/
util.go
168 lines (145 loc) · 3.34 KB
/
util.go
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package kafka
import (
"context"
"encoding/json"
"fmt"
"github.com/google/uuid"
"github.com/hashicorp/go-multierror"
"github.com/rs/zerolog/log"
"io"
"net"
"strconv"
"time"
"github.com/segmentio/kafka-go"
)
const (
KeyCorrelationID = "correlation_id"
)
func logdf(msg string, a ...interface{}) {
log.Debug().Msgf(msg, a...)
}
func logef(msg string, a ...interface{}) {
log.Error().Msgf(msg, a...)
}
func newReader(brokers []string, group string, topic string) (*kafka.Reader, error) {
config := kafka.ReaderConfig{
Brokers: brokers,
Topic: topic,
GroupID: group,
Logger: kafka.LoggerFunc(logdf),
ErrorLogger: kafka.LoggerFunc(logef),
}
err := config.Validate()
if err != nil {
return nil, fmt.Errorf("invalid kafka config: %w", err)
}
return kafka.NewReader(config), nil
}
func newWriter(brokers []string, topic string) *kafka.Writer {
return &kafka.Writer{
Addr: kafka.TCP(brokers...),
Topic: topic,
Balancer: &kafka.LeastBytes{},
Logger: kafka.LoggerFunc(logdf),
ErrorLogger: kafka.LoggerFunc(logef),
}
}
func readDTO(ctx context.Context, reader *kafka.Reader, obj interface{}) (string, error) {
m, err := reader.ReadMessage(ctx)
if err != nil {
log.Error().Err(err).Msg("error receiving message")
return "", err
}
err = json.Unmarshal(m.Value, obj)
if err != nil {
log.Error().Err(err).Msg("failed to unmarshal message")
return "", err
}
for _, h := range m.Headers {
if h.Key == KeyCorrelationID {
return string(h.Value), nil
}
}
return "", nil
}
func write(writer *kafka.Writer, key string, msg interface{}, correlationID string) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
bs, err := json.Marshal(msg)
if err != nil {
log.Error().Err(err).Msg("failed to marshal outcoming message")
return
}
kmsg := kafka.Message{
Key: []byte(key),
Value: bs,
}
if len(correlationID) > 0 {
kmsg.Headers = []kafka.Header{
{
Key: KeyCorrelationID,
Value: []byte(correlationID),
},
}
}
err = writer.WriteMessages(ctx, kmsg)
if err != nil {
log.Error().Err(err).Msg("failed to write message")
}
}
func generateCorrelationID() string {
return uuid.NewString()
}
func checkCorrelationID(msg kafka.Message, correlationID string) bool {
for _, h := range msg.Headers {
if h.Key == KeyCorrelationID {
return correlationID == string(h.Value)
}
}
return false
}
func closeAll(closers ...io.Closer) error {
var result error
for _, closer := range closers {
err := closer.Close()
if err != nil {
result = multierror.Append(result, err)
}
}
return result
}
func createTopics(broker string, topics ...string) error {
var conn *kafka.Conn
var err error
for i := 0; i < 5; i++ {
conn, err = kafka.Dial("tcp", broker)
if err == nil {
break
}
time.Sleep(3 * time.Second)
}
if err != nil {
return err
}
defer conn.Close()
controller, err := conn.Controller()
if err != nil {
return err
}
controllerConn, err := kafka.Dial("tcp", net.JoinHostPort(controller.Host, strconv.Itoa(controller.Port)))
if err != nil {
return err
}
defer controllerConn.Close()
for _, topic := range topics {
err := controllerConn.CreateTopics(kafka.TopicConfig{
Topic: topic,
NumPartitions: 1,
ReplicationFactor: 1,
})
if err != nil {
return err
}
}
return nil
}