71 lines
1.2 KiB
Go
71 lines
1.2 KiB
Go
package consumer
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import (
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"context"
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"fmt"
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"sync"
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"github.com/segmentio/kafka-go"
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)
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type Consumer interface {
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Start() error
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Stop() error
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}
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func New() Consumer {
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return &KafkaConsumer{}
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}
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type KafkaConsumer struct {
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Consumer
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reader *kafka.Reader
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stopChan chan struct{}
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stopWg sync.WaitGroup
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}
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func (kc *KafkaConsumer) Start() error {
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if kc.stopChan != nil {
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return fmt.Errorf("Consumer: already running. Stop it before starting it again")
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}
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kc.stopChan = make(chan struct{})
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kc.reader = kafka.NewReader(kafka.ReaderConfig{
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Brokers: []string{"192.168.1.50:9092"},
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GroupID: "overflow-metric-group-id",
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Topic: "overflow-metric-topic",
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MinBytes: 10e3, // 10KB
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MaxBytes: 10e6, // 10MB
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})
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if nil == kc.reader {
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return fmt.Errorf("Consumer: cannot start kafka reader")
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}
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kc.stopWg.Add(1)
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go handleRun(kc)
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return nil
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}
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func (kc *KafkaConsumer) Stop() error {
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return nil
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}
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func handleRun(kc *KafkaConsumer) {
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defer func() {
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kc.stopWg.Done()
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}()
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for {
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m, err := kc.reader.ReadMessage(context.Background())
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if err != nil {
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break
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}
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fmt.Printf("message at topic/partition/offset %v/%v/%v: %s = %s\n", m.Topic, m.Partition, m.Offset, string(m.Key), string(m.Value))
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}
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}
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