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