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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 memcached_return_t text_incr_decr(memcached_server_write_instance_st instance,
  41                                          const bool is_incr,
  42                                          const char *key, size_t key_length,
  43                                          const uint64_t offset,
  44                                          const bool reply,
  45                                          uint64_t& numeric_value)
  46 {
  47   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  48
  49   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  50   if (size_t(send_length) >= sizeof(buffer) or send_length < 0)
  51   {
  52     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  53                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  54   }
  55
  56   struct libmemcached_io_vector_st vector[]=
  57   {
  58     { memcached_literal_param("incr ") },
  59     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  60     { key, key_length },
  61     { buffer, send_length },
  62     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  63     { memcached_literal_param("\r\n") }
  64   };
  65
  66   if (is_incr == false)
  67   {
  68     vector[0].buffer= "decr ";
  69   }
  70
  71   memcached_return_t rc= memcached_vdo(instance, vector, 6, true);
  72
  73   if (reply == false)
  74   {
  75     return MEMCACHED_SUCCESS;
  76   }
  77
  78   if (memcached_failed(rc))
  79   {
  80     numeric_value= UINT64_MAX;
  81     return rc;
  82   }
  83
  84   rc= memcached_response(instance, buffer, sizeof(buffer), NULL, numeric_value);
  85
  86   return memcached_set_error(*instance, rc, MEMCACHED_AT);
  87 }
  88
  89 static memcached_return_t binary_incr_decr(memcached_server_write_instance_st instance,
  90                                            protocol_binary_command cmd,
  91                                            const char *key, const size_t key_length,
  92                                            const uint64_t offset,
  93                                            const uint64_t initial,
  94                                            const uint32_t expiration,
  95                                            const bool reply,
  96                                            uint64_t *value)
  97 {
  98   if (reply == false)
  99   {
 100     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 101     {
 102       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 103     }
 104
 105     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 106     {
 107       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 108     }
 109   }
 110   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 111
 112   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 113   request.message.header.request.opcode= cmd;
 114   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
 115   request.message.header.request.extlen= 20;
 116   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 117   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
 118   request.message.body.delta= memcached_htonll(offset);
 119   request.message.body.initial= memcached_htonll(initial);
 120   request.message.body.expiration= htonl((uint32_t) expiration);
 121
 122   struct libmemcached_io_vector_st vector[]=
 123   {
 124     { request.bytes, sizeof(request.bytes) },
 125     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
 126     { key, key_length }
 127   };
 128
 129   memcached_return_t rc;
 130   if (memcached_failed(rc= memcached_vdo(instance, vector, 3, true)))
 131   {
 132     memcached_io_reset(instance);
 133     return MEMCACHED_WRITE_FAILURE;
 134   }
 135
 136   if (reply == false)
 137   {
 138     return MEMCACHED_SUCCESS;
 139   }
 140
 141   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 142 }
 143
 144 memcached_return_t memcached_increment(memcached_st *ptr,
 145                                        const char *key, size_t key_length,
 146                                        uint32_t offset,
 147                                        uint64_t *value)
 148 {
 149   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 150 }
 151
 152 memcached_return_t memcached_decrement(memcached_st *ptr,
 153                                        const char *key, size_t key_length,
 154                                        uint32_t offset,
 155                                        uint64_t *value)
 156 {
 157   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 158 }
 159
 160 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 161                                               const char *group_key, size_t group_key_length,
 162                                               const char *key, size_t key_length,
 163                                               uint64_t offset,
 164                                               uint64_t *value)
 165 {
 166   memcached_return_t rc;
 167   uint64_t local_value;
 168   if (value == NULL)
 169   {
 170     value= &local_value;
 171   }
 172
 173   if (memcached_failed(rc= initialize_query(ptr)))
 174   {
 175     return rc;
 176   }
 177
 178   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 179   {
 180     return rc;
 181   }
 182
 183   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 184   {
 185     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 186   }
 187
 188   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 189   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 190
 191   bool reply= memcached_is_replying(instance->root);
 192
 193   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 194   if (memcached_is_binary(ptr))
 195   {
 196     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_INCREMENT,
 197                          key, key_length,
 198                          uint64_t(offset), 0, MEMCACHED_EXPIRATION_NOT_ADD,
 199                          reply,
 200                          value);
 201   }
 202   else
 203   {
 204     rc= text_incr_decr(instance, true, key, key_length, offset, reply, *value);
 205   }
 206
 207   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 208
 209   return rc;
 210 }
 211
 212 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 213                                               const char *group_key, size_t group_key_length,
 214                                               const char *key, size_t key_length,
 215                                               uint64_t offset,
 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(ptr)))
 226   {
 227     return rc;
 228   }
 229
 230   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 231   {
 232     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 233   }
 234
 235
 236   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 237   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 238
 239   bool reply= memcached_is_replying(instance->root);
 240
 241   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 242   if (memcached_is_binary(ptr))
 243   {
 244     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_DECREMENT,
 245                          key, key_length,
 246                          offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 247                          reply,
 248                          value);
 249   }
 250   else
 251   {
 252     rc= text_incr_decr(instance, false, key, key_length, offset, reply, *value);
 253   }
 254
 255   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 256
 257   return rc;
 258 }
 259
 260 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 261                                                     const char *key,
 262                                                     size_t key_length,
 263                                                     uint64_t offset,
 264                                                     uint64_t initial,
 265                                                     time_t expiration,
 266                                                     uint64_t *value)
 267 {
 268   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 269                                                  key, key_length,
 270                                                  offset, initial, expiration, value);
 271 }
 272
 273 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 274                                                          const char *group_key,
 275                                                          size_t group_key_length,
 276                                                          const char *key,
 277                                                          size_t key_length,
 278                                                          uint64_t offset,
 279                                                          uint64_t initial,
 280                                                          time_t expiration,
 281                                                          uint64_t *value)
 282 {
 283   uint64_t local_value;
 284   if (value == NULL)
 285   {
 286     value= &local_value;
 287   }
 288
 289   memcached_return_t rc;
 290   if (memcached_failed(rc= initialize_query(ptr)))
 291   {
 292     return rc;
 293   }
 294
 295   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 296   {
 297     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 298   }
 299
 300   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 301   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 302
 303   bool reply= memcached_is_replying(instance->root);
 304
 305   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 306   if (memcached_is_binary(ptr))
 307   {
 308     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_INCREMENT,
 309                          key, key_length,
 310                          offset, initial, uint32_t(expiration),
 311                          reply,
 312                          value);
 313   }
 314   else
 315   {
 316     rc= MEMCACHED_PROTOCOL_ERROR;
 317   }
 318
 319   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 320
 321   return rc;
 322 }
 323
 324 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 325                                                     const char *key,
 326                                                     size_t key_length,
 327                                                     uint64_t offset,
 328                                                     uint64_t initial,
 329                                                     time_t expiration,
 330                                                     uint64_t *value)
 331 {
 332   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 333                                                  key, key_length,
 334                                                  offset, initial, expiration, value);
 335 }
 336
 337 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 338                                                            const char *group_key,
 339                                                            size_t group_key_length,
 340                                                            const char *key,
 341                                                            size_t key_length,
 342                                                            uint64_t offset,
 343                                                            uint64_t initial,
 344                                                            time_t expiration,
 345                                                            uint64_t *value)
 346 {
 347   uint64_t local_value;
 348   if (value == NULL)
 349   {
 350     value= &local_value;
 351   }
 352
 353   memcached_return_t rc;
 354   if (memcached_failed(rc= initialize_query(ptr)))
 355   {
 356     return rc;
 357   }
 358
 359   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 360   {
 361     return memcached_set_error(*ptr, rc, MEMCACHED_AT);
 362   }
 363
 364   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 365   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 366
 367   bool reply= memcached_is_replying(instance->root);
 368
 369
 370   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 371   if (memcached_is_binary(ptr))
 372   {
 373     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_DECREMENT,
 374                          key, key_length,
 375                          offset, initial, uint32_t(expiration),
 376                          reply,
 377                          value);
 378   }
 379   else
 380   {
 381     rc= MEMCACHED_PROTOCOL_ERROR;
 382   }
 383
 384   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 385
 386   return rc;
 387 }