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   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,
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  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37 #include <libmemcached/common.h>
  38
  39 const char * memcached_lib_version(void)
  40 {
  41   return LIBMEMCACHED_VERSION_STRING;
  42 }
  43
  44 static inline memcached_return_t memcached_version_textual(memcached_st *ptr)
  45 {
  46   libmemcached_io_vector_st vector[]=
  47   {
  48     { memcached_literal_param("version\r\n") },
  49   };
  50
  51   bool errors_happened= false;
  52   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
  53   {
  54     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
  55
  56     // Optimization, we only fetch version once.
  57     if (instance->major_version != UINT8_MAX)
  58     {
  59       continue;
  60     }
  61
  62     memcached_return_t rrc;
  63     if (memcached_failed(rrc= memcached_vdo(instance, vector, 1, true)))
  64     {
  65       errors_happened= true;
  66       (void)memcached_set_error(*instance, rrc, MEMCACHED_AT);
  67       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
  68     }
  69     else if (memcached_failed(rrc= memcached_response(instance, NULL)))
  70     {
  71       errors_happened= true;
  72       memcached_set_error(*instance, rrc, MEMCACHED_AT);
  73       instance->major_version= instance->minor_version= instance->micro_version= UINT8_MAX;
  74     }
  75   }
  76
  77   return errors_happened ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
  78 }
  79
  80 static inline memcached_return_t memcached_version_binary(memcached_st *ptr)
  81 {
  82   protocol_binary_request_version request= {};
  83   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
  84   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_VERSION;
  85   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  86
  87   libmemcached_io_vector_st vector[]=
  88   {
  89     { request.bytes, sizeof(request.bytes) }
  90   };
  91
  92   uint32_t success= 0;
  93   bool errors_happened= false;
  94   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
  95   {
  96     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
  97
  98     if (instance->major_version != UINT8_MAX)
  99     {
 100       continue;
 101     }
 102
 103     memcached_return_t rrc= memcached_vdo(instance, vector, 1, true);
 104     if (memcached_failed(rrc))
 105     {
 106       memcached_io_reset(instance);
 107       errors_happened= true;
 108       continue;
 109     }
 110
 111     success++;
 112   }
 113
 114   if (success)
 115   {
 116     // Collect the returned items
 117     memcached_server_write_instance_st instance;
 118     while ((instance= memcached_io_get_readable_server(ptr)))
 119     {
 120       char buffer[32];
 121       memcached_return_t rrc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 122       if (memcached_failed(rrc))
 123       {
 124         memcached_io_reset(instance);
 125         errors_happened= true;
 126       }
 127     }
 128   }
 129
 130   return errors_happened ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 131 }
 132
 133 memcached_return_t memcached_version(memcached_st *ptr)
 134 {
 135   memcached_return_t rc;
 136   if (memcached_failed(rc= initialize_query(ptr, true)))
 137   {
 138     return rc;
 139   }
 140
 141   if (memcached_is_udp(ptr))
 142   {
 143     return MEMCACHED_NOT_SUPPORTED;
 144   }
 145
 146   if (memcached_is_binary(ptr))
 147   {
 148     return memcached_version_binary(ptr);
 149   }
 150
 151   return memcached_version_textual(ptr);
 152 }