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