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, MEMCACHED_AT);
  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   {
  66     return memcached_set_error(*ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
  67                                memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
  68   }
  69
  70   memcached_return_t rc= memcached_do(instance, buffer, (size_t)send_length, true);
  71   if (no_reply or memcached_failed(rc))
  72     return rc;
  73
  74   rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  75
  76   /*
  77     So why recheck responce? Because the protocol is brain dead :)
  78     The number returned might end up equaling one of the string
  79     values. Less chance of a mistake with strncmp() so we will
  80     use it. We still called memcached_response() though since it
  81     worked its magic for non-blocking IO.
  82   */
  83   if (not strncmp(buffer, memcached_literal_param("ERROR\r\n")))
  84   {
  85     *value= 0;
  86     rc= MEMCACHED_PROTOCOL_ERROR;
  87   }
  88   else if (not strncmp(buffer, memcached_literal_param("CLIENT_ERROR\r\n")))
  89   {
  90     *value= 0;
  91     rc= MEMCACHED_PROTOCOL_ERROR;
  92   }
  93   else if (not strncmp(buffer, memcached_literal_param("NOT_FOUND\r\n")))
  94   {
  95     *value= 0;
  96     rc= MEMCACHED_NOTFOUND;
  97   }
  98   else
  99   {
 100     *value= strtoull(buffer, (char **)NULL, 10);
 101     rc= MEMCACHED_SUCCESS;
 102   }
 103
 104   return memcached_set_error(*instance, rc, MEMCACHED_AT);
 105 }
 106
 107 static memcached_return_t binary_incr_decr(memcached_st *ptr, uint8_t cmd,
 108                                            const char *group_key, size_t group_key_length,
 109                                            const char *key, size_t key_length,
 110                                            uint64_t offset, uint64_t initial,
 111                                            uint32_t expiration,
 112                                            uint64_t *value)
 113 {
 114   uint32_t server_key;
 115   memcached_server_write_instance_st instance;
 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   server_key= memcached_generate_hash_with_redistribution(ptr, group_key, group_key_length);
 122   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->prefix_key)));
 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->prefix_key) +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->prefix_key), ptr->prefix_key },
 148     { key_length, key }
 149   };
 150
 151   memcached_return_t rc;
 152   if ((rc= memcached_vdo(instance, vector, 3, true)) != MEMCACHED_SUCCESS)
 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   uint64_t local_value;
 170   if (! value)
 171     value= &local_value;
 172
 173   return memcached_increment_by_key(ptr, key, key_length, key, key_length, offset, value);
 174 }
 175
 176 memcached_return_t memcached_decrement(memcached_st *ptr,
 177                                        const char *key, size_t key_length,
 178                                        uint32_t offset,
 179                                        uint64_t *value)
 180 {
 181   uint64_t local_value;
 182   if (! value)
 183     value= &local_value;
 184
 185   return memcached_decrement_by_key(ptr, key, key_length, key, key_length, offset, value);
 186 }
 187
 188 memcached_return_t memcached_increment_by_key(memcached_st *ptr,
 189                                               const char *group_key, size_t group_key_length,
 190                                               const char *key, size_t key_length,
 191                                               uint64_t offset,
 192                                               uint64_t *value)
 193 {
 194   memcached_return_t rc;
 195   uint64_t local_value;
 196   if (not value)
 197     value= &local_value;
 198
 199   if (memcached_failed(rc= initialize_query(ptr)))
 200   {
 201     return rc;
 202   }
 203
 204   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 205   {
 206     return rc;
 207   }
 208
 209   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
 210   if (ptr->flags.binary_protocol)
 211   {
 212     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 213                          group_key, group_key_length, key, key_length,
 214                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 215                          value);
 216   }
 217   else
 218   {
 219      rc= text_incr_decr(ptr, "incr", group_key, group_key_length, key, key_length, offset, value);
 220   }
 221
 222   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
 223
 224   return rc;
 225 }
 226
 227 memcached_return_t memcached_decrement_by_key(memcached_st *ptr,
 228                                               const char *group_key, size_t group_key_length,
 229                                               const char *key, size_t key_length,
 230                                               uint64_t offset,
 231                                               uint64_t *value)
 232 {
 233   uint64_t local_value;
 234   if (not value)
 235     value= &local_value;
 236
 237   memcached_return_t rc;
 238   if (memcached_failed(rc= initialize_query(ptr)))
 239   {
 240     return rc;
 241   }
 242
 243   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 244   {
 245     return rc;
 246   }
 247
 248
 249   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
 250   if (ptr->flags.binary_protocol)
 251   {
 252     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 253                          group_key, group_key_length, key, key_length,
 254                          (uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
 255                          value);
 256   }
 257   else
 258   {
 259     rc= text_incr_decr(ptr, "decr", group_key, group_key_length, key, key_length, offset, value);
 260   }
 261
 262   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
 263
 264   return rc;
 265 }
 266
 267 memcached_return_t memcached_increment_with_initial(memcached_st *ptr,
 268                                                     const char *key,
 269                                                     size_t key_length,
 270                                                     uint64_t offset,
 271                                                     uint64_t initial,
 272                                                     time_t expiration,
 273                                                     uint64_t *value)
 274 {
 275   uint64_t local_value;
 276   if (! value)
 277     value= &local_value;
 278
 279   return memcached_increment_with_initial_by_key(ptr, key, key_length,
 280                                                  key, key_length,
 281                                                  offset, initial, expiration, value);
 282 }
 283
 284 memcached_return_t memcached_increment_with_initial_by_key(memcached_st *ptr,
 285                                                          const char *group_key,
 286                                                          size_t group_key_length,
 287                                                          const char *key,
 288                                                          size_t key_length,
 289                                                          uint64_t offset,
 290                                                          uint64_t initial,
 291                                                          time_t expiration,
 292                                                          uint64_t *value)
 293 {
 294   uint64_t local_value;
 295   if (not value)
 296     value= &local_value;
 297
 298   memcached_return_t rc;
 299   if (memcached_failed(rc= initialize_query(ptr)))
 300   {
 301     return rc;
 302   }
 303
 304   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 305   {
 306     return rc;
 307   }
 308
 309   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 310   if (ptr->flags.binary_protocol)
 311     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_INCREMENT,
 312                          group_key, group_key_length, key, key_length,
 313                          offset, initial, (uint32_t)expiration,
 314                          value);
 315   else
 316     rc= MEMCACHED_PROTOCOL_ERROR;
 317
 318   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 319
 320   return rc;
 321 }
 322
 323 memcached_return_t memcached_decrement_with_initial(memcached_st *ptr,
 324                                                     const char *key,
 325                                                     size_t key_length,
 326                                                     uint64_t offset,
 327                                                     uint64_t initial,
 328                                                     time_t expiration,
 329                                                     uint64_t *value)
 330 {
 331   uint64_t local_value;
 332   if (! value)
 333     value= &local_value;
 334
 335   return memcached_decrement_with_initial_by_key(ptr, key, key_length,
 336                                                  key, key_length,
 337                                                  offset, initial, expiration, value);
 338 }
 339
 340 memcached_return_t memcached_decrement_with_initial_by_key(memcached_st *ptr,
 341                                                            const char *group_key,
 342                                                            size_t group_key_length,
 343                                                            const char *key,
 344                                                            size_t key_length,
 345                                                            uint64_t offset,
 346                                                            uint64_t initial,
 347                                                            time_t expiration,
 348                                                            uint64_t *value)
 349 {
 350   uint64_t local_value;
 351   if (not value)
 352     value= &local_value;
 353
 354   memcached_return_t rc;
 355   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 356   {
 357     return rc;
 358   }
 359
 360   if (memcached_failed(rc= initialize_query(ptr)))
 361   {
 362     return rc;
 363   }
 364
 365
 366   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_START();
 367   if (ptr->flags.binary_protocol)
 368   {
 369     rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
 370                          group_key, group_key_length, key, key_length,
 371                          offset, initial, (uint32_t)expiration,
 372                          value);
 373   }
 374   else
 375   {
 376     rc= MEMCACHED_PROTOCOL_ERROR;
 377   }
 378
 379   LIBMEMCACHED_MEMCACHED_INCREMENT_WITH_INITIAL_END();
 380
 381   return rc;
 382 }
 383