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Add simple metrics module for use with grapherl

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Christophe Romain 2015-10-22 14:00:17 +02:00
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commit efdf5636be
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%%%-------------------------------------------------------------------
%%% File : mod_metrics.erl
%%% Author : Christophe Romain <christophe.romain@process-one.net>
%%% Purpose : Simple metrics handler for runtime statistics
%%% Created : 22 Oct 2015 by Christophe Romain <christophe.romain@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2015 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%-------------------------------------------------------------------
-module(mod_metrics).
-behaviour(ejabberd_config).
-author('christophe.romain@process-one.net').
-behaviour(gen_mod).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("jlib.hrl").
-define(HOOKS, [offline_message_hook,
sm_register_connection_hook, sm_remove_connection_hook,
user_send_packet, user_receive_packet,
s2s_send_packet, s2s_receive_packet,
remove_user, register_user]).
-export([start/2, stop/1, send_metrics/4]).
-export([offline_message_hook/3,
sm_register_connection_hook/3, sm_remove_connection_hook/3,
user_send_packet/4, user_receive_packet/5,
s2s_send_packet/3, s2s_receive_packet/3,
remove_user/2, register_user/2]).
%%====================================================================
%% API
%%====================================================================
start(Host, _Opts) ->
[ejabberd_hooks:add(Hook, Host, ?MODULE, Hook, 20)
|| Hook <- ?HOOKS].
stop(Host) ->
[ejabberd_hooks:delete(Hook, Host, ?MODULE, Hook, 20)
|| Hook <- ?HOOKS].
%%====================================================================
%% Hooks handlers
%%====================================================================
offline_message_hook(_From, #jid{lserver=LServer}, _Packet) ->
push(LServer, offline_message).
sm_register_connection_hook(_SID, #jid{lserver=LServer}, _Info) ->
push(LServer, sm_register_connection).
sm_remove_connection_hook(_SID, #jid{lserver=LServer}, _Info) ->
push(LServer, sm_remove_connection).
user_send_packet(Packet, _C2SState, #jid{lserver=LServer}, _To) ->
push(LServer, user_send_packet),
Packet.
user_receive_packet(Packet, _C2SState, _JID, _From, #jid{lserver=LServer}) ->
push(LServer, user_receive_packet),
Packet.
s2s_send_packet(#jid{lserver=LServer}, _To, _Packet) ->
push(LServer, s2s_send_packet).
s2s_receive_packet(_From, #jid{lserver=LServer}, _Packet) ->
push(LServer, s2s_receive_packet).
remove_user(_User, Server) ->
push(jlib:nameprep(Server), remove_user).
register_user(_User, Server) ->
push(jlib:nameprep(Server), register_user).
%%====================================================================
%% metrics push handler
%%====================================================================
push(Host, Probe) ->
spawn(?MODULE, send_metrics, [Host, Probe, {127,0,0,1}, 11111]).
send_metrics(Host, Probe, Peer, Port) ->
% our default metrics handler is https://github.com/processone/grapherl
% grapherl metrics are named first with service domain, then nodename
% and name of the data itself, followed by type timestamp and value
% example => process-one.net/xmpp-1.user_receive_packet:c/1441784958:1
[_, NodeId] = str:tokens(jlib:atom_to_binary(node()), <<"@">>),
[Node | _] = str:tokens(NodeId, <<".">>),
BaseId = <<Host/binary, "/", Node/binary, ".">>,
DateTime = erlang:universaltime(),
UnixTime = calendar:datetime_to_gregorian_seconds(DateTime) - 62167219200,
TS = integer_to_binary(UnixTime),
case gen_udp:open(0) of
{ok, Socket} ->
case Probe of
{Key, Val} ->
BVal = integer_to_binary(Val),
Data = <<BaseId/binary, (jlib:atom_to_binary(Key))/binary,
":g/", TS/binary, ":", BVal/binary>>,
gen_udp:send(Socket, Peer, Port, Data);
Key ->
Data = <<BaseId/binary, (jlib:atom_to_binary(Key))/binary,
":c/", TS/binary, ":1">>,
gen_udp:send(Socket, Peer, Port, Data)
end,
gen_udp:close(Socket);
Error ->
?WARNING_MSG("can not open udp socket to grapherl: ~p", [Error])
end.