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 #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   self->state= MEMCACHED_SERVER_STATE_NEW;
  73
  74   if (root)
  75   {
  76     self->next_retry= root->retry_timeout;
  77   }
  78   else
  79   {
  80     self->next_retry= 0;
  81   }
  82
  83   self->root= root;
  84   self->limit_maxbytes= 0;
  85   if (hostname)
  86   {
  87     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  88   }
  89   else
  90   {
  91     self->hostname[0]= 0;
  92   }
  93 }
  94
  95 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  96 {
  97   if (not self)
  98   {
  99    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
 100
 101     if (not self)
 102       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 103
 104     self->options.is_allocated= true;
 105   }
 106   else
 107   {
 108     self->options.is_allocated= false;
 109   }
 110
 111   self->options.is_initialized= true;
 112
 113   return self;
 114 }
 115
 116 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
 117                                                   memcached_server_write_instance_st self,
 118                                                   const char *hostname, in_port_t port,
 119                                                   uint32_t weight, memcached_connection_t type)
 120 {
 121   self= _server_create(self, memc);
 122
 123   if (not self)
 124     return NULL;
 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 memcached_server_free(memcached_server_st *self)
 139 {
 140   if (not self)
 141     return;
 142
 143   memcached_quit_server(self, false);
 144
 145   if (self->cached_server_error)
 146     free(self->cached_server_error);
 147
 148   if (self->address_info)
 149     freeaddrinfo(self->address_info);
 150
 151   if (memcached_is_allocated(self))
 152   {
 153     libmemcached_free(self->root, self);
 154   }
 155   else
 156   {
 157     self->options.is_initialized= false;
 158   }
 159 }
 160
 161 /*
 162   If we do not have a valid object to clone from, we toss an error.
 163 */
 164 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 165                                             const memcached_server_st *source)
 166 {
 167   /* We just do a normal create if source is missing */
 168   if (not source)
 169     return NULL;
 170
 171   destination= memcached_server_create_with(source->root, destination,
 172                                             source->hostname, source->port, source->weight,
 173                                             source->type);
 174   if (not destination)
 175   {
 176     destination->cached_errno= source->cached_errno;
 177
 178     if (source->cached_server_error)
 179       destination->cached_server_error= strdup(source->cached_server_error);
 180   }
 181
 182   return destination;
 183
 184 }
 185
 186 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 187                                            const memcached_server_fn *callback,
 188                                            void *context,
 189                                            uint32_t number_of_callbacks)
 190 {
 191   memcached_return_t rc;
 192   if (memcached_failed(rc= initialize_const_query(ptr)))
 193   {
 194     return rc;
 195   }
 196
 197   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 198   {
 199     memcached_server_instance_st instance=
 200       memcached_server_instance_by_position(ptr, x);
 201
 202     for (uint32_t y= 0; y < number_of_callbacks; y++)
 203     {
 204       unsigned int iferror;
 205
 206       iferror= (*callback[y])(ptr, instance, context);
 207
 208       if (iferror)
 209         continue;
 210     }
 211   }
 212
 213   return MEMCACHED_SUCCESS;
 214 }
 215
 216 memcached_return_t memcached_server_execute(memcached_st *ptr,
 217                                             memcached_server_execute_fn callback,
 218                                             void *context)
 219 {
 220   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 221   {
 222     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 223
 224     unsigned int iferror= (*callback)(ptr, instance, context);
 225
 226     if (iferror)
 227       continue;
 228   }
 229
 230   return MEMCACHED_SUCCESS;
 231 }
 232
 233 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 234                                                      const char *key,
 235                                                      size_t key_length,
 236                                                      memcached_return_t *error)
 237 {
 238   memcached_return_t rc;
 239   memcached_return_t unused;
 240
 241   if (not error)
 242     error= &unused;
 243
 244   if (memcached_failed(rc= initialize_const_query(ptr)))
 245   {
 246     *error= rc;
 247     return NULL;
 248   }
 249
 250   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 251   {
 252     *error= rc;
 253     return NULL;
 254   }
 255
 256   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 257   {
 258     *error= MEMCACHED_BAD_KEY_PROVIDED;
 259     return NULL;
 260   }
 261
 262   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 263   return memcached_server_instance_by_position(ptr, server_key);
 264
 265 }
 266
 267 void memcached_server_error_reset(memcached_server_st *self)
 268 {
 269   WATCHPOINT_ASSERT(self);
 270   if (not self)
 271     return;
 272
 273   self->cached_server_error[0]= 0;
 274 }
 275
 276 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 277 {
 278   WATCHPOINT_ASSERT(self);
 279   if (not self)
 280     return 0;
 281
 282   return self->last_disconnected_server;
 283 }
 284
 285 void memcached_server_list_free(memcached_server_list_st self)
 286 {
 287   if (not self)
 288     return;
 289
 290   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 291   {
 292     if (self[x].address_info)
 293     {
 294       freeaddrinfo(self[x].address_info);
 295       self[x].address_info= NULL;
 296     }
 297   }
 298
 299   libmemcached_free(self->root, self);
 300 }
 301
 302 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 303 {
 304   WATCHPOINT_ASSERT(servers);
 305   if (not servers)
 306     return 0;
 307
 308   return servers->number_of_hosts= count;
 309 }
 310
 311 uint32_t memcached_server_count(const memcached_st *self)
 312 {
 313   WATCHPOINT_ASSERT(self);
 314   if (not self)
 315     return 0;
 316
 317   return self->number_of_hosts;
 318 }
 319
 320 const char *memcached_server_name(memcached_server_instance_st self)
 321 {
 322   WATCHPOINT_ASSERT(self);
 323   if (not self)
 324     return NULL;
 325
 326   return self->hostname;
 327 }
 328
 329 in_port_t memcached_server_port(memcached_server_instance_st self)
 330 {
 331   WATCHPOINT_ASSERT(self);
 332   if (not self)
 333     return 0;
 334
 335   return self->port;
 336 }
 337
 338 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 339 {
 340   WATCHPOINT_ASSERT(self);
 341   if (not self)
 342     return 0;
 343
 344   return self->cursor_active;
 345 }
 346
 347 const char *memcached_server_error(memcached_server_instance_st ptr)
 348 {
 349   return ptr ?  ptr->cached_server_error : NULL;
 350 }
 351