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Code Issues Releases Wiki Activity

Detect errors in the subprocess of CommandEventHandler

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This commit is contained in:
Kristóf Tóth 2019-05-12 22:30:49 +02:00
parent 78d70f2f8b
commit ca5be9d848
1 changed files with 27 additions and 6 deletions
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33
lib/tfw/components/pipe_io_event_handler.py
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@ -6,11 +6,14 @@ from os import getpgid, killpg
from os.path import join
from signal import SIGTERM
from secrets import token_urlsafe
from time import sleep
from threading import Thread
from contextlib import suppress
from tfw import EventHandlerBase
from tfw.config.logs import logging
from .pipe_io_server import PipeIOServer
from .pipe_io_server import PipeIOServer, terminate_process_on_failure
LOG = logging.getLogger(__name__)
DEFAULT_PERMISSIONS = 0o600
@ -107,18 +110,36 @@ class CommandEventHandler(PipeIOEventHandler):
self._proc_stdout = open(self.pipe_io.in_pipe, 'wb')
self._proc = Popen(
command, shell=True, executable='/bin/bash',
stdin=self._proc_stdin, stdout=self._proc_stdout,
stdin=self._proc_stdin, stdout=self._proc_stdout, stderr=PIPE,
start_new_session=True
)
self._poll_check_proc_thread = self._start_poll_check_proc()
def _generate_tempfilename(self):
# pylint: disable=no-self-use
random_filename = partial(token_urlsafe, 10)
return join('/tmp', f'{type(self).__name__}.{random_filename()}')
def _start_poll_check_proc(self):
thread = Thread(target=self._poll_check_proc, daemon=True)
thread.start()
return thread
@terminate_process_on_failure
def _poll_check_proc(self):
while True:
self.check_proc()
sleep(1)
def check_proc(self):
if self._proc.poll() is not None:
_, stderr = self._proc.communicate()
raise RuntimeError(f'Subprocess failed: {stderr.decode()}')
def cleanup(self):
process_group_id = getpgid(self._proc.pid)
killpg(process_group_id, SIGTERM)
self._proc_stdin.close()
self._proc_stdout.close()
with suppress(ProcessLookupError):
process_group_id = getpgid(self._proc.pid)
killpg(process_group_id, SIGTERM)
self._proc_stdin.close()
self._proc_stdout.close()
super().cleanup()