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pod.go
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pod.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 pod
import (
"fmt"
"github.com/elastic/beats/v7/libbeat/common/kubernetes"
"github.com/elastic/beats/v7/libbeat/logp"
"github.com/elastic/beats/v7/metricbeat/helper"
"github.com/elastic/beats/v7/metricbeat/mb"
"github.com/elastic/beats/v7/metricbeat/mb/parse"
k8smod "github.com/elastic/beats/v7/metricbeat/module/kubernetes"
"github.com/elastic/beats/v7/metricbeat/module/kubernetes/util"
)
const (
defaultScheme = "http"
defaultPath = "/stats/summary"
)
var (
hostParser = parse.URLHostParserBuilder{
DefaultScheme: defaultScheme,
DefaultPath: defaultPath,
}.Build()
logger = logp.NewLogger("kubernetes.pod")
)
// 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("kubernetes", "pod", New,
mb.WithHostParser(hostParser),
mb.DefaultMetricSet(),
)
}
// MetricSet type defines all fields of the MetricSet
// As a minimum it must inherit the mb.BaseMetricSet fields, but can be extended with
// additional entries. These variables can be used to persist data or configuration between
// multiple fetch calls.
type MetricSet struct {
mb.BaseMetricSet
http *helper.HTTP
enricher util.Enricher
mod k8smod.Module
}
// New create a new instance of the MetricSet
// Part of new is also setting up the configuration by processing additional
// configuration entries if needed.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
http, err := helper.NewHTTP(base)
if err != nil {
return nil, err
}
mod, ok := base.Module().(k8smod.Module)
if !ok {
return nil, fmt.Errorf("must be child of kubernetes module")
}
return &MetricSet{
BaseMetricSet: base,
http: http,
enricher: util.NewResourceMetadataEnricher(base, &kubernetes.Pod{}, mod.GetMetricsRepo(), true),
mod: mod,
}, nil
}
// Fetch methods implements the data gathering and data conversion to the right
// format. It publishes the event which is then forwarded to the output. In case
// of an error set the Error field of mb.Event or simply call report.Error().
func (m *MetricSet) Fetch(reporter mb.ReporterV2) {
m.enricher.Start()
body, err := m.mod.GetKubeletStats(m.http)
if err != nil {
m.Logger().Error(err)
reporter.Error(err)
return
}
events, err := eventMapping(body, m.mod.GetMetricsRepo())
if err != nil {
m.Logger().Error(err)
reporter.Error(err)
return
}
m.enricher.Enrich(events)
for _, event := range events {
e, err := util.CreateEvent(event, "kubernetes.pod")
if err != nil {
m.Logger().Error(err)
}
if reported := reporter.Event(e); !reported {
m.Logger().Debug("error trying to emit event")
return
}
}
return
}
// Close stops this metricset
func (m *MetricSet) Close() error {
m.enricher.Stop()
return nil
}