// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SHILL_SHILL_ARES_H_
#define SHILL_SHILL_ARES_H_

#include <ares.h>

#include <base/macros.h>
#include <base/no_destructor.h>

namespace shill {

// A "ares.h" abstraction allowing mocking in tests.
class Ares {
 public:
  virtual ~Ares();

  static Ares* GetInstance();

  // ares_destroy
  virtual void Destroy(ares_channel channel);

  // ares_gethostbyname
  virtual void GetHostByName(ares_channel channel,
                             const char* hostname,
                             int family,
                             ares_host_callback callback,
                             void* arg);

  // ares_getsock
  virtual int GetSock(ares_channel channel, ares_socket_t* socks, int numsocks);

  // ares_init_options
  virtual int InitOptions(ares_channel* channelptr,
                          struct ares_options* options,
                          int optmask);

  // ares_process_fd
  virtual void ProcessFd(ares_channel channel,
                         ares_socket_t read_fd,
                         ares_socket_t write_fd);

  // ares_set_local_dev
  virtual void SetLocalDev(ares_channel channel, const char* local_dev_name);

  // ares_timeout
  virtual struct timeval* Timeout(ares_channel channel,
                                  struct timeval* maxtv,
                                  struct timeval* tv);

  // ares_set_servers_csv
  virtual int SetServersCsv(ares_channel channel, const char* servers);

 protected:
  Ares();
  Ares(const Ares&) = delete;
  Ares& operator=(const Ares&) = delete;

 private:
  friend class base::NoDestructor<Ares>;
};

}  // namespace shill

#endif  // SHILL_SHILL_ARES_H_