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(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)
 174   {
 175     __instance_free(self);
 176   }
 177 }
 178
 179 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 180                                            const memcached_server_fn *callback,
 181                                            void *context,
 182                                            uint32_t number_of_callbacks)
 183 {
 184   memcached_return_t rc;
 185   if (memcached_failed(rc= initialize_const_query(ptr)))
 186   {
 187     return rc;
 188   }
 189
 190   size_t errors= 0;
 191   for (uint32_t x= 0; x < memcached_instance_list_count(ptr); x++)
 192   {
 193     org::libmemcached::Instance* instance= memcached_instance_by_position(ptr, x);
 194
 195     for (uint32_t y= 0; y < number_of_callbacks; y++)
 196     {
 197       memcached_return_t ret= (*callback[y])(ptr, instance, context);
 198
 199       if (memcached_failed(ret))
 200       {
 201         errors++;
 202         continue;
 203       }
 204     }
 205   }
 206
 207   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 208 }
 209
 210 memcached_return_t memcached_server_execute(memcached_st *ptr,
 211                                             memcached_server_execute_fn callback,
 212                                             void *context)
 213 {
 214   if (callback == NULL)
 215   {
 216     return MEMCACHED_INVALID_ARGUMENTS;
 217   }
 218
 219   bool some_errors= false;;
 220   for (uint32_t x= 0; x < memcached_instance_list_count(ptr); x++)
 221   {
 222     org::libmemcached::Instance* instance= memcached_instance_fetch(ptr, x);
 223
 224     memcached_return_t rc= (*callback)(ptr, instance, context);
 225     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 226     {
 227       return rc;
 228     }
 229     else if (memcached_fatal(rc))
 230     {
 231       some_errors= true;
 232     }
 233   }
 234
 235   (void)some_errors;
 236   return MEMCACHED_SUCCESS;
 237 }
 238
 239 memcached_server_instance_st memcached_server_by_key(memcached_st *ptr,
 240                                                      const char *key,
 241                                                      size_t key_length,
 242                                                      memcached_return_t *error)
 243 {
 244   memcached_return_t unused;
 245   if (error == NULL)
 246   {
 247     error= &unused;
 248   }
 249
 250
 251   memcached_return_t rc;
 252   if (memcached_failed(rc= initialize_const_query(ptr)))
 253   {
 254     *error= rc;
 255     return NULL;
 256   }
 257
 258   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 259   {
 260     *error= memcached_last_error(ptr);
 261     return NULL;
 262   }
 263
 264   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 265   return memcached_instance_by_position(ptr, server_key);
 266 }
 267
 268 /*
 269   If we do not have a valid object to clone from, we toss an error.
 270 */
 271 static org::libmemcached::Instance* memcached_instance_clone(org::libmemcached::Instance* source)
 272 {
 273   /* We just do a normal create if source is missing */
 274   if (source == NULL)
 275   {
 276     return NULL;
 277   }
 278
 279   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 280   return __instance_create_with(source->root,
 281                                 NULL,
 282                                 hostname,
 283                                 source->port(), source->weight,
 284                                 source->type);
 285 }
 286
 287 void set_last_disconnected_host(org::libmemcached::Instance* self)
 288 {
 289   assert(self->root);
 290   if (self->root)
 291   {
 292     if (memcached_server_get_last_disconnect(self->root) and
 293         memcached_server_get_last_disconnect(self->root)->version == self->version)
 294     {
 295       return;
 296     }
 297
 298     // const_cast
 299     memcached_st *root= (memcached_st *)self->root;
 300
 301     memcached_instance_free((org::libmemcached::Instance*)(root->last_disconnected_server));
 302
 303     // We set is_parsing so that no lookup happens
 304     root->state.is_parsing= true;
 305     root->last_disconnected_server= memcached_instance_clone(self);
 306     root->state.is_parsing= false;
 307
 308     ((org::libmemcached::Instance*)memcached_server_get_last_disconnect(root))->version= self->version;
 309   }
 310 }
 311
 312 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 313 {
 314   WATCHPOINT_ASSERT(self);
 315   if (self == NULL)
 316   {
 317     return 0;
 318   }
 319
 320   return (memcached_server_instance_st)self->last_disconnected_server;
 321 }
 322
 323 void memcached_instance_next_retry(memcached_server_instance_st self, const time_t absolute_time)
 324 {
 325   WATCHPOINT_ASSERT(self);
 326   if (self)
 327   {
 328     ((org::libmemcached::Instance*)self)->next_retry= absolute_time;
 329   }
 330 }