Viewing file:  nonblockingreader.py (1.93 KB) -rwxr-xr-x
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
#!/usr/bin/python
# nonblockingreader.py -- read from file objects without blocking UIs
#
# Copyright (C) 2004 Red Hat, Inc.
# Copyright (C) 2004 Nils Philippsen <nphilipp@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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 time
import select
class Reader:
def run (self, fileobjs, callback=None, serviceinterval=0.1, readmax=128):
outputs = {}
for fileobj in fileobjs:
outputs[fileobj] = ""
while len (fileobjs):
if callback:
callback ()
available = select.select (fileobjs, [], [], serviceinterval)
for fileobj in available[0]:
text = fileobj.read (readmax)
if len (text) != 0:
outputs[fileobj] += text
else:
#EOF
fileobjs.remove (fileobj)
return outputs
if __name__ == "__main__":
import sys
import string
import os
if len (sys.argv) <= 1:
print "Usage: nonblockingreader.py command [options...]"
sys.exit (1)
cmd = string.join (sys.argv[1:])
def callback ():
print "callback called"
stdin, stdout, stderr = os.popen3 (cmd)
stdin.close ()
print Reader ().run ([stdout, stderr], callback, 0.1)
stdout.close ()
stderr.close ()
|