175 lines
4.3 KiB
Go
175 lines
4.3 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 heap
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import (
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"encoding/json"
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"runtime"
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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/libbeat/logp"
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"github.com/elastic/beats/metricbeat/helper"
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"github.com/elastic/beats/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/mb/parse"
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"github.com/elastic/beats/metricbeat/module/golang"
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)
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const (
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defaultScheme = "http"
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defaultPath = "/debug/vars"
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)
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var (
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hostParser = parse.URLHostParserBuilder{
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DefaultScheme: defaultScheme,
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DefaultPath: defaultPath,
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PathConfigKey: "heap.path",
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}.Build()
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)
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// init registers the MetricSet with the central registry.
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// The New method will be called after the setup of the module and before starting to fetch data
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func init() {
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if err := mb.Registry.AddMetricSet("golang", "heap", New, hostParser); err != nil {
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panic(err)
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}
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}
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// MetricSet type defines all fields of the MetricSet
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// As a minimum it must inherit the mb.BaseMetricSet fields, but can be extended with
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// additional entries. These variables can be used to persist data or configuration between
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// multiple fetch calls.
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type MetricSet struct {
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mb.BaseMetricSet
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http *helper.HTTP
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lastNumGC uint32
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}
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// New create a new instance of the MetricSet
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// Part of new is also setting up the configuration by processing additional
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// configuration entries if needed.
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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cfgwarn.Beta("The golang heap metricset is beta")
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http, err := helper.NewHTTP(base)
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if 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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http: http,
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}, nil
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}
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// Fetch methods implements the data gathering and data conversion to the right format
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// It returns the event which is then forward to the output. In case of an error, a
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// descriptive error must be returned.
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func (m *MetricSet) Fetch() (common.MapStr, error) {
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data, err := m.http.FetchContent()
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if err != nil {
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return nil, err
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}
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stats := struct {
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MemStats runtime.MemStats
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Cmdline []interface{}
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}{}
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err = json.Unmarshal(data, &stats)
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if err != nil {
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return nil, err
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}
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var event = common.MapStr{
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"cmdline": golang.GetCmdStr(stats.Cmdline),
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}
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ms := &stats.MemStats
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// add heap summary
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event["allocations"] = common.MapStr{
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"mallocs": ms.Mallocs,
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"frees": ms.Frees,
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"objects": ms.HeapObjects,
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// byte counters
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"total": ms.TotalAlloc,
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"allocated": ms.HeapAlloc,
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"idle": ms.HeapIdle,
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"active": ms.HeapInuse,
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}
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event["system"] = common.MapStr{
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"total": ms.Sys,
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"obtained": ms.HeapSys,
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"stack": ms.StackSys,
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"released": ms.HeapReleased,
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}
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// garbage collector summary
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var duration, maxDuration, avgDuration, count uint64
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// collect last gc run stats
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if m.lastNumGC < ms.NumGC {
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delta := ms.NumGC - m.lastNumGC
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start := m.lastNumGC
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if delta > 256 {
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logp.Debug("golang", "Missing %v gc cycles", delta-256)
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start = ms.NumGC - 256
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delta = 256
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}
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end := start + delta
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for i := start; i < end; i++ {
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idx := i % 256
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d := ms.PauseNs[idx]
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count++
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duration += d
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if d > maxDuration {
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maxDuration = d
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}
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}
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avgDuration = duration / count
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m.lastNumGC = ms.NumGC
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}
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event["gc"] = common.MapStr{
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"next_gc_limit": ms.NextGC,
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"total_count": ms.NumGC,
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"cpu_fraction": ms.GCCPUFraction,
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"total_pause": common.MapStr{
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"ns": ms.PauseTotalNs,
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},
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"pause": common.MapStr{
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"count": count,
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"sum": common.MapStr{
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"ns": duration,
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},
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"avg": common.MapStr{
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"ns": avgDuration,
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},
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"max": common.MapStr{
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"ns": maxDuration,
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},
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},
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}
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return event, nil
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}
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