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prometheus_cowboy

0.1.2
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Cowboy exporter for the prometheus.erl client

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prometheus_cowboy src prometheus_cowboy.erl
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src/prometheus_cowboy.erl 

-module(prometheus_cowboy).



-behaviour(application).

-export([start/2, stop/1]).

-behaviour(supervisor).

-export([init/1]).



-export([to_cowboy_headers/1]).



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

%% Application & supervisor callbacks

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



start(_, _) ->

  case code:ensure_loaded(cowboy_metrics_h) of

    {module, _} -> prometheus_cowboy2_instrumenter:setup();

    _ -> ok

  end,

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



stop(_) -> ok.



init([]) ->

  {ok, {{one_for_one, 0, 1}, []}}.



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

%% API

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



to_cowboy_headers(RespHeaders) ->

  lists:map(fun to_cowboy_headers_/1, RespHeaders).



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

%% Private functions

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



to_cowboy_headers_({Name, Value}) ->

  {to_cowboy_name(Name), Value}.



to_cowboy_name(Name) ->

  binary:replace(atom_to_binary(Name, utf8), <<"_">>, <<"-">>).