destination_acceptor.h

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/*
  Copyright (c) 2017, 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
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  the program or referenced in the documentation.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#ifndef MYSQL_HARNESS_DESTINATION_ACCEPTOR_INCLUDED
#define MYSQL_HARNESS_DESTINATION_ACCEPTOR_INCLUDED
 
#include "harness_export.h"
 
#include <variant>
 
#include "mysql/harness/destination_endpoint.h"
#include "mysql/harness/net_ts/internet.h"
#include "mysql/harness/net_ts/io_context.h"
#include "mysql/harness/net_ts/local.h"
 
namespace mysql_harness {
 
class HARNESS_EXPORT DestinationAcceptor {
 public:
  using TcpType = net::ip::tcp::acceptor;
  using LocalType = local::stream_protocol::acceptor;
 
  explicit DestinationAcceptor(net::io_context &io_ctx)
      : acceptor_(TcpType(io_ctx)) {}
  explicit DestinationAcceptor(TcpType sock) : acceptor_(std::move(sock)) {}
  explicit DestinationAcceptor(LocalType sock) : acceptor_(std::move(sock)) {}
 
  bool is_tcp() const { return std::holds_alternative<TcpType>(acceptor_); }
  bool is_local() const { return !is_tcp(); }
 
  TcpType &as_tcp() { return std::get<TcpType>(acceptor_); }
  const TcpType &as_tcp() const { return std::get<TcpType>(acceptor_); }
 
  LocalType &as_local() { return std::get<LocalType>(acceptor_); }
  const LocalType &as_local() const { return std::get<LocalType>(acceptor_); }
 
  stdx::expected<void, std::error_code> open(
      const mysql_harness::DestinationEndpoint &ep);
 
  stdx::expected<void, std::error_code> bind(
      const mysql_harness::DestinationEndpoint &ep) {
    if (ep.is_local()) {
      return as_local().bind(ep.as_local());
    }
 
    return as_tcp().bind(ep.as_tcp());
  }
 
  stdx::expected<void, std::error_code> listen(int backlog) {
    if (is_local()) {
      return as_local().listen(backlog);
    }
 
    return as_tcp().listen(backlog);
  }
 
  stdx::expected<void, std::error_code> native_non_blocking(bool val) {
    if (is_local()) {
      return as_local().native_non_blocking(val);
    }
 
    return as_tcp().native_non_blocking(val);
  }
 
  net::impl::socket::native_handle_type native_handle() const {
    if (is_local()) {
      return as_local().native_handle();
    }
 
    return as_tcp().native_handle();
  }
 
  template <typename SettableSocketOption>
  stdx::expected<void, std::error_code> set_option(
      const SettableSocketOption &option) {
    if (is_local()) {
      return as_local().set_option(option);
    }
 
    return as_tcp().set_option(option);
  }
 
  net::io_context::executor_type get_executor() {
    if (is_local()) {
      return as_local().get_executor();
    }
 
    return as_tcp().get_executor();
  }
 
  net::io_context &io_context() { return get_executor().context(); }
 
  stdx::expected<void, std::error_code> cancel() {
    if (is_local()) {
      return as_local().cancel();
    }
 
    return as_tcp().cancel();
  }
 
  stdx::expected<void, std::error_code> close() {
    if (is_local()) {
      return as_local().close();
    }
 
    return as_tcp().close();
  }
 
  template <class CompletionToken>
  auto async_wait(net::socket_base::wait_type wt, CompletionToken &&token) {
    if (is_local()) {
      return as_local().async_wait(wt, std::forward<CompletionToken>(token));
    }
 
    return as_tcp().async_wait(wt, std::forward<CompletionToken>(token));
  }
 
  template <class CompletionToken>
  auto async_accept(CompletionToken &&token) {
    if (is_local()) {
      return as_local().async_accept(std::forward<CompletionToken>(token));
    }
 
    return as_tcp().async_accept(std::forward<CompletionToken>(token));
  }
 
  template <class CompletionToken>
  auto async_accept(mysql_harness::DestinationEndpoint &ep,
                    CompletionToken &&token) {
    if (is_local()) {
      if (!ep.is_local()) {
        ep = mysql_harness::DestinationEndpoint(
            mysql_harness::DestinationEndpoint::LocalType());
      }
      return as_local().async_accept(ep.as_local(),
                                     std::forward<CompletionToken>(token));
    }
 
    if (!ep.is_tcp()) {
      ep = mysql_harness::DestinationEndpoint(
          mysql_harness::DestinationEndpoint::TcpType());
    }
 
    return as_tcp().async_accept(ep.as_tcp(),
                                 std::forward<CompletionToken>(token));
  }
 
  template <class CompletionToken>
  void async_accept(net::io_context &io_ctx, CompletionToken &&token) {
    if (is_local()) {
      return as_local().async_accept(io_ctx,
                                     std::forward<CompletionToken>(token));
    }
 
    return as_tcp().async_accept(io_ctx, std::forward<CompletionToken>(token));
  }
 
 private:
  std::variant<TcpType, LocalType> acceptor_;
};
 
}  // namespace mysql_harness
 
#endif