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