git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/memcached.c

   1 /* LibMemcached
   2  * Copyright (C) 2006-2010 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary:
   9  *
  10  */
  11
  12 #include "common.h"
  13
  14 static const memcached_st global_copy= {
  15   .state= {
  16     .is_purging= false,
  17     .is_processing_input= false,
  18     .is_time_for_rebuild= false,
  19   },
  20   .flags= {
  21     .auto_eject_hosts= false,
  22     .binary_protocol= false,
  23     .buffer_requests= false,
  24     .cork= false,
  25     .hash_with_prefix_key= false,
  26     .ketama_weighted= false,
  27     .no_block= false,
  28     .no_reply= false,
  29     .randomize_replica_read= false,
  30     .reuse_memory= false,
  31     .support_cas= false,
  32     .tcp_nodelay= false,
  33     .use_cache_lookups= false,
  34     .use_sort_hosts= false,
  35     .use_udp= false,
  36     .verify_key= false,
  37     .tcp_keepalive= false,
  38     .load_from_file= false
  39
  40   }
  41 };
  42
  43 static inline bool _memcached_init(memcached_st *self)
  44 {
  45   self->state= global_copy.state;
  46   self->flags= global_copy.flags;
  47
  48   self->distribution= MEMCACHED_DISTRIBUTION_MODULA;
  49
  50   hashkit_st *hash_ptr;
  51   hash_ptr= hashkit_create(&self->hashkit);
  52   if (! hash_ptr)
  53     return false;
  54
  55   self->continuum_points_counter= 0;
  56
  57   self->number_of_hosts= 0;
  58   self->servers= NULL;
  59   self->last_disconnected_server= NULL;
  60
  61   self->snd_timeout= 0;
  62   self->rcv_timeout= 0;
  63   self->server_failure_limit= 0;
  64
  65   /* TODO, Document why we picked these defaults */
  66   self->io_msg_watermark= 500;
  67   self->io_bytes_watermark= 65 * 1024;
  68
  69   self->tcp_keepidle= 0;
  70
  71   self->io_key_prefetch= 0;
  72   self->cached_errno= 0;
  73   self->poll_timeout= MEMCACHED_DEFAULT_TIMEOUT;
  74   self->connect_timeout= MEMCACHED_DEFAULT_CONNECT_TIMEOUT;
  75   self->retry_timeout= 0;
  76   self->continuum_count= 0;
  77
  78   self->send_size= -1;
  79   self->recv_size= -1;
  80
  81   self->user_data= NULL;
  82   self->next_distribution_rebuild= 0;
  83   self->number_of_replicas= 0;
  84   hash_ptr= hashkit_create(&self->distribution_hashkit);
  85   if (! hash_ptr)
  86     return false;
  87   self->continuum= NULL;
  88
  89   self->allocators= memcached_allocators_return_default();
  90
  91   self->on_clone= NULL;
  92   self->on_cleanup= NULL;
  93   self->get_key_failure= NULL;
  94   self->delete_trigger= NULL;
  95   self->callbacks= NULL;
  96   self->sasl.callbacks= NULL;
  97   self->sasl.is_allocated= false;
  98
  99   self->error_messages= NULL;
 100   self->prefix_key= NULL;
 101
 102   return true;
 103 }
 104
 105 static void _free(memcached_st *ptr, bool release_st)
 106 {
 107   /* If we have anything open, lets close it now */
 108   memcached_quit(ptr);
 109   memcached_server_list_free(memcached_server_list(ptr));
 110   memcached_result_free(&ptr->result);
 111
 112   if (ptr->last_disconnected_server)
 113     memcached_server_free(ptr->last_disconnected_server);
 114
 115   if (ptr->on_cleanup)
 116     ptr->on_cleanup(ptr);
 117
 118   if (ptr->continuum)
 119     libmemcached_free(ptr, ptr->continuum);
 120
 121   memcached_array_free(ptr->prefix_key);
 122   ptr->prefix_key= NULL;
 123
 124   memcached_error_free(ptr);
 125
 126   if (ptr->sasl.callbacks)
 127   {
 128 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 129     memcached_destroy_sasl_auth_data(ptr);
 130 #endif
 131   }
 132
 133   if (memcached_is_allocated(ptr) && release_st)
 134   {
 135     libmemcached_free(ptr, ptr);
 136   }
 137 }
 138
 139 memcached_st *memcached_create(memcached_st *ptr)
 140 {
 141   if (ptr == NULL)
 142   {
 143     ptr= (memcached_st *)malloc(sizeof(memcached_st));
 144
 145     if (! ptr)
 146     {
 147       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 148     }
 149
 150     ptr->options.is_allocated= true;
 151   }
 152   else
 153   {
 154     ptr->options.is_allocated= false;
 155   }
 156
 157 #if 0
 158   memcached_set_purging(ptr, false);
 159   memcached_set_processing_input(ptr, false);
 160 #endif
 161
 162   if (! _memcached_init(ptr))
 163   {
 164     memcached_free(ptr);
 165     return NULL;
 166   }
 167
 168   if (! memcached_result_create(ptr, &ptr->result))
 169   {
 170     memcached_free(ptr);
 171     return NULL;
 172   }
 173
 174   WATCHPOINT_ASSERT_INITIALIZED(&ptr->result);
 175
 176   return ptr;
 177 }
 178
 179 void memcached_reset(memcached_st *ptr)
 180 {
 181   WATCHPOINT_ASSERT(ptr);
 182   if (! ptr)
 183     return;
 184
 185   bool stored_is_allocated= memcached_is_allocated(ptr);
 186   _free(ptr, false);
 187   memcached_create(ptr);
 188   memcached_set_allocated(ptr, stored_is_allocated);
 189 }
 190
 191 void memcached_servers_reset(memcached_st *ptr)
 192 {
 193   memcached_server_list_free(memcached_server_list(ptr));
 194
 195   memcached_server_list_set(ptr, NULL);
 196   ptr->number_of_hosts= 0;
 197   if (ptr->last_disconnected_server)
 198   {
 199     memcached_server_free(ptr->last_disconnected_server);
 200   }
 201   ptr->last_disconnected_server= NULL;
 202   ptr->server_failure_limit= 0;
 203 }
 204
 205 void memcached_reset_last_disconnected_server(memcached_st *ptr)
 206 {
 207   if (ptr->last_disconnected_server)
 208   {
 209     memcached_server_free(ptr->last_disconnected_server);
 210     ptr->last_disconnected_server= NULL;
 211   }
 212 }
 213
 214 void memcached_free(memcached_st *ptr)
 215 {
 216   _free(ptr, true);
 217 }
 218
 219 /*
 220   clone is the destination, while source is the structure to clone.
 221   If source is NULL the call is the same as if a memcached_create() was
 222   called.
 223 */
 224 memcached_st *memcached_clone(memcached_st *clone, const memcached_st *source)
 225 {
 226   memcached_return_t rc= MEMCACHED_SUCCESS;
 227   memcached_st *new_clone;
 228
 229   if (source == NULL)
 230     return memcached_create(clone);
 231
 232   if (clone && memcached_is_allocated(clone))
 233   {
 234     return NULL;
 235   }
 236
 237   new_clone= memcached_create(clone);
 238
 239   if (new_clone == NULL)
 240     return NULL;
 241
 242   new_clone->flags= source->flags;
 243   new_clone->send_size= source->send_size;
 244   new_clone->recv_size= source->recv_size;
 245   new_clone->poll_timeout= source->poll_timeout;
 246   new_clone->connect_timeout= source->connect_timeout;
 247   new_clone->retry_timeout= source->retry_timeout;
 248   new_clone->distribution= source->distribution;
 249
 250   hashkit_st *hash_ptr;
 251
 252   hash_ptr= hashkit_clone(&new_clone->hashkit, &source->hashkit);
 253   if (! hash_ptr)
 254   {
 255     memcached_free(new_clone);
 256     return NULL;
 257   }
 258
 259   hash_ptr= hashkit_clone(&new_clone->distribution_hashkit, &source->distribution_hashkit);
 260   if (! hash_ptr)
 261   {
 262     memcached_free(new_clone);
 263     return NULL;
 264   }
 265
 266   new_clone->user_data= source->user_data;
 267
 268   new_clone->snd_timeout= source->snd_timeout;
 269   new_clone->rcv_timeout= source->rcv_timeout;
 270
 271   new_clone->on_clone= source->on_clone;
 272   new_clone->on_cleanup= source->on_cleanup;
 273
 274   new_clone->allocators= source->allocators;
 275
 276   new_clone->get_key_failure= source->get_key_failure;
 277   new_clone->delete_trigger= source->delete_trigger;
 278   new_clone->server_failure_limit= source->server_failure_limit;
 279   new_clone->io_msg_watermark= source->io_msg_watermark;
 280   new_clone->io_bytes_watermark= source->io_bytes_watermark;
 281   new_clone->io_key_prefetch= source->io_key_prefetch;
 282   new_clone->number_of_replicas= source->number_of_replicas;
 283   new_clone->tcp_keepidle= source->tcp_keepidle;
 284
 285   if (memcached_server_count(source))
 286     rc= memcached_push(new_clone, source);
 287
 288   if (rc != MEMCACHED_SUCCESS)
 289   {
 290     memcached_free(new_clone);
 291
 292     return NULL;
 293   }
 294
 295
 296   new_clone->prefix_key= memcached_array_clone(new_clone, source->prefix_key);
 297
 298 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 299   if (source->sasl.callbacks)
 300   {
 301     if (memcached_clone_sasl(new_clone, source) != MEMCACHED_SUCCESS)
 302     {
 303       memcached_free(new_clone);
 304       return NULL;
 305     }
 306   }
 307 #endif
 308
 309   rc= run_distribution(new_clone);
 310
 311   if (rc != MEMCACHED_SUCCESS)
 312   {
 313     memcached_free(new_clone);
 314
 315     return NULL;
 316   }
 317
 318   if (source->on_clone)
 319     source->on_clone(new_clone, source);
 320
 321   return new_clone;
 322 }
 323
 324 void *memcached_get_user_data(const memcached_st *ptr)
 325 {
 326   return ptr->user_data;
 327 }
 328
 329 void *memcached_set_user_data(memcached_st *ptr, void *data)
 330 {
 331   void *ret= ptr->user_data;
 332   ptr->user_data= data;
 333
 334   return ret;
 335 }
 336
 337 memcached_return_t memcached_push(memcached_st *destination, const memcached_st *source)
 338 {
 339   return memcached_server_push(destination, source->servers);
 340 }
 341
 342 memcached_server_write_instance_st memcached_server_instance_fetch(memcached_st *ptr, uint32_t server_key)
 343 {
 344   return &ptr->servers[server_key];
 345 }
 346
 347 memcached_server_instance_st memcached_server_instance_by_position(const memcached_st *ptr, uint32_t server_key)
 348 {
 349   return &ptr->servers[server_key];
 350 }