_logger, couch_log, get_level_integer).
set_level_integer(Int) ->
gen_event:call(error_logger, couch_log, {set_level_integer, Int}).
handle_event({error_report, _, {Pid, couch_error, {Format, Args}}}, {Fd, _LogLevel}=State) ->
log(Fd, Pid, error, Format, Args),
{ok, State};
handle_event({error_report, _, {Pid, _, _}}=Event, {Fd, _LogLevel}=State) ->
log(Fd, Pid, error, "~p", [Event]),
{ok, State};
handle_event({error, _, {Pid, Format, Args}}, {Fd, _LogLevel}=State) ->
log(Fd, Pid, error, Format, Args),
{ok, State};
handle_event({info_report, _, {Pid, couch_info, {Format, Args}}}, {Fd, LogLevel}=State)
when LogLevel =< ?LEVEL_INFO ->
log(Fd, Pid, info, Format, Args),
{ok, State};
handle_event({info_report, _, {Pid, couch_debug, {Format, Args}}}, {Fd, LogLevel}=State)
when LogLevel =< ?LEVEL_DEBUG ->
log(Fd, Pid, debug, Format, Args),
{ok, State};
handle_event({_, _, {Pid, _, _}}=Event, {Fd, LogLevel}=State)
when LogLevel =< ?LEVEL_TMI ->
% log every remaining event if tmi!
log(Fd, Pid, tmi, "~p", [Event]),
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
handle_call(get_level_integer, {_Fd, LogLevel}=State) ->
{ok, LogLevel, State};
handle_call({set_level_integer, NewLevel}, {Fd, _LogLevel}) ->
{ok, ok, {Fd, NewLevel}}.
handle_info(_Info, State) ->
{ok, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Arg, {Fd, _LoggingLevel}) ->
file:close(Fd).
log(Fd, Pid, Level, Format, Args) ->
Msg = io_lib:format(Format, Args),
ok = io:format("[~s] [~p] ~s~n", [Level, Pid, Msg]), % dump to console too
Msg2 = re:replace(lists:flatten(Msg),"\\r\\n|\\r|\\n", "\r\n",
[global, {return, list}]),
ok = io:format(Fd, "[~s] [~s] [~p] ~s\r~n\r~n", [httpd_util:rfc1123_date(), Level, Pid, Msg2]).
read(Bytes, Offset) ->
LogFileName = couch_config:get("log", "file"),
LogFileSize = couch_util:file_read_size(LogFileName),
{ok, Fd} = file:open(LogFileName, [read]),
Start = lists:max([LogFileSize - Bytes, 0]) + Offset,
% TODO: truncate chopped first line
% TODO: make streaming
{ok, Chunk} = file:pread(Fd, Start, LogFileSize),
Chunk.
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