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->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   WATCHPOINT_SET(self->io_wait_count.read= 0);
  34   WATCHPOINT_SET(self->io_wait_count.write= 0);
  35   self->major_version= 0;
  36   self->micro_version= 0;
  37   self->minor_version= 0;
  38   self->type= type;
  39   self->read_ptr= self->read_buffer;
  40   self->cached_server_error= NULL;
  41   self->read_buffer_length= 0;
  42   self->read_data_length= 0;
  43   self->write_buffer_offset= 0;
  44   self->address_info= 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   self->root= root;
  56   self->limit_maxbytes= 0;
  57   if (hostname == NULL)
  58     self->hostname[0]= 0;
  59   else
  60     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  61 }
  62
  63 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  64 {
  65   if (self == NULL)
  66   {
  67    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  68
  69     if (! self)
  70       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  71
  72     self->options.is_allocated= true;
  73   }
  74   else
  75   {
  76     self->options.is_allocated= false;
  77   }
  78
  79   self->options.is_initialized= true;
  80
  81   return self;
  82 }
  83
  84 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  85                                                   memcached_server_write_instance_st self,
  86                                                   const char *hostname, in_port_t port,
  87                                                   uint32_t weight, memcached_connection_t type)
  88 {
  89   self= _server_create(self, memc);
  90
  91   if (self == NULL)
  92     return NULL;
  93
  94   _server_init(self, memc, hostname, port, weight, type);
  95
  96
  97   if (type == MEMCACHED_CONNECTION_UDP)
  98   {
  99     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 100     memcached_io_init_udp_header(self, 0);
 101   }
 102
 103   return self;
 104 }
 105
 106 void memcached_server_free(memcached_server_st *self)
 107 {
 108   memcached_quit_server(self, false);
 109
 110   if (self->cached_server_error)
 111     free(self->cached_server_error);
 112
 113   if (self->address_info)
 114     freeaddrinfo(self->address_info);
 115
 116   if (memcached_is_allocated(self))
 117   {
 118     libmemcached_free(self->root, self);
 119   }
 120   else
 121   {
 122     self->options.is_initialized= false;
 123   }
 124 }
 125
 126 /*
 127   If we do not have a valid object to clone from, we toss an error.
 128 */
 129 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 130                                             const memcached_server_st *source)
 131 {
 132   /* We just do a normal create if source is missing */
 133   if (source == NULL)
 134     return NULL;
 135
 136   destination= memcached_server_create_with(source->root, destination,
 137                                             source->hostname, source->port, source->weight,
 138                                             source->type);
 139   if (destination != NULL)
 140   {
 141     destination->cached_errno= source->cached_errno;
 142
 143     if (source->cached_server_error)
 144       destination->cached_server_error= strdup(source->cached_server_error);
 145   }
 146
 147   return destination;
 148
 149 }
 150
 151 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 152                                            const memcached_server_fn *callback,
 153                                            void *context,
 154                                            uint32_t number_of_callbacks)
 155 {
 156   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 157   {
 158     memcached_server_instance_st instance=
 159       memcached_server_instance_by_position(ptr, x);
 160
 161     for (uint32_t y= 0; y < number_of_callbacks; y++)
 162     {
 163       unsigned int iferror;
 164
 165       iferror= (*callback[y])(ptr, instance, context);
 166
 167       if (iferror)
 168         continue;
 169     }
 170   }
 171
 172   return MEMCACHED_SUCCESS;
 173 }
 174
 175 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 176                                                      const char *key,
 177                                                      size_t key_length,
 178                                                      memcached_return_t *error)
 179 {
 180   uint32_t server_key;
 181   memcached_server_instance_st instance;
 182
 183   *error= memcached_validate_key_length(key_length,
 184                                         ptr->flags.binary_protocol);
 185   unlikely (*error != MEMCACHED_SUCCESS)
 186     return NULL;
 187
 188   unlikely (memcached_server_count(ptr) == 0)
 189   {
 190     *error= MEMCACHED_NO_SERVERS;
 191     return NULL;
 192   }
 193
 194   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 195   {
 196     *error= MEMCACHED_BAD_KEY_PROVIDED;
 197     return NULL;
 198   }
 199
 200   server_key= memcached_generate_hash(ptr, key, key_length);
 201   instance= memcached_server_instance_by_position(ptr, server_key);
 202
 203   return instance;
 204
 205 }
 206
 207 void memcached_server_error_reset(memcached_server_st *ptr)
 208 {
 209   ptr->cached_server_error[0]= 0;
 210 }
 211
 212 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *ptr)
 213 {
 214   return ptr->last_disconnected_server;
 215 }
 216
 217 void memcached_server_list_free(memcached_server_list_st self)
 218 {
 219   if (self == NULL)
 220     return;
 221
 222   const memcached_st *root= self->root;
 223
 224   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 225   {
 226     if (self[x].address_info)
 227     {
 228       freeaddrinfo(self[x].address_info);
 229       self[x].address_info= NULL;
 230     }
 231   }
 232
 233   if (root)
 234   {
 235     libmemcached_free(root, self);
 236   }
 237   else
 238   {
 239     free(self);
 240   }
 241 }
 242
 243 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 244 {
 245   return servers->number_of_hosts= count;
 246 }
 247
 248 uint32_t memcached_server_count(const memcached_st *self)
 249 {
 250   return self->number_of_hosts;
 251 }
 252
 253 const char *memcached_server_name(memcached_server_instance_st self)
 254 {
 255   return self->hostname;
 256 }
 257
 258 in_port_t memcached_server_port(memcached_server_instance_st self)
 259 {
 260   return self->port;
 261 }
 262
 263 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 264 {
 265   return self->cursor_active;
 266 }
 267
 268 const char *memcached_server_error(memcached_server_instance_st ptr)
 269 {
 270   return ptr
 271     ?  ptr->cached_server_error
 272     : NULL;
 273 }
 274