git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/behavior.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 #include <libmemcached/options.hpp>
  40 #include <libmemcached/virtual_bucket.h>
  41
  42 #include <ctime>
  43 #include <sys/types.h>
  44
  45 /*
  46   This function is used to modify the behavior of running client.
  47
  48   We quit all connections so we can reset the sockets.
  49 */
  50
  51 memcached_return_t memcached_behavior_set(memcached_st *ptr,
  52                                           const memcached_behavior_t flag,
  53                                           uint64_t data)
  54 {
  55   if (ptr == NULL)
  56   {
  57     return MEMCACHED_INVALID_ARGUMENTS;
  58   }
  59
  60   switch (flag)
  61   {
  62   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
  63     ptr->number_of_replicas= (uint32_t)data;
  64     break;
  65
  66   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
  67     ptr->io_msg_watermark= (uint32_t) data;
  68     break;
  69
  70   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
  71     ptr->io_bytes_watermark= (uint32_t)data;
  72     break;
  73
  74   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
  75     ptr->io_key_prefetch = (uint32_t)data;
  76     break;
  77
  78   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
  79     ptr->snd_timeout= (int32_t)data;
  80     break;
  81
  82   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
  83     ptr->rcv_timeout= (int32_t)data;
  84     break;
  85
  86   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS:
  87     ptr->flags.auto_eject_hosts= bool(data);
  88
  89   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
  90     if (data == 0)
  91     {
  92       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
  93                                         memcached_literal_param("MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT requires a value greater then zero."));
  94     }
  95     ptr->server_failure_limit= uint32_t(data);
  96     break;
  97
  98   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
  99     send_quit(ptr); // We need t shutdown all of the connections to make sure we do the correct protocol
 100     if (data)
 101     {
 102       ptr->flags.verify_key= false;
 103     }
 104     ptr->flags.binary_protocol= bool(data);
 105     break;
 106
 107   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
 108     ptr->flags.support_cas= bool(data);
 109     break;
 110
 111   case MEMCACHED_BEHAVIOR_NO_BLOCK:
 112     ptr->flags.no_block= bool(data);
 113     send_quit(ptr);
 114     break;
 115
 116   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
 117     if (memcached_is_udp(ptr))
 118     {
 119       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 120                                  memcached_literal_param("MEMCACHED_BEHAVIOR_BUFFER_REQUESTS cannot be set while MEMCACHED_BEHAVIOR_USE_UDP is enabled."));
 121     }
 122     ptr->flags.buffer_requests= bool(data);
 123     send_quit(ptr);
 124     break;
 125
 126   case MEMCACHED_BEHAVIOR_USE_UDP:
 127     send_quit(ptr); // We need t shutdown all of the connections to make sure we do the correct protocol
 128     ptr->flags.use_udp= bool(data);
 129     if (bool(data))
 130     {
 131       ptr->flags.reply= false;
 132       ptr->flags.buffer_requests= false;
 133     }
 134     else
 135     {
 136       ptr->flags.reply= true;
 137     }
 138     break;
 139
 140   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
 141     ptr->flags.tcp_nodelay= bool(data);
 142     send_quit(ptr);
 143     break;
 144
 145   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
 146     ptr->flags.tcp_keepalive= bool(data);
 147     send_quit(ptr);
 148     break;
 149
 150   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
 151     return memcached_behavior_set_distribution(ptr, (memcached_server_distribution_t)data);
 152
 153   case MEMCACHED_BEHAVIOR_KETAMA:
 154     {
 155       if (data) // Turn on
 156       {
 157         return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
 158       }
 159
 160       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_MODULA);
 161     }
 162
 163   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 164     {
 165       (void)memcached_behavior_set_key_hash(ptr, MEMCACHED_HASH_MD5);
 166       (void)memcached_behavior_set_distribution_hash(ptr, MEMCACHED_HASH_MD5);
 167       ptr->ketama.weighted= bool(data);
 168       /**
 169         @note We try to keep the same distribution going. This should be deprecated and rewritten.
 170       */
 171       return memcached_behavior_set_distribution(ptr, MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA);
 172     }
 173
 174   case MEMCACHED_BEHAVIOR_HASH:
 175     return memcached_behavior_set_key_hash(ptr, (memcached_hash_t)(data));
 176
 177   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 178     return memcached_behavior_set_distribution_hash(ptr, (memcached_hash_t)(data));
 179
 180   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 181     return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 182                                       memcached_literal_param("MEMCACHED_BEHAVIOR_CACHE_LOOKUPS has been deprecated."));
 183
 184   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 185     if (ptr->flags.binary_protocol)
 186     {
 187       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 188                                         memcached_literal_param("MEMCACHED_BEHAVIOR_VERIFY_KEY if the binary protocol has been enabled."));
 189     }
 190     ptr->flags.verify_key= bool(data);
 191     break;
 192
 193   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 194     {
 195       ptr->flags.use_sort_hosts= bool(data);
 196       return run_distribution(ptr);
 197     }
 198
 199   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 200     ptr->poll_timeout= (int32_t)data;
 201     break;
 202
 203   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 204     ptr->connect_timeout= (int32_t)data;
 205     break;
 206
 207   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 208     if (data == 0)
 209     {
 210       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 211                                         memcached_literal_param("MEMCACHED_BEHAVIOR_RETRY_TIMEOUT requires a value greater then zero."));
 212     }
 213     ptr->retry_timeout= int32_t(data);
 214     break;
 215
 216   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 217     ptr->send_size= (int32_t)data;
 218     send_quit(ptr);
 219     break;
 220
 221   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 222     ptr->recv_size= (int32_t)data;
 223     send_quit(ptr);
 224     break;
 225
 226   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 227     ptr->tcp_keepidle= (uint32_t)data;
 228     send_quit(ptr);
 229     break;
 230
 231   case MEMCACHED_BEHAVIOR_USER_DATA:
 232     return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 233                                memcached_literal_param("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 234
 235   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 236     ptr->flags.hash_with_namespace= bool(data);
 237     break;
 238
 239   case MEMCACHED_BEHAVIOR_NOREPLY:
 240     if (memcached_is_udp(ptr) and bool(data) == false)
 241     {
 242       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 243                                  memcached_literal_param("MEMCACHED_BEHAVIOR_NOREPLY cannot be disabled while MEMCACHED_BEHAVIOR_USE_UDP is enabled."));
 244     }
 245     // We reverse the logic here to make it easier to understand throughout the
 246     // code.
 247     ptr->flags.reply= bool(data) ? false : true;
 248     break;
 249
 250   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 251     ptr->flags.auto_eject_hosts= bool(data);
 252     break;
 253
 254   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 255       srandom((uint32_t) time(NULL));
 256       ptr->flags.randomize_replica_read= bool(data);
 257       break;
 258
 259   case MEMCACHED_BEHAVIOR_CORK:
 260       return memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 261                                  memcached_literal_param("MEMCACHED_BEHAVIOR_CORK is now incorporated into the driver by default."));
 262
 263   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 264       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 265                                  memcached_literal_param("MEMCACHED_BEHAVIOR_LOAD_FROM_FILE can not be set with memcached_behavior_set()"));
 266
 267   case MEMCACHED_BEHAVIOR_MAX:
 268   default:
 269       /* Shouldn't get here */
 270       assert_msg(0, "Invalid behavior passed to memcached_behavior_set()");
 271       return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 272                                  memcached_literal_param("Invalid behavior passed to memcached_behavior_set()"));
 273   }
 274
 275   return MEMCACHED_SUCCESS;
 276 }
 277
 278 bool _is_auto_eject_host(const memcached_st *ptr)
 279 {
 280   return ptr->flags.auto_eject_hosts;
 281 }
 282
 283 uint64_t memcached_behavior_get(memcached_st *ptr,
 284                                 const memcached_behavior_t flag)
 285 {
 286   if (not ptr)
 287   {
 288     return MEMCACHED_INVALID_ARGUMENTS;
 289   }
 290
 291   switch (flag)
 292   {
 293   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS:
 294     return ptr->number_of_replicas;
 295
 296   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK:
 297     return ptr->io_msg_watermark;
 298
 299   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK:
 300     return ptr->io_bytes_watermark;
 301
 302   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH:
 303     return ptr->io_key_prefetch;
 304
 305   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL:
 306     return ptr->flags.binary_protocol;
 307
 308   case MEMCACHED_BEHAVIOR_SUPPORT_CAS:
 309     return ptr->flags.support_cas;
 310
 311   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS:
 312     return true;
 313
 314   case MEMCACHED_BEHAVIOR_NO_BLOCK:
 315     return ptr->flags.no_block;
 316
 317   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS:
 318     return ptr->flags.buffer_requests;
 319
 320   case MEMCACHED_BEHAVIOR_USE_UDP:
 321     return memcached_is_udp(ptr);
 322
 323   case MEMCACHED_BEHAVIOR_TCP_NODELAY:
 324     return ptr->flags.tcp_nodelay;
 325
 326   case MEMCACHED_BEHAVIOR_VERIFY_KEY:
 327     return ptr->flags.verify_key;
 328
 329   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED:
 330     return ptr->ketama.weighted;
 331
 332   case MEMCACHED_BEHAVIOR_DISTRIBUTION:
 333     return ptr->distribution;
 334
 335   case MEMCACHED_BEHAVIOR_KETAMA:
 336     return (ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA) ? (uint64_t) 1 : 0;
 337
 338   case MEMCACHED_BEHAVIOR_HASH:
 339     return hashkit_get_function(&ptr->hashkit);
 340
 341   case MEMCACHED_BEHAVIOR_KETAMA_HASH:
 342     return hashkit_get_function(&ptr->hashkit);
 343
 344   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS:
 345   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT:
 346     return ptr->server_failure_limit;
 347
 348   case MEMCACHED_BEHAVIOR_SORT_HOSTS:
 349     return ptr->flags.use_sort_hosts;
 350
 351   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT:
 352     return (uint64_t)ptr->poll_timeout;
 353
 354   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT:
 355     return (uint64_t)ptr->connect_timeout;
 356
 357   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT:
 358     return (uint64_t)ptr->retry_timeout;
 359
 360   case MEMCACHED_BEHAVIOR_SND_TIMEOUT:
 361     return (uint64_t)ptr->snd_timeout;
 362
 363   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT:
 364     return (uint64_t)ptr->rcv_timeout;
 365
 366   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE:
 367     return (uint64_t)ptr->tcp_keepidle;
 368
 369   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE:
 370     {
 371       int sock_size= 0;
 372       socklen_t sock_length= sizeof(int);
 373
 374       if (ptr->send_size != -1) // If value is -1 then we are using the default
 375       {
 376         return (uint64_t) ptr->send_size;
 377       }
 378
 379       memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, 0);
 380
 381       if (instance) // If we have an instance we test, otherwise we just set and pray
 382       {
 383         /* REFACTOR */
 384         /* We just try the first host, and if it is down we return zero */
 385         if (memcached_failed(memcached_connect(instance)))
 386         {
 387           return 0;
 388         }
 389
 390         if (memcached_failed(memcached_io_wait_for_write(instance)))
 391         {
 392           return 0;
 393         }
 394
 395         if (getsockopt(instance->fd, SOL_SOCKET, SO_SNDBUF, &sock_size, &sock_length) < 0)
 396         {
 397           memcached_set_errno(*ptr, get_socket_errno(), MEMCACHED_AT);
 398           return 0; /* Zero means error */
 399         }
 400       }
 401
 402       return (uint64_t) sock_size;
 403     }
 404
 405   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE:
 406     {
 407       int sock_size= 0;
 408       socklen_t sock_length= sizeof(int);
 409
 410       if (ptr->recv_size != -1) // If value is -1 then we are using the default
 411         return (uint64_t) ptr->recv_size;
 412
 413       memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, 0);
 414
 415       /**
 416         @note REFACTOR
 417       */
 418       if (instance)
 419       {
 420         /* We just try the first host, and if it is down we return zero */
 421         if (memcached_failed(memcached_connect(instance)))
 422         {
 423           return 0;
 424         }
 425
 426         if (memcached_failed(memcached_io_wait_for_write(instance)))
 427         {
 428           return 0;
 429         }
 430
 431         if (getsockopt(instance->fd, SOL_SOCKET, SO_RCVBUF, &sock_size, &sock_length) < 0)
 432         {
 433           memcached_set_errno(*ptr, get_socket_errno(), MEMCACHED_AT);
 434           return 0; /* Zero means error */
 435         }
 436       }
 437
 438       return (uint64_t) sock_size;
 439     }
 440
 441   case MEMCACHED_BEHAVIOR_USER_DATA:
 442     memcached_set_error(*ptr, MEMCACHED_DEPRECATED, MEMCACHED_AT,
 443                         memcached_literal_param("MEMCACHED_BEHAVIOR_USER_DATA deprecated."));
 444     return 0;
 445
 446   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY:
 447     return ptr->flags.hash_with_namespace;
 448
 449   case MEMCACHED_BEHAVIOR_NOREPLY:
 450     return ptr->flags.reply ? false : true;
 451
 452   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS:
 453     return ptr->flags.auto_eject_hosts;
 454
 455   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ:
 456     return ptr->flags.randomize_replica_read;
 457
 458   case MEMCACHED_BEHAVIOR_CORK:
 459 #ifdef HAVE_MSG_MORE
 460     return true;
 461 #else
 462     return false;
 463 #endif
 464
 465   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE:
 466     return ptr->flags.tcp_keepalive;
 467
 468   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE:
 469     return bool(memcached_parse_filename(ptr));
 470
 471   case MEMCACHED_BEHAVIOR_MAX:
 472   default:
 473     assert_msg(0, "Invalid behavior passed to memcached_behavior_set()");
 474     return 0;
 475   }
 476
 477   /* NOTREACHED */
 478 }
 479
 480
 481 memcached_return_t memcached_behavior_set_distribution(memcached_st *ptr, memcached_server_distribution_t type)
 482 {
 483   if (type < MEMCACHED_DISTRIBUTION_CONSISTENT_MAX)
 484   {
 485     if (MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED)
 486     {
 487       ptr->ketama.weighted= true;
 488     }
 489     else
 490     {
 491       ptr->ketama.weighted= false;
 492     }
 493
 494     ptr->distribution= type;
 495     return run_distribution(ptr);
 496   }
 497
 498   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 499                              memcached_literal_param("Invalid memcached_server_distribution_t"));
 500 }
 501
 502
 503 memcached_server_distribution_t memcached_behavior_get_distribution(memcached_st *ptr)
 504 {
 505   return ptr->distribution;
 506 }
 507
 508 memcached_return_t memcached_behavior_set_key_hash(memcached_st *ptr, memcached_hash_t type)
 509 {
 510   if (hashkit_success(hashkit_set_function(&ptr->hashkit, (hashkit_hash_algorithm_t)type)))
 511   {
 512     return MEMCACHED_SUCCESS;
 513   }
 514
 515   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 516                              memcached_literal_param("Invalid memcached_hash_t()"));
 517 }
 518
 519 memcached_hash_t memcached_behavior_get_key_hash(memcached_st *ptr)
 520 {
 521   return (memcached_hash_t)hashkit_get_function(&ptr->hashkit);
 522 }
 523
 524 memcached_return_t memcached_behavior_set_distribution_hash(memcached_st *ptr, memcached_hash_t type)
 525 {
 526   if (hashkit_success(hashkit_set_distribution_function(&ptr->hashkit, (hashkit_hash_algorithm_t)type)))
 527     return MEMCACHED_SUCCESS;
 528
 529   return memcached_set_error(*ptr, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT,
 530                              memcached_literal_param("Invalid memcached_hash_t()"));
 531 }
 532
 533 memcached_hash_t memcached_behavior_get_distribution_hash(memcached_st *ptr)
 534 {
 535   return (memcached_hash_t)hashkit_get_function(&ptr->hashkit);
 536 }
 537
 538 const char *libmemcached_string_behavior(const memcached_behavior_t flag)
 539 {
 540   switch (flag)
 541   {
 542   case MEMCACHED_BEHAVIOR_NO_BLOCK: return "MEMCACHED_BEHAVIOR_NO_BLOCK";
 543   case MEMCACHED_BEHAVIOR_TCP_NODELAY: return "MEMCACHED_BEHAVIOR_TCP_NODELAY";
 544   case MEMCACHED_BEHAVIOR_HASH: return "MEMCACHED_BEHAVIOR_HASH";
 545   case MEMCACHED_BEHAVIOR_KETAMA: return "MEMCACHED_BEHAVIOR_KETAMA";
 546   case MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE";
 547   case MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE: return "MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE";
 548   case MEMCACHED_BEHAVIOR_CACHE_LOOKUPS: return "MEMCACHED_BEHAVIOR_CACHE_LOOKUPS";
 549   case MEMCACHED_BEHAVIOR_SUPPORT_CAS: return "MEMCACHED_BEHAVIOR_SUPPORT_CAS";
 550   case MEMCACHED_BEHAVIOR_POLL_TIMEOUT: return "MEMCACHED_BEHAVIOR_POLL_TIMEOUT";
 551   case MEMCACHED_BEHAVIOR_DISTRIBUTION: return "MEMCACHED_BEHAVIOR_DISTRIBUTION";
 552   case MEMCACHED_BEHAVIOR_BUFFER_REQUESTS: return "MEMCACHED_BEHAVIOR_BUFFER_REQUESTS";
 553   case MEMCACHED_BEHAVIOR_USER_DATA: return "MEMCACHED_BEHAVIOR_USER_DATA";
 554   case MEMCACHED_BEHAVIOR_SORT_HOSTS: return "MEMCACHED_BEHAVIOR_SORT_HOSTS";
 555   case MEMCACHED_BEHAVIOR_VERIFY_KEY: return "MEMCACHED_BEHAVIOR_VERIFY_KEY";
 556   case MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT: return "MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT";
 557   case MEMCACHED_BEHAVIOR_RETRY_TIMEOUT: return "MEMCACHED_BEHAVIOR_RETRY_TIMEOUT";
 558   case MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED: return "MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED";
 559   case MEMCACHED_BEHAVIOR_KETAMA_HASH: return "MEMCACHED_BEHAVIOR_KETAMA_HASH";
 560   case MEMCACHED_BEHAVIOR_BINARY_PROTOCOL: return "MEMCACHED_BEHAVIOR_BINARY_PROTOCOL";
 561   case MEMCACHED_BEHAVIOR_SND_TIMEOUT: return "MEMCACHED_BEHAVIOR_SND_TIMEOUT";
 562   case MEMCACHED_BEHAVIOR_RCV_TIMEOUT: return "MEMCACHED_BEHAVIOR_RCV_TIMEOUT";
 563   case MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT: return "MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT";
 564   case MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK";
 565   case MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK: return "MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK";
 566   case MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH: return "MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH";
 567   case MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY: return "MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY";
 568   case MEMCACHED_BEHAVIOR_NOREPLY: return "MEMCACHED_BEHAVIOR_NOREPLY";
 569   case MEMCACHED_BEHAVIOR_USE_UDP: return "MEMCACHED_BEHAVIOR_USE_UDP";
 570   case MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS: return "MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS";
 571   case MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS: return "MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS";
 572   case MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS: return "MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS";
 573   case MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ: return "MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ";
 574   case MEMCACHED_BEHAVIOR_CORK: return "MEMCACHED_BEHAVIOR_CORK";
 575   case MEMCACHED_BEHAVIOR_TCP_KEEPALIVE: return "MEMCACHED_BEHAVIOR_TCP_KEEPALIVE";
 576   case MEMCACHED_BEHAVIOR_TCP_KEEPIDLE: return "MEMCACHED_BEHAVIOR_TCP_KEEPIDLE";
 577   case MEMCACHED_BEHAVIOR_LOAD_FROM_FILE: return "MEMCACHED_BEHAVIOR_LOAD_FROM_FILE";
 578   default:
 579   case MEMCACHED_BEHAVIOR_MAX: return "INVALID memcached_behavior_t";
 580   }
 581 }
 582
 583 const char *libmemcached_string_distribution(const memcached_server_distribution_t flag)
 584 {
 585   switch (flag)
 586   {
 587   case MEMCACHED_DISTRIBUTION_MODULA: return "MEMCACHED_DISTRIBUTION_MODULA";
 588   case MEMCACHED_DISTRIBUTION_CONSISTENT: return "MEMCACHED_DISTRIBUTION_CONSISTENT";
 589   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA";
 590   case MEMCACHED_DISTRIBUTION_RANDOM: return "MEMCACHED_DISTRIBUTION_RANDOM";
 591   case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY: return "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY";
 592   case MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED: return "MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED";
 593   case MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET: return "MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET";
 594   default:
 595   case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX: return "INVALID memcached_server_distribution_t";
 596   }
 597 }
 598
 599 memcached_return_t memcached_bucket_set(memcached_st *self,
 600                                         const uint32_t *host_map,
 601                                         const uint32_t *forward_map,
 602                                         const uint32_t buckets,
 603                                         const uint32_t replicas)
 604 {
 605   memcached_return_t rc;
 606
 607   if (self == NULL)
 608   {
 609     return MEMCACHED_INVALID_ARGUMENTS;
 610   }
 611
 612   if (host_map == NULL)
 613   {
 614     return MEMCACHED_INVALID_ARGUMENTS;
 615   }
 616
 617   memcached_server_distribution_t old= memcached_behavior_get_distribution(self);
 618
 619   if (memcached_failed(rc =memcached_behavior_set_distribution(self, MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET)))
 620   {
 621     return rc;
 622   }
 623
 624   if (memcached_failed(rc= memcached_virtual_bucket_create(self, host_map, forward_map, buckets, replicas)))
 625   {
 626     memcached_behavior_set_distribution(self, old);
 627   }
 628
 629   return rc;
 630 }