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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_server_write_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_success(rc))
  56   {
  57     *value= instance->root->result.numeric_value;
  58   }
  59   else
  60   {
  61     *value= UINT64_MAX;
  62   }
  63 }
  64
  65 static memcached_return_t text_incr_decr(memcached_server_write_instance_st instance,
  66                                          const bool is_incr,
  67                                          const char *key, size_t key_length,
  68                                          const uint64_t offset,
  69                                          const bool reply)
  70 {
  71   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  72
  73   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  74   if (size_t(send_length) >= sizeof(buffer) or send_length < 0)
  75   {
  76     return memcached_set_error(*instance, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  77                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  78   }
  79
  80   libmemcached_io_vector_st vector[]=
  81   {
  82     { NULL, 0 },
  83     { memcached_literal_param("incr ") },
  84     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
  85     { key, key_length },
  86     { buffer, send_length },
  87     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  88     { memcached_literal_param("\r\n") }
  89   };
  90
  91   if (is_incr == false)
  92   {
  93     vector[1].buffer= "decr ";
  94   }
  95
  96   return memcached_vdo(instance, vector, 7, true);
  97 }
  98
  99 static memcached_return_t binary_incr_decr(memcached_server_write_instance_st instance,
 100                                            protocol_binary_command cmd,
 101                                            const char *key, const size_t key_length,
 102                                            const uint64_t offset,
 103                                            const uint64_t initial,
 104                                            const uint32_t expiration,
 105                                            const bool reply)
 106 {
 107   if (reply == false)
 108   {
 109     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 110     {
 111       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 112     }
 113
 114     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 115     {
 116       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 117     }
 118   }
 119   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 120
 121   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 122   request.message.header.request.opcode= cmd;
 123   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
 124   request.message.header.request.extlen= 20;
 125   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 126   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
 127   request.message.body.delta= memcached_htonll(offset);
 128   request.message.body.initial= memcached_htonll(initial);
 129   request.message.body.expiration= htonl((uint32_t) expiration);
 130
 131   libmemcached_io_vector_st vector[]=
 132   {
 133     { NULL, 0 },
 134     { request.bytes, sizeof(request.bytes) },
 135     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
 136     { key, key_length }
 137   };
 138
 139   return memcached_vdo(instance, vector, 4, true);
 140 }
 141
 142 memcached_return_t memcached_increment(memcached_st *ptr,
 143                                        const char *key, size_t key_length,
 144                                        uint32_t offset,
 145                                        uint64_t *value)
 146 {
 147   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 148 }
 149
 150 memcached_return_t memcached_decrement(memcached_st *ptr,
 151                                        const char *key, size_t key_length,
 152                                        uint32_t offset,
 153                                        uint64_t *value)
 154 {
 155   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 156 }
 157
 158 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 159                                               const char *group_key, size_t group_key_length,
 160                                               const char *key, size_t key_length,
 161                                               uint64_t offset,
 162                                               uint64_t *value)
 163 {
 164   memcached_return_t rc;
 165   uint64_t local_value;
 166   if (value == NULL)
 167   {
 168     value= &local_value;
 169   }
 170
 171   if (memcached_failed(rc= initialize_query(ptr, true)))
 172   {
 173     return rc;
 174   }
 175
 176   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 177   {
 178     return rc;
 179   }
 180
 181   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 182   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 183
 184   bool reply= memcached_is_replying(instance->root);
 185
 186   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 187   if (memcached_is_binary(ptr))
 188   {
 189     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_INCREMENT,
 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, true, key, key_length, offset, reply);
 197   }
 198
 199   auto_response(instance, reply, rc, value);
 200
 201   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 202
 203   return rc;
 204 }
 205
 206 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 207                                               const char *group_key, size_t group_key_length,
 208                                               const char *key, size_t key_length,
 209                                               uint64_t offset,
 210                                               uint64_t *value)
 211 {
 212   uint64_t local_value;
 213   if (value == NULL)
 214   {
 215     value= &local_value;
 216   }
 217
 218   memcached_return_t rc;
 219   if (memcached_failed(rc= initialize_query(ptr, true)))
 220   {
 221     return rc;
 222   }
 223
 224   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 225   {
 226     return rc;
 227   }
 228
 229
 230   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 231   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 232
 233   bool reply= memcached_is_replying(instance->root);
 234
 235   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 236   if (memcached_is_binary(ptr))
 237   {
 238     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_DECREMENT,
 239                          key, key_length,
 240                          offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 241                          reply);
 242   }
 243   else
 244   {
 245     rc= text_incr_decr(instance, false, key, key_length, offset, reply);
 246   }
 247
 248   auto_response(instance, reply, rc, value);
 249
 250   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 251
 252   return rc;
 253 }
 254
 255 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 256                                                     const char *key,
 257                                                     size_t key_length,
 258                                                     uint64_t offset,
 259                                                     uint64_t initial,
 260                                                     time_t expiration,
 261                                                     uint64_t *value)
 262 {
 263   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 264                                                  key, key_length,
 265                                                  offset, initial, expiration, value);
 266 }
 267
 268 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 269                                                          const char *group_key,
 270                                                          size_t group_key_length,
 271                                                          const char *key,
 272                                                          size_t key_length,
 273                                                          uint64_t offset,
 274                                                          uint64_t initial,
 275                                                          time_t expiration,
 276                                                          uint64_t *value)
 277 {
 278   uint64_t local_value;
 279   if (value == NULL)
 280   {
 281     value= &local_value;
 282   }
 283
 284   memcached_return_t rc;
 285   if (memcached_failed(rc= initialize_query(ptr, true)))
 286   {
 287     return rc;
 288   }
 289
 290   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 291   {
 292     return rc;
 293   }
 294
 295   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 296   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 297
 298   bool reply= memcached_is_replying(instance->root);
 299
 300   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 301   if (memcached_is_binary(ptr))
 302   {
 303     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_INCREMENT,
 304                          key, key_length,
 305                          offset, initial, uint32_t(expiration),
 306                          reply);
 307
 308   }
 309   else
 310   {
 311     rc=  memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 312                              memcached_literal_param("memcached_increment_with_initial_by_key() is not supported via the ASCII protocol"));
 313   }
 314
 315   auto_response(instance, reply, rc, value);
 316
 317   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 318
 319   return rc;
 320 }
 321
 322 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 323                                                     const char *key,
 324                                                     size_t key_length,
 325                                                     uint64_t offset,
 326                                                     uint64_t initial,
 327                                                     time_t expiration,
 328                                                     uint64_t *value)
 329 {
 330   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 331                                                  key, key_length,
 332                                                  offset, initial, expiration, value);
 333 }
 334
 335 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 336                                                            const char *group_key,
 337                                                            size_t group_key_length,
 338                                                            const char *key,
 339                                                            size_t key_length,
 340                                                            uint64_t offset,
 341                                                            uint64_t initial,
 342                                                            time_t expiration,
 343                                                            uint64_t *value)
 344 {
 345   uint64_t local_value;
 346   if (value == NULL)
 347   {
 348     value= &local_value;
 349   }
 350
 351   memcached_return_t rc;
 352   if (memcached_failed(rc= initialize_query(ptr, true)))
 353   {
 354     return rc;
 355   }
 356
 357   if (memcached_failed(rc= memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
 358   {
 359     return rc;
 360   }
 361
 362   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 363   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 364
 365   bool reply= memcached_is_replying(instance->root);
 366
 367
 368   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 369   if (memcached_is_binary(ptr))
 370   {
 371     rc= binary_incr_decr(instance, PROTOCOL_BINARY_CMD_DECREMENT,
 372                          key, key_length,
 373                          offset, initial, uint32_t(expiration),
 374                          reply);
 375
 376   }
 377   else
 378   {
 379     rc=  memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 380                              memcached_literal_param("memcached_decrement_with_initial_by_key() is not supported via the ASCII protocol"));
 381   }
 382
 383   auto_response(instance, reply, rc, value);
 384
 385   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 386
 387   return rc;
 388 }