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refactor: organize push notification code into separate files
Split push notification implementation into focused, maintainable files for better code organization and easier navigation. Each file now has a clear responsibility and contains related functionality. File Organization: 1. push_notifications.go (Main API): - Push notification constants (MOVING, MIGRATING, etc.) - PushNotificationHandler interface - PushNotificationProcessorInterface - Public API wrappers (PushNotificationRegistry, PushNotificationProcessor) - Main entry point for push notification functionality 2. push_notification_handler_context.go (Context): - PushNotificationHandlerContext interface - pushNotificationHandlerContext concrete implementation - NewPushNotificationHandlerContext constructor - All context-related functionality with concrete type getters 3. push_notification_processor.go (Core Logic): - Registry implementation for handler management - Processor implementation for notification processing - VoidProcessor implementation for RESP2 connections - Core processing logic and notification filtering Benefits: - Clear separation of concerns between files - Easier to navigate and maintain codebase - Focused files with single responsibilities - Better code organization for large codebase - Simplified debugging and testing File Responsibilities: - Main API: Public interfaces and constants - Context: Handler context with concrete type access - Processor: Core processing logic and registry management All functionality remains intact with improved organization. Tests pass and compilation succeeds with the new file structure.
This commit is contained in:
Nedyalko Dyakov
198
push_notification_processor.go
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198
push_notification_processor.go
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package redis
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import (
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"context"
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"fmt"
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"github.com/redis/go-redis/v9/internal"
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"github.com/redis/go-redis/v9/internal/proto"
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)
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// Registry manages push notification handlers
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type Registry struct {
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handlers map[string]PushNotificationHandler
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protected map[string]bool
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}
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// NewRegistry creates a new push notification registry
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func NewRegistry() *Registry {
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return &Registry{
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handlers: make(map[string]PushNotificationHandler),
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protected: make(map[string]bool),
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}
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}
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// RegisterHandler registers a handler for a specific push notification name
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func (r *Registry) RegisterHandler(pushNotificationName string, handler PushNotificationHandler, protected bool) error {
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if handler == nil {
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return fmt.Errorf("handler cannot be nil")
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}
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// Check if handler already exists and is protected
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if existingProtected, exists := r.protected[pushNotificationName]; exists && existingProtected {
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return fmt.Errorf("cannot overwrite protected handler for push notification: %s", pushNotificationName)
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}
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r.handlers[pushNotificationName] = handler
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r.protected[pushNotificationName] = protected
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return nil
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}
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// GetHandler returns the handler for a specific push notification name
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func (r *Registry) GetHandler(pushNotificationName string) PushNotificationHandler {
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return r.handlers[pushNotificationName]
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}
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// UnregisterHandler removes a handler for a specific push notification name
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func (r *Registry) UnregisterHandler(pushNotificationName string) error {
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// Check if handler is protected
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if protected, exists := r.protected[pushNotificationName]; exists && protected {
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return fmt.Errorf("cannot unregister protected handler for push notification: %s", pushNotificationName)
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}
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delete(r.handlers, pushNotificationName)
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delete(r.protected, pushNotificationName)
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return nil
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}
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// GetRegisteredPushNotificationNames returns all registered push notification names
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func (r *Registry) GetRegisteredPushNotificationNames() []string {
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names := make([]string, 0, len(r.handlers))
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for name := range r.handlers {
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names = append(names, name)
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}
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return names
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}
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// Processor handles push notifications with a registry of handlers
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type Processor struct {
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registry *Registry
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}
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// NewProcessor creates a new push notification processor
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func NewProcessor() *Processor {
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return &Processor{
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registry: NewRegistry(),
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}
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}
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// GetHandler returns the handler for a specific push notification name
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func (p *Processor) GetHandler(pushNotificationName string) PushNotificationHandler {
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return p.registry.GetHandler(pushNotificationName)
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}
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// RegisterHandler registers a handler for a specific push notification name
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func (p *Processor) RegisterHandler(pushNotificationName string, handler PushNotificationHandler, protected bool) error {
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return p.registry.RegisterHandler(pushNotificationName, handler, protected)
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}
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// UnregisterHandler removes a handler for a specific push notification name
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func (p *Processor) UnregisterHandler(pushNotificationName string) error {
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return p.registry.UnregisterHandler(pushNotificationName)
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}
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// ProcessPendingNotifications checks for and processes any pending push notifications
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func (p *Processor) ProcessPendingNotifications(ctx context.Context, handlerCtx PushNotificationHandlerContext, rd *proto.Reader) error {
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if rd == nil {
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return nil
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}
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for {
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// Check if there's data available to read
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replyType, err := rd.PeekReplyType()
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if err != nil {
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// No more data available or error reading
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break
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}
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// Only process push notifications (arrays starting with >)
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if replyType != proto.RespPush {
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break
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}
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// Read the push notification
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reply, err := rd.ReadReply()
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if err != nil {
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internal.Logger.Printf(ctx, "push: error reading push notification: %v", err)
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break
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}
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// Convert to slice of interfaces
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notification, ok := reply.([]interface{})
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if !ok {
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continue
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}
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// Handle the notification directly
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if len(notification) > 0 {
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// Extract the notification type (first element)
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if notificationType, ok := notification[0].(string); ok {
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// Skip notifications that should be handled by other systems
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if shouldSkipNotification(notificationType) {
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continue
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}
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// Get the handler for this notification type
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if handler := p.registry.GetHandler(notificationType); handler != nil {
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// Handle the notification
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handler.HandlePushNotification(ctx, handlerCtx, notification)
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}
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}
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}
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}
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return nil
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}
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// shouldSkipNotification checks if a notification type should be ignored by the push notification
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// processor and handled by other specialized systems instead (pub/sub, streams, keyspace, etc.).
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func shouldSkipNotification(notificationType string) bool {
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switch notificationType {
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// Pub/Sub notifications - handled by pub/sub system
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case "message", // Regular pub/sub message
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"pmessage", // Pattern pub/sub message
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"subscribe", // Subscription confirmation
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"unsubscribe", // Unsubscription confirmation
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"psubscribe", // Pattern subscription confirmation
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"punsubscribe", // Pattern unsubscription confirmation
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"smessage", // Sharded pub/sub message (Redis 7.0+)
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"ssubscribe", // Sharded subscription confirmation
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"sunsubscribe": // Sharded unsubscription confirmation
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return true
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default:
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return false
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}
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}
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// VoidProcessor discards all push notifications without processing them
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type VoidProcessor struct{}
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// NewVoidProcessor creates a new void push notification processor
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func NewVoidProcessor() *VoidProcessor {
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return &VoidProcessor{}
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}
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// GetHandler returns nil for void processor since it doesn't maintain handlers
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func (v *VoidProcessor) GetHandler(pushNotificationName string) PushNotificationHandler {
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return nil
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}
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// RegisterHandler returns an error for void processor since it doesn't maintain handlers
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func (v *VoidProcessor) RegisterHandler(pushNotificationName string, handler PushNotificationHandler, protected bool) error {
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return fmt.Errorf("cannot register push notification handler '%s': push notifications are disabled (using void processor)", pushNotificationName)
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}
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// UnregisterHandler returns an error for void processor since it doesn't maintain handlers
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func (v *VoidProcessor) UnregisterHandler(pushNotificationName string) error {
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return fmt.Errorf("cannot unregister push notification handler '%s': push notifications are disabled (using void processor)", pushNotificationName)
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}
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// ProcessPendingNotifications for VoidProcessor does nothing since push notifications
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// are only available in RESP3 and this processor is used for RESP2 connections.
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// This avoids unnecessary buffer scanning overhead.
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func (v *VoidProcessor) ProcessPendingNotifications(ctx context.Context, handlerCtx PushNotificationHandlerContext, rd *proto.Reader) error {
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// VoidProcessor is used for RESP2 connections where push notifications are not available.
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// Since push notifications only exist in RESP3, we can safely skip all processing
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// to avoid unnecessary buffer scanning overhead.
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return nil
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}
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