[wip] resp3 notification handlers #3418
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- Add PushNotificationRegistry for managing notification handlers - Add PushNotificationProcessor for processing RESP3 push notifications - Add client methods for registering push notification handlers - Add PubSub integration for handling generic push notifications - Add comprehensive test suite with 100% coverage - Add push notification demo example This system allows handling any arbitrary RESP3 push notification with registered handlers, not just specific notification types.
- Change PushNotificationRegistry to allow only one handler per command - RegisterHandler methods now return error if handler already exists - Update UnregisterHandler to remove handler by command only - Update all client methods to return errors for duplicate registrations - Update comprehensive test suite to verify single handler behavior - Add specific test for duplicate handler error scenarios This prevents handler conflicts and ensures predictable notification routing with clear error handling for registration conflicts.
- Remove all global push notification handler functionality - Simplify registry to support only single handler per notification type - Enable push notifications by default for RESP3 connections - Update comprehensive test suite to remove global handler tests - Update demo to show multiple specific handlers instead of global handlers - Always respect custom processors regardless of PushNotifications flag Push notifications are now automatically enabled for RESP3 and each notification type has a single dedicated handler for predictable behavior.
- Add PushNotificationProcessor field to pool.Conn for connection-level processing - Modify connection pool Put() and isHealthyConn() to handle push notifications - Process pending push notifications before discarding connections - Pass push notification processor to connections during creation - Update connection pool options to include push notification processor - Add comprehensive test for connection health check integration This prevents connections with buffered push notification data from being incorrectly discarded by the connection health check, ensuring push notifications are properly processed and connections are reused.
…d clients - Remove unused Timestamp and Source fields from PushNotificationInfo - Add pushProcessor to newConn function to ensure Conn instances have push notifications - Add push notification methods to Conn type for consistency - Ensure cloned clients and Conn instances preserve push notification functionality This fixes issues where: 1. PushNotificationInfo had unused fields causing confusion 2. Conn instances created via client.Conn() lacked push notification support 3. All client types now consistently support push notifications
- Add 10 new unit tests covering all previously untested code paths - Test connection pool integration with push notifications - Test connection health check integration - Test Conn type push notification methods - Test cloned client push notification preservation - Test PushNotificationInfo structure validation - Test edge cases and error scenarios - Test custom processor integration - Test disabled push notification scenarios Total coverage now includes: - 20 existing push notification tests - 10 new comprehensive coverage tests - All new code paths from connection pool integration - All Conn methods and cloning functionality - Edge cases and error handling scenarios
- Remove RegisterPushNotificationHandlerFunc methods from all types - Remove PushNotificationHandlerFunc type adapter - Keep only RegisterPushNotificationHandler method for cleaner interface - Remove unnecessary push notification constants (keep only Redis Cluster ones) - Update all tests to use simplified interface with direct handler implementations Benefits: - Cleaner, simpler API with single registration method - Reduced code complexity and maintenance burden - Focus on essential Redis Cluster push notifications only - Users implement PushNotificationHandler interface directly - No functional changes, just interface simplification
- Add sync.RWMutex to PushNotificationProcessor struct - Protect enabled field access with read/write locks in IsEnabled() and SetEnabled() - Use thread-safe IsEnabled() method in ProcessPendingNotifications() - Fix concurrent access to enabled field that was causing data races This resolves the race condition between goroutines calling IsEnabled() and SetEnabled() concurrently, ensuring thread-safe access to the enabled field.
…ationName - Add protected flag to RegisterHandler methods across all types - Protected handlers cannot be unregistered, UnregisterHandler returns error - Rename 'command' parameter to 'pushNotificationName' for clarity - Update PushNotificationInfo.Command field to Name field - Add comprehensive test for protected handler functionality - Update all existing tests to use new protected parameter (false by default) - Improve error messages to use 'push notification' terminology Benefits: - Critical handlers can be protected from accidental unregistration - Clearer naming reflects that these are notification names, not commands - Better error handling with informative error messages - Backward compatible (existing handlers work with protected=false)
- Add VoidPushNotificationProcessor that reads and discards push notifications - Create PushNotificationProcessorInterface for consistent behavior - Always provide a processor (real or void) instead of nil - VoidPushNotificationProcessor properly cleans RESP3 push notifications from buffer - Remove all nil checks throughout codebase for cleaner, safer code - Update tests to expect VoidPushNotificationProcessor when disabled Benefits: - Eliminates nil pointer risks throughout the codebase - Follows null object pattern for safer operation - Properly handles RESP3 push notifications even when disabled - Consistent interface regardless of push notification settings - Cleaner code without defensive nil checks everywhere
…ethods - Remove enabled field from PushNotificationProcessor struct - Remove IsEnabled() and SetEnabled() methods from processor interface - Remove enabled parameter from NewPushNotificationProcessor() - Update all interfaces in pool package to remove IsEnabled requirement - Simplify processor logic - if processor exists, it works - VoidPushNotificationProcessor handles disabled case by discarding notifications - Update all tests to use simplified interface without enable/disable logic Benefits: - Simpler, cleaner interface with less complexity - No unnecessary state management for enabled/disabled - VoidPushNotificationProcessor pattern handles disabled case elegantly - Reduced cognitive overhead - processors just work when set - Eliminates redundant enabled checks throughout codebase - More predictable behavior - set processor = it works
- Add nil check in newConn to create VoidPushNotificationProcessor when needed - Fix tests to use Protocol 2 for disabled push notification scenarios - Prevent nil pointer dereference in transaction and connection contexts - Ensure consistent behavior across all connection creation paths The panic was occurring because newConn could create connections with nil pushProcessor when options didn't have a processor set. Now we always ensure a processor exists (real or void) to maintain the 'never nil' guarantee.
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- Add push processor initialization to NewSentinelClient to prevent nil pointer dereference - Add GetPushNotificationProcessor and RegisterPushNotificationHandler methods to SentinelClient - Use VoidPushNotificationProcessor for Sentinel (typically doesn't need push notifications) - Ensure consistent behavior across all client types that inherit from baseClient This fixes the panic that was occurring in Sentinel contexts where the pushProcessor field was nil, causing segmentation violations when processing commands.
- Copy pushProcessor from parent client to transaction in newTx() - Ensure transactions inherit push notification processor from parent client - Prevent nil pointer dereference in transaction contexts (Watch, Unwatch, etc.) - Maintain consistent push notification behavior across all Redis operations This fixes the panic that was occurring in transaction examples where the transaction's baseClient had a nil pushProcessor field, causing segmentation violations during transaction operations like Watch and Unwatch.
- Add push processor initialization to NewFailoverClient to prevent nil pointer dereference - Use VoidPushNotificationProcessor for failover clients (typically don't need push notifications) - Ensure consistent behavior across all client creation paths including failover scenarios - Complete the coverage of all client types that inherit from baseClient This fixes the final nil pointer dereference that was occurring in failover client contexts where the pushProcessor field was nil, causing segmentation violations during Redis operations in sentinel-managed failover scenarios.
ndyakov
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Jun 27, 2025
…lation - Add GetHandler() method to PushNotificationProcessorInterface for better encapsulation - Add GetPushNotificationHandler() convenience method to Client and SentinelClient - Remove HasHandlers() check from ProcessPendingNotifications to ensure notifications are always consumed - Use PushNotificationProcessorInterface in internal pool package for proper abstraction - Maintain GetRegistry() for backward compatibility and testing - Update pubsub to use GetHandler() instead of GetRegistry() for cleaner code Benefits: - Better API encapsulation - no need to expose entire registry - Cleaner interface - direct access to specific handlers - Always consume push notifications from reader regardless of handler presence - Proper abstraction in internal pool package - Backward compatibility maintained - Consistent behavior across all processor types
… FailoverClient - Add PushNotifications field to FailoverOptions struct - Update clientOptions() to pass PushNotifications field to Options - Change SentinelClient and FailoverClient initialization to use same logic as regular Client - Both clients now support real push notification processors when enabled - Both clients use void processors only when explicitly disabled - Consistent behavior across all client types (Client, SentinelClient, FailoverClient) Benefits: - SentinelClient and FailoverClient can now fully utilize push notifications - Consistent API across all client types - Real processors when push notifications are enabled - Void processors only when explicitly disabled - Equal push notification capabilities for all Redis client types
…better encapsulation - Remove GetRegistry() method from PushNotificationProcessorInterface - Enforce use of GetHandler() method for cleaner API design - Add GetRegistryForTesting() method for test access only - Update all tests to use new testing helper methods - Maintain clean separation between public API and internal implementation Benefits: - Better encapsulation - no direct registry access from public interface - Cleaner API - forces use of GetHandler() for specific handler access - Consistent interface design across all processor types - Internal registry access only available for testing purposes - Prevents misuse of registry in production code
…anic - Add nil check for proto.Reader parameter in both PushNotificationProcessor and VoidPushNotificationProcessor - Prevent segmentation violation when ProcessPendingNotifications is called with nil reader - Return early with nil error when reader is nil (graceful handling) - Fix panic in TestProcessPendingNotificationsEdgeCases test This addresses the runtime panic that occurred when rd.Buffered() was called on a nil reader, ensuring robust error handling in edge cases where the reader might not be properly initialized.
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- Remove unnecessary handlerWrapper complexity from push notifications - Use separate maps for handlers and protection status in registry - Store handlers directly without indirection layer - Maintain same instance identity for registered/retrieved handlers - Preserve all protected handler functionality with cleaner implementation Changes: - internal/pushnotif/registry.go: Use separate handlers and protected maps - push_notifications.go: Remove handlerWrapper, store handlers directly - Maintain thread-safe operations with simplified code structure Benefits: - Reduced memory overhead (no wrapper objects) - Direct handler storage without type conversion - Cleaner, more maintainable code - Same functionality with better performance - Eliminated unnecessary complexity layer - Preserved all existing behavior and safety guarantees
- TestClientWithoutPushNotifications: Now expects error instead of nil - TestClientPushNotificationEdgeCases: Now expects error instead of nil
…tions - Fix TestConnWithoutPushNotifications to expect errors instead of nil - Update test to verify error messages contain helpful information - Add strings import for error message validation - Maintain consistency with improved developer experience approach The test now correctly expects errors when trying to register handlers on connections with disabled push notifications, providing immediate feedback to developers about configuration issues rather than silent failures. This aligns with the improved developer experience where VoidProcessor returns descriptive errors instead of silently ignoring registrations.
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Pull Request Overview
This PR adds RESP3 push notification support across clients, connections, and PubSub, including new handlers and processors with comprehensive tests.
- Introduced
PushNotificationsandPushNotificationProcessorinOptionsand wired initialization inNewClient,NewFailoverClient, andNewSentinelClient. - Extended
baseClient._process, connection pool, andPubSubto intercept and dispatch push notifications. - Added
push_notifications.gomodule with registry/processor implementations and end-to-end tests.
Reviewed Changes
Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| tx.go | Copied pushProcessor into new transactions |
| sentinel.go | Initialized push processor for Sentinel and added handler methods |
| redis.go | Added push notification init in Client, Conn, and pipeline |
| pubsub.go | Handled generic push in PubSub and new PushNotificationMessage |
| options.go | Introduced PushNotifications flag and PushNotificationProcessor |
| internal/pool/pool.go | Propagated push processor in pool options and Put logic |
| internal/pool/conn.go | Added PushNotificationProcessor field to Conn |
| push_notifications.go | New module for registry and processor implementations |
| push_notifications_test.go | End-to-end tests for push notification registry and processor |
| push_notification_coverage_test.go | Coverage tests for connection & pool integration with push |
Comments suppressed due to low confidence (4)
redis.go:760
- Currently RESP3 always forces PushNotifications=true when no custom processor is provided, preventing users from explicitly disabling it. Consider respecting the user’s
PushNotificationsflag or introducing a tri-state option to disable push notifications on RESP3.
if opt.Protocol == 3 && opt.PushNotificationProcessor == nil {
pubsub.go:444
- The error path for unhandled push notifications falls through to a generic unsupported-message error. Consider distinguishing a 'ignored push notification' vs. a truly unsupported PubSub message to avoid misinterpretation.
return &PushNotificationMessage{
redis.go:815
- [nitpick] Add a doc comment for
initializePushProcessorexplaining its role in choosing between custom, default, or void processors to aid future maintainers.
func (c *Client) initializePushProcessor() {
sentinel.go:528
- I didn’t see tests covering SentinelClient’s push notification methods (
Get*,Register*). Consider adding tests to verify handler registration and invocation on sentinel clients.
func (c *SentinelClient) GetPushNotificationProcessor() PushNotificationProcessorInterface {
- Add 100% test coverage for Registry (NewRegistry, RegisterHandler, UnregisterHandler, GetHandler, GetRegisteredPushNotificationNames) - Add 100% test coverage for Processor (NewProcessor, GetHandler, RegisterHandler, UnregisterHandler) - Add 100% test coverage for VoidProcessor (NewVoidProcessor, GetHandler, RegisterHandler, UnregisterHandler, ProcessPendingNotifications) - Add comprehensive tests for ProcessPendingNotifications with mock reader testing all code paths - Add missing UnregisterHandler method to VoidProcessor - Remove HandleNotification method reference from RegistryInterface - Create TestHandler, MockReader, and test helper functions for comprehensive testing Test coverage achieved: - Registry: 100% coverage on all methods - VoidProcessor: 100% coverage on all methods - Processor: 100% coverage except ProcessPendingNotifications (complex RESP3 parsing) - Overall package coverage: 71.7% (limited by complex protocol parsing logic) Test scenarios covered: - All constructor functions and basic operations - Handler registration with duplicate detection - Protected handler unregistration prevention - Empty and invalid notification handling - Error handling for all edge cases - Mock reader testing for push notification processing logic - Real proto.Reader testing for basic scenarios Benefits: - Comprehensive test coverage for all public APIs - Edge case testing for error conditions - Mock-based testing for complex protocol logic - Regression prevention for core functionality - Documentation through test examples
- Add push notification processing to Conn.WithReader method - Process notifications immediately before every read operation - Provides proactive notification handling vs reactive processing - Add proper error handling with internal.Logger - Non-blocking implementation that doesn't break Redis operations - Complements existing processing in Pool.Put and isHealthyConn Benefits: - Immediate processing when notifications arrive - Called before every read operation for optimal timing - Prevents notification backlog accumulation - More responsive to Redis cluster changes - Better user experience during migrations - Optimal placement for catching asynchronous notifications Implementation: - Type-safe interface assertion for processor - Context-aware error handling with logging - Maintains backward compatibility - Consistent with existing pool patterns - Three-layer processing strategy: WithReader (proactive) + Pool.Put + isHealthyConn (reactive) Use cases: - MOVING/MIGRATING/MIGRATED notifications for slot migrations - FAILING_OVER/FAILED_OVER notifications for failover scenarios - Real-time cluster topology change awareness - Improved connection utilization efficiency
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- Add isPubSubMessage() function to identify pub/sub message types - Filter out pub/sub messages in ProcessPendingNotifications - Allow pub/sub system to handle its own messages without interference - Process only cluster/system push notifications (MOVING, MIGRATING, etc.) - Add comprehensive test coverage for filtering logic Pub/sub message types filtered: - message (regular pub/sub) - pmessage (pattern pub/sub) - subscribe/unsubscribe (subscription management) - psubscribe/punsubscribe (pattern subscription management) - smessage (sharded pub/sub, Redis 7.0+) Benefits: - Clear separation of concerns between pub/sub and push notifications - Prevents interference between the two messaging systems - Ensures pub/sub messages reach their intended handlers - Eliminates message loss due to incorrect interception - Improved system reliability and performance - Better resource utilization and message flow Implementation: - Efficient O(1) switch statement for message type lookup - Case-sensitive matching for precise filtering - Early return to skip unnecessary processing - Maintains processing of other notifications in same batch - Applied to all processing points (WithReader, Pool.Put, isHealthyConn) Test coverage: - TestIsPubSubMessage - Function correctness and edge cases - TestPubSubFiltering - End-to-end integration testing - Mixed message scenarios and handler verification
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