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= UINT8_MAX;
  36   self->micro_version= UINT8_MAX;
  37   self->minor_version= UINT8_MAX;
  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     if (self->root)
 119     {
 120       libmemcached_free(self->root, self);
 121     }
 122     else
 123     {
 124       free(self);
 125     }
 126   }
 127   else
 128   {
 129     self->options.is_initialized= false;
 130   }
 131 }
 132
 133 /*
 134   If we do not have a valid object to clone from, we toss an error.
 135 */
 136 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 137                                             const memcached_server_st *source)
 138 {
 139   /* We just do a normal create if source is missing */
 140   if (source == NULL)
 141     return NULL;
 142
 143   destination= memcached_server_create_with(source->root, destination,
 144                                             source->hostname, source->port, source->weight,
 145                                             source->type);
 146   if (destination != NULL)
 147   {
 148     destination->cached_errno= source->cached_errno;
 149
 150     if (source->cached_server_error)
 151       destination->cached_server_error= strdup(source->cached_server_error);
 152   }
 153
 154   return destination;
 155
 156 }
 157
 158 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 159                                            const memcached_server_fn *callback,
 160                                            void *context,
 161                                            uint32_t number_of_callbacks)
 162 {
 163   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 164   {
 165     memcached_server_instance_st instance=
 166       memcached_server_instance_by_position(ptr, x);
 167
 168     for (uint32_t y= 0; y < number_of_callbacks; y++)
 169     {
 170       unsigned int iferror;
 171
 172       iferror= (*callback[y])(ptr, instance, context);
 173
 174       if (iferror)
 175         continue;
 176     }
 177   }
 178
 179   return MEMCACHED_SUCCESS;
 180 }
 181
 182 memcached_return_t memcached_server_execute(memcached_st *ptr,
 183                                             memcached_server_execute_fn callback,
 184                                             void *context)
 185 {
 186   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 187   {
 188     memcached_server_write_instance_st instance=
 189       memcached_server_instance_fetch(ptr, x);
 190
 191     unsigned int iferror;
 192
 193     iferror= (*callback)(ptr, instance, context);
 194
 195     if (iferror)
 196       continue;
 197   }
 198
 199   return MEMCACHED_SUCCESS;
 200 }
 201
 202 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 203                                                      const char *key,
 204                                                      size_t key_length,
 205                                                      memcached_return_t *error)
 206 {
 207   uint32_t server_key;
 208   memcached_server_instance_st instance;
 209
 210   *error= memcached_validate_key_length(key_length,
 211                                         ptr->flags.binary_protocol);
 212   unlikely (*error != MEMCACHED_SUCCESS)
 213     return NULL;
 214
 215   unlikely (memcached_server_count(ptr) == 0)
 216   {
 217     *error= MEMCACHED_NO_SERVERS;
 218     return NULL;
 219   }
 220
 221   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 222   {
 223     *error= MEMCACHED_BAD_KEY_PROVIDED;
 224     return NULL;
 225   }
 226
 227   server_key= memcached_generate_hash(ptr, key, key_length);
 228   instance= memcached_server_instance_by_position(ptr, server_key);
 229
 230   return instance;
 231
 232 }
 233
 234 void memcached_server_error_reset(memcached_server_st *ptr)
 235 {
 236   ptr->cached_server_error[0]= 0;
 237 }
 238
 239 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *ptr)
 240 {
 241   return ptr->last_disconnected_server;
 242 }
 243
 244 void memcached_server_list_free(memcached_server_list_st self)
 245 {
 246   if (self == NULL)
 247     return;
 248
 249   const memcached_st *root= self->root;
 250
 251   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 252   {
 253     if (self[x].address_info)
 254     {
 255       freeaddrinfo(self[x].address_info);
 256       self[x].address_info= NULL;
 257     }
 258   }
 259
 260   if (root)
 261   {
 262     libmemcached_free(root, self);
 263   }
 264   else
 265   {
 266     free(self);
 267   }
 268 }
 269
 270 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 271 {
 272   return servers->number_of_hosts= count;
 273 }
 274
 275 uint32_t memcached_server_count(const memcached_st *self)
 276 {
 277   return self->number_of_hosts;
 278 }
 279
 280 const char *memcached_server_name(memcached_server_instance_st self)
 281 {
 282   return self->hostname;
 283 }
 284
 285 in_port_t memcached_server_port(memcached_server_instance_st self)
 286 {
 287   return self->port;
 288 }
 289
 290 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 291 {
 292   return self->cursor_active;
 293 }
 294
 295 const char *memcached_server_error(memcached_server_instance_st ptr)
 296 {
 297   return ptr
 298     ?  ptr->cached_server_error
 299     : NULL;
 300 }
 301