~drizzle-trunk/drizzle/development

/* 

 * Copyright (C) 2009, Padraig O'Sullivan

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *   * Redistributions of source code must retain the above copyright notice,

 *     this list of conditions and the following disclaimer.

 *   * Redistributions in binary form must reproduce the above copyright notice,

 *     this list of conditions and the following disclaimer in the documentation

 *     and/or other materials provided with the distribution.

 *   * Neither the name of Padraig O'Sullivan nor the names of its contributors

 *     may be used to endorse or promote products derived from this software

 *     without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <config.h>

#include "analysis_table.h"

#include "sysvar_holder.h"

#include <drizzled/error.h>

#include <libmemcached/memcached.h>

#include <libmemcached/server.h>

namespace drizzle_plugin

{

AnalysisTableTool::AnalysisTableTool() :

  plugin::TableFunction("DATA_DICTIONARY", "MEMCACHED_ANALYSIS")

{

  add_field("SERVERS_ANALYZED", plugin::TableFunction::NUMBER);

  add_field("AVERAGE_ITEM_SIZE", plugin::TableFunction::NUMBER);

  add_field("NODE_WITH_MOST_MEM_CONSUMPTION");

  add_field("USED_BYTES", plugin::TableFunction::NUMBER);

  add_field("NODE_WITH_LEAST_FREE_SPACE");

  add_field("FREE_BYTES", plugin::TableFunction::NUMBER);

  add_field("NODE_WITH_LONGEST_UPTIME");

  add_field("LONGEST_UPTIME", plugin::TableFunction::NUMBER);

  add_field("POOL_WIDE_HIT_RATIO", plugin::TableFunction::NUMBER); 

}

AnalysisTableTool::Generator::Generator(Field **arg) :

  plugin::TableFunction::Generator(arg)

{

  is_done= false;

}

bool AnalysisTableTool::Generator::populate()

{

  if (is_done)

  {

    return false;

  }

  is_done= true;

  drizzled::sys_var *servers_var= drizzled::find_sys_var("memcached_stats_servers");

  assert(servers_var != NULL);

  const string servers_string(static_cast<char *>(servers_var.value_ptr(NULL, 0, NULL)));

  if (servers_string.empty()) 

  {       

    my_printf_error(ER_UNKNOWN_ERROR, _("No value in MEMCACHED_STATS_SERVERS variable."), MYF(0));

    return false;

  }    

  memcached_return rc;

  memcached_st *serv= memcached_create(NULL);

  memcached_server_st *tmp_serv=

    memcached_servers_parse(servers_string.c_str());

  memcached_server_push(serv, tmp_serv);

  memcached_server_list_free(tmp_serv);

  memcached_stat_st *stats= memcached_stat(serv, NULL, &rc);

  memcached_server_st *servers= memcached_server_list(serv);

  uint32_t server_count= memcached_server_count(serv);

  if (server_count > 1)

  {

    memcached_analysis_st *report= memcached_analyze(serv, stats, &rc);

    push(static_cast<uint64_t>(server_count));

    push(static_cast<uint64_t>(report->average_item_size));

    push(memcached_server_name(serv, servers[report->most_consumed_server]));

    push(report->most_used_bytes);

    push(memcached_server_name(serv, servers[report->least_free_server]));

    push(report->least_remaining_bytes);

    push(memcached_server_name(serv, servers[report->oldest_server]));

    push(static_cast<uint64_t>(report->longest_uptime));

    push(static_cast<int64_t>(report->pool_hit_ratio));

    free(report);

  } 

  memcached_stat_free(serv, stats);

  memcached_free(serv);

  return true;

}

} /* namespace drizzle_plugin */