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104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
package main
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import (
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"encoding/json"
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"io"
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"log"
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"strings"
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"time"
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"github.com/buger/goreplay/proto"
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"github.com/Shopify/sarama"
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"github.com/Shopify/sarama/mocks"
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)
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// KafkaOutput is used for sending payloads to kafka in JSON format.
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type KafkaOutput struct {
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config *OutputKafkaConfig
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producer sarama.AsyncProducer
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}
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// KafkaOutputFrequency in milliseconds
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const KafkaOutputFrequency = 500
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// NewKafkaOutput creates instance of kafka producer client.
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func NewKafkaOutput(address string, config *OutputKafkaConfig) io.Writer {
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return NewKafkaOutputWithTLS(address, config, nil)
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}
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// NewKafkaOutputWithTLS creates instance of kafka producer client.
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func NewKafkaOutputWithTLS(address string, config *OutputKafkaConfig, tlsConfig *KafkaTLSConfig) io.Writer {
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c := NewKafkaConfig(tlsConfig)
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var producer sarama.AsyncProducer
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if mock, ok := config.producer.(*mocks.AsyncProducer); ok && mock != nil {
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producer = config.producer
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} else {
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c.Producer.RequiredAcks = sarama.WaitForLocal
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c.Producer.Compression = sarama.CompressionSnappy
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c.Producer.Flush.Frequency = KafkaOutputFrequency * time.Millisecond
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brokerList := strings.Split(config.Host, ",")
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var err error
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producer, err = sarama.NewAsyncProducer(brokerList, c)
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if err != nil {
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log.Fatalln("Failed to start Sarama(Kafka) producer:", err)
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}
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}
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o := &KafkaOutput{
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config: config,
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producer: producer,
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}
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// Start infinite loop for tracking errors for kafka producer.
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go o.ErrorHandler()
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return o
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}
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// ErrorHandler should receive errors
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func (o *KafkaOutput) ErrorHandler() {
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for err := range o.producer.Errors() {
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Debug(1, "Failed to write access log entry:", err)
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}
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}
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func (o *KafkaOutput) Write(data []byte) (n int, err error) {
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var message sarama.StringEncoder
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if !o.config.UseJSON {
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message = sarama.StringEncoder(data)
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} else {
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headers := make(map[string]string)
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proto.ParseHeaders([][]byte{data}, func(header []byte, value []byte) {
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headers[string(header)] = string(value)
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})
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meta := payloadMeta(data)
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req := payloadBody(data)
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kafkaMessage := KafkaMessage{
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ReqURL: string(proto.Path(req)),
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ReqType: string(meta[0]),
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ReqID: string(meta[1]),
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ReqTs: string(meta[2]),
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ReqMethod: string(proto.Method(req)),
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ReqBody: string(proto.Body(req)),
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ReqHeaders: headers,
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}
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jsonMessage, _ := json.Marshal(&kafkaMessage)
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message = sarama.StringEncoder(jsonMessage)
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}
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o.producer.Input() <- &sarama.ProducerMessage{
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Topic: o.config.Topic,
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Value: message,
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}
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return len(message), nil
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}
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