def _thread_run(self):
while True:
item = self._watchdog_queue.get()
try:
if self._reader_thread is None:
break
if item is self._QUEUE_STOP:
break
elif item is self._QUEUE_CHECK:
if self._reader_thread.alive:
continue
try:
self._reader_thread.close()
except Exception:
logger.error(
"Unable to cleanly close the Serial connection",
exc_info=True,
)
self._reader_thread, self._transport = self._new_reader_thread(
)
except Exception: # `_thread_run` should not raise
logger.error("Error in the Arduino connection watchdog thread",
exc_info=True)
finally:
self._watchdog_queue.task_done()
def exec_shell_command(shell_command: str, timeout: int = 5) -> str:
try:
p = subprocess.run(
shell_command,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
shell=True,
check=True,
timeout=timeout,
)
out = p.stdout.decode("ascii")
err = p.stderr.decode().strip()
if err:
logger.warning(
"Shell command '%s' executed successfully, but printed to stderr:\n%s",
shell_command,
err,
)
return out
except subprocess.CalledProcessError as e:
ec = e.returncode
out = e.stdout.decode().strip()
err = e.stderr.decode().strip()
logger.error(
"Shell command '%s' failed (exit code %s):\nstdout:\n%s\nstderr:\n%s\n",
shell_command,
ec,
out,
err,
)
raise
def handle_line(self, line: str) -> None:
try:
message = json.loads(line)
self._arduino_connection._incoming_message(message)
except Exception: # `handle_line` should not raise exceptions
logger.error(
"Unable to parse the status line from Arduino as json: %r",
line,
exc_info=True,
)