git.m6w6.name Git - awesomized/libmemcached/blob - src/libmemcachedutil/version.cc

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached-awesome - C/C++ Client Library for memcached          |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020-2021 Michael Wallner        https://awesome.co/ |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "libmemcachedutil/common.h"
  17 #include <cassert>
  18
  19 struct local_context {
  20   uint8_t major_version;
  21   uint8_t minor_version;
  22   uint8_t micro_version;
  23
  24   bool truth;
  25 };
  26
  27 static memcached_return_t
  28 check_server_version(const memcached_st *, const memcached_instance_st *instance, void *context) {
  29   /* Do Nothing */
  30   struct local_context *check = (struct local_context *) context;
  31
  32   if (memcached_server_major_version(instance) != UINT8_MAX) {
  33     uint32_t sv, cv;
  34
  35     sv = memcached_server_micro_version(instance) | memcached_server_minor_version(instance) << 8
  36         | memcached_server_major_version(instance) << 16;
  37     cv = check->micro_version | check->minor_version << 8 | check->major_version << 16;
  38
  39     if (sv >= cv) {
  40       return MEMCACHED_SUCCESS;
  41     }
  42   }
  43
  44   check->truth = false;
  45
  46   return MEMCACHED_FAILURE;
  47 }
  48
  49 bool libmemcached_util_version_check(memcached_st *memc, uint8_t major_version,
  50                                      uint8_t minor_version, uint8_t micro_version) {
  51   if (memcached_failed(memcached_version(memc))) {
  52     return false;
  53   }
  54
  55   struct local_context check = {major_version, minor_version, micro_version, true};
  56
  57   memcached_server_fn callbacks[1];
  58   callbacks[0] = check_server_version;
  59   memcached_server_cursor(memc, callbacks, (void *) &check, 1);
  60
  61   return check.truth;
  62 }