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consumer.go
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consumer.go
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package main
import (
"fmt"
"log/slog"
"sync"
"github.com/IBM/sarama"
"github.com/spf13/cobra"
)
func consumerCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "consumer",
Short: "consumer",
Run: func(cmd *cobra.Command, args []string) {
},
}
cmd.AddCommand(consumerConsoleCmd())
return cmd
}
func consumerConsoleCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "console",
RunE: func(cmd *cobra.Command, args []string) error {
consumer, err := newConsumer()
if err != nil {
return fmt.Errorf("newConsumer error: %w", err)
}
defer func() {
if err := consumer.Close(); err != nil {
slog.Error("consumer.Close failed", err)
}
}()
topic, err := cmd.Flags().GetString("topic")
if err != nil {
return fmt.Errorf("get topic flag error: %w", err)
}
partition, err := cmd.Flags().GetInt32("partition")
if err != nil {
return fmt.Errorf("get partition flag error: %w", err)
}
// Partition flag not specified
var partitions []int32
if partition == -1 {
var err error
partitions, err = consumer.Partitions(topic)
if err != nil {
return fmt.Errorf("consumer.Partitions error: %w", err)
}
} else {
partitions = []int32{partition}
}
var wg sync.WaitGroup
msgCh := make(chan string, 10)
for _, partition := range partitions {
wg.Add(1)
go func(partition int32) {
defer wg.Done()
partitionConsumer, err := consumer.ConsumePartition(topic, partition, sarama.OffsetNewest)
if err != nil {
slog.Error("consumer.ConsumePartition failed", err)
return
}
for msg := range partitionConsumer.Messages() {
msgCh <- string(msg.Value)
}
}(partition)
}
go func() {
for msg := range msgCh {
fmt.Println(msg)
}
}()
wg.Wait()
return nil
},
}
cmd.Flags().StringP("topic", "t", "", "The topic to consume from")
cmd.Flags().Int32P("partition", "p", -1, "The partition to consume from.")
return cmd
}