How to use ConsumeClaim method of kafka Package

Best Venom code snippet using kafka.ConsumeClaim

kafka_client.go

Source: kafka_client.go Github

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...138 w *KafkaClient139 taskCallback func(t *Task) *TaskResult140 compensateCallback func(t *Task) *TaskResult141}142/​/​ Setup is run at the beginning of a new session, before ConsumeClaim143func (wh *workerHandler) Setup(sarama.ConsumerGroupSession) error { return nil }144/​/​ Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited145func (wh *workerHandler) Cleanup(sarama.ConsumerGroupSession) error { return nil }146/​/​ ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages().147func (wh *workerHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {148 var wg sync.WaitGroup149 for m := range claim.Messages() {150 wg.Add(1)151 go func(m *sarama.ConsumerMessage) {152 defer wg.Done()153 currentMillis := time.Now().UnixNano() /​ int64(time.Millisecond)154 t := Task{}155 if err := json.Unmarshal(m.Value, &t); err != nil {156 fmt.Println("Bad payload", err, m.Topic, m.Partition, m.Offset)157 return158 }159 elapsedTime := int(currentMillis - t.StartTime)160 if t.AckTimeout > 0 && t.AckTimeout < elapsedTime || t.Timeout > 0 && t.Timeout < elapsedTime {161 fmt.Printf(`Already timeout: %s`, t.TaskID)162 return163 }164 tr := NewTaskResult(&t)165 tr.Status = TaskStatusInProgress166 wh.w.UpdateTask(tr)167 defer func() {168 if err := recover(); err != nil {169 tr.Status = TaskStatusFailed170 tr.Output = fmt.Sprintf("callback error: %v", err)171 wh.w.UpdateTask(tr)172 }173 }()174 switch t.Type {175 case TaskTypeTask:176 tr = wh.taskCallback(&t)177 wh.w.UpdateTask(tr)178 case TaskTypeCompensate:179 tr = wh.compensateCallback(&t)180 wh.w.UpdateTask(tr)181 default:182 tr.Status = TaskStatusFailed183 tr.Output = "Unknown task type"184 wh.w.UpdateTask(tr)185 }186 session.MarkMessage(m, "")187 }(m)188 }189 wg.Wait() /​/​ Wait for every task ran before pull for new batch190 return nil191}192/​/​ eventWatcherHandler193type eventWatcherHandler struct {194 w *KafkaClient195 ch chan interface{}196}197/​/​ Setup is run at the beginning of a new session, before ConsumeClaim198func (eh *eventWatcherHandler) Setup(sarama.ConsumerGroupSession) error { return nil }199/​/​ Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited200func (eh *eventWatcherHandler) Cleanup(sarama.ConsumerGroupSession) error { return nil }201/​/​ ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages().202func (eh *eventWatcherHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {203 for m := range claim.Messages() {204 go func(m *sarama.ConsumerMessage) {205 session.MarkMessage(m, "")206 var be BaseEvent207 err := json.Unmarshal(m.Value, &be)208 if err != nil {209 log.Println(err)210 return211 }212 if be.IsError == true {213 switch be.Type {214 case EventTypeTransaction:215 var e EventTransactionError216 err := json.Unmarshal(m.Value, &e)...

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sarama.go

Source: sarama.go Github

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...106/​/​ <-p.ready107/​/​ glog.Warningf("kafka consumer up and running...")108/​/​ return close109/​/​ }110/​/​ /​/​ Setup is run at the beginning of a new session, before ConsumeClaim111/​/​ func (p *Consumer) Setup(sarama.ConsumerGroupSession) error {112/​/​ /​/​ Mark the consumer as ready113/​/​ close(p.ready)114/​/​ return nil115/​/​ }116/​/​ /​/​ Cleanup is run at the end of a session, once all ConsumeClaim goroutines have exited117/​/​ func (p *Consumer) Cleanup(sarama.ConsumerGroupSession) error {118/​/​ return nil119/​/​ }120/​/​ /​/​ ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages().121/​/​ func (p *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {122/​/​ /​/​ NOTE:123/​/​ /​/​ Do not move the code below to a goroutine.124/​/​ /​/​ The `ConsumeClaim` itself is called within a goroutine, see:125/​/​ /​/​ https:/​/​github.com/​Shopify/​sarama/​blob/​master/​consumer_group.go#L27-L29126/​/​ /​/​ 具体消费消息127/​/​ if *config.Config.ChOpen {128/​/​ for message := range claim.Messages() {129/​/​ msg := string(message.Value)130/​/​ p.chPool <- msg131/​/​ glog.Infof("msg: %s, %v, %v", msg, config.Config.ChOpen)132/​/​ time.Sleep(time.Second)133/​/​ /​/​ 更新位移134/​/​ session.MarkMessage(message, "")135/​/​ }136/​/​ } else {137/​/​ glog.Infof("暂停消费msg:%v.", config.Config.ChOpen)138/​/​ time.Sleep(time.Second)139/​/​ }140/​/​ /​*141/​/​ for {142/​/​ /​/​ if len(p.chOpen) == 0 {143/​/​ select {144/​/​ case p.chOpen <- 1:145/​/​ case message, ok := <-claim.Messages():146/​/​ if !ok {147/​/​ continue148/​/​ }149/​/​ msg := string(message.Value)150/​/​ <-p.chOpen151/​/​ p.chPool <- msg152/​/​ glog.Infof("msg: %s, %v, %v", msg, len(p.chOpen), &p.chOpen)153/​/​ time.Sleep(time.Second)154/​/​ /​/​ 更新位移155/​/​ session.MarkMessage(message, "")156/​/​ continue157/​/​ default:158/​/​ glog.Infof("msg default.")159/​/​ /​/​ time.Sleep(time.Second)160/​/​ break161/​/​ }162/​/​ /​/​ } else {163/​/​ /​/​ time.Sleep(time.Second)164/​/​ /​/​ }165/​/​ }166/​/​ */​167/​/​ glog.Infof("ConsumeClaim...")168/​/​ return nil169/​/​ }170/​/​ /​/​ func main() {171/​/​ /​/​ k := NewKafka()172/​/​ /​/​ f := k.Init()173/​/​ /​/​ sigterm := make(chan os.Signal, 1)174/​/​ /​/​ signal.Notify(sigterm, syscall.SIGINT, syscall.SIGTERM)175/​/​ /​/​ select {176/​/​ /​/​ case <-sigterm:177/​/​ /​/​ glog.Infof("terminating: via signal")178/​/​ /​/​ }179/​/​ /​/​ f()180/​/​ /​/​ }181/​/​ /​*...

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kafka.go

Source: kafka.go Github

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...30 return nil31}32/​/​ Cleanup sarama.ConsumerGroupHandler接口定义实现.33/​/​ Cleanup() hook is called to allow the user to perform any final tasks34/​/​ before a rebalance once all the ConsumeClaim() loops have exited.35func (h *CustomConsumerGroupHandler) Cleanup(session sarama.ConsumerGroupSession) error {36 return nil37}38/​/​ ConsumeClaim sarama.ConsumerGroupHandler接口定义实现.39/​/​ ConsumeClaim() hook is called for each of the assigned claims.40func (h *CustomConsumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {41 for {42 select {43 case <-session.Context().Done():44 {45 log.Info().Msg("consumer group claim, context done")46 return nil47 }48 case msg, ok := <-claim.Messages():49 {50 if !ok {51 log.Warn().Msg("consumer group claim, messages channel closed")52 return nil53 }54 h.msgCh <- msg55 session.MarkMessage(msg, "")56 }57 }58 }59}60/​/​ Close 关闭并释放所有资源 (并发安全).61func (h *CustomConsumerGroupHandler) Close() {62 h.once.Do(func() { h.closer() })63 log.Info().Msg("unload kafka plugin")64}65/​/​ NewCustomConsumerGroupHandler 新建消费者.66func NewCustomConsumerGroupHandler(cfg *conf.KafkaConfig) (*CustomConsumerGroupHandler, error) {67 h := &CustomConsumerGroupHandler{68 cfg: cfg,69 msgCh: make(chan *sarama.ConsumerMessage),70 readyCh: make(chan struct{}),71 }72 var err error73 sc := sarama.NewConfig()74 sc.Version, err = sarama.ParseKafkaVersion(h.cfg.Version)75 if cfg.FromOldest {76 sc.Consumer.Offsets.Initial = sarama.OffsetOldest77 }78 if err != nil {79 log.Error().Err(err).Msgf("unsupported kafka version %s", h.cfg.Version)80 return nil, err81 }82 setKafkaAccessSettings(sc)83 h.consumerGroup, err = sarama.NewConsumerGroup(h.cfg.Brokers, h.cfg.ConsumeGroup, sc)84 if err != nil {85 log.Error().Err(err).Msgf("cannot create consumer group for brokers <%v>", h.cfg.Brokers)86 return nil, err87 }88 ctx, cancel := context.WithCancel(context.Background())89 kGroup := new(sync.WaitGroup)90 kGroup.Add(1)91 go func() {92 defer kGroup.Done()93 h.start(ctx, h.cfg.Topic)94 }()95 /​/​ 消费组准备完毕96 <-h.readyCh97 h.closer = func() {98 cancel()99 h.consumerGroup.Close()100 close(h.msgCh)101 kGroup.Wait()102 }103 log.Info().Msgf("load kafka plugin, version %s", h.cfg.Version)104 return h, nil105}106func (h *CustomConsumerGroupHandler) start(ctx context.Context, topics []string) {107 for {108 /​/​ Consume joins a cluster of consumers for a given list of topics and109 /​/​ starts a blocking ConsumerGroupSession through the ConsumerGroupHandler.110 if err := h.consumerGroup.Consume(ctx, topics, h); err != nil {111 log.Error().Err(err).Msg("error occurs inside consumer group")112 }113 /​/​ 1. The consumers join the group (as explained in https:/​/​kafka.apache.org/​documentation/​#intro_consumers)114 /​/​ and is assigned their "fair share" of partitions, aka 'claims'.115 /​/​ 2. Before processing starts, the handler's Setup() hook is called to notify the user116 /​/​ of the claims and allow any necessary preparation or alteration of state.117 /​/​ 3. For each of the assigned claims the handler's ConsumeClaim() function is then called118 /​/​ in a separate goroutine which requires it to be thread-safe. Any state must be carefully protected119 /​/​ from concurrent reads/​writes.120 /​/​ 4. The session will persist until one of the ConsumeClaim() functions exits. This can be either when the121 /​/​ parent context is cancelled or when a server-side rebalance cycle is initiated.122 /​/​ 5. Once all the ConsumeClaim() loops have exited, the handler's Cleanup() hook is called123 /​/​ to allow the user to perform any final tasks before a rebalance.124 /​/​ 6. Finally, marked offsets are committed one last time before claims are released.125 /​/​126 /​/​ Please note, that once a rebalance is triggered, sessions must be completed within127 /​/​ Config.Consumer.Group.Rebalance.Timeout. This means that ConsumeClaim() functions must exit128 /​/​ as quickly as possible to allow time for Cleanup() and the final offset commit. If the timeout129 /​/​ is exceeded, the consumer will be removed from the group by Kafka, which will cause offset130 /​/​ commit failures.131 select {132 case <-ctx.Done():133 {134 log.Info().Msg("consumer group context done ...")135 return136 }137 case err := <-h.consumerGroup.Errors():138 {139 log.Error().Err(err).Msg("error occurs inside consumer group")140 }141 default:...

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ConsumeClaim

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1func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {2 for message := range claim.Messages() {3 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s4", string(message.Value), message.Timestamp, message.Topic)5 session.MarkMessage(message, "")6 }7}8func (c *Consumer) Consume(ctx context.Context) {9 for {10 topics := []string{"test"}11 err := c.consumer.Consume(ctx, topics, handler)12 if err != nil {13 panic(err)14 }15 if ctx.Err() != nil {16 }17 }18}19func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {20 for message := range claim.Messages() {21 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s22", string(message.Value), message.Timestamp, message.Topic)23 session.MarkMessage(message, "")24 }25}26func (c *Consumer) Consume(ctx context.Context) {27 for {28 topics := []string{"test"}29 err := c.consumer.Consume(ctx, topics, handler)30 if err != nil {31 panic(err)32 }33 if ctx.Err() != nil {34 }35 }36}37func (c *Consumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {38 for message := range claim.Messages() {39 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s40", string(message.Value), message.Timestamp, message.Topic)41 session.MarkMessage(message, "")42 }43}44func (c *Consumer) Consume(ctx context.Context) {45 for {

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ConsumeClaim

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1func (c *KafkaConsumer) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {2 for msg := range claim.Messages() {3 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s4", string(msg.Value), msg.Timestamp, msg.Topic)5 session.MarkMessage(msg, "")6 }7}8func (c *KafkaConsumer) Close() error {9 if err := c.consumer.Close(); err != nil {10 }11}12func (c *KafkaConsumer) Setup(sarama.ConsumerGroupSession) error { return nil }13func (c *KafkaConsumer) Cleanup(sarama.ConsumerGroupSession) error { return nil }14func (c *KafkaConsumer) Run() {15 for {16 if err := c.consumer.Consume(context.Background(), []string{c.topic}, c); err != nil {17 fmt.Println(err)18 }19 if ctx.Err() != nil {20 }21 c.ready = make(chan bool)22 }23}24func NewConsumerGroup(brokers, topic, group string) (*KafkaConsumer, error) {25 config := sarama.NewConfig()26 client, err := sarama.NewConsumerGroup(strings.Split(brokers, ","), group, config)27 if err != nil {28 }29 return &KafkaConsumer{30 ready: make(chan bool),31 }, nil32}33func main() {

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ConsumeClaim

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1func (c *Consumer) ConsumeClaim(sess sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {2 for message := range claim.Messages() {3 fmt.Fprintf(os.Stdout, "Message claimed: value = %s, timestamp = %v, topic = %s4", string(message.Value), message.Timestamp, message.Topic)5 sess.MarkMessage(message, "")6 }7}8func main() {9 config := sarama.NewConfig()10 consumer := Consumer{}11 client, err := sarama.NewClient([]string{"localhost:9092"}, config)12 if err != nil {13 fmt.Println("Error creating client: ", err)14 }15 consumerGroup, err := sarama.NewConsumerGroupFromClient("my-group", client)16 if err != nil {17 fmt.Println("Error creating consumer group client: ", err)18 }19 defer func() {20 if err := consumerGroup.Close(); err != nil {21 fmt.Println("Error closing client: ", err)22 }23 }()24 for {25 ctx, cancel := context.WithCancel(context.Background())26 go func() {27 for err := range consumerGroup.Errors() {28 fmt.Println("Error from consumer: ", err)29 }30 }()31 go func() {32 for {33 if err := consumerGroup.Consume(ctx, []string{"my-topic"}, &consumer); err != nil {34 fmt.Println("Error from consumer: ", err)35 }36 if ctx.Err() != nil {37 }38 cancel()

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ConsumeClaim

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1import (2var (3func main() {4 config := sarama.NewConfig()5 brokers := []string{"localhost:9092"}6 topics := []string{"test"}7 consumer, err := sarama.NewConsumer(brokers, config)8 if err != nil {9 panic(err)10 }11 defer func() {12 if err := consumer.Close(); err != nil {13 panic(err)14 }15 }()16 signals := make(chan os.Signal, 1)17 signal.Notify(signals, os.Interrupt)18 partitionList, err := consumer.Partitions(topics[0])19 if err != nil {20 panic(err)21 }22 for partition := range partitionList {23 pc, err := consumer.ConsumePartition(topics[0], int32(partition), sarama.OffsetNewest)24 if err != nil {25 panic(err)26 }27 defer pc.AsyncClose()28 wg.Add(1)29 go func(sarama.PartitionConsumer) {30 defer wg.Done()31 for msg := range pc.Messages() {32 fmt.Printf("Partition:\t%d33 fmt.Printf("Offset:\t%d34 fmt.Printf("Key:\t%s35", string(msg.Key))36 fmt.Printf("Value:\t%s37", string(msg.Value))38 }39 }(pc)40 }41 wg.Wait()42 fmt.Println("Done consuming topic", topics[0])43}44import (45var (46func main() {47 config := sarama.NewConfig()48 brokers := []string{"localhost:9092"}49 topics := []string{"test"}

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ConsumeClaim

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1import (2func main() {3 wg.Add(1)4 go func() {5 defer wg.Done()6 config := sarama.NewConfig()7 brokers := []string{"localhost:9092"}8 consumer, err := sarama.NewConsumer(brokers, config)9 if err != nil {10 panic(err)11 }12 defer func() {13 if err := consumer.Close(); err != nil {14 panic(err)15 }16 }()17 groups, err := consumer.ListGroups()18 if err != nil {19 panic(err)20 }21 fmt.Println("Consumer Groups:", groups)22 partitionConsumer, err := consumer.ConsumePartition("test", 0, sarama.OffsetNewest)23 if err != nil {24 panic(err)25 }26 defer func() {27 if err := partitionConsumer.Close(); err != nil {28 panic(err)29 }30 }()31 signals := make(chan os.Signal, 1)32 signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)33 doneCh := make(chan struct{})34 go func() {35 for {36 select {37 case msg := <-partitionConsumer.Messages():38 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s\n", string(msg.Value), msg.Timestamp, msg.Topic)39 case err := <-partitionConsumer.Errors():40 fmt.Printf("Error: %s41", err.Error())42 fmt.Println("Interrupt is detected")43 doneCh <- struct{}{}44 }45 }46 }()47 fmt.Println("Done consuming topic test")48 }()49 wg.Wait()50}

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ConsumeClaim

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1import (2func main() {3 config := sarama.NewConfig()4 group, err := sarama.NewConsumerGroup([]string{"localhost:9092"}, "my-group", config)5 if err != nil {6 panic(err)7 }8 defer func() {9 if err := group.Close(); err != nil {10 panic(err)11 }12 }()13 go func() {14 for err := range group.Errors() {15 fmt.Println(err)16 }17 }()18 for {19 topics := []string{"my-topic"}20 handler := &consumerGroupHandler{}21 err := group.Consume(context.Background(), topics, handler)22 if err != nil {23 panic(err)24 }25 }26}27import (28func main() {29 config := sarama.NewConfig()30 group, err := sarama.NewConsumerGroup([]string{"localhost:9092"}, "my-group", config)31 if err != nil {32 panic(err)33 }34 defer func() {35 if err := group.Close(); err != nil {36 panic(err)37 }38 }()39 go func() {40 for err := range group.Errors() {41 fmt.Println(err)42 }43 }()44 for {45 topics := []string{"my-topic"}46 handler := &consumerGroupHandler{}47 err := group.Consume(context.Background(), topics, handler)48 if err != nil {49 panic(err)50 }51 }52}53import (54func main() {55 config := sarama.NewConfig()

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ConsumeClaim

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1func main() {2 fmt.Println("Consumer")3 p := kafka.NewConsumer(&kafka.ConfigMap{4 })5 p.SubscribeTopics([]string{"myTopic", "^aRegex.*[Tt]opic"}, nil)6 for run == true {7 msg, err := p.ReadMessage(-1)8 if err == nil {9 fmt.Printf("Message on %s: %s\n", msg.TopicPartition, string(msg.Value))10 } else {11 fmt.Printf("Consumer error: %v (%v)\n", err, msg)12 }13 }14 fmt.Printf("Closing consumer\n")15 p.Close()16}17func main() {18 fmt.Println("Consumer")19 p := kafka.NewConsumer(&kafka.ConfigMap{20 })21 p.SubscribeTopics([]string{"myTopic", "^aRegex.*[Tt]opic"}, nil)22 for run == true {23 ev := p.Poll(100)24 if ev == nil {25 }26 switch e := ev.(type) {27 fmt.Printf("Message on %s: %s\n", e.TopicPartition, string(e.Value))28 fmt.Fprintf(os.Stderr, "%% Error: %v: %v29", e.Code(), e)30 fmt.Printf("Ignored %v31 }32 }33 fmt.Printf("Closing consumer\n")34 p.Close()35}36func main() {37 fmt.Println("Consumer")38 p := kafka.NewConsumer(&kafka.ConfigMap{39 })40 p.SubscribeTopics([]string{"myTopic", "^aRegex.*[Tt]opic"}, nil)

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ConsumeClaim

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1import (2type Consumer struct {3}4func (c *Consumer) ConsumeClaim(sess sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {5 defer sess.MarkMessage(claim.Messages()[0], "")6 for message := range claim.Messages() {7 fmt.Printf("Message claimed: value = %s, timestamp = %v, topic = %s8", string(message.Value), message.Timestamp, message.Topic)9 }10}11func (c *Consumer) Setup(sess sarama.ConsumerGroupSession) error {12 close(c.ready)13}14func (c *Consumer) Cleanup(sarama.ConsumerGroupSession) error {15}16func main() {17 config := sarama.NewConfig()18 client, err := sarama.NewClient([]string{"localhost:9092"}, config)19 if err != nil {20 panic(err)21 }22 consumer, err := sarama.NewConsumerGroupFromClient("my-group", client)23 if err != nil {24 panic(err)25 }26 signals := make(chan os.Signal, 1)27 signal.Notify(signals, os.Interrupt)28 go func() {29 for err := range consumer.Errors() {30 fmt.Println(err)31 }32 }()33 go func() {34 for ntf := range consumer.Notifications() {35 fmt.Println(ntf)36 }37 }()38 for {39 select {40 handler := Consumer{41 ready: make(chan bool),42 }43 ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)44 defer cancel()45 if err := consumer.Consume(ctx

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