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

   1 #include "common.h"
   2
   3 static memcached_return memcached_auto(memcached_st *ptr,
   4                                        const char *verb,
   5                                        const 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((char **)&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%.*s %u\r\n", verb,
  27                         ptr->prefix_key,
  28                         (int)key_length, key,
  29                         offset);
  30   unlikely (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  31     return MEMCACHED_WRITE_FAILURE;
  32
  33   rc= memcached_do(&ptr->hosts[server_key], buffer, send_length, 1);
  34   if (rc != MEMCACHED_SUCCESS)
  35     return rc;
  36
  37   rc= memcached_response(&ptr->hosts[server_key], buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
  38
  39   /*
  40     So why recheck responce? Because the protocol is brain dead :)
  41     The number returned might end up equaling one of the string
  42     values. Less chance of a mistake with strncmp() so we will
  43     use it. We still called memcached_response() though since it
  44     worked its magic for non-blocking IO.
  45   */
  46   if (!strncmp(buffer, "ERROR\r\n", 7))
  47   {
  48     *value= 0;
  49     rc= MEMCACHED_PROTOCOL_ERROR;
  50   }
  51   else if (!strncmp(buffer, "NOT_FOUND\r\n", 11))
  52   {
  53     *value= 0;
  54     rc= MEMCACHED_NOTFOUND;
  55   }
  56   else
  57   {
  58     *value= (uint64_t)strtoll(buffer, (char **)NULL, 10);
  59     rc= MEMCACHED_SUCCESS;
  60   }
  61
  62   return rc;
  63 }
  64
  65 memcached_return memcached_increment(memcached_st *ptr,
  66                                      const char *key, size_t key_length,
  67                                      uint32_t offset,
  68                                      uint64_t *value)
  69 {
  70   memcached_return rc;
  71
  72   LIBMEMCACHED_MEMCACHED_INCREMENT_START();
  73   rc= memcached_auto(ptr, "incr", key, key_length, offset, value);
  74   LIBMEMCACHED_MEMCACHED_INCREMENT_END();
  75
  76   return rc;
  77 }
  78
  79 memcached_return memcached_decrement(memcached_st *ptr,
  80                                      const char *key, size_t key_length,
  81                                      uint32_t offset,
  82                                      uint64_t *value)
  83 {
  84   memcached_return rc;
  85
  86   LIBMEMCACHED_MEMCACHED_DECREMENT_START();
  87   rc= memcached_auto(ptr, "decr", key, key_length, offset, value);
  88   LIBMEMCACHED_MEMCACHED_DECREMENT_END();
  89
  90   return rc;
  91 }