Exemplo n.º 1
0
func (s *Server) withAccessLog(next http.Handler) http.Handler {

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		started := time.Now()

		next.ServeHTTP(w, r)

		entry := &accessLogEntry{
			Method:       r.Method,
			Host:         r.Host,
			Path:         r.RequestURI,
			IP:           r.RemoteAddr,
			ResponseTime: float64(time.Since(started)) / float64(time.Second),
		}

		// We will use the client's IP address as key. This will cause
		// all the access log entries of the same IP address to end up
		// on the same partition.
		s.AccessLogProducer.Input() <- &sarama.ProducerMessage{
			Topic: "access_log",
			Key:   sarama.StringEncoder(r.RemoteAddr),
			Value: entry,
		}
	})
}
Exemplo n.º 2
0
func (s *Server) collectQueryStringData() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/" {
			http.NotFound(w, r)
			return
		}

		// We are not setting a message key, which means that all messages will
		// be distributed randomly over the different partitions.
		partition, offset, err := s.DataCollector.SendMessage(&sarama.ProducerMessage{
			Topic: "important",
			Value: sarama.StringEncoder(r.URL.RawQuery),
		})

		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			fmt.Fprintf(w, "Failed to store your data:, %s", err)
		} else {
			// The tuple (topic, partition, offset) can be used as a unique identifier
			// for a message in a Kafka cluster.
			fmt.Fprintf(w, "Your data is stored with unique identifier important/%d/%d", partition, offset)
		}
	})
}
Exemplo n.º 3
0
func main() {
	flag.Parse()

	if *brokerList == "" {
		printUsageErrorAndExit("no -brokers specified. Alternatively, set the KAFKA_PEERS environment variable")
	}

	if *topic == "" {
		printUsageErrorAndExit("no -topic specified")
	}

	if *verbose {
		sarama.Logger = logger
	}

	config := sarama.NewConfig()
	config.Producer.RequiredAcks = sarama.WaitForAll

	switch *partitioner {
	case "":
		if *partition >= 0 {
			config.Producer.Partitioner = sarama.NewManualPartitioner
		} else {
			config.Producer.Partitioner = sarama.NewHashPartitioner
		}
	case "hash":
		config.Producer.Partitioner = sarama.NewHashPartitioner
	case "random":
		config.Producer.Partitioner = sarama.NewRandomPartitioner
	case "manual":
		config.Producer.Partitioner = sarama.NewManualPartitioner
		if *partition == -1 {
			printUsageErrorAndExit("-partition is required when partitioning manually")
		}
	default:
		printUsageErrorAndExit(fmt.Sprintf("Partitioner %s not supported.", *partitioner))
	}

	message := &sarama.ProducerMessage{Topic: *topic, Partition: int32(*partition)}

	if *key != "" {
		message.Key = sarama.StringEncoder(*key)
	}

	if *value != "" {
		message.Value = sarama.StringEncoder(*value)
	} else if stdinAvailable() {
		bytes, err := ioutil.ReadAll(os.Stdin)
		if err != nil {
			printErrorAndExit(66, "Failed to read data from the standard input: %s", err)
		}
		message.Value = sarama.ByteEncoder(bytes)
	} else {
		printUsageErrorAndExit("-value is required, or you have to provide the value on stdin")
	}

	producer, err := sarama.NewSyncProducer(strings.Split(*brokerList, ","), config)
	if err != nil {
		printErrorAndExit(69, "Failed to open Kafka producer: %s", err)
	}
	defer func() {
		if err := producer.Close(); err != nil {
			logger.Println("Failed to close Kafka producer cleanly:", err)
		}
	}()

	partition, offset, err := producer.SendMessage(message)
	if err != nil {
		printErrorAndExit(69, "Failed to produce message: %s", err)
	} else if !*silent {
		fmt.Printf("topic=%s\tpartition=%d\toffset=%d\n", *topic, partition, offset)
	}
}