/
message.go
159 lines (136 loc) · 3.63 KB
/
message.go
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package kafka
import (
"context"
"time"
kcronsumer "github.com/Trendyol/kafka-cronsumer/pkg/kafka"
"github.com/segmentio/kafka-go"
"github.com/segmentio/kafka-go/protocol"
)
const (
errMessageKey = "x-error-message"
)
type Header = protocol.Header
type Message struct {
Time time.Time
WriterData interface{}
// Context To enable distributed tracing support
Context context.Context
Topic string
Key []byte
Value []byte
Headers []Header
Partition int
Offset int64
HighWaterMark int64
// IsFailed Is only used on transactional retry disabled
IsFailed bool
// ErrDescription specifies the IsFailed message's error
// If available, kafka-konsumer writes this description into the failed message's
// headers as `x-error-message` key when producing retry topic
ErrDescription string
}
type IncomingMessage struct {
kafkaMessage *kafka.Message
message *Message
}
func (m *Message) toKafkaMessage() kafka.Message {
return kafka.Message{
Topic: m.Topic,
Partition: m.Partition,
Offset: m.Offset,
HighWaterMark: m.HighWaterMark,
Key: m.Key,
Value: m.Value,
Headers: m.Headers,
WriterData: m.WriterData,
Time: m.Time,
}
}
func fromKafkaMessage(kafkaMessage *kafka.Message) *Message {
message := &Message{}
message.Topic = kafkaMessage.Topic
message.Partition = kafkaMessage.Partition
message.Offset = kafkaMessage.Offset
message.HighWaterMark = kafkaMessage.HighWaterMark
message.Key = kafkaMessage.Key
message.Value = kafkaMessage.Value
message.Headers = kafkaMessage.Headers
message.WriterData = kafkaMessage.WriterData
message.Time = kafkaMessage.Time
message.Context = context.TODO()
return message
}
func (m *Message) toRetryableMessage(retryTopic, consumeError string) kcronsumer.Message {
headers := make([]kcronsumer.Header, 0, len(m.Headers))
for i := range m.Headers {
headers = append(headers, kcronsumer.Header{
Key: m.Headers[i].Key,
Value: m.Headers[i].Value,
})
}
if m.ErrDescription == "" {
headers = append(headers, kcronsumer.Header{
Key: errMessageKey,
Value: []byte(consumeError),
})
} else {
headers = append(headers, kcronsumer.Header{
Key: errMessageKey,
Value: []byte(m.ErrDescription),
})
}
return kcronsumer.NewMessageBuilder().
WithKey(m.Key).
WithValue(m.Value).
WithTopic(retryTopic).
WithHeaders(headers).
WithPartition(m.Partition).
WithHighWatermark(m.HighWaterMark).
Build()
}
func toMessage(message kcronsumer.Message) *Message {
headers := make([]protocol.Header, 0, len(message.Headers))
for i := range message.Headers {
headers = append(headers, protocol.Header{
Key: message.Headers[i].Key,
Value: message.Headers[i].Value,
})
}
msg := &Message{}
msg.Topic = message.Topic
msg.Partition = message.Partition
msg.Offset = message.Offset
msg.HighWaterMark = message.HighWaterMark
msg.Key = message.Key
msg.Value = message.Value
msg.Headers = headers
msg.Time = message.Time
msg.Context = context.Background()
return msg
}
func (m *Message) Header(key string) *kafka.Header {
for i, header := range m.Headers {
if header.Key == key {
return &m.Headers[i]
}
}
return nil
}
// AddHeader works as a idempotent function
func (m *Message) AddHeader(header Header) {
for i := range m.Headers {
if m.Headers[i].Key == header.Key {
m.Headers[i].Value = header.Value
return
}
}
m.Headers = append(m.Headers, header)
}
func (m *Message) RemoveHeader(header Header) {
for i, h := range m.Headers {
if h.Key == header.Key {
m.Headers = append(m.Headers[:i], m.Headers[i+1:]...)
break
}
}
}