group_replication/src/member_info.cc

/* Copyright (c) 2014, 2021, 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.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   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
   separately licensed software that they have included with MySQL.

   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, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

#include "member_info.h"
#include "plugin_psi.h"

using std::string;
using std::vector;
using std::map;

Group_member_info::
Group_member_info(char* hostname_arg,
                  uint port_arg,
                  char* uuid_arg,
                  int write_set_extraction_algorithm_arg,
                  const std::string& gcs_member_id_arg,
                  Group_member_info::Group_member_status status_arg,
                  Member_version& member_version_arg,
                  ulonglong gtid_assignment_block_size_arg,
                  Group_member_info::Group_member_role role_arg,
                  bool in_single_primary_mode,
                  bool has_enforces_update_everywhere_checks,
                  uint member_weight_arg,
                  uint lower_case_table_names_arg)
  : Plugin_gcs_message(CT_MEMBER_INFO_MESSAGE),
    hostname(hostname_arg), port(port_arg), uuid(uuid_arg),
    status(status_arg),
    write_set_extraction_algorithm(write_set_extraction_algorithm_arg),
    gtid_assignment_block_size(gtid_assignment_block_size_arg),
    unreachable(false),
    role(role_arg),
    configuration_flags(0), conflict_detection_enable(!in_single_primary_mode),
    member_weight(member_weight_arg),
    lower_case_table_names(lower_case_table_names_arg)
{
  gcs_member_id= new Gcs_member_identifier(gcs_member_id_arg);
  member_version= new Member_version(member_version_arg.get_version());

  /* Handle single_primary_mode */
  if (in_single_primary_mode)
    configuration_flags |= CNF_SINGLE_PRIMARY_MODE_F;

  /* Handle enforce_update_everywhere_checks */
  if (has_enforces_update_everywhere_checks)
    configuration_flags |= CNF_ENFORCE_UPDATE_EVERYWHERE_CHECKS_F;
}

Group_member_info::Group_member_info(Group_member_info& other)
  : Plugin_gcs_message(CT_MEMBER_INFO_MESSAGE),
    hostname(other.get_hostname()),
    port(other.get_port()),
    uuid(other.get_uuid()),
    status(other.get_recovery_status()),
    executed_gtid_set(other.get_gtid_executed()),
    retrieved_gtid_set(other.get_gtid_retrieved()),
    write_set_extraction_algorithm(other.get_write_set_extraction_algorithm()),
    gtid_assignment_block_size(other.get_gtid_assignment_block_size()),
    unreachable(other.is_unreachable()),
    role(other.get_role()),
    configuration_flags(other.get_configuration_flags()),
    conflict_detection_enable(other.is_conflict_detection_enabled()),
    member_weight(other.get_member_weight()),
    lower_case_table_names(other.get_lower_case_table_names())
{
  gcs_member_id= new Gcs_member_identifier(other.get_gcs_member_id()
                                               .get_member_id());
  member_version= new Member_version(other.get_member_version()
                                         .get_version());
}

Group_member_info::Group_member_info(const uchar* data, uint64 len)
  : Plugin_gcs_message(CT_MEMBER_INFO_MESSAGE),
    gcs_member_id(NULL), member_version(NULL),
    unreachable(false),
    lower_case_table_names(DEFAULT_NOT_RECEIVED_LOWER_CASE_TABLE_NAMES)
{
  decode(data, len);
}

Group_member_info::~Group_member_info()
{
  delete gcs_member_id;
  delete member_version;
}

void
Group_member_info::encode_payload(std::vector<unsigned char>* buffer) const
{
  DBUG_ENTER("Group_member_info::encode_payload");

  encode_payload_item_string(buffer, PIT_HOSTNAME,
                             hostname.c_str(),
                             hostname.length());

  uint16 port_aux= (uint16)port;
  encode_payload_item_int2(buffer, PIT_PORT,
                           port_aux);

  encode_payload_item_string(buffer, PIT_UUID,
                             uuid.c_str(),
                             uuid.length());

  encode_payload_item_string(buffer, PIT_GCS_ID,
                             gcs_member_id->get_member_id().c_str(),
                             gcs_member_id->get_member_id().length());

  char status_aux= (uchar)status;
  encode_payload_item_char(buffer, PIT_STATUS,
                           status_aux);

  uint32 version_aux= (uint32)member_version->get_version();
  encode_payload_item_int4(buffer, PIT_VERSION,
                           version_aux);

  uint16 write_set_extraction_algorithm_aux=
      (uint16)write_set_extraction_algorithm;
  encode_payload_item_int2(buffer, PIT_WRITE_SET_EXTRACTION_ALGORITHM,
                           write_set_extraction_algorithm_aux);

  encode_payload_item_string(buffer, PIT_EXECUTED_GTID,
                             executed_gtid_set.c_str(),
                             executed_gtid_set.length());

  encode_payload_item_string(buffer, PIT_RETRIEVED_GTID,
                             retrieved_gtid_set.c_str(),
                             retrieved_gtid_set.length());

  encode_payload_item_int8(buffer, PIT_GTID_ASSIGNMENT_BLOCK_SIZE,
                           gtid_assignment_block_size);

  char role_aux= (uchar)role;
  encode_payload_item_char(buffer, PIT_MEMBER_ROLE, role_aux);

  uint32 configuration_flags_aux= (uint32)configuration_flags;
  encode_payload_item_int4(buffer, PIT_CONFIGURATION_FLAGS,
                           configuration_flags_aux);

  /*
    MySQL 5.7.18+ payloads
  */
  char conflict_detection_enable_aux= conflict_detection_enable ? '1' : '0';
  encode_payload_item_char(buffer, PIT_CONFLICT_DETECTION_ENABLE,
                           conflict_detection_enable_aux);

  uint16 member_weight_aux= (uint16)member_weight;
  encode_payload_item_int2(buffer, PIT_MEMBER_WEIGHT,
                           member_weight_aux);

  uint16 lower_case_table_names_aux= static_cast <uint16> (lower_case_table_names);
#ifndef NDEBUG
  if (lower_case_table_names != SKIP_ENCODING_LOWER_CASE_TABLE_NAMES)
#endif
  encode_payload_item_int2(buffer, PIT_LOWER_CASE_TABLE_NAME,
                           lower_case_table_names_aux);

  DBUG_VOID_RETURN;
}

void
Group_member_info::decode_payload(const unsigned char* buffer,
                                  const unsigned char* end)
{
  DBUG_ENTER("Group_member_info::decode_payload");
  const unsigned char *slider= buffer;
  uint16 payload_item_type= 0;
  unsigned long long payload_item_length= 0;

  decode_payload_item_string(&slider,
                             &payload_item_type,
                             &hostname,
                             &payload_item_length);

  uint16 port_aux= 0;
  decode_payload_item_int2(&slider,
                           &payload_item_type,
                           &port_aux);
  port= (uint)port_aux;

  decode_payload_item_string(&slider,
                             &payload_item_type,
                             &uuid,
                             &payload_item_length);

  std::string gcs_member_id_aux;
  decode_payload_item_string(&slider,
                             &payload_item_type,
                             &gcs_member_id_aux,
                             &payload_item_length);
  delete gcs_member_id;
  gcs_member_id= new Gcs_member_identifier(gcs_member_id_aux);

  unsigned char status_aux= 0;
  decode_payload_item_char(&slider,
                           &payload_item_type,
                           &status_aux);
  status= (Group_member_status)status_aux;

  uint32 member_version_aux= 0;
  decode_payload_item_int4(&slider,
                           &payload_item_type,
                           &member_version_aux);
  delete member_version;
  member_version= new Member_version(member_version_aux);

  uint16 write_set_extraction_algorithm_aux= 0;
  decode_payload_item_int2(&slider,
                           &payload_item_type,
                           &write_set_extraction_algorithm_aux);
  write_set_extraction_algorithm= (uint)write_set_extraction_algorithm_aux;

  decode_payload_item_string(&slider,
                             &payload_item_type,
                             &executed_gtid_set,
                             &payload_item_length);

  decode_payload_item_string(&slider,
                             &payload_item_type,
                             &retrieved_gtid_set,
                             &payload_item_length);

  decode_payload_item_int8(&slider,
                           &payload_item_type,
                           &gtid_assignment_block_size);

  unsigned char role_aux= 0;
  decode_payload_item_char(&slider,
                           &payload_item_type,
                           &role_aux);
  role= (Group_member_role)role_aux;

  uint32 configuration_flags_aux= 0;
  decode_payload_item_int4(&slider,
                           &payload_item_type,
                           &configuration_flags_aux);
  configuration_flags= configuration_flags_aux;

  /*
    MySQL 5.7.18+ payloads
    We need to check if there are more payload items to read, if the member
    info message was send by a lower version member, there will not.
  */
  while (slider + Plugin_gcs_message::WIRE_PAYLOAD_ITEM_HEADER_SIZE <= end)
  {
    // Read payload item header to find payload item length.
    decode_payload_item_type_and_length(&slider,
                                        &payload_item_type,
                                        &payload_item_length);

    switch (payload_item_type)
    {
      case PIT_CONFLICT_DETECTION_ENABLE:
        if (slider + payload_item_length <= end)
        {
          unsigned char conflict_detection_enable_aux= *slider;
          slider += payload_item_length;
          conflict_detection_enable=
              (conflict_detection_enable_aux == '1') ? true : false;
        }
        break;

      case PIT_MEMBER_WEIGHT:
        if (slider + payload_item_length <= end)
        {
          uint16 member_weight_aux= uint2korr(slider);
          slider += payload_item_length;
          member_weight= (uint)member_weight_aux;
        }
        break;

      case PIT_LOWER_CASE_TABLE_NAME:
        if (slider + payload_item_length <= end)
        {
          uint16 lower_case_table_names_aux= uint2korr(slider);
          slider += payload_item_length;
          lower_case_table_names= static_cast <uint>(lower_case_table_names_aux);
        }
        break;
    }
  }

  DBUG_VOID_RETURN;
}

const string&
Group_member_info::get_hostname()
{
  return hostname;
}

uint
Group_member_info::get_port()
{
  return port;
}

const string&
Group_member_info::get_uuid()
{
  return uuid;
}

Group_member_info::Group_member_status
Group_member_info::get_recovery_status()
{
  return status;
}

Group_member_info::Group_member_role
Group_member_info::get_role()
{
  return role;
}

const Gcs_member_identifier&
Group_member_info::get_gcs_member_id()
{
  return *gcs_member_id;
}

void
Group_member_info::update_recovery_status(Group_member_status new_status)
{
  status= new_status;
}

void
Group_member_info::update_gtid_sets(std::string& executed_gtids,
                                    std::string& retrieved_gtids)
{
  executed_gtid_set.assign(executed_gtids);
  retrieved_gtid_set.assign(retrieved_gtids);
}

void
Group_member_info::set_role(Group_member_role new_role)
{
  role= new_role;
}

const Member_version&
Group_member_info::get_member_version()
{
  return *member_version;
}

const std::string&
Group_member_info::get_gtid_executed()
{
  return executed_gtid_set;
}

const std::string&
Group_member_info::get_gtid_retrieved()
{
  return retrieved_gtid_set;
}

uint
Group_member_info::get_write_set_extraction_algorithm()
{
  return write_set_extraction_algorithm;
}

ulonglong
Group_member_info::get_gtid_assignment_block_size()
{
  return gtid_assignment_block_size;
}

uint32
Group_member_info::get_configuration_flags()
{
  return configuration_flags;
}

uint
Group_member_info::get_lower_case_table_names() const
{
  return lower_case_table_names;
}

bool Group_member_info::in_primary_mode()
{
  return get_configuration_flags() & CNF_SINGLE_PRIMARY_MODE_F;
}

bool Group_member_info::has_enforces_update_everywhere_checks()
{
  return get_configuration_flags() & CNF_ENFORCE_UPDATE_EVERYWHERE_CHECKS_F;
}

bool
Group_member_info::is_unreachable()
{
  return unreachable;
}

void
Group_member_info::set_unreachable()
{
  unreachable= true;
}

void
Group_member_info::set_reachable()
{
  unreachable= false;
}

void Group_member_info::enable_conflict_detection()
{
  conflict_detection_enable= true;
}

void Group_member_info::disable_conflict_detection()
{
  conflict_detection_enable= false;
}

bool Group_member_info::is_conflict_detection_enabled()
{
  return conflict_detection_enable;
}

void Group_member_info::set_member_weight(uint new_member_weight)
{
  member_weight= new_member_weight;
}

uint Group_member_info::get_member_weight()
{
  return member_weight;
}

bool
Group_member_info::operator ==(Group_member_info& other)
{
  return this->get_uuid().compare(other.get_uuid()) == 0;
}

const char*
Group_member_info::get_member_status_string(Group_member_status status)
{
  switch(status)
  {
    case MEMBER_ONLINE:
      return "ONLINE";
    case MEMBER_OFFLINE:
      return "OFFLINE";
    case MEMBER_IN_RECOVERY:
      return "RECOVERING";
    case MEMBER_ERROR:
      return "ERROR";
    case MEMBER_UNREACHABLE:
      return "UNREACHABLE";
    default:
      return "OFFLINE"; /* purecov: inspected */
  }
}

const char*
Group_member_info::get_configuration_flag_string(const uint32 configuation_flag)
{
  switch (configuation_flag)
  {
  case 0:
    return "";
  case CNF_ENFORCE_UPDATE_EVERYWHERE_CHECKS_F:
    return "group_replication_enforce_update_everywhere_checks";
  case CNF_SINGLE_PRIMARY_MODE_F:
    return "group_replication_single_primary_mode";
  default:
    return "UNKNOWN"; /* purecov: inspected */
  }
}

std::string
Group_member_info::get_configuration_flags_string(const uint32 configuation_flags)
{
  std::string result;
  uint32 configuration_flags_mask = 1;

  while (configuration_flags_mask > 0)
  {
    const uint32 current_flag = configuration_flags_mask & configuation_flags;
    const char* current_flag_name = get_configuration_flag_string(current_flag);

    if (current_flag)
    {
      if (!result.empty())
        result += ","; /* purecov: inspected */

      result += current_flag_name;
    }

    configuration_flags_mask = configuration_flags_mask << 1;
  }

  return result;
}

bool
Group_member_info::comparator_group_member_version(Group_member_info *m1,
                                                   Group_member_info *m2)
{
  return m2->has_greater_version(m1);
}

bool
Group_member_info::comparator_group_member_uuid(Group_member_info *m1,
                                                Group_member_info *m2)
{
  return m1->has_lower_uuid(m2);
}

bool
Group_member_info::comparator_group_member_weight(Group_member_info *m1,
                                                  Group_member_info *m2)
{
  return m1->has_greater_weight(m2);
}

bool
Group_member_info::has_greater_version(Group_member_info *other)
{
  if (*member_version > *(other->member_version))
    return true;

  return false;
}

bool
Group_member_info::has_lower_uuid(Group_member_info *other)
{
  return this->get_uuid().compare(other->get_uuid()) < 0;
}

bool
Group_member_info::has_greater_weight(Group_member_info *other)
{
  if (this->get_member_weight() > other->get_member_weight())
    return true;

  if (this->get_member_weight() == other->get_member_weight())
    return has_lower_uuid(other);

  return false;
}

Group_member_info_manager::
Group_member_info_manager(Group_member_info* local_member_info)
{
  members= new map<string, Group_member_info*>();
  this->local_member_info= local_member_info;

  mysql_mutex_init(key_GR_LOCK_group_info_manager, &update_lock,
                   MY_MUTEX_INIT_FAST);

  add(local_member_info);
}

Group_member_info_manager::~Group_member_info_manager()
{
  clear_members();
  delete members;
}

size_t
Group_member_info_manager::get_number_of_members()
{
  return members->size();
}

Group_member_info*
Group_member_info_manager::get_group_member_info(const string& uuid)
{
  Group_member_info* member= NULL;
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;

  it= members->find(uuid);

  if(it != members->end())
  {
    member= (*it).second;
  }

  Group_member_info* member_copy= NULL;
  if(member != NULL)
  {
    member_copy= new Group_member_info(*member);
  }

  mysql_mutex_unlock(&update_lock);

  return member_copy;
}

Group_member_info*
Group_member_info_manager::get_group_member_info_by_index(int idx)
{
  Group_member_info* member= NULL;

  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;
  if(idx < (int)members->size())
  {
    int i= 0;
    for(it= members->begin(); i <= idx; i++, it++)
    {
      member= (*it).second;
    }
  }

  Group_member_info* member_copy= NULL;
  if(member != NULL)
  {
    member_copy= new Group_member_info(*member);
  }
  mysql_mutex_unlock(&update_lock);

  return member_copy;
}

Group_member_info*
Group_member_info_manager::
get_group_member_info_by_member_id(Gcs_member_identifier idx)
{
  Group_member_info* member= NULL;

  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;
  for(it= members->begin(); it != members->end(); it++)
  {
    if((*it).second->get_gcs_member_id() == idx)
    {
      member= new Group_member_info(*(*it).second);
      break;
    }
  }

  mysql_mutex_unlock(&update_lock);
  return member;
}

vector<Group_member_info*>*
Group_member_info_manager::get_all_members()
{
  mysql_mutex_lock(&update_lock);

  vector<Group_member_info*>* all_members= new vector<Group_member_info*>();
  map<string, Group_member_info*>::iterator it;
  for(it= members->begin(); it != members->end(); it++)
  {
    Group_member_info* member_copy = new Group_member_info(*(*it).second);
    all_members->push_back(member_copy);
  }

  mysql_mutex_unlock(&update_lock);
  return all_members;
}

void
Group_member_info_manager::add(Group_member_info* new_member)
{
  mysql_mutex_lock(&update_lock);

  (*members)[new_member->get_uuid()]= new_member;

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::update(vector<Group_member_info*>* new_members)
{
  mysql_mutex_lock(&update_lock);

  this->clear_members();

  vector<Group_member_info*>::iterator new_members_it;
  for(new_members_it= new_members->begin();
      new_members_it != new_members->end();
      new_members_it++)
  {
    //If this bears the local member to be updated
    // It will add the current reference and update its status
    if(*(*new_members_it) == *local_member_info)
    {
      local_member_info
          ->update_recovery_status((*new_members_it)->get_recovery_status());

      delete (*new_members_it);

      continue;
    }

    (*members)[(*new_members_it)->get_uuid()]= (*new_members_it);
  }

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::
update_member_status(const string& uuid,
                     Group_member_info::Group_member_status new_status)
{
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;

  it= members->find(uuid);

  if(it != members->end())
  {
    (*it).second->update_recovery_status(new_status);
  }

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::
set_member_unreachable(const std::string &uuid)
{
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it = members->find(uuid);
  if (it != members->end()) {
    (*it).second->set_unreachable();
  }

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::
set_member_reachable(const std::string &uuid)
{
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it = members->find(uuid);
  if (it != members->end()) {
    (*it).second->set_reachable();
  }

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::
update_gtid_sets(const string& uuid,
                 string& gtid_executed,
                 string& gtid_retrieved)
{
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;

  it= members->find(uuid);

  if(it != members->end())
  {
    (*it).second->update_gtid_sets(gtid_executed, gtid_retrieved);
  }

  mysql_mutex_unlock(&update_lock);
}

void
Group_member_info_manager::
update_member_role(const string& uuid,
                   Group_member_info::Group_member_role new_role)
{
  mysql_mutex_lock(&update_lock);

  map<string, Group_member_info*>::iterator it;

  it= members->find(uuid);

  if(it != members->end())
  {
    (*it).second->set_role(new_role);
  }

  mysql_mutex_unlock(&update_lock);
}


void
Group_member_info_manager::clear_members()
{
  map<string, Group_member_info*>::iterator it= members->begin();
  while (it != members->end()) {
    if((*it).second == local_member_info)
    {
      ++it;
      continue;
    }

    delete (*it).second;
    members->erase(it++);
  }
}

bool Group_member_info_manager::is_conflict_detection_enabled()
{
  bool conflict_detection= false;

  mysql_mutex_lock(&update_lock);
  map<string, Group_member_info*>::iterator it= members->begin();
  while (it != members->end())
  {
    if ((*it).second != local_member_info)
    {
      conflict_detection|= (*it).second->is_conflict_detection_enabled();
    }
    ++it;
  }
  mysql_mutex_unlock(&update_lock);

  return conflict_detection;
}


void
Group_member_info_manager::encode(vector<uchar>* to_encode)
{
  Group_member_info_manager_message *group_info_message=
    new Group_member_info_manager_message(*this);
  group_info_message->encode(to_encode);
  delete group_info_message;
}

vector<Group_member_info*>*
Group_member_info_manager::decode(const uchar* to_decode, uint64 length)
{
  vector<Group_member_info*>* decoded_members= NULL;

  Group_member_info_manager_message *group_info_message=
    new Group_member_info_manager_message();
  group_info_message->decode(to_decode, length);
  decoded_members= group_info_message->get_all_members();
  delete group_info_message;

  return decoded_members;
}

void
Group_member_info_manager::
get_primary_member_uuid(std::string &primary_member_uuid)
{
  map<string, Group_member_info*>::iterator it= members->begin();

  for (it= members->begin(); it != members->end(); it++)
  {
    Group_member_info* info= (*it).second;
    if (info->get_role() == Group_member_info::MEMBER_ROLE_PRIMARY)
    {
      assert(primary_member_uuid.empty());
      primary_member_uuid =info->get_uuid();
    }
  }

  if (primary_member_uuid.empty() ||
      Group_member_info::MEMBER_ERROR ==
        local_member_info->get_recovery_status())
    primary_member_uuid= "UNDEFINED";
}

bool Group_member_info_manager::is_majority_unreachable()
{
  bool ret= false;
  int unreachables= 0;

  mysql_mutex_lock(&update_lock);
  map<string, Group_member_info*>::iterator it= members->begin();

  for (it= members->begin(); it != members->end(); it++)
  {
    Group_member_info* info= (*it).second;
    if (info->is_unreachable())
      unreachables++;
  }
  ret= (members->size() - unreachables) <= (members->size() / 2);
  mysql_mutex_unlock(&update_lock);

  return ret;
}

std::string
Group_member_info_manager::get_string_current_view_active_hosts() const
{
  std::stringstream hosts_string;
  map<string, Group_member_info*>::iterator all_members_it= members->begin();
  bool first_entry = true;

  while (all_members_it != members->end())
  {
    Group_member_info* member_info= (*all_members_it).second;
    if (!first_entry)
      hosts_string << ", ";
    else
      first_entry = false;
    hosts_string << member_info->get_hostname() << ":" << member_info->get_port();
    all_members_it++;
  }

  return hosts_string.str();
}

Group_member_info_manager_message::Group_member_info_manager_message()
  : Plugin_gcs_message(CT_MEMBER_INFO_MANAGER_MESSAGE)
{
  DBUG_ENTER("Group_member_info_manager_message::Group_member_info_manager_message");
  members= new vector<Group_member_info*>();
  DBUG_VOID_RETURN;
}

Group_member_info_manager_message::Group_member_info_manager_message(
    Group_member_info_manager& group_info)
  : Plugin_gcs_message(CT_MEMBER_INFO_MANAGER_MESSAGE),
    members(group_info.get_all_members())
{
  DBUG_ENTER("Group_member_info_manager_message::Group_member_info_manager_message");
  DBUG_VOID_RETURN;
}

Group_member_info_manager_message::Group_member_info_manager_message(
    Group_member_info* member_info)
  : Plugin_gcs_message(CT_MEMBER_INFO_MANAGER_MESSAGE),
    members(NULL)
{
  DBUG_ENTER("Group_member_info_manager_message::Group_member_info_manager_message");
  members= new vector<Group_member_info*>();
  members->push_back(member_info);
  DBUG_VOID_RETURN;
}

Group_member_info_manager_message::~Group_member_info_manager_message()
{
  DBUG_ENTER("Group_member_info_manager_message::~Group_member_info_manager_message");
  clear_members();
  delete members;
  DBUG_VOID_RETURN;
}

void Group_member_info_manager_message::clear_members()
{
  DBUG_ENTER("Group_member_info_manager_message::clear_members");
  std::vector<Group_member_info*>::iterator it;
  for(it= members->begin(); it != members->end(); it++)
  {
    delete (*it);
  }
  members->clear();
  DBUG_VOID_RETURN;
}

std::vector<Group_member_info*>*
Group_member_info_manager_message::get_all_members()
{
  DBUG_ENTER("Group_member_info_manager_message::get_all_members");
  vector<Group_member_info*>* all_members= new vector<Group_member_info*>();

  std::vector<Group_member_info*>::iterator it;
  for(it= members->begin(); it != members->end(); it++)
  {
    Group_member_info* member_copy = new Group_member_info(*(*it));
    all_members->push_back(member_copy);
  }

  DBUG_RETURN(all_members);
}

void
Group_member_info_manager_message::encode_payload(std::vector<unsigned char>* buffer) const
{
  DBUG_ENTER("Group_member_info_manager_message::encode_payload");

  uint16 number_of_members= (uint16)members->size();
  encode_payload_item_int2(buffer, PIT_MEMBERS_NUMBER,
                           number_of_members);

  std::vector<Group_member_info*>::iterator it;
  for(it= members->begin(); it != members->end(); it++)
  {
    std::vector<uchar> encoded_member;
    (*it)->encode(&encoded_member);

    encode_payload_item_type_and_length(buffer, PIT_MEMBER_DATA,
                                        encoded_member.size());
    buffer->insert(buffer->end(), encoded_member.begin(), encoded_member.end());
  }

  DBUG_VOID_RETURN;
}

void
Group_member_info_manager_message::decode_payload(const unsigned char* buffer,
                                                  const unsigned char* end)
{
  DBUG_ENTER("Group_member_info_manager_message::decode_payload");
  const unsigned char *slider= buffer;
  uint16 payload_item_type= 0;
  unsigned long long payload_item_length= 0;

  uint16 number_of_members= 0;
  decode_payload_item_int2(&slider,
                           &payload_item_type,
                           &number_of_members);

  clear_members();
  for(uint16 i= 0; i < number_of_members; i++)
  {
    decode_payload_item_type_and_length(&slider,
                                        &payload_item_type,
                                        &payload_item_length);
    Group_member_info* member= new Group_member_info(slider,
                                                     payload_item_length);
    members->push_back(member);
    slider+= payload_item_length;
  }

  DBUG_VOID_RETURN;
}