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

prehardkill
Tyler Goodlet 2021-01-24 11:49:00 -05:00
parent 5b65dd8871
commit 8ce7d4fbe2
1 changed files with 7 additions and 1 deletions
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8
tractor/msg.py
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@ -121,6 +121,7 @@ def pub(
wrapped: typing.Callable = None, wrapped: typing.Callable = None,
*, *,
tasks: Set[str] = set(), tasks: Set[str] = set(),
send_on_connect: Any = None,
): ):
"""Publisher async generator decorator. """Publisher async generator decorator.
@ -206,7 +207,7 @@ def pub(
# handle the decorator not called with () case # handle the decorator not called with () case
if wrapped is None: 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] = {} task2lock: Dict[str, trio.StrictFIFOLock] = {}
@ -249,6 +250,11 @@ def pub(
try: try:
modify_subs(topics2ctxs, topics, ctx) 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 # block and let existing feed task deliver
# stream data until it is cancelled in which case # stream data until it is cancelled in which case
# the next waiting task will take over and spawn it again # the next waiting task will take over and spawn it again