/
jar.go
74 lines (66 loc) · 2.21 KB
/
jar.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 kafka
import (
"fmt"
"net"
"os/exec"
"strconv"
"time"
)
// runLocalKafka takes a Kafka jar filepath and runs a local Kafka cluster with
// a timeout (via the timeout command), returning the bootstrap server. Requires
// an environment with the timeout command.
func runLocalKafka(jar string, timeout string) (*cluster, error) {
_, err := exec.LookPath("java")
if err != nil {
return nil, err
}
_, err = exec.LookPath("timeout")
if err != nil && len(timeout) != 0 {
return nil, fmt.Errorf("\"timeout\" required for kafka_jar_timeout flag: %s", err)
}
port, err := getOpenPort()
if err != nil {
return nil, err
}
kafkaPort := strconv.Itoa(port)
port, err = getOpenPort()
if err != nil {
return nil, err
}
zookeeperPort := strconv.Itoa(port)
var cmdArr []string
if len(timeout) != 0 {
cmdArr = append(cmdArr, "timeout", timeout)
}
cmdArr = append(cmdArr, "java", "-jar", jar, kafkaPort, zookeeperPort)
cmd := exec.Command(cmdArr[0], cmdArr[1:]...)
err = cmd.Start()
if err != nil {
return nil, err
}
time.Sleep(3 * time.Second) // Wait a bit for the cluster to start.
return &cluster{proc: cmd.Process, bootstrapAddr: "localhost:" + kafkaPort}, nil
}
// getOpenPort gets an open TCP port and returns it, or an error on failure.
func getOpenPort() (int, error) {
listener, err := net.Listen("tcp", ":0")
if err != nil {
return 0, err
}
defer listener.Close()
return listener.Addr().(*net.TCPAddr).Port, nil
}