youtubebeat/vendor/github.com/elastic/beats/metricbeat/module/zookeeper/zookeeper.go

62 lines
1.9 KiB
Go

// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. 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 zookeeper is a Metricbeat module for ZooKeeper servers.
*/
package zookeeper
import (
"bytes"
"io"
"io/ioutil"
"net"
"time"
"github.com/pkg/errors"
)
// RunCommand establishes a TCP connection the ZooKeeper command port that
// accepts the four-letter ZooKeeper commands and sends the given command. It
// reads all response data received on the socket and returns an io.Reader
// containing that data.
func RunCommand(command, address string, timeout time.Duration) (io.Reader, error) {
conn, err := net.DialTimeout("tcp", address, timeout)
if err != nil {
return nil, errors.Wrapf(err, "connection to host '%s' failed", address)
}
defer conn.Close()
// Set read and write timeout.
err = conn.SetDeadline(time.Now().Add(timeout))
if err != nil {
return nil, err
}
// Write four-letter command.
_, err = conn.Write([]byte(command))
if err != nil {
return nil, errors.Wrapf(err, "writing command '%s' failed", command)
}
result, err := ioutil.ReadAll(conn)
if err != nil {
return nil, errors.Wrap(err, "read failed")
}
return bytes.NewReader(result), nil
}