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Fix Windows loop #16737

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Merged
balloob merged 3 commits into from
Sep 22, 2018
Merged

Fix Windows loop #16737

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cdaa715
Fix Windows loop
balloob Sep 20, 2018
b2604b6
Fix windows Ctrl+C
awarecan Sep 21, 2018
6ecd00c
Move windows restart handler out of setup_and_run_hass
awarecan Sep 21, 2018
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18 changes: 11 additions & 7 deletions homeassistant/__main__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,15 +19,19 @@
)


def attempt_use_uvloop() -> None:
def set_loop() -> None:
"""Attempt to use uvloop."""
import asyncio
try:
import uvloop
except ImportError:
pass

if sys.platform == 'win32':
asyncio.set_event_loop(asyncio.ProactorEventLoop())
else:
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
try:
import uvloop
except ImportError:
pass
else:
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

@pvizeli pvizeli Sep 20, 2018 •
edited
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Could be simple:

try:
   import uvloop
   asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
except ..:
   pass

@smurfix smurfix Sep 21, 2018

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Yes it's simpler, but the part that's supposed to raise an ImportError is the actual import. I don't want to guard the policy call because if uvloop has an internal problem which happens to raise an ImportError the system may be left in an inconsistent state and the error won't be reported.

All of this is probably not relevant in this particular case, but I got into the habit of following this pattern as a matter of principle because it's good coding practice and I did hit that set of circumstances often enough to be wary of it.



def validate_python() -> None:
Expand Down Expand Up @@ -345,7 +349,7 @@ def main() -> int:
monkey_patch.disable_c_asyncio()
monkey_patch.patch_weakref_tasks()

attempt_use_uvloop()
set_loop()

args = get_arguments()

Expand Down
5 changes: 1 addition & 4 deletions homeassistant/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -129,10 +129,7 @@ def __init__(
self,
loop: Optional[asyncio.events.AbstractEventLoop] = None) -> None:
"""Initialize new Home Assistant object."""
if sys.platform == 'win32':
self.loop = loop or asyncio.ProactorEventLoop()
else:
self.loop = loop or asyncio.get_event_loop()
self.loop = loop or asyncio.get_event_loop()

executor_opts = {'max_workers': None} # type: Dict[str, Any]
if sys.version_info[:2] >= (3, 6):
Expand Down