%%%------------------------------------------------------------------- %%% File : mod_metrics.erl %%% Author : Christophe Romain %%% Purpose : Simple metrics handler for runtime statistics %%% Created : 22 Oct 2015 by Christophe Romain %%% %%% %%% ejabberd, Copyright (C) 2002-2023 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). -author('christophe.romain@process-one.net'). -behaviour(gen_mod). -include("logger.hrl"). -include_lib("xmpp/include/xmpp.hrl"). -include("translate.hrl"). -export([start/2, stop/1, mod_opt_type/1, mod_options/1, depends/2, reload/3]). -export([push/2, mod_doc/0]). -export([offline_message_hook/1, sm_register_connection_hook/3, sm_remove_connection_hook/3, user_send_packet/1, user_receive_packet/1, s2s_send_packet/1, s2s_receive_packet/1, remove_user/2, register_user/2]). -define(SOCKET_NAME, mod_metrics_udp_socket). -define(SOCKET_REGISTER_RETRIES, 10). -type probe() :: atom() | {atom(), integer()}. %%==================================================================== %% API %%==================================================================== start(_Host, _Opts) -> {ok, [{hook, offline_message_hook, offline_message_hook, 20}, {hook, sm_register_connection_hook, sm_register_connection_hook, 20}, {hook, sm_remove_connection_hook, sm_remove_connection_hook, 20}, {hook, user_send_packet, user_send_packet, 20}, {hook, user_receive_packet, user_receive_packet, 20}, {hook, s2s_send_packet, s2s_send_packet, 20}, {hook, s2s_receive_packet, s2s_receive_packet, 20}, {hook, remove_user, remove_user, 20}, {hook, register_user, register_user, 20}]}. stop(_Host) -> ok. reload(_Host, _NewOpts, _OldOpts) -> ok. depends(_Host, _Opts) -> []. %%==================================================================== %% Hooks handlers %%==================================================================== -spec offline_message_hook({any(), message()}) -> {any(), message()}. offline_message_hook({_Action, #message{to = #jid{lserver = LServer}}} = Acc) -> push(LServer, offline_message), Acc. -spec sm_register_connection_hook(ejabberd_sm:sid(), jid(), ejabberd_sm:info()) -> any(). sm_register_connection_hook(_SID, #jid{lserver=LServer}, _Info) -> push(LServer, sm_register_connection). -spec sm_remove_connection_hook(ejabberd_sm:sid(), jid(), ejabberd_sm:info()) -> any(). sm_remove_connection_hook(_SID, #jid{lserver=LServer}, _Info) -> push(LServer, sm_remove_connection). -spec user_send_packet({stanza(), ejabberd_c2s:state()}) -> {stanza(), ejabberd_c2s:state()}. user_send_packet({Packet, #{jid := #jid{lserver = LServer}} = C2SState}) -> push(LServer, user_send_packet), {Packet, C2SState}. -spec user_receive_packet({stanza(), ejabberd_c2s:state()}) -> {stanza(), ejabberd_c2s:state()}. user_receive_packet({Packet, #{jid := #jid{lserver = LServer}} = C2SState}) -> push(LServer, user_receive_packet), {Packet, C2SState}. -spec s2s_send_packet(stanza()) -> stanza(). s2s_send_packet(Packet) -> #jid{lserver = LServer} = xmpp:get_from(Packet), push(LServer, s2s_send_packet), Packet. -spec s2s_receive_packet({stanza(), ejabberd_s2s_in:state()}) -> {stanza(), ejabberd_s2s_in:state()}. s2s_receive_packet({Packet, S2SState}) -> To = xmpp:get_to(Packet), LServer = ejabberd_router:host_of_route(To#jid.lserver), push(LServer, s2s_receive_packet), {Packet, S2SState}. -spec remove_user(binary(), binary()) -> any(). remove_user(_User, Server) -> push(jid:nameprep(Server), remove_user). -spec register_user(binary(), binary()) -> any(). register_user(_User, Server) -> push(jid:nameprep(Server), register_user). %%==================================================================== %% metrics push handler %%==================================================================== -spec push(binary(), probe()) -> ok | {error, not_owner | inet:posix()}. push(Host, Probe) -> IP = mod_metrics_opt:ip(Host), Port = mod_metrics_opt:port(Host), send_metrics(Host, Probe, IP, Port). -spec send_metrics(binary(), probe(), inet:ip4_address(), inet:port_number()) -> ok | {error, not_owner | inet:posix()}. 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 [_, FQDN] = binary:split(misc:atom_to_binary(node()), <<"@">>), [Node|_] = binary:split(FQDN, <<".">>), BaseId = <>, TS = integer_to_binary(erlang:system_time(second)), case get_socket(?SOCKET_REGISTER_RETRIES) of {ok, Socket} -> case Probe of {Key, Val} -> BVal = integer_to_binary(Val), Data = <>, gen_udp:send(Socket, Peer, Port, Data); Key -> Data = <>, gen_udp:send(Socket, Peer, Port, Data) end; Err -> Err end. -spec get_socket(integer()) -> {ok, gen_udp:socket()} | {error, inet:posix()}. get_socket(N) -> case whereis(?SOCKET_NAME) of undefined -> case gen_udp:open(0) of {ok, Socket} -> try register(?SOCKET_NAME, Socket) of true -> {ok, Socket} catch _:badarg when N > 1 -> gen_udp:close(Socket), get_socket(N-1) end; {error, Reason} = Err -> ?ERROR_MSG("Can not open udp socket to grapherl: ~ts", [inet:format_error(Reason)]), Err end; Socket -> {ok, Socket} end. mod_opt_type(ip) -> econf:ipv4(); mod_opt_type(port) -> econf:port(). mod_options(_) -> [{ip, {127,0,0,1}}, {port, 11111}]. mod_doc() -> #{desc => [?T("This module sends events to external backend " "(by now only https://github.com/processone/grapherl" "[grapherl] is supported). Supported events are:"), "", "- sm_register_connection", "", "- sm_remove_connection", "", "- user_send_packet", "", "- user_receive_packet", "", "- s2s_send_packet", "", "- s2s_receive_packet", "", "- register_user", "", "- remove_user", "", "- offline_message", "", ?T("When enabled, every call to these hooks triggers " "a counter event to be sent to the external backend.")], opts => [{ip, #{value => ?T("IPv4Address"), desc => ?T("IPv4 address where the backend is located. " "The default value is '127.0.0.1'.")}}, {port, #{value => ?T("Port"), desc => ?T("An internet port number at which the backend " "is listening for incoming connections/packets. " "The default value is '11111'.")}}]}.