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prometheus

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Prometheus.io client in Erlang

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prometheus src prometheus_sup.erl
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src/prometheus_sup.erl 

%%%-------------------------------------------------------------------

%% @doc prometheus top level supervisor.

%% @hidden

%%%-------------------------------------------------------------------



-module(prometheus_sup).



%% API

-export([start_link/0]).

%% Supervisor callbacks

-export([init/1]).



-behaviour(supervisor).



-include("prometheus.hrl").



%%====================================================================

%% Macros

%%====================================================================



-define(SERVER, ?MODULE).



%%====================================================================

%% API functions

%%====================================================================



start_link() ->

  supervisor:start_link({local, ?SERVER}, ?MODULE, []).



%%====================================================================

%% Supervisor callbacks

%%====================================================================



%% Child :: {Id,StartFunc,Restart,Shutdown,Type,Modules}

init([]) ->

  create_tables(),

  register_collectors(),

  register_metrics(),

  setup_instrumenters(),

  {ok, {{one_for_one, 5, 1}, []}}.



%%====================================================================

%% Private Parts

%%====================================================================



create_tables() ->

  Tables = [

            {?PROMETHEUS_REGISTRY_TABLE, {bag, read_concurrency}},

            {?PROMETHEUS_COUNTER_TABLE, write_concurrency},

            {?PROMETHEUS_GAUGE_TABLE, write_concurrency},

            {?PROMETHEUS_SUMMARY_TABLE, write_concurrency},

            {?PROMETHEUS_HISTOGRAM_TABLE, write_concurrency},

            {?PROMETHEUS_BOOLEAN_TABLE, write_concurrency}

           ],

  [maybe_create_table(Name, Concurrency) || {Name, Concurrency} <- Tables],

  ok.



register_collectors() ->

  Collectors = prometheus_collector:enabled_collectors(),

  prometheus_registry:register_collectors(Collectors).



register_metrics() ->

  [declare_metric(Decl) || Decl <- default_metrics()].



setup_instrumenters() ->

  [prometheus_instrumenter:setup(Instrumenter) ||

    Instrumenter <- prometheus_instrumenter:enabled_instrumenters()].



default_metrics() ->

  application:get_env(prometheus, default_metrics, []).



maybe_create_table(Name, {Type, Concurrency}) ->

  case ets:info(Name) of

    undefined ->

      ets:new(Name, [Type, named_table, public, {Concurrency, true}]);

    _ ->

      ok

  end;

maybe_create_table(Name, Concurrency) ->

  maybe_create_table(Name, {set, Concurrency}).



declare_metric({Metric, Spec}) ->

  declare_metric(Metric, Spec);

declare_metric({Registry, Metric, Spec}) ->

  declare_metric(Metric, [{registry, Registry}] ++ Spec).



declare_metric(Metric, Spec) ->

  Module = type_to_module(Metric),

  Module:declare(Spec).



type_to_module(counter) ->

  prometheus_counter;

type_to_module(gauge) ->

  prometheus_gauge;

type_to_module(summary) ->

  prometheus_summary;

type_to_module(histogram) ->

  prometheus_histogram;

type_to_module(boolean) ->

  prometheus_boolean;

type_to_module(Type) ->

  Type.