git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/do.cc

   1 /* LibMemcached
   2  * Copyright (C) 2006-2010 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary:
   9  *
  10  */
  11
  12 #include <libmemcached/common.h>
  13
  14 memcached_return_t memcached_do(memcached_server_write_instance_st ptr,
  15                                 const void *command,
  16                                 size_t command_length,
  17                                 bool with_flush)
  18 {
  19   assert_msg(command_length, "Programming error, somehow a command had a length of zero");
  20   assert_msg(command, "Programming error, somehow a command was NULL");
  21
  22   libmemcached_io_vector_st vector[1]= { { command, command_length } };
  23
  24   return memcached_vdo(ptr, vector, 1, with_flush);
  25 }
  26
  27 memcached_return_t memcached_vdo(memcached_server_write_instance_st ptr,
  28                                  const struct libmemcached_io_vector_st *vector,
  29                                  size_t count,
  30                                  bool with_flush)
  31 {
  32   memcached_return_t rc;
  33
  34   WATCHPOINT_ASSERT(count);
  35   WATCHPOINT_ASSERT(vector);
  36
  37   if (memcached_failed(rc= memcached_connect(ptr)))
  38   {
  39     WATCHPOINT_ERROR(rc);
  40     assert_msg(ptr->error_messages, "memcached_connect() returned an error but the memcached_server_write_instance_st showed none.");
  41     return rc;
  42   }
  43
  44   /*
  45   ** Since non buffering ops in UDP mode dont check to make sure they will fit
  46   ** before they start writing, if there is any data in buffer, clear it out,
  47   ** otherwise we might get a partial write.
  48   **/
  49   if (memcached_is_udp(ptr->root) and with_flush and ptr->write_buffer_offset > UDP_DATAGRAM_HEADER_LENGTH)
  50   {
  51     if (memcached_io_write(ptr, NULL, 0, true) == -1)
  52     {
  53       memcached_io_reset(ptr);
  54       return memcached_set_error(*ptr, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  55     }
  56   }
  57
  58   ssize_t sent_length= memcached_io_writev(ptr, vector, count, with_flush);
  59
  60   size_t command_length= 0;
  61   for (uint32_t x= 0; x < count; ++x, vector++)
  62   {
  63     command_length+= vector->length;
  64   }
  65
  66   if (sent_length == -1 or size_t(sent_length) != command_length)
  67   {
  68     rc= MEMCACHED_WRITE_FAILURE;
  69     WATCHPOINT_ERROR(rc);
  70     WATCHPOINT_ERRNO(errno);
  71   }
  72   else if ((ptr->root->flags.no_reply) == 0)
  73   {
  74     memcached_server_response_increment(ptr);
  75   }
  76
  77   return rc;
  78 }