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 <libmemcached/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.is_shutting_down= false;
  22   self->options.is_dead= 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 ? weight : 1; // 1 is the default weight value
  31   WATCHPOINT_SET(self->io_wait_count.read= 0);
  32   WATCHPOINT_SET(self->io_wait_count.write= 0);
  33   self->major_version= UINT8_MAX;
  34   self->micro_version= UINT8_MAX;
  35   self->minor_version= UINT8_MAX;
  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   self->address_info_next= NULL;
  44
  45   if (root)
  46   {
  47     self->next_retry= root->retry_timeout;
  48   }
  49   else
  50   {
  51     self->next_retry= 0;
  52   }
  53
  54   if (self->weight > 1 && root)
  55   {
  56     ((memcached_st *)root)->ketama.weighted= true;
  57   }
  58
  59   self->root= root;
  60   self->limit_maxbytes= 0;
  61   if (hostname == NULL)
  62   {
  63     self->hostname[0]= 0;
  64   }
  65   else
  66   {
  67     strncpy(self->hostname, hostname, NI_MAXHOST - 1);
  68   }
  69 }
  70
  71 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  72 {
  73   if (self == NULL)
  74   {
  75    self= (memcached_server_st *)libmemcached_malloc(memc, sizeof(memcached_server_st));
  76
  77     if (! self)
  78       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  79
  80     self->options.is_allocated= true;
  81   }
  82   else
  83   {
  84     self->options.is_allocated= false;
  85   }
  86
  87   self->options.is_initialized= true;
  88
  89   return self;
  90 }
  91
  92 memcached_server_st *memcached_server_create_with(const memcached_st *memc,
  93                                                   memcached_server_write_instance_st self,
  94                                                   const char *hostname, in_port_t port,
  95                                                   uint32_t weight, memcached_connection_t type)
  96 {
  97   self= _server_create(self, memc);
  98
  99   if (self == NULL)
 100     return NULL;
 101
 102   _server_init(self, memc, hostname, port, weight, type);
 103
 104
 105   if (type == MEMCACHED_CONNECTION_UDP)
 106   {
 107     self->write_buffer_offset= UDP_DATAGRAM_HEADER_LENGTH;
 108     memcached_io_init_udp_header(self, 0);
 109   }
 110
 111   return self;
 112 }
 113
 114 void memcached_server_free(memcached_server_st *self)
 115 {
 116   memcached_quit_server(self, false);
 117
 118   if (self->cached_server_error)
 119     free(self->cached_server_error);
 120
 121   if (self->address_info)
 122     freeaddrinfo(self->address_info);
 123
 124   if (memcached_is_allocated(self))
 125   {
 126     if (self->root)
 127     {
 128       libmemcached_free(self->root, self);
 129     }
 130     else
 131     {
 132       free(self);
 133     }
 134   }
 135   else
 136   {
 137     self->options.is_initialized= false;
 138   }
 139 }
 140
 141 /*
 142   If we do not have a valid object to clone from, we toss an error.
 143 */
 144 memcached_server_st *memcached_server_clone(memcached_server_st *destination,
 145                                             const memcached_server_st *source)
 146 {
 147   /* We just do a normal create if source is missing */
 148   if (source == NULL)
 149     return NULL;
 150
 151   destination= memcached_server_create_with(source->root, destination,
 152                                             source->hostname, source->port, source->weight,
 153                                             source->type);
 154   if (destination != NULL)
 155   {
 156     destination->cached_errno= source->cached_errno;
 157
 158     if (source->cached_server_error)
 159       destination->cached_server_error= strdup(source->cached_server_error);
 160   }
 161
 162   return destination;
 163
 164 }
 165
 166 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
 167                                            const memcached_server_fn *callback,
 168                                            void *context,
 169                                            uint32_t number_of_callbacks)
 170 {
 171   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 172   {
 173     memcached_server_instance_st instance=
 174       memcached_server_instance_by_position(ptr, x);
 175
 176     for (uint32_t y= 0; y < number_of_callbacks; y++)
 177     {
 178       unsigned int iferror;
 179
 180       iferror= (*callback[y])(ptr, instance, context);
 181
 182       if (iferror)
 183         continue;
 184     }
 185   }
 186
 187   return MEMCACHED_SUCCESS;
 188 }
 189
 190 memcached_return_t memcached_server_execute(memcached_st *ptr,
 191                                             memcached_server_execute_fn callback,
 192                                             void *context)
 193 {
 194   for (uint32_t x= 0; x < memcached_server_count(ptr); x++)
 195   {
 196     memcached_server_write_instance_st instance=
 197       memcached_server_instance_fetch(ptr, x);
 198
 199     unsigned int iferror;
 200
 201     iferror= (*callback)(ptr, instance, context);
 202
 203     if (iferror)
 204       continue;
 205   }
 206
 207   return MEMCACHED_SUCCESS;
 208 }
 209
 210 memcached_server_instance_st memcached_server_by_key(const memcached_st *ptr,
 211                                                      const char *key,
 212                                                      size_t key_length,
 213                                                      memcached_return_t *error)
 214 {
 215   uint32_t server_key;
 216   memcached_server_instance_st instance;
 217
 218   *error= memcached_validate_key_length(key_length,
 219                                         ptr->flags.binary_protocol);
 220   unlikely (*error != MEMCACHED_SUCCESS)
 221     return NULL;
 222
 223   unlikely (memcached_server_count(ptr) == 0)
 224   {
 225     *error= MEMCACHED_NO_SERVERS;
 226     return NULL;
 227   }
 228
 229   if (ptr->flags.verify_key && (memcached_key_test((const char **)&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
 230   {
 231     *error= MEMCACHED_BAD_KEY_PROVIDED;
 232     return NULL;
 233   }
 234
 235   server_key= memcached_generate_hash(ptr, key, key_length);
 236   instance= memcached_server_instance_by_position(ptr, server_key);
 237
 238   return instance;
 239
 240 }
 241
 242 void memcached_server_error_reset(memcached_server_st *ptr)
 243 {
 244   ptr->cached_server_error[0]= 0;
 245 }
 246
 247 memcached_server_instance_st memcached_server_get_last_disconnect(const memcached_st *ptr)
 248 {
 249   return ptr->last_disconnected_server;
 250 }
 251
 252 void memcached_server_list_free(memcached_server_list_st self)
 253 {
 254   if (self == NULL)
 255     return;
 256
 257   for (uint32_t x= 0; x < memcached_server_list_count(self); x++)
 258   {
 259     if (self[x].address_info)
 260     {
 261       freeaddrinfo(self[x].address_info);
 262       self[x].address_info= NULL;
 263     }
 264   }
 265
 266   const memcached_st *root= self->root;
 267   if (root)
 268   {
 269     libmemcached_free(root, self);
 270   }
 271   else
 272   {
 273     free(self);
 274   }
 275 }
 276
 277 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 278 {
 279   return servers->number_of_hosts= count;
 280 }
 281
 282 uint32_t memcached_server_count(const memcached_st *self)
 283 {
 284   return self->number_of_hosts;
 285 }
 286
 287 const char *memcached_server_name(memcached_server_instance_st self)
 288 {
 289   return self->hostname;
 290 }
 291
 292 in_port_t memcached_server_port(memcached_server_instance_st self)
 293 {
 294   return self->port;
 295 }
 296
 297 uint32_t memcached_server_response_count(memcached_server_instance_st self)
 298 {
 299   return self->cursor_active;
 300 }
 301
 302 const char *memcached_server_error(memcached_server_instance_st ptr)
 303 {
 304   return ptr
 305     ?  ptr->cached_server_error
 306     : NULL;
 307 }
 308