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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) 2006-2009 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 static void auto_response(memcached_instance_st* instance, const bool reply,  memcached_return_t& rc, uint64_t* value)
  41 {
  42   // If the message was successfully sent, then get the response, otherwise
  43   // fail.
  44   if (memcached_success(rc))
  45   {
  46     if (reply == false)
  47     {
  48       *value= UINT64_MAX;
  49       return;
  50     }
  51
  52     rc= memcached_response(instance, &instance->root->result);
  53   }
  54
  55   if (memcached_fatal(rc))
  56   {
  57     assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
  58     *value= UINT64_MAX;
  59   }
  60   else
  61   {
  62     *value= instance->root->result.numeric_value;
  63   }
  64 }
  65
  66 static memcached_return_t text_incr_decr(memcached_instance_st* instance,
  67                                          const bool is_incr,
  68                                          const char *key, size_t key_length,
  69                                          const uint64_t offset,
  70                                          const bool reply)
  71 {
  72   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  73
  74   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  75   if (size_t(send_length) >= sizeof(buffer) or send_length < 0)
  76   {
  77     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  78                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  79   }
  80
  81   libmemcached_io_vector_st vector[]=
  82   {
  83     { NULL, 0 },
  84     { memcached_literal_param("incr ") },
  85     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  86     { key, key_length },
  87     { buffer, size_t(send_length) },
  88     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  89     { memcached_literal_param("\r\n") }
  90   };
  91
  92   if (is_incr == false)
  93   {
  94     vector[1].buffer= "decr ";
  95   }
  96
  97   return memcached_vdo(instance, vector, 7, true);
  98 }
  99
 100 static memcached_return_t binary_incr_decr(memcached_instance_st* instance,
 101                                            protocol_binary_command cmd,
 102                                            const char *key, const size_t key_length,
 103                                            const uint64_t offset,
 104                                            const uint64_t initial,
 105                                            const uint32_t expiration,
 106                                            const bool reply)
 107 {
 108   if (reply == false)
 109   {
 110     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 111     {
 112       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 113     }
 114
 115     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 116     {
 117       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 118     }
 119   }
 120   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 121
 122   initialize_binary_request(instance, request.message.header);
 123
 124   request.message.header.request.opcode= cmd;
 125   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
 126   request.message.header.request.extlen= 20;
 127   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 128   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
 129   request.message.body.delta= memcached_htonll(offset);
 130   request.message.body.initial= memcached_htonll(initial);
 131   request.message.body.expiration= htonl((uint32_t) expiration);
 132
 133   libmemcached_io_vector_st vector[]=
 134   {
 135     { NULL, 0 },
 136     { request.bytes, sizeof(request.bytes) },
 137     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
 138     { key, key_length }
 139   };
 140
 141   return memcached_vdo(instance, vector, 4, true);
 142 }
 143
 144 memcached_return_t memcached_increment(memcached_st *memc,
 145                                        const char *key, size_t key_length,
 146                                        uint32_t offset,
 147                                        uint64_t *value)
 148 {
 149   return memcached_increment_by_key(memc, key, key_length, key, key_length, offset, value);
 150 }
 151
 152 static memcached_return_t increment_decrement_by_key(const protocol_binary_command command,
 153                                                      Memcached *memc,
 154                                                      const char *group_key, size_t group_key_length,
 155                                                      const char *key, size_t key_length,
 156                                                      uint64_t offset,
 157                                                      uint64_t *value)
 158 {
 159   uint64_t local_value;
 160   if (value == NULL)
 161   {
 162     value= &local_value;
 163   }
 164
 165   memcached_return_t rc;
 166   if (memcached_failed(rc= initialize_query(memc, true)))
 167   {
 168     return rc;
 169   }
 170
 171   if (memcached_is_encrypted(memc))
 172   {
 173     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 174                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 175   }
 176
 177   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 178   {
 179     return memcached_last_error(memc);
 180   }
 181
 182   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 183   memcached_instance_st* instance= memcached_instance_fetch(memc, server_key);
 184
 185   bool reply= memcached_is_replying(instance->root);
 186
 187   if (memcached_is_binary(memc))
 188   {
 189     rc= binary_incr_decr(instance, command,
 190                          key, key_length,
 191                          uint64_t(offset), 0, MEMCACHED_EXPIRATION_NOT_ADD,
 192                          reply);
 193   }
 194   else
 195   {
 196     rc= text_incr_decr(instance,
 197                        command == PROTOCOL_BINARY_CMD_INCREMENT ? true : false,
 198                        key, key_length,
 199                        offset, reply);
 200   }
 201
 202   auto_response(instance, reply, rc, value);
 203
 204   return rc;
 205 }
 206
 207 static memcached_return_t increment_decrement_with_initial_by_key(const protocol_binary_command command,
 208                                                                   Memcached *memc,
 209                                                                   const char *group_key,
 210                                                                   size_t group_key_length,
 211                                                                   const char *key,
 212                                                                   size_t key_length,
 213                                                                   uint64_t offset,
 214                                                                   uint64_t initial,
 215                                                                   time_t expiration,
 216                                                                   uint64_t *value)
 217 {
 218   uint64_t local_value;
 219   if (value == NULL)
 220   {
 221     value= &local_value;
 222   }
 223
 224   memcached_return_t rc;
 225   if (memcached_failed(rc= initialize_query(memc, true)))
 226   {
 227     return rc;
 228   }
 229
 230   if (memcached_is_encrypted(memc))
 231   {
 232     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 233                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 234   }
 235
 236   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 237   {
 238     return memcached_last_error(memc);
 239   }
 240
 241   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 242   memcached_instance_st* instance= memcached_instance_fetch(memc, server_key);
 243
 244   bool reply= memcached_is_replying(instance->root);
 245
 246   if (memcached_is_binary(memc))
 247   {
 248     rc= binary_incr_decr(instance, command,
 249                          key, key_length,
 250                          offset, initial, uint32_t(expiration),
 251                          reply);
 252
 253   }
 254   else
 255   {
 256     rc=  memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 257                              memcached_literal_param("memcached_increment_with_initial_by_key() is not supported via the ASCII protocol"));
 258   }
 259
 260   auto_response(instance, reply, rc, value);
 261
 262   return rc;
 263 }
 264
 265 memcached_return_t memcached_decrement(memcached_st *memc,
 266                                        const char *key, size_t key_length,
 267                                        uint32_t offset,
 268                                        uint64_t *value)
 269 {
 270   return memcached_decrement_by_key(memc, key, key_length, key, key_length, offset, value);
 271 }
 272
 273
 274 memcached_return_t memcached_increment_by_key(memcached_st *shell,
 275                                               const char *group_key, size_t group_key_length,
 276                                               const char *key, size_t key_length,
 277                                               uint64_t offset,
 278                                               uint64_t *value)
 279 {
 280   Memcached* memc= memcached2Memcached(shell);
 281   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 282   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 283                                                     memc,
 284                                                     group_key, group_key_length,
 285                                                     key, key_length,
 286                                                     offset, value);
 287
 288   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 289
 290   return rc;
 291 }
 292
 293 memcached_return_t memcached_decrement_by_key(memcached_st *shell,
 294                                               const char *group_key, size_t group_key_length,
 295                                               const char *key, size_t key_length,
 296                                               uint64_t offset,
 297                                               uint64_t *value)
 298 {
 299   Memcached* memc= memcached2Memcached(shell);
 300   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 301   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 302                                                     memc,
 303                                                     group_key, group_key_length,
 304                                                     key, key_length,
 305                                                     offset, value);
 306   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 307
 308   return rc;
 309 }
 310
 311 memcached_return_t memcached_increment_with_initial(memcached_st *memc,
 312                                                     const char *key,
 313                                                     size_t key_length,
 314                                                     uint64_t offset,
 315                                                     uint64_t initial,
 316                                                     time_t expiration,
 317                                                     uint64_t *value)
 318 {
 319   return memcached_increment_with_initial_by_key(memc, key, key_length,
 320                                                  key, key_length,
 321                                                  offset, initial, expiration, value);
 322 }
 323
 324 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *shell,
 325                                                            const char *group_key,
 326                                                            size_t group_key_length,
 327                                                            const char *key,
 328                                                            size_t key_length,
 329                                                            uint64_t offset,
 330                                                            uint64_t initial,
 331                                                            time_t expiration,
 332                                                            uint64_t *value)
 333 {
 334   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 335   Memcached* memc= memcached2Memcached(shell);
 336   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 337                                                                  memc,
 338                                                                  group_key, group_key_length,
 339                                                                  key, key_length,
 340                                                                  offset, initial, expiration, value);
 341   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 342
 343   return rc;
 344 }
 345
 346 memcached_return_t memcached_decrement_with_initial(memcached_st *memc,
 347                                                     const char *key,
 348                                                     size_t key_length,
 349                                                     uint64_t offset,
 350                                                     uint64_t initial,
 351                                                     time_t expiration,
 352                                                     uint64_t *value)
 353 {
 354   return memcached_decrement_with_initial_by_key(memc, key, key_length,
 355                                                  key, key_length,
 356                                                  offset, initial, expiration, value);
 357 }
 358
 359 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *shell,
 360                                                            const char *group_key,
 361                                                            size_t group_key_length,
 362                                                            const char *key,
 363                                                            size_t key_length,
 364                                                            uint64_t offset,
 365                                                            uint64_t initial,
 366                                                            time_t expiration,
 367                                                            uint64_t *value)
 368 {
 369   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 370   Memcached* memc= memcached2Memcached(shell);
 371   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 372                                                                  memc,
 373                                                                  group_key, group_key_length,
 374                                                                  key, key_length,
 375                                                                  offset, initial, expiration, value);
 376
 377   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 378
 379   return rc;
 380 }