git.m6w6.name Git - m6w6/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 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 (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  53     return memcached_set_error(ptr, MEMCACHED_BAD_KEY_PROVIDED);
  54
  55   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
  56   instance= memcached_server_instance_fetch(ptr, server_key);
  57
  58   int send_length;
  59   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  60                         "%s %.*s%.*s %" PRIu64 "%s\r\n", verb,
  61                         memcached_print_array(ptr->prefix_key),
  62                         (int)key_length, key,
  63                         offset, no_reply ? " noreply" : "");
  64   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  65     return memcached_set_error_string(ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  66
  67   memcached_return_t rc= memcached_do(instance, buffer, (size_t)send_length, true);
  68   if (no_reply or memcached_failed(rc))
  69     return rc;
  70
  71   rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  72
  73   /*
  74     So why recheck responce? Because the protocol is brain dead :)
  75     The number returned might end up equaling one of the string
  76     values. Less chance of a mistake with strncmp() so we will
  77     use it. We still called memcached_response() though since it
  78     worked its magic for non-blocking IO.
  79   */
  80   if (not strncmp(buffer, memcached_literal_param("ERROR\r\n")))
  81   {
  82     *value= 0;
  83     rc= MEMCACHED_PROTOCOL_ERROR;
  84   }
  85   else if (not strncmp(buffer, memcached_literal_param("CLIENT_ERROR\r\n")))
  86   {
  87     *value= 0;
  88     rc= MEMCACHED_PROTOCOL_ERROR;
  89   }
  90   else if (not strncmp(buffer, memcached_literal_param("NOT_FOUND\r\n")))
  91   {
  92     *value= 0;
  93     rc= MEMCACHED_NOTFOUND;
  94   }
  95   else
  96   {
  97     *value= strtoull(buffer, (char **)NULL, 10);
  98     rc= MEMCACHED_SUCCESS;
  99   }
 100
 101   return memcached_set_error(*instance, rc);
 102 }
 103
 104 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
 105                                            const char *group_key, size_t group_key_length,
 106                                            const char *key, size_t key_length,
 107                                            uint64_t offset, uint64_t initial,
 108                                            uint32_t expiration,
 109                                            uint64_t *value)
 110 {
 111   uint32_t server_key;
 112   memcached_server_write_instance_st instance;
 113   bool no_reply= ptr->flags.no_reply;
 114
 115   if (memcached_server_count(ptr) == 0)
 116     return memcached_set_error(ptr, MEMCACHED_NO_SERVERS);
 117
 118   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 119   instance= memcached_server_instance_fetch(ptr, server_key);
 120
 121   if (no_reply)
 122   {
 123     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 124       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 125     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 126       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 127   }
 128   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 129
 130   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 131   request.message.header.request.opcode= cmd;
 132   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(ptr->prefix_key)));
 133   request.message.header.request.extlen= 20;
 134   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 135   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(ptr->prefix_key) +request.message.header.request.extlen));
 136   request.message.body.delta= htonll(offset);
 137   request.message.body.initial= htonll(initial);
 138   request.message.body.expiration= htonl((uint32_t) expiration);
 139
 140   struct libmemcached_io_vector_st vector[]=
 141   {
 142     { sizeof(request.bytes), request.bytes },
 143     { memcached_array_size(ptr->prefix_key), ptr->prefix_key },
 144     { key_length, key }
 145   };
 146
 147   memcached_return_t rc;
 148   if ((rc= memcached_vdo(instance, vector, 3, true)) != MEMCACHED_SUCCESS)
 149   {
 150     memcached_io_reset(instance);
 151     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 152   }
 153
 154   if (no_reply)
 155     return MEMCACHED_SUCCESS;
 156
 157   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 158 }
 159
 160 memcached_return_t memcached_increment(memcached_st *ptr,
 161                                        const char *key, size_t key_length,
 162                                        uint32_t offset,
 163                                        uint64_t *value)
 164 {
 165   uint64_t local_value;
 166   if (! value)
 167     value= &local_value;
 168
 169   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 170 }
 171
 172 memcached_return_t memcached_decrement(memcached_st *ptr,
 173                                        const char *key, size_t key_length,
 174                                        uint32_t offset,
 175                                        uint64_t *value)
 176 {
 177   uint64_t local_value;
 178   if (! value)
 179     value= &local_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 (not value)
 193     value= &local_value;
 194
 195   if (memcached_failed(rc= initialize_query(ptr)))
 196   {
 197     return rc;
 198   }
 199
 200   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 201   {
 202     return rc;
 203   }
 204
 205   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 206   if (ptr->flags.binary_protocol)
 207   {
 208     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 209                          group_key, group_key_length, key, key_length,
 210                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 211                          value);
 212   }
 213   else
 214   {
 215      rc= text_incr_decr(ptr, "incr", group_key, group_key_length, key, key_length, offset, value);
 216   }
 217
 218   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 219
 220   return rc;
 221 }
 222
 223 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 224                                               const char *group_key, size_t group_key_length,
 225                                               const char *key, size_t key_length,
 226                                               uint64_t offset,
 227                                               uint64_t *value)
 228 {
 229   uint64_t local_value;
 230   if (not value)
 231     value= &local_value;
 232
 233   memcached_return_t rc;
 234   if (memcached_failed(rc= initialize_query(ptr)))
 235   {
 236     return rc;
 237   }
 238
 239   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 240   {
 241     return rc;
 242   }
 243
 244
 245   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 246   if (ptr->flags.binary_protocol)
 247   {
 248     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 249                          group_key, group_key_length, key, key_length,
 250                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 251                          value);
 252   }
 253   else
 254   {
 255     rc= text_incr_decr(ptr, "decr", group_key, group_key_length, key, key_length, offset, value);
 256   }
 257
 258   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 259
 260   return rc;
 261 }
 262
 263 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 264                                                     const char *key,
 265                                                     size_t key_length,
 266                                                     uint64_t offset,
 267                                                     uint64_t initial,
 268                                                     time_t expiration,
 269                                                     uint64_t *value)
 270 {
 271   uint64_t local_value;
 272   if (! value)
 273     value= &local_value;
 274
 275   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 276                                                  key, key_length,
 277                                                  offset, initial, expiration, value);
 278 }
 279
 280 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 281                                                          const char *group_key,
 282                                                          size_t group_key_length,
 283                                                          const char *key,
 284                                                          size_t key_length,
 285                                                          uint64_t offset,
 286                                                          uint64_t initial,
 287                                                          time_t expiration,
 288                                                          uint64_t *value)
 289 {
 290   uint64_t local_value;
 291   if (not value)
 292     value= &local_value;
 293
 294   memcached_return_t rc;
 295   if (memcached_failed(rc= initialize_query(ptr)))
 296   {
 297     return rc;
 298   }
 299
 300   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 301   {
 302     return rc;
 303   }
 304
 305   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 306   if (ptr->flags.binary_protocol)
 307     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 308                          group_key, group_key_length, key, key_length,
 309                          offset, initial, (uint32_t)expiration,
 310                          value);
 311   else
 312     rc= MEMCACHED_PROTOCOL_ERROR;
 313
 314   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 315
 316   return rc;
 317 }
 318
 319 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 320                                                     const char *key,
 321                                                     size_t key_length,
 322                                                     uint64_t offset,
 323                                                     uint64_t initial,
 324                                                     time_t expiration,
 325                                                     uint64_t *value)
 326 {
 327   uint64_t local_value;
 328   if (! value)
 329     value= &local_value;
 330
 331   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 332                                                  key, key_length,
 333                                                  offset, initial, expiration, value);
 334 }
 335
 336 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 337                                                            const char *group_key,
 338                                                            size_t group_key_length,
 339                                                            const char *key,
 340                                                            size_t key_length,
 341                                                            uint64_t offset,
 342                                                            uint64_t initial,
 343                                                            time_t expiration,
 344                                                            uint64_t *value)
 345 {
 346   uint64_t local_value;
 347   if (not value)
 348     value= &local_value;
 349
 350   memcached_return_t rc;
 351   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 352   {
 353     return rc;
 354   }
 355
 356   if (memcached_failed(rc= initialize_query(ptr)))
 357   {
 358     return rc;
 359   }
 360
 361
 362   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 363   if (ptr->flags.binary_protocol)
 364   {
 365     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 366                          group_key, group_key_length, key, key_length,
 367                          offset, initial, (uint32_t)expiration,
 368                          value);
 369   }
 370   else
 371   {
 372     rc= MEMCACHED_PROTOCOL_ERROR;
 373   }
 374
 375   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 376
 377   return rc;
 378 }
 379