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(org::libmemcached::Instance* self, memcached_st *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->cursor_active_= 0;
  48   self->port_= port;
  49   self->fd= INVALID_SOCKET;
  50   self->io_bytes_sent= 0;
  51   self->request_id= 0;
  52   self->server_failure_counter= 0;
  53   self->server_failure_counter_query_id= 0;
  54   self->weight= weight ? weight : 1; // 1 is the default weight value
  55   self->io_wait_count.read= 0;
  56   self->io_wait_count.write= 0;
  57   self->io_wait_count.timeouts= 0;
  58   self->io_wait_count._bytes_read= 0;
  59   self->major_version= UINT8_MAX;
  60   self->micro_version= UINT8_MAX;
  61   self->minor_version= UINT8_MAX;
  62   self->type= type;
  63   self->error_messages= NULL;
  64   self->read_ptr= self->read_buffer;
  65   self->read_buffer_length= 0;
  66   self->read_data_length= 0;
  67   self->write_buffer_offset= 0;
  68   self->address_info= NULL;
  69   self->address_info_next= NULL;
  70
  71   self->state= MEMCACHED_SERVER_STATE_NEW;
  72   self->next_retry= 0;
  73
  74   self->root= root;
  75   if (root)
  76   {
  77     self->version= ++root->server_info.version;
  78   }
  79   else
  80   {
  81     self->version= UINT_MAX;
  82   }
  83   self->limit_maxbytes= 0;
  84   memcpy(self->hostname, hostname.c_str, hostname.size);
  85   self->hostname[hostname.size]= 0;
  86 }
  87
  88 static org::libmemcached::Instance* _server_create(org::libmemcached::Instance* self, const memcached_st *memc)
  89 {
  90   if (self == NULL)
  91   {
  92    self= libmemcached_xmalloc(memc, org::libmemcached::Instance);
  93
  94     if (self == NULL)
  95     {
  96       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  97     }
  98
  99     self->options.is_allocated= true;
 100   }
 101   else
 102   {
 103     self->options.is_allocated= false;
 104   }
 105
 106   self->options.is_initialized= true;
 107
 108   return self;
 109 }
 110
 111 org::libmemcached::Instance* __instance_create_with(memcached_st *memc,
 112                                                     org::libmemcached::Instance* self,
 113                                                     const memcached_string_t& hostname,
 114                                                     const in_port_t port,
 115                                                     uint32_t weight,
 116                                                     const memcached_connection_t type)
 117 {
 118   if (memcached_is_valid_servername(hostname) == false)
 119   {
 120     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 121     return NULL;
 122   }
 123
 124   self= _server_create(self, memc);
 125
 126   if (self == NULL)
 127   {
 128     return NULL;
 129   }
 130
 131   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 132
 133   if (memc and memcached_is_udp(memc))
 134   {
 135     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 136     memcached_io_init_udp_header(self, 0);
 137   }
 138
 139   if (memc)
 140   {
 141     memcached_connect_try(self);
 142   }
 143
 144   return self;
 145 }
 146
 147 void __instance_free(org::libmemcached::Instance* self)
 148 {
 149   memcached_quit_server(self, false);
 150
 151   if (self->address_info)
 152   {
 153     freeaddrinfo(self->address_info);
 154     self->address_info= NULL;
 155     self->address_info_next= NULL;
 156   }
 157   assert(self->address_info_next == NULL);
 158
 159   memcached_error_free(*self);
 160
 161   if (memcached_is_allocated(self))
 162   {
 163     libmemcached_free(self->root, self);
 164   }
 165   else
 166   {
 167     self->options.is_initialized= false;
 168   }
 169 }
 170
 171 void memcached_instance_free(org::libmemcached::Instance* self)
 172 {
 173   if (self == NULL)
 174   {
 175     return;
 176   }
 177
 178   __instance_free(self);
 179 }
 180
 181 /*
 182   If we do not have a valid object to clone from, we toss an error.
 183 */
 184 memcached_server_st *memcached_instance_2_server(org::libmemcached::Instance* source)
 185 {
 186   /* We just do a normal create if source is missing */
 187   if (source == NULL)
 188   {
 189     return NULL;
 190   }
 191
 192   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 193   return __server_create_with(source->root, NULL,
 194                               hostname,
 195                               source->port(), source->weight,
 196                               source->type);
 197
 198 }
 199
 200 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 201                                            const memcached_server_fn *callback,
 202                                            void *context,
 203                                            uint32_t number_of_callbacks)
 204 {
 205   memcached_return_t rc;
 206   if (memcached_failed(rc= initialize_const_query(ptr)))
 207   {
 208     return rc;
 209   }
 210
 211   size_t errors= 0;
 212   for (uint32_t x= 0; x < memcached_instance_list_count(ptr); x++)
 213   {
 214     org::libmemcached::Instance* instance= memcached_instance_by_position(ptr, x);
 215
 216     for (uint32_t y= 0; y < number_of_callbacks; y++)
 217     {
 218       memcached_return_t ret= (*callback[y])(ptr, instance, context);
 219
 220       if (memcached_failed(ret))
 221       {
 222         errors++;
 223         continue;
 224       }
 225     }
 226   }
 227
 228   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 229 }
 230
 231 memcached_return_t memcached_server_execute(memcached_st *ptr,
 232                                             memcached_server_execute_fn callback,
 233                                             void *context)
 234 {
 235   if (callback == NULL)
 236   {
 237     return MEMCACHED_INVALID_ARGUMENTS;
 238   }
 239
 240   bool some_errors= false;;
 241   for (uint32_t x= 0; x < memcached_instance_list_count(ptr); x++)
 242   {
 243     org::libmemcached::Instance* instance= memcached_instance_fetch(ptr, x);
 244
 245     memcached_return_t rc= (*callback)(ptr, instance, context);
 246     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 247     {
 248       return rc;
 249     }
 250     else if (memcached_fatal(rc))
 251     {
 252       some_errors= true;
 253     }
 254   }
 255
 256   (void)some_errors;
 257   return MEMCACHED_SUCCESS;
 258 }
 259
 260 memcached_server_instance_st memcached_server_by_key(memcached_st *ptr,
 261                                                      const char *key,
 262                                                      size_t key_length,
 263                                                      memcached_return_t *error)
 264 {
 265   memcached_return_t unused;
 266   if (error == NULL)
 267   {
 268     error= &unused;
 269   }
 270
 271
 272   memcached_return_t rc;
 273   if (memcached_failed(rc= initialize_const_query(ptr)))
 274   {
 275     *error= rc;
 276     return NULL;
 277   }
 278
 279   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 280   {
 281     *error= memcached_last_error(ptr);
 282     return NULL;
 283   }
 284
 285   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 286   return memcached_instance_by_position(ptr, server_key);
 287 }
 288
 289 /*
 290   If we do not have a valid object to clone from, we toss an error.
 291 */
 292 static org::libmemcached::Instance* memcached_instance_clone(org::libmemcached::Instance* source)
 293 {
 294   /* We just do a normal create if source is missing */
 295   if (source == NULL)
 296   {
 297     return NULL;
 298   }
 299
 300   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 301   return __instance_create_with(source->root,
 302                                 NULL,
 303                                 hostname,
 304                                 source->port(), source->weight,
 305                                 source->type);
 306 }
 307
 308 void set_last_disconnected_host(org::libmemcached::Instance* self)
 309 {
 310   assert(self->root);
 311   if (self->root)
 312   {
 313     if (memcached_server_get_last_disconnect(self->root) and
 314         memcached_server_get_last_disconnect(self->root)->version == self->version)
 315     {
 316       return;
 317     }
 318
 319     // const_cast
 320     memcached_st *root= (memcached_st *)self->root;
 321
 322     memcached_instance_free((org::libmemcached::Instance*)(root->last_disconnected_server));
 323
 324     // We set is_parsing so that no lookup happens
 325     root->state.is_parsing= true;
 326     root->last_disconnected_server= memcached_instance_clone(self);
 327     root->state.is_parsing= false;
 328
 329     ((org::libmemcached::Instance*)memcached_server_get_last_disconnect(root))->version= self->version;
 330   }
 331 }
 332
 333 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 334 {
 335   WATCHPOINT_ASSERT(self);
 336   if (self == NULL)
 337   {
 338     return 0;
 339   }
 340
 341   return (memcached_server_instance_st)self->last_disconnected_server;
 342 }
 343
 344 const char *memcached_instance_name(const memcached_server_instance_st self)
 345 {
 346   WATCHPOINT_ASSERT(self);
 347   if (self == NULL)
 348     return NULL;
 349
 350   return self->hostname;
 351 }
 352
 353 in_port_t memcached_instance_port(const memcached_server_instance_st self)
 354 {
 355   WATCHPOINT_ASSERT(self);
 356   if (self == NULL)
 357   {
 358     return 0;
 359   }
 360
 361   return self->port();
 362 }
 363
 364 void memcached_instance_next_retry(memcached_server_instance_st self, const time_t absolute_time)
 365 {
 366   WATCHPOINT_ASSERT(self);
 367   if (self)
 368   {
 369     ((org::libmemcached::Instance*)self)->next_retry= absolute_time;
 370   }
 371 }
 372
 373 uint32_t memcached_instance_response_count(const org::libmemcached::Instance* self)
 374 {
 375   WATCHPOINT_ASSERT(self);
 376   if (self == NULL)
 377   {
 378     return 0;
 379   }
 380
 381   return self->cursor_active_;
 382 }