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->prefix_key_length= 0;
  84   self->number_of_replicas= 0;
  85   hash_ptr= hashkit_create(&self->distribution_hashkit);
  86   if (! hash_ptr)
  87     return false;
  88   self->continuum= NULL;
  89
  90   self->allocators= memcached_allocators_return_default();
  91
  92   self->on_clone= NULL;
  93   self->on_cleanup= NULL;
  94   self->get_key_failure= NULL;
  95   self->delete_trigger= NULL;
  96   self->callbacks= NULL;
  97   self->sasl.callbacks= NULL;
  98   self->sasl.is_allocated= false;
  99
 100   self->error_messages= 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_error_free(ptr);
 122
 123   if (ptr->sasl.callbacks)
 124   {
 125 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 126     memcached_destroy_sasl_auth_data(ptr);
 127 #endif
 128   }
 129
 130   if (memcached_is_allocated(ptr) && release_st)
 131   {
 132     libmemcached_free(ptr, ptr);
 133   }
 134 }
 135
 136 memcached_st *memcached_create(memcached_st *ptr)
 137 {
 138   if (ptr == NULL)
 139   {
 140     ptr= (memcached_st *)malloc(sizeof(memcached_st));
 141
 142     if (! ptr)
 143     {
 144       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 145     }
 146
 147     ptr->options.is_allocated= true;
 148   }
 149   else
 150   {
 151     ptr->options.is_allocated= false;
 152   }
 153
 154 #if 0
 155   memcached_set_purging(ptr, false);
 156   memcached_set_processing_input(ptr, false);
 157 #endif
 158
 159   if (! _memcached_init(ptr))
 160   {
 161     memcached_free(ptr);
 162     return NULL;
 163   }
 164
 165   if (! memcached_result_create(ptr, &ptr->result))
 166   {
 167     memcached_free(ptr);
 168     return NULL;
 169   }
 170
 171   WATCHPOINT_ASSERT_INITIALIZED(&ptr->result);
 172
 173   return ptr;
 174 }
 175
 176 void memcached_reset(memcached_st *ptr)
 177 {
 178   WATCHPOINT_ASSERT(ptr);
 179   if (! ptr)
 180     return;
 181
 182   bool stored_is_allocated= memcached_is_allocated(ptr);
 183   _free(ptr, false);
 184   memcached_create(ptr);
 185   memcached_set_allocated(ptr, stored_is_allocated);
 186 }
 187
 188 void memcached_servers_reset(memcached_st *ptr)
 189 {
 190   memcached_server_list_free(memcached_server_list(ptr));
 191
 192   memcached_server_list_set(ptr, NULL);
 193   ptr->number_of_hosts= 0;
 194   if (ptr->last_disconnected_server)
 195   {
 196     memcached_server_free(ptr->last_disconnected_server);
 197   }
 198   ptr->last_disconnected_server= NULL;
 199   ptr->server_failure_limit= 0;
 200 }
 201
 202 void memcached_reset_last_disconnected_server(memcached_st *ptr)
 203 {
 204   if (ptr->last_disconnected_server)
 205   {
 206     memcached_server_free(ptr->last_disconnected_server);
 207     ptr->last_disconnected_server= NULL;
 208   }
 209 }
 210
 211 void memcached_free(memcached_st *ptr)
 212 {
 213   _free(ptr, true);
 214 }
 215
 216 /*
 217   clone is the destination, while source is the structure to clone.
 218   If source is NULL the call is the same as if a memcached_create() was
 219   called.
 220 */
 221 memcached_st *memcached_clone(memcached_st *clone, const memcached_st *source)
 222 {
 223   memcached_return_t rc= MEMCACHED_SUCCESS;
 224   memcached_st *new_clone;
 225
 226   if (source == NULL)
 227     return memcached_create(clone);
 228
 229   if (clone && memcached_is_allocated(clone))
 230   {
 231     return NULL;
 232   }
 233
 234   new_clone= memcached_create(clone);
 235
 236   if (new_clone == NULL)
 237     return NULL;
 238
 239   new_clone->flags= source->flags;
 240   new_clone->send_size= source->send_size;
 241   new_clone->recv_size= source->recv_size;
 242   new_clone->poll_timeout= source->poll_timeout;
 243   new_clone->connect_timeout= source->connect_timeout;
 244   new_clone->retry_timeout= source->retry_timeout;
 245   new_clone->distribution= source->distribution;
 246
 247   hashkit_st *hash_ptr;
 248
 249   hash_ptr= hashkit_clone(&new_clone->hashkit, &source->hashkit);
 250   if (! hash_ptr)
 251   {
 252     memcached_free(new_clone);
 253     return NULL;
 254   }
 255
 256   hash_ptr= hashkit_clone(&new_clone->distribution_hashkit, &source->distribution_hashkit);
 257   if (! hash_ptr)
 258   {
 259     memcached_free(new_clone);
 260     return NULL;
 261   }
 262
 263   new_clone->user_data= source->user_data;
 264
 265   new_clone->snd_timeout= source->snd_timeout;
 266   new_clone->rcv_timeout= source->rcv_timeout;
 267
 268   new_clone->on_clone= source->on_clone;
 269   new_clone->on_cleanup= source->on_cleanup;
 270
 271   new_clone->allocators= source->allocators;
 272
 273   new_clone->get_key_failure= source->get_key_failure;
 274   new_clone->delete_trigger= source->delete_trigger;
 275   new_clone->server_failure_limit= source->server_failure_limit;
 276   new_clone->io_msg_watermark= source->io_msg_watermark;
 277   new_clone->io_bytes_watermark= source->io_bytes_watermark;
 278   new_clone->io_key_prefetch= source->io_key_prefetch;
 279   new_clone->number_of_replicas= source->number_of_replicas;
 280   new_clone->tcp_keepidle= source->tcp_keepidle;
 281
 282   if (memcached_server_count(source))
 283     rc= memcached_push(new_clone, source);
 284
 285   if (rc != MEMCACHED_SUCCESS)
 286   {
 287     memcached_free(new_clone);
 288
 289     return NULL;
 290   }
 291
 292
 293   if (source->prefix_key_length)
 294   {
 295     strcpy(new_clone->prefix_key, source->prefix_key);
 296     new_clone->prefix_key_length= source->prefix_key_length;
 297   }
 298
 299 #ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
 300   if (source->sasl.callbacks)
 301   {
 302     if (memcached_clone_sasl(new_clone, source) != MEMCACHED_SUCCESS)
 303     {
 304       memcached_free(new_clone);
 305       return NULL;
 306     }
 307   }
 308 #endif
 309
 310   rc= run_distribution(new_clone);
 311
 312   if (rc != MEMCACHED_SUCCESS)
 313   {
 314     memcached_free(new_clone);
 315
 316     return NULL;
 317   }
 318
 319   if (source->on_clone)
 320     source->on_clone(new_clone, source);
 321
 322   return new_clone;
 323 }
 324
 325 void *memcached_get_user_data(const memcached_st *ptr)
 326 {
 327   return ptr->user_data;
 328 }
 329
 330 void *memcached_set_user_data(memcached_st *ptr, void *data)
 331 {
 332   void *ret= ptr->user_data;
 333   ptr->user_data= data;
 334
 335   return ret;
 336 }
 337
 338 memcached_return_t memcached_push(memcached_st *destination, const memcached_st *source)
 339 {
 340   return memcached_server_push(destination, source->servers);
 341 }
 342
 343 memcached_server_write_instance_st memcached_server_instance_fetch(memcached_st *ptr, uint32_t server_key)
 344 {
 345   return &ptr->servers[server_key];
 346 }
 347
 348 memcached_server_instance_st memcached_server_instance_by_position(const memcached_st *ptr, uint32_t server_key)
 349 {
 350   return &ptr->servers[server_key];
 351 }