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feat(api): send ping while the connection is idle

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To keep the connection alive and avoid being closed.
This commit is contained in:
QuantumGhost
2026-01-14 10:25:13 +08:00
parent 9c287ee0ae
commit 8e0e5d2974
2 changed files with 10 additions and 3 deletions
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11
api/core/app/apps/message_generator.py
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@ -31,18 +31,21 @@ class MessageGenerator:
app_mode: AppMode,
workflow_run_id: str,
idle_timeout=300,
ping_interval: float = 10.0,
on_subscribe: Callable[[], None] | None = None,
) -> Generator[Mapping | str, None, None]:
topic = cls.get_response_topic(app_mode, workflow_run_id)
return _topic_msg_generator(topic, idle_timeout, on_subscribe)
return _topic_msg_generator(topic, idle_timeout, ping_interval, on_subscribe)
def _topic_msg_generator(
topic: Topic,
idle_timeout: float,
ping_interval: float,
on_subscribe: Callable[[], None] | None = None,
) -> Generator[Mapping[str, Any], None, None]:
last_msg_time = time.time()
last_ping_time = last_msg_time
with topic.subscribe() as sub:
# on_subscribe fires only after the Redis subscription is active.
# This is used to gate task start and reduce pub/sub race for the first event.
@ -50,17 +53,21 @@ def _topic_msg_generator(
on_subscribe()
while True:
try:
msg = sub.receive()
msg = sub.receive(timeout=0.1)
except SubscriptionClosedError:
return
if msg is None:
current_time = time.time()
if current_time - last_msg_time > idle_timeout:
return
if current_time - last_ping_time >= ping_interval:
yield "ping"
last_ping_time = current_time
# skip the `None` message
continue
last_msg_time = time.time()
last_ping_time = last_msg_time
event = json.loads(msg)
yield event
if not isinstance(event, dict):