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feat: Add async FDv2 data sources #485

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jsonbailey wants to merge 3 commits into from
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feat: Add async FDv2 data sources #485

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1d9f3df
feat: Add async FDv2 data sources
jsonbailey Aug 12, 2026
565b437
refactor: Share FDv2 polling and streaming error handling between syn…
jsonbailey Aug 13, 2026
6a237d8
fix: Close the async polling transport on stop and make FDv2 test-dat…
jsonbailey Aug 13, 2026
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2 changes: 0 additions & 2 deletions ldclient/impl/aio/concurrency.py
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Original file line number Diff line number Diff line change
Expand Up @@ -242,8 +242,6 @@ async def _run(self):
result = self.__action()
if inspect.isawaitable(result):
await result
except asyncio.CancelledError:

@jsonbailey jsonbailey Aug 13, 2026

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There is no need to catch and raise here, it isn't caught by Exception so this was just extra code.

raise
except Exception as e:
log.exception("Unexpected exception on worker task: %s" % e)
delay = next_time - time.time()
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28 changes: 12 additions & 16 deletions ldclient/impl/datasource/async_status.py
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Expand Up @@ -3,7 +3,6 @@

from ldclient.impl.dependency_tracker import DependencyTracker, KindAndKey
from ldclient.impl.listeners import Listeners
from ldclient.impl.rwlock import ReadWriteLock

@jsonbailey jsonbailey Aug 13, 2026

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The locks are not always needed in async python unless you are doing multiple awaits between the values you want to keep consistent which we are not doing here. It was over eager and trying to match sync too much.

from ldclient.interfaces import (
AsyncDataSourceUpdateSink,
AsyncFeatureStore,
Expand All @@ -23,13 +22,11 @@ def __init__(self, store: AsyncFeatureStore, status_listeners: Listeners, flag_c
self.__flag_change_listeners = flag_change_listeners
self.__tracker = DependencyTracker()

self.__lock = ReadWriteLock()
self.__status = DataSourceStatus(DataSourceState.INITIALIZING, time.time(), None)

@property
def status(self) -> DataSourceStatus:
with self.__lock.read():
return self.__status
return self.__status

async def init(self, all_data: Mapping[VersionedDataKind, Mapping[str, dict]]) -> None:
old_data: Optional[Dict[VersionedDataKind, Mapping[str, dict]]] = None
Expand Down Expand Up @@ -73,22 +70,21 @@ async def delete(self, kind: VersionedDataKind, key: str, version: int) -> None:
def update_status(self, new_state: DataSourceState, new_error: Optional[DataSourceErrorInfo]) -> None:
status_to_broadcast = None

with self.__lock.write():
old_status = self.__status
old_status = self.__status

if new_state == DataSourceState.INTERRUPTED and old_status.state == DataSourceState.INITIALIZING:
new_state = DataSourceState.INITIALIZING
if new_state == DataSourceState.INTERRUPTED and old_status.state == DataSourceState.INITIALIZING:
new_state = DataSourceState.INITIALIZING

if new_state == old_status.state and new_error is None:
return
if new_state == old_status.state and new_error is None:
return

self.__status = DataSourceStatus(
new_state,
self.__status.since if new_state == self.__status.state else time.time(),
self.__status.error if new_error is None else new_error,
)
self.__status = DataSourceStatus(
new_state,
self.__status.since if new_state == self.__status.state else time.time(),
self.__status.error if new_error is None else new_error,
)

status_to_broadcast = self.__status
status_to_broadcast = self.__status

if status_to_broadcast is not None:
self.__status_listeners.notify(status_to_broadcast)
Expand Down
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