git.m6w6.name Git - m6w6/libmemcached/blob - lib/memcached_hosts.c

   1 #include <memcached.h>
   2 #include "common.h"
   3
   4 /* Protoypes (static) */
   5 static memcached_return server_add(memcached_st *ptr, char *hostname,
   6                                    unsigned int port,
   7                                    memcached_connection type);
   8
   9 #define MEMCACHED_WHEEL_SIZE 1024
  10 #define MEMCACHED_STRIDE 4
  11 static void rebalance_wheel(memcached_st *ptr)
  12 {
  13   unsigned int x;
  14   unsigned int y;
  15   unsigned int latch;
  16
  17   /* Seed the Wheel */
  18   memset(ptr->wheel, 0, sizeof(unsigned int) * MEMCACHED_WHEEL_SIZE);
  19
  20   for (latch= y= x= 0; x < MEMCACHED_WHEEL_SIZE; x++, latch++)
  21   {
  22     if (latch == MEMCACHED_STRIDE)
  23     {
  24       y++;
  25       if (y == ptr->number_of_hosts)
  26         y= 0;
  27       latch= 0;
  28     }
  29
  30     ptr->wheel[x]= y;
  31   }
  32 }
  33
  34 static void host_reset(memcached_server_st *host, char *hostname, unsigned int port,
  35                        memcached_connection type)
  36 {
  37   memset(host,  0, sizeof(memcached_server_st));
  38   strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
  39   host->port= port;
  40   host->fd= -1;
  41   host->type= type;
  42   host->read_ptr= host->read_buffer;
  43   host->write_ptr= host->write_buffer;
  44   host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
  45 }
  46
  47 void server_list_free(memcached_st *ptr, memcached_server_st *servers)
  48 {
  49   unsigned int x;
  50
  51   if (servers == NULL)
  52     return;
  53
  54   for (x= 0; x < servers->count; x++)
  55     if (servers[x].address_info)
  56       freeaddrinfo(servers[x].address_info);
  57
  58   if (ptr && ptr->call_free)
  59     ptr->call_free(ptr, servers);
  60   else
  61     free(servers);
  62 }
  63
  64 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  65 {
  66   unsigned int x;
  67   uint16_t count;
  68   memcached_server_st *new_host_list;
  69
  70   if (!list)
  71     return MEMCACHED_SUCCESS;
  72
  73   count= list[0].count;
  74
  75   if (ptr->call_realloc)
  76     new_host_list=
  77       (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
  78                                                sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
  79   else
  80     new_host_list=
  81       (memcached_server_st *)realloc(ptr->hosts,
  82                                      sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
  83
  84   if (!new_host_list)
  85     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  86
  87   ptr->hosts= new_host_list;
  88
  89   for (x= 0; x < count; x++)
  90   {
  91     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
  92     host_reset(&ptr->hosts[ptr->number_of_hosts], list[x].hostname,
  93                list[x].port, list[x].type);
  94     ptr->number_of_hosts++;
  95   }
  96   ptr->hosts[0].count= ptr->number_of_hosts;
  97
  98   rebalance_wheel(ptr);
  99
 100   return MEMCACHED_SUCCESS;
 101 }
 102
 103 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
 104 {
 105   if (!filename)
 106     return MEMCACHED_FAILURE;
 107
 108   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
 109 }
 110
 111 memcached_return memcached_server_add_udp(memcached_st *ptr,
 112                                           char *hostname,
 113                                           unsigned int port)
 114 {
 115   if (!port)
 116     port= MEMCACHED_DEFAULT_PORT;
 117
 118   if (!hostname)
 119     hostname= "localhost";
 120
 121   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 122 }
 123
 124 memcached_return memcached_server_add(memcached_st *ptr,
 125                                       char *hostname,
 126                                       unsigned int port)
 127 {
 128   if (!port)
 129     port= MEMCACHED_DEFAULT_PORT;
 130
 131   if (!hostname)
 132     hostname= "localhost";
 133
 134   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 135 }
 136
 137 static memcached_return server_add(memcached_st *ptr, char *hostname,
 138                                    unsigned int port,
 139                                    memcached_connection type)
 140 {
 141   memcached_server_st *new_host_list;
 142   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 143
 144
 145   if (ptr->call_realloc)
 146     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 147                                                             sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 148   else
 149     new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 150                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 151   if (new_host_list == NULL)
 152     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 153
 154   ptr->hosts= new_host_list;
 155
 156   host_reset(&ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 157   ptr->number_of_hosts++;
 158   ptr->hosts[0].count++;
 159
 160   rebalance_wheel(ptr);
 161
 162   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 163
 164   return MEMCACHED_SUCCESS;
 165 }
 166
 167 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 168                                                   char *hostname, unsigned int port,
 169                                                   memcached_return *error)
 170 {
 171   unsigned int count;
 172   memcached_server_st *new_host_list;
 173
 174   if (hostname == NULL || error == NULL)
 175     return NULL;
 176
 177   if (!port)
 178     port= MEMCACHED_DEFAULT_PORT;
 179
 180   /* Increment count for hosts */
 181   count= 1;
 182   if (ptr != NULL)
 183   {
 184     count+= ptr[0].count;
 185   }
 186
 187   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 188   if (!new_host_list)
 189   {
 190     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 191     return NULL;
 192   }
 193
 194   host_reset(&new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 195   new_host_list[0].count++;
 196
 197
 198   *error= MEMCACHED_SUCCESS;
 199   return new_host_list;
 200 }
 201
 202 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 203 {
 204   if (ptr == NULL)
 205     return 0;
 206
 207   return ptr[0].count;
 208 }
 209
 210 void memcached_server_list_free(memcached_server_st *ptr)
 211 {
 212   server_list_free(NULL, ptr);
 213 }