stream.py
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# GNU Mailutils -- a suite of utilities for electronic mail
# Copyright (C) 2009, 2010 Free Software Foundation, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General
# Public License along with this library. If not, see
# <http://www.gnu.org/licenses/>.
from mailutils.c_api import stream
from mailutils.error import StreamError
MU_STREAM_READ = 0x00000001
MU_STREAM_WRITE = 0x00000002
MU_STREAM_RDWR = 0x00000004
MU_STREAM_APPEND = 0x00000008
MU_STREAM_CREAT = 0x00000010
MU_STREAM_NONBLOCK = 0x00000020
MU_STREAM_NO_CHECK = 0x00000040
MU_STREAM_SEEKABLE = 0x00000080
MU_STREAM_NO_CLOSE = 0x00000100
MU_STREAM_ALLOW_LINKS = 0x00000200
MU_STREAM_NONLOCK = 0x00000400
MU_STREAM_QACCESS = 0x00000800
MU_STREAM_IRGRP = 0x00001000
MU_STREAM_IWGRP = 0x00002000
MU_STREAM_IROTH = 0x00004000
MU_STREAM_IWOTH = 0x00008000
MU_STREAM_IMASK = 0x0000F000
MU_STDIN_FD = 0
MU_STDOUT_FD = 1
MU_STDERR_FD = 2
class Stream:
__refcount = 0
def __init__ (self, stm=None):
if isinstance (stm, stream.StreamType):
self.stm = stm
else:
self.stm = stream.StreamType ()
self.__reference ()
self.read_count = 0
self.write_count = 0
def __del__ (self):
if self.__dereference ():
stream.destroy (self.stm)
del self.stm
def __reference (self):
self.__refcount += 1
def __dereference (self):
self.__refcount -= 1
return self.__refcount == 0
def open (self):
status = stream.open (self.stm)
if status:
raise StreamError (status)
def close (self):
status = stream.close (self.stm)
if status:
raise StreamError (status)
def flush (self):
status = stream.flush (self.stm)
if status:
raise StreamError (status)
def wait (self, wflags):
status = stream.wait (self.stm, wflags)
if status:
raise StreamError (status)
def read (self):
status, rbuf, self.read_count = stream.read (self.stm)
if status:
raise StreamError (status)
return rbuf
def write (self, wbuf, size=None):
if size == None:
size = len (wbuf)
status, self.write_count = stream.write (self.stm, wbuf, size)
if status:
raise StreamError (status)
def readline (self):
status, rbuf, self.read_count = stream.readline (self.stm)
if status:
raise StreamError (status)
return rbuf
class TcpStream (Stream):
def __init__ (self, host, port, flags=MU_STREAM_READ):
Stream.__init__ (self)
status = stream.tcp_stream_create (self.stm, host, port, flags)
if status:
raise StreamError (status)
class FileStream (Stream):
def __init__ (self, filename, flags=MU_STREAM_READ):
Stream.__init__ (self)
status = stream.file_stream_create (self.stm, filename, flags)
if status:
raise StreamError (status)
class StdioStream (Stream):
def __init__ (self, fd=MU_STDIN_FD, flags=MU_STREAM_READ):
Stream.__init__ (self)
status = stream.stdio_stream_create (self.stm, fd, flags)
if status:
raise StreamError (status)
class ProgStream (Stream):
def __init__ (self, progname, flags=MU_STREAM_READ):
Stream.__init__ (self)
status = stream.prog_stream_create (self.stm, progname, flags)
if status:
raise StreamError (status)