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update.go
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update.go
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// Copyright (c) 2022 Fujitsu Limited
package publish
import (
"fmt"
"github.com/segmentio/kafka-go"
"github.com/segmentio/kafka-go/gzip"
"github.com/segmentio/kafka-go/lz4"
"github.com/segmentio/kafka-go/snappy"
"github.com/segmentio/kafka-go/zstd"
"github.com/FujitsuResearch/data-sharing-controllers-on-k8s/pkg/messagequeue"
"github.com/FujitsuResearch/data-sharing-controllers-on-k8s/pkg/util"
)
type MessageQueueUpdatePublisher struct {
updateWriter *kafka.Writer
maxBatchSize int
}
func getCompressionCodec(
compressionCodec string) (kafka.CompressionCodec, error) {
switch compressionCodec {
case CompressionCodecNone:
return nil, nil
case CompressionCodecGzip:
return gzip.NewCompressionCodec(), nil
case CompressionCodecSnappy:
return snappy.NewCompressionCodec(), nil
case CompressionCodecLz4:
return lz4.NewCompressionCodec(), nil
case CompressionCodecZstd:
return zstd.NewCompressionCodec(), nil
default:
return nil, fmt.Errorf(
"Not support such a compression codec: %q", compressionCodec)
}
}
func NewMessageQueueUpdatePublisher(
messageQueueConfig *messagequeue.MessageQueueConfig, topic string,
compressionCodecOption string, maxBatchBytes int) (
*MessageQueueUpdatePublisher, error) {
dialer, err := messageQueueConfig.CreateSaslDialer()
if err != nil {
return nil, err
}
updateWriterConfig := kafka.WriterConfig{
Brokers: messageQueueConfig.GetBrokers(),
Topic: topic,
Dialer: dialer,
}
if maxBatchBytes != 0 {
updateWriterConfig.BatchBytes = maxBatchBytes
} else {
updateWriterConfig.BatchBytes = messagequeue.DefaultMaxBatchBytes
}
compressionCodec, err := getCompressionCodec(compressionCodecOption)
if err != nil {
return nil, err
}
if compressionCodec != nil {
updateWriterConfig.CompressionCodec = compressionCodec
}
brokerAddress := messageQueueConfig.GetBrokers()[0]
topics := []string{
topic,
}
err = messagequeue.CreateTopics(brokerAddress, dialer, topics)
if err != nil {
return nil, err
}
return &MessageQueueUpdatePublisher{
// [TODO] NewWriter() is deprecated
updateWriter: kafka.NewWriter(updateWriterConfig),
maxBatchSize: updateWriterConfig.BatchBytes,
}, nil
}
func (mqup *MessageQueueUpdatePublisher) CloseMessageQueue() error {
err := mqup.updateWriter.Close()
if err != nil {
return fmt.Errorf(
"Failed to close the 'update' publisher: %v", err.Error())
}
return nil
}
func (mqup *MessageQueueUpdatePublisher) GetMaxBatchSize() int {
return mqup.maxBatchSize
}
func (mqup *MessageQueueUpdatePublisher) WriteQueueMessages(
messages []kafka.Message) error {
ctx, cancel := util.GetTimeoutContext(util.DefaultMessageQueueTimeout)
defer cancel()
return mqup.updateWriter.WriteMessages(ctx, messages...)
}