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(memcached_server_st *ptr, bool io_death)
  50 {
  51   if (ptr->fd != INVALID_SOCKET)
  52   {
  53     if (io_death == false && ptr->type != MEMCACHED_CONNECTION_UDP && ptr->options.is_shutting_down == false)
  54     {
  55       ptr->options.is_shutting_down= true;
  56
  57       memcached_return_t rc;
  58       if (ptr->root->flags.binary_protocol)
  59       {
  60         protocol_binary_request_quit request= {}; // = {.bytes= {0}};
  61         request.message.header.request.magic = PROTOCOL_BINARY_REQ;
  62         request.message.header.request.opcode = PROTOCOL_BINARY_CMD_QUIT;
  63         request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
  64         rc= memcached_do(ptr, request.bytes, sizeof(request.bytes), true);
  65       }
  66       else
  67       {
  68         rc= memcached_do(ptr, memcached_literal_param("quit\r\n"), true);
  69       }
  70
  71       WATCHPOINT_ASSERT(rc == MEMCACHED_SUCCESS or rc == MEMCACHED_FETCH_NOTFINISHED);
  72
  73       /* read until socket is closed, or there is an error
  74        * closing the socket before all data is read
  75        * results in server throwing away all data which is
  76        * not read
  77        *
  78        * In .40 we began to only do this if we had been doing buffered
  79        * requests of had replication enabled.
  80        */
  81       if (ptr->root->flags.buffer_requests or ptr->root->number_of_replicas)
  82       {
  83         memcached_return_t rc_slurp;
  84         while (memcached_continue(rc_slurp= memcached_io_slurp(ptr))) {} ;
  85         WATCHPOINT_ASSERT(rc_slurp == MEMCACHED_CONNECTION_FAILURE);
  86       }
  87
  88       /*
  89        * memcached_io_read may call memcached_quit_server with io_death if
  90        * it encounters problems, but we don't care about those occurences.
  91        * The intention of that loop is to drain the data sent from the
  92        * server to ensure that the server processed all of the data we
  93        * sent to the server.
  94        */
  95       ptr->server_failure_counter= 0;
  96     }
  97     memcached_io_close(ptr);
  98   }
  99
 100   ptr->state= MEMCACHED_SERVER_STATE_NEW;
 101   ptr->cursor_active= 0;
 102   ptr->io_bytes_sent= 0;
 103   ptr->write_buffer_offset= (size_t) ((ptr->type == MEMCACHED_CONNECTION_UDP) ? UDP_DATAGRAM_HEADER_LENGTH : 0);
 104   ptr->read_buffer_length= 0;
 105   ptr->read_ptr= ptr->read_buffer;
 106   ptr->options.is_shutting_down= false;
 107   memcached_server_response_reset(ptr);
 108
 109   // We reset the version so that if we end up talking to a different server
 110   // we don't have stale server version information.
 111   ptr->major_version= ptr->minor_version= ptr->micro_version= UINT8_MAX;
 112
 113   if (io_death)
 114   {
 115     ptr->server_failure_counter++;
 116     set_last_disconnected_host(ptr);
 117   }
 118 }
 119
 120 void send_quit(memcached_st *ptr)
 121 {
 122   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 123   {
 124     memcached_server_write_instance_st instance=
 125       memcached_server_instance_fetch(ptr, x);
 126
 127     memcached_quit_server(instance, false);
 128   }
 129 }
 130
 131 void memcached_quit(memcached_st *ptr)
 132 {
 133   if (memcached_failed(initialize_query(ptr)))
 134   {
 135     return;
 136   }
 137
 138   send_quit(ptr);
 139 }