git.m6w6.name Git - m6w6/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 #include <cassert>
  43
  44 static inline void _server_init(memcached_server_st *self, memcached_st *root,
  45                                 const char *hostname, in_port_t port,
  46                                 uint32_t weight, memcached_connection_t type)
  47 {
  48   self->options.is_shutting_down= false;
  49   self->options.is_dead= false;
  50   self->number_of_hosts= 0;
  51   self->cursor_active= 0;
  52   self->port= port;
  53   self->cached_errno= 0;
  54   self->fd= -1;
  55   self->io_bytes_sent= 0;
  56   self->server_failure_counter= 0;
  57   self->weight= weight ? weight : 1; // 1 is the default weight value
  58   WATCHPOINT_SET(self->io_wait_count.read= 0);
  59   WATCHPOINT_SET(self->io_wait_count.write= 0);
  60   self->major_version= UINT8_MAX;
  61   self->micro_version= UINT8_MAX;
  62   self->minor_version= UINT8_MAX;
  63   self->type= type;
  64   self->read_ptr= self->read_buffer;
  65   self->cached_server_error= NULL;
  66   self->read_buffer_length= 0;
  67   self->read_data_length= 0;
  68   self->write_buffer_offset= 0;
  69   self->address_info= NULL;
  70   self->address_info_next= NULL;
  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 == NULL)
  84   {
  85     self->hostname[0]= 0;
  86   }
  87   else
  88   {
  89     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  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 *memcached_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     return NULL;
 123
 124   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 125
 126
 127   if (type == MEMCACHED_CONNECTION_UDP)
 128   {
 129     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 130     memcached_io_init_udp_header(self, 0);
 131   }
 132
 133   return self;
 134 }
 135
 136 void memcached_server_free(memcached_server_st *self)
 137 {
 138   if (not self)
 139     return;
 140
 141   memcached_quit_server(self, false);
 142
 143   if (self->cached_server_error)
 144     free(self->cached_server_error);
 145
 146   if (self->address_info)
 147     freeaddrinfo(self->address_info);
 148
 149   if (memcached_is_allocated(self))
 150   {
 151     libmemcached_free(self->root, self);
 152   }
 153   else
 154   {
 155     self->options.is_initialized= false;
 156   }
 157 }
 158
 159 /*
 160   If we do not have a valid object to clone from, we toss an error.
 161 */
 162 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 163                                             const memcached_server_st *source)
 164 {
 165   /* We just do a normal create if source is missing */
 166   if (not source)
 167     return NULL;
 168
 169   destination= memcached_server_create_with(source->root, destination,
 170                                             source->hostname, source->port, source->weight,
 171                                             source->type);
 172   if (not destination)
 173   {
 174     destination->cached_errno= source->cached_errno;
 175
 176     if (source->cached_server_error)
 177       destination->cached_server_error= strdup(source->cached_server_error);
 178   }
 179
 180   return destination;
 181
 182 }
 183
 184 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 185                                            const memcached_server_fn *callback,
 186                                            void *context,
 187                                            uint32_t number_of_callbacks)
 188 {
 189   memcached_return_t rc;
 190   if (memcached_failed(rc= initialize_const_query(ptr)))
 191   {
 192     return rc;
 193   }
 194
 195   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 196   {
 197     memcached_server_instance_st instance=
 198       memcached_server_instance_by_position(ptr, x);
 199
 200     for (uint32_t y= 0; y < number_of_callbacks; y++)
 201     {
 202       unsigned int iferror;
 203
 204       iferror= (*callback[y])(ptr, instance, context);
 205
 206       if (iferror)
 207         continue;
 208     }
 209   }
 210
 211   return MEMCACHED_SUCCESS;
 212 }
 213
 214 memcached_return_t memcached_server_execute(memcached_st *ptr,
 215                                             memcached_server_execute_fn callback,
 216                                             void *context)
 217 {
 218   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 219   {
 220     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 221
 222     unsigned int iferror= (*callback)(ptr, instance, context);
 223
 224     if (iferror)
 225       continue;
 226   }
 227
 228   return MEMCACHED_SUCCESS;
 229 }
 230
 231 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 232                                                      const char *key,
 233                                                      size_t key_length,
 234                                                      memcached_return_t *error)
 235 {
 236   memcached_return_t rc;
 237   memcached_return_t unused;
 238
 239   if (not error)
 240     error= &unused;
 241
 242   if (memcached_failed(rc= initialize_const_query(ptr)))
 243   {
 244     *error= rc;
 245     return NULL;
 246   }
 247
 248   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 249   {
 250     *error= rc;
 251     return NULL;
 252   }
 253
 254   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 255   {
 256     *error= MEMCACHED_BAD_KEY_PROVIDED;
 257     return NULL;
 258   }
 259
 260   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 261   return memcached_server_instance_by_position(ptr, server_key);
 262
 263 }
 264
 265 void memcached_server_error_reset(memcached_server_st *self)
 266 {
 267   WATCHPOINT_ASSERT(self);
 268   if (not self)
 269     return;
 270
 271   self->cached_server_error[0]= 0;
 272 }
 273
 274 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 275 {
 276   WATCHPOINT_ASSERT(self);
 277   if (not self)
 278     return 0;
 279
 280   return self->last_disconnected_server;
 281 }
 282
 283 void memcached_server_list_free(memcached_server_list_st self)
 284 {
 285   if (not self)
 286     return;
 287
 288   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 289   {
 290     if (self[x].address_info)
 291     {
 292       freeaddrinfo(self[x].address_info);
 293       self[x].address_info= NULL;
 294     }
 295   }
 296
 297   memcached_st *root= self->root;
 298   libmemcached_free(root, self);
 299 }
 300
 301 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 302 {
 303   WATCHPOINT_ASSERT(servers);
 304   if (not servers)
 305     return 0;
 306
 307   return servers->number_of_hosts= count;
 308 }
 309
 310 uint32_t memcached_server_count(const memcached_st *self)
 311 {
 312   WATCHPOINT_ASSERT(self);
 313   if (not self)
 314     return 0;
 315
 316   return self->number_of_hosts;
 317 }
 318
 319 const char *memcached_server_name(memcached_server_instance_st self)
 320 {
 321   WATCHPOINT_ASSERT(self);
 322   if (not self)
 323     return NULL;
 324
 325   return self->hostname;
 326 }
 327
 328 in_port_t memcached_server_port(memcached_server_instance_st self)
 329 {
 330   WATCHPOINT_ASSERT(self);
 331   if (not self)
 332     return 0;
 333
 334   return self->port;
 335 }
 336
 337 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 338 {
 339   WATCHPOINT_ASSERT(self);
 340   if (not self)
 341     return 0;
 342
 343   return self->cursor_active;
 344 }
 345
 346 const char *memcached_server_error(memcached_server_instance_st ptr)
 347 {
 348   return ptr ?  ptr->cached_server_error : NULL;
 349 }
 350