RemoteFile Class Reference

#include <RemoteFile.h>

Inheritance diagram for RemoteFile:

Public Member Functions
	~RemoteFile (void)

Static Public Member Functions
static Storage *	get (int localfd, const std::string &name, char **cmd, int mode)
static int	local (const std::string &tmpdir, std::string &temp)

Protected Member Functions
virtual void	abort (void)
virtual void	close (void)
Protected Member Functions inherited from File
virtual void	attach (IOFD fd)
virtual void	create (const char *name, bool exclusive=false, int perms=0666)
virtual void	create (const std::string &name, bool exclusive=false, int perms=0666)
	File (void)
	File (IOFD fd, bool autoclose=true)
	File (const char *name, int flags=IOFlags::OpenRead, int perms=0666)
	File (const std::string &name, int flags=IOFlags::OpenRead, int perms=0666)
virtual void	flush (void)
virtual void	open (const char *name, int flags=IOFlags::OpenRead, int perms=0666)
virtual void	open (const std::string &name, int flags=IOFlags::OpenRead, int perms=0666)
virtual IOOffset	position (IOOffset offset, Relative whence=SET)
virtual bool	prefetch (const IOPosBuffer *what, IOSize n)
virtual IOSize	read (void *into, IOSize n)
virtual IOSize	read (void *into, IOSize n, IOOffset pos)
virtual IOSize	readv (IOBuffer *into, IOSize length)
virtual void	resize (IOOffset size)
virtual void	setAutoClose (bool closeit)
virtual IOOffset	size (void) const
virtual IOSize	write (const void *from, IOSize n)
virtual IOSize	write (const void *from, IOSize n, IOOffset pos)
virtual IOSize	writev (const IOBuffer *from, IOSize length)
	~File (void)
Protected Member Functions inherited from IOChannel
bool	sysclose (IOFD fd, int *error=0)
virtual IOFD	fd (void) const
virtual void	fd (IOFD value)
	IOChannel (IOFD fd=EDM_IOFD_INVALID)
virtual bool	isBlocking (void) const
virtual void	setBlocking (bool value)
virtual	~IOChannel (void)
Protected Member Functions inherited from IOInput
int	read (void)
IOSize	read (IOBuffer into)
IOSize	xread (IOBuffer into)
IOSize	xread (void *into, IOSize n)
IOSize	xreadv (IOBuffer *into, IOSize buffers)
virtual	~IOInput (void)
	Destruct the stream. A no-op. More...
Protected Member Functions inherited from IOOutput
IOSize	write (unsigned char byte)
IOSize	write (IOBuffer from)
IOSize	xwrite (const void *from, IOSize n)
IOSize	xwrite (IOBuffer from)
IOSize	xwritev (const IOBuffer *from, IOSize buffers)
virtual	~IOOutput (void)
	Destruct the stream. A no-op. More...
Protected Member Functions inherited from Storage
virtual bool	eof (void) const
virtual IOOffset	position (void) const
IOSize	read (IOBuffer into, IOOffset pos)
virtual IOSize	readv (IOPosBuffer *into, IOSize buffers)
virtual void	rewind (void)
	Storage (void)
IOSize	write (IOBuffer from, IOOffset pos)
virtual IOSize	writev (const IOPosBuffer *from, IOSize buffers)
virtual	~Storage (void)

Private Member Functions
	RemoteFile (IOFD fd, const std::string &name)
void	remove (void)

Private Attributes
std::string	name_

Detailed Description

Definition at line 7 of file RemoteFile.h.

Constructor & Destructor Documentation

RemoteFile::~RemoteFile ( void  )

inline

Definition at line 10 of file RemoteFile.h.

{ remove (); }

RemoteFile::RemoteFile ( IOFD  fd, const std::string &  name  )

private

Definition at line 37 of file RemoteFile.cc.

Referenced by get().

  : File (fd),
    name_ (name)
{}

Member Function Documentation

void RemoteFile::abort ( void  )

protectedvirtual

Close the file and ignore all errors.

Reimplemented from File.

Definition at line 51 of file RemoteFile.cc.

References File::abort().

{ remove(); File::abort (); }

void RemoteFile::close ( void  )

protectedvirtual

Close the file.

Reimplemented from File.

Definition at line 47 of file RemoteFile.cc.

References File::close().

Referenced by get(), python.Vispa.Gui.BoxContentDialog.BoxContentDialog::keyPressEvent(), and python.Vispa.Gui.FindDialog.FindDialog::keyPressEvent().

{ remove(); File::close (); }

Storage * RemoteFile::get ( int  localfd, const std::string &  name, char **  cmd, int  mode  )

static

Definition at line 90 of file RemoteFile.cc.

References close(), edm::hlt::Exception, join(), IOFlags::OpenCreate, IOFlags::OpenWrite, evf::utils::pid, RemoteFile(), and throwStorageError().

Referenced by Options.Options::__getitem__(), HttpStorageMaker::open(), and GsiFTPStorageMaker::open().

{
  // FIXME: On write, create a temporary local file open for write;
  // on close, trigger transfer to destination.  If opening existing
  // file for write, may need to first download.
  assert (! (mode & (IOFlags::OpenWrite | IOFlags::OpenCreate)));

  pid_t  pid = -1;
  int    rc = posix_spawnp (&pid, cmd[0], 0, 0, cmd, environ);

  if (rc == -1)
  {
    ::close (localfd);
    unlink (name.c_str());
    throwStorageError ("RemoteFile::get()", "posix_spawnp()", rc);
  }

  pid_t rcpid;
  do
    rcpid = waitpid(pid, &rc, 0);
  while (rcpid == (pid_t) -1 && errno == EINTR);

  if (rcpid == (pid_t) -1)
  {
    ::close (localfd);
    unlink (name.c_str());
    throwStorageError ("RemoteFile::get()", "waitpid()", errno);
  }

  if (WIFEXITED(rc) && WEXITSTATUS(rc) == 0)
    return new RemoteFile (localfd, name);
  else
  {
    ::close (localfd);
    unlink (name.c_str());
    throw cms::Exception("RemoteFile::get()")
      << "'" << join(cmd) << "'"
      << (WIFEXITED(rc) ? " exited with exit code "
      : WIFSIGNALED(rc) ? " died from signal "
      : " died for an obscure unknown reason with exit status ")
      << (WIFEXITED(rc) ? WEXITSTATUS(rc)
      : WIFSIGNALED(rc) ? WTERMSIG(rc)
      : rc);
  }
}

int RemoteFile::local ( const std::string &  tmpdir, std::string &  temp  )

static

Definition at line 55 of file RemoteFile.cc.

References IOChannel::fd(), and throwStorageError().

Referenced by GsiFTPStorageMaker::open(), and HttpStorageMaker::open().

{
  // Download temporary files to the current directory by default.
  // This is better for grid jobs as the current directory is
  // likely to have more space, and is more optimised for
  // large files, and is cleaned up after the job.
  if (tmpdir.empty () || tmpdir == ".")
  {
    size_t len = pathconf (".", _PC_PATH_MAX);
    char   *buf = (char *) malloc (len);
    getcwd (buf, len);

    temp.reserve (len + 32);
    temp = buf;
    free (buf);
  }
  else
  {
    temp.reserve (tmpdir.size() + 32);
    temp = tmpdir;
  }
  if (temp[temp.size()-1] != '/')
    temp += '/';

  temp += "storage-factory-local-XXXXXX";
  temp.c_str(); // null terminate for mkstemp

  int fd = mkstemp (&temp[0]);
  if (fd == -1)
    throwStorageError("RemoteFile::local()", "mkstemp()", errno);

  return fd;
}

void RemoteFile::remove ( void  )

private

Definition at line 43 of file RemoteFile.cc.

References name_.

{ unlink (name_.c_str()); }

Member Data Documentation

std::string RemoteFile::name_

private

Definition at line 23 of file RemoteFile.h.

Referenced by remove().