git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_delete.c

   1 #include "common.h"
   2
   3 memcached_return memcached_delete(memcached_st *ptr, char *key, size_t key_length,
   4                                   time_t expiration)
   5 {
   6   return memcached_delete_by_key(ptr, key, key_length,
   7                                  key, key_length, expiration);
   8 }
   9
  10 memcached_return memcached_delete_by_key(memcached_st *ptr,
  11                                          char *master_key, size_t master_key_length,
  12                                          char *key, size_t key_length,
  13                                          time_t expiration)
  14 {
  15   char to_write;
  16   size_t send_length;
  17   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  18   unsigned int server_key;
  19   uint8_t replicas= 0;
  20   memcached_return rc[MEMCACHED_MAX_REPLICAS];
  21
  22   if (key_length == 0)
  23     return MEMCACHED_NO_KEY_PROVIDED;
  24
  25   if (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  26     return MEMCACHED_NO_SERVERS;
  27
  28   server_key= memcached_generate_hash(ptr, master_key, master_key_length);
  29
  30   if (expiration)
  31     send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  32                           "delete %.*s %llu\r\n", (int)key_length, key,
  33                           (unsigned long long)expiration);
  34   else
  35     send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  36                           "delete %.*s\r\n", (int)key_length, key);
  37
  38   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  39   {
  40     rc[replicas]= MEMCACHED_WRITE_FAILURE;
  41     goto error;
  42   }
  43
  44   to_write= (ptr->flags & MEM_BUFFER_REQUESTS) ? 0 : 1;
  45
  46   do
  47   {
  48     rc[replicas]= memcached_do(&ptr->hosts[server_key], buffer, send_length, to_write);
  49     if (rc[replicas] != MEMCACHED_SUCCESS)
  50       goto error;
  51
  52     if ((ptr->flags & MEM_BUFFER_REQUESTS))
  53     {
  54       rc[replicas]= MEMCACHED_BUFFERED;
  55     }
  56     else
  57     {
  58       rc[replicas]= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  59       if (rc[replicas] == MEMCACHED_DELETED)
  60         rc[replicas]= MEMCACHED_SUCCESS;
  61     }
  62
  63     /* On error we just jump to the next potential server */
  64 error:
  65     if (replicas > 1 && ptr->distribution == MEMCACHED_DISTRIBUTION_CONSISTENT)
  66     {
  67       if (server_key == (ptr->number_of_hosts - 1))
  68         server_key= 0;
  69       else
  70         server_key++;
  71     }
  72   } while ((++replicas) < ptr->number_of_replicas);
  73
  74   /* As long as one object gets stored, we count this as a success */
  75   while (replicas--)
  76   {
  77     if (rc[replicas] == MEMCACHED_DELETED)
  78       return MEMCACHED_SUCCESS;
  79     else if (rc[replicas] == MEMCACHED_DELETED)
  80       rc[replicas]= MEMCACHED_BUFFERED;
  81   }
  82
  83   return rc[0];
  84 }