133 lines
3 KiB
Go
133 lines
3 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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package munin
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"strconv"
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"strings"
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"time"
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"github.com/joeshaw/multierror"
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"github.com/pkg/errors"
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"github.com/elastic/beats/libbeat/common"
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)
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const (
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unknownValue = "U"
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)
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// Node connection
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type Node struct {
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conn net.Conn
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writer io.Writer
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reader *bufio.Reader
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}
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// Connect with a munin node
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func Connect(address string, timeout time.Duration) (*Node, 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, err
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}
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n := &Node{conn: conn,
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writer: conn,
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reader: bufio.NewReader(conn),
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}
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// Consume and ignore first line returned by munin, it is a comment
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// about the node
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scanner := bufio.NewScanner(n.reader)
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scanner.Scan()
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return n, scanner.Err()
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}
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// Close node connection releasing its resources
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func (n *Node) Close() error {
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return n.conn.Close()
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}
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// List of items exposed by the node
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func (n *Node) List() ([]string, error) {
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_, err := io.WriteString(n.writer, "list\n")
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if err != nil {
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return nil, err
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}
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scanner := bufio.NewScanner(n.reader)
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scanner.Scan()
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return strings.Fields(scanner.Text()), scanner.Err()
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}
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// Fetch metrics from munin node
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func (n *Node) Fetch(items ...string) (common.MapStr, error) {
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var errs multierror.Errors
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event := common.MapStr{}
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for _, item := range items {
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_, err := io.WriteString(n.writer, "fetch "+item+"\n")
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if err != nil {
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errs = append(errs, err)
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continue
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}
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scanner := bufio.NewScanner(n.reader)
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scanner.Split(bufio.ScanWords)
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for scanner.Scan() {
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name := strings.TrimSpace(scanner.Text())
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// Munin delimits metrics with a dot
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if name == "." {
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break
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}
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name = strings.TrimSuffix(name, ".value")
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if !scanner.Scan() {
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if scanner.Err() == nil {
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errs = append(errs, errors.New("unexpected EOF when expecting value"))
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}
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break
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}
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value := scanner.Text()
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key := fmt.Sprintf("%s.%s", item, name)
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if value == unknownValue {
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errs = append(errs, errors.Errorf("unknown value for %s", key))
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continue
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}
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if f, err := strconv.ParseFloat(value, 64); err == nil {
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event.Put(key, f)
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continue
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}
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event.Put(key, value)
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}
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if scanner.Err() != nil {
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errs = append(errs, scanner.Err())
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}
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}
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return event, errs.Err()
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}
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