client.cpp

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/*
Copyright (c) 2025 Giuseppe Roberti.
All rights reserved.
 
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
 
3. Neither the name of the copyright holder nor the names of its contributors
may be used to endorse or promote products derived from this software without
specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "event.h"
 
namespace pars_example::apps
{
 
using namespace event;
using namespace resource;

class client : public app::single<comp::client>
{
private:
 
  using parent_type = self_type;
  using self = client;

 
  milli req_recv_timeout{-1};
  milli req_send_timeout{1000};

 
  component_type::connect_p connect_p;
  std::size_t work_id = 0;
  bool fast_fib = false;
  uint64_t n = 0;

 
  app::state_machine<client_state> state = {client_state::creating};

 
  using parent_type::parent_type;

 
  void usage()
  {
    throw std::invalid_argument(
      "Usage: ./client service_cmode service_addr work_id fast_or_slow N");
  }
 
  void startup(int argc, char** argv) override
  {
    enable_source_loc_logging();

    auto ts = state.tx(client_state::creating, client_state::initializing);

    switch (argc)
    {
    case 6:
      connect_p.service_cmode = net::cmode_from_string(argv[1]);
 
      connect_p.service_addr = argv[2];
 
      work_id = std::stoull(argv[3]);
 
      if (std::string_view(argv[4]).compare("fast") == 0)
        fast_fib = true;
      else if (std::string_view(argv[4]).compare("slow") == 0)
        fast_fib = false;
      else
        usage();
 
      n = std::stoull(argv[5]);
 
      break;
 
    default:
      usage();
    }

    hfs().on<fired, init>(&self::initialize, this);
 
    hfs().on<fired, exception>(&self::terminate, this);
 
    comp().req().on<fired, pipe_created>(&self::send_work, this);
 
    comp().req().on<sent, fib_requested>(&self::recv_answer, this);
 
    comp().req().on<received, fib_computed>(&self::terminate, this);
 
    comp().req().on<fired, network_error>(&self::terminate, this);
 
    comp().req().on<fired, pipe_removed>(&self::terminate, this);

    ts.commit();
 
    pars::info(SL, "Application Started!");
  }

 
  void initialize(hf_arg<fired, init> fired)
  {
    auto ts = state.tx(client_state::initializing, client_state::started);
 
    comp().init({.req_opts = {.recv_timeout = req_recv_timeout.count(),
                              .send_timeout = req_send_timeout.count()}});
 
    comp().connect(connect_p);
 
    ts.commit();
 
    pars::info(SL, "Fired {}, Application Initialized!", fired.event());
  }
 
  void send_work(hf_arg<fired, pipe_created> fired)
  {
    auto ts = state.tx(client_state::started, client_state::sending_work);
 
    auto [ev, md] = fired.as_tuple();
 
    auto out_ev = fib_requested{work_id, n, fast_fib};
 
    // use the default context on the sock to send the event
    comp().req().sock().send(out_ev, md.pipe());
 
    ts.commit();
 
    pars::info(SL, "Fired {}, Sent {}!", ev, out_ev);
  }
 
  void recv_answer(hf_arg<sent, fib_requested> sent)
  {
    auto ts =
      state.tx(client_state::sending_work, client_state::waiting_work_done);
 
    // recv on the default context of the sock
    comp().req().sock().recv();
 
    ts.commit();
 
    pars::info(SL, "Sent {}, Receiving!", sent.event());
  }
 
  void terminate(hf_arg<received, fib_computed> recv)
  {
    auto ts =
      state.tx(client_state::waiting_work_done, client_state::terminating);
 
    auto& ev = recv.event();
 
    graceful_terminate();
 
    ts.commit();
 
    pars::info(SL, "Received {}, Application Terminated!", ev);
 
    std::cout << "WORK(" << ev.work_id << ") FIB(" << n << ") = " << ev.fib_n
              << "\n";
  }
 
  void terminate(hf_arg<fired, exception> fired)
  {
    auto ts = state.tx(client_state::terminated);
 
    auto& ev = fired.event();
 
    graceful_terminate();
 
    ts.commit();
 
    pars::info(SL, "Fired {} while \"{}\", Application Terminated!", ev,
               state.current());
 
    std::cout << std::format("ERROR: {}", ev) << std::endl;
  }
 
  void terminate(hf_arg<fired, network_error> fired)
  {
    auto ts = state.tx(client_state::terminated);
 
    auto& ev = fired.event();
 
    graceful_terminate();
 
    ts.commit();
 
    pars::info(SL, "Fired {} while \"{}\", Application Terminated!", ev,
               state.current());
 
    std::cout << std::format("ERROR: {}", ev.error) << std::endl;
  }
 
  void terminate(hf_arg<fired, pipe_removed> fired)
  {
    auto ts = state.tx(client_state::terminated);
 
    graceful_terminate();
 
    ts.commit();
 
    pars::info(SL, "Fired {} while \"{}\", Application Terminated!",
               fired.event(), state.current());
 
    std::cout << std::format("Client Disconnected!") << std::endl;
  }
};
 
} // namespace pars_example::apps
 
int main(int argc, char** argv)
{
  auto app = ::pars_example::apps::client{};
 
  try
  {
    return app.exec(argc, argv);
  }
  catch (std::exception& e)
  {
    std::cout << std::format("Error: {}", e.what()) << "\n";
 
    return EXIT_FAILURE;
  }
}