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