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->fd= -1;
  54   self->io_bytes_sent= 0;
  55   self->server_failure_counter= 0;
  56   self->weight= weight ? weight : 1; // 1 is the default weight value
  57   WATCHPOINT_SET(self->io_wait_count.read= 0);
  58   WATCHPOINT_SET(self->io_wait_count.write= 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
  73   if (root)
  74   {
  75     self->next_retry= root->retry_timeout;
  76   }
  77   else
  78   {
  79     self->next_retry= 0;
  80   }
  81
  82   self->root= root;
  83   self->limit_maxbytes= 0;
  84   if (hostname)
  85   {
  86     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  87   }
  88   else
  89   {
  90     self->hostname[0]= 0;
  91   }
  92 }
  93
  94 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  95 {
  96   if (not self)
  97   {
  98    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  99
 100     if (not self)
 101       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 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 memcached_server_st *__server_create_with(const memcached_st *memc,
 116                                           memcached_server_write_instance_st self,
 117                                           const char *hostname, in_port_t port,
 118                                           uint32_t weight, memcached_connection_t type)
 119 {
 120   self= _server_create(self, memc);
 121
 122   if (not self)
 123     return NULL;
 124
 125   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 126
 127
 128   if (type == MEMCACHED_CONNECTION_UDP)
 129   {
 130     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 131     memcached_io_init_udp_header(self, 0);
 132   }
 133
 134   return self;
 135 }
 136
 137 void __server_free(memcached_server_st *self)
 138 {
 139   memcached_quit_server(self, false);
 140
 141   if (self->address_info)
 142   {
 143     freeaddrinfo(self->address_info);
 144   }
 145
 146   memcached_error_free(*self);
 147
 148   if (memcached_is_allocated(self))
 149   {
 150     libmemcached_free(self->root, self);
 151   }
 152   else
 153   {
 154     self->options.is_initialized= false;
 155   }
 156 }
 157
 158 void memcached_server_free(memcached_server_st *self)
 159 {
 160   if (not self)
 161     return;
 162
 163   if (memcached_server_list_count(self))
 164   {
 165     memcached_server_list_free(self);
 166     return;
 167   }
 168
 169   __server_free(self);
 170 }
 171
 172 /*
 173   If we do not have a valid object to clone from, we toss an error.
 174 */
 175 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 176                                             const memcached_server_st *source)
 177 {
 178   /* We just do a normal create if source is missing */
 179   if (not source)
 180     return NULL;
 181
 182   destination= __server_create_with(source->root, destination,
 183                                     source->hostname, source->port, source->weight,
 184                                     source->type);
 185   if (not destination)
 186   {
 187     if (source->error_messages)
 188     {
 189       destination->error_messages= memcached_error_copy(*source);
 190     }
 191   }
 192
 193   return destination;
 194
 195 }
 196
 197 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 198                                            const memcached_server_fn *callback,
 199                                            void *context,
 200                                            uint32_t number_of_callbacks)
 201 {
 202   memcached_return_t rc;
 203   if (memcached_failed(rc= initialize_const_query(ptr)))
 204   {
 205     return rc;
 206   }
 207
 208   size_t errors= 0;
 209   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 210   {
 211     memcached_server_instance_st instance=
 212       memcached_server_instance_by_position(ptr, x);
 213
 214     for (uint32_t y= 0; y < number_of_callbacks; y++)
 215     {
 216       memcached_return_t ret= (*callback[y])(ptr, instance, context);
 217
 218       if (memcached_failed(ret))
 219       {
 220         errors++;
 221         continue;
 222       }
 223     }
 224   }
 225
 226   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 227 }
 228
 229 memcached_return_t memcached_server_execute(memcached_st *ptr,
 230                                             memcached_server_execute_fn callback,
 231                                             void *context)
 232 {
 233   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 234   {
 235     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 236
 237     unsigned int iferror= (*callback)(ptr, instance, context);
 238
 239     if (iferror)
 240       continue;
 241   }
 242
 243   return MEMCACHED_SUCCESS;
 244 }
 245
 246 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 247                                                      const char *key,
 248                                                      size_t key_length,
 249                                                      memcached_return_t *error)
 250 {
 251   memcached_return_t rc;
 252   memcached_return_t unused;
 253
 254   if (not error)
 255     error= &unused;
 256
 257   if (memcached_failed(rc= initialize_const_query(ptr)))
 258   {
 259     *error= rc;
 260     return NULL;
 261   }
 262
 263   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 264   {
 265     *error= rc;
 266     return NULL;
 267   }
 268
 269   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 270   {
 271     *error= MEMCACHED_BAD_KEY_PROVIDED;
 272     return NULL;
 273   }
 274
 275   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 276   return memcached_server_instance_by_position(ptr, server_key);
 277
 278 }
 279
 280 void memcached_server_error_reset(memcached_server_st *self)
 281 {
 282   WATCHPOINT_ASSERT(self);
 283   if (not self)
 284     return;
 285
 286   memcached_error_free(*self);
 287 }
 288
 289 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 290 {
 291   WATCHPOINT_ASSERT(self);
 292   if (not self)
 293     return 0;
 294
 295   return self->last_disconnected_server;
 296 }
 297
 298 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 299 {
 300   WATCHPOINT_ASSERT(servers);
 301   if (not servers)
 302     return 0;
 303
 304   return servers->number_of_hosts= count;
 305 }
 306
 307 uint32_t memcached_server_count(const memcached_st *self)
 308 {
 309   WATCHPOINT_ASSERT(self);
 310   if (not self)
 311     return 0;
 312
 313   return self->number_of_hosts;
 314 }
 315
 316 const char *memcached_server_name(const memcached_server_instance_st self)
 317 {
 318   WATCHPOINT_ASSERT(self);
 319   if (not self)
 320     return NULL;
 321
 322   return self->hostname;
 323 }
 324
 325 in_port_t memcached_server_port(const memcached_server_instance_st self)
 326 {
 327   WATCHPOINT_ASSERT(self);
 328   if (not self)
 329     return 0;
 330
 331   return self->port;
 332 }
 333
 334 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 335 {
 336   WATCHPOINT_ASSERT(self);
 337   if (not self)
 338     return 0;
 339
 340   return self->cursor_active;
 341 }
 342
 343 const char *memcached_server_type(const memcached_server_instance_st ptr)
 344 {
 345   if (ptr)
 346   {
 347     switch (ptr->type)
 348     {
 349     case MEMCACHED_CONNECTION_TCP:
 350       return "TCP";
 351
 352     case MEMCACHED_CONNECTION_UDP:
 353       return "UDP";
 354
 355     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 356       return "SOCKET";
 357
 358     case MEMCACHED_CONNECTION_MAX:
 359     case MEMCACHED_CONNECTION_UNKNOWN:
 360       break;
 361     }
 362   }
 363
 364   return "UNKNOWN";
 365 }