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   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= INVALID_SOCKET;
  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   self->io_wait_count.read= 0;
  59   self->io_wait_count.write= 0;
  60   self->io_wait_count.timeouts= 0;
  61   self->io_wait_count._bytes_read= 0;
  62   self->major_version= UINT8_MAX;
  63   self->micro_version= UINT8_MAX;
  64   self->minor_version= UINT8_MAX;
  65   self->type= type;
  66   self->error_messages= NULL;
  67   self->read_ptr= self->read_buffer;
  68   self->read_buffer_length= 0;
  69   self->read_data_length= 0;
  70   self->write_buffer_offset= 0;
  71   self->address_info= NULL;
  72   self->address_info_next= NULL;
  73
  74   self->state= MEMCACHED_SERVER_STATE_NEW;
  75   self->next_retry= 0;
  76
  77   self->root= root;
  78   if (root)
  79   {
  80     self->version= ++root->server_info.version;
  81   }
  82   else
  83   {
  84     self->version= UINT_MAX;
  85   }
  86   self->limit_maxbytes= 0;
  87   memcpy(self->hostname, hostname.c_str, hostname.size);
  88   self->hostname[hostname.size]= 0;
  89 }
  90
  91 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  92 {
  93   if (self == NULL)
  94   {
  95    self= libmemcached_xmalloc(memc, struct memcached_server_st);
  96
  97     if (self == NULL)
  98     {
  99       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 100     }
 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(memcached_st *memc,
 115                                           memcached_server_write_instance_st self,
 116                                           const memcached_string_t& hostname,
 117                                           const in_port_t port,
 118                                           uint32_t weight,
 119                                           const memcached_connection_t type)
 120 {
 121   if (memcached_is_valid_servername(hostname) == false)
 122   {
 123     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 124     return NULL;
 125   }
 126
 127   self= _server_create(self, memc);
 128
 129   if (self == NULL)
 130   {
 131     return NULL;
 132   }
 133
 134   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 135
 136   if (memc and memcached_is_udp(memc))
 137   {
 138     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 139     memcached_io_init_udp_header(self, 0);
 140   }
 141
 142   if (memc)
 143   {
 144     memcached_connect_try(self);
 145   }
 146
 147   return self;
 148 }
 149
 150 void __server_free(memcached_server_st *self)
 151 {
 152   memcached_quit_server(self, false);
 153
 154   if (self->address_info)
 155   {
 156     freeaddrinfo(self->address_info);
 157     self->address_info= NULL;
 158     self->address_info_next= NULL;
 159   }
 160
 161   memcached_error_free(*self);
 162
 163   if (memcached_is_allocated(self))
 164   {
 165     libmemcached_free(self->root, self);
 166   }
 167   else
 168   {
 169     self->options.is_initialized= false;
 170   }
 171 }
 172
 173 void memcached_server_free(memcached_server_st *self)
 174 {
 175   if (self == NULL)
 176   {
 177     return;
 178   }
 179
 180   if (memcached_server_list_count(self))
 181   {
 182     memcached_server_list_free(self);
 183     return;
 184   }
 185
 186   __server_free(self);
 187 }
 188
 189 /*
 190   If we do not have a valid object to clone from, we toss an error.
 191 */
 192 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 193                                             memcached_server_st *source)
 194 {
 195   /* We just do a normal create if source is missing */
 196   if (source == NULL)
 197   {
 198     return NULL;
 199   }
 200
 201   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 202   destination= __server_create_with(source->root, destination,
 203                                     hostname,
 204                                     source->port, source->weight,
 205                                     source->type);
 206   return destination;
 207
 208 }
 209
 210 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 211                                            const memcached_server_fn *callback,
 212                                            void *context,
 213                                            uint32_t number_of_callbacks)
 214 {
 215   memcached_return_t rc;
 216   if (memcached_failed(rc= initialize_const_query(ptr)))
 217   {
 218     return rc;
 219   }
 220
 221   size_t errors= 0;
 222   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 223   {
 224     memcached_server_instance_st instance=
 225       memcached_server_instance_by_position(ptr, x);
 226
 227     for (uint32_t y= 0; y < number_of_callbacks; y++)
 228     {
 229       memcached_return_t ret= (*callback[y])(ptr, instance, context);
 230
 231       if (memcached_failed(ret))
 232       {
 233         errors++;
 234         continue;
 235       }
 236     }
 237   }
 238
 239   return errors ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
 240 }
 241
 242 memcached_return_t memcached_server_execute(memcached_st *ptr,
 243                                             memcached_server_execute_fn callback,
 244                                             void *context)
 245 {
 246   if (callback == NULL)
 247   {
 248     return MEMCACHED_INVALID_ARGUMENTS;
 249   }
 250
 251   bool some_errors= false;;
 252   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 253   {
 254     memcached_server_write_instance_st instance= memcached_server_instance_fetch(ptr, x);
 255
 256     memcached_return_t rc= (*callback)(ptr, instance, context);
 257     if (rc == MEMCACHED_INVALID_ARGUMENTS)
 258     {
 259       return rc;
 260     }
 261     else if (memcached_fatal(rc))
 262     {
 263       some_errors= true;
 264     }
 265   }
 266
 267   (void)some_errors;
 268   return MEMCACHED_SUCCESS;
 269 }
 270
 271 memcached_server_instance_st memcached_server_by_key(memcached_st *ptr,
 272                                                      const char *key,
 273                                                      size_t key_length,
 274                                                      memcached_return_t *error)
 275 {
 276   memcached_return_t unused;
 277   if (not error)
 278   {
 279     error= &unused;
 280   }
 281
 282
 283   memcached_return_t rc;
 284   if (memcached_failed(rc= initialize_const_query(ptr)))
 285   {
 286     *error= rc;
 287     return NULL;
 288   }
 289
 290   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 291   {
 292     *error= memcached_last_error(ptr);
 293     return NULL;
 294   }
 295
 296   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 297   return memcached_server_instance_by_position(ptr, server_key);
 298
 299 }
 300
 301 void memcached_server_error_reset(memcached_server_st *self)
 302 {
 303   WATCHPOINT_ASSERT(self);
 304   if (self == NULL)
 305   {
 306     return;
 307   }
 308
 309   memcached_error_free(*self);
 310 }
 311
 312 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 313 {
 314   WATCHPOINT_ASSERT(self);
 315   if (self == NULL)
 316   {
 317     return 0;
 318   }
 319
 320   return self->last_disconnected_server;
 321 }
 322
 323 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 324 {
 325   WATCHPOINT_ASSERT(servers);
 326   if (servers == NULL)
 327   {
 328     return 0;
 329   }
 330
 331   return servers->number_of_hosts= count;
 332 }
 333
 334 uint32_t memcached_server_count(const memcached_st *self)
 335 {
 336   WATCHPOINT_ASSERT(self);
 337   if (self == NULL)
 338     return 0;
 339
 340   return self->number_of_hosts;
 341 }
 342
 343 const char *memcached_server_name(const memcached_server_instance_st self)
 344 {
 345   WATCHPOINT_ASSERT(self);
 346   if (self == NULL)
 347     return NULL;
 348
 349   return self->hostname;
 350 }
 351
 352 in_port_t memcached_server_port(const memcached_server_instance_st self)
 353 {
 354   WATCHPOINT_ASSERT(self);
 355   if (self == NULL)
 356   {
 357     return 0;
 358   }
 359
 360   return self->port;
 361 }
 362
 363 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 364 {
 365   WATCHPOINT_ASSERT(self);
 366   if (self == NULL)
 367   {
 368     return 0;
 369   }
 370
 371   return self->cursor_active;
 372 }
 373
 374 const char *memcached_server_type(const memcached_server_instance_st ptr)
 375 {
 376   if (ptr)
 377   {
 378     switch (ptr->type)
 379     {
 380     case MEMCACHED_CONNECTION_TCP:
 381       return "TCP";
 382
 383     case MEMCACHED_CONNECTION_UDP:
 384       return "UDP";
 385
 386     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 387       return "SOCKET";
 388     }
 389   }
 390
 391   return "UNKNOWN";
 392 }