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status.go
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status.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 status reads Apache HTTPD server status from the mod_status module.
package status
import (
"github.com/pkg/errors"
"github.com/elastic/beats/v7/libbeat/common/fleetmode"
"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"
)
const (
// defaultScheme is the default scheme to use when it is not specified in
// the host config.
defaultScheme = "http"
// defaultPath is the default path to the mod_status endpoint on the
// Apache HTTPD server.
defaultPath = "/server-status"
// autoQueryParam is a query parameter added to the request so that
// mod_status returns machine-readable output.
autoQueryParam = "auto"
)
var (
debugf = logp.MakeDebug("apache-status")
hostParser = parse.URLHostParserBuilder{
DefaultScheme: defaultScheme,
PathConfigKey: "server_status_path",
DefaultPath: defaultPath,
QueryParams: autoQueryParam,
}.Build()
)
func init() {
mb.Registry.MustAddMetricSet("apache", "status", New,
mb.WithHostParser(hostParser),
mb.DefaultMetricSet(),
)
}
// MetricSet for fetching Apache HTTPD server status.
type MetricSet struct {
mb.BaseMetricSet
http *helper.HTTP
isFleetMode bool
}
// New creates new instance of MetricSet.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
http, err := helper.NewHTTP(base)
if err != nil {
return nil, err
}
return &MetricSet{
base,
http,
fleetmode.Enabled(),
}, 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) error {
scanner, err := m.http.FetchScanner()
if err != nil {
return errors.Wrap(err, "error fetching data")
}
data, _ := eventMapping(scanner, m.Host())
event := mb.Event{
MetricSetFields: data,
}
if m.isFleetMode {
event = adjustFleetEvent(event)
}
if reported := reporter.Event(event); !reported {
m.Logger().Error("error reporting event")
}
return nil
}
func adjustFleetEvent(event mb.Event) mb.Event {
var adjusted mb.Event
adjusted.MetricSetFields = event.MetricSetFields.Clone()
// Convert apache.status.total_kbytes to apache.status.total_bytes
totalKBytes, err := adjusted.MetricSetFields.GetValue("total_kbytes")
if err == nil {
adjusted.MetricSetFields.Put("total_bytes", totalKBytes.(int64)*1024)
adjusted.MetricSetFields.Delete("total_kbytes")
}
// Remove apache.hostname
adjusted.MetricSetFields.Delete("hostname")
return adjusted
}