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       memcached_return_t rc;
  56       char buffer[MEMCACHED_MAX_BUFFER];
  57
  58       ptr->options.is_shutting_down= true;
  59
  60       if (ptr->root->flags.binary_protocol)
  61       {
  62         protocol_binary_request_quit request= {}; // = {.bytes= {0}};
  63         request.message.header.request.magic = PROTOCOL_BINARY_REQ;
  64         request.message.header.request.opcode = PROTOCOL_BINARY_CMD_QUIT;
  65         request.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
  66         rc= memcached_do(ptr, request.bytes, sizeof(request.bytes), true);
  67       }
  68       else
  69       {
  70         rc= memcached_do(ptr, memcached_literal_param("quit\r\n"), true);
  71       }
  72
  73       WATCHPOINT_ASSERT(rc == MEMCACHED_SUCCESS || rc == MEMCACHED_FETCH_NOTFINISHED);
  74       (void)rc; // Shut up ICC
  75
  76       /* read until socket is closed, or there is an error
  77        * closing the socket before all data is read
  78        * results in server throwing away all data which is
  79        * not read
  80        *
  81        * In .40 we began to only do this if we had been doing buffered
  82        * requests of had replication enabled.
  83        */
  84       if (ptr->root->flags.buffer_requests || ptr->root->number_of_replicas)
  85       {
  86         ssize_t nread;
  87         while (memcached_success(memcached_io_read(ptr, buffer, sizeof(buffer)/sizeof(*buffer), &nread))) {} ;
  88       }
  89
  90
  91       /*
  92        * memcached_io_read may call memcached_quit_server with io_death if
  93        * it encounters problems, but we don't care about those occurences.
  94        * The intention of that loop is to drain the data sent from the
  95        * server to ensure that the server processed all of the data we
  96        * sent to the server.
  97        */
  98       ptr->server_failure_counter= 0;
  99     }
 100     memcached_io_close(ptr);
 101   }
 102
 103   ptr->state= MEMCACHED_SERVER_STATE_NEW;
 104   ptr->cursor_active= 0;
 105   ptr->io_bytes_sent= 0;
 106   ptr->write_buffer_offset= (size_t) ((ptr->type == MEMCACHED_CONNECTION_UDP) ? UDP_DATAGRAM_HEADER_LENGTH : 0);
 107   ptr->read_buffer_length= 0;
 108   ptr->read_ptr= ptr->read_buffer;
 109   ptr->options.is_shutting_down= false;
 110   memcached_server_response_reset(ptr);
 111
 112   // We reset the version so that if we end up talking to a different server
 113   // we don't have stale server version information.
 114   ptr->major_version= ptr->minor_version= ptr->micro_version= UINT8_MAX;
 115
 116   if (io_death)
 117   {
 118     ptr->server_failure_counter++;
 119     set_last_disconnected_host(ptr);
 120   }
 121 }
 122
 123 void send_quit(memcached_st *ptr)
 124 {
 125   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 126   {
 127     memcached_server_write_instance_st instance=
 128       memcached_server_instance_fetch(ptr, x);
 129
 130     memcached_quit_server(instance, false);
 131   }
 132 }
 133
 134 void memcached_quit(memcached_st *ptr)
 135 {
 136   if (memcached_failed(initialize_query(ptr)))
 137   {
 138     return;
 139   }
 140
 141   send_quit(ptr);
 142 }