Add support for PubSub subscriptions with binary channel names and handlers#4068
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…ndlers (#4068) * Add support for PubSub subscriptions with binary channel names and handlers * Applying review comment + fixing spelling and linters errors * Fixing linters
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Summary
This PR adds a public
Subscription(name, handler=None)value type for PubSub subscriptions and accepts it positionally insubscribe,psubscribe, andssubscribeacross sync, async, and cluster PubSub paths.The new input form removes the kwargs-only limitation for handler-backed subscriptions.
Since Python keyword argument keys must be text strings, users previously could not attach handlers to arbitrary binary channel, pattern, or shard channel names.
Subscriptionkeeps the existing APIs intact while adding a binary-safe way to bind handlers.Reconnect replay now preserves handler-backed binary subscriptions by replaying them as positional
Subscriptionobjects instead of decoding names into kwargs.Cluster sharded PubSub forwarding and shard migration paths were updated similarly, so handler associations survive reconnects and slot movement without requiring text-decodable channel names.
Docs now show the new
Subscriptionform, mixed positional usage, and compatibility with the existing kwargs handler style.Type hints were updated for the affected subscribe methods, and
Subscriptionis re-exported from bothredisandredis.asyncio.Tests cover sync and async binary channel, pattern, and shard channel handlers, reconnect replay with handlers, and cluster shard routing/migration behavior.
Note
Medium Risk
Touches PubSub subscribe/resubscribe and cluster shard routing paths across sync+async clients; behavior changes around handler attachment and reconnect replay could affect subscription state in edge cases, though changes are well-covered by new tests.
Overview
Adds a public
Subscription(name, handler=None)value type and extendssubscribe/psubscribe/ssubscribe(sync, asyncio, cluster, and multidb) to accept handler-backed subscriptions positionally, enabling callbacks for binary channel/pattern/shard names that can’t be expressed as kwargs.Refactors PubSub argument parsing and reconnect replay to use new helper utilities (
parse_pubsub_subscriptions,pubsub_subscription_args) so handler-backed subscriptions are re-applied without decoding names into keyword keys; updates cluster shard subscription forwarding/migration to passSubscriptionobjects instead of decoded kwargs.Re-exports
Subscriptionfromredisandredis.asyncio, updates docs with mixed-form examples, and adds sync/async tests covering binary handler subscriptions, reconnect resubscribe, and cluster shard migration behavior.Reviewed by Cursor Bugbot for commit 8e129d2. Bugbot is set up for automated code reviews on this repo. Configure here.