git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/quit.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2010 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include <libmemcached/common.h>
  39
  40 /*
  41   This closes all connections (forces flush of input as well).
  42
  43   Maybe add a host specific, or key specific version?
  44
  45   The reason we send "quit" is that in case we have buffered IO, this
  46   will force data to be completed.
  47 */
  48
  49 void memcached_quit_server(org::libmemcached::Instance* instance, bool io_death)
  50 {
  51   if (instance->valid())
  52   {
  53     if (io_death == false and memcached_is_udp(instance->root) == false and instance->is_shutting_down() == false)
  54     {
  55       memcached_return_t rc;
  56       if (instance->root->flags.binary_protocol)
  57       {
  58         protocol_binary_request_quit request= {}; // = {.bytes= {0}};
  59
  60         initialize_binary_request(instance, request.message.header);
  61
  62         request.message.header.request.opcode = PROTOCOL_BINARY_CMD_QUIT;
  63         request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
  64
  65         libmemcached_io_vector_st vector[]=
  66         {
  67           { request.bytes, sizeof(request.bytes) }
  68         };
  69
  70         rc= memcached_vdo(instance, vector, 1, true);
  71       }
  72       else
  73       {
  74         libmemcached_io_vector_st vector[]=
  75         {
  76           { memcached_literal_param("quit\r\n") }
  77         };
  78
  79         rc= memcached_vdo(instance, vector, 1, true);
  80       }
  81
  82       instance->start_close_socket();
  83
  84       /* read until socket is closed, or there is an error
  85        * closing the socket before all data is read
  86        * results in server throwing away all data which is
  87        * not read
  88        *
  89        * In .40 we began to only do this if we had been doing buffered
  90        * requests of had replication enabled.
  91        */
  92       if (memcached_success(rc) and (instance->root->flags.buffer_requests or instance->root->number_of_replicas))
  93       {
  94         if (0)
  95         {
  96           memcached_return_t rc_slurp;
  97           while (memcached_continue(rc_slurp= memcached_io_slurp(instance))) {} ;
  98           WATCHPOINT_ASSERT(rc_slurp == MEMCACHED_CONNECTION_FAILURE);
  99         }
 100         else
 101         {
 102           memcached_io_slurp(instance);
 103         }
 104       }
 105
 106       /*
 107        * memcached_io_read may call memcached_quit_server with io_death if
 108        * it encounters problems, but we don't care about those occurences.
 109        * The intention of that loop is to drain the data sent from the
 110        * server to ensure that the server processed all of the data we
 111        * sent to the server.
 112        */
 113       instance->server_failure_counter= 0;
 114     }
 115
 116   }
 117
 118   instance->close_socket();
 119
 120   instance->state= MEMCACHED_SERVER_STATE_NEW;
 121   instance->cursor_active_= 0;
 122   instance->io_bytes_sent= 0;
 123   instance->write_buffer_offset= size_t(instance->root and memcached_is_udp(instance->root) ? UDP_DATAGRAM_HEADER_LENGTH : 0);
 124   instance->read_buffer_length= 0;
 125   instance->read_ptr= instance->read_buffer;
 126   instance->options.is_shutting_down= false;
 127   memcached_server_response_reset(instance);
 128
 129   // We reset the version so that if we end up talking to a different server
 130   // we don't have stale server version information.
 131   instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
 132
 133   if (io_death)
 134   {
 135     memcached_mark_server_for_timeout(instance);
 136   }
 137 }
 138
 139 void send_quit(memcached_st *memc)
 140 {
 141   for (uint32_t x= 0; x < memcached_server_count(memc); x++)
 142   {
 143     org::libmemcached::Instance* instance= memcached_instance_fetch(memc, x);
 144
 145     memcached_quit_server(instance, false);
 146   }
 147 }
 148
 149 void memcached_quit(memcached_st *memc)
 150 {
 151   memcached_return_t rc;
 152   if (memcached_failed(rc= initialize_query(memc, true)))
 153   {
 154     return;
 155   }
 156
 157   send_quit(memc);
 158 }