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 memcached_string_t& hostname,
  45                                 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->server_failure_counter_query_id= 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->error_messages= NULL;
  65   self->read_ptr= self->read_buffer;
  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   self->next_retry= 0;
  74
  75   self->root= root;
  76   if (root)
  77   {
  78     self->version= ++root->server_info.version;
  79   }
  80   else
  81   {
  82     self->version= UINT_MAX;
  83   }
  84   self->limit_maxbytes= 0;
  85   memcpy(self->hostname, hostname.c_str, hostname.size);
  86   self->hostname[hostname.size]= 0;
  87 }
  88
  89 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  90 {
  91   if (not self)
  92   {
  93    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  94
  95     if (not self)
  96     {
  97       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  98     }
  99
 100     self->options.is_allocated= true;
 101   }
 102   else
 103   {
 104     self->options.is_allocated= false;
 105   }
 106
 107   self->options.is_initialized= true;
 108
 109   return self;
 110 }
 111
 112 memcached_server_st *__server_create_with(memcached_st *memc,
 113                                           memcached_server_write_instance_st self,
 114                                           const memcached_string_t& hostname,
 115                                           const in_port_t port,
 116                                           uint32_t weight,
 117                                           const memcached_connection_t type)
 118 {
 119   if (memcached_is_valid_servername(hostname) == false)
 120   {
 121     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 122     return NULL;
 123   }
 124
 125   self= _server_create(self, memc);
 126
 127   if (self == NULL)
 128   {
 129     return NULL;
 130   }
 131
 132   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 133
 134
 135   if (memc and memcached_is_udp(memc))
 136   {
 137     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 138     memcached_io_init_udp_header(self, 0);
 139   }
 140
 141   if (memc)
 142   {
 143     set_hostinfo(self);
 144   }
 145
 146   return self;
 147 }
 148
 149 void __server_free(memcached_server_st *self)
 150 {
 151   memcached_quit_server(self, false);
 152
 153   if (self->address_info)
 154   {
 155     freeaddrinfo(self->address_info);
 156     self->address_info= NULL;
 157     self->address_info_next= NULL;
 158   }
 159
 160   memcached_error_free(*self);
 161
 162   if (memcached_is_allocated(self))
 163   {
 164     libmemcached_free(self->root, self);
 165   }
 166   else
 167   {
 168     self->options.is_initialized= false;
 169   }
 170 }
 171
 172 void memcached_server_free(memcached_server_st *self)
 173 {
 174   if (self == NULL)
 175   {
 176     return;
 177   }
 178
 179   if (memcached_server_list_count(self))
 180   {
 181     memcached_server_list_free(self);
 182     return;
 183   }
 184
 185   __server_free(self);
 186 }
 187
 188 /*
 189   If we do not have a valid object to clone from, we toss an error.
 190 */
 191 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 192                                             memcached_server_st *source)
 193 {
 194   /* We just do a normal create if source is missing */
 195   if (source == NULL)
 196   {
 197     return NULL;
 198   }
 199
 200   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 201   destination= __server_create_with(source->root, destination,
 202                                     hostname,
 203                                     source->port, source->weight,
 204                                     source->type);
 205   return destination;
 206
 207 }
 208
 209 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 210                                            const memcached_server_fn *callback,
 211                                            void *context,
 212                                            uint32_t number_of_callbacks)
 213 {
 214   memcached_return_t rc;
 215   if (memcached_failed(rc= initialize_const_query(ptr)))
 216   {
 217     return rc;
 218   }
 219
 220   size_t errors= 0;
 221   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 222   {
 223     memcached_server_instance_st instance=
 224       memcached_server_instance_by_position(ptr, x);
 225
 226     for (uint32_t y= 0; y < number_of_callbacks; y++)
 227     {
 228       memcached_return_t ret= (*callback[y])(ptr, instance, context);
 229
 230       if (memcached_failed(ret))
 231       {
 232         errors++;
 233         continue;
 234       }
 235     }
 236   }
 237
 238   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 239 }
 240
 241 memcached_return_t memcached_server_execute(memcached_st *ptr,
 242                                             memcached_server_execute_fn callback,
 243                                             void *context)
 244 {
 245   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 246   {
 247     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 248
 249     unsigned int iferror= (*callback)(ptr, instance, context);
 250
 251     if (iferror)
 252     {
 253       continue;
 254     }
 255   }
 256
 257   return MEMCACHED_SUCCESS;
 258 }
 259
 260 memcached_server_instance_st memcached_server_by_key(memcached_st *ptr,
 261                                                      const char *key,
 262                                                      size_t key_length,
 263                                                      memcached_return_t *error)
 264 {
 265   memcached_return_t unused;
 266   if (not error)
 267   {
 268     error= &unused;
 269   }
 270
 271
 272   memcached_return_t rc;
 273   if (memcached_failed(rc= initialize_const_query(ptr)))
 274   {
 275     *error= rc;
 276     return NULL;
 277   }
 278
 279   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 280   {
 281     *error= rc;
 282     return NULL;
 283   }
 284
 285   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 286   {
 287     *error= MEMCACHED_BAD_KEY_PROVIDED;
 288     return NULL;
 289   }
 290
 291   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 292   return memcached_server_instance_by_position(ptr, server_key);
 293
 294 }
 295
 296 void memcached_server_error_reset(memcached_server_st *self)
 297 {
 298   WATCHPOINT_ASSERT(self);
 299   if (not self)
 300   {
 301     return;
 302   }
 303
 304   memcached_error_free(*self);
 305 }
 306
 307 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 308 {
 309   WATCHPOINT_ASSERT(self);
 310   if (not self)
 311     return 0;
 312
 313   return self->last_disconnected_server;
 314 }
 315
 316 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 317 {
 318   WATCHPOINT_ASSERT(servers);
 319   if (not servers)
 320     return 0;
 321
 322   return servers->number_of_hosts= count;
 323 }
 324
 325 uint32_t memcached_server_count(const memcached_st *self)
 326 {
 327   WATCHPOINT_ASSERT(self);
 328   if (not self)
 329     return 0;
 330
 331   return self->number_of_hosts;
 332 }
 333
 334 const char *memcached_server_name(const memcached_server_instance_st self)
 335 {
 336   WATCHPOINT_ASSERT(self);
 337   if (not self)
 338     return NULL;
 339
 340   return self->hostname;
 341 }
 342
 343 in_port_t memcached_server_port(const memcached_server_instance_st self)
 344 {
 345   WATCHPOINT_ASSERT(self);
 346   if (not self)
 347     return 0;
 348
 349   return self->port;
 350 }
 351
 352 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 353 {
 354   WATCHPOINT_ASSERT(self);
 355   if (not self)
 356     return 0;
 357
 358   return self->cursor_active;
 359 }
 360
 361 const char *memcached_server_type(const memcached_server_instance_st ptr)
 362 {
 363   if (ptr)
 364   {
 365     switch (ptr->type)
 366     {
 367     case MEMCACHED_CONNECTION_TCP:
 368       return "TCP";
 369
 370     case MEMCACHED_CONNECTION_UDP:
 371       return "UDP";
 372
 373     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 374       return "SOCKET";
 375     }
 376   }
 377
 378   return "UNKNOWN";
 379 }