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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,
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  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  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(org::libmemcached::Instance* 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(org::libmemcached::Instance* 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, size_t(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(org::libmemcached::Instance* 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   initialize_binary_request(instance, request.message.header);
 122
 123   request.message.header.request.opcode= cmd;
 124   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(instance->root->_namespace)));
 125   request.message.header.request.extlen= 20;
 126   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 127   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(instance->root->_namespace) +request.message.header.request.extlen));
 128   request.message.body.delta= memcached_htonll(offset);
 129   request.message.body.initial= memcached_htonll(initial);
 130   request.message.body.expiration= htonl((uint32_t) expiration);
 131
 132   libmemcached_io_vector_st vector[]=
 133   {
 134     { NULL, 0 },
 135     { request.bytes, sizeof(request.bytes) },
 136     { memcached_array_string(instance->root->_namespace), memcached_array_size(instance->root->_namespace) },
 137     { key, key_length }
 138   };
 139
 140   return memcached_vdo(instance, vector, 4, true);
 141 }
 142
 143 memcached_return_t memcached_increment(memcached_st *memc,
 144                                        const char *key, size_t key_length,
 145                                        uint32_t offset,
 146                                        uint64_t *value)
 147 {
 148   return memcached_increment_by_key(memc, key, key_length, key, key_length, offset, value);
 149 }
 150
 151 static memcached_return_t increment_decrement_by_key(const protocol_binary_command command,
 152                                                      memcached_st *memc,
 153                                                      const char *group_key, size_t group_key_length,
 154                                                      const char *key, size_t key_length,
 155                                                      uint64_t offset,
 156                                                      uint64_t *value)
 157 {
 158   uint64_t local_value;
 159   if (value == NULL)
 160   {
 161     value= &local_value;
 162   }
 163
 164   memcached_return_t rc;
 165   if (memcached_failed(rc= initialize_query(memc, true)))
 166   {
 167     return rc;
 168   }
 169
 170   if (memcached_is_encrypted(memc))
 171   {
 172     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 173                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 174   }
 175
 176   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 177   {
 178     return memcached_last_error(memc);
 179   }
 180
 181   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 182   org::libmemcached::Instance* instance= memcached_instance_fetch(memc, server_key);
 183
 184   bool reply= memcached_is_replying(instance->root);
 185
 186   if (memcached_is_binary(memc))
 187   {
 188     rc= binary_incr_decr(instance, command,
 189                          key, key_length,
 190                          uint64_t(offset), 0, MEMCACHED_EXPIRATION_NOT_ADD,
 191                          reply);
 192   }
 193   else
 194   {
 195     rc= text_incr_decr(instance,
 196                        command == PROTOCOL_BINARY_CMD_INCREMENT ? true : false,
 197                        key, key_length,
 198                        offset, reply);
 199   }
 200
 201   auto_response(instance, reply, rc, value);
 202
 203   return rc;
 204 }
 205
 206 static memcached_return_t increment_decrement_with_initial_by_key(const protocol_binary_command command,
 207                                                                   memcached_st *memc,
 208                                                                   const char *group_key,
 209                                                                   size_t group_key_length,
 210                                                                   const char *key,
 211                                                                   size_t key_length,
 212                                                                   uint64_t offset,
 213                                                                   uint64_t initial,
 214                                                                   time_t expiration,
 215                                                                   uint64_t *value)
 216 {
 217   uint64_t local_value;
 218   if (value == NULL)
 219   {
 220     value= &local_value;
 221   }
 222
 223   memcached_return_t rc;
 224   if (memcached_failed(rc= initialize_query(memc, true)))
 225   {
 226     return rc;
 227   }
 228
 229   if (memcached_is_encrypted(memc))
 230   {
 231     return memcached_set_error(*memc, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
 232                                memcached_literal_param("Operation not allowed while encyrption is enabled"));
 233   }
 234
 235   if (memcached_failed(rc= memcached_key_test(*memc, (const char **)&key, &key_length, 1)))
 236   {
 237     return memcached_last_error(memc);
 238   }
 239
 240   uint32_t server_key= memcached_generate_hash_with_redistribution(memc, group_key, group_key_length);
 241   org::libmemcached::Instance* instance= memcached_instance_fetch(memc, server_key);
 242
 243   bool reply= memcached_is_replying(instance->root);
 244
 245   if (memcached_is_binary(memc))
 246   {
 247     rc= binary_incr_decr(instance, command,
 248                          key, key_length,
 249                          offset, initial, uint32_t(expiration),
 250                          reply);
 251
 252   }
 253   else
 254   {
 255     rc=  memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 256                              memcached_literal_param("memcached_increment_with_initial_by_key() is not supported via the ASCII protocol"));
 257   }
 258
 259   auto_response(instance, reply, rc, value);
 260
 261   return rc;
 262 }
 263
 264 memcached_return_t memcached_decrement(memcached_st *memc,
 265                                        const char *key, size_t key_length,
 266                                        uint32_t offset,
 267                                        uint64_t *value)
 268 {
 269   return memcached_decrement_by_key(memc, key, key_length, key, key_length, offset, value);
 270 }
 271
 272
 273 memcached_return_t memcached_increment_by_key(memcached_st *memc,
 274                                               const char *group_key, size_t group_key_length,
 275                                               const char *key, size_t key_length,
 276                                               uint64_t offset,
 277                                               uint64_t *value)
 278 {
 279   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 280   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 281                                                     memc,
 282                                                     group_key, group_key_length,
 283                                                     key, key_length,
 284                                                     offset, value);
 285
 286   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 287
 288   return rc;
 289 }
 290
 291 memcached_return_t memcached_decrement_by_key(memcached_st *memc,
 292                                               const char *group_key, size_t group_key_length,
 293                                               const char *key, size_t key_length,
 294                                               uint64_t offset,
 295                                               uint64_t *value)
 296 {
 297   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 298   memcached_return_t rc= increment_decrement_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 299                                                     memc,
 300                                                     group_key, group_key_length,
 301                                                     key, key_length,
 302                                                     offset, value);
 303   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 304
 305   return rc;
 306 }
 307
 308 memcached_return_t memcached_increment_with_initial(memcached_st *memc,
 309                                                     const char *key,
 310                                                     size_t key_length,
 311                                                     uint64_t offset,
 312                                                     uint64_t initial,
 313                                                     time_t expiration,
 314                                                     uint64_t *value)
 315 {
 316   return memcached_increment_with_initial_by_key(memc, key, key_length,
 317                                                  key, key_length,
 318                                                  offset, initial, expiration, value);
 319 }
 320
 321 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *memc,
 322                                                            const char *group_key,
 323                                                            size_t group_key_length,
 324                                                            const char *key,
 325                                                            size_t key_length,
 326                                                            uint64_t offset,
 327                                                            uint64_t initial,
 328                                                            time_t expiration,
 329                                                            uint64_t *value)
 330 {
 331   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 332   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_INCREMENT,
 333                                                                  memc,
 334                                                                  group_key, group_key_length,
 335                                                                  key, key_length,
 336                                                                  offset, initial, expiration, value);
 337   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 338
 339   return rc;
 340 }
 341
 342 memcached_return_t memcached_decrement_with_initial(memcached_st *memc,
 343                                                     const char *key,
 344                                                     size_t key_length,
 345                                                     uint64_t offset,
 346                                                     uint64_t initial,
 347                                                     time_t expiration,
 348                                                     uint64_t *value)
 349 {
 350   return memcached_decrement_with_initial_by_key(memc, key, key_length,
 351                                                  key, key_length,
 352                                                  offset, initial, expiration, value);
 353 }
 354
 355 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *memc,
 356                                                            const char *group_key,
 357                                                            size_t group_key_length,
 358                                                            const char *key,
 359                                                            size_t key_length,
 360                                                            uint64_t offset,
 361                                                            uint64_t initial,
 362                                                            time_t expiration,
 363                                                            uint64_t *value)
 364 {
 365   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 366   memcached_return_t rc= increment_decrement_with_initial_by_key(PROTOCOL_BINARY_CMD_DECREMENT,
 367                                                                  memc,
 368                                                                  group_key, group_key_length,
 369                                                                  key, key_length,
 370                                                                  offset, initial, expiration, value);
 371
 372   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 373
 374   return rc;
 375 }