62 lines
1.9 KiB
Go
62 lines
1.9 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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/*
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Package zookeeper is a Metricbeat module for ZooKeeper servers.
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*/
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package zookeeper
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import (
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"bytes"
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"io"
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"io/ioutil"
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"net"
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"time"
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"github.com/pkg/errors"
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)
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// RunCommand establishes a TCP connection the ZooKeeper command port that
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// accepts the four-letter ZooKeeper commands and sends the given command. It
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// reads all response data received on the socket and returns an io.Reader
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// containing that data.
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func RunCommand(command, address string, timeout time.Duration) (io.Reader, error) {
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conn, err := net.DialTimeout("tcp", address, timeout)
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if err != nil {
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return nil, errors.Wrapf(err, "connection to host '%s' failed", address)
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}
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defer conn.Close()
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// Set read and write timeout.
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err = conn.SetDeadline(time.Now().Add(timeout))
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if err != nil {
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return nil, err
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}
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// Write four-letter command.
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_, err = conn.Write([]byte(command))
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if err != nil {
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return nil, errors.Wrapf(err, "writing command '%s' failed", command)
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}
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result, err := ioutil.ReadAll(conn)
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if err != nil {
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return nil, errors.Wrap(err, "read failed")
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}
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return bytes.NewReader(result), nil
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}
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