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 ((sent_length= write(ptr->hosts[server_key].fd, buffer, write_length)) == -1)
  39     return MEMCACHED_WRITE_FAILURE;
  40   assert(write_length == sent_length);
  41
  42   if ((sent_length= write(ptr->hosts[server_key].fd, value, value_length)) == -1)
  43     return MEMCACHED_WRITE_FAILURE;
  44   assert(value_length == sent_length);
  45
  46   if ((sent_length= write(ptr->hosts[server_key].fd, "\r\n", 2)) == -1)
  47     return MEMCACHED_WRITE_FAILURE;
  48   assert(2 == sent_length);
  49
  50   sent_length= read(ptr->hosts[server_key].fd, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE);
  51
  52   if (sent_length && buffer[0] == 'S')  /* STORED */
  53     return MEMCACHED_SUCCESS;
  54   else if (write_length && buffer[0] == 'N')  /* NOT_STORED */
  55     return MEMCACHED_NOTSTORED;
  56   else
  57     return MEMCACHED_READ_FAILURE;
  58 }
  59
  60 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
  61                                char *value, size_t value_length,
  62                                time_t expiration,
  63                                uint16_t  flags)
  64 {
  65   return  memcached_send(ptr, key, key_length, value, value_length,
  66                          expiration, flags, "set");
  67 }
  68
  69 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
  70                                char *value, size_t value_length,
  71                                time_t expiration,
  72                                uint16_t  flags)
  73 {
  74   return  memcached_send(ptr, key, key_length, value, value_length,
  75                          expiration, flags, "add");
  76 }
  77
  78 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
  79                                    char *value, size_t value_length,
  80                                    time_t expiration,
  81                                    uint16_t  flags)
  82 {
  83   return  memcached_send(ptr, key, key_length, value, value_length,
  84                          expiration, flags, "replace");
  85 }