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
  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->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   memcpy(self->hostname, hostname.c_str, hostname.size);
  85   self->hostname[hostname.size]= 0;
  86 }
  87
  88 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  89 {
  90   if (not self)
  91   {
  92    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  93
  94     if (not self)
  95     {
  96       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  97     }
  98
  99     self->options.is_allocated= true;
 100   }
 101   else
 102   {
 103     self->options.is_allocated= false;
 104   }
 105
 106   self->options.is_initialized= true;
 107
 108   return self;
 109 }
 110
 111 memcached_server_st *__server_create_with(memcached_st *memc,
 112                                           memcached_server_write_instance_st self,
 113                                           const memcached_string_t& hostname,
 114                                           const in_port_t port,
 115                                           uint32_t weight,
 116                                           const memcached_connection_t type)
 117 {
 118   if (memcached_is_valid_servername(hostname) == false)
 119   {
 120     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 121     return NULL;
 122   }
 123
 124   self= _server_create(self, memc);
 125
 126   if (not self)
 127   {
 128     return NULL;
 129   }
 130
 131   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 132
 133
 134   if (type == MEMCACHED_CONNECTION_UDP)
 135   {
 136     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 137     memcached_io_init_udp_header(self, 0);
 138   }
 139
 140   return self;
 141 }
 142
 143 void __server_free(memcached_server_st *self)
 144 {
 145   memcached_quit_server(self, false);
 146
 147   if (self->address_info)
 148   {
 149     freeaddrinfo(self->address_info);
 150     self->address_info= NULL;
 151     self->address_info_next= NULL;
 152   }
 153
 154   memcached_error_free(*self);
 155
 156   if (memcached_is_allocated(self))
 157   {
 158     libmemcached_free(self->root, self);
 159   }
 160   else
 161   {
 162     self->options.is_initialized= false;
 163   }
 164 }
 165
 166 void memcached_server_free(memcached_server_st *self)
 167 {
 168   if (not self)
 169     return;
 170
 171   if (memcached_server_list_count(self))
 172   {
 173     memcached_server_list_free(self);
 174     return;
 175   }
 176
 177   __server_free(self);
 178 }
 179
 180 /*
 181   If we do not have a valid object to clone from, we toss an error.
 182 */
 183 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 184                                             memcached_server_st *source)
 185 {
 186   /* We just do a normal create if source is missing */
 187   if (not source)
 188   {
 189     return NULL;
 190   }
 191
 192   memcached_string_t hostname= { memcached_string_make_from_cstr(source->hostname) };
 193   destination= __server_create_with(source->root, destination,
 194                                     hostname,
 195                                     source->port, source->weight,
 196                                     source->type);
 197   if (not destination)
 198   {
 199     if (source->error_messages)
 200     {
 201       destination->error_messages= memcached_error_copy(*source);
 202     }
 203   }
 204
 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(const memcached_st *ptr,
 261                                                      const char *key,
 262                                                      size_t key_length,
 263                                                      memcached_return_t *error)
 264 {
 265   memcached_return_t rc;
 266   memcached_return_t unused;
 267
 268   if (not error)
 269     error= &unused;
 270
 271   if (memcached_failed(rc= initialize_const_query(ptr)))
 272   {
 273     *error= rc;
 274     return NULL;
 275   }
 276
 277   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 278   {
 279     *error= rc;
 280     return NULL;
 281   }
 282
 283   if (memcached_failed((memcached_key_test(*ptr, (const char **)&key, &key_length, 1))))
 284   {
 285     *error= MEMCACHED_BAD_KEY_PROVIDED;
 286     return NULL;
 287   }
 288
 289   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 290   return memcached_server_instance_by_position(ptr, server_key);
 291
 292 }
 293
 294 void memcached_server_error_reset(memcached_server_st *self)
 295 {
 296   WATCHPOINT_ASSERT(self);
 297   if (not self)
 298   {
 299     return;
 300   }
 301
 302   memcached_error_free(*self);
 303 }
 304
 305 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 306 {
 307   WATCHPOINT_ASSERT(self);
 308   if (not self)
 309     return 0;
 310
 311   return self->last_disconnected_server;
 312 }
 313
 314 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 315 {
 316   WATCHPOINT_ASSERT(servers);
 317   if (not servers)
 318     return 0;
 319
 320   return servers->number_of_hosts= count;
 321 }
 322
 323 uint32_t memcached_server_count(const memcached_st *self)
 324 {
 325   WATCHPOINT_ASSERT(self);
 326   if (not self)
 327     return 0;
 328
 329   return self->number_of_hosts;
 330 }
 331
 332 const char *memcached_server_name(const memcached_server_instance_st self)
 333 {
 334   WATCHPOINT_ASSERT(self);
 335   if (not self)
 336     return NULL;
 337
 338   return self->hostname;
 339 }
 340
 341 in_port_t memcached_server_port(const memcached_server_instance_st self)
 342 {
 343   WATCHPOINT_ASSERT(self);
 344   if (not self)
 345     return 0;
 346
 347   return self->port;
 348 }
 349
 350 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 351 {
 352   WATCHPOINT_ASSERT(self);
 353   if (not self)
 354     return 0;
 355
 356   return self->cursor_active;
 357 }
 358
 359 const char *memcached_server_type(const memcached_server_instance_st ptr)
 360 {
 361   if (ptr)
 362   {
 363     switch (ptr->type)
 364     {
 365     case MEMCACHED_CONNECTION_TCP:
 366       return "TCP";
 367
 368     case MEMCACHED_CONNECTION_UDP:
 369       return "UDP";
 370
 371     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 372       return "SOCKET";
 373     }
 374   }
 375
 376   return "UNKNOWN";
 377 }