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bluez: Allow accessing Bleak from multiple individual event loops (not simultaneously) #1031

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bluez: Allow accessing Bleak from multiple individual event loops (not simultaneously) #1031

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25 changes: 22 additions & 3 deletions bleak/backends/bluezdbus/manager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
Optional,
Set,
cast,
Union,
)

from dbus_fast import BusType, Message, MessageType, Variant
Expand Down Expand Up @@ -846,12 +847,30 @@ def _run_advertisement_callbacks(
async def get_global_bluez_manager() -> BlueZManager:
"""
Gets the initialized global BlueZ manager instance.

If a BlueZ manager was previously initialized and associated with an event loop which is now closed,
then a new instance will be created to replace it.
"""

if not hasattr(get_global_bluez_manager, "instance"):
setattr(get_global_bluez_manager, "instance", BlueZManager())
loop = asyncio.get_event_loop()

instance: BlueZManager = getattr(get_global_bluez_manager, "instance")
if not hasattr(get_global_bluez_manager, "instance"):
get_global_bluez_manager.instance = BlueZManager()
get_global_bluez_manager.loop = loop

instance: BlueZManager = get_global_bluez_manager.instance
stored_loop: Union(
asyncio.SelectorEventLoop, asyncio.ProactorEventLoop
) = get_global_bluez_manager.loop

if loop != stored_loop:
if stored_loop.is_closed():
logger.debug("Replacing BlueZManager for new event loop")
instance = BlueZManager()
get_global_bluez_manager.instance = instance
get_global_bluez_manager.loop = loop
else:
logger.warning("Accessing BlueZ from two open event loops is not supported")

await instance.async_init()

Expand Down