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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 

-module(prometheus_sup).

-if(?OTP_RELEASE >= 27).

-define(MODULEDOC(Str), -moduledoc(Str)).

-else.

-define(MODULEDOC(Str), -compile([])).

-endif.



?MODULEDOC(false).



-export([start_link/0]).

-export([init/1]).

-export([register_metrics/1]).



-behaviour(supervisor).



-include("prometheus.hrl").



-spec start_link() -> supervisor:startlink_ret().

start_link() ->

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



-spec init([]) -> {ok, {supervisor:sup_flags(), [supervisor:child_spec()]}}.

init([]) ->

    create_tables(),

    register_collectors(),

    register_metrics(),

    setup_instrumenters(),

    setup_persistent_terms(),

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



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

%% Private Parts

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



create_tables() ->

    Tables = [

        {?PROMETHEUS_REGISTRY_TABLE, [bag, {read_concurrency, true}]},

        {?PROMETHEUS_COUNTER_TABLE, [{write_concurrency, auto}]},

        {?PROMETHEUS_GAUGE_TABLE, [{write_concurrency, auto}]},

        {?PROMETHEUS_SUMMARY_TABLE, [{write_concurrency, auto}]},

        {?PROMETHEUS_QUANTILE_SUMMARY_TABLE, [{read_concurrency, true}, {write_concurrency, auto}]},

        {?PROMETHEUS_HISTOGRAM_TABLE, [{read_concurrency, true}, {write_concurrency, auto}]},

        {?PROMETHEUS_BOOLEAN_TABLE, [{write_concurrency, auto}]}

    ],

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

    ok.



register_collectors() ->

    Collectors = prometheus_collector:enabled_collectors(),

    prometheus_registry:register_collectors(Collectors).



register_metrics() ->

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



-spec register_metrics([dynamic()]) -> [boolean()].

register_metrics(Metrics) ->

    DefaultMetrics0 = default_metrics(),

    DefaultMetrics1 = lists:usort(DefaultMetrics0 ++ Metrics),

    application:set_env(prometheus, default_metrics, DefaultMetrics1),

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



setup_instrumenters() ->

    [

        prometheus_instrumenter:setup(Instrumenter)

     || Instrumenter <- prometheus_instrumenter:enabled_instrumenters()

    ].



default_metrics() ->

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



maybe_create_table(Name, Options) ->

    case ets:info(Name) of

        undefined ->

            ets:new(Name, [named_table, public | Options]);

        _ ->

            ok

    end.



declare_metric({Metric, Spec}) ->

    declare_metric(Metric, Spec);

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

    declare_metric(Metric, prometheus_metric_spec:add_value(registry, Registry, Spec)).



declare_metric(counter, Spec) ->

    prometheus_counter:declare(Spec);

declare_metric(gauge, Spec) ->

    prometheus_gauge:declare(Spec);

declare_metric(summary, Spec) ->

    prometheus_summary:declare(Spec);

declare_metric(histogram, Spec) ->

    prometheus_histogram:declare(Spec);

declare_metric(boolean, Spec) ->

    prometheus_boolean:declare(Spec);

declare_metric(Other, Spec) ->

    Other:declare(Spec).



setup_persistent_terms() ->

    %% See prometheus_text_format:has_special_char/1.

    Pattern = binary:compile_pattern([<<$\\>>, <<$\n>>, <<$">>]),

    ok = persistent_term:put(prometheus_text_format_escape_pattern, Pattern).