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(#11875)
This bug seems to be there forever, CLIENT REPLY OFF|SKIP will
mark the client with CLIENT_REPLY_OFF or CLIENT_REPLY_SKIP flags.
With these flags, prepareClientToWrite called by addReply* will
return C_ERR directly. So the client can't receive the Pub/Sub
messages and any other push notifications, e.g client side tracking.
In this PR, we adding a CLIENT_PUSHING flag, disables the reply
silencing flags. When adding push replies, set the flag, after the reply,
clear the flag. Then add the flag check in prepareClientToWrite.
Fixes #11874
Note, the SUBSCRIBE command response is a bit awkward,
see https://github.com/redis/redis-doc/pull/2327
Co-authored-by: Oran Agra <oran@redislabs.com>
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To easily distinguish between sharded channel message and a global
channel message, introducing `smessage` (instead of `message`) as
message bulk for sharded channel publish message.
This is gonna be a breaking change in 7.0.1!
Background:
Sharded pubsub introduced in redis 7.0, but after the release we quickly
realized that the fact that it's problematic that the client can't distinguish
between normal (global) pubsub messages and sharded ones.
This is important because the same connection can subscribe to both,
but messages sent to one pubsub system are not propagated to the
other (they're completely separate), so if one connection is used to
subscribe to both, we need to assist the client library to know which
message it got so it can forward it to the correct callback.
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since PUBLISH and SPUBLISH use different dictionaries for channels and clients,
and we already have an API for PUBLISH, it only makes sense to have one for SPUBLISH
Add test coverage and unifying some test infrastructure.
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This commit implements a sharded pubsub implementation based off of shard channels.
Co-authored-by: Harkrishn Patro <harkrisp@amazon.com>
Co-authored-by: Madelyn Olson <madelyneolson@gmail.com>
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