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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   memcached_return_t rc;
  48   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  49   uint32_t server_key;
  50   memcached_server_write_instance_st instance;
  51   bool no_reply= ptr->flags.no_reply;
  52
  53   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  54     return MEMCACHED_BAD_KEY_PROVIDED;
  55
  56   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
  57   instance= memcached_server_instance_fetch(ptr, server_key);
  58
  59   int send_length;
  60   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  61                         "%s %.*s%.*s %" PRIu64 "%s\r\n", verb,
  62                         memcached_print_array(ptr->prefix_key),
  63                         (int)key_length, key,
  64                         offset, no_reply ? " noreply" : "");
  65   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0)
  66     return MEMCACHED_WRITE_FAILURE;
  67
  68   rc= memcached_do(instance, buffer, (size_t)send_length, true);
  69   if (no_reply || rc != MEMCACHED_SUCCESS)
  70     return rc;
  71
  72   rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  73
  74   /*
  75     So why recheck responce? Because the protocol is brain dead :)
  76     The number returned might end up equaling one of the string
  77     values. Less chance of a mistake with strncmp() so we will
  78     use it. We still called memcached_response() though since it
  79     worked its magic for non-blocking IO.
  80   */
  81   if (! strncmp(buffer, "ERROR\r\n", 7))
  82   {
  83     *value= 0;
  84     rc= MEMCACHED_PROTOCOL_ERROR;
  85   }
  86   else if (! strncmp(buffer, "CLIENT_ERROR\r\n", 14))
  87   {
  88     *value= 0;
  89     rc= MEMCACHED_PROTOCOL_ERROR;
  90   }
  91   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  92   {
  93     *value= 0;
  94     rc= MEMCACHED_NOTFOUND;
  95   }
  96   else
  97   {
  98     *value= strtoull(buffer, (char **)NULL, 10);
  99     rc= MEMCACHED_SUCCESS;
 100   }
 101
 102   return rc;
 103 }
 104
 105 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
 106                                            const char *group_key, size_t group_key_length,
 107                                            const char *key, size_t key_length,
 108                                            uint64_t offset, uint64_t initial,
 109                                            uint32_t expiration,
 110                                            uint64_t *value)
 111 {
 112   uint32_t server_key;
 113   memcached_server_write_instance_st instance;
 114   bool no_reply= ptr->flags.no_reply;
 115
 116   if (memcached_server_count(ptr) == 0)
 117     return memcached_set_error(ptr, MEMCACHED_NO_SERVERS, NULL);
 118
 119   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 120   instance= memcached_server_instance_fetch(ptr, server_key);
 121
 122   if (no_reply)
 123   {
 124     if(cmd == PROTOCOL_BINARY_CMD_DECREMENT)
 125       cmd= PROTOCOL_BINARY_CMD_DECREMENTQ;
 126     if(cmd == PROTOCOL_BINARY_CMD_INCREMENT)
 127       cmd= PROTOCOL_BINARY_CMD_INCREMENTQ;
 128   }
 129   protocol_binary_request_incr request= {}; // = {.bytes= {0}};
 130
 131   request.message.header.request.magic= PROTOCOL_BINARY_REQ;
 132   request.message.header.request.opcode= cmd;
 133   request.message.header.request.keylen= htons((uint16_t)(key_length + memcached_array_size(ptr->prefix_key)));
 134   request.message.header.request.extlen= 20;
 135   request.message.header.request.datatype= PROTOCOL_BINARY_RAW_BYTES;
 136   request.message.header.request.bodylen= htonl((uint32_t)(key_length + memcached_array_size(ptr->prefix_key) +request.message.header.request.extlen));
 137   request.message.body.delta= htonll(offset);
 138   request.message.body.initial= htonll(initial);
 139   request.message.body.expiration= htonl((uint32_t) expiration);
 140
 141   struct libmemcached_io_vector_st vector[]=
 142   {
 143     { sizeof(request.bytes), request.bytes },
 144     { memcached_array_size(ptr->prefix_key), ptr->prefix_key },
 145     { key_length, key }
 146   };
 147
 148   memcached_return_t rc;
 149   if ((rc= memcached_vdo(instance, vector, 3, true)) != MEMCACHED_SUCCESS)
 150   {
 151     memcached_io_reset(instance);
 152     return (rc == MEMCACHED_SUCCESS) ? MEMCACHED_WRITE_FAILURE : rc;
 153   }
 154
 155   if (no_reply)
 156     return MEMCACHED_SUCCESS;
 157
 158   return memcached_response(instance, (char*)value, sizeof(*value), NULL);
 159 }
 160
 161 memcached_return_t memcached_increment(memcached_st *ptr,
 162                                        const char *key, size_t key_length,
 163                                        uint32_t offset,
 164                                        uint64_t *value)
 165 {
 166   uint64_t local_value;
 167   if (! value)
 168     value= &local_value;
 169
 170   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 171 }
 172
 173 memcached_return_t memcached_decrement(memcached_st *ptr,
 174                                        const char *key, size_t key_length,
 175                                        uint32_t offset,
 176                                        uint64_t *value)
 177 {
 178   uint64_t local_value;
 179   if (! value)
 180     value= &local_value;
 181
 182   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 183 }
 184
 185 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 186                                               const char *group_key, size_t group_key_length,
 187                                               const char *key, size_t key_length,
 188                                               uint64_t offset,
 189                                               uint64_t *value)
 190 {
 191   memcached_return_t rc;
 192   uint64_t local_value;
 193   if (not value)
 194     value= &local_value;
 195
 196   if (memcached_failed(rc= initialize_query(ptr)))
 197   {
 198     return rc;
 199   }
 200
 201   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 202   {
 203     return rc;
 204   }
 205
 206   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 207   if (ptr->flags.binary_protocol)
 208   {
 209     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 210                          group_key, group_key_length, key, key_length,
 211                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 212                          value);
 213   }
 214   else
 215   {
 216      rc= text_incr_decr(ptr, "incr", group_key, group_key_length, key, key_length, offset, value);
 217   }
 218
 219   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 220
 221   return rc;
 222 }
 223
 224 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 225                                               const char *group_key, size_t group_key_length,
 226                                               const char *key, size_t key_length,
 227                                               uint64_t offset,
 228                                               uint64_t *value)
 229 {
 230   uint64_t local_value;
 231   if (not value)
 232     value= &local_value;
 233
 234   memcached_return_t rc;
 235   if (memcached_failed(rc= initialize_query(ptr)))
 236   {
 237     return rc;
 238   }
 239
 240   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 241   {
 242     return rc;
 243   }
 244
 245
 246   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 247   if (ptr->flags.binary_protocol)
 248   {
 249     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 250                          group_key, group_key_length, key, key_length,
 251                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 252                          value);
 253   }
 254   else
 255   {
 256     rc= text_incr_decr(ptr, "decr", group_key, group_key_length, key, key_length, offset, value);
 257   }
 258
 259   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 260
 261   return rc;
 262 }
 263
 264 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 265                                                     const char *key,
 266                                                     size_t key_length,
 267                                                     uint64_t offset,
 268                                                     uint64_t initial,
 269                                                     time_t expiration,
 270                                                     uint64_t *value)
 271 {
 272   uint64_t local_value;
 273   if (! value)
 274     value= &local_value;
 275
 276   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 277                                                  key, key_length,
 278                                                  offset, initial, expiration, value);
 279 }
 280
 281 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 282                                                          const char *group_key,
 283                                                          size_t group_key_length,
 284                                                          const char *key,
 285                                                          size_t key_length,
 286                                                          uint64_t offset,
 287                                                          uint64_t initial,
 288                                                          time_t expiration,
 289                                                          uint64_t *value)
 290 {
 291   uint64_t local_value;
 292   if (not value)
 293     value= &local_value;
 294
 295   memcached_return_t rc;
 296   if (memcached_failed(rc= initialize_query(ptr)))
 297   {
 298     return rc;
 299   }
 300
 301   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 302   {
 303     return rc;
 304   }
 305
 306   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 307   if (ptr->flags.binary_protocol)
 308     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 309                          group_key, group_key_length, key, key_length,
 310                          offset, initial, (uint32_t)expiration,
 311                          value);
 312   else
 313     rc= MEMCACHED_PROTOCOL_ERROR;
 314
 315   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 316
 317   return rc;
 318 }
 319
 320 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 321                                                     const char *key,
 322                                                     size_t key_length,
 323                                                     uint64_t offset,
 324                                                     uint64_t initial,
 325                                                     time_t expiration,
 326                                                     uint64_t *value)
 327 {
 328   uint64_t local_value;
 329   if (! value)
 330     value= &local_value;
 331
 332   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 333                                                  key, key_length,
 334                                                  offset, initial, expiration, value);
 335 }
 336
 337 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 338                                                            const char *group_key,
 339                                                            size_t group_key_length,
 340                                                            const char *key,
 341                                                            size_t key_length,
 342                                                            uint64_t offset,
 343                                                            uint64_t initial,
 344                                                            time_t expiration,
 345                                                            uint64_t *value)
 346 {
 347   uint64_t local_value;
 348   if (not value)
 349     value= &local_value;
 350
 351   memcached_return_t rc;
 352   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 353   {
 354     return rc;
 355   }
 356
 357   if (memcached_failed(rc= initialize_query(ptr)))
 358   {
 359     return rc;
 360   }
 361
 362
 363   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 364   if (ptr->flags.binary_protocol)
 365   {
 366     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 367                          group_key, group_key_length, key, key_length,
 368                          offset, initial, (uint32_t)expiration,
 369                          value);
 370   }
 371   else
 372   {
 373     rc= MEMCACHED_PROTOCOL_ERROR;
 374   }
 375
 376   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 377
 378   return rc;
 379 }
 380