op.h

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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.
*/
#pragma once
 
#include "nngxx/aio.h"
#include "nngxx/err.h"
#include "nngxx/msg.h"
#include "nngxx/pipe.h"
 
#include "pars/ev/enqueuer.h"
#include "pars/ev/event.h"
#include "pars/ev/serializer.h"
#include "pars/fmt/helpers.h"
#include "pars/net/dir.h"
 
#include <spdlog/spdlog.h>
 
#include <expected>
#include <functional>
 
namespace pars::net
{
 
using cb_f = std::function<void(clev::expected<void>, nngxx::msg)>;
 
class op
{
public:
  ~op()
  {
    if (aio_m)
      aio_m.wait();
  }
 
  explicit operator bool() { return static_cast<bool>(aio_m); }
 
  template<ev::event_c event_t, tool_c tool_t>
  void send(ev::enqueuer& r, tool_t& t, pipe p, event_t ev)
  {
    auto m = ev::serialize::to_network(ev);
 
    if (p)
      m.set_pipe(p);
 
    pars::debug(SL, lf::net, "{}: Send Message [{}]!", f::pntl{p, t}, m);
 
    // replace the callback with the new one
    cb_m = [&, p](clev::expected<void> res, nngxx::msg m) mutable {
      if (res)
      {
        // NOTE: m is empty on success
 
        pars::debug(SL, lf::net, "{}: Sent Event [{}]!", f::pntl{p, t}, ev);
 
        r.queue_sent(std::move(ev), t.socket_id(), t, p);
      }
      else
      {
        // NOTE: m is not empty on failure
 
        auto pv = m.get_pipe();
 
        pars::err(SL, lf::net, "{}: Error Sending {}! [msg:{},err:{}]",
                  f::pntl{pv, t}, nametype(ev), m, res.error());
 
        r.queue_fire(ev::network_error{res.error(), dir::out}, t.socket_id(), t,
                     pv);
      }
    };
 
    // make aio - NOTE: pass this, cant move op
    aio_m = nngxx::make_aio(op::send_cb, this).value_or_abort();
 
    // start send
    aio_m.set_msg(std::move(m));
    t.send_aio(aio_m);
  }
 
  template<tool_c tool_t>
  void recv(ev::enqueuer& r, tool_t& t)
  {
    pars::debug(SL, lf::net, "{}: Receive Message!", f::pntl{{}, t});
 
    // replace the operation with the new one
    cb_m = [&](clev::expected<void> res, nngxx::msg m) {
      if (res)
      {
        // NOTE: m is not empty on success
 
        auto pv = m.get_pipe();
 
        pars::debug(SL, lf::net, "{}: Received Message! [{}]", f::pntl{pv, t},
                    m);
 
        r.queue_received(std::move(m), t.socket_id(), t, pv);
      }
      else
      {
        // NOTE: m is empty on failure
 
        auto pv = nngxx::pipe_view();
 
        pars::err(SL, lf::net, "{}: Error Receiving! [{}]", f::pntl{pv, t},
                  res.error());
 
        r.queue_fire(ev::network_error{res.error(), dir::in}, t.socket_id(), t,
                     pv);
      }
    };
 
    // make aio - NOTE: pass this, cant move op
    aio_m = nngxx::make_aio(op::recv_cb, this).value_or_abort();
 
    // start recv
    t.recv_aio(aio_m);
  }
 
  void sleep(nng_duration ms, std::function<void()> f)
  {
    cb_m = [&, f](clev::expected<void> res, nngxx::msg m) {
      if (res)
      {
        // the sleep completed successfully, execute f
        f();
      }
    };
 
    // make aio - NOTE: pass this, cant move op
    aio_m = nngxx::make_aio(op::sleep_cb, this).value_or_abort();
 
    nngxx::sleep(ms, aio_m);
  }
 
  void reset_sleep(nng_duration ms)
  {
    stop();
 
    // make aio - NOTE: pass this, cant move op
    aio_m = nngxx::make_aio(op::sleep_cb, this).value_or_abort();
 
    nngxx::sleep(ms, aio_m);
  }

  std::error_code result() const
  {
    return aio_m.result().error_or(nngxx::err::success);
  }

  void abort(nngxx::err err) { aio_m.abort(err); }

  void cancel() { aio_m.cancel(); }

  void wait() const { aio_m.wait(); }

  void stop() { aio_m.stop(); }
 
private:
  static void send_cb(void* arg)
  {
    auto self = static_cast<op*>(arg);
 
    // get the result
    auto res = self->aio_m.result();
 
    nngxx::msg msg;
 
    if (!res)
    {
      // take ownership of the message
      msg = self->aio_m.release_msg();
    }
 
    // execute the callback passing ownership of the message
    self->cb_m(res, std::move(msg));
  }
 
  static void recv_cb(void* arg)
  {
    auto self = static_cast<op*>(arg);
 
    // get the result
    auto res = self->aio_m.result();
 
    nngxx::msg msg;
 
    if (res)
    {
      // take ownership of the message
      msg = self->aio_m.release_msg();
    }
 
    // execute the callback passing ownership of the message
    self->cb_m(res, std::move(msg));
  }
 
  static void sleep_cb(void* arg)
  {
    auto self = static_cast<op*>(arg);
 
    auto res = self->aio_m.result();
 
    if (res)
      self->cb_m(res, nngxx::msg{});
  }
 
  nngxx::aio aio_m;
  cb_f cb_m;
};
 
} // namespace pars::net