How to use _spawn_logging_subprocess method in autotest

Best Python code snippet using autotest_python Github


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...391 self._point_stream_handlers_to_copy()392 def stop_logging(self):393 super(_FdRedirectionStreamManager, self).stop_logging()394 self._restore_stream_handlers()395 def _spawn_logging_subprocess(self):396 """397 Spawn a subprocess to log all input to the logging module with the398 current settings, and direct output to it.399 """400 read_end, write_end = os.pipe()401 pid = os.fork()402 if pid: # parent403 os.close(read_end)404 os.dup2(write_end, self._fd) # point FD to the subprocess405 os.close(write_end)406 return pid407 else: # child408 try:409 os.close(write_end)410 # ensure this subprocess doesn't hold any pipes to others411 os.close(1)412 os.close(2)413 self._run_logging_subprocess(read_end) # never returns414 except:415 # don't let exceptions in the child escape416 try:417 logging.exception('Logging subprocess died:')418 finally:419 os._exit(1)420 def _run_logging_subprocess(self, read_fd):421 """422 Always run from a subprocess. Read from read_fd and write to the423 logging module until EOF.424 """425 signal.signal(signal.SIGTERM, signal.SIG_DFL) # clear handler426 input_file = os.fdopen(read_fd, 'r')427 for line in iter(input_file.readline, ''):428 logging.log(self._level, line.rstrip('\n'))429 logging.debug('Logging subprocess finished')430 os._exit(0)431 def _context_id(self):432 return '%s_context' % id(self)433 def on_push_context(self, context):434 # adds a context dict for this stream, $id_context, with the following:435 # * old_fd: FD holding a copy of the managed FD before launching a new436 # subprocess.437 # * child_pid: PID of the logging subprocess launched438 fd_copy = os.dup(self._fd)439 child_pid = self._spawn_logging_subprocess()440 my_context = {'old_fd': fd_copy, 'child_pid': child_pid}441 context[self._context_id()] = my_context442 def on_restore_context(self, context):443 my_context = context[self._context_id()]444 # shut down subprocess445 child_pid = my_context['child_pid']446 try:447 os.close(self._fd)448 os.waitpid(child_pid, 0)449 except OSError:450 logging.exception('Failed to cleanly shutdown logging subprocess:')451 # restore previous FD452 old_fd = my_context['old_fd']453 os.dup2(old_fd, self._fd)...

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