git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/memcached_auto.c

   1 #include "common.h"
   2
   3 static memcached_return memcached_auto(memcached_st *ptr,
   4                                        char *verb,
   5                                        char *key, size_t key_length,
   6                                        unsigned int offset,
   7                                        uint64_t *value)
   8 {
   9   size_t send_length;
  10   memcached_return rc;
  11   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  12   unsigned int server_key;
  13
  14   unlikely (key_length == 0)
  15     return MEMCACHED_NO_KEY_PROVIDED;
  16
  17   unlikely (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  18     return MEMCACHED_NO_SERVERS;
  19
  20   if ((ptr->flags & MEM_VERIFY_KEY) && (memcachd_key_test(&key, &key_length, 1) == MEMCACHED_BAD_KEY_PROVIDED))
  21     return MEMCACHED_BAD_KEY_PROVIDED;
  22
  23   server_key= memcached_generate_hash(ptr, key, key_length);
  24
  25   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  26                         "%s %.*s %u\r\n", verb,
  27                         (int)key_length, key,
  28                         offset);
  29   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  30     return MEMCACHED_WRITE_FAILURE;
  31
  32   rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
  33   if (rc != MEMCACHED_SUCCESS)
  34     return rc;
  35
  36   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  37
  38   /*
  39     So why recheck responce? Because the protocol is brain dead :)
  40     The number returned might end up equaling one of the string
  41     values. Less chance of a mistake with strncmp() so we will
  42     use it. We still called memcached_response() though since it
  43     worked its magic for non-blocking IO.
  44   */
  45   if (!strncmp(buffer, "ERROR\r\n", 7))
  46   {
  47     *value= 0;
  48     rc= MEMCACHED_PROTOCOL_ERROR;
  49   }
  50   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  51   {
  52     *value= 0;
  53     rc= MEMCACHED_NOTFOUND;
  54   }
  55   else
  56   {
  57     *value= (uint64_t)strtoll(buffer, (char **)NULL, 10);
  58     rc= MEMCACHED_SUCCESS;
  59   }
  60
  61   return rc;
  62 }
  63
  64 memcached_return memcached_increment(memcached_st *ptr,
  65                                      char *key, size_t key_length,
  66                                      uint32_t offset,
  67                                      uint64_t *value)
  68 {
  69   memcached_return rc;
  70
  71   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
  72   rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
  73   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
  74
  75   return rc;
  76 }
  77
  78 memcached_return memcached_decrement(memcached_st *ptr,
  79                                      char *key, size_t key_length,
  80                                      uint32_t offset,
  81                                      uint64_t *value)
  82 {
  83   memcached_return rc;
  84
  85   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
  86   rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
  87   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
  88
  89   return rc;
  90 }