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Add a @pub kwarg to allow specifying a "startup response message"

wip_fix_asyncio_gen_streaming
Tyler Goodlet 2021-01-24 11:49:00 -05:00
parent 35465a5438
commit 24c6a65873
1 changed files with 7 additions and 1 deletions

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@ -101,6 +101,7 @@ def pub(
wrapped: typing.Callable = None,
*,
tasks: Set[str] = set(),
send_on_connect: Any = None,
):
"""Publisher async generator decorator.
@ -186,7 +187,7 @@ def pub(
# handle the decorator not called with () case
if wrapped is None:
return partial(pub, tasks=tasks)
return partial(pub, tasks=tasks, send_on_connect=send_on_connect)
task2lock: Dict[str, trio.StrictFIFOLock] = {}
@ -229,6 +230,11 @@ def pub(
try:
modify_subs(topics2ctxs, topics, ctx)
# if specified send the startup message back to consumer
if send_on_connect is not None:
await ctx.send_yield(send_on_connect)
# block and let existing feed task deliver
# stream data until it is cancelled in which case
# the next waiting task will take over and spawn it again