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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     { request.bytes, sizeof(request.bytes) },
 149     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
 150     { key, key_length }
 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   {
 162     return MEMCACHED_SUCCESS;
 163   }
 164
 165   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 166 }
 167
 168 memcached_return_t memcached_increment(memcached_st *ptr,
 169                                        const char *key, size_t key_length,
 170                                        uint32_t offset,
 171                                        uint64_t *value)
 172 {
 173   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 174 }
 175
 176 memcached_return_t memcached_decrement(memcached_st *ptr,
 177                                        const char *key, size_t key_length,
 178                                        uint32_t offset,
 179                                        uint64_t *value)
 180 {
 181   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 182 }
 183
 184 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 185                                               const char *group_key, size_t group_key_length,
 186                                               const char *key, size_t key_length,
 187                                               uint64_t offset,
 188                                               uint64_t *value)
 189 {
 190   memcached_return_t rc;
 191   uint64_t local_value;
 192   if (value == NULL)
 193   {
 194     value= &local_value;
 195   }
 196
 197   if (memcached_failed(rc= initialize_query(ptr)))
 198   {
 199     return rc;
 200   }
 201
 202   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 203   {
 204     return rc;
 205   }
 206
 207   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 208   if (ptr->flags.binary_protocol)
 209   {
 210     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 211                          group_key, group_key_length, key, key_length,
 212                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 213                          value);
 214   }
 215   else
 216   {
 217      rc= text_incr_decr(ptr, "incr", group_key, group_key_length, key, key_length, offset, value);
 218   }
 219
 220   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 221
 222   return rc;
 223 }
 224
 225 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 226                                               const char *group_key, size_t group_key_length,
 227                                               const char *key, size_t key_length,
 228                                               uint64_t offset,
 229                                               uint64_t *value)
 230 {
 231   uint64_t local_value;
 232   if (value == NULL)
 233   {
 234     value= &local_value;
 235   }
 236
 237   memcached_return_t rc;
 238   if (memcached_failed(rc= initialize_query(ptr)))
 239   {
 240     return rc;
 241   }
 242
 243   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 244   {
 245     return rc;
 246   }
 247
 248
 249   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 250   if (ptr->flags.binary_protocol)
 251   {
 252     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 253                          group_key, group_key_length, key, key_length,
 254                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 255                          value);
 256   }
 257   else
 258   {
 259     rc= text_incr_decr(ptr, "decr", group_key, group_key_length, key, key_length, offset, value);
 260   }
 261
 262   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 263
 264   return rc;
 265 }
 266
 267 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 268                                                     const char *key,
 269                                                     size_t key_length,
 270                                                     uint64_t offset,
 271                                                     uint64_t initial,
 272                                                     time_t expiration,
 273                                                     uint64_t *value)
 274 {
 275   uint64_t local_value;
 276   if (value == NULL)
 277   {
 278     value= &local_value;
 279   }
 280
 281   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 282                                                  key, key_length,
 283                                                  offset, initial, expiration, value);
 284 }
 285
 286 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 287                                                          const char *group_key,
 288                                                          size_t group_key_length,
 289                                                          const char *key,
 290                                                          size_t key_length,
 291                                                          uint64_t offset,
 292                                                          uint64_t initial,
 293                                                          time_t expiration,
 294                                                          uint64_t *value)
 295 {
 296   uint64_t local_value;
 297   if (value == NULL)
 298   {
 299     value= &local_value;
 300   }
 301
 302   memcached_return_t rc;
 303   if (memcached_failed(rc= initialize_query(ptr)))
 304   {
 305     return rc;
 306   }
 307
 308   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 309   {
 310     return rc;
 311   }
 312
 313   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 314   if (ptr->flags.binary_protocol)
 315   {
 316     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 317                          group_key, group_key_length, key, key_length,
 318                          offset, initial, (uint32_t)expiration,
 319                          value);
 320   }
 321   else
 322   {
 323     rc= MEMCACHED_PROTOCOL_ERROR;
 324   }
 325
 326   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 327
 328   return rc;
 329 }
 330
 331 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 332                                                     const char *key,
 333                                                     size_t key_length,
 334                                                     uint64_t offset,
 335                                                     uint64_t initial,
 336                                                     time_t expiration,
 337                                                     uint64_t *value)
 338 {
 339   uint64_t local_value;
 340   if (value == NULL)
 341   {
 342     value= &local_value;
 343   }
 344
 345   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 346                                                  key, key_length,
 347                                                  offset, initial, expiration, value);
 348 }
 349
 350 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 351                                                            const char *group_key,
 352                                                            size_t group_key_length,
 353                                                            const char *key,
 354                                                            size_t key_length,
 355                                                            uint64_t offset,
 356                                                            uint64_t initial,
 357                                                            time_t expiration,
 358                                                            uint64_t *value)
 359 {
 360   uint64_t local_value;
 361   if (value == NULL)
 362   {
 363     value= &local_value;
 364   }
 365
 366   memcached_return_t rc;
 367   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 368   {
 369     return rc;
 370   }
 371
 372   if (memcached_failed(rc= initialize_query(ptr)))
 373   {
 374     return rc;
 375   }
 376
 377
 378   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 379   if (ptr->flags.binary_protocol)
 380   {
 381     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 382                          group_key, group_key_length, key, key_length,
 383                          offset, initial, (uint32_t)expiration,
 384                          value);
 385   }
 386   else
 387   {
 388     rc= MEMCACHED_PROTOCOL_ERROR;
 389   }
 390
 391   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 392
 393   return rc;
 394 }
 395