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