git.m6w6.name Git - awesomized/libmemcached/blob - libmemcachedutil/version.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
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  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  36  */
  37
  38
  39 #include <libmemcachedutil/common.h>
  40 #include <cassert>
  41
  42 struct local_context
  43 {
  44   uint8_t major_version;
  45   uint8_t minor_version;
  46   uint8_t micro_version;
  47
  48   bool truth;
  49 };
  50
  51 static memcached_return_t check_server_version(const memcached_st *,
  52                                                const memcached_instance_st * instance,
  53                                                void *context)
  54 {
  55   /* Do Nothing */
  56   struct local_context *check= (struct local_context *)context;
  57
  58   if (memcached_server_major_version(instance) != UINT8_MAX) {
  59     uint32_t sv, cv;
  60
  61     sv = memcached_server_micro_version(instance)
  62         |memcached_server_minor_version(instance) << 8
  63         |memcached_server_major_version(instance) << 16
  64         ;
  65     cv = check->micro_version
  66         |check->minor_version << 8
  67         |check->major_version << 16;
  68
  69     if (sv >= cv) {
  70       return MEMCACHED_SUCCESS;
  71     }
  72   }
  73
  74   check->truth= false;
  75
  76   return MEMCACHED_FAILURE;
  77 }
  78
  79 bool libmemcached_util_version_check(memcached_st *memc,
  80                                      uint8_t major_version,
  81                                      uint8_t minor_version,
  82                                      uint8_t micro_version)
  83 {
  84   if (memcached_failed(memcached_version(memc)))
  85   {
  86     return false;
  87   }
  88
  89   struct local_context check= { major_version, minor_version, micro_version, true };
  90
  91   memcached_server_fn callbacks[1];
  92   callbacks[0]= check_server_version;
  93   memcached_server_cursor(memc, callbacks, (void *)&check,  1);
  94
  95   return check.truth;
  96 }