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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_writer_syslog).
-behavior(couch_log_writer).
-export([
init/0,
terminate/2,
write/2
]).
-include("couch_log.hrl").
-record(st, {
socket,
host,
port,
hostname,
os_pid,
appid,
facility
}).
-define(SYSLOG_VERSION, 1).
-ifdef(TEST).
-export([
get_facility/1,
get_level/1
]).
-endif.
init() ->
{ok, Socket} = gen_udp:open(0),
Host = case config:get("log", "syslog_host") of
undefined ->
undefined;
SysLogHost ->
case inet:getaddr(SysLogHost, inet) of
{ok, Address} ->
Address;
_ ->
undefined
end
end,
{ok, #st{
socket = Socket,
host = Host,
port = config:get_integer("log", "syslog_port", 514),
hostname = net_adm:localhost(),
os_pid = os:getpid(),
appid = config:get("log", "syslog_appid", "couchdb"),
facility = get_facility(config:get("log", "syslog_facility", "local2"))
}}.
terminate(_Reason, St) ->
gen_udp:close(St#st.socket).
write(Entry, St) ->
#log_entry{
level = Level,
pid = Pid,
msg = Msg,
msg_id = MsgId,
time_stamp = TimeStamp
} = Entry,
Fmt = "<~B>~B ~s ~s ~s ~p ~s - ",
Args = [
St#st.facility bor get_level(Level),
?SYSLOG_VERSION,
TimeStamp,
St#st.hostname,
St#st.appid,
Pid,
MsgId
],
Pre = io_lib:format(Fmt, Args),
ok = send(St, [Pre, Msg, $\n]),
{ok, St}.
send(#st{host=undefined}, Packet) ->
io:format(standard_error, "~s", [Packet]);
send(St, Packet) ->
#st{
socket = Socket,
host = Host,
port = Port
} = St,
gen_udp:send(Socket, Host, Port, Packet).
get_facility(Name) ->
FacId = case Name of
"kern" -> 0; % Kernel messages
"user" -> 1; % Random user-level messages
"mail" -> 2; % Mail system
"daemon" -> 3; % System daemons
"auth" -> 4; % Security/Authorization messages
"syslog" -> 5; % Internal Syslog messages
"lpr" -> 6; % Line printer subsystem
"news" -> 7; % Network news subsystems
"uucp" -> 8; % UUCP subsystem
"clock" -> 9; % Clock daemon
"authpriv" -> 10; % Security/Authorization messages
"ftp" -> 11; % FTP daemon
"ntp" -> 12; % NTP subsystem
"audit" -> 13; % Log audit
"alert" -> 14; % Log alert
"cron" -> 15; % Scheduling daemon
"local0" -> 16; % Local use 0
"local1" -> 17; % Local use 1
"local2" -> 18; % Local use 2
"local3" -> 19; % Local use 3
"local4" -> 20; % Local use 4
"local5" -> 21; % Local use 5
"local6" -> 22; % Local use 6
"local7" -> 23; % Local use 7
_ ->
try list_to_integer(Name) of
N when N >= 0, N =< 23 -> N;
_ -> 23
catch _:_ ->
23
end
end,
FacId bsl 3.
get_level(Name) when is_atom(Name) ->
case Name of
debug -> 7;
info -> 6;
notice -> 5;
warning -> 4;
error -> 3;
critical -> 2;
alert -> 1;
emergency -> 0;
_ -> 3
end.
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