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_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 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  48 {
  49   unsigned int x;
  50   uint16_t count;
  51   memcached_server_st *new_host_list;
  52
  53   if (!list)
  54     return MEMCACHED_SUCCESS;
  55
  56   count= list[0].count;
  57
  58   new_host_list=
  59     (memcached_server_st *)realloc(ptr->hosts,
  60                                    sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
  61
  62   if (!new_host_list)
  63     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  64
  65   ptr->hosts= new_host_list;
  66
  67   for (x= 0; x < count; x++)
  68   {
  69     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
  70     host_reset(&ptr->hosts[ptr->number_of_hosts], list[x].hostname,
  71                list[x].port, list[x].type);
  72     ptr->number_of_hosts++;
  73   }
  74   ptr->hosts[0].count= ptr->number_of_hosts;
  75
  76   rebalance_wheel(ptr);
  77
  78   return MEMCACHED_SUCCESS;
  79 }
  80
  81 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
  82 {
  83   if (!filename)
  84     return MEMCACHED_FAILURE;
  85
  86   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
  87 }
  88
  89 memcached_return memcached_server_add_udp(memcached_st *ptr,
  90                                           char *hostname,
  91                                           unsigned int port)
  92 {
  93   if (!port)
  94     port= MEMCACHED_DEFAULT_PORT;
  95
  96   if (!hostname)
  97     hostname= "localhost";
  98
  99   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 100 }
 101
 102 memcached_return memcached_server_add(memcached_st *ptr,
 103                                       char *hostname,
 104                                       unsigned int port)
 105 {
 106   if (!port)
 107     port= MEMCACHED_DEFAULT_PORT;
 108
 109   if (!hostname)
 110     hostname= "localhost";
 111
 112   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 113 }
 114
 115 static memcached_return server_add(memcached_st *ptr, char *hostname,
 116                                    unsigned int port,
 117                                    memcached_connection type)
 118 {
 119   memcached_server_st *new_host_list;
 120   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 121
 122
 123   new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 124                                                 sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 125   if (!new_host_list)
 126     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 127
 128   ptr->hosts= new_host_list;
 129
 130   host_reset(&ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 131   ptr->number_of_hosts++;
 132   ptr->hosts[0].count++;
 133
 134   rebalance_wheel(ptr);
 135
 136   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 137
 138   return MEMCACHED_SUCCESS;
 139 }
 140
 141 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 142                                                   char *hostname, unsigned int port,
 143                                                   memcached_return *error)
 144 {
 145   unsigned int count;
 146   memcached_server_st *new_host_list;
 147
 148   if (hostname == NULL || error == NULL)
 149     return NULL;
 150
 151   if (!port)
 152     port= MEMCACHED_DEFAULT_PORT;
 153
 154   /* Increment count for hosts */
 155   count= 1;
 156   if (ptr != NULL)
 157   {
 158     count+= ptr[0].count;
 159   }
 160
 161   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 162   if (!new_host_list)
 163   {
 164     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 165     return NULL;
 166   }
 167
 168   host_reset(&new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 169   new_host_list[0].count++;
 170
 171
 172   *error= MEMCACHED_SUCCESS;
 173   return new_host_list;
 174 }
 175
 176 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 177 {
 178   if (ptr == NULL)
 179     return 0;
 180
 181   return ptr[0].count;
 182 }
 183
 184 void memcached_server_list_free(memcached_server_st *ptr)
 185 {
 186   unsigned int x;
 187
 188   if (ptr == NULL)
 189     return;
 190
 191   for (x= 0; x < ptr->count; x++)
 192     if (ptr[x].address_info)
 193       freeaddrinfo(ptr[x].address_info);
 194
 195   free(ptr);
 196 }