Add a @pub kwarg to allow specifying a "startup response message"
parent
5b65dd8871
commit
8ce7d4fbe2
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@ -121,6 +121,7 @@ def pub(
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wrapped: typing.Callable = None,
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wrapped: typing.Callable = None,
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*,
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*,
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tasks: Set[str] = set(),
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tasks: Set[str] = set(),
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send_on_connect: Any = None,
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):
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):
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"""Publisher async generator decorator.
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"""Publisher async generator decorator.
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@ -206,7 +207,7 @@ def pub(
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# handle the decorator not called with () case
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# handle the decorator not called with () case
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if wrapped is None:
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if wrapped is None:
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return partial(pub, tasks=tasks)
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return partial(pub, tasks=tasks, send_on_connect=send_on_connect)
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task2lock: Dict[str, trio.StrictFIFOLock] = {}
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task2lock: Dict[str, trio.StrictFIFOLock] = {}
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@ -249,6 +250,11 @@ def pub(
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try:
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try:
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modify_subs(topics2ctxs, topics, ctx)
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modify_subs(topics2ctxs, topics, ctx)
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# if specified send the startup message back to consumer
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if send_on_connect is not None:
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await ctx.send_yield(send_on_connect)
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# block and let existing feed task deliver
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# block and let existing feed task deliver
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# stream data until it is cancelled in which case
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# stream data until it is cancelled in which case
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# the next waiting task will take over and spawn it again
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# the next waiting task will take over and spawn it again
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