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bazarr/bazarr.py

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# coding=utf-8
import os
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import platform
import signal
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import subprocess
import sys
import time
from bazarr.get_args import args
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from libs.six import PY3
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def check_python_version():
python_version = platform.python_version_tuple()
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minimum_py2_tuple = (2, 7, 13)
minimum_py3_tuple = (3, 6, 0)
minimum_py2_str = ".".join(str(i) for i in minimum_py2_tuple)
minimum_py3_str = ".".join(str(i) for i in minimum_py3_tuple)
if (int(python_version[0]) == minimum_py3_tuple[0] and int(python_version[1]) < minimum_py3_tuple[1]) or \
(int(python_version[0]) != minimum_py3_tuple[0] and int(python_version[0]) != minimum_py2_tuple[0]):
print("Python " + minimum_py3_str + " or greater required. "
"Current version is " + platform.python_version() + ". Please upgrade Python.")
sys.exit(1)
elif int(python_version[0]) == minimum_py2_tuple[0] and int(python_version[1]) < minimum_py2_tuple[1]:
print("Python " + minimum_py2_str + " or greater required. "
"Current version is " + platform.python_version() + ". Please upgrade Python.")
sys.exit(1)
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check_python_version()
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dir_name = os.path.dirname(__file__)
class ProcessRegistry:
def register(self, process):
pass
def unregister(self, process):
pass
class DaemonStatus(ProcessRegistry):
def __init__(self):
self.__should_stop = False
self.__processes = set()
def register(self, process):
self.__processes.add(process)
def unregister(self, process):
self.__processes.remove(process)
@staticmethod
def __wait_for_processes(processes, timeout):
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"""
Waits all the provided processes for the specified amount of time in seconds.
"""
reference_ts = time.time()
elapsed = 0
remaining_processes = list(processes)
while elapsed < timeout and len(remaining_processes) > 0:
remaining_time = timeout - elapsed
for ep in list(remaining_processes):
if ep.poll() is not None:
remaining_processes.remove(ep)
else:
if remaining_time > 0:
if PY3:
try:
ep.wait(remaining_time)
remaining_processes.remove(ep)
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except subprocess.TimeoutExpired:
pass
else:
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# In python 2 there is no such thing as some mechanism to wait with a timeout
time.sleep(1)
elapsed = time.time() - reference_ts
remaining_time = timeout - elapsed
return remaining_processes
@staticmethod
def __send_signal(processes, signal_no, live_processes=None):
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"""
Sends to every single of the specified processes the given signal and (if live_processes is not None) append to
it processes which are still alive.
"""
for ep in processes:
if ep.poll() is None:
if live_processes is not None:
live_processes.append(ep)
try:
ep.send_signal(signal_no)
except Exception as e:
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print('Failed sending signal %s to process %s because of an unexpected error: %s' % (
signal_no, ep.pid, e))
return live_processes
def stop(self):
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"""
Flags this instance as should stop and terminates as smoothly as possible children processes.
"""
self.__should_stop = True
live_processes = DaemonStatus.__send_signal(self.__processes, signal.SIGINT, list())
live_processes = DaemonStatus.__wait_for_processes(live_processes, 120)
DaemonStatus.__send_signal(live_processes, signal.SIGTERM)
def should_stop(self):
return self.__should_stop
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def start_bazarr(process_registry=ProcessRegistry()):
script = [sys.executable, "-u", os.path.normcase(os.path.join(dir_name, 'bazarr', 'main.py'))] + sys.argv[1:]
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print("Bazarr starting...")
ep = subprocess.Popen(script, stdout=None, stderr=None, stdin=subprocess.DEVNULL)
process_registry.register(ep)
try:
ep.wait()
process_registry.unregister(ep)
except KeyboardInterrupt:
pass
if __name__ == '__main__':
restartfile = os.path.normcase(os.path.join(args.config_dir, 'bazarr.restart'))
stopfile = os.path.normcase(os.path.join(args.config_dir, 'bazarr.stop'))
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try:
os.remove(restartfile)
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except Exception:
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pass
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try:
os.remove(stopfile)
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except Exception:
pass
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def daemon(bazarr_runner=lambda: start_bazarr()):
if os.path.exists(stopfile):
try:
os.remove(stopfile)
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except Exception:
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print('Unable to delete stop file.')
else:
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print('Bazarr exited.')
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sys.exit(0)
if os.path.exists(restartfile):
try:
os.remove(restartfile)
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except Exception:
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print('Unable to delete restart file.')
else:
bazarr_runner()
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bazarr_runner = lambda: start_bazarr()
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should_stop = lambda: False
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if PY3:
daemonStatus = DaemonStatus()
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def shutdown():
# indicates that everything should stop
daemonStatus.stop()
# emulate a Ctrl C command on itself (bypasses the signal thing but, then, emulates the "Ctrl+C break")
os.kill(os.getpid(), signal.SIGINT)
signal.signal(signal.SIGTERM, lambda signal_no, frame: shutdown())
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should_stop = lambda: daemonStatus.should_stop()
bazarr_runner = lambda: start_bazarr(daemonStatus)
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bazarr_runner()
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# Keep the script running forever until stop is requested through term or keyboard interrupt
while not should_stop():
daemon(bazarr_runner)
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time.sleep(1)