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97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package main
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import (
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"encoding/json"
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"github.com/Shopify/sarama"
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"github.com/buger/gor/proto"
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"io"
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"log"
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"strings"
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"time"
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)
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// KafkaConfig should contains required information to
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// build producers.
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type KafkaConfig struct {
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host string
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topic string
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}
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// KafkaOutput should make producer client.
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type KafkaOutput struct {
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config *KafkaConfig
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producer sarama.AsyncProducer
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}
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// KafkaMessage should contains catched request information that should be
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// passed as Json to Apache Kafka.
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type KafkaMessage struct {
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ReqURL string `json:"Req_URL"`
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ReqMethod string `json:"Req_Method"`
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ReqBody string `json:"Req_Body,omitempty"`
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ReqHeaders map[string]string `json:"Req_Headers,omitempty"`
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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 *KafkaConfig) io.Writer {
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c := sarama.NewConfig()
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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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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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o := &KafkaOutput{
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config: config,
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producer: producer,
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}
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if Settings.verbose {
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// Start infinite loop for tracking errors for kafka producer.
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go o.ErrorHandler()
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}
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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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log.Println("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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headers := make(map[string]string)
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proto.ParseHeaders([][]byte{data}, func(header []byte, value []byte) bool {
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headers[string(header)] = string(value)
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return true
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})
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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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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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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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