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