git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/instance.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,
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  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  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 static inline void _server_init(memcached_instance_st* self, Memcached *root,
  41                                 const memcached_string_t& hostname,
  42                                 in_port_t port,
  43                                 uint32_t weight, memcached_connection_t type)
  44 {
  45   self->options.is_shutting_down= false;
  46   self->options.is_dead= false;
  47   self->options.ready= false;
  48   self->_events= 0;
  49   self->_revents= 0;
  50   self->cursor_active_= 0;
  51   self->port_= port;
  52   self->fd= INVALID_SOCKET;
  53   self->io_bytes_sent= 0;
  54   self->request_id= 0;
  55   self->server_failure_counter= 0;
  56   self->server_failure_counter_query_id= 0;
  57   self->server_timeout_counter= 0;
  58   self->server_timeout_counter_query_id= 0;
  59   self->weight= weight ? weight : 1; // 1 is the default weight value
  60   self->io_wait_count.read= 0;
  61   self->io_wait_count.write= 0;
  62   self->io_wait_count.timeouts= 0;
  63   self->io_wait_count._bytes_read= 0;
  64   self->major_version= UINT8_MAX;
  65   self->micro_version= UINT8_MAX;
  66   self->minor_version= UINT8_MAX;
  67   self->type= type;
  68   self->error_messages= NULL;
  69   self->read_ptr= self->read_buffer;
  70   self->read_buffer_length= 0;
  71   self->write_buffer_offset= 0;
  72   self->address_info= NULL;
  73   self->address_info_next= NULL;
  74
  75   self->state= MEMCACHED_SERVER_STATE_NEW;
  76   self->next_retry= 0;
  77
  78   self->root= root;
  79   if (root)
  80   {
  81     self->version= ++root->server_info.version;
  82   }
  83   else
  84   {
  85     self->version= UINT_MAX;
  86   }
  87   self->limit_maxbytes= 0;
  88   self->hostname(hostname);
  89 }
  90
  91 static memcached_instance_st* _server_create(memcached_instance_st* self, const memcached_st *memc)
  92 {
  93   if (self == NULL)
  94   {
  95    self= libmemcached_xmalloc(memc, memcached_instance_st);
  96
  97     if (self == NULL)
  98     {
  99       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 100     }
 101
 102     self->options.is_allocated= true;
 103   }
 104   else
 105   {
 106     self->options.is_allocated= false;
 107   }
 108
 109   self->options.is_initialized= true;
 110
 111   return self;
 112 }
 113
 114 void memcached_instance_st::events(short arg)
 115 {
 116   if ((_events | arg) == _events)
 117   {
 118     return;
 119   }
 120
 121   _events|= arg;
 122 }
 123
 124 void memcached_instance_st::revents(short arg)
 125 {
 126   if (arg)
 127   {
 128     options.ready= true;
 129   }
 130
 131   _revents= arg;
 132   _events&= short(~arg);
 133 }
 134
 135 memcached_instance_st* __instance_create_with(memcached_st *memc,
 136                                                     memcached_instance_st* self,
 137                                                     const memcached_string_t& hostname,
 138                                                     const in_port_t port,
 139                                                     uint32_t weight,
 140                                                     const memcached_connection_t type)
 141 {
 142   if (memcached_is_valid_servername(hostname) == false)
 143   {
 144     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 145     return NULL;
 146   }
 147
 148   self= _server_create(self, memc);
 149
 150   if (self == NULL)
 151   {
 152     return NULL;
 153   }
 154
 155   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 156
 157   if (memc and memcached_is_udp(memc))
 158   {
 159     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 160     memcached_io_init_udp_header(self, 0);
 161   }
 162
 163   return self;
 164 }
 165
 166 void __instance_free(memcached_instance_st* self)
 167 {
 168   memcached_quit_server(self, false);
 169
 170   self->clear_addrinfo();
 171   assert(self->address_info_next == NULL);
 172
 173   memcached_error_free(*self);
 174
 175   if (memcached_is_allocated(self))
 176   {
 177     libmemcached_free(self->root, self);
 178   }
 179   else
 180   {
 181     self->options.is_initialized= false;
 182   }
 183 }
 184
 185 void memcached_instance_free(memcached_instance_st* self)
 186 {
 187   if (self)
 188   {
 189     __instance_free(self);
 190   }
 191 }
 192
 193 memcached_return_t memcached_server_cursor(const memcached_st* shell,
 194                                            const memcached_server_fn *callback,
 195                                            void *context,
 196                                            uint32_t number_of_callbacks)
 197 {
 198   const Memcached* memc= memcached2Memcached(shell);
 199   memcached_return_t rc;
 200   if (memcached_failed(rc= initialize_const_query(memc)))
 201   {
 202     return rc;
 203   }
 204
 205   size_t errors= 0;
 206   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 207   {
 208     memcached_instance_st* instance= memcached_instance_by_position(memc, x);
 209
 210     for (uint32_t y= 0; y < number_of_callbacks; y++)
 211     {
 212       memcached_return_t ret= (*callback[y])(memc, instance, context);
 213
 214       if (memcached_failed(ret))
 215       {
 216         errors++;
 217         continue;
 218       }
 219     }
 220   }
 221
 222   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 223 }
 224
 225 memcached_return_t memcached_server_execute(memcached_st *memc,
 226                                             memcached_server_execute_fn callback,
 227                                             void *context)
 228 {
 229   if (callback == NULL)
 230   {
 231     return MEMCACHED_INVALID_ARGUMENTS;
 232   }
 233
 234   bool some_errors= false;;
 235   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 236   {
 237     memcached_instance_st* instance= memcached_instance_fetch(memc, x);
 238
 239     memcached_return_t rc= (*callback)(memc, instance, context);
 240     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 241     {
 242       return rc;
 243     }
 244     else if (memcached_fatal(rc))
 245     {
 246       some_errors= true;
 247     }
 248   }
 249
 250   (void)some_errors;
 251   return MEMCACHED_SUCCESS;
 252 }
 253
 254 const memcached_instance_st * memcached_server_by_key(memcached_st *shell,
 255                                                      const char *key,
 256                                                      size_t key_length,
 257                                                      memcached_return_t *error)
 258 {
 259   Memcached* memc= memcached2Memcached(shell);
 260   memcached_return_t unused;
 261   if (error == NULL)
 262   {
 263     error= &unused;
 264   }
 265
 266
 267   memcached_return_t rc;
 268   if (memcached_failed(rc= initialize_const_query(memc)))
 269   {
 270     *error= rc;
 271     return NULL;
 272   }
 273
 274   if (memcached_failed((memcached_key_test(*memc, (const char **)&key, &key_length, 1))))
 275   {
 276     *error= memcached_last_error(memc);
 277     return NULL;
 278   }
 279
 280   uint32_t server_key= memcached_generate_hash(memc, key, key_length);
 281   return memcached_instance_by_position(memc, server_key);
 282 }
 283
 284 /*
 285   If we do not have a valid object to clone from, we toss an error.
 286 */
 287 static memcached_instance_st* memcached_instance_clone(memcached_instance_st* source)
 288 {
 289   /* We just do a normal create if source is missing */
 290   if (source == NULL)
 291   {
 292     return NULL;
 293   }
 294
 295   memcached_string_t hostname_= { memcached_string_make_from_cstr(source->hostname()) };
 296   return __instance_create_with(source->root,
 297                                 NULL,
 298                                 hostname_,
 299                                 source->port(), source->weight,
 300                                 source->type);
 301 }
 302
 303 void set_last_disconnected_host(memcached_instance_st* self)
 304 {
 305   assert(self->root);
 306   if (self->root)
 307   {
 308     if (memcached_server_get_last_disconnect(self->root) and
 309         memcached_server_get_last_disconnect(self->root)->version == self->version)
 310     {
 311       return;
 312     }
 313
 314     // const_cast
 315     memcached_st *root= (memcached_st *)self->root;
 316
 317     memcached_instance_free((memcached_instance_st*)(root->last_disconnected_server));
 318
 319     // We set is_parsing so that no lookup happens
 320     root->state.is_parsing= true;
 321     root->last_disconnected_server= memcached_instance_clone(self);
 322     root->state.is_parsing= false;
 323
 324     ((memcached_instance_st*)memcached_server_get_last_disconnect(root))->version= self->version;
 325   }
 326 }
 327
 328 const memcached_instance_st * memcached_server_get_last_disconnect(const memcached_st *shell)
 329 {
 330   const Memcached* self= memcached2Memcached(shell);
 331   if (self)
 332   {
 333     return (const memcached_instance_st *)self->last_disconnected_server;
 334   }
 335
 336   return 0;
 337 }
 338
 339 void memcached_instance_next_retry(const memcached_instance_st * self, const time_t absolute_time)
 340 {
 341   WATCHPOINT_ASSERT(self);
 342   if (self)
 343   {
 344     ((memcached_instance_st*)self)->next_retry= absolute_time;
 345   }
 346 }
 347
 348 bool memcached_instance_st::valid() const
 349 {
 350   if (fd == INVALID_SOCKET)
 351   {
 352     return false;
 353   }
 354
 355   return true;
 356 }
 357
 358 bool memcached_instance_st::is_shutting_down() const
 359 {
 360   return options.is_shutting_down;
 361 }