def test_write_pid_file(self):
self.inst.start_application()
#get pid/procname of current process
this_pid = os.getpid()
this_procname = tools.process_name(this_pid)
with open(self.file_name, 'rt') as file_with_pid:
self.assertEqual(file_with_pid.read(), '{}\n{}'.format(this_pid, this_procname))
def test_auto_exit_unique_process(self):
self.inst = ApplicationInstance(os.path.abspath(self.file_name),
auto_exit = True)
self.assertTrue(os.path.exists(self.file_name))
this_pid = os.getpid()
this_procname = tools.process_name(this_pid)
with open(self.file_name, 'rt') as file_with_pid:
self.assertEqual(file_with_pid.read(), '{}\n{}'.format(this_pid, this_procname))
def test_auto_exit_other_running_process(self):
pid = self.createProcess()
procname = tools.process_name(pid)
# create file with pid and process name
with open(self.file_name, "wt") as file_with_pid:
file_with_pid.write(str(pid) + "\n")
file_with_pid.write(procname)
with self.assertRaises(SystemExit):
self.inst = ApplicationInstance(os.path.abspath(self.file_name),
auto_exit = True)
def test_existing_process_with_wrong_pid(self):
"""
Test the check function with an existing process with wrong pid
"""
pid = self.createProcess()
procname = tools.process_name(pid)
# create file with pid and process name
with open(self.file_name, "wt") as file_with_pid:
file_with_pid.write("987654321\n")
file_with_pid.write(procname)
# Execute test
self.assertTrue(self.inst.check())
def start_application( self ):
"""
Called when the single instance starts to save it's pid
"""
pid = os.getpid()
procname = tools.process_name(pid)
try:
with open( self.pid_file, 'wt' ) as f:
f.write('{}\n{}'.format(pid, procname))
except OSError as e:
logger.error('Failed to write PID file %s: [%s] %s' %(e.filename, e.errno, e.strerror))
self.flockUnlock()
def test_existing_process_with_correct_procname(self):
"""
Test the check function with an existing process with correct process
name
"""
pid = self.createProcess()
procname = tools.process_name(pid)
# create file with pid and process name
with open(self.file_name, "wt") as file_with_pid:
file_with_pid.write(str(pid) + "\n")
file_with_pid.write(procname)
# Execute test
self.assertFalse(self.inst.check())
def check(self, auto_exit=False):
"""
Check if the current application is already running
Args:
auto_exit (bool): automatically call sys.exit if there is an other
instance running
Returns:
bool: True if this is the only application instance
"""
# check if the pidfile exists
if not os.path.isfile(self.pid_file):
return True
self.pid, self.procname = self.readPidFile()
# check if the process with specified by pid exists
if 0 == self.pid:
return True
if not tools.is_process_alive(self.pid):
return True
# check if the process has the same procname
# check cmdline for backwards compatibility
if (
self.procname
and self.procname != tools.process_name(self.pid)
and self.procname != tools.process_cmdline(self.pid)
):
return True
if auto_exit:
# exit the application
print("The application is already running !")
exit(0) # exit raise an exception so don't put it in a try/except block
return False
def test_process_name(self):
pid = self.createProcess()
self.assertEqual(tools.process_name(pid), 'dummy_proc.sh')
