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# -*- coding: utf-8 -*-
#
# gtklick
#
# Copyright (C) 2008-2010 Dominic Sacré <dominic.sacre@gmx.de>
#
# 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.
import liblo
import subprocess
import sys
import threading
KLICK_PATH = 'klick'
MIN_KLICK_VERSION = (0,11,0)
START_TIMEOUT = 10
class KlickBackendError:
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class make_method(liblo.make_method):
def __init__(self, path, types):
liblo.make_method.__init__(self, '/klick' + path, types)
class KlickBackend(liblo.ServerThread):
def __init__(self, name, port, return_port, connect, verbose):
self.addr = None
self.version = None
self.ready = threading.Event()
self.check_version()
# call base class c'tor and start OSC server
liblo.ServerThread.__init__(self, return_port)
self.start()
if not connect:
# start klick process
try:
args = [ KLICK_PATH, '-n', name, '-R', self.get_url() ]
if port:
args += ['-o', str(port)]
if verbose:
args += ['-L']
self.process = subprocess.Popen(args)
except OSError, e:
raise KlickBackendError(_("failed to start klick: %s") % e.strerror)
# wait for klick to send /klick/ready
if not self.wait():
raise KlickBackendError(_("timeout while waiting for klick to start"))
else:
self.process = None
# check if klick is running
liblo.ServerThread.send(self, port, '/klick/check')
if not self.wait():
raise KlickBackendError(_("can't connect to klick"))
# register as client
self.send('/register_client')
def __del__(self):
self.quit()
def quit(self):
if self.addr:
self.send('/unregister_client')
if self.process:
self.send('/quit')
def check_version(self):
try:
output = subprocess.Popen([KLICK_PATH, '-V'], stdout=subprocess.PIPE).communicate()[0]
except OSError, e:
raise KlickBackendError(_("failed to start klick: %s\nplease make sure klick is installed.") % e.strerror)
try:
version_string = output.split()[1]
self.version = tuple(int(x) for x in version_string.split('.'))
if self.version < MIN_KLICK_VERSION:
raise KlickBackendError(_("your version of klick is too old (%s).\nplease upgrade to klick %d.%d.%d or later.") %
((version_string,) + MIN_KLICK_VERSION))
except ValueError:
# let's hope for the best
print "couldn't parse klick version"
def get_version(self):
return self.version
def check_process(self):
return self.process and self.process.poll() == None
def wait(self):
for n in range(START_TIMEOUT):
self.ready.wait(1)
if self.addr:
if n > 0:
sys.stdout.write("\n")
return True
sys.stdout.write(".")
sys.stdout.flush()
sys.stdout.write("\n")
return False
def send(self, path, *args):
liblo.ServerThread.send(self, self.addr, '/klick' + path, *args)
@make_method('/ready', '')
def ready_cb(self, path, args, types, src):
self.addr = src
self.ready.set()
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