#include <rados/librados.hpp>
#include <sstream>
#include <cstdio>
#include <sys/errno.h>

int main(int argc, char **argv)
{
  if (argc < 5)
  {
    fprintf(stdout, "Usage: %s CONFIGURATION_FILE POOL_NAME OBJ_NAME "
                    "ONE_EXISTING_XATTRIBUTE \n",
            argv[0]);

    return EINVAL;
  }

  librados::Rados rados;

  char *conf = argv[1];
  char *pool = argv[2];
  char *obj = argv[3];
  char *xattr = argv[4];

  rados.init(0);
  rados.conf_read_file(conf);
  rados.connect();

  librados::IoCtx ioctx;
  rados.ioctx_create(pool, ioctx);

  const size_t numXAttrs(5);
  librados::bufferlist buffs[numXAttrs];
  int xattrRets[numXAttrs];

  librados::ObjectReadOperation op;

  fprintf(stdout, "Ret codes before the op: \n");

  for (size_t i = 0; i < numXAttrs; i++)
  {
    xattrRets[i] = -1;
    fprintf(stdout, "  RET#%d: %d\n", i, xattrRets[i]);
  }

  fprintf(stdout, "\n--------\nData and ret codes after the op: \n");

  for (size_t i = 0; i < numXAttrs; i++)
  {
    std::stringstream stream;

    if (i == 0)
      stream << xattr;
    else
      stream << "nonexistent-xattr" << i;

    op.getxattr(stream.str().c_str(), &buffs[i], &xattrRets[i]);
  }

  ioctx.operate(obj, &op, 0);

  for (size_t i = 0; i < numXAttrs; i++)
  {
    librados::bufferlist *buff = &buffs[i];
    std::string value;

    if (buff->length() > 0)
      value = std::string(buff->c_str(), buff->length());

    fprintf(stdout, "  RET#%d: %s %d\n", i, value.c_str(), xattrRets[i]);
  }

  rados.shutdown();

  return 0;
}