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lager_logstash_backend.erl
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-module(lager_logstash_backend).
%% Started from the lager logstash backend
-author('[email protected]').
-author('[email protected]').
-behaviour(gen_event).
-export([init/1,
handle_call/2,
handle_event/2,
handle_info/2,
terminate/2,
code_change/3,
logtime/0,
get_app_version/0
]).
-record(state, {socket :: pid(),
lager_level_type :: 'mask' | 'number' | 'unknown',
level :: atom(),
logstash_host :: string(),
logstash_port :: number(),
logstash_address :: inet:ip_address(),
node_name :: string(),
node_role :: string(),
node_version :: string(),
metadata :: list()
}).
init(Params) ->
%% we need the lager version, but we aren't loaded, so... let's try real hard
%% this is obviously too fragile
{ok, Properties} = application:get_all_key(),
{vsn, Lager_Version} = proplists:lookup(vsn, Properties),
Lager_Level_Type =
case string:to_float(Lager_Version) of
{V1, _} when V1 < 2.0 ->
'number';
{V2, _} when V2 =:= 2.0 ->
'mask';
{_, _} ->
'unknown'
end,
Level = lager_util:level_to_num(proplists:get_value(level, Params, debug)),
Popcorn_Host = proplists:get_value(logstash_host, Params, "localhost"),
Popcorn_Port = proplists:get_value(logstash_port, Params, 9125),
Node_Name = proplists:get_value(node_name, Params, "no_name"),
Node_Role = proplists:get_value(node_role, Params, "no_role"),
Node_Version = proplists:get_value(node_version, Params, "no_version"),
Metadata = proplists:get_value(metadata, Params, []) ++
[
{pid, [{encoding, process}]},
{line, [{encoding, integer}]},
{file, [{encoding, string}]},
{module, [{encoding, atom}]}
],
{Socket, Address} =
case inet:getaddr(Popcorn_Host, inet) of
{ok, Addr} ->
{ok, Sock} = gen_udp:open(0, [list]),
{Sock, Addr};
{error, _Err} ->
{undefined, undefined}
end,
{ok, #state{socket = Socket,
lager_level_type = Lager_Level_Type,
level = Level,
logstash_host = Popcorn_Host,
logstash_port = Popcorn_Port,
logstash_address = Address,
node_name = Node_Name,
node_role = Node_Role,
node_version = Node_Version,
metadata = Metadata}}.
handle_call({set_loglevel, Level}, State) ->
{ok, ok, State#state{level=lager_util:level_to_num(Level)}};
handle_call(get_loglevel, State) ->
{ok, State#state.level, State};
handle_call(_Request, State) ->
{ok, ok, State}.
handle_event({log, _}, #state{socket=S}=State) when S =:= undefined ->
{ok, State};
handle_event({log, {lager_msg, Q, Metadata, Severity, {Date, Time}, _, Message}}, State) ->
handle_event({log, {lager_msg, Q, Metadata, Severity, {Date, Time}, Message}}, State);
handle_event({log, {lager_msg, _, Metadata, Severity, {Date, Time}, Message}}, #state{level=L, metadata=Config_Meta}=State) ->
case lager_util:level_to_num(Severity) =< L of
true ->
Encoded_Message = encode_json_event(State#state.lager_level_type,
node(),
State#state.node_name,
State#state.node_role,
State#state.node_version,
Severity,
Date,
Time,
Message,
metadata(Metadata, Config_Meta)),
gen_udp:send(State#state.socket,
State#state.logstash_address,
State#state.logstash_port,
Encoded_Message);
_ ->
ok
end,
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
handle_info(_Info, State) ->
{ok, State}.
terminate(_Reason, #state{socket=S}=State) ->
gen_udp:close(S),
ok;
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
%% TODO version number should be read here, or else we don't support upgrades
Vsn = get_app_version(),
{ok, State#state{node_version=Vsn}}.
encode_json_event('mask', Node, Node_Name, Node_Role, Node_Version, Severity, _Date, _Time, Message, Metadata) ->
jiffy:encode({[
{<<"fields">>,
{[
{<<"level">>, Severity},
{<<"node_name">>, list_to_binary(Node_Name)},
{<<"node_role">>, list_to_binary(Node_Role)},
{<<"node_version">>, list_to_binary(Node_Version)},
{<<"node">>, Node}
] ++ Metadata }
},
{<<"@timestamp">>, list_to_binary(logtime())}, %% use the logstash timestamp
{<<"message">>, safe_list_to_binary(Message)},
{<<"type">>, <<"erlang">>}
]
}).
safe_list_to_binary(L) when is_list(L) ->
unicode:characters_to_binary(L);
safe_list_to_binary(L) when is_binary(L) ->
unicode:characters_to_binary(L).
get_app_version() ->
[App,_Host] = string:tokens(atom_to_list(node()), "@"),
Apps = application:which_applications(),
case proplists:lookup(list_to_atom(App), Apps) of
none ->
"no_version";
{_, _, V} ->
V
end.
logtime() ->
{{Year, Month, Day}, {Hour, Minute, Second}} = erlang:universaltime(),
lists:flatten(io_lib:format("~4.10.0B-~2.10.0B-~2.10.0BT~2.10.0B:~2.10.0B:~2.10.0B.~.10.0BZ",
[Year, Month, Day, Hour, Minute, Second, 0])).
metadata(Metadata, Config_Meta) ->
Expanded = [{Name, Properties, proplists:get_value(Name, Metadata)} || {Name, Properties} <- Config_Meta],
[{list_to_binary(atom_to_list(Name)), encode_value(Value, proplists:get_value(encoding, Properties))} || {Name, Properties, Value} <- Expanded, Value =/= undefined].
encode_value(Val, string) when is_list(Val) -> list_to_binary(Val);
encode_value(Val, string) when is_atom(Val) -> list_to_binary(atom_to_list(Val));
encode_value(Val, binary) -> Val;
encode_value(Val, process) when is_pid(Val) -> list_to_binary(pid_to_list(Val));
encode_value(Val, process) when is_list(Val) -> list_to_binary(Val);
encode_value(Val, integer) -> list_to_binary(integer_to_list(Val));
encode_value(Val, atom) -> list_to_binary(atom_to_list(Val));
encode_value(_Val, undefiend) -> throw(encoding_error).