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# SPDX-FileCopyrightText: © 2008-2022 Oprea Dan
# SPDX-FileCopyrightText: © 2008-2022 Bart de Koning
# SPDX-FileCopyrightText: © 2008-2022 Richard Bailey
# SPDX-FileCopyrightText: © 2008-2022 Germar Reitze
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This file is part of the program "Back In Time" which is released under GNU
# General Public License v2 (GPLv2). See LICENSES directory or go to
# <https://spdx.org/licenses/GPL-2.0-or-later.html>.
import os
import logger
from applicationinstance import ApplicationInstance
class GUIApplicationInstance(ApplicationInstance):
"""Handle one application instance mechanism.
"""
def __init__(self, baseControlFile, raiseCmd=''):
"""Specify the base for control files."""
self.raiseFile = baseControlFile + '.raise'
self.raiseCmd = raiseCmd
super(GUIApplicationInstance, self).__init__(
baseControlFile + '.pid', False, False)
# Remove raiseFile is already exists
if os.path.exists(self.raiseFile):
os.remove(self.raiseFile)
self.check()
self.startApplication()
def check(self):
"""Check if the current application is already running."""
ret = super(GUIApplicationInstance, self).check(False)
if not ret:
print(f'The application is already running. (pid: {self.pid})')
# Notify raise
try:
with open(self.raiseFile, 'wt') as f:
f.write(self.raiseCmd)
except OSError as e:
logger.error(f'Failed to write raise file {e.filename}: '
f'[{e.errno}] {e.strerror}')
# Exit raise an exception so don't put it in a try/except block
exit(0)
else:
return ret
def raiseCommand(self):
"""
check if the application must to be raised
return None if no raise needed, or a string command to raise
"""
ret_val = None
try:
if os.path.isfile(self.raiseFile):
with open(self.raiseFile, 'rt') as f:
ret_val = f.read()
os.remove(self.raiseFile)
except:
pass
return ret_val
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