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->state.is_dead= false;
  33   self->major_version= 0;
  34   self->micro_version= 0;
  35   self->minor_version= 0;
  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
  44   if (root)
  45   {
  46     self->next_retry= root->retry_timeout;
  47   }
  48   else
  49   {
  50     self->next_retry= 0;
  51   }
  52
  53   self->root= root;
  54   self->limit_maxbytes= 0;
  55   if (hostname == NULL)
  56     self->hostname[0]= 0;
  57   else
  58     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  59 }
  60
  61 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  62 {
  63   if (self == NULL)
  64   {
  65    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  66
  67     if (! self)
  68       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  69
  70     self->options.is_allocated= true;
  71   }
  72   else
  73   {
  74     self->options.is_allocated= false;
  75   }
  76
  77   self->options.is_initialized= true;
  78
  79   return self;
  80 }
  81
  82 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  83                                                   memcached_server_write_instance_st self,
  84                                                   const char *hostname, in_port_t port,
  85                                                   uint32_t weight, memcached_connection_t type)
  86 {
  87   self= _server_create(self, memc);
  88
  89   if (self == NULL)
  90     return NULL;
  91
  92   _server_init(self, memc, hostname, port, weight, type);
  93
  94
  95   if (type == MEMCACHED_CONNECTION_UDP)
  96   {
  97     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
  98     memcached_io_init_udp_header(self, 0);
  99   }
 100
 101   return self;
 102 }
 103
 104 void memcached_server_free(memcached_server_st *self)
 105 {
 106   memcached_quit_server(self, false);
 107
 108   if (self->cached_server_error)
 109     free(self->cached_server_error);
 110
 111   if (self->address_info)
 112     freeaddrinfo(self->address_info);
 113
 114   if (memcached_is_allocated(self))
 115   {
 116     libmemcached_free(self->root, self);
 117   }
 118   else
 119   {
 120     self->options.is_initialized= false;
 121   }
 122 }
 123
 124 /*
 125   If we do not have a valid object to clone from, we toss an error.
 126 */
 127 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 128                                             const memcached_server_st *source)
 129 {
 130   /* We just do a normal create if source is missing */
 131   if (source == NULL)
 132     return NULL;
 133
 134   destination= memcached_server_create_with(source->root, destination,
 135                                             source->hostname, source->port, source->weight,
 136                                             source->type);
 137   if (destination != NULL)
 138   {
 139     destination->cached_errno= source->cached_errno;
 140
 141     if (source->cached_server_error)
 142       destination->cached_server_error= strdup(source->cached_server_error);
 143   }
 144
 145   return destination;
 146
 147 }
 148
 149 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 150                                            const memcached_server_fn *callback,
 151                                            void *context,
 152                                            uint32_t number_of_callbacks)
 153 {
 154   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 155   {
 156     memcached_server_instance_st instance=
 157       memcached_server_instance_by_position(ptr, x);
 158
 159     for (uint32_t y= 0; y < number_of_callbacks; y++)
 160     {
 161       unsigned int iferror;
 162
 163       iferror= (*callback[y])(ptr, instance, context);
 164
 165       if (iferror)
 166         continue;
 167     }
 168   }
 169
 170   return MEMCACHED_SUCCESS;
 171 }
 172
 173 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 174                                                      const char *key,
 175                                                      size_t key_length,
 176                                                      memcached_return_t *error)
 177 {
 178   uint32_t server_key;
 179   memcached_server_instance_st instance;
 180
 181   *error= memcached_validate_key_length(key_length,
 182                                         ptr->flags.binary_protocol);
 183   unlikely (*error != MEMCACHED_SUCCESS)
 184     return NULL;
 185
 186   unlikely (memcached_server_count(ptr) == 0)
 187   {
 188     *error= MEMCACHED_NO_SERVERS;
 189     return NULL;
 190   }
 191
 192   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 193   {
 194     *error= MEMCACHED_BAD_KEY_PROVIDED;
 195     return NULL;
 196   }
 197
 198   server_key= memcached_generate_hash(ptr, key, key_length);
 199   instance= memcached_server_instance_by_position(ptr, server_key);
 200
 201   return instance;
 202
 203 }
 204
 205 void memcached_server_error_reset(memcached_server_st *ptr)
 206 {
 207   ptr->cached_server_error[0]= 0;
 208 }
 209
 210 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *ptr)
 211 {
 212   return ptr->last_disconnected_server;
 213 }
 214
 215 void memcached_server_list_free(memcached_server_list_st self)
 216 {
 217   if (self == NULL)
 218     return;
 219
 220   const memcached_st *root= self->root;
 221
 222   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 223   {
 224     if (self[x].address_info)
 225     {
 226       freeaddrinfo(self[x].address_info);
 227       self[x].address_info= NULL;
 228     }
 229   }
 230
 231   if (root)
 232   {
 233     libmemcached_free(root, self);
 234   }
 235   else
 236   {
 237     free(self);
 238   }
 239 }
 240
 241 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 242 {
 243   return servers->number_of_hosts= count;
 244 }
 245
 246 uint32_t memcached_server_count(const memcached_st *self)
 247 {
 248   return self->number_of_hosts;
 249 }
 250
 251 const char *memcached_server_name(memcached_server_instance_st self)
 252 {
 253   return self->hostname;
 254 }
 255
 256 in_port_t memcached_server_port(memcached_server_instance_st self)
 257 {
 258   return self->port;
 259 }
 260
 261 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 262 {
 263   return self->cursor_active;
 264 }
 265
 266 const char *memcached_server_error(memcached_server_instance_st ptr)
 267 {
 268   return ptr
 269     ?  ptr->cached_server_error
 270     : NULL;
 271 }
 272