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#! /usr/bin/env python
#
# Copyright (C) 2005 Michael Urman
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import gtk, gobject, os, sys
__all__ = []
class Subprocess(gobject.GObject):
SIG_INT = (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (int,))
SIG_INTSTR = (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (int, str))
__gsignals__ = {
'output-line': SIG_INTSTR,
'output-chunk': SIG_INTSTR,
'output-eof': SIG_INT,
}
__gproperties__ = {
'newlines': (str, 'line splitters',
'these characters also case a line to be reported',
'\n', gobject.PARAM_READWRITE),
'process': (object, 'process', 'process name and arguments',
gobject.PARAM_READABLE),
'cmdname': (str, 'cmdname', 'command when name is overriden',
'', gobject.PARAM_READABLE),
'stdin' : (int, 'stdin', "child's stdin file descriptor",
-1, 0x7fffffff, -1, gobject.PARAM_READABLE),
'stdout' : (int, 'stdout', "child's stdout file descriptor",
-1, 0x7fffffff, -1, gobject.PARAM_READABLE),
'stderr' : (int, 'stderr', "child's stderr file descriptor",
-1, 0x7fffffff, -1, gobject.PARAM_READABLE),
}
def __init__(self, process=[], cmd='', newlines='\n', stdin=None):
gobject.GObject.__init__(self)
self.newlines = newlines
self.process = process
self.cmdname = cmd or process[0]
self.__buf = {}
if stdin is not None:
raise NotImplementedError, "Overriding stdin is not implemented"
def start(self):
from popen2 import Popen3
self.__child = Popen3(self.process, capturestderr=True)
self.__out_id = gobject.io_add_watch(self.stdout,
gobject.IO_IN|gobject.IO_ERR|gobject.IO_HUP|gobject.IO_NVAL,
self.__on_output)
self.__err_id = gobject.io_add_watch(self.stderr,
gobject.IO_IN|gobject.IO_ERR|gobject.IO_HUP|gobject.IO_NVAL,
self.__on_output)
stdin = property(lambda s: s.__child.tochild.fileno(),
doc='child stdin fd')
stdout = property(lambda s: s.__child.fromchild.fileno(),
doc='child stdout fd')
stderr = property(lambda s: s.__child.childerr.fileno(),
doc='child stderr fd')
pid = property(lambda s: s.__child.pid, doc='child pid')
def poll(self):
"""Return the exit status of the child process, or -1 if unfinished."""
return self.__child.poll()
def wait(self):
"""Wait for and return the exit status of the child process."""
return self.__child.wait()
def do_get_property(self, property):
if property.name in self.__gproperties__:
return getattr(self, property.name)
else:
raise AttributeError, 'unknown property %s' % property.name
def do_set_property(self, property, value):
if property.name in self.__gproperties__:
return setattr(self, property.name, value)
else:
raise AttributeError, 'unknown property %s' % property.name
def output_chunk(self, fd, chunk):
gobject.idle_add(self.emit, 'output-chunk', fd, chunk)
def output_line(self, fd, line):
gobject.idle_add(self.emit, 'output-line', fd, line)
def output_eof(self, fd):
gobject.idle_add(self.emit, 'output-eof', fd)
def __on_output(self, fd, cond):
if cond & gobject.IO_IN == gobject.IO_IN:
read = os.read(fd, 1024)
if read != '':
self.output_chunk(fd, read)
output = self.__buf.setdefault(fd, '') + read
lines = [output]
for splitter in self.newlines:
lines = sum([line.split(splitter) for line in lines], [])
self.__buf[fd] = lines.pop()
for line in lines:
self.output_line(fd, line)
if read == '':
self.output_line(fd, self.__buf.pop(fd))
self.output_eof(fd)
return False
return True
elif cond & (gobject.IO_ERR|gobject.IO_HUP|gobject.IO_NVAL):
self.output_eof(fd)
return False
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