git.m6w6.name Git - m6w6/libmemcached/blob - 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_st *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->weight= weight ? weight : 1; // 1 is the default weight value
  58   self->io_wait_count.read= 0;
  59   self->io_wait_count.write= 0;
  60   self->io_wait_count.timeouts= 0;
  61   self->io_wait_count._bytes_read= 0;
  62   self->major_version= UINT8_MAX;
  63   self->micro_version= UINT8_MAX;
  64   self->minor_version= UINT8_MAX;
  65   self->type= type;
  66   self->error_messages= NULL;
  67
  68   self->state= MEMCACHED_SERVER_STATE_NEW;
  69   self->next_retry= 0;
  70
  71   self->root= root;
  72   if (root)
  73   {
  74     self->version= ++root->server_info.version;
  75   }
  76   else
  77   {
  78     self->version= UINT_MAX;
  79   }
  80   self->limit_maxbytes= 0;
  81   memcpy(self->hostname, hostname.c_str, hostname.size);
  82   self->hostname[hostname.size]= 0;
  83 }
  84
  85 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  86 {
  87   if (self == NULL)
  88   {
  89    self= libmemcached_xmalloc(memc, struct memcached_server_st);
  90
  91     if (self == NULL)
  92     {
  93       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
  94     }
  95
  96     self->options.is_allocated= true;
  97   }
  98   else
  99   {
 100     self->options.is_allocated= false;
 101   }
 102
 103   self->options.is_initialized= true;
 104
 105   return self;
 106 }
 107
 108 memcached_server_st *__server_create_with(memcached_st *memc,
 109                                           memcached_server_st* allocated_instance,
 110                                           const memcached_string_t& hostname,
 111                                           const in_port_t port,
 112                                           uint32_t weight,
 113                                           const memcached_connection_t type)
 114 {
 115   if (memcached_is_valid_servername(hostname) == false)
 116   {
 117     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 118     return NULL;
 119   }
 120
 121   allocated_instance= _server_create(allocated_instance, memc);
 122
 123   if (allocated_instance == NULL)
 124   {
 125     return NULL;
 126   }
 127
 128   _server_init(allocated_instance, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 129
 130   return allocated_instance;
 131 }
 132
 133 void __server_free(memcached_server_st *self)
 134 {
 135   memcached_error_free(*self);
 136
 137   if (memcached_is_allocated(self))
 138   {
 139     libmemcached_free(self->root, self);
 140   }
 141   else
 142   {
 143     self->options.is_initialized= false;
 144   }
 145 }
 146
 147 void memcached_server_free(memcached_server_st *self)
 148 {
 149   if (self == NULL)
 150   {
 151     return;
 152   }
 153
 154   if (memcached_server_list_count(self))
 155   {
 156     memcached_server_list_free(self);
 157     return;
 158   }
 159
 160   __server_free(self);
 161 }
 162
 163 void memcached_server_error_reset(memcached_server_st *self)
 164 {
 165   WATCHPOINT_ASSERT(self);
 166   if (self == NULL)
 167   {
 168     return;
 169   }
 170
 171   memcached_error_free(*self);
 172 }
 173
 174 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 175 {
 176   WATCHPOINT_ASSERT(servers);
 177   if (servers == NULL)
 178   {
 179     return 0;
 180   }
 181
 182   return servers->number_of_hosts= count;
 183 }
 184
 185 uint32_t memcached_server_count(const memcached_st *self)
 186 {
 187   WATCHPOINT_ASSERT(self);
 188   if (self == NULL)
 189     return 0;
 190
 191   return self->number_of_hosts;
 192 }
 193
 194 const char *memcached_server_name(const memcached_server_instance_st self)
 195 {
 196   WATCHPOINT_ASSERT(self);
 197   if (self == NULL)
 198     return NULL;
 199
 200   return self->hostname;
 201 }
 202
 203 in_port_t memcached_server_port(const memcached_server_instance_st self)
 204 {
 205   WATCHPOINT_ASSERT(self);
 206   if (self == NULL)
 207   {
 208     return 0;
 209   }
 210
 211   return self->port();
 212 }
 213
 214 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 215 {
 216   WATCHPOINT_ASSERT(self);
 217   if (self == NULL)
 218   {
 219     return 0;
 220   }
 221
 222   return self->cursor_active_;
 223 }
 224
 225 const char *memcached_server_type(const memcached_server_instance_st ptr)
 226 {
 227   if (ptr)
 228   {
 229     switch (ptr->type)
 230     {
 231     case MEMCACHED_CONNECTION_TCP:
 232       return "TCP";
 233
 234     case MEMCACHED_CONNECTION_UDP:
 235       return "UDP";
 236
 237     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 238       return "SOCKET";
 239     }
 240   }
 241
 242   return "UNKNOWN";
 243 }
 244
 245 uint8_t memcached_server_major_version(const memcached_server_instance_st instance)
 246 {
 247   if (instance)
 248   {
 249     return instance->major_version;
 250   }
 251
 252   return UINT8_MAX;
 253 }
 254
 255 uint8_t memcached_server_minor_version(const memcached_server_instance_st instance)
 256 {
 257   if (instance)
 258   {
 259     return instance->minor_version;
 260   }
 261
 262   return UINT8_MAX;
 263 }
 264
 265 uint8_t memcached_server_micro_version(const memcached_server_instance_st instance)
 266 {
 267   if (instance)
 268   {
 269     return instance->micro_version;
 270   }
 271
 272   return UINT8_MAX;
 273 }