git.m6w6.name Git - m6w6/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   if (ptr->number_of_hosts)
  55   {
  56     qsort(ptr->hosts, ptr->number_of_hosts, sizeof(memcached_server_st), compare_servers);
  57     ptr->hosts[0].count= ptr->number_of_hosts;
  58   }
  59 }
  60
  61 static void host_reset(memcached_st *ptr, memcached_server_st *host,
  62                        char *hostname, unsigned int port,
  63                        memcached_connection type)
  64 {
  65   memset(host,  0, sizeof(memcached_server_st));
  66   strncpy(host->hostname, hostname, MEMCACHED_MAX_HOST_LENGTH - 1);
  67   host->root= ptr ? ptr : NULL;
  68   host->port= port;
  69   host->fd= -1;
  70   host->type= type;
  71   host->read_ptr= host->read_buffer;
  72   if (ptr)
  73     host->next_retry= ptr->retry_timeout;
  74   host->sockaddr_inited= MEMCACHED_NOT_ALLOCATED;
  75 }
  76
  77 void server_list_free(memcached_st *ptr, memcached_server_st *servers)
  78 {
  79   unsigned int x;
  80
  81   if (servers == NULL)
  82     return;
  83
  84   for (x= 0; x < servers->count; x++)
  85     if (servers[x].address_info)
  86       freeaddrinfo(servers[x].address_info);
  87
  88   if (ptr && ptr->call_free)
  89     ptr->call_free(ptr, servers);
  90   else
  91     free(servers);
  92 }
  93
  94 memcached_return memcached_server_push(memcached_st *ptr, memcached_server_st *list)
  95 {
  96   unsigned int x;
  97   uint16_t count;
  98   memcached_server_st *new_host_list;
  99
 100   if (!list)
 101     return MEMCACHED_SUCCESS;
 102
 103   count= list[0].count;
 104
 105   if (ptr->call_realloc)
 106     new_host_list=
 107       (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 108                                                sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 109   else
 110     new_host_list=
 111       (memcached_server_st *)realloc(ptr->hosts,
 112                                      sizeof(memcached_server_st) * (count + ptr->number_of_hosts));
 113
 114   if (!new_host_list)
 115     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 116
 117   ptr->hosts= new_host_list;
 118
 119   for (x= 0; x < count; x++)
 120   {
 121     WATCHPOINT_ASSERT(list[x].hostname[0] != 0);
 122     host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], list[x].hostname,
 123                list[x].port, list[x].type);
 124     ptr->number_of_hosts++;
 125   }
 126   ptr->hosts[0].count= ptr->number_of_hosts;
 127
 128   if (ptr->flags & MEM_USE_SORT_HOSTS)
 129     sort_hosts(ptr);
 130
 131   rebalance_wheel(ptr);
 132
 133   return MEMCACHED_SUCCESS;
 134 }
 135
 136 memcached_return memcached_server_add_unix_socket(memcached_st *ptr, char *filename)
 137 {
 138   if (!filename)
 139     return MEMCACHED_FAILURE;
 140
 141   return server_add(ptr, filename, 0, MEMCACHED_CONNECTION_UNIX_SOCKET);
 142 }
 143
 144 memcached_return memcached_server_add_udp(memcached_st *ptr,
 145                                           char *hostname,
 146                                           unsigned int port)
 147 {
 148   if (!port)
 149     port= MEMCACHED_DEFAULT_PORT;
 150
 151   if (!hostname)
 152     hostname= "localhost";
 153
 154   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_UDP);
 155 }
 156
 157 memcached_return memcached_server_add(memcached_st *ptr,
 158                                       char *hostname,
 159                                       unsigned int port)
 160 {
 161   if (!port)
 162     port= MEMCACHED_DEFAULT_PORT;
 163
 164   if (!hostname)
 165     hostname= "localhost";
 166
 167   return server_add(ptr, hostname, port, MEMCACHED_CONNECTION_TCP);
 168 }
 169
 170 static memcached_return server_add(memcached_st *ptr, char *hostname,
 171                                    unsigned int port,
 172                                    memcached_connection type)
 173 {
 174   memcached_server_st *new_host_list;
 175   LIBMEMCACHED_MEMCACHED_SERVER_ADD_START();
 176
 177
 178   if (ptr->call_realloc)
 179     new_host_list= (memcached_server_st *)ptr->call_realloc(ptr, ptr->hosts,
 180                                                             sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 181   else
 182     new_host_list= (memcached_server_st *)realloc(ptr->hosts,
 183                                                   sizeof(memcached_server_st) * (ptr->number_of_hosts+1));
 184   if (new_host_list == NULL)
 185     return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 186
 187   ptr->hosts= new_host_list;
 188
 189   host_reset(ptr, &ptr->hosts[ptr->number_of_hosts], hostname, port, type);
 190   ptr->number_of_hosts++;
 191
 192   if (ptr->flags & MEM_USE_SORT_HOSTS)
 193     sort_hosts(ptr);
 194
 195   ptr->hosts[0].count= ptr->number_of_hosts;
 196
 197   rebalance_wheel(ptr);
 198
 199   LIBMEMCACHED_MEMCACHED_SERVER_ADD_END();
 200
 201   return MEMCACHED_SUCCESS;
 202 }
 203
 204 memcached_server_st *memcached_server_list_append(memcached_server_st *ptr,
 205                                                   char *hostname, unsigned int port,
 206                                                   memcached_return *error)
 207 {
 208   unsigned int count;
 209   memcached_server_st *new_host_list;
 210
 211   if (hostname == NULL || error == NULL)
 212     return NULL;
 213
 214   if (!port)
 215     port= MEMCACHED_DEFAULT_PORT;
 216
 217   /* Increment count for hosts */
 218   count= 1;
 219   if (ptr != NULL)
 220   {
 221     count+= ptr[0].count;
 222   }
 223
 224   new_host_list= (memcached_server_st *)realloc(ptr, sizeof(memcached_server_st) * count);
 225   if (!new_host_list)
 226   {
 227     *error= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
 228     return NULL;
 229   }
 230
 231   host_reset(NULL, &new_host_list[count-1], hostname, port, MEMCACHED_CONNECTION_TCP);
 232
 233   /* Backwards compatibility hack */
 234   new_host_list[0].count= count;
 235
 236   *error= MEMCACHED_SUCCESS;
 237   return new_host_list;
 238 }
 239
 240 unsigned int memcached_server_list_count(memcached_server_st *ptr)
 241 {
 242   if (ptr == NULL)
 243     return 0;
 244
 245   return ptr[0].count;
 246 }
 247
 248 void memcached_server_list_free(memcached_server_st *ptr)
 249 {
 250   server_list_free(NULL, ptr);
 251 }