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->fd= INVALID_SOCKET;
  54   self->io_bytes_sent= 0;
  55   self->request_id= 0;
  56   self->server_failure_counter= 0;
  57   self->server_failure_counter_query_id= 0;
  58   self->weight= weight ? weight : 1; // 1 is the default weight value
  59   self->io_wait_count.read= 0;
  60   self->io_wait_count.write= 0;
  61   self->io_wait_count.timeouts= 0;
  62   self->io_wait_count._bytes_read= 0;
  63   self->major_version= UINT8_MAX;
  64   self->micro_version= UINT8_MAX;
  65   self->minor_version= UINT8_MAX;
  66   self->type= type;
  67   self->error_messages= NULL;
  68   self->read_ptr= self->read_buffer;
  69   self->read_buffer_length= 0;
  70   self->read_data_length= 0;
  71   self->write_buffer_offset= 0;
  72   self->address_info= NULL;
  73   self->address_info_next= NULL;
  74
  75   self->state= MEMCACHED_SERVER_STATE_NEW;
  76   self->next_retry= 0;
  77
  78   self->root= root;
  79   if (root)
  80   {
  81     self->version= ++root->server_info.version;
  82   }
  83   else
  84   {
  85     self->version= UINT_MAX;
  86   }
  87   self->limit_maxbytes= 0;
  88   memcpy(self->hostname, hostname.c_str, hostname.size);
  89   self->hostname[hostname.size]= 0;
  90 }
  91
  92 static memcached_server_st *_server_create(memcached_server_st *self, const memcached_st *memc)
  93 {
  94   if (self == NULL)
  95   {
  96    self= libmemcached_xmalloc(memc, struct memcached_server_st);
  97
  98     if (self == NULL)
  99     {
 100       return NULL; /*  MEMCACHED_MEMORY_ALLOCATION_FAILURE */
 101     }
 102
 103     self->options.is_allocated= true;
 104   }
 105   else
 106   {
 107     self->options.is_allocated= false;
 108   }
 109
 110   self->options.is_initialized= true;
 111
 112   return self;
 113 }
 114
 115 memcached_server_st *__server_create_with(memcached_st *memc,
 116                                           memcached_server_st* self,
 117                                           const memcached_string_t& hostname,
 118                                           const in_port_t port,
 119                                           uint32_t weight,
 120                                           const memcached_connection_t type)
 121 {
 122   if (memcached_is_valid_servername(hostname) == false)
 123   {
 124     memcached_set_error(*memc, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("Invalid hostname provided"));
 125     return NULL;
 126   }
 127
 128   self= _server_create(self, memc);
 129
 130   if (self == NULL)
 131   {
 132     return NULL;
 133   }
 134
 135   _server_init(self, const_cast<memcached_st *>(memc), hostname, port, weight, type);
 136
 137   return self;
 138 }
 139
 140 void __server_free(memcached_server_st *self)
 141 {
 142   memcached_error_free(*self);
 143
 144   if (memcached_is_allocated(self))
 145   {
 146     libmemcached_free(self->root, self);
 147   }
 148   else
 149   {
 150     self->options.is_initialized= false;
 151   }
 152 }
 153
 154 void memcached_server_free(memcached_server_st *self)
 155 {
 156   if (self == NULL)
 157   {
 158     return;
 159   }
 160
 161   if (memcached_server_list_count(self))
 162   {
 163     memcached_server_list_free(self);
 164     return;
 165   }
 166
 167   __server_free(self);
 168 }
 169
 170 void memcached_server_error_reset(memcached_server_st *self)
 171 {
 172   WATCHPOINT_ASSERT(self);
 173   if (self == NULL)
 174   {
 175     return;
 176   }
 177
 178   memcached_error_free(*self);
 179 }
 180
 181 uint32_t memcached_servers_set_count(memcached_server_st *servers, uint32_t count)
 182 {
 183   WATCHPOINT_ASSERT(servers);
 184   if (servers == NULL)
 185   {
 186     return 0;
 187   }
 188
 189   return servers->number_of_hosts= count;
 190 }
 191
 192 uint32_t memcached_server_count(const memcached_st *self)
 193 {
 194   WATCHPOINT_ASSERT(self);
 195   if (self == NULL)
 196     return 0;
 197
 198   return self->number_of_hosts;
 199 }
 200
 201 const char *memcached_server_name(const memcached_server_instance_st self)
 202 {
 203   WATCHPOINT_ASSERT(self);
 204   if (self == NULL)
 205     return NULL;
 206
 207   return self->hostname;
 208 }
 209
 210 in_port_t memcached_server_port(const memcached_server_instance_st self)
 211 {
 212   WATCHPOINT_ASSERT(self);
 213   if (self == NULL)
 214   {
 215     return 0;
 216   }
 217
 218   return self->port;
 219 }
 220
 221 uint32_t memcached_server_response_count(const memcached_server_instance_st self)
 222 {
 223   WATCHPOINT_ASSERT(self);
 224   if (self == NULL)
 225   {
 226     return 0;
 227   }
 228
 229   return self->cursor_active;
 230 }
 231
 232 const char *memcached_server_type(const memcached_server_instance_st ptr)
 233 {
 234   if (ptr)
 235   {
 236     switch (ptr->type)
 237     {
 238     case MEMCACHED_CONNECTION_TCP:
 239       return "TCP";
 240
 241     case MEMCACHED_CONNECTION_UDP:
 242       return "UDP";
 243
 244     case MEMCACHED_CONNECTION_UNIX_SOCKET:
 245       return "SOCKET";
 246     }
 247   }
 248
 249   return "UNKNOWN";
 250 }
 251
 252 uint8_t memcached_server_major_version(const memcached_server_instance_st instance)
 253 {
 254   if (instance)
 255   {
 256     return instance->major_version;
 257   }
 258
 259   return UINT8_MAX;
 260 }
 261
 262 uint8_t memcached_server_minor_version(const memcached_server_instance_st instance)
 263 {
 264   if (instance)
 265   {
 266     return instance->minor_version;
 267   }
 268
 269   return UINT8_MAX;
 270 }
 271
 272 uint8_t memcached_server_micro_version(const memcached_server_instance_st instance)
 273 {
 274   if (instance)
 275   {
 276     return instance->micro_version;
 277   }
 278
 279   return UINT8_MAX;
 280 }