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Improve logging of exceptions in async_create_task (#22689)

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* Improve logging of exceptions in async_create_task

* Move wrapping+logging to util.logging

* Minor refactor, fix typing

* Add test

* Remove useless @wraps, fix confusing parameter name

* Review comment
This commit is contained in:
Erik Montnemery 2019-04-29 18:53:22 +02:00 committed by Paulus Schoutsen
parent 75f53b2799
commit 84f778d23c
3 changed files with 68 additions and 10 deletions
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21
homeassistant/components/cast/media_player.py
View File

@ -24,6 +24,7 @@ from homeassistant.helpers.dispatcher import (
async_dispatcher_connect, dispatcher_send)
from homeassistant.helpers.typing import ConfigType, HomeAssistantType
import homeassistant.util.dt as dt_util
from homeassistant.util.logging import async_create_catching_coro
from . import DOMAIN as CAST_DOMAIN
@ -522,8 +523,8 @@ class CastDevice(MediaPlayerDevice):
if _is_matching_dynamic_group(self._cast_info, discover):
_LOGGER.debug("Discovered matching dynamic group: %s",
discover)
self.hass.async_create_task(
self.async_set_dynamic_group(discover))
self.hass.async_create_task(async_create_catching_coro(
self.async_set_dynamic_group(discover)))
return
if self._cast_info.uuid != discover.uuid:
@ -536,7 +537,8 @@ class CastDevice(MediaPlayerDevice):
self._cast_info.host, self._cast_info.port)
return
_LOGGER.debug("Discovered chromecast with same UUID: %s", discover)
self.hass.async_create_task(self.async_set_cast_info(discover))
self.hass.async_create_task(async_create_catching_coro(
self.async_set_cast_info(discover)))
def async_cast_removed(discover: ChromecastInfo):
"""Handle removal of Chromecast."""
@ -546,13 +548,15 @@ class CastDevice(MediaPlayerDevice):
if (self._dynamic_group_cast_info is not None and
self._dynamic_group_cast_info.uuid == discover.uuid):
_LOGGER.debug("Removed matching dynamic group: %s", discover)
self.hass.async_create_task(self.async_del_dynamic_group())
self.hass.async_create_task(async_create_catching_coro(
self.async_del_dynamic_group()))
return
if self._cast_info.uuid != discover.uuid:
# Removed is not our device.
return
_LOGGER.debug("Removed chromecast with same UUID: %s", discover)
self.hass.async_create_task(self.async_del_cast_info(discover))
self.hass.async_create_task(async_create_catching_coro(
self.async_del_cast_info(discover)))
async def async_stop(event):
"""Disconnect socket on Home Assistant stop."""
@ -565,14 +569,15 @@ class CastDevice(MediaPlayerDevice):
self.hass, SIGNAL_CAST_REMOVED,
async_cast_removed)
self.hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, async_stop)
self.hass.async_create_task(self.async_set_cast_info(self._cast_info))
self.hass.async_create_task(async_create_catching_coro(
self.async_set_cast_info(self._cast_info)))
for info in self.hass.data[KNOWN_CHROMECAST_INFO_KEY]:
if _is_matching_dynamic_group(self._cast_info, info):
_LOGGER.debug("[%s %s (%s:%s)] Found dynamic group: %s",
self.entity_id, self._cast_info.friendly_name,
self._cast_info.host, self._cast_info.port, info)
self.hass.async_create_task(
self.async_set_dynamic_group(info))
self.hass.async_create_task(async_create_catching_coro(
self.async_set_dynamic_group(info)))
break
async def async_will_remove_from_hass(self) -> None:

44
homeassistant/util/logging.py
View File

@ -6,7 +6,7 @@ import inspect
import logging
import threading
import traceback
from typing import Any, Callable, Optional
from typing import Any, Callable, Coroutine, Optional
from .async_ import run_coroutine_threadsafe
@ -130,7 +130,7 @@ def catch_log_exception(
func: Callable[..., Any],
format_err: Callable[..., Any],
*args: Any) -> Callable[[], None]:
"""Decorate an callback to catch and log exceptions."""
"""Decorate a callback to catch and log exceptions."""
def log_exception(*args: Any) -> None:
module_name = inspect.getmodule(inspect.trace()[1][0]).__name__
# Do not print the wrapper in the traceback
@ -164,3 +164,43 @@ def catch_log_exception(
log_exception(*args)
wrapper_func = wrapper
return wrapper_func
def catch_log_coro_exception(
target: Coroutine[Any, Any, Any],
format_err: Callable[..., Any],
*args: Any) -> Coroutine[Any, Any, Any]:
"""Decorate a coroutine to catch and log exceptions."""
async def coro_wrapper(*args: Any) -> Any:
"""Catch and log exception."""
try:
return await target
except Exception: # pylint: disable=broad-except
module_name = inspect.getmodule(inspect.trace()[1][0]).__name__
# Do not print the wrapper in the traceback
frames = len(inspect.trace()) - 1
exc_msg = traceback.format_exc(-frames)
friendly_msg = format_err(*args)
logging.getLogger(module_name).error('%s\n%s',
friendly_msg, exc_msg)
return None
return coro_wrapper()
def async_create_catching_coro(
target: Coroutine) -> Coroutine:
"""Wrap a coroutine to catch and log exceptions.
The exception will be logged together with a stacktrace of where the
coroutine was wrapped.
target: target coroutine.
"""
trace = traceback.extract_stack()
wrapped_target = catch_log_coro_exception(
target, lambda *args:
"Exception in {} called from\n {}".format(
target.__name__, # type: ignore
"".join(traceback.format_list(trace[:-1]))))
return wrapped_target

13
tests/util/test_logging.py
View File

@ -65,3 +65,16 @@ def test_async_handler_thread_log(loop):
assert queue.get_nowait() == log_record
assert queue.empty()
async def test_async_create_catching_coro(hass, caplog):
"""Test exception logging of wrapped coroutine."""
async def job():
raise Exception('This is a bad coroutine')
pass
hass.async_create_task(logging_util.async_create_catching_coro(job()))
await hass.async_block_till_done()
assert 'This is a bad coroutine' in caplog.text
assert ('hass.async_create_task('
'logging_util.async_create_catching_coro(job()))' in caplog.text)