git.m6w6.name Git - awesomized/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_st *ptr, memcached_server_st *host,
  35                        char *hostname, unsigned int port,
  36                        memcached_connection type)
  37 {
  38   memset(host,  0, sizeof(memcached_server_st));
  39   strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
  40   host->root= ptr ? ptr : NULL;
  41   host->port= port;
  42   host->fd= -1;
  43   host->type= type;
  44   host->read_ptr= host->read_buffer;
  45   host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
  46 }
  47
  48 void server_list_free(memcached_st *ptr, memcached_server_st *servers)
  49 {
  50   unsigned int x;
  51
  52   if (servers == NULL)
  53     return;
  54
  55   for (x= 0; x < servers->count; x++)
  56     if (servers[x].address_info)
  57       freeaddrinfo(servers[x].address_info);
  58
  59   if (ptr && ptr->call_free)
  60     ptr->call_free(ptr, servers);
  61   else
  62     free(servers);
  63 }
  64
  65 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  66 {
  67   unsigned int x;
  68   uint16_t count;
  69   memcached_server_st *new_host_list;
  70
  71   if (!list)
  72     return MEMCACHED_SUCCESS;
  73
  74   count= list[0].count;
  75
  76   if (ptr->call_realloc)
  77     new_host_list=
  78       (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
  79                                                sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
  80   else
  81     new_host_list=
  82       (memcached_server_st *)realloc(ptr->hosts,
  83                                      sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
  84
  85   if (!new_host_list)
  86     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  87
  88   ptr->hosts= new_host_list;
  89
  90   for (x= 0; x < count; x++)
  91   {
  92     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
  93     host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
  94                list[x].port, list[x].type);
  95     ptr->number_of_hosts++;
  96   }
  97   ptr->hosts[0].count= ptr->number_of_hosts;
  98
  99   rebalance_wheel(ptr);
 100
 101   return MEMCACHED_SUCCESS;
 102 }
 103
 104 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
 105 {
 106   if (!filename)
 107     return MEMCACHED_FAILURE;
 108
 109   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
 110 }
 111
 112 memcached_return memcached_server_add_udp(memcached_st *ptr,
 113                                           char *hostname,
 114                                           unsigned int port)
 115 {
 116   if (!port)
 117     port= MEMCACHED_DEFAULT_PORT;
 118
 119   if (!hostname)
 120     hostname= "localhost";
 121
 122   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 123 }
 124
 125 memcached_return memcached_server_add(memcached_st *ptr,
 126                                       char *hostname,
 127                                       unsigned int port)
 128 {
 129   if (!port)
 130     port= MEMCACHED_DEFAULT_PORT;
 131
 132   if (!hostname)
 133     hostname= "localhost";
 134
 135   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 136 }
 137
 138 static memcached_return server_add(memcached_st *ptr, char *hostname,
 139                                    unsigned int port,
 140                                    memcached_connection type)
 141 {
 142   memcached_server_st *new_host_list;
 143   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 144
 145
 146   if (ptr->call_realloc)
 147     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 148                                                             sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 149   else
 150     new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 151                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 152   if (new_host_list == NULL)
 153     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 154
 155   ptr->hosts= new_host_list;
 156
 157   host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 158   ptr->number_of_hosts++;
 159   ptr->hosts[0].count++;
 160
 161   rebalance_wheel(ptr);
 162
 163   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 164
 165   return MEMCACHED_SUCCESS;
 166 }
 167
 168 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 169                                                   char *hostname, unsigned int port,
 170                                                   memcached_return *error)
 171 {
 172   unsigned int count;
 173   memcached_server_st *new_host_list;
 174
 175   if (hostname == NULL || error == NULL)
 176     return NULL;
 177
 178   if (!port)
 179     port= MEMCACHED_DEFAULT_PORT;
 180
 181   /* Increment count for hosts */
 182   count= 1;
 183   if (ptr != NULL)
 184   {
 185     count+= ptr[0].count;
 186   }
 187
 188   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 189   if (!new_host_list)
 190   {
 191     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 192     return NULL;
 193   }
 194
 195   host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 196
 197   /* Backwards compatibility hack */
 198   new_host_list[0].count++;
 199
 200
 201   *error= MEMCACHED_SUCCESS;
 202   return new_host_list;
 203 }
 204
 205 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 206 {
 207   if (ptr == NULL)
 208     return 0;
 209
 210   return ptr[0].count;
 211 }
 212
 213 void memcached_server_list_free(memcached_server_st *ptr)
 214 {
 215   server_list_free(NULL, ptr);
 216 }