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   self->root= root;
  55   self->limit_maxbytes= 0;
  56   if (hostname == NULL)
  57   {
  58     self->hostname[0]= 0;
  59   }
  60   else
  61   {
  62     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  63   }
  64 }
  65
  66 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  67 {
  68   if (self == NULL)
  69   {
  70    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  71
  72     if (! self)
  73       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  74
  75     self->options.is_allocated= true;
  76   }
  77   else
  78   {
  79     self->options.is_allocated= false;
  80   }
  81
  82   self->options.is_initialized= true;
  83
  84   return self;
  85 }
  86
  87 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  88                                                   memcached_server_write_instance_st self,
  89                                                   const char *hostname, in_port_t port,
  90                                                   uint32_t weight, memcached_connection_t type)
  91 {
  92   self= _server_create(self, memc);
  93
  94   if (self == NULL)
  95     return NULL;
  96
  97   _server_init(self, memc, hostname, port, weight, type);
  98
  99
 100   if (type == MEMCACHED_CONNECTION_UDP)
 101   {
 102     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 103     memcached_io_init_udp_header(self, 0);
 104   }
 105
 106   return self;
 107 }
 108
 109 void memcached_server_free(memcached_server_st *self)
 110 {
 111   memcached_quit_server(self, false);
 112
 113   if (self->cached_server_error)
 114     free(self->cached_server_error);
 115
 116   if (self->address_info)
 117     freeaddrinfo(self->address_info);
 118
 119   if (memcached_is_allocated(self))
 120   {
 121     if (self->root)
 122     {
 123       libmemcached_free(self->root, self);
 124     }
 125     else
 126     {
 127       free(self);
 128     }
 129   }
 130   else
 131   {
 132     self->options.is_initialized= false;
 133   }
 134 }
 135
 136 /*
 137   If we do not have a valid object to clone from, we toss an error.
 138 */
 139 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 140                                             const memcached_server_st *source)
 141 {
 142   /* We just do a normal create if source is missing */
 143   if (source == NULL)
 144     return NULL;
 145
 146   destination= memcached_server_create_with(source->root, destination,
 147                                             source->hostname, source->port, source->weight,
 148                                             source->type);
 149   if (destination != NULL)
 150   {
 151     destination->cached_errno= source->cached_errno;
 152
 153     if (source->cached_server_error)
 154       destination->cached_server_error= strdup(source->cached_server_error);
 155   }
 156
 157   return destination;
 158
 159 }
 160
 161 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 162                                            const memcached_server_fn *callback,
 163                                            void *context,
 164                                            uint32_t number_of_callbacks)
 165 {
 166   memcached_return_t rc;
 167   if ((rc= initialize_const_query(ptr)) != MEMCACHED_SUCCESS)
 168   {
 169     return rc;
 170   }
 171
 172   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 173   {
 174     memcached_server_instance_st instance=
 175       memcached_server_instance_by_position(ptr, x);
 176
 177     for (uint32_t y= 0; y < number_of_callbacks; y++)
 178     {
 179       unsigned int iferror;
 180
 181       iferror= (*callback[y])(ptr, instance, context);
 182
 183       if (iferror)
 184         continue;
 185     }
 186   }
 187
 188   return MEMCACHED_SUCCESS;
 189 }
 190
 191 memcached_return_t memcached_server_execute(memcached_st *ptr,
 192                                             memcached_server_execute_fn callback,
 193                                             void *context)
 194 {
 195   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 196   {
 197     memcached_server_write_instance_st instance=
 198       memcached_server_instance_fetch(ptr, x);
 199
 200     unsigned int iferror;
 201
 202     iferror= (*callback)(ptr, instance, context);
 203
 204     if (iferror)
 205       continue;
 206   }
 207
 208   return MEMCACHED_SUCCESS;
 209 }
 210
 211 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 212                                                      const char *key,
 213                                                      size_t key_length,
 214                                                      memcached_return_t *error)
 215 {
 216   memcached_return_t rc;
 217   if (memcached_failed(rc= initialize_const_query(ptr)))
 218   {
 219     if (error)
 220       *error= rc;
 221
 222     return NULL;
 223   }
 224
 225   if (memcached_failed(rc= memcached_validate_key_length(key_length, ptr->flags.binary_protocol)))
 226   {
 227     if (error)
 228       *error= rc;
 229
 230     return NULL;
 231   }
 232
 233   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 234   {
 235     if (error)
 236       *error= MEMCACHED_BAD_KEY_PROVIDED;
 237     return NULL;
 238   }
 239
 240   uint32_t server_key= memcached_generate_hash(ptr, key, key_length);
 241   return memcached_server_instance_by_position(ptr, server_key);
 242
 243 }
 244
 245 void memcached_server_error_reset(memcached_server_st *self)
 246 {
 247   WATCHPOINT_ASSERT(self);
 248   if (not self)
 249     return;
 250
 251   self->cached_server_error[0]= 0;
 252 }
 253
 254 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *self)
 255 {
 256   WATCHPOINT_ASSERT(self);
 257   if (not self)
 258     return 0;
 259
 260   return self->last_disconnected_server;
 261 }
 262
 263 void memcached_server_list_free(memcached_server_list_st self)
 264 {
 265   if (not self)
 266     return;
 267
 268   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 269   {
 270     if (self[x].address_info)
 271     {
 272       freeaddrinfo(self[x].address_info);
 273       self[x].address_info= NULL;
 274     }
 275   }
 276
 277   const memcached_st *root= self->root;
 278   if (root)
 279   {
 280     libmemcached_free(root, self);
 281   }
 282   else
 283   {
 284     free(self);
 285   }
 286 }
 287
 288 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 289 {
 290   WATCHPOINT_ASSERT(servers);
 291   if (not servers)
 292     return 0;
 293
 294   return servers->number_of_hosts= count;
 295 }
 296
 297 uint32_t memcached_server_count(const memcached_st *self)
 298 {
 299   WATCHPOINT_ASSERT(self);
 300   if (not self)
 301     return 0;
 302
 303   return self->number_of_hosts;
 304 }
 305
 306 const char *memcached_server_name(memcached_server_instance_st self)
 307 {
 308   WATCHPOINT_ASSERT(self);
 309   if (not self)
 310     return NULL;
 311
 312   return self->hostname;
 313 }
 314
 315 in_port_t memcached_server_port(memcached_server_instance_st self)
 316 {
 317   WATCHPOINT_ASSERT(self);
 318   if (not self)
 319     return 0;
 320
 321   return self->port;
 322 }
 323
 324 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 325 {
 326   WATCHPOINT_ASSERT(self);
 327   if (not self)
 328     return 0;
 329
 330   return self->cursor_active;
 331 }
 332
 333 const char *memcached_server_error(memcached_server_instance_st ptr)
 334 {
 335   return ptr ?  ptr->cached_server_error : NULL;
 336 }
 337