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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(org::libmemcached::Instance* 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     fprintf(stderr, "%s\n", memcached_strerror(NULL, rc));
  58     assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
  59     *value= UINT64_MAX;
  60   }
  61   else
  62   {
  63     *value= instance->root->result.numeric_value;
  64   }
  65 }
  66
  67 static memcached_return_t text_incr_decr(org::libmemcached::Instance* instance,
  68                                          const bool is_incr,
  69                                          const char *key, size_t key_length,
  70                                          const uint64_t offset,
  71                                          const bool reply)
  72 {
  73   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  74
  75   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  76   if (size_t(send_length) >= sizeof(buffer) or send_length < 0)
  77   {
  78     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  79                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  80   }
  81
  82   libmemcached_io_vector_st vector[]=
  83   {
  84     { NULL, 0 },
  85     { memcached_literal_param("incr ") },
  86     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  87     { key, key_length },
  88     { buffer, size_t(send_length) },
  89     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  90     { memcached_literal_param("\r\n") }
  91   };
  92
  93   if (is_incr == false)
  94   {
  95     vector[1].buffer= "decr ";
  96   }
  97
  98   return memcached_vdo(instance, vector, 7, true);
  99 }
 100
 101 static memcached_return_t binary_incr_decr(org::libmemcached::Instance* instance,
 102                                            protocol_binary_command cmd,
 103                                            const char *key, const size_t key_length,
 104                                            const uint64_t offset,
 105                                            const uint64_t initial,
 106                                            const uint32_t expiration,
 107                                            const bool reply)
 108 {
 109   if (reply == false)
 110   {
 111     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 112     {
 113       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 114     }
 115
 116     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 117     {
 118       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 119     }
 120   }
 121   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 122
 123   initialize_binary_request(instance, request.message.header);
 124
 125   request.message.header.request.opcode= cmd;
 126   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
 127   request.message.header.request.extlen= 20;
 128   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 129   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
 130   request.message.body.delta= memcached_htonll(offset);
 131   request.message.body.initial= memcached_htonll(initial);
 132   request.message.body.expiration= htonl((uint32_t) expiration);
 133
 134   libmemcached_io_vector_st vector[]=
 135   {
 136     { NULL, 0 },
 137     { request.bytes, sizeof(request.bytes) },
 138     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
 139     { key, key_length }
 140   };
 141
 142   return memcached_vdo(instance, vector, 4, true);
 143 }
 144
 145 memcached_return_t memcached_increment(memcached_st *memc,
 146                                        const char *key, size_t key_length,
 147                                        uint32_t offset,
 148                                        uint64_t *value)
 149 {
 150   return memcached_increment_by_key(memc, key, key_length, key, key_length, offset, value);
 151 }
 152
 153 static memcached_return_t increment_decrement_by_key(const protocol_binary_command command,
 154                                                      Memcached *memc,
 155                                                      const char *group_key, size_t group_key_length,
 156                                                      const char *key, size_t key_length,
 157                                                      uint64_t offset,
 158                                                      uint64_t *value)
 159 {
 160   uint64_t local_value;
 161   if (value == NULL)
 162   {
 163     value= &local_value;
 164   }
 165
 166   memcached_return_t rc;
 167   if (memcached_failed(rc= initialize_query(memc, true)))
 168   {
 169     return rc;
 170   }
 171
 172   if (memcached_is_encrypted(memc))
 173   {
 174     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 175                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 176   }
 177
 178   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 179   {
 180     return memcached_last_error(memc);
 181   }
 182
 183   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 184   org::libmemcached::Instance* instance= memcached_instance_fetch(memc, server_key);
 185
 186   bool reply= memcached_is_replying(instance->root);
 187
 188   if (memcached_is_binary(memc))
 189   {
 190     rc= binary_incr_decr(instance, command,
 191                          key, key_length,
 192                          uint64_t(offset), 0, MEMCACHED_EXPIRATION_NOT_ADD,
 193                          reply);
 194   }
 195   else
 196   {
 197     rc= text_incr_decr(instance,
 198                        command == PROTOCOL_BINARY_CMD_INCREMENT ? true : false,
 199                        key, key_length,
 200                        offset, reply);
 201   }
 202
 203   auto_response(instance, reply, rc, value);
 204
 205   return rc;
 206 }
 207
 208 static memcached_return_t increment_decrement_with_initial_by_key(const protocol_binary_command command,
 209                                                                   Memcached *memc,
 210                                                                   const char *group_key,
 211                                                                   size_t group_key_length,
 212                                                                   const char *key,
 213                                                                   size_t key_length,
 214                                                                   uint64_t offset,
 215                                                                   uint64_t initial,
 216                                                                   time_t expiration,
 217                                                                   uint64_t *value)
 218 {
 219   uint64_t local_value;
 220   if (value == NULL)
 221   {
 222     value= &local_value;
 223   }
 224
 225   memcached_return_t rc;
 226   if (memcached_failed(rc= initialize_query(memc, true)))
 227   {
 228     return rc;
 229   }
 230
 231   if (memcached_is_encrypted(memc))
 232   {
 233     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 234                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 235   }
 236
 237   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 238   {
 239     return memcached_last_error(memc);
 240   }
 241
 242   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 243   org::libmemcached::Instance* instance= memcached_instance_fetch(memc, server_key);
 244
 245   bool reply= memcached_is_replying(instance->root);
 246
 247   if (memcached_is_binary(memc))
 248   {
 249     rc= binary_incr_decr(instance, command,
 250                          key, key_length,
 251                          offset, initial, uint32_t(expiration),
 252                          reply);
 253
 254   }
 255   else
 256   {
 257     rc=  memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 258                              memcached_literal_param("memcached_increment_with_initial_by_key() is not supported via the ASCII protocol"));
 259   }
 260
 261   auto_response(instance, reply, rc, value);
 262
 263   return rc;
 264 }
 265
 266 memcached_return_t memcached_decrement(memcached_st *memc,
 267                                        const char *key, size_t key_length,
 268                                        uint32_t offset,
 269                                        uint64_t *value)
 270 {
 271   return memcached_decrement_by_key(memc, key, key_length, key, key_length, offset, value);
 272 }
 273
 274
 275 memcached_return_t memcached_increment_by_key(memcached_st *shell,
 276                                               const char *group_key, size_t group_key_length,
 277                                               const char *key, size_t key_length,
 278                                               uint64_t offset,
 279                                               uint64_t *value)
 280 {
 281   Memcached* memc= memcached2Memcached(shell);
 282   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 283   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 284                                                     memc,
 285                                                     group_key, group_key_length,
 286                                                     key, key_length,
 287                                                     offset, value);
 288
 289   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 290
 291   return rc;
 292 }
 293
 294 memcached_return_t memcached_decrement_by_key(memcached_st *shell,
 295                                               const char *group_key, size_t group_key_length,
 296                                               const char *key, size_t key_length,
 297                                               uint64_t offset,
 298                                               uint64_t *value)
 299 {
 300   Memcached* memc= memcached2Memcached(shell);
 301   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 302   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 303                                                     memc,
 304                                                     group_key, group_key_length,
 305                                                     key, key_length,
 306                                                     offset, value);
 307   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 308
 309   return rc;
 310 }
 311
 312 memcached_return_t memcached_increment_with_initial(memcached_st *memc,
 313                                                     const char *key,
 314                                                     size_t key_length,
 315                                                     uint64_t offset,
 316                                                     uint64_t initial,
 317                                                     time_t expiration,
 318                                                     uint64_t *value)
 319 {
 320   return memcached_increment_with_initial_by_key(memc, key, key_length,
 321                                                  key, key_length,
 322                                                  offset, initial, expiration, value);
 323 }
 324
 325 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *shell,
 326                                                            const char *group_key,
 327                                                            size_t group_key_length,
 328                                                            const char *key,
 329                                                            size_t key_length,
 330                                                            uint64_t offset,
 331                                                            uint64_t initial,
 332                                                            time_t expiration,
 333                                                            uint64_t *value)
 334 {
 335   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 336   Memcached* memc= memcached2Memcached(shell);
 337   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 338                                                                  memc,
 339                                                                  group_key, group_key_length,
 340                                                                  key, key_length,
 341                                                                  offset, initial, expiration, value);
 342   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 343
 344   return rc;
 345 }
 346
 347 memcached_return_t memcached_decrement_with_initial(memcached_st *memc,
 348                                                     const char *key,
 349                                                     size_t key_length,
 350                                                     uint64_t offset,
 351                                                     uint64_t initial,
 352                                                     time_t expiration,
 353                                                     uint64_t *value)
 354 {
 355   return memcached_decrement_with_initial_by_key(memc, key, key_length,
 356                                                  key, key_length,
 357                                                  offset, initial, expiration, value);
 358 }
 359
 360 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *shell,
 361                                                            const char *group_key,
 362                                                            size_t group_key_length,
 363                                                            const char *key,
 364                                                            size_t key_length,
 365                                                            uint64_t offset,
 366                                                            uint64_t initial,
 367                                                            time_t expiration,
 368                                                            uint64_t *value)
 369 {
 370   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 371   Memcached* memc= memcached2Memcached(shell);
 372   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 373                                                                  memc,
 374                                                                  group_key, group_key_length,
 375                                                                  key, key_length,
 376                                                                  offset, initial, expiration, value);
 377
 378   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 379
 380   return rc;
 381 }