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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at https://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% Copyright (c) 2012-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_osiris_metrics).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
-define(TICK_TIMEOUT, 5000).
-define(SERVER, ?MODULE).
-define(STATISTICS_KEYS,
[policy,
operator_policy,
effective_policy_definition,
state,
leader,
online,
members
]).
-record(state, {timeout :: non_neg_integer()}).
%%----------------------------------------------------------------------------
%% Starts the raw metrics storage and owns the ETS tables.
%%----------------------------------------------------------------------------
-spec start_link() -> rabbit_types:ok_pid_or_error().
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
init([]) ->
Timeout = application:get_env(rabbit, stream_tick_interval,
?TICK_TIMEOUT),
erlang:send_after(Timeout, self(), tick),
{ok, #state{timeout = Timeout}}.
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(tick, #state{timeout = Timeout} = State) ->
Data = osiris_counters:overview(),
maps:map(
fun ({osiris_writer, QName}, #{offset := Offs,
first_offset := FstOffs}) ->
COffs = Offs + 1 - FstOffs,
rabbit_core_metrics:queue_stats(QName, COffs, 0, COffs, 0),
Infos = try
%% TODO complete stats!
case rabbit_amqqueue:lookup(QName) of
{ok, Q} ->
rabbit_stream_queue:info(Q, ?STATISTICS_KEYS);
_ ->
[]
end
catch
_:_ ->
%% It's possible that the writer has died but
%% it's still on the amqqueue record, so the
%% `erlang:process_info/2` calls will return
%% `undefined` and crash with a badmatch.
%% At least for now, skipping the metrics might
%% be the best option. Otherwise this brings
%% down `rabbit_sup` and the whole `rabbit` app.
[]
end,
rabbit_core_metrics:queue_stats(QName, Infos),
rabbit_event:notify(queue_stats, Infos ++ [{name, QName},
{messages, COffs},
{messages_ready, COffs},
{messages_unacknowledged, 0}]),
ok;
(_, _V) ->
ok
end, Data),
erlang:send_after(Timeout, self(), tick),
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
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