git.m6w6.name Git - awesomized/libmemcached/blob - src/libmemcached/server.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 /*
  39   This is a partial implementation for fetching/creating memcached_server_st objects.
  40 */
  41 #include <libmemcached/common.h>
  42
  43 static inline void _server_init(memcached_server_st *self, Memcached *root,
  44                                 const memcached_string_t& hostname,
  45                                 in_port_t port,
  46                                 uint32_t weight, memcached_connection_t type)
  47 {
  48   self->options.is_shutting_down= false;
  49   self->options.is_dead= false;
  50   self->number_of_hosts= 0;
  51   self->cursor_active= 0;
  52   self->port= port;
  53   self->io_bytes_sent= 0;
  54   self->request_id= 0;
  55   self->server_failure_counter= 0;
  56   self->server_failure_counter_query_id= 0;
  57   self->server_timeout_counter= 0;
  58   self->server_timeout_counter_query_id= 0;
  59   self->weight= weight ? weight : 1; // 1 is the default weight value
  60   self->io_wait_count.read= 0;
  61   self->io_wait_count.write= 0;
  62   self->io_wait_count.timeouts= 0;
  63   self->io_wait_count._bytes_read= 0;
  64   self->major_version= UINT8_MAX;
  65   self->micro_version= UINT8_MAX;
  66   self->minor_version= UINT8_MAX;
  67   self->type= type;
  68   self->error_messages= NULL;
  69
  70   self->state= MEMCACHED_SERVER_STATE_NEW;
  71   self->next_retry= 0;
  72
  73   self->root= root;
  74   if (root)
  75   {
  76     self->version= ++root->server_info.version;
  77   }
  78   else
  79   {
  80     self->version= UINT_MAX;
  81   }
  82   self->limit_maxbytes= 0;
  83   memcpy(self->hostname, hostname.c_str, hostname.size);
  84   self->hostname[hostname.size]= 0;
  85 }
  86
  87 static memcached_server_st *_server_create(memcached_server_st *self, const Memcached *memc)
  88 {
  89   if (self == NULL)
  90   {
  91    self= libmemcached_xmalloc(memc, struct memcached_server_st);
  92
  93     if (self == NULL)
  94     {
  95       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  96     }
  97
  98     self->options.is_allocated= true;
  99   }
 100   else
 101   {
 102     self->options.is_allocated= false;
 103   }
 104
 105   self->options.is_initialized= true;
 106
 107   return self;
 108 }
 109
 110 memcached_server_st *__server_create_with(Memcached *memc,
 111                                           memcached_server_st* allocated_instance,
 112                                           const memcached_string_t& hostname,
 113                                           const in_port_t port,
 114                                           uint32_t weight,
 115                                           const memcached_connection_t type)
 116 {
 117   if (memcached_is_valid_servername(hostname) == false)
 118   {
 119     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 120     return NULL;
 121   }
 122
 123   allocated_instance= _server_create(allocated_instance, memc);
 124
 125   if (allocated_instance == NULL)
 126   {
 127     return NULL;
 128   }
 129
 130   _server_init(allocated_instance, const_cast<Memcached *>(memc), hostname, port, weight, type);
 131
 132   return allocated_instance;
 133 }
 134
 135 void __server_free(memcached_server_st *self)
 136 {
 137   memcached_error_free(*self);
 138
 139   if (memcached_is_allocated(self))
 140   {
 141     libmemcached_free(self->root, self);
 142   }
 143   else
 144   {
 145     self->options.is_initialized= false;
 146   }
 147 }
 148
 149 void memcached_server_free(memcached_server_st *self)
 150 {
 151   if (self == NULL)
 152   {
 153     return;
 154   }
 155
 156   if (memcached_server_list_count(self))
 157   {
 158     memcached_server_list_free(self);
 159     return;
 160   }
 161
 162   __server_free(self);
 163 }
 164
 165 void memcached_server_error_reset(memcached_server_st *self)
 166 {
 167   WATCHPOINT_ASSERT(self);
 168   if (self == NULL)
 169   {
 170     return;
 171   }
 172
 173   memcached_error_free(*self);
 174 }
 175
 176 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 177 {
 178   WATCHPOINT_ASSERT(servers);
 179   if (servers == NULL)
 180   {
 181     return 0;
 182   }
 183
 184   return servers->number_of_hosts= count;
 185 }
 186
 187 uint32_t memcached_server_count(const memcached_st *self)
 188 {
 189   WATCHPOINT_ASSERT(self);
 190   if (self == NULL)
 191     return 0;
 192
 193   return self->number_of_hosts;
 194 }
 195
 196 const char *memcached_server_name(const memcached_instance_st * self)
 197 {
 198   WATCHPOINT_ASSERT(self);
 199   if (self)
 200   {
 201     return self->_hostname;
 202   }
 203
 204   return NULL;
 205 }
 206
 207 in_port_t memcached_server_port(const memcached_instance_st * self)
 208 {
 209   WATCHPOINT_ASSERT(self);
 210   if (self == NULL)
 211   {
 212     return 0;
 213   }
 214
 215   return self->port();
 216 }
 217
 218 in_port_t memcached_server_srcport(const memcached_instance_st * self)
 219 {
 220   WATCHPOINT_ASSERT(self);
 221   if (self == NULL || self->fd == INVALID_SOCKET || (self->type != MEMCACHED_CONNECTION_TCP && self->type != MEMCACHED_CONNECTION_UDP))
 222   {
 223     return 0;
 224   }
 225
 226   struct sockaddr_in sin;
 227   socklen_t addrlen= sizeof(sin);
 228   if (getsockname(self->fd, (struct sockaddr*)&sin, &addrlen) != -1)
 229   {
 230     return ntohs(sin.sin_port);
 231   }
 232
 233   return -1;
 234 }
 235
 236 uint32_t memcached_server_response_count(const memcached_instance_st * self)
 237 {
 238   WATCHPOINT_ASSERT(self);
 239   if (self == NULL)
 240   {
 241     return 0;
 242   }
 243
 244   return self->cursor_active_;
 245 }
 246
 247 const char *memcached_server_type(const memcached_instance_st * ptr)
 248 {
 249   if (ptr)
 250   {
 251     switch (ptr->type)
 252     {
 253     case MEMCACHED_CONNECTION_TCP:
 254       return "TCP";
 255
 256     case MEMCACHED_CONNECTION_UDP:
 257       return "UDP";
 258
 259     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 260       return "SOCKET";
 261     }
 262   }
 263
 264   return "UNKNOWN";
 265 }
 266
 267 uint8_t memcached_server_major_version(const memcached_instance_st * instance)
 268 {
 269   if (instance)
 270   {
 271     return instance->major_version;
 272   }
 273
 274   return UINT8_MAX;
 275 }
 276
 277 uint8_t memcached_server_minor_version(const memcached_instance_st * instance)
 278 {
 279   if (instance)
 280   {
 281     return instance->minor_version;
 282   }
 283
 284   return UINT8_MAX;
 285 }
 286
 287 uint8_t memcached_server_micro_version(const memcached_instance_st * instance)
 288 {
 289   if (instance)
 290   {
 291     return instance->micro_version;
 292   }
 293
 294   return UINT8_MAX;
 295 }