git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/server.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,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  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 /*
  39   This is a partial implementation for fetching/creating memcached_server_st objects.
  40 */
  41 #include <libmemcached/common.h>
  42
  43 static inline void _server_init(memcached_server_st *self, memcached_st *root,
  44                                 const char *hostname, in_port_t port,
  45                                 uint32_t weight, memcached_connection_t type)
  46 {
  47   self->options.is_shutting_down= false;
  48   self->options.is_dead= false;
  49   self->number_of_hosts= 0;
  50   self->cursor_active= 0;
  51   self->port= port;
  52   self->fd= -1;
  53   self->io_bytes_sent= 0;
  54   self->server_failure_counter= 0;
  55   self->weight= weight ? weight : 1; // 1 is the default weight value
  56   WATCHPOINT_SET(self->io_wait_count.read= 0);
  57   WATCHPOINT_SET(self->io_wait_count.write= 0);
  58   self->major_version= UINT8_MAX;
  59   self->micro_version= UINT8_MAX;
  60   self->minor_version= UINT8_MAX;
  61   self->type= type;
  62   self->error_messages= NULL;
  63   self->read_ptr= self->read_buffer;
  64   self->read_buffer_length= 0;
  65   self->read_data_length= 0;
  66   self->write_buffer_offset= 0;
  67   self->address_info= NULL;
  68   self->address_info_next= NULL;
  69
  70   self->state= MEMCACHED_SERVER_STATE_NEW;
  71
  72   if (root)
  73   {
  74     self->next_retry= root->retry_timeout;
  75   }
  76   else
  77   {
  78     self->next_retry= 0;
  79   }
  80
  81   self->root= root;
  82   self->limit_maxbytes= 0;
  83   if (hostname)
  84   {
  85     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  86   }
  87   else
  88   {
  89     self->hostname[0]= 0;
  90   }
  91 }
  92
  93 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  94 {
  95   if (not self)
  96   {
  97    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  98
  99     if (not self)
 100       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 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 memcached_server_st *__server_create_with(const memcached_st *memc,
 115                                           memcached_server_write_instance_st self,
 116                                           const char *hostname, in_port_t port,
 117                                           uint32_t weight, memcached_connection_t type)
 118 {
 119   self= _server_create(self, memc);
 120
 121   if (not self)
 122   {
 123     return NULL;
 124   }
 125
 126   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 127
 128
 129   if (type == MEMCACHED_CONNECTION_UDP)
 130   {
 131     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 132     memcached_io_init_udp_header(self, 0);
 133   }
 134
 135   return self;
 136 }
 137
 138 void __server_free(memcached_server_st *self)
 139 {
 140   memcached_quit_server(self, false);
 141
 142   if (self->address_info)
 143   {
 144     freeaddrinfo(self->address_info);
 145     self->address_info= NULL;
 146   }
 147
 148   memcached_error_free(*self);
 149
 150   if (memcached_is_allocated(self))
 151   {
 152     libmemcached_free(self->root, self);
 153   }
 154   else
 155   {
 156     self->options.is_initialized= false;
 157   }
 158 }
 159
 160 void memcached_server_free(memcached_server_st *self)
 161 {
 162   if (not self)
 163     return;
 164
 165   if (memcached_server_list_count(self))
 166   {
 167     memcached_server_list_free(self);
 168     return;
 169   }
 170
 171   __server_free(self);
 172 }
 173
 174 /*
 175   If we do not have a valid object to clone from, we toss an error.
 176 */
 177 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 178                                             const memcached_server_st *source)
 179 {
 180   /* We just do a normal create if source is missing */
 181   if (not source)
 182     return NULL;
 183
 184   destination= __server_create_with(source->root, destination,
 185                                     source->hostname, source->port, source->weight,
 186                                     source->type);
 187   if (not destination)
 188   {
 189     if (source->error_messages)
 190     {
 191       destination->error_messages= memcached_error_copy(*source);
 192     }
 193   }
 194
 195   return destination;
 196
 197 }
 198
 199 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 200                                            const memcached_server_fn *callback,
 201                                            void *context,
 202                                            uint32_t number_of_callbacks)
 203 {
 204   memcached_return_t rc;
 205   if (memcached_failed(rc= initialize_const_query(ptr)))
 206   {
 207     return rc;
 208   }
 209
 210   size_t errors= 0;
 211   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 212   {
 213     memcached_server_instance_st instance=
 214       memcached_server_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   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 236   {
 237     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 238
 239     unsigned int iferror= (*callback)(ptr, instance, context);
 240
 241     if (iferror)
 242     {
 243       continue;
 244     }
 245   }
 246
 247   return MEMCACHED_SUCCESS;
 248 }
 249
 250 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 251                                                      const char *key,
 252                                                      size_t key_length,
 253                                                      memcached_return_t *error)
 254 {
 255   memcached_return_t rc;
 256   memcached_return_t unused;
 257
 258   if (not error)
 259     error= &unused;
 260
 261   if (memcached_failed(rc= initialize_const_query(ptr)))
 262   {
 263     *error= rc;
 264     return NULL;
 265   }
 266
 267   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 268   {
 269     *error= rc;
 270     return NULL;
 271   }
 272
 273   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 274   {
 275     *error= MEMCACHED_BAD_KEY_PROVIDED;
 276     return NULL;
 277   }
 278
 279   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 280   return memcached_server_instance_by_position(ptr, server_key);
 281
 282 }
 283
 284 void memcached_server_error_reset(memcached_server_st *self)
 285 {
 286   WATCHPOINT_ASSERT(self);
 287   if (not self)
 288   {
 289     return;
 290   }
 291
 292   memcached_error_free(*self);
 293 }
 294
 295 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 296 {
 297   WATCHPOINT_ASSERT(self);
 298   if (not self)
 299     return 0;
 300
 301   return self->last_disconnected_server;
 302 }
 303
 304 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 305 {
 306   WATCHPOINT_ASSERT(servers);
 307   if (not servers)
 308     return 0;
 309
 310   return servers->number_of_hosts= count;
 311 }
 312
 313 uint32_t memcached_server_count(const memcached_st *self)
 314 {
 315   WATCHPOINT_ASSERT(self);
 316   if (not self)
 317     return 0;
 318
 319   return self->number_of_hosts;
 320 }
 321
 322 const char *memcached_server_name(const memcached_server_instance_st self)
 323 {
 324   WATCHPOINT_ASSERT(self);
 325   if (not self)
 326     return NULL;
 327
 328   return self->hostname;
 329 }
 330
 331 in_port_t memcached_server_port(const memcached_server_instance_st self)
 332 {
 333   WATCHPOINT_ASSERT(self);
 334   if (not self)
 335     return 0;
 336
 337   return self->port;
 338 }
 339
 340 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 341 {
 342   WATCHPOINT_ASSERT(self);
 343   if (not self)
 344     return 0;
 345
 346   return self->cursor_active;
 347 }
 348
 349 const char *memcached_server_type(const memcached_server_instance_st ptr)
 350 {
 351   if (ptr)
 352   {
 353     switch (ptr->type)
 354     {
 355     case MEMCACHED_CONNECTION_TCP:
 356       return "TCP";
 357
 358     case MEMCACHED_CONNECTION_UDP:
 359       return "UDP";
 360
 361     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 362       return "SOCKET";
 363     }
 364   }
 365
 366   return "UNKNOWN";
 367 }