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                                        uint64_t *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   if (key_length == 0)
  15     return MEMCACHED_NO_KEY_PROVIDED;
  16
  17   if (ptr->hosts == NULL || ptr->number_of_hosts == 0)
  18     return MEMCACHED_NO_SERVERS;
  19
  20   server_key= memcached_generate_hash(ptr, key, key_length);
  21
  22   if ((rc= memcached_connect(ptr, server_key)) != MEMCACHED_SUCCESS)
  23     return rc;
  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   if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  30     return MEMCACHED_WRITE_FAILURE;
  31   sent_length= memcached_io_write(ptr, server_key, buffer, send_length, 1);
  32
  33   if (sent_length == -1 || sent_length != send_length)
  34     return MEMCACHED_WRITE_FAILURE;
  35
  36   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  37
  38   rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  39
  40   /*
  41     So why recheck responce? Because the protocol is brain dead :)
  42     The number returned might end up equaling one of the string
  43     values. Less chance of a mistake with memcmp() so we will
  44     use it. We still called memcached_response() though since it
  45     worked its magic for non-blocking IO.
  46   */
  47   if (!memcmp(buffer, "ERROR\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  48   {
  49     *value= 0;
  50     rc= MEMCACHED_PROTOCOL_ERROR;
  51   }
  52   else if (!memcmp(buffer, "NOT_FOUND\r\n", MEMCACHED_DEFAULT_COMMAND_SIZE))
  53   {
  54     *value= 0;
  55     rc= MEMCACHED_NOTFOUND;
  56   }
  57   else
  58   {
  59     *value= (uint64_t)strtoll(buffer, (char **)NULL, 10);
  60     rc= MEMCACHED_SUCCESS;
  61   }
  62
  63   return rc;
  64 }
  65
  66 memcached_return memcached_increment(memcached_st *ptr,
  67                                      char *key, size_t key_length,
  68                                      unsigned int offset,
  69                                      uint64_t *value)
  70 {
  71   memcached_return rc;
  72
  73   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
  74   rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
  75   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
  76
  77   return rc;
  78 }
  79
  80 memcached_return memcached_decrement(memcached_st *ptr,
  81                                      char *key, size_t key_length,
  82                                      unsigned int offset,
  83                                      uint64_t *value)
  84 {
  85   memcached_return rc;
  86
  87   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
  88   rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
  89   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
  90
  91   return rc;
  92 }