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,
  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 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->read_data_length= 0;
  72   self->write_buffer_offset= 0;
  73   self->address_info= NULL;
  74   self->address_info_next= NULL;
  75
  76   self->state= MEMCACHED_SERVER_STATE_NEW;
  77   self->next_retry= 0;
  78
  79   self->root= root;
  80   if (root)
  81   {
  82     self->version= ++root->server_info.version;
  83   }
  84   else
  85   {
  86     self->version= UINT_MAX;
  87   }
  88   self->limit_maxbytes= 0;
  89   self->hostname(hostname);
  90 }
  91
  92 static memcached_instance_st* _server_create(memcached_instance_st* self, const memcached_st *memc)
  93 {
  94   if (self == NULL)
  95   {
  96    self= libmemcached_xmalloc(memc, memcached_instance_st);
  97
  98     if (self == NULL)
  99     {
 100       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 101     }
 102
 103     self->options.is_allocated= true;
 104   }
 105   else
 106   {
 107     self->options.is_allocated= false;
 108   }
 109
 110   self->options.is_initialized= true;
 111
 112   return self;
 113 }
 114
 115 void memcached_instance_st::events(short arg)
 116 {
 117   if ((_events | arg) == _events)
 118   {
 119     return;
 120   }
 121
 122   _events|= arg;
 123 }
 124
 125 void memcached_instance_st::revents(short arg)
 126 {
 127   if (arg)
 128   {
 129     options.ready= true;
 130   }
 131
 132   _revents= arg;
 133   _events&= short(~arg);
 134 }
 135
 136 memcached_instance_st* __instance_create_with(memcached_st *memc,
 137                                                     memcached_instance_st* self,
 138                                                     const memcached_string_t& hostname,
 139                                                     const in_port_t port,
 140                                                     uint32_t weight,
 141                                                     const memcached_connection_t type)
 142 {
 143   if (memcached_is_valid_servername(hostname) == false)
 144   {
 145     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 146     return NULL;
 147   }
 148
 149   self= _server_create(self, memc);
 150
 151   if (self == NULL)
 152   {
 153     return NULL;
 154   }
 155
 156   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 157
 158   if (memc and memcached_is_udp(memc))
 159   {
 160     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 161     memcached_io_init_udp_header(self, 0);
 162   }
 163
 164   return self;
 165 }
 166
 167 void __instance_free(memcached_instance_st* self)
 168 {
 169   memcached_quit_server(self, false);
 170
 171   self->clear_addrinfo();
 172   assert(self->address_info_next == NULL);
 173
 174   memcached_error_free(*self);
 175
 176   if (memcached_is_allocated(self))
 177   {
 178     libmemcached_free(self->root, self);
 179   }
 180   else
 181   {
 182     self->options.is_initialized= false;
 183   }
 184 }
 185
 186 void memcached_instance_free(memcached_instance_st* self)
 187 {
 188   if (self)
 189   {
 190     __instance_free(self);
 191   }
 192 }
 193
 194 memcached_return_t memcached_server_cursor(const memcached_st* shell,
 195                                            const memcached_server_fn *callback,
 196                                            void *context,
 197                                            uint32_t number_of_callbacks)
 198 {
 199   const Memcached* memc= memcached2Memcached(shell);
 200   memcached_return_t rc;
 201   if (memcached_failed(rc= initialize_const_query(memc)))
 202   {
 203     return rc;
 204   }
 205
 206   size_t errors= 0;
 207   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 208   {
 209     memcached_instance_st* instance= memcached_instance_by_position(memc, x);
 210
 211     for (uint32_t y= 0; y < number_of_callbacks; y++)
 212     {
 213       memcached_return_t ret= (*callback[y])(memc, instance, context);
 214
 215       if (memcached_failed(ret))
 216       {
 217         errors++;
 218         continue;
 219       }
 220     }
 221   }
 222
 223   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 224 }
 225
 226 memcached_return_t memcached_server_execute(memcached_st *memc,
 227                                             memcached_server_execute_fn callback,
 228                                             void *context)
 229 {
 230   if (callback == NULL)
 231   {
 232     return MEMCACHED_INVALID_ARGUMENTS;
 233   }
 234
 235   bool some_errors= false;;
 236   for (uint32_t x= 0; x < memcached_instance_list_count(memc); x++)
 237   {
 238     memcached_instance_st* instance= memcached_instance_fetch(memc, x);
 239
 240     memcached_return_t rc= (*callback)(memc, instance, context);
 241     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 242     {
 243       return rc;
 244     }
 245     else if (memcached_fatal(rc))
 246     {
 247       some_errors= true;
 248     }
 249   }
 250
 251   (void)some_errors;
 252   return MEMCACHED_SUCCESS;
 253 }
 254
 255 const memcached_instance_st * memcached_server_by_key(memcached_st *shell,
 256                                                      const char *key,
 257                                                      size_t key_length,
 258                                                      memcached_return_t *error)
 259 {
 260   Memcached* memc= memcached2Memcached(shell);
 261   memcached_return_t unused;
 262   if (error == NULL)
 263   {
 264     error= &unused;
 265   }
 266
 267
 268   memcached_return_t rc;
 269   if (memcached_failed(rc= initialize_const_query(memc)))
 270   {
 271     *error= rc;
 272     return NULL;
 273   }
 274
 275   if (memcached_failed((memcached_key_test(*memc, (const char **)&key, &key_length, 1))))
 276   {
 277     *error= memcached_last_error(memc);
 278     return NULL;
 279   }
 280
 281   uint32_t server_key= memcached_generate_hash(memc, key, key_length);
 282   return memcached_instance_by_position(memc, server_key);
 283 }
 284
 285 /*
 286   If we do not have a valid object to clone from, we toss an error.
 287 */
 288 static memcached_instance_st* memcached_instance_clone(memcached_instance_st* source)
 289 {
 290   /* We just do a normal create if source is missing */
 291   if (source == NULL)
 292   {
 293     return NULL;
 294   }
 295
 296   memcached_string_t hostname_= { memcached_string_make_from_cstr(source->hostname()) };
 297   return __instance_create_with(source->root,
 298                                 NULL,
 299                                 hostname_,
 300                                 source->port(), source->weight,
 301                                 source->type);
 302 }
 303
 304 void set_last_disconnected_host(memcached_instance_st* self)
 305 {
 306   assert(self->root);
 307   if (self->root)
 308   {
 309     if (memcached_server_get_last_disconnect(self->root) and
 310         memcached_server_get_last_disconnect(self->root)->version == self->version)
 311     {
 312       return;
 313     }
 314
 315     // const_cast
 316     memcached_st *root= (memcached_st *)self->root;
 317
 318     memcached_instance_free((memcached_instance_st*)(root->last_disconnected_server));
 319
 320     // We set is_parsing so that no lookup happens
 321     root->state.is_parsing= true;
 322     root->last_disconnected_server= memcached_instance_clone(self);
 323     root->state.is_parsing= false;
 324
 325     ((memcached_instance_st*)memcached_server_get_last_disconnect(root))->version= self->version;
 326   }
 327 }
 328
 329 const memcached_instance_st * memcached_server_get_last_disconnect(const memcached_st *shell)
 330 {
 331   const Memcached* self= memcached2Memcached(shell);
 332   if (self)
 333   {
 334     return (const memcached_instance_st *)self->last_disconnected_server;
 335   }
 336
 337   return 0;
 338 }
 339
 340 void memcached_instance_next_retry(const memcached_instance_st * self, const time_t absolute_time)
 341 {
 342   WATCHPOINT_ASSERT(self);
 343   if (self)
 344   {
 345     ((memcached_instance_st*)self)->next_retry= absolute_time;
 346   }
 347 }
 348
 349 bool memcached_instance_st::valid() const
 350 {
 351   if (fd == INVALID_SOCKET)
 352   {
 353     return false;
 354   }
 355
 356   return true;
 357 }
 358
 359 bool memcached_instance_st::is_shutting_down() const
 360 {
 361   return options.is_shutting_down;
 362 }