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二手车网站策划,怎么制作动漫视频教程,宁德市教育局,怎么以公司名义注册邮箱今日已办 Watermill Handler 将 4 个阶段的逻辑处理定义为 Handler 测试发现，添加的 handler 会被覆盖掉，故考虑添加为 middleware 且 4 个阶段的处理逻辑针对不同 topic 是相同的。参考https://watermill.io/docs/messages-router/实现不同topic&am…

今日已办

Watermill

Handler

将 4 个阶段的逻辑处理定义为 Handler

测试发现，添加的 handler 会被覆盖掉，故考虑添加为 middleware 且 4 个阶段的处理逻辑针对不同 topic 是相同的。

参考https://watermill.io/docs/messages-router/实现不同topic（不同事件）走不同的Handler处理逻辑，相同处理逻辑则可以使用MiddleWare(https://watermill.io/docs/middlewares/)

Middleware

ProfileCtx实现 context.Context 接口

// Package consumer
// @Author xzx 2023/8/11 18:53:00
package consumerimport ("context""github.com/Shopify/sarama""github.com/ThreeDotsLabs/watermill""github.com/ThreeDotsLabs/watermill-kafka/v2/pkg/kafka""github.com/ThreeDotsLabs/watermill/message""github.com/ThreeDotsLabs/watermill/message/router/middleware""github.com/ThreeDotsLabs/watermill/message/router/plugin""go.uber.org/zap""profile/internal/config""profile/internal/log""profile/internal/schema""time"
)// ProfileContext
// @Description:
// @Author xzx 2023-08-11 22:21:41
type ProfileContext struct {// Properties that can be called by inherited subclassesStatus intCtx    context.ContextRouter *message.RouterEvent  schema.EventAppID         string // API 上报FetchScenario string // API 上报
}// NewProfileContext
// @Description
// @Author xzx 2023-08-11 22:49:00
// @Return *ProfileContext
func NewProfileContext() *ProfileContext {profileCtx := &ProfileContext{Ctx: context.Background(),}profileCtx.init()return profileCtx
}// init
// @Description 初始化
// @Author xzx 2023-08-11 22:22:01
func (profileCtx *ProfileContext) init() {logger := watermill.NewStdLogger(false, false)saramaSubscriberConfig := kafka.DefaultSaramaSubscriberConfig()saramaSubscriberConfig.Consumer.Offsets.Initial = sarama.OffsetOldestsubscriber, err := kafka.NewSubscriber(kafka.SubscriberConfig{Brokers:               []string{config.Profile.GetString("kafka.bootstrap")},Unmarshaler:           kafka.DefaultMarshaler{},OverwriteSaramaConfig: saramaSubscriberConfig,ConsumerGroup:         config.Profile.GetString("kafka.group"),},logger,)if err != nil {log.Logger.Error("creates a new Kafka Subscriber error", zap.Error(err))}router, err := message.NewRouter(message.RouterConfig{}, logger)if err != nil {log.Logger.Error("creates a new Router with given configuration error", zap.Error(err))}router.AddPlugin(plugin.SignalsHandler)router.AddMiddleware(middleware.CorrelationID,middleware.Retry{MaxRetries:      3,InitialInterval: time.Millisecond * 100,Logger:          logger,}.Middleware,middleware.Recoverer,)topic := "to_analyzer__0.PERF_CRASH"router.AddNoPublisherHandler("WriteKafka", topic, subscriber, profileCtx.WriteKafka).AddMiddleware(profileCtx.UnpackKafkaMessage,profileCtx.InitPerformanceEvent,profileCtx.AnalyzeEvent,)profileCtx.Router = router
}// Run
// @Description
// @Author xzx 2023-08-12 13:52:53
func (profileCtx *ProfileContext) Run() {// router.Run contains defer cancel()if err := profileCtx.Router.Run(profileCtx.Ctx); err != nil {log.Logger.Error("runs all plugins and handlers and starts subscribing to provided topics error", zap.Error(err))}
}func (profileCtx *ProfileContext) Done() <-chan struct{} {return profileCtx.Ctx.Done()
}func (profileCtx *ProfileContext) Err() error {return profileCtx.Ctx.Err()
}func (profileCtx *ProfileContext) Deadline() (deadline time.Time, ok bool) {return profileCtx.Ctx.Deadline()
}func (profileCtx *ProfileContext) Value(key any) any {return profileCtx.Ctx.Value(key)
}

【测试】前 3 个阶段处理为 Middleware，最后一个阶段为 Handler

// Package consumer
// @Author xzx 2023/8/12 10:01:00
package consumerimport ("encoding/json""github.com/ThreeDotsLabs/watermill/message""github.com/segmentio/kafka-go""go.uber.org/zap""profile/internal/connector""profile/internal/log""profile/internal/schema/performance""profile/internal/state"
)// UnpackKafkaMessage
// @Description
// @Author xzx 2023-08-12 12:27:30
// @Param h
// @Return message.HandlerFunc
func (profileCtx *ProfileContext) UnpackKafkaMessage(h message.HandlerFunc) message.HandlerFunc {return func(message *message.Message) ([]*message.Message, error) {// 反序列化，存入通用结构体if contextErr := json.Unmarshal(message.Payload, &profileCtx.Event); contextErr != nil {profileCtx.Status = state.StatusUnmarshalErrorreturn h(message)}log.Logger.Info("[UnpackKafkaItem] unpack kafka item success", zap.Any("event", profileCtx.Event))message.SetContext(profileCtx)return h(message)}
}// InitPerformanceEvent
// @Description
// @Author xzx 2023-08-12 12:27:35
// @Param h
// @Return message.HandlerFunc
func (profileCtx *ProfileContext) InitPerformanceEvent(h message.HandlerFunc) message.HandlerFunc {return func(message *message.Message) ([]*message.Message, error) {profileCtx = message.Context().(*ProfileContext)event, contextErr := performance.EventFactory(profileCtx.Event.Category, profileCtx.Event.Dimensions, profileCtx.Event.Values)if contextErr != nil {profileCtx.Status = state.StatusEventFactoryErrorreturn h(message)}log.Logger.Info("[InitPerformanceEvent] init performance event success", zap.Any("event", profileCtx.Event))profileCtx.Event.ProfileData = eventmessage.SetContext(profileCtx)return h(message)}
}// AnalyzeEvent
// @Description
// @Author xzx 2023-08-12 12:27:38
// @Param h
// @Return message.HandlerFunc
func (profileCtx *ProfileContext) AnalyzeEvent(h message.HandlerFunc) message.HandlerFunc {return func(message *message.Message) ([]*message.Message, error) {profileCtx = message.Context().(*ProfileContext)contextErr := profileCtx.Event.ProfileData.Analyze()if contextErr != nil {profileCtx.Status = state.StatusAnalyzeErrorreturn h(message)}log.Logger.Info("[AnalyzeEvent] analyze event success", zap.Any("event", profileCtx.Event))// clear dimensions and valuesprofileCtx.Event.Dimensions = nilprofileCtx.Event.Values = nilmessage.SetContext(profileCtx)return h(message)}
}// WriteKafka
// @Description
// @Author xzx 2023-08-11 22:30:47
// @Param msg
// @Return contextErr
func (profileCtx *ProfileContext) WriteKafka(msg *message.Message) (contextErr error) {profileCtx = msg.Context().(*ProfileContext)toWriteBytes, contextErr := json.Marshal(profileCtx.Event)if contextErr != nil {profileCtx.Status = state.StatusUnmarshalErrorreturn}topic := connector.GetTopic(profileCtx.Event.Category)contextErr = connector.GetProducer().WriteMessages(profileCtx.Ctx, kafka.Message{Topic: topic,Key:   []byte(profileCtx.Event.ID),Value: toWriteBytes,})if contextErr != nil {profileCtx.Status = state.StatusWriteKafkaErrorreturn}log.Logger.Info("[WriteKafka] write kafka success", zap.String("topic", topic), zap.String("id", profileCtx.Event.ID), zap.String("msg", string(toWriteBytes)))return
}

可以实现正常的效果

Router

目前的 topic 是固定写死的，要考虑正则表达式，将不同 topic 的共有逻辑抽出为 Middleware，特定逻辑抽出为 Handler
消息处理似乎不是并发的

pub/sub kafka-go

custom pub/sub
Kafka Pub/Sub for the Watermill project, based on Shopify’s Sarama
qiulin/watermill-kafkago: Kafka Pub/Sub for the Watermill project, based on segmentio/kafka-go (github.com)