// Copyright (c) 2013 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_SOCKET_INFO_READER_H_
#define SHILL_SOCKET_INFO_READER_H_

#include <string>
#include <vector>

#include <base/basictypes.h>
#include <base/file_path.h>
#include <gtest/gtest_prod.h>

#include "shill/socket_info.h"

namespace shill {

class SocketInfoReader {
 public:
  SocketInfoReader();
  virtual ~SocketInfoReader();

  // Returns the file path (/proc/net/tcp by default) from where TCP/IPv4
  // socket information are read. Overloadded by unit tests to return a
  // different file path.
  virtual base::FilePath GetTcpv4SocketInfoFilePath() const;

  // Returns the file path (/proc/net/tcp6 by default) from where TCP/IPv6
  // socket information are read. Overloadded by unit tests to return a
  // different file path.
  virtual base::FilePath GetTcpv6SocketInfoFilePath() const;

  // Loads TCP socket information from /proc/net/tcp and /proc/net/tcp6.
  // Existing entries in |info_list| are always discarded. Returns false
  // if when neither /proc/net/tcp nor /proc/net/tcp6 can be read.
  virtual bool LoadTcpSocketInfo(std::vector<SocketInfo> *info_list);

 private:
  FRIEND_TEST(SocketInfoReaderTest, AppendSocketInfo);
  FRIEND_TEST(SocketInfoReaderTest, ParseConnectionState);
  FRIEND_TEST(SocketInfoReaderTest, ParseIPAddress);
  FRIEND_TEST(SocketInfoReaderTest, ParseIPAddressAndPort);
  FRIEND_TEST(SocketInfoReaderTest, ParsePort);
  FRIEND_TEST(SocketInfoReaderTest, ParseSocketInfo);
  FRIEND_TEST(SocketInfoReaderTest, ParseTimerState);
  FRIEND_TEST(SocketInfoReaderTest, ParseTransimitAndReceiveQueueValues);

  bool AppendSocketInfo(const base::FilePath &info_file_path,
                        std::vector<SocketInfo> *info_list);
  bool ParseSocketInfo(const std::string &input, SocketInfo *socket_info);
  bool ParseIPAddressAndPort(
      const std::string &input, IPAddress *ip_address, uint16 *port);
  bool ParseIPAddress(const std::string &input, IPAddress *ip_address);
  bool ParsePort(const std::string &input, uint16 *port);
  bool ParseTransimitAndReceiveQueueValues(
      const std::string &input,
      uint64 *transmit_queue_value, uint64 *receive_queue_value);
  bool ParseConnectionState(const std::string &input,
                            SocketInfo::ConnectionState *connection_state);
  bool ParseTimerState(const std::string &input,
                       SocketInfo::TimerState *timer_state);

  DISALLOW_COPY_AND_ASSIGN(SocketInfoReader);
};

}  // namespace shill

#endif  // SHILL_SOCKET_INFO_READER_H_