memory.go

// 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.

//go:build darwin || freebsd || linux || openbsd || windows || aix
// +build darwin freebsd linux openbsd windows aix

package memory

import (
	"github.com/pkg/errors"

	"github.com/elastic/beats/v7/libbeat/common"
	"github.com/elastic/beats/v7/libbeat/common/transform/typeconv"
	"github.com/elastic/beats/v7/libbeat/metric/system/resolve"
	metrics "github.com/elastic/beats/v7/metricbeat/internal/metrics/memory"
	"github.com/elastic/beats/v7/metricbeat/mb"
	"github.com/elastic/beats/v7/metricbeat/mb/parse"
)

func init() {
	mb.Registry.MustAddMetricSet("system", "memory", New,
		mb.WithHostParser(parse.EmptyHostParser),
		mb.DefaultMetricSet(),
	)
}

// MetricSet for fetching system memory metrics.
type MetricSet struct {
	mb.BaseMetricSet
	mod resolve.Resolver
}

// New is a mb.MetricSetFactory that returns a memory.MetricSet.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
	sys := base.Module().(resolve.Resolver)
	return &MetricSet{BaseMetricSet: base, mod: sys}, nil
}

// Fetch fetches memory metrics from the OS.
func (m *MetricSet) Fetch(r mb.ReporterV2) error {

	eventRaw, err := metrics.Get(m.mod)
	if err != nil {
		return errors.Wrap(err, "error fetching memory metrics")
	}

	memory := common.MapStr{}
	err = typeconv.Convert(&memory, &eventRaw)

	r.Event(mb.Event{
		MetricSetFields: memory,
	})

	return nil
}