git.m6w6.name Git - m6w6/libmemcached/blob - lib/memcached_storage.c

   1 /*
   2   Memcached library
   3
   4   memcached_set()
   5   memcached_replace()
   6   memcached_add()
   7
   8 */
   9
  10 #include <memcached.h>
  11
  12 static memcached_return memcached_send(memcached_st *ptr,
  13                                        char *key, size_t key_length,
  14                                        char *value, size_t value_length,
  15                                        time_t expiration,
  16                                        uint16_t  flags,
  17                                        char *verb)
  18 {
  19   size_t write_length;
  20   ssize_t sent_length;
  21   memcached_return rc;
  22   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  23   unsigned int server_key;
  24
  25   rc= memcached_connect(ptr);
  26   assert(value);
  27   assert(value_length);
  28
  29   if (rc != MEMCACHED_SUCCESS)
  30     return rc;
  31
  32   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
  33
  34   write_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  35                         "%s %.*s %x %llu %zu\r\n", verb,
  36                         (int)key_length, key, flags,
  37                         (unsigned long long)expiration, value_length);
  38   if (write_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  39     return MEMCACHED_WRITE_FAILURE;
  40   if ((sent_length= write(ptr->hosts[server_key].fd, buffer, write_length)) == -1)
  41     return MEMCACHED_WRITE_FAILURE;
  42   assert(write_length == sent_length);
  43
  44   if ((sent_length= write(ptr->hosts[server_key].fd, value, value_length)) == -1)
  45     return MEMCACHED_WRITE_FAILURE;
  46   assert(value_length == sent_length);
  47
  48   if ((sent_length= write(ptr->hosts[server_key].fd, "\r\n", 2)) == -1)
  49     return MEMCACHED_WRITE_FAILURE;
  50   assert(2 == sent_length);
  51
  52   sent_length= read(ptr->hosts[server_key].fd, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE);
  53
  54   if (sent_length && buffer[0] == 'S')  /* STORED */
  55     return MEMCACHED_SUCCESS;
  56   else if (write_length && buffer[0] == 'N')  /* NOT_STORED */
  57     return MEMCACHED_NOTSTORED;
  58   else
  59     return MEMCACHED_READ_FAILURE;
  60 }
  61
  62 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
  63                                char *value, size_t value_length,
  64                                time_t expiration,
  65                                uint16_t  flags)
  66 {
  67   return  memcached_send(ptr, key, key_length, value, value_length,
  68                          expiration, flags, "set");
  69 }
  70
  71 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
  72                                char *value, size_t value_length,
  73                                time_t expiration,
  74                                uint16_t  flags)
  75 {
  76   return  memcached_send(ptr, key, key_length, value, value_length,
  77                          expiration, flags, "add");
  78 }
  79
  80 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
  81                                    char *value, size_t value_length,
  82                                    time_t expiration,
  83                                    uint16_t  flags)
  84 {
  85   return  memcached_send(ptr, key, key_length, value, value_length,
  86                          expiration, flags, "replace");
  87 }