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