brucke

%%%
%%%   Copyright (c) 2017 Klarna AB
%%%
%%%   Licensed under the Apache License, Version 2.0 (the "License");
%%%   you may not use this file except in compliance with the License.
%%%   You may obtain a copy of the License at
%%%
%%%       http://www.apache.org/licenses/LICENSE-2.0
%%%
%%%   Unless required by applicable law or agreed to in writing, software
%%%   distributed under the License is distributed on an "AS IS" BASIS,
%%%   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%%   See the License for the specific language governing permissions and
%%%   limitations under the License.
%%%
-module(brucke_http).

%% API
-export([init/0]).

init() ->
  case brucke_app:http_port() of
    undefined ->
      %% not configured, do not start anything
      ok;
    Port ->
      Dispatch = cowboy_router:compile([{'_',
                                         [ {"/ping", brucke_http_ping_handler, []}
                                         , {"/", brucke_http_healthcheck_handler, []}
                                         , {"/healthcheck", brucke_http_healthcheck_handler, []}
                                         ]}]),
      lager:info("Starting http listener on port ~p", [Port]),
      case cowboy:start_http(http, 8, [{port, Port}],
                                  [ {env, [{dispatch, Dispatch}]}
                                  , {onresponse, fun error_hook/4}]) of
        {ok, _Pid} ->
          ok;
        {error, {already_started, _Pid}} ->
          ok;
        Other ->
          {error, Other}
      end
  end.

error_hook(Code, _Headers, _Body, Req) ->
  {Method, _} = cowboy_req:method(Req),
  {Version, _} = cowboy_req:version(Req),
  {Path, _} = cowboy_req:path(Req),
  {{Ip, _Port}, _} = cowboy_req:peer(Req),
  Level = log_level(Code),
  lager:log(Level, self(), "~s ~s ~b ~p ~s", [Method, Path, Code, Version, inet:ntoa(Ip)]),
  Req.

log_level(Code) when Code < 400 -> info;
log_level(_Code) -> error.

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