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