95 lines
2.8 KiB
Go
95 lines
2.8 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 node
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import (
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"time"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/libbeat/common/cfgwarn"
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"github.com/elastic/beats/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/module/munin"
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)
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// init registers the MetricSet with the central registry as soon as the program
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// starts. The New function will be called later to instantiate an instance of
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// the MetricSet for each host defined in the module's configuration. After the
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// MetricSet has been created then Fetch will begin to be called periodically.
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func init() {
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mb.Registry.MustAddMetricSet("munin", "node", New,
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mb.DefaultMetricSet(),
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)
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}
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// MetricSet holds any configuration or state information. It must implement
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// the mb.MetricSet interface. And this is best achieved by embedding
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// mb.BaseMetricSet because it implements all of the required mb.MetricSet
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// interface methods except for Fetch.
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type MetricSet struct {
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mb.BaseMetricSet
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namespace string
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timeout time.Duration
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}
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// New creates a new instance of the MetricSet. New is responsible for unpacking
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// any MetricSet specific configuration options if there are any.
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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cfgwarn.Beta("The munin node metricset is beta.")
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config := struct {
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Namespace string `config:"node.namespace" validate:"required"`
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}{}
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if err := base.Module().UnpackConfig(&config); err != nil {
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return nil, err
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}
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return &MetricSet{
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BaseMetricSet: base,
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namespace: config.Namespace,
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timeout: base.Module().Config().Timeout,
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}, nil
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}
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// Fetch method implements the data gathering
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func (m *MetricSet) Fetch() (common.MapStr, error) {
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node, err := munin.Connect(m.Host(), m.timeout)
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if err != nil {
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return nil, err
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}
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defer node.Close()
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items, err := node.List()
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if err != nil {
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return nil, err
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}
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event, err := node.Fetch(items...)
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if err != nil {
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return nil, err
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}
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// Set dynamic namespace.
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_, err = event.Put(mb.NamespaceKey, m.namespace)
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if err != nil {
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return nil, err
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}
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return event, nil
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}
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