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 and memcached_is_udp(ptr->root) == false and 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
  65         libmemcached_io_vector_st vector[]=
  66         {
  67           { request.bytes, sizeof(request.bytes) }
  68         };
  69
  70         rc= memcached_vdo(ptr, 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(ptr, vector, 1, true);
  80       }
  81
  82       WATCHPOINT_ASSERT(rc == MEMCACHED_SUCCESS or rc == MEMCACHED_FETCH_NOTFINISHED);
  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 (ptr->root->flags.buffer_requests or ptr->root->number_of_replicas)
  93       {
  94         memcached_return_t rc_slurp;
  95         while (memcached_continue(rc_slurp= memcached_io_slurp(ptr))) {} ;
  96         WATCHPOINT_ASSERT(rc_slurp == MEMCACHED_CONNECTION_FAILURE);
  97       }
  98
  99       /*
 100        * memcached_io_read may call memcached_quit_server with io_death if
 101        * it encounters problems, but we don't care about those occurences.
 102        * The intention of that loop is to drain the data sent from the
 103        * server to ensure that the server processed all of the data we
 104        * sent to the server.
 105        */
 106       ptr->server_failure_counter= 0;
 107     }
 108     memcached_io_close(ptr);
 109   }
 110
 111   ptr->state= MEMCACHED_SERVER_STATE_NEW;
 112   ptr->cursor_active= 0;
 113   ptr->io_bytes_sent= 0;
 114   ptr->write_buffer_offset= size_t(ptr->root and memcached_is_udp(ptr->root) ? UDP_DATAGRAM_HEADER_LENGTH : 0);
 115   ptr->read_buffer_length= 0;
 116   ptr->read_ptr= ptr->read_buffer;
 117   ptr->options.is_shutting_down= false;
 118   memcached_server_response_reset(ptr);
 119
 120   // We reset the version so that if we end up talking to a different server
 121   // we don't have stale server version information.
 122   ptr->major_version= ptr->minor_version= ptr->micro_version= UINT8_MAX;
 123
 124   if (io_death)
 125   {
 126     memcached_mark_server_for_timeout(ptr);
 127   }
 128 }
 129
 130 void send_quit(memcached_st *ptr)
 131 {
 132   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 133   {
 134     memcached_server_write_instance_st instance=
 135       memcached_server_instance_fetch(ptr, x);
 136
 137     memcached_quit_server(instance, false);
 138   }
 139 }
 140
 141 void memcached_quit(memcached_st *ptr)
 142 {
 143   memcached_return_t rc;
 144   if (memcached_failed(rc= initialize_query(ptr, true)))
 145   {
 146     return;
 147   }
 148
 149   send_quit(ptr);
 150 }