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node_stats.go
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node_stats.go
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// 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 node_stats
import (
"fmt"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/parse"
"github.com/elastic/beats/metricbeat/module/logstash"
)
// init registers the MetricSet with the central registry.
// The New method will be called after the setup of the module and before starting to fetch data
func init() {
mb.Registry.MustAddMetricSet(logstash.ModuleName, "node_stats", New,
mb.WithHostParser(hostParser),
mb.WithNamespace("logstash.node.stats"),
mb.DefaultMetricSet(),
)
}
const (
nodeStatsPath = "/_node/stats"
)
var (
hostParser = parse.URLHostParserBuilder{
DefaultScheme: "http",
PathConfigKey: "path",
DefaultPath: nodeStatsPath,
}.Build()
)
// MetricSet type defines all fields of the MetricSet
type MetricSet struct {
*logstash.MetricSet
}
// New create a new instance of the MetricSet
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
ms, err := logstash.NewMetricSet(base)
if err != nil {
return nil, err
}
if ms.XPack {
logstashVersion, err := logstash.GetVersion(ms)
if err != nil {
return nil, err
}
arePipelineGraphAPIsAvailable := logstash.ArePipelineGraphAPIsAvailable(logstashVersion)
if err != nil {
return nil, err
}
if !arePipelineGraphAPIsAvailable {
const errorMsg = "The %v metricset with X-Pack enabled is only supported with Logstash >= %v. You are currently running Logstash %v"
return nil, fmt.Errorf(errorMsg, ms.FullyQualifiedName(), logstash.PipelineGraphAPIsAvailableVersion, logstashVersion)
}
ms.HTTP.SetURI(ms.HTTP.GetURI() + "?vertices=true")
}
return &MetricSet{
ms,
}, nil
}
// Fetch methods implements the data gathering and data conversion to the right format
// It returns the event which is then forward to the output. In case of an error, a
// descriptive error must be returned.
func (m *MetricSet) Fetch(r mb.ReporterV2) error {
content, err := m.HTTP.FetchContent()
if err != nil {
if m.XPack {
m.Logger().Error(err)
return nil
}
return err
}
if !m.XPack {
return eventMapping(r, content)
}
err = eventMappingXPack(r, m, content)
if err != nil {
m.Logger().Error(err)
}
return nil
}