shill_ares.h

// Copyright (c) 2011 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_ARES_H_
#define SHILL_ARES_H_

#include <ares.h>

#include <base/lazy_instance.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);

 protected:
  Ares();

 private:
  friend struct base::DefaultLazyInstanceTraits<Ares>;

  DISALLOW_COPY_AND_ASSIGN(Ares);
};

}  // namespace shill

#endif  // SHILL_ARES_H_