git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/auto.cc

   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 bool is_incr,
  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& numeric_value)
  46 {
  47   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  48   uint32_t server_key;
  49   memcached_server_write_instance_st instance;
  50
  51   // Invert the logic to make it simpler to read the code
  52   bool reply= (ptr->flags.no_reply) ? false : true;
  53
  54   if (memcached_failed(memcached_key_test(*ptr, (const char **)&key, &key_length, 1)))
  55   {
  56     return memcached_set_error(*ptr, MEMCACHED_BAD_KEY_PROVIDED, MEMCACHED_AT);
  57   }
  58
  59   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
  60   instance= memcached_server_instance_fetch(ptr, server_key);
  61
  62   int send_length= snprintf(buffer, sizeof(buffer), " %" PRIu64, offset);
  63   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  64   {
  65     return memcached_set_error(*ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  66                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  67   }
  68
  69   struct libmemcached_io_vector_st vector[]=
  70   {
  71     { memcached_literal_param("incr ") },
  72     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
  73     { key, key_length },
  74     { buffer, send_length },
  75     { " noreply", reply ? 0 : memcached_literal_param_size(" noreply") },
  76     { memcached_literal_param("\r\n") }
  77   };
  78
  79   if (is_incr == false)
  80   {
  81     vector[0].buffer= "decr ";
  82   }
  83
  84   memcached_return_t rc= memcached_vdo(instance, vector, 6, true);
  85   if (reply == false or memcached_failed(rc))
  86   {
  87     numeric_value= UINT64_MAX;
  88     return rc;
  89   }
  90
  91   rc= memcached_response(instance, buffer, sizeof(buffer), NULL, numeric_value);
  92
  93   return memcached_set_error(*instance, rc, MEMCACHED_AT);
  94 }
  95
  96 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
  97                                            const char *group_key, size_t group_key_length,
  98                                            const char *key, size_t key_length,
  99                                            uint64_t offset, uint64_t initial,
 100                                            uint32_t expiration,
 101                                            uint64_t *value)
 102 {
 103   bool no_reply= ptr->flags.no_reply;
 104
 105   uint32_t server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 106   memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, server_key);
 107
 108   if (no_reply)
 109   {
 110     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 111       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 112
 113     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 114       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 115   }
 116   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 117
 118   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 119   request.message.header.request.opcode= cmd;
 120   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(ptr->_namespace)));
 121   request.message.header.request.extlen= 20;
 122   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 123   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(ptr->_namespace) +request.message.header.request.extlen));
 124   request.message.body.delta= memcached_htonll(offset);
 125   request.message.body.initial= memcached_htonll(initial);
 126   request.message.body.expiration= htonl((uint32_t) expiration);
 127
 128   struct libmemcached_io_vector_st vector[]=
 129   {
 130     { request.bytes, sizeof(request.bytes) },
 131     { memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace) },
 132     { key, key_length }
 133   };
 134
 135   memcached_return_t rc;
 136   if (memcached_failed(rc= memcached_vdo(instance, vector, 3, true)))
 137   {
 138     memcached_io_reset(instance);
 139     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 140   }
 141
 142   if (no_reply)
 143   {
 144     return MEMCACHED_SUCCESS;
 145   }
 146
 147   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 148 }
 149
 150 memcached_return_t memcached_increment(memcached_st *ptr,
 151                                        const char *key, size_t key_length,
 152                                        uint32_t offset,
 153                                        uint64_t *value)
 154 {
 155   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 156 }
 157
 158 memcached_return_t memcached_decrement(memcached_st *ptr,
 159                                        const char *key, size_t key_length,
 160                                        uint32_t offset,
 161                                        uint64_t *value)
 162 {
 163   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 164 }
 165
 166 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 167                                               const char *group_key, size_t group_key_length,
 168                                               const char *key, size_t key_length,
 169                                               uint64_t offset,
 170                                               uint64_t *value)
 171 {
 172   memcached_return_t rc;
 173   uint64_t local_value;
 174   if (value == NULL)
 175   {
 176     value= &local_value;
 177   }
 178
 179   if (memcached_failed(rc= initialize_query(ptr)))
 180   {
 181     return rc;
 182   }
 183
 184   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 185   {
 186     return rc;
 187   }
 188
 189   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 190   if (ptr->flags.binary_protocol)
 191   {
 192     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 193                          group_key, group_key_length, key, key_length,
 194                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 195                          value);
 196   }
 197   else
 198   {
 199      rc= text_incr_decr(ptr, true, group_key, group_key_length, key, key_length, offset, *value);
 200   }
 201
 202   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 203
 204   return rc;
 205 }
 206
 207 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 208                                               const char *group_key, size_t group_key_length,
 209                                               const char *key, size_t key_length,
 210                                               uint64_t offset,
 211                                               uint64_t *value)
 212 {
 213   uint64_t local_value;
 214   if (value == NULL)
 215   {
 216     value= &local_value;
 217   }
 218
 219   memcached_return_t rc;
 220   if (memcached_failed(rc= initialize_query(ptr)))
 221   {
 222     return rc;
 223   }
 224
 225   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 226   {
 227     return rc;
 228   }
 229
 230
 231   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 232   if (ptr->flags.binary_protocol)
 233   {
 234     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 235                          group_key, group_key_length, key, key_length,
 236                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 237                          value);
 238   }
 239   else
 240   {
 241     rc= text_incr_decr(ptr, false, group_key, group_key_length, key, key_length, offset, *value);
 242   }
 243
 244   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 245
 246   return rc;
 247 }
 248
 249 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 250                                                     const char *key,
 251                                                     size_t key_length,
 252                                                     uint64_t offset,
 253                                                     uint64_t initial,
 254                                                     time_t expiration,
 255                                                     uint64_t *value)
 256 {
 257   uint64_t local_value;
 258   if (value == NULL)
 259   {
 260     value= &local_value;
 261   }
 262
 263   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 264                                                  key, key_length,
 265                                                  offset, initial, expiration, value);
 266 }
 267
 268 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 269                                                          const char *group_key,
 270                                                          size_t group_key_length,
 271                                                          const char *key,
 272                                                          size_t key_length,
 273                                                          uint64_t offset,
 274                                                          uint64_t initial,
 275                                                          time_t expiration,
 276                                                          uint64_t *value)
 277 {
 278   uint64_t local_value;
 279   if (value == NULL)
 280   {
 281     value= &local_value;
 282   }
 283
 284   memcached_return_t rc;
 285   if (memcached_failed(rc= initialize_query(ptr)))
 286   {
 287     return rc;
 288   }
 289
 290   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 291   {
 292     return rc;
 293   }
 294
 295   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 296   if (ptr->flags.binary_protocol)
 297   {
 298     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 299                          group_key, group_key_length, key, key_length,
 300                          offset, initial, (uint32_t)expiration,
 301                          value);
 302   }
 303   else
 304   {
 305     rc= MEMCACHED_PROTOCOL_ERROR;
 306   }
 307
 308   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 309
 310   return rc;
 311 }
 312
 313 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 314                                                     const char *key,
 315                                                     size_t key_length,
 316                                                     uint64_t offset,
 317                                                     uint64_t initial,
 318                                                     time_t expiration,
 319                                                     uint64_t *value)
 320 {
 321   uint64_t local_value;
 322   if (value == NULL)
 323   {
 324     value= &local_value;
 325   }
 326
 327   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 328                                                  key, key_length,
 329                                                  offset, initial, expiration, value);
 330 }
 331
 332 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 333                                                            const char *group_key,
 334                                                            size_t group_key_length,
 335                                                            const char *key,
 336                                                            size_t key_length,
 337                                                            uint64_t offset,
 338                                                            uint64_t initial,
 339                                                            time_t expiration,
 340                                                            uint64_t *value)
 341 {
 342   uint64_t local_value;
 343   if (value == NULL)
 344   {
 345     value= &local_value;
 346   }
 347
 348   memcached_return_t rc;
 349   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 350   {
 351     return rc;
 352   }
 353
 354   if (memcached_failed(rc= initialize_query(ptr)))
 355   {
 356     return rc;
 357   }
 358
 359
 360   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 361   if (ptr->flags.binary_protocol)
 362   {
 363     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 364                          group_key, group_key_length, key, key_length,
 365                          offset, initial, (uint32_t)expiration,
 366                          value);
 367   }
 368   else
 369   {
 370     rc= MEMCACHED_PROTOCOL_ERROR;
 371   }
 372
 373   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 374
 375   return rc;
 376 }
 377