def _disposable_and_async_gen_from_obs(obs: Observable, loop):
"""
Compatability layer for legacy Observable to async generator
This should be removed and subscription resolvers changed to
return async generators after removal of flask & gevent based dagit.
"""
queue: Queue = Queue()
# process observable in a thread, handle results in aio loop
disposable = obs.subscribe_on(thread_pool_scheduler).subscribe(
on_next=lambda i: loop.call_soon_threadsafe(queue.put_nowait, i))
async def async_gen():
while True:
i = await queue.get()
yield i
return disposable, async_gen()
