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Dir : ~/usr/local/src/libmemcached-1.0.18/libmemcached/
View File Name : quit.cc

/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 * 
 *  Libmemcached library
 *
 *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
 *  Copyright (C) 2010 Brian Aker 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.
 *
 *      * The names of its contributors may not 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
 *  OWNER 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 <libmemcached/common.h>

namespace {
  memcached_return_t send_quit_message(memcached_instance_st* instance)
  {
    memcached_return_t rc;
    if (instance->root->flags.binary_protocol)
    {
      protocol_binary_request_quit request= {}; // = {.bytes= {0}};

      initialize_binary_request(instance, request.message.header);

      request.message.header.request.opcode = PROTOCOL_BINARY_CMD_QUIT;
      request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;

      libmemcached_io_vector_st vector[]=
      {
        { request.bytes, sizeof(request.bytes) }
      };

      rc= memcached_vdo(instance, vector, 1, true);
    }
    else
    {
      libmemcached_io_vector_st vector[]=
      {
        { memcached_literal_param("quit\r\n") }
      };

      rc= memcached_vdo(instance, vector, 1, true);
    }

    return rc;
  }

  void drain_instance(memcached_instance_st* instance)
  {
    /* read until socket is closed, or there is an error
     * closing the socket before all data is read
     * results in server throwing away all data which is
     * not read
     *
     * In .40 we began to only do this if we had been doing buffered
     * requests of had replication enabled.
     */
    if (instance->root->flags.buffer_requests or instance->root->number_of_replicas)
    {
      memcached_io_slurp(instance);
    }

    /*
     * memcached_io_read may call memcached_quit_server with io_death if
     * it encounters problems, but we don't care about those occurences.
     * The intention of that loop is to drain the data sent from the
     * server to ensure that the server processed all of the data we
     * sent to the server.
     */
    instance->server_failure_counter= 0;
    instance->server_timeout_counter= 0;
  }
}

/*
  This closes all connections (forces flush of input as well).

  Maybe add a host specific, or key specific version?

  The reason we send "quit" is that in case we have buffered IO, this
  will force data to be completed.
*/

void memcached_quit_server(memcached_instance_st* instance, bool io_death)
{
  if (instance->valid())
  {
    if (io_death == false and memcached_is_udp(instance->root) == false and instance->is_shutting_down() == false)
    {
      send_quit_message(instance);

      instance->start_close_socket();
      drain_instance(instance);
    }
  }

  instance->close_socket();

  if (io_death and memcached_is_udp(instance->root))
  {
    /*
       If using UDP, we should stop using the server briefly on every IO
       failure. If using TCP, it may be that the connection went down a
       short while ago (e.g. the server failed) and we've only just
       noticed, so we should only set the retry timeout on a connect
       failure (which doesn't call this method).
       */
    memcached_mark_server_for_timeout(instance);
  }
}

void send_quit(Memcached *memc)
{
  for (uint32_t x= 0; x < memcached_server_count(memc); x++)
  {
    memcached_instance_st* instance= memcached_instance_fetch(memc, x);

    memcached_quit_server(instance, false);
  }
}

void memcached_quit(memcached_st *shell)
{
  Memcached* memc= memcached2Memcached(shell);
  memcached_return_t rc;
  if (memcached_failed(rc= initialize_query(memc, true)))
  {
    return;
  }

  send_quit(memc);
}