git.m6w6.name Git - awesomized/libmemcached/blob - lib/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                                        unsigned int *value)
   8 {
   9   size_t send_length, sent_length;
  10   memcached_return rc;
  11   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  12   unsigned int server_key;
  13
  14   rc= memcached_connect(ptr);
  15
  16   if (rc != MEMCACHED_SUCCESS)
  17     return rc;
  18
  19   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
  20
  21   send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  22                         "%s %.*s %u\r\n", verb,
  23                         (int)key_length, key,
  24                         offset);
  25   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  26     return MEMCACHED_WRITE_FAILURE;
  27   sent_length= send(ptr->hosts[server_key].fd, buffer, send_length, 0);
  28
  29   if (sent_length == -1 || sent_length != send_length)
  30     return MEMCACHED_WRITE_FAILURE;
  31
  32   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  33
  34   rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  35
  36   /*
  37     So why recheck responce? Because the protocol is brain dead :)
  38     The number returned might end up equaling one of the string
  39     values. Less chance of a mistake with memcmp() so we will
  40     use it. We still called memcached_response() though since it
  41     worked its magic for non-blocking IO.
  42   */
  43   if (!memcmp(buffer, "ERROR\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  44   {
  45     *value= 0;
  46     rc= MEMCACHED_PROTOCOL_ERROR;
  47   }
  48   else if (!memcmp(buffer, "NOT_FOUND\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  49   {
  50     *value= 0;
  51     rc= MEMCACHED_NOTFOUND;
  52   }
  53   else
  54   {
  55     *value= strtol(buffer, (char **)NULL, 10);
  56     rc= MEMCACHED_SUCCESS;
  57   }
  58
  59   return rc;
  60 }
  61
  62 memcached_return memcached_increment(memcached_st *ptr,
  63                                      char *key, size_t key_length,
  64                                      unsigned int offset,
  65                                      unsigned int *value)
  66 {
  67   memcached_return rc;
  68
  69   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
  70   rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
  71   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
  72
  73   return rc;
  74 }
  75
  76 memcached_return memcached_decrement(memcached_st *ptr,
  77                                      char *key, size_t key_length,
  78                                      unsigned int offset,
  79                                      unsigned int *value)
  80 {
  81   memcached_return rc;
  82
  83   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
  84   rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
  85   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
  86
  87   return rc;
  88 }