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// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bufio"
"flag"
"fmt"
"os"
"strings"
sarama "gopkg.in/Shopify/sarama.v1"
)
const usage = `Usage: %s
Reads a list of newline separated messages from stdin and writes them to a single partition in kafka.
Arguments:
`
var (
brokerList = flag.String("brokers", os.Getenv("KAFKA_PEERS"), "The comma separated list of brokers in the Kafka cluster. You can also set the KAFKA_PEERS environment variable")
topic = flag.String("topic", "", "REQUIRED: the topic to produce to")
partition = flag.Int("partition", 0, "The partition to produce to. All the messages will be written to this partition.")
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
if *brokerList == "" {
fmt.Fprintln(os.Stderr, "no -brokers specified. Alternatively, set the KAFKA_PEERS environment variable")
os.Exit(1)
}
if *topic == "" {
fmt.Fprintln(os.Stderr, "no -topic specified")
os.Exit(1)
}
config := sarama.NewConfig()
config.Producer.RequiredAcks = sarama.WaitForAll
config.Producer.Return.Successes = true
config.Producer.Partitioner = sarama.NewManualPartitioner
producer, err := sarama.NewSyncProducer(strings.Split(*brokerList, ","), config)
if err != nil {
fmt.Fprintln(os.Stderr, "Failed to open Kafka producer:", err)
os.Exit(1)
}
defer func() {
if err := producer.Close(); err != nil {
fmt.Fprintln(os.Stderr, "Failed to close Kafka producer cleanly:", err)
}
}()
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Bytes()
message := &sarama.ProducerMessage{
Topic: *topic,
Partition: int32(*partition),
Value: sarama.ByteEncoder(line),
}
if _, _, err := producer.SendMessage(message); err != nil {
fmt.Fprintln(os.Stderr, "Failed to send message:", err)
os.Exit(1)
}
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "reading standard input:", err)
}
}
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