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

   1 #include "common.h"
   2
   3 /* Protoypes (static) */
   4 static memcached_return server_add(memcached_st *ptr, char *hostname,
   5                                    unsigned int port,
   6                                    memcached_connection type);
   7
   8 #define MEMCACHED_WHEEL_SIZE 1024
   9 #define MEMCACHED_STRIDE 4
  10 static void rebalance_wheel(memcached_st *ptr)
  11 {
  12   unsigned int x;
  13   unsigned int y;
  14   unsigned int latch;
  15
  16   /* Seed the Wheel */
  17   memset(ptr->wheel, 0, sizeof(unsigned int) * MEMCACHED_WHEEL_SIZE);
  18
  19   for (latch= y= x= 0; x < MEMCACHED_WHEEL_SIZE; x++, latch++)
  20   {
  21     if (latch == MEMCACHED_STRIDE)
  22     {
  23       y++;
  24       if (y == ptr->number_of_hosts)
  25         y= 0;
  26       latch= 0;
  27     }
  28
  29     ptr->wheel[x]= y;
  30   }
  31 }
  32
  33 static int compare_servers(const void *p1, const void *p2)
  34 {
  35   int return_value;
  36   memcached_server_st *a= (memcached_server_st *)p1;
  37   memcached_server_st *b= (memcached_server_st *)p2;
  38
  39   return_value= strcmp(a->hostname, b->hostname);
  40
  41   if (return_value == 0)
  42   {
  43     return_value= (int) (a->port - b->port);
  44   }
  45
  46   return return_value;
  47 }
  48
  49 void sort_hosts(memcached_st *ptr)
  50 {
  51   if (ptr->number_of_hosts)
  52   {
  53     qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
  54     ptr->hosts[0].count= ptr->number_of_hosts;
  55   }
  56 }
  57
  58 static void host_reset(memcached_st *ptr, memcached_server_st *host,
  59                        char *hostname, unsigned int port,
  60                        memcached_connection type)
  61 {
  62   memset(host,  0, sizeof(memcached_server_st));
  63   strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
  64   host->root= ptr ? ptr : NULL;
  65   host->port= port;
  66   host->fd= -1;
  67   host->type= type;
  68   host->read_ptr= host->read_buffer;
  69   if (ptr)
  70     host->next_retry= ptr->retry_timeout;
  71   host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
  72 }
  73
  74 void server_list_free(memcached_st *ptr, memcached_server_st *servers)
  75 {
  76   unsigned int x;
  77
  78   if (servers == NULL)
  79     return;
  80
  81   for (x= 0; x < servers->count; x++)
  82     if (servers[x].address_info)
  83       freeaddrinfo(servers[x].address_info);
  84
  85   if (ptr && ptr->call_free)
  86     ptr->call_free(ptr, servers);
  87   else
  88     free(servers);
  89 }
  90
  91 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  92 {
  93   unsigned int x;
  94   uint16_t count;
  95   memcached_server_st *new_host_list;
  96
  97   if (!list)
  98     return MEMCACHED_SUCCESS;
  99
 100   count= list[0].count;
 101
 102   if (ptr->call_realloc)
 103     new_host_list=
 104       (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 105                                                sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 106   else
 107     new_host_list=
 108       (memcached_server_st *)realloc(ptr->hosts,
 109                                      sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 110
 111   if (!new_host_list)
 112     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 113
 114   ptr->hosts= new_host_list;
 115
 116   for (x= 0; x < count; x++)
 117   {
 118     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
 119     host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
 120                list[x].port, list[x].type);
 121     ptr->number_of_hosts++;
 122   }
 123   ptr->hosts[0].count= ptr->number_of_hosts;
 124
 125   if (ptr->flags & MEM_USE_SORT_HOSTS)
 126     sort_hosts(ptr);
 127
 128   rebalance_wheel(ptr);
 129
 130   return MEMCACHED_SUCCESS;
 131 }
 132
 133 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
 134 {
 135   if (!filename)
 136     return MEMCACHED_FAILURE;
 137
 138   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
 139 }
 140
 141 memcached_return memcached_server_add_udp(memcached_st *ptr,
 142                                           char *hostname,
 143                                           unsigned int port)
 144 {
 145   if (!port)
 146     port= MEMCACHED_DEFAULT_PORT;
 147
 148   if (!hostname)
 149     hostname= "localhost";
 150
 151   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 152 }
 153
 154 memcached_return memcached_server_add(memcached_st *ptr,
 155                                       char *hostname,
 156                                       unsigned int port)
 157 {
 158   if (!port)
 159     port= MEMCACHED_DEFAULT_PORT;
 160
 161   if (!hostname)
 162     hostname= "localhost";
 163
 164   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 165 }
 166
 167 static memcached_return server_add(memcached_st *ptr, char *hostname,
 168                                    unsigned int port,
 169                                    memcached_connection type)
 170 {
 171   memcached_server_st *new_host_list;
 172   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 173
 174
 175   if (ptr->call_realloc)
 176     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 177                                                             sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 178   else
 179     new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 180                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 181   if (new_host_list == NULL)
 182     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 183
 184   ptr->hosts= new_host_list;
 185
 186   host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 187   ptr->number_of_hosts++;
 188
 189   if (ptr->flags & MEM_USE_SORT_HOSTS)
 190     sort_hosts(ptr);
 191
 192   ptr->hosts[0].count= ptr->number_of_hosts;
 193
 194   rebalance_wheel(ptr);
 195
 196   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 197
 198   return MEMCACHED_SUCCESS;
 199 }
 200
 201 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 202                                                   char *hostname, unsigned int port,
 203                                                   memcached_return *error)
 204 {
 205   unsigned int count;
 206   memcached_server_st *new_host_list;
 207
 208   if (hostname == NULL || error == NULL)
 209     return NULL;
 210
 211   if (!port)
 212     port= MEMCACHED_DEFAULT_PORT;
 213
 214   /* Increment count for hosts */
 215   count= 1;
 216   if (ptr != NULL)
 217   {
 218     count+= ptr[0].count;
 219   }
 220
 221   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 222   if (!new_host_list)
 223   {
 224     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 225     return NULL;
 226   }
 227
 228   host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 229
 230   /* Backwards compatibility hack */
 231   new_host_list[0].count= count;
 232
 233   *error= MEMCACHED_SUCCESS;
 234   return new_host_list;
 235 }
 236
 237 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 238 {
 239   if (ptr == NULL)
 240     return 0;
 241
 242   return ptr[0].count;
 243 }
 244
 245 void memcached_server_list_free(memcached_server_st *ptr)
 246 {
 247   server_list_free(NULL, ptr);
 248 }