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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.
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  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.
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  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   uint32_t success= 0;
  52   bool errors_happened= false;
  53   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
  54   {
  55     org::libmemcached::Instance* instance= memcached_instance_fetch(ptr, x);
  56
  57     // Optimization, we only fetch version once.
  58     if (instance->major_version != UINT8_MAX)
  59     {
  60       continue;
  61     }
  62
  63     memcached_return_t rrc;
  64     if (memcached_failed(rrc= memcached_vdo(instance, vector, 1, true)))
  65     {
  66       errors_happened= true;
  67       (void)memcached_set_error(*instance, rrc, MEMCACHED_AT);
  68       continue;
  69     }
  70     success++;
  71   }
  72
  73   if (success)
  74   {
  75     // Collect the returned items
  76     org::libmemcached::Instance* instance;
  77     while ((instance= memcached_io_get_readable_server(ptr)))
  78     {
  79       memcached_return_t rrc= memcached_response(instance, NULL);
  80       if (memcached_failed(rrc))
  81       {
  82         memcached_io_reset(instance);
  83         errors_happened= true;
  84       }
  85     }
  86   }
  87
  88   return errors_happened ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
  89 }
  90
  91 static inline memcached_return_t memcached_version_binary(memcached_st *ptr)
  92 {
  93   protocol_binary_request_version request= {};
  94
  95   request.message.header.request.opcode= PROTOCOL_BINARY_CMD_VERSION;
  96   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
  97
  98   libmemcached_io_vector_st vector[]=
  99   {
 100     { request.bytes, sizeof(request.bytes) }
 101   };
 102
 103   uint32_t success= 0;
 104   bool errors_happened= false;
 105   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 106   {
 107     org::libmemcached::Instance* instance= memcached_instance_fetch(ptr, x);
 108
 109     initialize_binary_request(instance, request.message.header);
 110
 111     if (instance->major_version != UINT8_MAX)
 112     {
 113       continue;
 114     }
 115
 116     memcached_return_t rrc= memcached_vdo(instance, vector, 1, true);
 117     if (memcached_failed(rrc))
 118     {
 119       memcached_io_reset(instance);
 120       errors_happened= true;
 121       continue;
 122     }
 123
 124     success++;
 125   }
 126
 127   if (success)
 128   {
 129     // Collect the returned items
 130     org::libmemcached::Instance* instance;
 131     while ((instance= memcached_io_get_readable_server(ptr)))
 132     {
 133       char buffer[32];
 134       memcached_return_t rrc= memcached_response(instance, buffer, sizeof(buffer), NULL);
 135       if (memcached_failed(rrc))
 136       {
 137         memcached_io_reset(instance);
 138         errors_happened= true;
 139       }
 140     }
 141   }
 142
 143   return errors_happened ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 144 }
 145
 146 static inline void version_ascii_instance(org::libmemcached::Instance* instance)
 147 {
 148   if (instance->major_version != UINT8_MAX)
 149   {
 150     libmemcached_io_vector_st vector[]=
 151     {
 152       { memcached_literal_param("version\r\n") },
 153     };
 154
 155     (void)memcached_vdo(instance, vector, 1, false);
 156   }
 157 }
 158
 159 static inline void version_binary_instance(org::libmemcached::Instance* instance)
 160 {
 161   if (instance->major_version != UINT8_MAX)
 162   {
 163     protocol_binary_request_version request= {};
 164
 165     request.message.header.request.opcode= PROTOCOL_BINARY_CMD_VERSION;
 166     request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 167
 168     libmemcached_io_vector_st vector[]=
 169     {
 170       { request.bytes, sizeof(request.bytes) }
 171     };
 172
 173     initialize_binary_request(instance, request.message.header);
 174
 175     (void)memcached_vdo(instance, vector, 1, false);
 176   }
 177 }
 178
 179 void memcached_version_instance(org::libmemcached::Instance* instance)
 180 {
 181   if (instance)
 182   {
 183     if (memcached_has_root(instance))
 184     {
 185       if (memcached_is_fetching_version(instance->root))
 186       {
 187         if (memcached_is_udp(instance->root) == false)
 188         {
 189
 190           if (memcached_is_binary(instance->root))
 191           {
 192             version_binary_instance(instance);
 193             return;
 194           }
 195
 196           version_ascii_instance(instance);
 197         }
 198       }
 199     }
 200   }
 201 }
 202
 203 memcached_return_t memcached_version(memcached_st *ptr)
 204 {
 205   if (ptr)
 206   {
 207     memcached_return_t rc;
 208     if (memcached_failed(rc= initialize_query(ptr, true)))
 209     {
 210       return rc;
 211     }
 212
 213     if (memcached_is_udp(ptr))
 214     {
 215       return MEMCACHED_NOT_SUPPORTED;
 216     }
 217
 218     if (memcached_is_binary(ptr))
 219     {
 220       return memcached_version_binary(ptr);
 221     }
 222
 223     return memcached_version_textual(ptr);
 224   }
 225
 226   return MEMCACHED_INVALID_ARGUMENTS;
 227 }