git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/server.cc

   1 /* LibMemcached
   2  * Copyright (C) 2006-2009 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary: String structure used for libmemcached.
   9  *
  10  */
  11
  12 /*
  13   This is a partial implementation for fetching/creating memcached_server_st objects.
  14 */
  15 #include <libmemcached/common.h>
  16
  17 static inline void _server_init(memcached_server_st *self, const memcached_st *root,
  18                                 const char *hostname, in_port_t port,
  19                                 uint32_t weight, memcached_connection_t type)
  20 {
  21   self->options.is_shutting_down= false;
  22   self->options.is_dead= false;
  23   self->number_of_hosts= 0;
  24   self->cursor_active= 0;
  25   self->port= port;
  26   self->cached_errno= 0;
  27   self->fd= -1;
  28   self->io_bytes_sent= 0;
  29   self->server_failure_counter= 0;
  30   self->weight= weight ? weight : 1; // 1 is the default weight value
  31   WATCHPOINT_SET(self->io_wait_count.read= 0);
  32   WATCHPOINT_SET(self->io_wait_count.write= 0);
  33   self->major_version= UINT8_MAX;
  34   self->micro_version= UINT8_MAX;
  35   self->minor_version= UINT8_MAX;
  36   self->type= type;
  37   self->read_ptr= self->read_buffer;
  38   self->cached_server_error= NULL;
  39   self->read_buffer_length= 0;
  40   self->read_data_length= 0;
  41   self->write_buffer_offset= 0;
  42   self->address_info= NULL;
  43   self->address_info_next= NULL;
  44
  45   if (root)
  46   {
  47     self->next_retry= root->retry_timeout;
  48   }
  49   else
  50   {
  51     self->next_retry= 0;
  52   }
  53
  54   if (self->weight > 1 && root)
  55   {
  56     ((memcached_st *)root)->ketama.weighted= true;
  57   }
  58
  59   self->root= root;
  60   self->limit_maxbytes= 0;
  61   if (hostname == NULL)
  62   {
  63     self->hostname[0]= 0;
  64   }
  65   else
  66   {
  67     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  68   }
  69 }
  70
  71 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  72 {
  73   if (self == NULL)
  74   {
  75    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  76
  77     if (! self)
  78       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  79
  80     self->options.is_allocated= true;
  81   }
  82   else
  83   {
  84     self->options.is_allocated= false;
  85   }
  86
  87   self->options.is_initialized= true;
  88
  89   return self;
  90 }
  91
  92 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  93                                                   memcached_server_write_instance_st self,
  94                                                   const char *hostname, in_port_t port,
  95                                                   uint32_t weight, memcached_connection_t type)
  96 {
  97   self= _server_create(self, memc);
  98
  99   if (self == NULL)
 100     return NULL;
 101
 102   _server_init(self, memc, hostname, port, weight, type);
 103
 104
 105   if (type == MEMCACHED_CONNECTION_UDP)
 106   {
 107     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 108     memcached_io_init_udp_header(self, 0);
 109   }
 110
 111   return self;
 112 }
 113
 114 void memcached_server_free(memcached_server_st *self)
 115 {
 116   memcached_quit_server(self, false);
 117
 118   if (self->cached_server_error)
 119     free(self->cached_server_error);
 120
 121   if (self->address_info)
 122     freeaddrinfo(self->address_info);
 123
 124   if (memcached_is_allocated(self))
 125   {
 126     if (self->root)
 127     {
 128       libmemcached_free(self->root, self);
 129     }
 130     else
 131     {
 132       free(self);
 133     }
 134   }
 135   else
 136   {
 137     self->options.is_initialized= false;
 138   }
 139 }
 140
 141 /*
 142   If we do not have a valid object to clone from, we toss an error.
 143 */
 144 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 145                                             const memcached_server_st *source)
 146 {
 147   /* We just do a normal create if source is missing */
 148   if (source == NULL)
 149     return NULL;
 150
 151   destination= memcached_server_create_with(source->root, destination,
 152                                             source->hostname, source->port, source->weight,
 153                                             source->type);
 154   if (destination != NULL)
 155   {
 156     destination->cached_errno= source->cached_errno;
 157
 158     if (source->cached_server_error)
 159       destination->cached_server_error= strdup(source->cached_server_error);
 160   }
 161
 162   return destination;
 163
 164 }
 165
 166 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 167                                            const memcached_server_fn *callback,
 168                                            void *context,
 169                                            uint32_t number_of_callbacks)
 170 {
 171   memcached_return_t rc;
 172   if ((rc= initialize_const_query(ptr)) != MEMCACHED_SUCCESS)
 173   {
 174     return rc;
 175   }
 176
 177   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 178   {
 179     memcached_server_instance_st instance=
 180       memcached_server_instance_by_position(ptr, x);
 181
 182     for (uint32_t y= 0; y < number_of_callbacks; y++)
 183     {
 184       unsigned int iferror;
 185
 186       iferror= (*callback[y])(ptr, instance, context);
 187
 188       if (iferror)
 189         continue;
 190     }
 191   }
 192
 193   return MEMCACHED_SUCCESS;
 194 }
 195
 196 memcached_return_t memcached_server_execute(memcached_st *ptr,
 197                                             memcached_server_execute_fn callback,
 198                                             void *context)
 199 {
 200   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 201   {
 202     memcached_server_write_instance_st instance=
 203       memcached_server_instance_fetch(ptr, x);
 204
 205     unsigned int iferror;
 206
 207     iferror= (*callback)(ptr, instance, context);
 208
 209     if (iferror)
 210       continue;
 211   }
 212
 213   return MEMCACHED_SUCCESS;
 214 }
 215
 216 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 217                                                      const char *key,
 218                                                      size_t key_length,
 219                                                      memcached_return_t *error)
 220 {
 221   memcached_return_t rc;
 222   if (memcached_failed(rc= initialize_const_query(ptr)))
 223   {
 224     if (error)
 225       *error= rc;
 226
 227     return NULL;
 228   }
 229
 230   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 231   {
 232     if (error)
 233       *error= rc;
 234
 235     return NULL;
 236   }
 237
 238   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 239   {
 240     if (error)
 241       *error= MEMCACHED_BAD_KEY_PROVIDED;
 242     return NULL;
 243   }
 244
 245   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 246   return memcached_server_instance_by_position(ptr, server_key);
 247
 248 }
 249
 250 void memcached_server_error_reset(memcached_server_st *self)
 251 {
 252   WATCHPOINT_ASSERT(self);
 253   if (not self)
 254     return;
 255
 256   self->cached_server_error[0]= 0;
 257 }
 258
 259 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 260 {
 261   WATCHPOINT_ASSERT(self);
 262   if (not self)
 263     return 0;
 264
 265   return self->last_disconnected_server;
 266 }
 267
 268 void memcached_server_list_free(memcached_server_list_st self)
 269 {
 270   if (not self)
 271     return;
 272
 273   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 274   {
 275     if (self[x].address_info)
 276     {
 277       freeaddrinfo(self[x].address_info);
 278       self[x].address_info= NULL;
 279     }
 280   }
 281
 282   const memcached_st *root= self->root;
 283   if (root)
 284   {
 285     libmemcached_free(root, self);
 286   }
 287   else
 288   {
 289     free(self);
 290   }
 291 }
 292
 293 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 294 {
 295   WATCHPOINT_ASSERT(servers);
 296   if (not servers)
 297     return 0;
 298
 299   return servers->number_of_hosts= count;
 300 }
 301
 302 uint32_t memcached_server_count(const memcached_st *self)
 303 {
 304   WATCHPOINT_ASSERT(self);
 305   if (not self)
 306     return 0;
 307
 308   return self->number_of_hosts;
 309 }
 310
 311 const char *memcached_server_name(memcached_server_instance_st self)
 312 {
 313   WATCHPOINT_ASSERT(self);
 314   if (not self)
 315     return NULL;
 316
 317   return self->hostname;
 318 }
 319
 320 in_port_t memcached_server_port(memcached_server_instance_st self)
 321 {
 322   WATCHPOINT_ASSERT(self);
 323   if (not self)
 324     return 0;
 325
 326   return self->port;
 327 }
 328
 329 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 330 {
 331   WATCHPOINT_ASSERT(self);
 332   if (not self)
 333     return 0;
 334
 335   return self->cursor_active;
 336 }
 337
 338 const char *memcached_server_error(memcached_server_instance_st ptr)
 339 {
 340   return ptr ?  ptr->cached_server_error : NULL;
 341 }
 342