fix: 拆分 RabbitMQ Channel，修复新视频不出现在推荐列表的问题

- RabbitMQ 结构体移除共享 Ch 字段，仅管理 Connection
- 每个MQ组件(Like/Comment/Social/Popularity/Timeline)持有独立 Channel
- Timeline Consumer 使用独立 Channel 并加入自动重连机制
- Redis 操作超时从 50ms 调整为 500ms，避免 NACK 循环
- router.go 中 notification 相关逻辑适配新 API

backend/internal/middleware/rabbitmq/commentMQ.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type CommentMQ struct {
-	*RabbitMQ
+	ch *amqp.Channel
 }
 
 const (
@@ -34,10 +36,15 @@ func NewCommentMQ(base *RabbitMQ) (*CommentMQ, error) {
 	if base == nil {
 		return nil, errors.New("rabbitmq base is nil")
 	}
-	if err := base.DeclareTopic(commentExchange, commentQueue, commentBindingKey); err != nil {
+	ch, err := base.NewChannel()
+	if err != nil {
 		return nil, err
 	}
-	return &CommentMQ{RabbitMQ: base}, nil
+	if err := DeclareTopic(ch, commentExchange, commentQueue, commentBindingKey); err != nil {
+		ch.Close()
+		return nil, err
+	}
+	return &CommentMQ{ch: ch}, nil
 }
 
 func (c *CommentMQ) Publish(ctx context.Context, username string, videoID, authorID uint, content string) error {
@@ -56,7 +63,7 @@ func (c *CommentMQ) Delete(ctx context.Context, commentID uint) error {
 }
 
 func (c *CommentMQ) publish(ctx context.Context, action, routingKey string, evt CommentEvent) error {
-	if c == nil || c.RabbitMQ == nil {
+	if c == nil || c.ch == nil {
 		return errors.New("comment mq is not initialized")
 	}
 	id, err := newEventID(16)
@@ -66,5 +73,5 @@ func (c *CommentMQ) publish(ctx context.Context, action, routingKey string, evt
 	evt.EventID = id
 	evt.Action = action
 	evt.OccurredAt = time.Now().UTC()
-	return c.PublishJSON(ctx, commentExchange, routingKey, evt)
+	return PublishJSON(ctx, c.ch, commentExchange, routingKey, evt)
 }

backend/internal/middleware/rabbitmq/likeMQ.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type LikeMQ struct {
-	*RabbitMQ
+	ch *amqp.Channel
 }
 
 const (
@@ -31,10 +33,15 @@ func NewLikeMQ(base *RabbitMQ) (*LikeMQ, error) {
 	if base == nil {
 		return nil, errors.New("rabbitmq base is nil")
 	}
-	if err := base.DeclareTopic(likeExchange, likeQueue, likeBindingKey); err != nil {
+	ch, err := base.NewChannel()
+	if err != nil {
 		return nil, err
 	}
-	return &LikeMQ{RabbitMQ: base}, nil
+	if err := DeclareTopic(ch, likeExchange, likeQueue, likeBindingKey); err != nil {
+		ch.Close()
+		return nil, err
+	}
+	return &LikeMQ{ch: ch}, nil
 }
 
 func (l *LikeMQ) Like(ctx context.Context, userID, videoID uint) error {
@@ -46,7 +53,7 @@ func (l *LikeMQ) Unlike(ctx context.Context, userID, videoID uint) error {
 }
 
 func (l *LikeMQ) publish(ctx context.Context, action, routingKey string, userID, videoID uint) error {
-	if l == nil || l.RabbitMQ == nil {
+	if l == nil || l.ch == nil {
 		return errors.New("like mq is not initialized")
 	}
 	if userID == 0 || videoID == 0 {
@@ -63,5 +70,5 @@ func (l *LikeMQ) publish(ctx context.Context, action, routingKey string, userID,
 		VideoID:    videoID,
 		OccurredAt: time.Now(),
 	}
-	return l.PublishJSON(ctx, likeExchange, routingKey, event)
+	return PublishJSON(ctx, l.ch, likeExchange, routingKey, event)
 }

backend/internal/middleware/rabbitmq/popularityMQ.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type PopularityMQ struct {
-	*RabbitMQ
+	ch *amqp.Channel
 }
 
 const (
@@ -29,14 +31,19 @@ func NewPopularityMQ(base *RabbitMQ) (*PopularityMQ, error) {
 	if base == nil {
 		return nil, errors.New("rabbitmq base is nil")
 	}
-	if err := base.DeclareTopic(popularityExchange, popularityQueue, popularityBindingKey); err != nil {
+	ch, err := base.NewChannel()
+	if err != nil {
 		return nil, err
 	}
-	return &PopularityMQ{RabbitMQ: base}, nil
+	if err := DeclareTopic(ch, popularityExchange, popularityQueue, popularityBindingKey); err != nil {
+		ch.Close()
+		return nil, err
+	}
+	return &PopularityMQ{ch: ch}, nil
 }
 
 func (p *PopularityMQ) Update(ctx context.Context, videoID uint, change int64) error {
-	if p == nil || p.RabbitMQ == nil {
+	if p == nil || p.ch == nil {
 		return errors.New("popularity mq is not initialized")
 	}
 	if videoID == 0 || change == 0 {
@@ -52,5 +59,5 @@ func (p *PopularityMQ) Update(ctx context.Context, videoID uint, change int64) e
 		Change:     change,
 		OccurredAt: time.Now().UTC(),
 	}
-	return p.PublishJSON(ctx, popularityExchange, popularityUpdateRK, event)
+	return PublishJSON(ctx, p.ch, popularityExchange, popularityUpdateRK, event)
 }

backend/internal/middleware/rabbitmq/rabbitMQ.go

@@ -14,9 +14,9 @@ import (
 	amqp "github.com/rabbitmq/amqp091-go"
 )
 
+// RabbitMQ 只管理 Connection，Channel 由各组件按需创建
 type RabbitMQ struct {
 	Conn *amqp.Connection
-	Ch   *amqp.Channel
 }
 
 func NewRabbitMQ(cfg *config.RabbitMQConfig) (*RabbitMQ, error) {
@@ -28,41 +28,35 @@ func NewRabbitMQ(cfg *config.RabbitMQConfig) (*RabbitMQ, error) {
 	if err != nil {
 		return nil, err
 	}
-	ch, err := conn.Channel()
-	if err != nil {
-		_ = conn.Close()
-		return nil, err
-	}
-	return &RabbitMQ{Conn: conn, Ch: ch}, nil
+	return &RabbitMQ{Conn: conn}, nil
 }
 
 func (r *RabbitMQ) Close() error {
 	if r == nil {
 		return nil
 	}
-	var closeErr error
-	if r.Ch != nil {
-		if err := r.Ch.Close(); err != nil {
-			closeErr = err
-		}
-	}
 	if r.Conn != nil {
-		if err := r.Conn.Close(); closeErr == nil && err != nil {
-			closeErr = err
-		}
+		return r.Conn.Close()
 	}
-	return closeErr
+	return nil
 }
 
-func (r *RabbitMQ) DeclareTopic(exchange string, queue string, bindingKey string) error {
-	if r == nil || r.Ch == nil {
-		return errors.New("rabbitmq is not initialized")
+func (r *RabbitMQ) NewChannel() (*amqp.Channel, error) {
+	if r == nil || r.Conn == nil {
+		return nil, errors.New("rabbitmq connection is not initialized")
+	}
+	return r.Conn.Channel()
+}
+
+func DeclareTopic(ch *amqp.Channel, exchange string, queue string, bindingKey string) error {
+	if ch == nil {
+		return errors.New("channel is not initialized")
 	}
 	if exchange == "" || queue == "" || bindingKey == "" {
 		return errors.New("exchange/queue/bindingKey is required")
 	}
 
-	if err := r.Ch.ExchangeDeclare(
+	if err := ch.ExchangeDeclare(
 		exchange,
 		"topic",
 		true,
@@ -74,7 +68,7 @@ func (r *RabbitMQ) DeclareTopic(exchange string, queue string, bindingKey string
 		return err
 	}
 
-	q, err := r.Ch.QueueDeclare(
+	q, err := ch.QueueDeclare(
 		queue,
 		true,
 		false,
@@ -86,7 +80,7 @@ func (r *RabbitMQ) DeclareTopic(exchange string, queue string, bindingKey string
 		return err
 	}
 
-	if err := r.Ch.QueueBind(
+	if err := ch.QueueBind(
 		q.Name,
 		bindingKey,
 		exchange,
@@ -95,15 +89,15 @@ func (r *RabbitMQ) DeclareTopic(exchange string, queue string, bindingKey string
 	); err != nil {
 		return err
 	}
-	if err := DeclareDLX(r.Ch, queue); err != nil {
+	if err := DeclareDLX(ch, queue); err != nil {
 		log.Printf("DLX declare failed for %s: %v", queue, err)
 	}
 	return nil
 }
 
-func (r *RabbitMQ) PublishJSON(ctx context.Context, exchange string, routingKey string, payload any) error {
-	if r == nil || r.Ch == nil {
-		return errors.New("rabbitmq is not initialized")
+func PublishJSON(ctx context.Context, ch *amqp.Channel, exchange string, routingKey string, payload any) error {
+	if ch == nil {
+		return errors.New("channel is not initialized")
 	}
 	if exchange == "" || routingKey == "" {
 		return errors.New("exchange and routingKey are required")
@@ -112,7 +106,7 @@ func (r *RabbitMQ) PublishJSON(ctx context.Context, exchange string, routingKey
 	if err != nil {
 		return err
 	}
-	return r.Ch.PublishWithContext(ctx, exchange, routingKey, false, false, amqp.Publishing{
+	return ch.PublishWithContext(ctx, exchange, routingKey, false, false, amqp.Publishing{
 		ContentType:  "application/json",
 		DeliveryMode: amqp.Persistent,
 		Timestamp:    time.Now(),

backend/internal/middleware/rabbitmq/socialMQ.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type SocialMQ struct {
-	*RabbitMQ
+	ch *amqp.Channel
 }
 
 const (
@@ -31,10 +33,15 @@ func NewSocialMQ(base *RabbitMQ) (*SocialMQ, error) {
 	if base == nil {
 		return nil, errors.New("rabbitmq base is nil")
 	}
-	if err := base.DeclareTopic(socialExchange, socialQueue, socialBindingKey); err != nil {
+	ch, err := base.NewChannel()
+	if err != nil {
 		return nil, err
 	}
-	return &SocialMQ{RabbitMQ: base}, nil
+	if err := DeclareTopic(ch, socialExchange, socialQueue, socialBindingKey); err != nil {
+		ch.Close()
+		return nil, err
+	}
+	return &SocialMQ{ch: ch}, nil
 }
 
 func (s *SocialMQ) Follow(ctx context.Context, followerID, vloggerID uint) error {
@@ -46,7 +53,7 @@ func (s *SocialMQ) UnFollow(ctx context.Context, followerID, vloggerID uint) err
 }
 
 func (s *SocialMQ) publish(ctx context.Context, action, routingKey string, followerID, vloggerID uint) error {
-	if s == nil || s.RabbitMQ == nil {
+	if s == nil || s.ch == nil {
 		return errors.New("social mq is not initialized")
 	}
 	if followerID == 0 || vloggerID == 0 {
@@ -63,5 +70,5 @@ func (s *SocialMQ) publish(ctx context.Context, action, routingKey string, follo
 		VloggerID:  vloggerID,
 		OccurredAt: time.Now().UTC(),
 	}
-	return s.PublishJSON(ctx, socialExchange, routingKey, evt)
+	return PublishJSON(ctx, s.ch, socialExchange, routingKey, evt)
 }

backend/internal/middleware/rabbitmq/timelineMQ.go

@@ -4,10 +4,12 @@ import (
 	"context"
 	"errors"
 	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type TimelineMQ struct {
-	*RabbitMQ
+	ch *amqp.Channel
 }
 
 const (
@@ -28,14 +30,19 @@ func NewTimelineMQ(base *RabbitMQ) (*TimelineMQ, error) {
 	if base == nil {
 		return nil, errors.New("rabbitmq base is nil")
 	}
-	if err := base.DeclareTopic(timelineExchange, timelineQueue, timelineBindingKey); err != nil {
+	ch, err := base.NewChannel()
+	if err != nil {
 		return nil, err
 	}
-	return &TimelineMQ{RabbitMQ: base}, nil
+	if err := DeclareTopic(ch, timelineExchange, timelineQueue, timelineBindingKey); err != nil {
+		ch.Close()
+		return nil, err
+	}
+	return &TimelineMQ{ch: ch}, nil
 }
 
 func (t *TimelineMQ) PublishVideo(ctx context.Context, videoID uint, createTime time.Time) error {
-	if t == nil || t.RabbitMQ == nil {
+	if t == nil || t.ch == nil {
 		return errors.New("timeline mq is not initialized")
 	}
 	if videoID == 0 {
@@ -51,5 +58,5 @@ func (t *TimelineMQ) PublishVideo(ctx context.Context, videoID uint, createTime
 		CreateTime: createTime.UnixMilli(),
 		OccurredAt: time.Now(),
 	}
-	return t.PublishJSON(ctx, timelineExchange, timelinePublishRK, timeline)
+	return PublishJSON(ctx, t.ch, timelineExchange, timelinePublishRK, timeline)
 }