git.m6w6.name Git - awesomized/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 "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.sockaddr_inited= false;
  22   self->options.is_shutting_down= 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;
  31   self->state.is_corked= false;
  32   self->major_version= 0;
  33   self->micro_version= 0;
  34   self->minor_version= 0;
  35   self->type= type;
  36   self->read_ptr= self->read_buffer;
  37   self->cached_server_error= NULL;
  38   self->read_buffer_length= 0;
  39   self->read_data_length= 0;
  40   self->write_buffer_offset= 0;
  41   self->address_info= NULL;
  42
  43   if (root)
  44   {
  45     self->next_retry= root->retry_timeout;
  46   }
  47   else
  48   {
  49     self->next_retry= 0;
  50   }
  51
  52   self->root= root;
  53   self->limit_maxbytes= 0;
  54   if (hostname == NULL)
  55     self->hostname[0]= 0;
  56   else
  57     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  58 }
  59
  60 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  61 {
  62   if (self == NULL)
  63   {
  64    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  65
  66     if (! self)
  67       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  68
  69     self->options.is_allocated= true;
  70   }
  71   else
  72   {
  73     self->options.is_allocated= false;
  74   }
  75
  76   self->options.is_initialized= true;
  77
  78   return self;
  79 }
  80
  81 memcached_server_st *memcached_server_create_with(const memcached_st *memc, memcached_server_st *self,
  82                                                   const char *hostname, in_port_t port,
  83                                                   uint32_t weight, memcached_connection_t type)
  84 {
  85   self= _server_create(self, memc);
  86
  87   if (self == NULL)
  88     return NULL;
  89
  90   _server_init(self, memc, hostname, port, weight, type);
  91
  92
  93   if (type == MEMCACHED_CONNECTION_UDP)
  94   {
  95     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
  96     memcached_io_init_udp_header(self, 0);
  97   }
  98
  99   return self;
 100 }
 101
 102 void memcached_server_free(memcached_server_st *self)
 103 {
 104   memcached_quit_server(self, false);
 105
 106   if (self->cached_server_error)
 107     free(self->cached_server_error);
 108
 109   if (self->address_info)
 110     freeaddrinfo(self->address_info);
 111
 112   if (memcached_is_allocated(self))
 113   {
 114     libmemcached_free(self->root, self);
 115   }
 116   else
 117   {
 118     self->options.is_initialized= false;
 119   }
 120 }
 121
 122 /*
 123   If we do not have a valid object to clone from, we toss an error.
 124 */
 125 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 126                                             const memcached_server_st *source)
 127 {
 128   /* We just do a normal create if source is missing */
 129   if (source == NULL)
 130     return NULL;
 131
 132   destination= memcached_server_create_with(source->root, destination,
 133                                             source->hostname, source->port, source->weight,
 134                                             source->type);
 135   if (destination != NULL)
 136   {
 137     destination->cached_errno= source->cached_errno;
 138
 139     if (source->cached_server_error)
 140       destination->cached_server_error= strdup(source->cached_server_error);
 141   }
 142
 143   return destination;
 144
 145 }
 146
 147 memcached_return_t memcached_server_cursor(memcached_st *ptr,
 148                                            memcached_server_fn *callback,
 149                                            void *context,
 150                                            uint32_t number_of_callbacks)
 151 {
 152   uint32_t y;
 153
 154   for (y= 0; y < memcached_server_count(ptr); y++)
 155   {
 156     uint32_t x;
 157     memcached_server_instance_st *instance=
 158       memcached_server_instance_fetch(ptr, y);
 159
 160     for (x= 0; x < number_of_callbacks; x++)
 161     {
 162       unsigned int iferror;
 163
 164       iferror= (*callback[x])(ptr, instance, context);
 165
 166       if (iferror)
 167         continue;
 168     }
 169   }
 170
 171   return MEMCACHED_SUCCESS;
 172 }
 173
 174 memcached_server_st *memcached_server_by_key(memcached_st *ptr,  const char *key, size_t key_length, memcached_return_t *error)
 175 {
 176   uint32_t server_key;
 177   memcached_server_instance_st *instance;
 178
 179   *error= memcached_validate_key_length(key_length,
 180                                         ptr->flags.binary_protocol);
 181   unlikely (*error != MEMCACHED_SUCCESS)
 182     return NULL;
 183
 184   unlikely (memcached_server_count(ptr) == 0)
 185   {
 186     *error= MEMCACHED_NO_SERVERS;
 187     return NULL;
 188   }
 189
 190   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 191   {
 192     *error= MEMCACHED_BAD_KEY_PROVIDED;
 193     return NULL;
 194   }
 195
 196   server_key= memcached_generate_hash(ptr, key, key_length);
 197   instance= memcached_server_instance_fetch(ptr, server_key);
 198
 199   return memcached_server_clone(NULL, instance);
 200
 201 }
 202
 203 const char *memcached_server_error(memcached_server_st *ptr)
 204 {
 205   return ptr
 206     ?  ptr->cached_server_error
 207     : NULL;
 208 }
 209
 210 void memcached_server_error_reset(memcached_server_st *ptr)
 211 {
 212   ptr->cached_server_error[0]= 0;
 213 }
 214
 215 memcached_server_st *memcached_server_get_last_disconnect(memcached_st *ptr)
 216 {
 217   return ptr->last_disconnected_server;
 218 }
 219
 220 uint32_t memcached_server_list_count(memcached_server_st *ptr)
 221 {
 222   return (ptr == NULL)
 223     ? 0
 224     : memcached_servers_count(ptr);
 225 }
 226
 227 void memcached_server_list_free(memcached_server_st *ptr)
 228 {
 229   server_list_free(NULL, ptr);
 230 }
 231
 232 /**
 233   @todo allow lists to query themselves even if they lack a root
 234 */
 235 memcached_return_t memcached_server_remove(memcached_server_st *st_ptr)
 236 {
 237   uint32_t x, host_index;
 238   memcached_st *root= (memcached_st *)st_ptr->root;
 239   memcached_server_st *list;
 240
 241   if (root == NULL)
 242     return MEMCACHED_FAILURE;
 243
 244   list= memcached_server_list(root);
 245
 246   for (x= 0, host_index= 0; x < memcached_server_count(root); x++)
 247   {
 248     if (strncmp(list[x].hostname, st_ptr->hostname, NI_MAXHOST) != 0 || list[x].port != st_ptr->port)
 249     {
 250       if (host_index != x)
 251         memcpy(list+host_index, list+x, sizeof(memcached_server_st));
 252       host_index++;
 253     }
 254   }
 255   root->number_of_hosts= host_index;
 256
 257   if (st_ptr->address_info)
 258   {
 259     freeaddrinfo(st_ptr->address_info);
 260     st_ptr->address_info= NULL;
 261   }
 262   run_distribution(root);
 263
 264   return MEMCACHED_SUCCESS;
 265 }