git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/server.c

   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->number_of_hosts= 0;
  23   self->cursor_active= 0;
  24   self->port= port;
  25   self->cached_errno= 0;
  26   self->fd= -1;
  27   self->io_bytes_sent= 0;
  28   self->server_failure_counter= 0;
  29   self->weight= weight ? weight : 1; // 1 is the default weight value
  30   self->state.is_corked= false;
  31   self->state.is_dead= false;
  32   WATCHPOINT_SET(self->io_wait_count.read= 0);
  33   WATCHPOINT_SET(self->io_wait_count.write= 0);
  34   self->major_version= UINT8_MAX;
  35   self->micro_version= UINT8_MAX;
  36   self->minor_version= UINT8_MAX;
  37   self->type= type;
  38   self->read_ptr= self->read_buffer;
  39   self->cached_server_error= NULL;
  40   self->read_buffer_length= 0;
  41   self->read_data_length= 0;
  42   self->write_buffer_offset= 0;
  43   self->address_info= NULL;
  44   self->address_info_next= NULL;
  45
  46   if (root)
  47   {
  48     self->next_retry= root->retry_timeout;
  49   }
  50   else
  51   {
  52     self->next_retry= 0;
  53   }
  54
  55   if (self->weight > 1 && root)
  56   {
  57     ((memcached_st *)root)->ketama.weighted= true;
  58   }
  59
  60   self->root= root;
  61   self->limit_maxbytes= 0;
  62   if (hostname == NULL)
  63   {
  64     self->hostname[0]= 0;
  65   }
  66   else
  67   {
  68     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  69   }
  70 }
  71
  72 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  73 {
  74   if (self == NULL)
  75   {
  76    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  77
  78     if (! self)
  79       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  80
  81     self->options.is_allocated= true;
  82   }
  83   else
  84   {
  85     self->options.is_allocated= false;
  86   }
  87
  88   self->options.is_initialized= true;
  89
  90   return self;
  91 }
  92
  93 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  94                                                   memcached_server_write_instance_st self,
  95                                                   const char *hostname, in_port_t port,
  96                                                   uint32_t weight, memcached_connection_t type)
  97 {
  98   self= _server_create(self, memc);
  99
 100   if (self == NULL)
 101     return NULL;
 102
 103   _server_init(self, memc, hostname, port, weight, type);
 104
 105
 106   if (type == MEMCACHED_CONNECTION_UDP)
 107   {
 108     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 109     memcached_io_init_udp_header(self, 0);
 110   }
 111
 112   return self;
 113 }
 114
 115 void memcached_server_free(memcached_server_st *self)
 116 {
 117   memcached_quit_server(self, false);
 118
 119   if (self->cached_server_error)
 120     free(self->cached_server_error);
 121
 122   if (self->address_info)
 123     freeaddrinfo(self->address_info);
 124
 125   if (memcached_is_allocated(self))
 126   {
 127     if (self->root)
 128     {
 129       libmemcached_free(self->root, self);
 130     }
 131     else
 132     {
 133       free(self);
 134     }
 135   }
 136   else
 137   {
 138     self->options.is_initialized= false;
 139   }
 140 }
 141
 142 /*
 143   If we do not have a valid object to clone from, we toss an error.
 144 */
 145 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 146                                             const memcached_server_st *source)
 147 {
 148   /* We just do a normal create if source is missing */
 149   if (source == NULL)
 150     return NULL;
 151
 152   destination= memcached_server_create_with(source->root, destination,
 153                                             source->hostname, source->port, source->weight,
 154                                             source->type);
 155   if (destination != NULL)
 156   {
 157     destination->cached_errno= source->cached_errno;
 158
 159     if (source->cached_server_error)
 160       destination->cached_server_error= strdup(source->cached_server_error);
 161   }
 162
 163   return destination;
 164
 165 }
 166
 167 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 168                                            const memcached_server_fn *callback,
 169                                            void *context,
 170                                            uint32_t number_of_callbacks)
 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   uint32_t server_key;
 217   memcached_server_instance_st instance;
 218
 219   *error= memcached_validate_key_length(key_length,
 220                                         ptr->flags.binary_protocol);
 221   unlikely (*error != MEMCACHED_SUCCESS)
 222     return NULL;
 223
 224   unlikely (memcached_server_count(ptr) == 0)
 225   {
 226     *error= MEMCACHED_NO_SERVERS;
 227     return NULL;
 228   }
 229
 230   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 231   {
 232     *error= MEMCACHED_BAD_KEY_PROVIDED;
 233     return NULL;
 234   }
 235
 236   server_key= memcached_generate_hash(ptr, key, key_length);
 237   instance= memcached_server_instance_by_position(ptr, server_key);
 238
 239   return instance;
 240
 241 }
 242
 243 void memcached_server_error_reset(memcached_server_st *ptr)
 244 {
 245   ptr->cached_server_error[0]= 0;
 246 }
 247
 248 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *ptr)
 249 {
 250   return ptr->last_disconnected_server;
 251 }
 252
 253 void memcached_server_list_free(memcached_server_list_st self)
 254 {
 255   if (self == NULL)
 256     return;
 257
 258   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 259   {
 260     if (self[x].address_info)
 261     {
 262       freeaddrinfo(self[x].address_info);
 263       self[x].address_info= NULL;
 264     }
 265   }
 266
 267   const memcached_st *root= self->root;
 268   if (root)
 269   {
 270     libmemcached_free(root, self);
 271   }
 272   else
 273   {
 274     free(self);
 275   }
 276 }
 277
 278 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 279 {
 280   return servers->number_of_hosts= count;
 281 }
 282
 283 uint32_t memcached_server_count(const memcached_st *self)
 284 {
 285   return self->number_of_hosts;
 286 }
 287
 288 const char *memcached_server_name(memcached_server_instance_st self)
 289 {
 290   return self->hostname;
 291 }
 292
 293 in_port_t memcached_server_port(memcached_server_instance_st self)
 294 {
 295   return self->port;
 296 }
 297
 298 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 299 {
 300   return self->cursor_active;
 301 }
 302
 303 const char *memcached_server_error(memcached_server_instance_st ptr)
 304 {
 305   return ptr
 306     ?  ptr->cached_server_error
 307     : NULL;
 308 }
 309