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