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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_st *ptr,
  41                                          const bool is_incr,
  42                                          const char *group_key, size_t group_key_length,
  43                                          const char *key, size_t key_length,
  44                                          uint64_t offset,
  45                                          uint64_t *value)
  46 {
  47   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  48   uint32_t server_key;
  49   memcached_server_write_instance_st instance;
  50
  51   // Invert the logic to make it simpler to read the code
  52   bool reply= (ptr->flags.no_reply) ? false : true;
  53
  54   if (memcached_failed(memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
  55   {
  56     return memcached_set_error(*ptr, MEMCACHED_BAD_KEY_PROVIDED, MEMCACHED_AT);
  57   }
  58
  59   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
  60   instance= memcached_server_instance_fetch(ptr, server_key);
  61
  62   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  63   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  64   {
  65     return memcached_set_error(*ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  66                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  67   }
  68
  69   struct libmemcached_io_vector_st vector[]=
  70   {
  71     { memcached_literal_param("incr ") },
  72     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
  73     { key, key_length },
  74     { buffer, send_length },
  75     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  76     { memcached_literal_param("\r\n") }
  77   };
  78
  79   if (is_incr == false)
  80   {
  81     vector[0].buffer= "decr ";
  82   }
  83
  84   memcached_return_t rc= memcached_vdo(instance, vector, 6, true);
  85   if (reply == false or memcached_failed(rc))
  86   {
  87     return rc;
  88   }
  89
  90   rc= memcached_response(instance, buffer, sizeof(buffer), NULL);
  91
  92   if (rc != MEMCACHED_SUCCESS)
  93   {
  94     return memcached_set_error(*instance, rc, MEMCACHED_AT);
  95   }
  96
  97   /*
  98     So why recheck responce? Because the protocol is brain dead :)
  99     The number returned might end up equaling one of the string
 100     values. Less chance of a mistake with strncmp() so we will
 101     use it. We still called memcached_response() though since it
 102     worked its magic for non-blocking IO.
 103   */
 104   if (not strncmp(buffer, memcached_literal_param("ERROR\r\n")))
 105   {
 106     *value= 0;
 107     rc= MEMCACHED_PROTOCOL_ERROR;
 108   }
 109   else if (not strncmp(buffer, memcached_literal_param("CLIENT_ERROR\r\n")))
 110   {
 111     *value= 0;
 112     rc= MEMCACHED_PROTOCOL_ERROR;
 113   }
 114   else if (not strncmp(buffer, memcached_literal_param("NOT_FOUND\r\n")))
 115   {
 116     *value= 0;
 117     rc= MEMCACHED_NOTFOUND;
 118   }
 119   else
 120   {
 121     *value= strtoull(buffer, (char **)NULL, 10);
 122     rc= MEMCACHED_SUCCESS;
 123   }
 124
 125   return memcached_set_error(*instance, rc, MEMCACHED_AT);
 126 }
 127
 128 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
 129                                            const char *group_key, size_t group_key_length,
 130                                            const char *key, size_t key_length,
 131                                            uint64_t offset, uint64_t initial,
 132                                            uint32_t expiration,
 133                                            uint64_t *value)
 134 {
 135   bool no_reply= ptr->flags.no_reply;
 136
 137   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 138   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 139
 140   if (no_reply)
 141   {
 142     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 143       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 144
 145     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 146       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 147   }
 148   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 149
 150   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 151   request.message.header.request.opcode= cmd;
 152   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(ptr->_namespace)));
 153   request.message.header.request.extlen= 20;
 154   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 155   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(ptr->_namespace) +request.message.header.request.extlen));
 156   request.message.body.delta= memcached_htonll(offset);
 157   request.message.body.initial= memcached_htonll(initial);
 158   request.message.body.expiration= htonl((uint32_t) expiration);
 159
 160   struct libmemcached_io_vector_st vector[]=
 161   {
 162     { request.bytes, sizeof(request.bytes) },
 163     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
 164     { key, key_length }
 165   };
 166
 167   memcached_return_t rc;
 168   if (memcached_failed(rc= memcached_vdo(instance, vector, 3, true)))
 169   {
 170     memcached_io_reset(instance);
 171     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 172   }
 173
 174   if (no_reply)
 175   {
 176     return MEMCACHED_SUCCESS;
 177   }
 178
 179   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 180 }
 181
 182 memcached_return_t memcached_increment(memcached_st *ptr,
 183                                        const char *key, size_t key_length,
 184                                        uint32_t offset,
 185                                        uint64_t *value)
 186 {
 187   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 188 }
 189
 190 memcached_return_t memcached_decrement(memcached_st *ptr,
 191                                        const char *key, size_t key_length,
 192                                        uint32_t offset,
 193                                        uint64_t *value)
 194 {
 195   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 196 }
 197
 198 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 199                                               const char *group_key, size_t group_key_length,
 200                                               const char *key, size_t key_length,
 201                                               uint64_t offset,
 202                                               uint64_t *value)
 203 {
 204   memcached_return_t rc;
 205   uint64_t local_value;
 206   if (value == NULL)
 207   {
 208     value= &local_value;
 209   }
 210
 211   if (memcached_failed(rc= initialize_query(ptr)))
 212   {
 213     return rc;
 214   }
 215
 216   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 217   {
 218     return rc;
 219   }
 220
 221   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 222   if (ptr->flags.binary_protocol)
 223   {
 224     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 225                          group_key, group_key_length, key, key_length,
 226                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 227                          value);
 228   }
 229   else
 230   {
 231      rc= text_incr_decr(ptr, true, group_key, group_key_length, key, key_length, offset, value);
 232   }
 233
 234   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 235
 236   return rc;
 237 }
 238
 239 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 240                                               const char *group_key, size_t group_key_length,
 241                                               const char *key, size_t key_length,
 242                                               uint64_t offset,
 243                                               uint64_t *value)
 244 {
 245   uint64_t local_value;
 246   if (value == NULL)
 247   {
 248     value= &local_value;
 249   }
 250
 251   memcached_return_t rc;
 252   if (memcached_failed(rc= initialize_query(ptr)))
 253   {
 254     return rc;
 255   }
 256
 257   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 258   {
 259     return rc;
 260   }
 261
 262
 263   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 264   if (ptr->flags.binary_protocol)
 265   {
 266     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 267                          group_key, group_key_length, key, key_length,
 268                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 269                          value);
 270   }
 271   else
 272   {
 273     rc= text_incr_decr(ptr, false, group_key, group_key_length, key, key_length, offset, value);
 274   }
 275
 276   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 277
 278   return rc;
 279 }
 280
 281 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 282                                                     const char *key,
 283                                                     size_t key_length,
 284                                                     uint64_t offset,
 285                                                     uint64_t initial,
 286                                                     time_t expiration,
 287                                                     uint64_t *value)
 288 {
 289   uint64_t local_value;
 290   if (value == NULL)
 291   {
 292     value= &local_value;
 293   }
 294
 295   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 296                                                  key, key_length,
 297                                                  offset, initial, expiration, value);
 298 }
 299
 300 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 301                                                          const char *group_key,
 302                                                          size_t group_key_length,
 303                                                          const char *key,
 304                                                          size_t key_length,
 305                                                          uint64_t offset,
 306                                                          uint64_t initial,
 307                                                          time_t expiration,
 308                                                          uint64_t *value)
 309 {
 310   uint64_t local_value;
 311   if (value == NULL)
 312   {
 313     value= &local_value;
 314   }
 315
 316   memcached_return_t rc;
 317   if (memcached_failed(rc= initialize_query(ptr)))
 318   {
 319     return rc;
 320   }
 321
 322   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 323   {
 324     return rc;
 325   }
 326
 327   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 328   if (ptr->flags.binary_protocol)
 329   {
 330     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 331                          group_key, group_key_length, key, key_length,
 332                          offset, initial, (uint32_t)expiration,
 333                          value);
 334   }
 335   else
 336   {
 337     rc= MEMCACHED_PROTOCOL_ERROR;
 338   }
 339
 340   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 341
 342   return rc;
 343 }
 344
 345 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 346                                                     const char *key,
 347                                                     size_t key_length,
 348                                                     uint64_t offset,
 349                                                     uint64_t initial,
 350                                                     time_t expiration,
 351                                                     uint64_t *value)
 352 {
 353   uint64_t local_value;
 354   if (value == NULL)
 355   {
 356     value= &local_value;
 357   }
 358
 359   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 360                                                  key, key_length,
 361                                                  offset, initial, expiration, value);
 362 }
 363
 364 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 365                                                            const char *group_key,
 366                                                            size_t group_key_length,
 367                                                            const char *key,
 368                                                            size_t key_length,
 369                                                            uint64_t offset,
 370                                                            uint64_t initial,
 371                                                            time_t expiration,
 372                                                            uint64_t *value)
 373 {
 374   uint64_t local_value;
 375   if (value == NULL)
 376   {
 377     value= &local_value;
 378   }
 379
 380   memcached_return_t rc;
 381   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 382   {
 383     return rc;
 384   }
 385
 386   if (memcached_failed(rc= initialize_query(ptr)))
 387   {
 388     return rc;
 389   }
 390
 391
 392   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 393   if (ptr->flags.binary_protocol)
 394   {
 395     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 396                          group_key, group_key_length, key, key_length,
 397                          offset, initial, (uint32_t)expiration,
 398                          value);
 399   }
 400   else
 401   {
 402     rc= MEMCACHED_PROTOCOL_ERROR;
 403   }
 404
 405   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 406
 407   return rc;
 408 }
 409