git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_storage.c

   1 /*
   2   Memcached library
   3
   4   memcached_set()
   5   memcached_replace()
   6   memcached_add()
   7
   8 */
   9
  10 #include "common.h"
  11 #include "memcached_io.h"
  12
  13 static memcached_return memcached_send(memcached_st *ptr,
  14                                        char *key, size_t key_length,
  15                                        char *value, size_t value_length,
  16                                        time_t expiration,
  17                                        uint16_t  flags,
  18                                        char *verb)
  19 {
  20   size_t write_length;
  21   ssize_t sent_length;
  22   memcached_return rc;
  23   char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
  24   unsigned int server_key;
  25
  26   assert(value);
  27   assert(value_length);
  28
  29   memset(buffer, 0, MEMCACHED_DEFAULT_COMMAND_SIZE);
  30
  31   rc= memcached_connect(ptr);
  32   if (rc != MEMCACHED_SUCCESS)
  33     return rc;
  34
  35   /* Leaveing this assert in since only a library fubar could blow this */
  36   assert(ptr->write_buffer_offset == 0);
  37
  38   server_key= memcached_generate_hash(key, key_length) % ptr->number_of_hosts;
  39
  40   write_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE,
  41                         "%s %.*s %x %llu %zu\r\n", verb,
  42                         (int)key_length, key, flags,
  43                         (unsigned long long)expiration, value_length);
  44   if (write_length >= MEMCACHED_DEFAULT_COMMAND_SIZE)
  45   {
  46     rc= MEMCACHED_WRITE_FAILURE;
  47     goto error;
  48   }
  49
  50   if ((sent_length= memcached_io_write(ptr, server_key, buffer, write_length)) == -1)
  51   {
  52     rc= MEMCACHED_WRITE_FAILURE;
  53     goto error;
  54   }
  55
  56   /*
  57     We have to flush after sending the command. Memcached is not smart enough
  58     to just keep reading from the socket :(
  59   */
  60   if ((sent_length= memcached_io_flush(ptr, server_key)) == -1)
  61     return MEMCACHED_WRITE_FAILURE;
  62
  63   if ((sent_length= memcached_io_write(ptr, server_key, value, value_length)) == -1)
  64   {
  65     rc= MEMCACHED_WRITE_FAILURE;
  66     goto error;
  67   }
  68
  69   if ((sent_length= memcached_io_write(ptr, server_key, "\r\n", 2)) == -1)
  70   {
  71     rc= MEMCACHED_WRITE_FAILURE;
  72     goto error;
  73   }
  74
  75   if ((sent_length= memcached_io_flush(ptr, server_key)) == -1)
  76     return MEMCACHED_WRITE_FAILURE;
  77
  78   rc= memcached_response(ptr, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, server_key);
  79
  80   if (rc == MEMCACHED_STORED)
  81     return MEMCACHED_SUCCESS;
  82   else
  83     return rc;
  84
  85 error:
  86   memcached_io_reset(ptr, server_key);
  87
  88   return rc;
  89 }
  90
  91 memcached_return memcached_set(memcached_st *ptr, char *key, size_t key_length,
  92                                char *value, size_t value_length,
  93                                time_t expiration,
  94                                uint16_t  flags)
  95 {
  96   memcached_return rc;
  97   LIBMEMCACHED_MEMCACHED_SET_START();
  98   rc= memcached_send(ptr, key, key_length, value, value_length,
  99                          expiration, flags, "set");
 100   LIBMEMCACHED_MEMCACHED_SET_END();
 101   return rc;
 102 }
 103
 104 memcached_return memcached_add(memcached_st *ptr, char *key, size_t key_length,
 105                                char *value, size_t value_length,
 106                                time_t expiration,
 107                                uint16_t  flags)
 108 {
 109   memcached_return rc;
 110   LIBMEMCACHED_MEMCACHED_ADD_START();
 111   rc= memcached_send(ptr, key, key_length, value, value_length,
 112                          expiration, flags, "add");
 113   LIBMEMCACHED_MEMCACHED_ADD_END();
 114   return rc;
 115 }
 116
 117 memcached_return memcached_replace(memcached_st *ptr, char *key, size_t key_length,
 118                                    char *value, size_t value_length,
 119                                    time_t expiration,
 120                                    uint16_t  flags)
 121 {
 122   memcached_return rc;
 123   LIBMEMCACHED_MEMCACHED_REPLACE_START();
 124   rc= memcached_send(ptr, key, key_length, value, value_length,
 125                          expiration, flags, "replace");
 126   LIBMEMCACHED_MEMCACHED_REPLACE_END();
 127   return rc;
 128 }