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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 #include <libmemcached/options.hpp>
  41 #include <libmemcached/virtual_bucket.h>
  42
  43 #if 0
  44 static const memcached_st global_copy= {
  45   .state= {
  46     .is_purging= false, // .is_purging
  47     .is_processing_input= false, // is_processing_input
  48     .is_time_for_rebuild= false,
  49   },
  50   .flags= {
  51     .auto_eject_hosts= false,
  52     .binary_protocol= false,
  53     .buffer_requests= false,
  54     .hash_with_namespace= false,
  55     .no_block= false,
  56     .no_reply= false,
  57     .randomize_replica_read= false,
  58     .support_cas= false,
  59     .tcp_nodelay= false,
  60     .use_sort_hosts= false,
  61     .use_udp= false,
  62     .verify_key= false,
  63     .tcp_keepalive= false,
  64   },
  65 };
  66 #endif
  67
  68 static inline bool _memcached_init(memcached_st *self)
  69 {
  70   self->state.is_purging= false;
  71   self->state.is_processing_input= false;
  72   self->state.is_time_for_rebuild= false;
  73
  74   self->flags.auto_eject_hosts= false;
  75   self->flags.binary_protocol= false;
  76   self->flags.buffer_requests= false;
  77   self->flags.hash_with_namespace= false;
  78   self->flags.no_block= false;
  79   self->flags.no_reply= false;
  80   self->flags.randomize_replica_read= false;
  81   self->flags.support_cas= false;
  82   self->flags.tcp_nodelay= false;
  83   self->flags.use_sort_hosts= false;
  84   self->flags.use_udp= false;
  85   self->flags.verify_key= false;
  86   self->flags.tcp_keepalive= false;
  87
  88   self->virtual_bucket= NULL;
  89
  90   self->distribution= MEMCACHED_DISTRIBUTION_MODULA;
  91
  92   if (not hashkit_create(&self->hashkit))
  93     return false;
  94
  95   self->ketama.continuum= NULL;
  96   self->ketama.continuum_count= 0;
  97   self->ketama.continuum_points_counter= 0;
  98   self->ketama.next_distribution_rebuild= 0;
  99   self->ketama.weighted= false;
 100
 101   self->number_of_hosts= 0;
 102   self->servers= NULL;
 103   self->last_disconnected_server= NULL;
 104
 105   self->snd_timeout= 0;
 106   self->rcv_timeout= 0;
 107   self->server_failure_limit= 0;
 108   self->query_id= 1; // 0 is considered invalid
 109
 110   /* TODO, Document why we picked these defaults */
 111   self->io_msg_watermark= 500;
 112   self->io_bytes_watermark= 65 * 1024;
 113
 114   self->tcp_keepidle= 0;
 115
 116   self->io_key_prefetch= 0;
 117   self->poll_timeout= MEMCACHED_DEFAULT_TIMEOUT;
 118   self->connect_timeout= MEMCACHED_DEFAULT_CONNECT_TIMEOUT;
 119   self->retry_timeout= 0;
 120
 121   self->send_size= -1;
 122   self->recv_size= -1;
 123
 124   self->user_data= NULL;
 125   self->number_of_replicas= 0;
 126
 127   self->allocators= memcached_allocators_return_default();
 128
 129   self->on_clone= NULL;
 130   self->on_cleanup= NULL;
 131   self->get_key_failure= NULL;
 132   self->delete_trigger= NULL;
 133   self->callbacks= NULL;
 134   self->sasl.callbacks= NULL;
 135   self->sasl.is_allocated= false;
 136
 137   self->error_messages= NULL;
 138   self->_namespace= NULL;
 139   self->configure.initial_pool_size= 1;
 140   self->configure.max_pool_size= 1;
 141   self->configure.version= -1;
 142   self->configure.filename= NULL;
 143
 144   return true;
 145 }
 146
 147 static void _free(memcached_st *ptr, bool release_st)
 148 {
 149   /* If we have anything open, lets close it now */
 150   send_quit(ptr);
 151   memcached_server_list_free(memcached_server_list(ptr));
 152   memcached_result_free(&ptr->result);
 153
 154   memcached_virtual_bucket_free(ptr);
 155
 156   memcached_server_free(ptr->last_disconnected_server);
 157
 158   if (ptr->on_cleanup)
 159     ptr->on_cleanup(ptr);
 160
 161   libmemcached_free(ptr, ptr->ketama.continuum);
 162
 163   memcached_array_free(ptr->_namespace);
 164   ptr->_namespace= NULL;
 165
 166   memcached_error_free(*ptr);
 167
 168   if (ptr->sasl.callbacks)
 169   {
 170 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 171     memcached_destroy_sasl_auth_data(ptr);
 172 #endif
 173   }
 174
 175   if (release_st)
 176   {
 177     memcached_array_free(ptr->configure.filename);
 178     ptr->configure.filename= NULL;
 179   }
 180
 181   if (memcached_is_allocated(ptr) && release_st)
 182   {
 183     libmemcached_free(ptr, ptr);
 184   }
 185 }
 186
 187 memcached_st *memcached_create(memcached_st *ptr)
 188 {
 189   if (ptr == NULL)
 190   {
 191     ptr= (memcached_st *)malloc(sizeof(memcached_st));
 192
 193     if (not ptr)
 194     {
 195       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 196     }
 197
 198     ptr->options.is_allocated= true;
 199   }
 200   else
 201   {
 202     ptr->options.is_allocated= false;
 203   }
 204
 205 #if 0
 206   memcached_set_purging(ptr, false);
 207   memcached_set_processing_input(ptr, false);
 208 #endif
 209
 210   if (! _memcached_init(ptr))
 211   {
 212     memcached_free(ptr);
 213     return NULL;
 214   }
 215
 216   if (! memcached_result_create(ptr, &ptr->result))
 217   {
 218     memcached_free(ptr);
 219     return NULL;
 220   }
 221
 222   WATCHPOINT_ASSERT_INITIALIZED(&ptr->result);
 223
 224   return ptr;
 225 }
 226
 227 memcached_st *memcached(const char *string, size_t length)
 228 {
 229   memcached_st *self= memcached_create(NULL);
 230   if (not self)
 231   {
 232     errno= ENOMEM;
 233     return NULL;
 234   }
 235
 236   if (not length)
 237     return self;
 238
 239   memcached_return_t rc= memcached_parse_configuration(self, string, length);
 240
 241   if (memcached_success(rc) and memcached_parse_filename(self))
 242   {
 243     rc= memcached_parse_configure_file(*self, memcached_parse_filename(self), memcached_parse_filename_length(self));
 244   }
 245
 246   if (memcached_failed(rc))
 247   {
 248     memcached_free(self);
 249     errno= EINVAL;
 250     return NULL;
 251   }
 252
 253   return self;
 254 }
 255
 256 memcached_return_t memcached_reset(memcached_st *ptr)
 257 {
 258   WATCHPOINT_ASSERT(ptr);
 259   if (not ptr)
 260     return MEMCACHED_INVALID_ARGUMENTS;
 261
 262   bool stored_is_allocated= memcached_is_allocated(ptr);
 263   uint64_t query_id= ptr->query_id;
 264   _free(ptr, false);
 265   memcached_create(ptr);
 266   memcached_set_allocated(ptr, stored_is_allocated);
 267   ptr->query_id= query_id;
 268
 269   if (ptr->configure.filename)
 270   {
 271     return memcached_parse_configure_file(*ptr, memcached_param_array(ptr->configure.filename));
 272   }
 273
 274   return MEMCACHED_SUCCESS;
 275 }
 276
 277 void memcached_servers_reset(memcached_st *self)
 278 {
 279   if (not self)
 280     return;
 281
 282   memcached_server_list_free(memcached_server_list(self));
 283
 284   memcached_server_list_set(self, NULL);
 285   self->number_of_hosts= 0;
 286   memcached_server_free(self->last_disconnected_server);
 287   self->last_disconnected_server= NULL;
 288   self->server_failure_limit= 0;
 289 }
 290
 291 void memcached_reset_last_disconnected_server(memcached_st *self)
 292 {
 293   if (not self)
 294     return;
 295
 296   memcached_server_free(self->last_disconnected_server);
 297   self->last_disconnected_server= NULL;
 298 }
 299
 300 void memcached_free(memcached_st *ptr)
 301 {
 302   if (not ptr)
 303     return;
 304
 305   _free(ptr, true);
 306 }
 307
 308 /*
 309   clone is the destination, while source is the structure to clone.
 310   If source is NULL the call is the same as if a memcached_create() was
 311   called.
 312 */
 313 memcached_st *memcached_clone(memcached_st *clone, const memcached_st *source)
 314 {
 315   memcached_return_t rc= MEMCACHED_SUCCESS;
 316
 317   if (not source)
 318     return memcached_create(clone);
 319
 320   if (clone && memcached_is_allocated(clone))
 321   {
 322     return NULL;
 323   }
 324
 325   memcached_st *new_clone= memcached_create(clone);
 326
 327   if (not new_clone)
 328     return NULL;
 329
 330   new_clone->flags= source->flags;
 331   new_clone->send_size= source->send_size;
 332   new_clone->recv_size= source->recv_size;
 333   new_clone->poll_timeout= source->poll_timeout;
 334   new_clone->connect_timeout= source->connect_timeout;
 335   new_clone->retry_timeout= source->retry_timeout;
 336   new_clone->distribution= source->distribution;
 337
 338   if (not hashkit_clone(&new_clone->hashkit, &source->hashkit))
 339   {
 340     memcached_free(new_clone);
 341     return NULL;
 342   }
 343
 344   new_clone->user_data= source->user_data;
 345
 346   new_clone->snd_timeout= source->snd_timeout;
 347   new_clone->rcv_timeout= source->rcv_timeout;
 348
 349   new_clone->on_clone= source->on_clone;
 350   new_clone->on_cleanup= source->on_cleanup;
 351
 352   new_clone->allocators= source->allocators;
 353
 354   new_clone->get_key_failure= source->get_key_failure;
 355   new_clone->delete_trigger= source->delete_trigger;
 356   new_clone->server_failure_limit= source->server_failure_limit;
 357   new_clone->io_msg_watermark= source->io_msg_watermark;
 358   new_clone->io_bytes_watermark= source->io_bytes_watermark;
 359   new_clone->io_key_prefetch= source->io_key_prefetch;
 360   new_clone->number_of_replicas= source->number_of_replicas;
 361   new_clone->tcp_keepidle= source->tcp_keepidle;
 362
 363   if (memcached_server_count(source))
 364     rc= memcached_push(new_clone, source);
 365
 366   if (rc != MEMCACHED_SUCCESS)
 367   {
 368     memcached_free(new_clone);
 369
 370     return NULL;
 371   }
 372
 373
 374   new_clone->_namespace= memcached_array_clone(new_clone, source->_namespace);
 375   new_clone->configure.filename= memcached_array_clone(new_clone, source->_namespace);
 376
 377 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 378   if (source->sasl.callbacks)
 379   {
 380     if (memcached_clone_sasl(new_clone, source) != MEMCACHED_SUCCESS)
 381     {
 382       memcached_free(new_clone);
 383       return NULL;
 384     }
 385   }
 386 #endif
 387
 388   rc= run_distribution(new_clone);
 389
 390   if (rc != MEMCACHED_SUCCESS)
 391   {
 392     memcached_free(new_clone);
 393
 394     return NULL;
 395   }
 396
 397   if (source->on_clone)
 398     source->on_clone(new_clone, source);
 399
 400   return new_clone;
 401 }
 402
 403 void *memcached_get_user_data(const memcached_st *ptr)
 404 {
 405   return ptr->user_data;
 406 }
 407
 408 void *memcached_set_user_data(memcached_st *ptr, void *data)
 409 {
 410   void *ret= ptr->user_data;
 411   ptr->user_data= data;
 412
 413   return ret;
 414 }
 415
 416 memcached_return_t memcached_push(memcached_st *destination, const memcached_st *source)
 417 {
 418   return memcached_server_push(destination, source->servers);
 419 }
 420
 421 memcached_server_write_instance_st memcached_server_instance_fetch(memcached_st *ptr, uint32_t server_key)
 422 {
 423   return &ptr->servers[server_key];
 424 }
 425
 426 memcached_server_instance_st memcached_server_instance_by_position(const memcached_st *ptr, uint32_t server_key)
 427 {
 428   return &ptr->servers[server_key];
 429 }
 430
 431 uint64_t memcached_query_id(const memcached_st *self)
 432 {
 433   if (not self)
 434     return 0;
 435
 436   return self->query_id;
 437 }