emqx_request_responser_SUITE.erl

%% Copyright (c) 2013-2021 EMQ Technologies Co., Ltd. All Rights Reserved.
%%
%% 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(emqx_request_responser_SUITE).

-compile(export_all).
-compile(nowarn_export_all).

-include_lib("emqx/include/emqx_mqtt.hrl").
-include_lib("eunit/include/eunit.hrl").
-include_lib("common_test/include/ct.hrl").

init_per_suite(Config) ->
    emqx_ct_helpers:boot_modules(all),
    emqx_ct_helpers:start_apps([]),
    Config.

end_per_suite(_Config) ->
    emqx_ct_helpers:stop_apps([]).

all() ->
    [request_response].

request_response(_Config) ->
    request_response_per_qos(?QOS_0),
    request_response_per_qos(?QOS_1),
    request_response_per_qos(?QOS_2).

request_response_per_qos(QoS) ->
    ReqTopic = <<"request_topic">>,
    RspTopic = <<"response_topic">>,
    {ok, Requester} = emqx_request_sender:start_link(RspTopic, QoS,
                                                     [{proto_ver, v5},
                                                      {clientid, <<"requester">>},
                                                      {properties, #{ 'Request-Response-Information' => 1}}]),
    %% This is a square service
    Square = fun(_CorrData, ReqBin) ->
                     I = b2i(ReqBin),
                     i2b(I * I)
              end,
    {ok, Responser} = emqx_request_handler:start_link(ReqTopic, QoS, Square,
                                                      [{proto_ver, v5},
                                                       {clientid, <<"responser">>}
                                                      ]),
    ok = emqx_request_sender:send(Requester, ReqTopic, RspTopic, <<"corr-1">>, <<"2">>, QoS),
    receive
        {response, <<"corr-1">>, <<"4">>} ->
            ok;
        Other ->
            erlang:error({unexpected, Other})
    after
        100 ->
            erlang:error(timeout)
    end,
    ok = emqx_request_sender:stop(Requester),
    ok = emqx_request_handler:stop(Responser).

b2i(B) -> binary_to_integer(B).
i2b(I) -> integer_to_binary(I).